chore(release): bump version to 1.0.5

- Запускает тесты.
- Собирает приложение.
- Отправляет отладочную информацию в Sentry.
- Собирает и отправляет в реестр Docker image с приложением.
- Создаёт релиз со списком изменений и артефактами сборки.

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/release.yml

@@ -0,0 +1,169 @@
+name: release
+
+on:
+  push:
+    tags: [ "release/v*" ]
+
+permissions:
+  contents: write
+
+env:
+  CARGO_TERM_COLOR: always
+
+  BINARY_NAME: schedule-parser-rusted
+
+  TEST_DB: ${{ secrets.TEST_DATABASE_URL }}
+
+  SENTRY_AUTH_TOKEN: ${{ secrets.SENTRY_AUTH_TOKEN }}
+  SENTRY_ORG: ${{ secrets.SENTRY_ORG }}
+  SENTRY_PROJECT: ${{ secrets.SENTRY_PROJECT }}
+
+  DOCKER_IMAGE_NAME: ${{ github.repository }}
+
+  DOCKER_REGISTRY_HOST: registry.n08i40k.ru
+  DOCKER_REGISTRY_USERNAME: ${{ github.repository_owner }}
+  DOCKER_REGISTRY_PASSWORD: ${{ secrets.DOCKER_REGISTRY_PASSWORD }}
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup Rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1.11.0
+        with:
+          toolchain: stable
+
+      - name: Test
+        run: |
+          touch .env.test
+          cargo test --verbose
+        env:
+          DATABASE_URL: ${{ env.TEST_DB }}
+          JWT_SECRET: "test-secret-at-least-256-bits-used"
+          VKID_CLIENT_ID: 0
+          VKID_REDIRECT_URI: "vk0://vk.com/blank.html"
+          REQWEST_USER_AGENT: "Dalvik/2.1.0 (Linux; U; Android 6.0.1; OPPO R9s Build/MMB29M)"
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    needs: test
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup Rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1.11.0
+        with:
+          toolchain: stable
+
+      - name: Build
+        run: cargo build --release --verbose
+
+      - name: Extract debug symbols
+        run: |
+          objcopy --only-keep-debug target/release/${{ env.BINARY_NAME }}{,.d}
+          objcopy --strip-debug --strip-unneeded target/release/${{ env.BINARY_NAME }}
+          objcopy --add-gnu-debuglink target/release/${{ env.BINARY_NAME }}{.d,}
+
+      - name: Setup sentry-cli
+        uses: matbour/setup-sentry-cli@v2.0.0
+        with:
+          version: latest
+          token: ${{ env.SENTRY_AUTH_TOKEN }}
+          organization: ${{ env.SENTRY_ORG }}
+          project: ${{ env.SENTRY_PROJECT }}
+
+      - name: Upload debug symbols to Sentry
+        run: |
+          sentry-cli debug-files upload --include-sources .
+
+      - name: Upload build binary artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: release-binary
+          path: target/release/${{ env.BINARY_NAME }}
+
+      - name: Upload build debug symbols artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: release-symbols
+          path: target/release/${{ env.BINARY_NAME }}.d
+
+  docker:
+    name: Build & Push Docker Image
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Download build artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: release-binary
+
+      - name: Setup Docker Buildx
+        uses: docker/setup-buildx-action@v3.10.0
+
+      - name: Login to Registry
+        uses: docker/login-action@v3.4.0
+        with:
+          registry: ${{ env.DOCKER_REGISTRY_HOST }}
+          username: ${{ env.DOCKER_REGISTRY_USERNAME }}
+          password: ${{ env.DOCKER_REGISTRY_PASSWORD }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5.7.0
+        with:
+          images: ${{ env.DOCKER_REGISTRY_HOST }}/${{ env.DOCKER_IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@v6.15.0
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          build-args: |
+            "BINARY_NAME=${{ env.BINARY_NAME }}"
+  release:
+    name: Create GitHub Release
+    runs-on: ubuntu-latest
+    needs:
+      - build
+      - docker
+    # noinspection GrazieInspection,SpellCheckingInspection
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Generate changelog
+        run: |
+          LAST_TAG=$(git describe --tags --abbrev=0 HEAD^)
+          echo "## Коммиты с прошлого релиза $LAST_TAG" > CHANGELOG.md
+          git log $LAST_TAG..HEAD --oneline >> CHANGELOG.md
+
+      - name: Download build artifacts
+        uses: actions/download-artifact@v4
+        with:
+          pattern: release-*
+          merge-multiple: true
+
+      - name: Create Release
+        id: create_release
+        uses: ncipollo/release-action@v1.16.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          artifacts: "${{ env.BINARY_NAME }},${{ env.BINARY_NAME }}.d"
+          bodyFile: CHANGELOG.md

.github/workflows/test.yml

@@ -0,0 +1,32 @@
+name: cargo test
+
+on:
+  push:
+    branches: [ "master" ]
+    tags-ignore: [ "release/v*" ]
+
+permissions:
+  contents: read
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build
+        run: cargo build
+      - name: Create .env.test
+        run: touch .env.test
+      - name: Run tests
+        run: cargo test
+        env:
+          DATABASE_URL: ${{ secrets.TEST_DATABASE_URL }}
+          JWT_SECRET: "test-secret-at-least-256-bits-used"
+          VKID_CLIENT_ID: 0
+          VKID_REDIRECT_URI: "vk0://vk.com/blank.html"
+          REQWEST_USER_AGENT: "Dalvik/2.1.0 (Linux; U; Android 6.0.1; OPPO R9s Build/MMB29M)"

.gitignore

@@ -1,3 +1,7 @@
 /target
 .~*.xls
-schedule.json
+schedule.json
+teachers.json
+
+.env*
+/*-firebase-adminsdk-*.json

.idea/dataSources.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DataSourceManagerImpl" format="xml" multifile-model="true">
+    <data-source source="LOCAL" name="sp@localhost" uuid="28502a90-08bf-4cc0-8494-10dc74e37189">
+      <driver-ref>postgresql</driver-ref>
+      <synchronize>true</synchronize>
+      <jdbc-driver>org.postgresql.Driver</jdbc-driver>
+      <jdbc-url>jdbc:postgresql://localhost:5432/sp</jdbc-url>
+      <working-dir>$ProjectFileDir$</working-dir>
+    </data-source>
+  </component>
+</project>

.idea/discord.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DiscordProjectSettings">
+    <option name="show" value="PROJECT_FILES" />
+    <option name="description" value="" />
+    <option name="applicationTheme" value="default" />
+    <option name="iconsTheme" value="default" />
+    <option name="button1Title" value="" />
+    <option name="button1Url" value="" />
+    <option name="button2Title" value="" />
+    <option name="button2Url" value="" />
+    <option name="customApplicationId" value="" />
+  </component>
+</project>

.idea/schedule-parser-rusted.iml

@@ -2,10 +2,16 @@
 <module type="EMPTY_MODULE" version="4">
   <component name="NewModuleRootManager">
     <content url="file://$MODULE_DIR$">
-      <sourceFolder url="file://$MODULE_DIR$/lib/schedule_parser/benches" isTestSource="true" />
       <sourceFolder url="file://$MODULE_DIR$/lib/schedule_parser/src" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/actix-macros/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/actix-test/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/schedule-parser/benches" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/schedule-parser/src" isTestSource="false" />
+      <excludeFolder url="file://$MODULE_DIR$/actix-macros/target" />
+      <excludeFolder url="file://$MODULE_DIR$/actix-test/target" />
       <excludeFolder url="file://$MODULE_DIR$/target" />
+      <excludeFolder url="file://$MODULE_DIR$/.idea/dataSources" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />

CODE_OF_CONDUCT.md

@@ -0,0 +1,128 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official e-mail address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+email.
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series
+of actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or
+permanent ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior,  harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within
+the community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.0, available at
+https://www.contributor-covenant.org/version/2/0/code_of_conduct.html.
+
+Community Impact Guidelines were inspired by [Mozilla's code of conduct
+enforcement ladder](https://github.com/mozilla/diversity).
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see the FAQ at
+https://www.contributor-covenant.org/faq. Translations are available at
+https://www.contributor-covenant.org/translations.

Cargo.toml

@@ -1,15 +1,45 @@
 [workspace]
-members = ["lib/schedule_parser"]
+members = ["actix-macros", "actix-test", "schedule-parser"]
 
 [package]
 name = "schedule-parser-rusted"
-version = "0.1.0"
+version = "1.0.5"
 edition = "2024"
 publish = false
 
+[profile.release]
+debug = true
+
 [dependencies]
 actix-web = "4.10.2"
+actix-macros = { path = "actix-macros" }
+schedule-parser = { path = "schedule-parser", features = ["test-utils"] }
+bcrypt = "0.17.0"
+chrono = { version = "0.4.40", features = ["serde"] }
+derive_more = { version = "2", features = ["full"] }
+diesel = { version = "2.2.8", features = ["postgres"] }
+diesel-derive-enum = { git = "https://github.com/Havunen/diesel-derive-enum.git", features = ["postgres"] }
+dotenvy = "0.15.7"
+env_logger = "0.11.7"
+firebase-messaging-rs = { git = "https://github.com/i10416/firebase-messaging-rs.git" }
+futures-util = "0.3.31"
+jsonwebtoken = { version = "9.3.1", features = ["use_pem"] }
+hex = "0.4.3"
+mime = "0.3.17"
+objectid = "0.2.0"
+reqwest = { version = "0.12.15", features = ["json"] }
+sentry = "0.38"
+sentry-actix = "0.38"
 serde = { version = "1.0.219", features = ["derive"] }
-serde_repr = "0.1.20"
 serde_json = "1.0.140"
-schedule_parser = { path = "./lib/schedule_parser" }
+serde_with = "3.12.0"
+sha1 = "0.11.0-pre.5"
+tokio = { version = "1.44.1", features = ["macros", "rt-multi-thread"] }
+rand = "0.9.0"
+utoipa = { version = "5", features = ["actix_extras", "chrono"] }
+utoipa-rapidoc = { version = "6.0.0", features = ["actix-web"] }
+utoipa-actix-web = "0.1"
+uuid = { version = "1.16.0", features = ["v4"] }
+
+[dev-dependencies]
+actix-test = { path = "actix-test" }

Dockerfile

@@ -0,0 +1,14 @@
+FROM debian:stable-slim
+LABEL authors="n08i40k"
+
+ARG BINARY_NAME
+
+WORKDIR /app/
+
+RUN apt update && \
+    apt install -y libpq5 ca-certificates openssl
+
+COPY ./${BINARY_NAME} /bin/main
+RUN chmod +x /bin/main
+
+ENTRYPOINT ["main"]

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Nikita
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -0,0 +1,3 @@
+# API для получения расписания политехникума
+
+[![Rust](https://github.com/n08i40k/schedule-parser-rusted/actions/workflows/test.yml/badge.svg)](https://github.com/n08i40k/schedule-parser-rusted/actions/workflows/test.yml)

actix-macros/.gitignore

@@ -0,0 +1 @@
+/target

actix-macros/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "actix-utility-macros"
+version = "0.1.0"

actix-macros/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "actix-macros"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+syn = "2.0.100"
+quote = "1.0.40"
+proc-macro2 = "1.0.94"
+
+[lib]
+proc-macro = true

actix-macros/src/lib.rs

@@ -0,0 +1,209 @@
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+
+mod shared {
+    use quote::{ToTokens, quote};
+    use syn::{Attribute, DeriveInput};
+
+    pub fn find_status_code(attrs: &Vec<Attribute>) -> Option<proc_macro2::TokenStream> {
+        attrs
+            .iter()
+            .find_map(|attr| -> Option<proc_macro2::TokenStream> {
+                if !attr.path().is_ident("status_code") {
+                    return None;
+                }
+
+                let meta = attr.meta.require_name_value().ok()?;
+
+                let code = meta.value.to_token_stream().to_string();
+                let trimmed_code = code.trim_matches('"');
+
+                if let Ok(numeric_code) = trimmed_code.parse::<u16>() {
+                    Some(quote! { actix_web::http::StatusCode::from_u16(#numeric_code).unwrap() })
+                } else {
+                    let string_code: proc_macro2::TokenStream =
+                        trimmed_code.to_string().parse().unwrap();
+
+                    Some(quote! { #string_code })
+                }
+            })
+    }
+
+    pub fn get_arms(ast: &DeriveInput) -> Vec<proc_macro2::TokenStream> {
+        let name = &ast.ident;
+
+        let variants = if let syn::Data::Enum(data) = &ast.data {
+            &data.variants
+        } else {
+            panic!("Only enums are supported");
+        };
+
+        let mut status_code_arms: Vec<proc_macro2::TokenStream> = variants
+            .iter()
+            .map(|v| -> Option<proc_macro2::TokenStream> {
+                let status_code = find_status_code(&v.attrs)?;
+                let variant_name = &v.ident;
+
+                Some(quote! { #name::#variant_name => #status_code, })
+            })
+            .filter(|v| v.is_some())
+            .map(|v| v.unwrap())
+            .collect();
+
+        if status_code_arms.len() < variants.len() {
+            let status_code = find_status_code(&ast.attrs)
+                .unwrap_or_else(|| quote! { ::actix_web::http::StatusCode::INTERNAL_SERVER_ERROR });
+
+            status_code_arms.push(quote! { _ => #status_code });
+        }
+
+        status_code_arms
+    }
+}
+
+mod response_error_message {
+    use proc_macro::TokenStream;
+    use quote::quote;
+
+    pub fn fmt(ast: &syn::DeriveInput) -> TokenStream {
+        let name = &ast.ident;
+
+        let status_code_arms = super::shared::get_arms(ast);
+
+        TokenStream::from(quote! {
+            impl ::actix_web::ResponseError for #name {
+                fn status_code(&self) -> ::actix_web::http::StatusCode {
+                    match self {
+                        #(#status_code_arms)*
+                    }
+                }
+
+                fn error_response(&self) -> ::actix_web::HttpResponse<BoxBody> {
+                    ::actix_web::HttpResponse::build(self.status_code())
+                        .json(crate::utility::error::ResponseErrorMessage::new(self.clone()))
+                }
+            }
+        })
+    }
+}
+
+mod status_code {
+    use proc_macro::TokenStream;
+    use quote::quote;
+
+    pub fn fmt(ast: &syn::DeriveInput) -> TokenStream {
+        let name = &ast.ident;
+
+        let status_code_arms = super::shared::get_arms(ast);
+
+        TokenStream::from(quote! {
+            impl crate::routes::schema::PartialStatusCode for #name {
+                fn status_code(&self) -> ::actix_web::http::StatusCode {
+                    match self {
+                        #(#status_code_arms)*
+                    }
+                }
+            }
+        })
+    }
+}
+
+mod responder_json {
+    use proc_macro::TokenStream;
+    use quote::quote;
+
+    pub fn fmt(ast: &syn::DeriveInput) -> TokenStream {
+        let name = &ast.ident;
+
+        TokenStream::from(quote! {
+            impl ::actix_web::Responder for #name {
+                type Body = ::actix_web::body::EitherBody<::actix_web::body::BoxBody>;
+
+                fn respond_to(self, _: &::actix_web::HttpRequest) -> ::actix_web::HttpResponse<Self::Body> {
+                    ::actix_web::HttpResponse::Ok()
+                            .json(self)
+                            .map_into_left_body()
+                }
+            }
+        })
+    }
+}
+
+mod into_response_error {
+    use proc_macro::TokenStream;
+    use quote::quote;
+
+    pub fn fmt(ast: &syn::DeriveInput) -> TokenStream {
+        let name = &ast.ident;
+
+        TokenStream::from(quote! {
+            impl ::core::convert::Into<crate::routes::schema::ResponseError<#name>> for #name {
+                fn into(self) -> crate::routes::schema::ResponseError<#name> {
+                    crate::routes::schema::ResponseError {
+                        code: self,
+                        message: ::core::option::Option::None,
+                    }
+                }
+            }
+
+            impl<T> crate::routes::schema::IntoResponseAsError<T> for #name
+            where
+                T: ::serde::ser::Serialize + ::utoipa::PartialSchema {}
+        })
+    }
+
+    pub fn fmt_named(ast: &syn::DeriveInput) -> TokenStream {
+        let name = &ast.ident;
+
+        TokenStream::from(quote! {
+            impl ::core::convert::Into<crate::routes::schema::ResponseError<#name>> for #name {
+                fn into(self) -> crate::routes::schema::ResponseError<#name> {
+                    crate::routes::schema::ResponseError {
+                        message: ::core::option::Option::Some(format!("{}", self)),
+                        code: self,
+                    }
+                }
+            }
+
+            impl<T> crate::routes::schema::IntoResponseAsError<T> for #name
+            where
+                T: ::serde::ser::Serialize + ::utoipa::PartialSchema {}
+        })
+    }
+}
+
+#[proc_macro_derive(ResponseErrorMessage, attributes(status_code))]
+pub fn rem_derive(input: TokenStream) -> TokenStream {
+    let ast = syn::parse(input).unwrap();
+
+    response_error_message::fmt(&ast)
+}
+
+#[proc_macro_derive(ResponderJson)]
+pub fn responser_json_derive(input: TokenStream) -> TokenStream {
+    let ast = syn::parse(input).unwrap();
+
+    responder_json::fmt(&ast)
+}
+
+#[proc_macro_derive(IntoResponseError)]
+pub fn into_response_error_derive(input: TokenStream) -> TokenStream {
+    let ast = syn::parse(input).unwrap();
+
+    into_response_error::fmt(&ast)
+}
+
+#[proc_macro_derive(IntoResponseErrorNamed)]
+pub fn into_response_error_named_derive(input: TokenStream) -> TokenStream {
+    let ast = syn::parse(input).unwrap();
+
+    into_response_error::fmt_named(&ast)
+}
+
+#[proc_macro_derive(StatusCode, attributes(status_code))]
+pub fn status_code_derive(input: TokenStream) -> TokenStream {
+    let ast = syn::parse(input).unwrap();
+
+    status_code::fmt(&ast)
+}

actix-test/.gitignore

@@ -0,0 +1 @@
+/target

actix-test/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "actix-test"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+actix-http = "3.10.0"
+actix-web = "4.10.2"

actix-test/src/lib.rs

@@ -0,0 +1,12 @@
+use actix_web::dev::{HttpServiceFactory, Service, ServiceResponse};
+use actix_web::{App, test, web};
+
+pub async fn test_app<F, A: 'static>(
+    app_state: web::Data<A>,
+    factory: F,
+) -> impl Service<actix_http::Request, Response = ServiceResponse, Error = actix_web::Error>
+where
+    F: HttpServiceFactory + 'static,
+{
+    test::init_service(App::new().app_data(app_state).service(factory)).await
+}

diesel.toml

@@ -0,0 +1,9 @@
+# For documentation on how to configure this file,
+# see https://diesel.rs/guides/configuring-diesel-cli
+
+[print_schema]
+file = "src/database/schema.rs"
+custom_type_derives = ["diesel::query_builder::QueryId", "Clone"]
+
+[migrations_directory]
+dir = "./migrations"

lib/schedule_parser/Cargo.toml

@@ -1,23 +0,0 @@
-[package]
-name = "schedule_parser"
-version = "0.1.0"
-edition = "2024"
-
-[lib]
-name = "schedule_parser"
-path = "src/lib/lib.rs"
-
-[dependencies]
-serde = { version = "1.0.219", features = ["derive"] }
-serde_repr = "0.1.20"
-chrono = { version = "0.4.40", features = ["serde"] }
-calamine = "0.26.1"
-regex = "1.11.1"
-fuzzy-matcher = "0.3.7"
-
-[dev-dependencies]
-criterion = "0.5.1"
-
-[[bench]]
-name = "parse"
-harness = false

lib/schedule_parser/src/lib/lib.rs

@@ -1,627 +0,0 @@
-use crate::LessonParseResult::{Lessons, Street};
-use crate::schema::LessonType::Break;
-use crate::schema::{Day, Group, Lesson, LessonSubGroup, LessonTime, LessonType};
-use calamine::{Reader, Xls, open_workbook};
-use chrono::{Duration, NaiveDateTime};
-use fuzzy_matcher::FuzzyMatcher;
-use fuzzy_matcher::skim::SkimMatcherV2;
-use regex::Regex;
-use std::collections::HashMap;
-use std::path::Path;
-use std::sync::LazyLock;
-
-mod schema;
-
-struct InternalId {
-    /**
-     * Индекс строки
-     */
-    row: u32,
-
-    /**
-     * Индекс столбца
-     */
-    column: u32,
-
-    /**
-     * Текст в ячейке
-     */
-    name: String,
-}
-
-struct InternalTime {
-    /**
-     * Временной отрезок проведения пары
-     */
-    time_range: LessonTime,
-
-    /**
-     * Тип пары
-     */
-    lesson_type: LessonType,
-
-    /**
-     * Индекс пары
-     */
-    default_index: Option<u32>,
-
-    /**
-     * Рамка ячейки
-     */
-    xls_range: ((u32, u32), (u32, u32)),
-}
-
-type WorkSheet = calamine::Range<calamine::Data>;
-
-fn get_string_from_cell(worksheet: &WorkSheet, row: u32, col: u32) -> Option<String> {
-    let cell_data = if let Some(data) = worksheet.get((row as usize, col as usize)) {
-        data.to_string()
-    } else {
-        return None;
-    };
-
-    if cell_data.trim().is_empty() {
-        return None;
-    }
-
-    static NL_RE: LazyLock<Regex, fn() -> Regex> =
-        LazyLock::new(|| Regex::new(r"[\n\r]+").unwrap());
-    static SP_RE: LazyLock<Regex, fn() -> Regex> = LazyLock::new(|| Regex::new(r"\s+").unwrap());
-
-    let trimmed_data = SP_RE
-        .replace_all(&NL_RE.replace_all(&cell_data, " "), " ")
-        .trim()
-        .to_string();
-
-    if trimmed_data.is_empty() {
-        None
-    } else {
-        Some(trimmed_data)
-    }
-}
-
-fn get_merge_from_start(worksheet: &WorkSheet, row: u32, column: u32) -> ((u32, u32), (u32, u32)) {
-    let worksheet_end = worksheet.end().unwrap();
-
-    let row_end: u32 = {
-        let mut r: u32 = 0;
-
-        for _r in (row + 1)..worksheet_end.0 {
-            r = _r;
-
-            if let Some(_) = worksheet.get((_r as usize, column as usize)) {
-                break;
-            }
-        }
-
-        r
-    };
-
-    let column_end: u32 = {
-        let mut c: u32 = 0;
-
-        for _c in (column + 1)..worksheet_end.1 {
-            c = _c;
-
-            if let Some(_) = worksheet.get((row as usize, _c as usize)) {
-                break;
-            }
-        }
-
-        c
-    };
-
-    ((row, column), (row_end, column_end))
-}
-
-fn parse_skeleton(worksheet: &WorkSheet) -> (Vec<InternalId>, Vec<InternalId>) {
-    let range = &worksheet;
-
-    let mut is_parsed = false;
-
-    let mut groups: Vec<InternalId> = Vec::new();
-    let mut days: Vec<InternalId> = Vec::new();
-
-    let start = range.start().expect("Could not find start");
-    let end = range.end().expect("Could not find end");
-
-    let mut row = start.0;
-    while row < end.0 {
-        row += 1;
-
-        let day_name_opt = get_string_from_cell(&worksheet, row, 0);
-        if day_name_opt.is_none() {
-            continue;
-        }
-
-        let day_name = day_name_opt.unwrap();
-
-        if !is_parsed {
-            is_parsed = true;
-
-            row -= 1;
-
-            for column in (start.1 + 2)..=end.1 {
-                let group_name = get_string_from_cell(&worksheet, row, column);
-                if group_name.is_none() {
-                    continue;
-                }
-
-                groups.push(InternalId {
-                    row,
-                    column,
-                    name: group_name.unwrap(),
-                });
-            }
-
-            row += 1;
-        }
-
-        days.push(InternalId {
-            row,
-            column: 0,
-            name: day_name.clone(),
-        });
-
-        if days.len() > 2 && day_name.starts_with("Суббота") {
-            break;
-        }
-    }
-
-    (days, groups)
-}
-
-enum LessonParseResult {
-    Lessons(Vec<Lesson>),
-    Street(String),
-}
-
-trait StringInnerSlice {
-    fn inner_slice(&self, from: usize, to: usize) -> Self;
-}
-
-impl StringInnerSlice for String {
-    fn inner_slice(&self, from: usize, to: usize) -> Self {
-        self.chars()
-            .take(from)
-            .chain(self.chars().skip(to))
-            .collect()
-    }
-}
-
-fn guess_lesson_type(name: &String) -> Option<(String, LessonType)> {
-    let map: HashMap<String, LessonType> = HashMap::from([
-        ("(консультация)".to_string(), LessonType::Consultation),
-        (
-            "самостоятельная работа".to_string(),
-            LessonType::IndependentWork,
-        ),
-        ("зачет".to_string(), LessonType::Exam),
-        ("зачет с оценкой".to_string(), LessonType::ExamWithGrade),
-        ("экзамен".to_string(), LessonType::ExamDefault),
-    ]);
-
-    let matcher = SkimMatcherV2::default();
-    let name_lower = name.to_lowercase();
-
-    type SearchResult<'a> = (&'a LessonType, i64, Vec<usize>);
-
-    let mut search_results: Vec<SearchResult> = map
-        .iter()
-        .map(|entry| -> SearchResult {
-            if let Some((score, indices)) = matcher.fuzzy_indices(&*name_lower, entry.0) {
-                return (entry.1, score, indices);
-            }
-
-            (entry.1, 0, Vec::new())
-        })
-        .collect();
-    search_results.sort_by(|a, b| b.1.cmp(&a.1));
-
-    let guessed_type = search_results.first().unwrap();
-
-    if guessed_type.1 > 80 {
-        Some((
-            name.inner_slice(guessed_type.2[0], guessed_type.2[guessed_type.2.len() - 1]),
-            guessed_type.0.clone(),
-        ))
-    } else {
-        None
-    }
-}
-
-fn parse_lesson(
-    worksheet: &WorkSheet,
-    day: &mut Day,
-    day_times: &Vec<InternalTime>,
-    time: &InternalTime,
-    column: u32,
-) -> LessonParseResult {
-    let row = time.xls_range.0.0;
-
-    let (name, lesson_type) = {
-        let raw_name_opt = get_string_from_cell(&worksheet, row, column);
-        if raw_name_opt.is_none() {
-            return Lessons(Vec::new());
-        }
-
-        let raw_name = raw_name_opt.unwrap();
-
-        static OTHER_STREET_RE: LazyLock<Regex, fn() -> Regex> =
-            LazyLock::new(|| Regex::new(r"^[А-Я][а-я]+,?\s?[0-9]+$").unwrap());
-
-        if OTHER_STREET_RE.is_match(&raw_name) {
-            return Street(raw_name);
-        }
-
-        if let Some(guess) = guess_lesson_type(&raw_name) {
-            guess
-        } else {
-            (raw_name, time.lesson_type.clone())
-        }
-    };
-
-    let (default_range, lesson_time): (Option<[u8; 2]>, LessonTime) = {
-        // check if multi-lesson
-        let cell_range = get_merge_from_start(worksheet, row, column);
-
-        let end_time_arr = day_times
-            .iter()
-            .filter(|time| time.xls_range.1.0 == cell_range.1.0)
-            .collect::<Vec<&InternalTime>>();
-
-        let end_time = end_time_arr.first().expect("Unable to find lesson time!");
-
-        let range: Option<[u8; 2]> = if time.default_index != None {
-            let default = time.default_index.unwrap() as u8;
-            Some([default, end_time.default_index.unwrap() as u8])
-        } else {
-            None
-        };
-
-        let time = LessonTime {
-            start: time.time_range.start,
-            end: end_time.time_range.end,
-        };
-
-        (range, time)
-    };
-
-    let (name, mut subgroups) = parse_name_and_subgroups(&name);
-
-    {
-        let cabinets: Vec<String> = parse_cabinets(worksheet, row, column + 1);
-
-        // Если количество кабинетов равно 1, назначаем этот кабинет всем подгруппам
-        if cabinets.len() == 1 {
-            for subgroup in &mut subgroups {
-                subgroup.cabinet = Some(cabinets.get(0).or(Some(&String::new())).unwrap().clone())
-            }
-        }
-        // Если количество кабинетов совпадает с количеством подгрупп, назначаем кабинеты по порядку
-        else if cabinets.len() == subgroups.len() {
-            for subgroup in &mut subgroups {
-                subgroup.cabinet = Some(
-                    cabinets
-                        .get((subgroup.number - 1) as usize)
-                        .unwrap()
-                        .clone(),
-                );
-            }
-        }
-        // Если количество кабинетов больше количества подгрупп, делаем ещё одну подгруппу.
-        else if cabinets.len() > subgroups.len() {
-            for index in 0..subgroups.len() {
-                subgroups[index].cabinet = Some(cabinets[index].clone());
-            }
-
-            while cabinets.len() > subgroups.len() {
-                subgroups.push(LessonSubGroup {
-                    number: (subgroups.len() + 1) as u8,
-                    cabinet: Some(cabinets[subgroups.len()].clone()),
-                    teacher: "Ошибка в расписании".to_string(),
-                });
-            }
-        }
-        // Если кабинетов нет, но есть подгруппы, назначаем им значение "??"
-        else {
-            for subgroup in &mut subgroups {
-                subgroup.cabinet = Some("??".to_string());
-            }
-        }
-
-        cabinets
-    };
-
-    let lesson = Lesson {
-        lesson_type,
-        default_range,
-        name: Some(name),
-        time: lesson_time,
-        subgroups: Some(subgroups),
-        group: None,
-    };
-
-    let prev_lesson = if day.lessons.len() == 0 {
-        return Lessons(Vec::from([lesson]));
-    } else {
-        &day.lessons[day.lessons.len() - 1]
-    };
-
-    Lessons(Vec::from([
-        Lesson {
-            lesson_type: Break,
-            default_range: None,
-            name: None,
-            time: LessonTime {
-                start: prev_lesson.time.end,
-                end: lesson.time.start,
-            },
-            subgroups: Some(Vec::new()),
-            group: None,
-        },
-        lesson,
-    ]))
-}
-
-fn parse_cabinets(worksheet: &WorkSheet, row: u32, column: u32) -> Vec<String> {
-    let mut cabinets: Vec<String> = Vec::new();
-
-    if let Some(raw) = get_string_from_cell(&worksheet, row, column) {
-        let clean = raw.replace("\n", " ");
-        let parts: Vec<&str> = clean.split(" ").collect();
-
-        for part in parts {
-            let clean_part = part.to_string().trim().to_string();
-
-            cabinets.push(clean_part);
-        }
-    }
-
-    cabinets
-}
-
-fn parse_name_and_subgroups(name: &String) -> (String, Vec<LessonSubGroup>) {
-    static LESSON_RE: LazyLock<Regex, fn() -> Regex> =
-        LazyLock::new(|| Regex::new(r"(?:[А-Я][а-я]+[А-Я]{2}(?:\([0-9][а-я]+\))?)+$").unwrap());
-    static TEACHER_RE: LazyLock<Regex, fn() -> Regex> =
-        LazyLock::new(|| Regex::new(r"([А-Я][а-я]+)([А-Я])([А-Я])(?:\(([0-9])[а-я]+\))?").unwrap());
-    static CLEAN_RE: LazyLock<Regex, fn() -> Regex> =
-        LazyLock::new(|| Regex::new(r"[\s.,]+").unwrap());
-    static NAME_CLEAN_RE: LazyLock<Regex, fn() -> Regex> =
-        LazyLock::new(|| Regex::new(r"\.\s+$").unwrap());
-
-    let (teachers, lesson_name) = {
-        let clean_name = CLEAN_RE.replace_all(&name, "").to_string();
-
-        if let Some(captures) = LESSON_RE.captures(&clean_name) {
-            let capture = captures.get(0).unwrap();
-            let capture_str = capture.as_str().to_string();
-            let capture_name: String = capture_str.chars().take(5).collect();
-
-            (
-                NAME_CLEAN_RE.replace(&capture_str, "").to_string(),
-                name[0..name.find(&*capture_name).unwrap()].to_string(),
-            )
-        } else {
-            return (NAME_CLEAN_RE.replace(&name, "").to_string(), Vec::new());
-        }
-    };
-
-    let mut subgroups: Vec<LessonSubGroup> = Vec::new();
-
-    let teacher_it = TEACHER_RE.captures_iter(&teachers);
-
-    for captures in teacher_it {
-        subgroups.push(LessonSubGroup {
-            number: if let Some(capture) = captures.get(4) {
-                capture
-                    .as_str()
-                    .to_string()
-                    .parse::<u8>()
-                    .expect("Unable to read subgroup index!")
-            } else {
-                0
-            },
-            cabinet: None,
-            teacher: format!(
-                "{} {}.{}.",
-                captures.get(1).unwrap().as_str().to_string(),
-                captures.get(2).unwrap().as_str().to_string(),
-                captures.get(3).unwrap().as_str().to_string()
-            ),
-        })
-    }
-
-    // фикс, если у кого-то отсутствует индекс подгруппы
-
-    if subgroups.len() == 1 {
-        let index = subgroups[0].number;
-
-        if index == 0 {
-            subgroups[0].number = 1u8;
-        } else {
-            subgroups.push(LessonSubGroup {
-                number: if index == 1 { 2 } else { 1 },
-                cabinet: None,
-                teacher: "Только у другой".to_string(),
-            });
-        }
-    } else if subgroups.len() == 2 {
-        // если индексы отсутствуют у обоих, ставим поочерёдно
-        if subgroups[0].number == 0 && subgroups[1].number == 0 {
-            subgroups[0].number = 1;
-            subgroups[1].number = 2;
-        }
-        // если индекс отсутствует у первого, ставим 2, если у второго индекс 1 и наоборот
-        else if subgroups[0].number == 0 {
-            subgroups[0].number = if subgroups[1].number == 1 { 2 } else { 1 };
-        }
-        // если индекс отсутствует у второго, ставим 2, если у первого индекс 1 и наоборот
-        else if subgroups[1].number == 0 {
-            subgroups[1].number = if subgroups[0].number == 1 { 2 } else { 1 };
-        }
-    }
-
-    if subgroups.len() == 2 && subgroups[0].number == 2 && subgroups[1].number == 1 {
-        subgroups.reverse()
-    }
-
-    (lesson_name, subgroups)
-}
-
-pub fn parse_xls(path: &Path) -> HashMap<String, Group> {
-    let mut workbook: Xls<_> = open_workbook(path).expect("Can't open workbook");
-
-    let worksheet: WorkSheet = workbook
-        .worksheets()
-        .first()
-        .expect("No worksheet found")
-        .1
-        .to_owned();
-
-    let (days_markup, groups_markup) = parse_skeleton(&worksheet);
-
-    let mut groups: HashMap<String, Group> = HashMap::new();
-    let mut days_times: Vec<Vec<InternalTime>> = Vec::new();
-
-    let saturday_end_row = worksheet.end().unwrap().0;
-
-    for group_markup in groups_markup {
-        let mut group = Group {
-            name: group_markup.name,
-            days: Vec::new(),
-        };
-
-        for day_index in 0..(&days_markup).len() {
-            let day_markup = &days_markup[day_index];
-
-            let mut day = {
-                let space_index = day_markup.name.find(' ').unwrap();
-
-                let name = day_markup.name[..space_index].to_string();
-
-                let date_raw = day_markup.name[space_index + 1..].to_string();
-                let date_add = format!("{} 00:00:00", date_raw);
-
-                let date = NaiveDateTime::parse_from_str(&*date_add, "%d.%m.%Y %H:%M:%S");
-
-                Day {
-                    name,
-                    street: None,
-                    date: date.unwrap().and_utc(),
-                    lessons: Vec::new(),
-                }
-            };
-
-            let lesson_time_column = days_markup[0].column + 1;
-
-            let row_distance = if day_index != days_markup.len() - 1 {
-                days_markup[day_index + 1].row
-            } else {
-                saturday_end_row
-            } - day_markup.row;
-
-            if days_times.len() != 6 {
-                let mut day_times: Vec<InternalTime> = Vec::new();
-
-                for row in day_markup.row..(day_markup.row + row_distance) {
-                    // time
-                    let time_opt = get_string_from_cell(&worksheet, row, lesson_time_column);
-                    if time_opt.is_none() {
-                        continue;
-                    }
-
-                    let time = time_opt.unwrap();
-
-                    // type
-                    let lesson_type = if time.contains("пара") {
-                        LessonType::Default
-                    } else {
-                        LessonType::Additional
-                    };
-
-                    // lesson index
-                    let default_index = if lesson_type == LessonType::Default {
-                        Some(
-                            time.chars()
-                                .next()
-                                .unwrap()
-                                .to_string()
-                                .parse::<u32>()
-                                .unwrap(),
-                        )
-                    } else {
-                        None
-                    };
-
-                    // time
-                    let time_range = {
-                        static TIME_RE: LazyLock<Regex, fn() -> Regex> =
-                            LazyLock::new(|| Regex::new(r"(\d+\.\d+)-(\d+\.\d+)").unwrap());
-
-                        let parse_res = TIME_RE
-                            .captures(&time)
-                            .expect("Unable to obtain lesson start and end!");
-
-                        let start_match = parse_res.get(1).unwrap().as_str();
-                        let start_parts: Vec<&str> = start_match.split(".").collect();
-
-                        let end_match = parse_res.get(2).unwrap().as_str();
-                        let end_parts: Vec<&str> = end_match.split(".").collect();
-
-                        LessonTime {
-                            start: day.date.clone()
-                                + Duration::hours(start_parts[0].parse().unwrap())
-                                + Duration::minutes(start_parts[1].parse().unwrap()),
-                            end: day.date.clone()
-                                + Duration::hours(end_parts[0].parse().unwrap())
-                                + Duration::minutes(end_parts[1].parse().unwrap()),
-                        }
-                    };
-
-                    day_times.push(InternalTime {
-                        time_range,
-                        lesson_type,
-                        default_index,
-                        xls_range: get_merge_from_start(&worksheet, row, lesson_time_column),
-                    });
-                }
-
-                days_times.push(day_times);
-            }
-
-            let day_times = &days_times[day_index];
-
-            for time in day_times {
-                match &mut parse_lesson(
-                    &worksheet,
-                    &mut day,
-                    &day_times,
-                    &time,
-                    group_markup.column,
-                ) {
-                    Lessons(l) => day.lessons.append(l),
-                    Street(s) => day.street = Some(s.to_owned()),
-                }
-            }
-
-            group.days.push(day);
-        }
-
-        groups.insert(group.name.clone(), group);
-    }
-
-    groups
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = parse_xls(Path::new("../../schedule.xls"));
-        assert_ne!(result.len(), 0);
-    }
-}

lib/schedule_parser/src/lib/schema.rs

@@ -1,97 +0,0 @@
-use chrono::{DateTime, Utc};
-use serde::{Deserialize, Serialize};
-use std::collections::HashMap;
-use serde_repr::{Deserialize_repr, Serialize_repr};
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct LessonTime {
-    pub start: DateTime<Utc>,
-    pub end: DateTime<Utc>,
-}
-
-#[derive(Serialize_repr, Deserialize_repr, Debug, PartialEq, Clone)]
-#[repr(u8)]
-pub enum LessonType {
-    Default = 0,     // Обычная
-    Additional,      // Допы
-    Break,           // Перемена
-    Consultation,    // Консультация
-    IndependentWork, // Самостоятельная работа
-    Exam,            // Зачёт
-    ExamWithGrade,   // Зачет с оценкой
-    ExamDefault,     // Экзамен
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct LessonSubGroup {
-    pub number: u8,
-
-    pub cabinet: Option<String>,
-
-    pub teacher: String,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct Lesson {
-    /**
-     * Тип занятия
-     */
-    #[serde(rename = "type")]
-    pub lesson_type: LessonType,
-
-    /**
-     * Индексы пар, если присутствуют
-     */
-    #[serde(rename = "defaultRange")]
-    pub default_range: Option<[u8; 2]>,
-
-    /**
-     * Название занятия
-     */
-    pub name: Option<String>,
-
-    /**
-     * Начало и конец занятия
-     */
-    pub time: LessonTime,
-
-    /**
-     * Подгруппы
-     */
-    #[serde(rename = "subGroups")]
-    pub subgroups: Option<Vec<LessonSubGroup>>,
-
-    /**
-     * Группа (только для расписания преподавателей)
-     */
-    pub group: Option<String>,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct Day {
-    pub name: String,
-
-    pub street: Option<String>,
-
-    pub date: DateTime<Utc>,
-
-    pub lessons: Vec<Lesson>,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct Group {
-    pub name: String,
-
-    pub days: Vec<Day>,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct Schedule {
-    #[serde(rename = "updatedAt")]
-    pub updated_at: DateTime<Utc>,
-
-    pub groups: HashMap<String, Group>,
-
-    #[serde(rename = "updatedGroups")]
-    pub updated_groups: Vec<Vec<usize>>,
-}

migrations/00000000000000_diesel_initial_setup/down.sql

@@ -0,0 +1,6 @@
+-- This file was automatically created by Diesel to set up helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+DROP FUNCTION IF EXISTS diesel_manage_updated_at(_tbl regclass);
+DROP FUNCTION IF EXISTS diesel_set_updated_at();

migrations/00000000000000_diesel_initial_setup/up.sql

@@ -0,0 +1,36 @@
+-- This file was automatically created by Diesel to set up helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+
+
+
+-- Sets up a trigger for the given table to automatically set a column called
+-- `updated_at` whenever the row is modified (unless `updated_at` was included
+-- in the modified columns)
+--
+-- # Example
+--
+-- ```sql
+-- CREATE TABLE users (id SERIAL PRIMARY KEY, updated_at TIMESTAMP NOT NULL DEFAULT NOW());
+--
+-- SELECT diesel_manage_updated_at('users');
+-- ```
+CREATE OR REPLACE FUNCTION diesel_manage_updated_at(_tbl regclass) RETURNS VOID AS $$
+BEGIN
+    EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s
+                    FOR EACH ROW EXECUTE PROCEDURE diesel_set_updated_at()', _tbl);
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION diesel_set_updated_at() RETURNS trigger AS $$
+BEGIN
+    IF (
+        NEW IS DISTINCT FROM OLD AND
+        NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at
+    ) THEN
+        NEW.updated_at := current_timestamp;
+    END IF;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;

migrations/2025-03-21-211822_create_user_role/down.sql

@@ -0,0 +1 @@
+DROP TYPE user_role;

migrations/2025-03-21-211822_create_user_role/up.sql

@@ -0,0 +1,4 @@
+CREATE TYPE user_role AS ENUM (
+    'STUDENT',
+    'TEACHER',
+    'ADMIN');

migrations/2025-03-21-212111_create_users/down.sql

@@ -0,0 +1 @@
+DROP TABLE users;

migrations/2025-03-21-212111_create_users/up.sql

@@ -0,0 +1,11 @@
+CREATE TABLE users
+(
+    id           text PRIMARY KEY NOT NULL,
+    username     text UNIQUE      NOT NULL,
+    password     text             NOT NULL,
+    vk_id        int4             NULL,
+    access_token text UNIQUE      NOT NULL,
+    "group"      text             NOT NULL,
+    role         user_role        NOT NULL,
+    version      text             NOT NULL
+);

migrations/2025-03-21-212723_create_fcm/down.sql

@@ -0,0 +1 @@
+DROP TABLE fcm;

migrations/2025-03-21-212723_create_fcm/up.sql

@@ -0,0 +1,6 @@
+CREATE TABLE fcm
+(
+    user_id text PRIMARY KEY NOT NULL REFERENCES users (id),
+    token   text             NOT NULL,
+    topics  text[]           NOT NULL CHECK ( array_position(topics, null) is null )
+);

schedule-parser/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "schedule-parser"
+version = "0.1.0"
+edition = "2024"
+
+[features]
+test-utils = []
+
+[dependencies]
+calamine = "0.26"
+chrono = { version = "0.4", features = ["serde"] }
+derive_more = { version = "2", features = ["full"] }
+serde = { version = "1.0.219", features = ["derive"] }
+serde_repr = "0.1.20"
+fuzzy-matcher = "0.3.7"
+regex = "1.11.1"
+utoipa = { version = "5", features = ["chrono"] }
+
+[dev-dependencies]
+criterion = "0.6"
+
+[[bench]]
+name = "parse"
+harness = false

schedule-parser/benches/parse.rs

@@ -1,11 +1,11 @@
 use criterion::{Criterion, criterion_group, criterion_main};
+
 use schedule_parser::parse_xls;
-use std::path::Path;
 
 pub fn bench_parse_xls(c: &mut Criterion) {
-    c.bench_function("parse_xls", |b| {
-        b.iter(|| parse_xls(Path::new("../../schedule.xls")))
-    });
+    let buffer: Vec<u8> = include_bytes!("../../schedule.xls").to_vec();
+
+    c.bench_function("parse_xls", |b| b.iter(|| parse_xls(&buffer).unwrap()));
 }
 
 criterion_group!(benches, bench_parse_xls);

schedule-parser/src/lib.rs

@@ -0,0 +1,794 @@
+use crate::LessonParseResult::{Lessons, Street};
+use crate::schema::LessonType::Break;
+use crate::schema::{
+    Day, ErrorCell, ErrorCellPos, Lesson, LessonBoundaries, LessonSubGroup, LessonType, ParseError,
+    ParseResult, ScheduleEntry,
+};
+use calamine::{Reader, Xls, open_workbook_from_rs};
+use chrono::{DateTime, Duration, NaiveDateTime, Utc};
+use fuzzy_matcher::FuzzyMatcher;
+use fuzzy_matcher::skim::SkimMatcherV2;
+use regex::Regex;
+use std::collections::HashMap;
+use std::io::Cursor;
+use std::ops::Deref;
+use std::sync::LazyLock;
+
+mod macros;
+pub mod schema;
+
+/// Data cell storing the group name.
+struct GroupCellInfo {
+    /// Column index.
+    column: u32,
+
+    /// Text in the cell.
+    name: String,
+}
+
+/// Data cell storing the line.
+struct DayCellInfo {
+    /// Line index.
+    row: u32,
+
+    /// Column index.
+    column: u32,
+
+    /// Day name.
+    name: String,
+
+    /// Date of the day.
+    date: DateTime<Utc>,
+}
+
+/// Data on the time of lessons from the second column of the schedule.
+struct BoundariesCellInfo {
+    /// Temporary segment of the lesson.
+    time_range: LessonBoundaries,
+
+    /// Type of lesson.
+    lesson_type: LessonType,
+
+    /// The lesson index.
+    default_index: Option<u32>,
+
+    /// The frame of the cell.
+    xls_range: ((u32, u32), (u32, u32)),
+}
+
+struct WorkSheet {
+    pub data: calamine::Range<calamine::Data>,
+    pub merges: Vec<calamine::Dimensions>,
+}
+
+impl Deref for WorkSheet {
+    type Target = calamine::Range<calamine::Data>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.data
+    }
+}
+
+/// Getting a line from the required cell.
+fn get_string_from_cell(worksheet: &WorkSheet, row: u32, col: u32) -> Option<String> {
+    let cell_data = if let Some(data) = worksheet.get((row as usize, col as usize)) {
+        data.to_string()
+    } else {
+        return None;
+    };
+
+    if cell_data.trim().is_empty() {
+        return None;
+    }
+
+    static NL_RE: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"[\n\r]+").unwrap());
+    static SP_RE: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"\s+").unwrap());
+
+    let trimmed_data = SP_RE
+        .replace_all(&NL_RE.replace_all(&cell_data, " "), " ")
+        .trim()
+        .to_string();
+
+    if trimmed_data.is_empty() {
+        None
+    } else {
+        Some(trimmed_data)
+    }
+}
+
+/// Obtaining the boundaries of the cell along its upper left coordinate.
+fn get_merge_from_start(worksheet: &WorkSheet, row: u32, column: u32) -> ((u32, u32), (u32, u32)) {
+    return match worksheet
+        .merges
+        .iter()
+        .find(|merge| merge.start.0 == row && merge.start.1 == column)
+    {
+        Some(merge) => (merge.start, (merge.end.0 + 1, merge.end.1 + 1)),
+        None => ((row, column), (row + 1, column + 1))
+    };
+}
+
+/// Obtaining a "skeleton" schedule from the working sheet.
+fn parse_skeleton(
+    worksheet: &WorkSheet,
+) -> Result<(Vec<DayCellInfo>, Vec<GroupCellInfo>), ParseError> {
+    let mut groups: Vec<GroupCellInfo> = Vec::new();
+    let mut days: Vec<DayCellInfo> = Vec::new();
+
+    let worksheet_start = worksheet.start().ok_or(ParseError::UnknownWorkSheetRange)?;
+    let worksheet_end = worksheet.end().ok_or(ParseError::UnknownWorkSheetRange)?;
+
+    let mut row = worksheet_start.0;
+
+    while row < worksheet_end.0 {
+        row += 1;
+
+        let day_full_name = or_continue!(get_string_from_cell(&worksheet, row, 0));
+
+        // parse groups row when days column will found
+        if groups.is_empty() {
+            // переход на предыдущую строку
+            row -= 1;
+
+            for column in (worksheet_start.1 + 2)..=worksheet_end.1 {
+                groups.push(GroupCellInfo {
+                    column,
+                    name: or_continue!(get_string_from_cell(&worksheet, row, column)),
+                });
+            }
+
+            // возврат на текущую строку
+            row += 1;
+        }
+
+        let (day_name, day_date) = {
+            let space_index = day_full_name.find(' ').unwrap();
+
+            let name = day_full_name[..space_index].to_string();
+
+            let date_raw = day_full_name[space_index + 1..].to_string();
+            let date_add = format!("{} 00:00:00", date_raw);
+
+            let date =
+                or_break!(NaiveDateTime::parse_from_str(&*date_add, "%d.%m.%Y %H:%M:%S").ok());
+
+            (name, date.and_utc())
+        };
+
+        days.push(DayCellInfo {
+            row,
+            column: 0,
+            name: day_name,
+            date: day_date,
+        });
+    }
+
+    Ok((days, groups))
+}
+
+/// The result of obtaining a lesson from the cell.
+enum LessonParseResult {
+    /// List of lessons long from one to two.
+    ///
+    /// The number of lessons will be equal to one if the couple is the first in the day,
+    /// otherwise the list from the change template and the lesson itself will be returned.
+    Lessons(Vec<Lesson>),
+
+    /// Street on which the Polytechnic Corps is located.
+    Street(String),
+}
+
+trait StringInnerSlice {
+    /// Obtaining a line from the line on the initial and final index.
+    fn inner_slice(&self, from: usize, to: usize) -> Self;
+}
+
+impl StringInnerSlice for String {
+    fn inner_slice(&self, from: usize, to: usize) -> Self {
+        self.chars()
+            .take(from)
+            .chain(self.chars().skip(to))
+            .collect()
+    }
+}
+
+// noinspection GrazieInspection
+/// Obtaining a non-standard type of lesson by name.
+fn guess_lesson_type(name: &String) -> Option<(String, LessonType)> {
+    let map: HashMap<String, LessonType> = HashMap::from([
+        ("(консультация)".to_string(), LessonType::Consultation),
+        (
+            "самостоятельная работа".to_string(),
+            LessonType::IndependentWork,
+        ),
+        ("зачет".to_string(), LessonType::Exam),
+        ("зачет с оценкой".to_string(), LessonType::ExamWithGrade),
+        ("экзамен".to_string(), LessonType::ExamDefault),
+    ]);
+
+    let matcher = SkimMatcherV2::default();
+    let name_lower = name.to_lowercase();
+
+    type SearchResult<'a> = (&'a LessonType, i64, Vec<usize>);
+
+    let mut search_results: Vec<SearchResult> = map
+        .iter()
+        .map(|entry| -> SearchResult {
+            if let Some((score, indices)) = matcher.fuzzy_indices(&*name_lower, entry.0) {
+                return (entry.1, score, indices);
+            }
+
+            (entry.1, 0, Vec::new())
+        })
+        .collect();
+    search_results.sort_by(|a, b| b.1.cmp(&a.1));
+
+    let guessed_type = search_results.first().unwrap();
+
+    if guessed_type.1 > 80 {
+        Some((
+            name.inner_slice(guessed_type.2[0], guessed_type.2[guessed_type.2.len() - 1]),
+            guessed_type.0.clone(),
+        ))
+    } else {
+        None
+    }
+}
+
+/// Getting a pair or street from a cell.
+fn parse_lesson(
+    worksheet: &WorkSheet,
+    day: &mut Day,
+    day_boundaries: &Vec<BoundariesCellInfo>,
+    lesson_boundaries: &BoundariesCellInfo,
+    column: u32,
+) -> Result<LessonParseResult, ParseError> {
+    let row = lesson_boundaries.xls_range.0.0;
+
+    let (name, lesson_type) = {
+        let full_name = match get_string_from_cell(&worksheet, row, column) {
+            Some(x) => x,
+            None => return Ok(Lessons(Vec::new())),
+        };
+
+        static OTHER_STREET_RE: LazyLock<Regex> =
+            LazyLock::new(|| Regex::new(r"^[А-Я][а-я]+,?\s?[0-9]+$").unwrap());
+
+        if OTHER_STREET_RE.is_match(&full_name) {
+            return Ok(Street(full_name));
+        }
+
+        match guess_lesson_type(&full_name) {
+            Some(x) => x,
+            None => (full_name, lesson_boundaries.lesson_type.clone()),
+        }
+    };
+
+    let (default_range, lesson_time) = {
+        let cell_range = get_merge_from_start(worksheet, row, column);
+        
+        let end_time_arr = day_boundaries
+            .iter()
+            .filter(|time| time.xls_range.1.0 == cell_range.1.0)
+            .collect::<Vec<&BoundariesCellInfo>>();
+
+        let end_time = end_time_arr
+            .first()
+            .ok_or(ParseError::LessonTimeNotFound(ErrorCellPos { row, column }))?;
+
+        let range: Option<[u8; 2]> = if lesson_boundaries.default_index != None {
+            let default = lesson_boundaries.default_index.unwrap() as u8;
+            Some([default, end_time.default_index.unwrap() as u8])
+        } else {
+            None
+        };
+
+        let time = LessonBoundaries {
+            start: lesson_boundaries.time_range.start,
+            end: end_time.time_range.end,
+        };
+
+        Ok((range, time))
+    }?;
+
+    let (name, mut subgroups) = parse_name_and_subgroups(&name)?;
+
+    {
+        let cabinets: Vec<String> = parse_cabinets(worksheet, row, column + 1);
+
+        match cabinets.len() {
+            // Если кабинетов нет, но есть подгруппы, назначаем им кабинет "??"
+            0 => {
+                for subgroup in &mut subgroups {
+                    subgroup.cabinet = Some("??".to_string());
+                }
+            }
+            // Назначаем этот кабинет всем подгруппам
+            1 => {
+                for subgroup in &mut subgroups {
+                    subgroup.cabinet =
+                        Some(cabinets.get(0).or(Some(&String::new())).unwrap().clone())
+                }
+            }
+            len => {
+                // Если количество кабинетов совпадает с количеством подгрупп, назначаем кабинеты по порядку
+                if len == subgroups.len() {
+                    for subgroup in &mut subgroups {
+                        subgroup.cabinet = Some(
+                            cabinets
+                                .get((subgroup.number - 1) as usize)
+                                .unwrap()
+                                .clone(),
+                        );
+                    }
+                // Если количество кабинетов больше количества подгрупп, делаем ещё одну подгруппу.
+                } else if len > subgroups.len() {
+                    for index in 0..subgroups.len() {
+                        subgroups[index].cabinet = Some(cabinets[index].clone());
+                    }
+
+                    while cabinets.len() > subgroups.len() {
+                        subgroups.push(LessonSubGroup {
+                            number: (subgroups.len() + 1) as u8,
+                            cabinet: Some(cabinets[subgroups.len()].clone()),
+                            teacher: "Ошибка в расписании".to_string(),
+                        });
+                    }
+                }
+            }
+        };
+    };
+
+    let lesson = Lesson {
+        lesson_type,
+        default_range,
+        name: Some(name),
+        time: lesson_time,
+        subgroups: Some(subgroups),
+        group: None,
+    };
+
+    let prev_lesson = if day.lessons.is_empty() {
+        return Ok(Lessons(Vec::from([lesson])));
+    } else {
+        &day.lessons[day.lessons.len() - 1]
+    };
+
+    Ok(Lessons(Vec::from([
+        Lesson {
+            lesson_type: Break,
+            default_range: None,
+            name: None,
+            time: LessonBoundaries {
+                start: prev_lesson.time.end,
+                end: lesson.time.start,
+            },
+            subgroups: Some(Vec::new()),
+            group: None,
+        },
+        lesson,
+    ])))
+}
+
+/// Obtaining a list of cabinets to the right of the lesson cell.
+fn parse_cabinets(worksheet: &WorkSheet, row: u32, column: u32) -> Vec<String> {
+    let mut cabinets: Vec<String> = Vec::new();
+
+    if let Some(raw) = get_string_from_cell(&worksheet, row, column) {
+        let clean = raw.replace("\n", " ");
+        let parts: Vec<&str> = clean.split(" ").collect();
+
+        for part in parts {
+            let clean_part = part.to_string().trim().to_string();
+
+            cabinets.push(clean_part);
+        }
+    }
+
+    cabinets
+}
+
+/// Getting the "pure" name of the lesson and list of teachers from the text of the lesson cell.
+fn parse_name_and_subgroups(name: &String) -> Result<(String, Vec<LessonSubGroup>), ParseError> {
+    static LESSON_RE: LazyLock<Regex> =
+        LazyLock::new(|| Regex::new(r"(?:[А-Я][а-я]+[А-Я]{2}(?:\([0-9][а-я]+\))?)+$").unwrap());
+    static TEACHER_RE: LazyLock<Regex> =
+        LazyLock::new(|| Regex::new(r"([А-Я][а-я]+)([А-Я])([А-Я])(?:\(([0-9])[а-я]+\))?").unwrap());
+    static CLEAN_RE: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"[\s.,]+").unwrap());
+    static END_CLEAN_RE: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"[.\s]+$").unwrap());
+
+    let (teachers, lesson_name) = {
+        let clean_name = CLEAN_RE.replace_all(&name, "").to_string();
+
+        if let Some(captures) = LESSON_RE.captures(&clean_name) {
+            let capture = captures.get(0).unwrap();
+            let capture_str = capture.as_str().to_string();
+            let capture_name: String = capture_str.chars().take(5).collect();
+
+            (
+                END_CLEAN_RE.replace(&capture_str, "").to_string(),
+                END_CLEAN_RE
+                    .replace(&name[0..name.find(&*capture_name).unwrap()], "")
+                    .to_string(),
+            )
+        } else {
+            return Ok((END_CLEAN_RE.replace(&name, "").to_string(), Vec::new()));
+        }
+    };
+
+    let mut subgroups: Vec<LessonSubGroup> = Vec::new();
+
+    let teacher_it = TEACHER_RE.captures_iter(&teachers);
+
+    for captures in teacher_it {
+        subgroups.push(LessonSubGroup {
+            number: match captures.get(4) {
+                Some(capture) => capture.as_str().to_string().parse::<u8>().unwrap(),
+                None => 0,
+            },
+            cabinet: None,
+            teacher: format!(
+                "{} {}.{}.",
+                captures.get(1).unwrap().as_str().to_string(),
+                captures.get(2).unwrap().as_str().to_string(),
+                captures.get(3).unwrap().as_str().to_string()
+            ),
+        });
+    }
+
+    // фикс, если у кого-то отсутствует индекс подгруппы
+
+    if subgroups.len() == 1 {
+        let index = subgroups[0].number;
+
+        if index == 0 {
+            subgroups[0].number = 1u8;
+        } else {
+            subgroups.push(LessonSubGroup {
+                number: if index == 1 { 2 } else { 1 },
+                cabinet: None,
+                teacher: "Только у другой".to_string(),
+            });
+        }
+    } else if subgroups.len() == 2 {
+        // если индексы отсутствуют у обоих, ставим поочерёдно
+        if subgroups[0].number == 0 && subgroups[1].number == 0 {
+            subgroups[0].number = 1;
+            subgroups[1].number = 2;
+        }
+        // если индекс отсутствует у первого, ставим 2, если у второго индекс 1 и наоборот
+        else if subgroups[0].number == 0 {
+            subgroups[0].number = if subgroups[1].number == 1 { 2 } else { 1 };
+        }
+        // если индекс отсутствует у второго, ставим 2, если у первого индекс 1 и наоборот
+        else if subgroups[1].number == 0 {
+            subgroups[1].number = if subgroups[0].number == 1 { 2 } else { 1 };
+        }
+    }
+
+    if subgroups.len() == 2 && subgroups[0].number == 2 && subgroups[1].number == 1 {
+        subgroups.reverse()
+    }
+
+    Ok((lesson_name, subgroups))
+}
+
+fn parse_lesson_boundaries_cell(
+    cell_data: &String,
+    date: DateTime<Utc>,
+) -> Option<LessonBoundaries> {
+    static TIME_RE: LazyLock<Regex> =
+        LazyLock::new(|| Regex::new(r"(\d+\.\d+)-(\d+\.\d+)").unwrap());
+
+    let parse_res = if let Some(captures) = TIME_RE.captures(cell_data) {
+        captures
+    } else {
+        return None;
+    };
+
+    let start_match = parse_res.get(1).unwrap().as_str();
+    let start_parts: Vec<&str> = start_match.split(".").collect();
+
+    let end_match = parse_res.get(2).unwrap().as_str();
+    let end_parts: Vec<&str> = end_match.split(".").collect();
+
+    static GET_TIME: fn(DateTime<Utc>, &Vec<&str>) -> DateTime<Utc> = |date, parts| {
+        date + Duration::hours(parts[0].parse::<i64>().unwrap() - 4)
+            + Duration::minutes(parts[1].parse::<i64>().unwrap())
+    };
+
+    Some(LessonBoundaries {
+        start: GET_TIME(date.clone(), &start_parts),
+        end: GET_TIME(date, &end_parts),
+    })
+}
+
+fn parse_day_boundaries_column(
+    worksheet: &WorkSheet,
+    day_markup: &DayCellInfo,
+    lesson_time_column: u32,
+    row_distance: u32,
+) -> Result<Vec<BoundariesCellInfo>, ParseError> {
+    let mut day_times: Vec<BoundariesCellInfo> = Vec::new();
+
+    for row in day_markup.row..(day_markup.row + row_distance) {
+        let time_cell = if let Some(str) = get_string_from_cell(&worksheet, row, lesson_time_column)
+        {
+            str
+        } else {
+            continue;
+        };
+
+        let lesson_time = parse_lesson_boundaries_cell(&time_cell, day_markup.date.clone()).ok_or(
+            ParseError::LessonBoundaries(ErrorCell::new(
+                row,
+                lesson_time_column,
+                time_cell.clone(),
+            )),
+        )?;
+
+        // type
+        let lesson_type = if time_cell.contains("пара") {
+            LessonType::Default
+        } else {
+            LessonType::Additional
+        };
+
+        // lesson index
+        let default_index = if lesson_type == LessonType::Default {
+            Some(
+                time_cell
+                    .chars()
+                    .next()
+                    .unwrap()
+                    .to_string()
+                    .parse::<u32>()
+                    .unwrap(),
+            )
+        } else {
+            None
+        };
+
+        day_times.push(BoundariesCellInfo {
+            time_range: lesson_time,
+            lesson_type,
+            default_index,
+            xls_range: get_merge_from_start(&worksheet, row, lesson_time_column),
+        });
+    }
+
+    return Ok(day_times);
+}
+
+fn parse_week_boundaries_column(
+    worksheet: &WorkSheet,
+    week_markup: &Vec<DayCellInfo>,
+) -> Result<Vec<Vec<BoundariesCellInfo>>, ParseError> {
+    let mut result: Vec<Vec<BoundariesCellInfo>> = Vec::new();
+
+    let worksheet_end_row = worksheet.end().unwrap().0;
+    let lesson_time_column = week_markup[0].column + 1;
+
+    for day_index in 0..week_markup.len() {
+        let day_markup = &week_markup[day_index];
+
+        // Если текущий день не последнему, то индекс строки следующего дня минус индекс строки текущего дня.
+        // Если текущий день - последний, то индекс последней строки документа минус индекс строки текущего дня.
+        let row_distance = if day_index != week_markup.len() - 1 {
+            week_markup[day_index + 1].row
+        } else {
+            worksheet_end_row
+        } - day_markup.row;
+
+        let day_boundaries =
+            parse_day_boundaries_column(&worksheet, day_markup, lesson_time_column, row_distance)?;
+
+        result.push(day_boundaries);
+    }
+
+    Ok(result)
+}
+
+/// Conversion of the list of couples of groups in the list of lessons of teachers.
+fn convert_groups_to_teachers(
+    groups: &HashMap<String, ScheduleEntry>,
+) -> HashMap<String, ScheduleEntry> {
+    let mut teachers: HashMap<String, ScheduleEntry> = HashMap::new();
+
+    let empty_days: Vec<Day> = groups
+        .values()
+        .next()
+        .unwrap()
+        .days
+        .iter()
+        .map(|day| Day {
+            name: day.name.clone(),
+            street: day.street.clone(),
+            date: day.date.clone(),
+            lessons: vec![],
+        })
+        .collect();
+
+    for group in groups.values() {
+        for (index, day) in group.days.iter().enumerate() {
+            for group_lesson in &day.lessons {
+                if group_lesson.lesson_type == Break {
+                    continue;
+                }
+
+                if group_lesson.subgroups.is_none() {
+                    continue;
+                }
+
+                let subgroups = group_lesson.subgroups.as_ref().unwrap();
+
+                for subgroup in subgroups {
+                    if subgroup.teacher == "Ошибка в расписании" {
+                        continue;
+                    }
+
+                    if !teachers.contains_key(&subgroup.teacher) {
+                        teachers.insert(
+                            subgroup.teacher.clone(),
+                            ScheduleEntry {
+                                name: subgroup.teacher.clone(),
+                                days: empty_days.to_vec(),
+                            },
+                        );
+                    }
+
+                    let teacher_day = teachers
+                        .get_mut(&subgroup.teacher)
+                        .unwrap()
+                        .days
+                        .get_mut(index)
+                        .unwrap();
+
+                    teacher_day.lessons.push({
+                        let mut lesson = group_lesson.clone();
+                        lesson.group = Some(group.name.clone());
+
+                        lesson
+                    });
+                }
+            }
+        }
+    }
+
+    teachers.iter_mut().for_each(|(_, teacher)| {
+        teacher.days.iter_mut().for_each(|day| {
+            day.lessons.sort_by(|a, b| {
+                a.default_range.as_ref().unwrap()[1].cmp(&b.default_range.as_ref().unwrap()[1])
+            })
+        })
+    });
+
+    teachers
+}
+
+/// Reading XLS Document from the buffer and converting it into the schedule ready to use.
+///
+/// # Arguments
+///
+/// * `buffer`: XLS data containing schedule.
+///
+/// returns: Result<ParseResult, ParseError>
+///
+/// # Examples
+///
+/// ```
+/// use schedule_parser::parse_xls;
+///
+/// let result = parse_xls(&include_bytes!("../../schedule.xls").to_vec());
+///
+/// assert!(result.is_ok(), "{}", result.err().unwrap());
+///
+/// assert_ne!(result.as_ref().unwrap().groups.len(), 0);
+/// assert_ne!(result.as_ref().unwrap().teachers.len(), 0);
+/// ```
+pub fn parse_xls(buffer: &Vec<u8>) -> Result<ParseResult, ParseError> {
+    let cursor = Cursor::new(&buffer);
+    let mut workbook: Xls<_> =
+        open_workbook_from_rs(cursor).map_err(|e| ParseError::BadXLS(std::sync::Arc::new(e)))?;
+
+    let worksheet = {
+        let (worksheet_name, worksheet) = workbook
+            .worksheets()
+            .first()
+            .ok_or(ParseError::NoWorkSheets)?
+            .clone();
+
+        let worksheet_merges = workbook
+            .worksheet_merge_cells(&*worksheet_name)
+            .ok_or(ParseError::NoWorkSheets)?;
+
+        WorkSheet {
+            data: worksheet,
+            merges: worksheet_merges,
+        }
+    };
+
+    let (week_markup, groups_markup) = parse_skeleton(&worksheet)?;
+    let week_boundaries = parse_week_boundaries_column(&worksheet, &week_markup)?;
+
+    let mut groups: HashMap<String, ScheduleEntry> = HashMap::new();
+
+    for group_markup in groups_markup {
+        let mut group = ScheduleEntry {
+            name: group_markup.name,
+            days: Vec::new(),
+        };
+
+        for day_index in 0..(&week_markup).len() {
+            let day_markup = &week_markup[day_index];
+
+            let mut day = Day {
+                name: day_markup.name.clone(),
+                street: None,
+                date: day_markup.date,
+                lessons: Vec::new(),
+            };
+
+            let day_boundaries = &week_boundaries[day_index];
+
+            for lesson_boundaries in day_boundaries {
+                match &mut parse_lesson(
+                    &worksheet,
+                    &mut day,
+                    &day_boundaries,
+                    &lesson_boundaries,
+                    group_markup.column,
+                )? {
+                    Lessons(lesson) => day.lessons.append(lesson),
+                    Street(street) => day.street = Some(street.to_owned()),
+                }
+            }
+
+            group.days.push(day);
+        }
+
+        groups.insert(group.name.clone(), group);
+    }
+
+    Ok(ParseResult {
+        teachers: convert_groups_to_teachers(&groups),
+        groups,
+    })
+}
+
+#[cfg(any(test, feature = "test-utils"))]
+pub mod test_utils {
+    use super::*;
+
+    pub fn test_result() -> Result<ParseResult, ParseError> {
+        parse_xls(&include_bytes!("../../schedule.xls").to_vec())
+    }
+}
+
+#[cfg(test)]
+pub mod tests {
+    #[test]
+    fn read() {
+        let result = super::test_utils::test_result();
+
+        assert!(result.is_ok(), "{}", result.err().unwrap());
+
+        assert_ne!(result.as_ref().unwrap().groups.len(), 0);
+        assert_ne!(result.as_ref().unwrap().teachers.len(), 0);
+    }
+
+    #[test]
+    fn test_split_lesson() {
+        let result = super::test_utils::test_result();
+        assert!(result.is_ok(), "{}", result.err().unwrap());
+
+        let result = result.unwrap();
+        assert!(result.groups.contains_key("ИС-214/23"));
+
+        let group = result.groups.get("ИС-214/23").unwrap();
+        let thursday = group.days.get(3).unwrap();
+
+        assert_eq!(thursday.lessons.len(), 1);
+        assert_eq!(thursday.lessons[0].default_range.unwrap()[1], 3);
+    }
+}

schedule-parser/src/macros.rs

@@ -0,0 +1,25 @@
+#[macro_export]
+macro_rules! or_continue {
+    ( $e:expr ) => {
+        {
+            if let Some(x) = $e {
+                x
+            } else {
+                continue;
+            }
+        }
+    }
+}
+
+#[macro_export]
+macro_rules! or_break {
+    ( $e:expr ) => {
+        {
+            if let Some(x) = $e {
+                x
+            } else {
+                break;
+            }
+        }
+    }
+}

schedule-parser/src/schema.rs

@@ -0,0 +1,180 @@
+use chrono::{DateTime, Utc};
+use derive_more::{Display, Error};
+use serde::{Deserialize, Serialize, Serializer};
+use serde_repr::{Deserialize_repr, Serialize_repr};
+use std::collections::HashMap;
+use std::sync::Arc;
+use utoipa::ToSchema;
+
+/// The beginning and end of the lesson.
+#[derive(Clone, Hash, Debug, Serialize, Deserialize, ToSchema)]
+pub struct LessonBoundaries {
+    /// The beginning of a lesson.
+    pub start: DateTime<Utc>,
+
+    /// The end of the lesson.
+    pub end: DateTime<Utc>,
+}
+
+/// Type of lesson.
+#[derive(Clone, Hash, PartialEq, Debug, Serialize_repr, Deserialize_repr, ToSchema)]
+#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+#[repr(u8)]
+pub enum LessonType {
+    /// Обычная.
+    Default = 0,
+
+    /// Допы.
+    Additional,
+
+    /// Перемена.
+    Break,
+
+    /// Консультация.
+    Consultation,
+
+    /// Самостоятельная работа.
+    IndependentWork,
+
+    /// Зачёт.
+    Exam,
+
+    /// Зачёт с оценкой.
+    ExamWithGrade,
+
+    /// Экзамен.
+    ExamDefault,
+}
+
+#[derive(Clone, Hash, Debug, Serialize, Deserialize, ToSchema)]
+pub struct LessonSubGroup {
+    /// Index of subgroup.
+    pub number: u8,
+
+    /// Cabinet, if present.
+    pub cabinet: Option<String>,
+
+    /// Full name of the teacher.
+    pub teacher: String,
+}
+
+#[derive(Clone, Hash, Debug, Serialize, Deserialize, ToSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct Lesson {
+    /// Type.
+    #[serde(rename = "type")]
+    pub lesson_type: LessonType,
+
+    /// Lesson indexes, if present.
+    pub default_range: Option<[u8; 2]>,
+
+    /// Name.
+    pub name: Option<String>,
+
+    /// The beginning and end.
+    pub time: LessonBoundaries,
+
+    /// List of subgroups.
+    #[serde(rename = "subGroups")]
+    pub subgroups: Option<Vec<LessonSubGroup>>,
+
+    /// Group name, if this is a schedule for teachers.
+    pub group: Option<String>,
+}
+
+#[derive(Clone, Hash, Debug, Serialize, Deserialize, ToSchema)]
+pub struct Day {
+    /// Day of the week.
+    pub name: String,
+
+    /// Address of another corps.
+    pub street: Option<String>,
+
+    /// Date.
+    pub date: DateTime<Utc>,
+
+    /// List of lessons on this day.
+    pub lessons: Vec<Lesson>,
+}
+
+#[derive(Clone, Hash, Debug, Serialize, Deserialize, ToSchema)]
+pub struct ScheduleEntry {
+    /// The name of the group or name of the teacher.
+    pub name: String,
+
+    /// List of six days.
+    pub days: Vec<Day>,
+}
+
+#[derive(Clone)]
+pub struct ParseResult {
+    /// List of groups.
+    pub groups: HashMap<String, ScheduleEntry>,
+
+    /// List of teachers.
+    pub teachers: HashMap<String, ScheduleEntry>,
+}
+
+#[derive(Clone, Debug, Display, Error, ToSchema)]
+#[display("row {row}, column {column}")]
+pub struct ErrorCellPos {
+    pub row: u32,
+    pub column: u32,
+}
+
+#[derive(Clone, Debug, Display, Error, ToSchema)]
+#[display("'{data}' at {pos}")]
+pub struct ErrorCell {
+    pub pos: ErrorCellPos,
+    pub data: String,
+}
+
+impl ErrorCell {
+    pub fn new(row: u32, column: u32, data: String) -> Self {
+        Self {
+            pos: ErrorCellPos { row, column },
+            data,
+        }
+    }
+}
+
+#[derive(Clone, Debug, Display, Error, ToSchema)]
+pub enum ParseError {
+    /// Errors related to reading XLS file.
+    #[display("{_0:?}: Failed to read XLS file.")]
+    #[schema(value_type = String)]
+    BadXLS(Arc<calamine::XlsError>),
+
+    /// Not a single sheet was found.
+    #[display("No work sheets found.")]
+    NoWorkSheets,
+
+    /// There are no data on the boundaries of the sheet.
+    #[display("There is no data on work sheet boundaries.")]
+    UnknownWorkSheetRange,
+
+    /// Failed to read the beginning and end of the lesson from the cell
+    #[display("Failed to read lesson start and end from {_0}.")]
+    LessonBoundaries(ErrorCell),
+
+    /// Not found the beginning and the end corresponding to the lesson.
+    #[display("No start and end times matching the lesson (at {_0}) was found.")]
+    LessonTimeNotFound(ErrorCellPos),
+}
+
+impl Serialize for ParseError {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match self {
+            ParseError::BadXLS(_) => serializer.serialize_str("BAD_XLS"),
+            ParseError::NoWorkSheets => serializer.serialize_str("NO_WORK_SHEETS"),
+            ParseError::UnknownWorkSheetRange => {
+                serializer.serialize_str("UNKNOWN_WORK_SHEET_RANGE")
+            }
+            ParseError::LessonBoundaries(_) => serializer.serialize_str("GLOBAL_TIME"),
+            ParseError::LessonTimeNotFound(_) => serializer.serialize_str("LESSON_TIME_NOT_FOUND"),
+        }
+    }
+}

src/app_state.rs

@@ -0,0 +1,88 @@
+use schedule_parser::schema::ParseResult;
+use crate::utility::hasher::DigestHasher;
+use crate::xls_downloader::basic_impl::BasicXlsDownloader;
+use actix_web::web;
+use chrono::{DateTime, Utc};
+use diesel::{Connection, PgConnection};
+use firebase_messaging_rs::FCMClient;
+use sha1::{Digest, Sha1};
+use std::env;
+use std::hash::Hash;
+use std::sync::Mutex;
+
+#[derive(Clone)]
+pub struct Schedule {
+    pub etag: String,
+    pub fetched_at: DateTime<Utc>,
+    pub updated_at: DateTime<Utc>,
+    pub parsed_at: DateTime<Utc>,
+    pub data: ParseResult,
+}
+
+#[derive(Clone)]
+pub struct VkId {
+    pub client_id: i32,
+    pub redirect_url: String,
+}
+
+impl VkId {
+    pub fn new() -> Self {
+        Self {
+            client_id: env::var("VKID_CLIENT_ID")
+                .expect("VKID_CLIENT_ID must be set")
+                .parse()
+                .expect("VKID_CLIENT_ID must be integer"),
+            redirect_url: env::var("VKID_REDIRECT_URI").expect("VKID_REDIRECT_URI must be set"),
+        }
+    }
+}
+
+impl Schedule {
+    pub fn hash(&self) -> String {
+        let mut hasher = DigestHasher::from(Sha1::new());
+
+        self.etag.hash(&mut hasher);
+
+        self.data.teachers.iter().for_each(|e| e.hash(&mut hasher));
+        self.data.groups.iter().for_each(|e| e.hash(&mut hasher));
+
+        hasher.finalize()
+    }
+}
+
+/// Common data provided to endpoints.
+pub struct AppState {
+    pub downloader: Mutex<BasicXlsDownloader>,
+    pub schedule: Mutex<Option<Schedule>>,
+    pub database: Mutex<PgConnection>,
+    pub vk_id: VkId,
+    pub fcm_client: Option<Mutex<FCMClient>>, // в рантайме не меняется, так что опционален мьютекс, а не данные в нём.
+}
+
+impl AppState {
+    pub async fn new() -> Self {
+        let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
+
+        Self {
+            downloader: Mutex::new(BasicXlsDownloader::new()),
+            schedule: Mutex::new(None),
+            database: Mutex::new(
+                PgConnection::establish(&database_url)
+                    .unwrap_or_else(|_| panic!("Error connecting to {}", database_url)),
+            ),
+            vk_id: VkId::new(),
+            fcm_client: if env::var("GOOGLE_APPLICATION_CREDENTIALS").is_ok() {
+                Some(Mutex::new(
+                    FCMClient::new().await.expect("FCM client must be created"),
+                ))
+            } else {
+                None
+            },
+        }
+    }
+}
+
+/// Create a new object web::Data<AppState>.
+pub async fn app_state() -> web::Data<AppState> {
+    web::Data::new(AppState::new().await)
+}

src/database/driver.rs

@@ -0,0 +1,163 @@
+pub mod users {
+    use crate::app_state::AppState;
+    use crate::database::models::User;
+    use crate::database::schema::users::dsl::users;
+    use crate::database::schema::users::dsl::*;
+    use crate::utility::mutex::MutexScope;
+    use actix_web::web;
+    use diesel::{ExpressionMethods, QueryResult, insert_into};
+    use diesel::{QueryDsl, RunQueryDsl};
+    use diesel::{SaveChangesDsl, SelectableHelper};
+
+    pub fn get(state: &web::Data<AppState>, _id: &String) -> QueryResult<User> {
+        state.database.scope(|conn| {
+            users
+                .filter(id.eq(_id))
+                .select(User::as_select())
+                .first(conn)
+        })
+    }
+
+    pub fn get_by_username(state: &web::Data<AppState>, _username: &String) -> QueryResult<User> {
+        state.database.scope(|conn| {
+            users
+                .filter(username.eq(_username))
+                .select(User::as_select())
+                .first(conn)
+        })
+    }
+
+    //noinspection RsTraitObligations
+    pub fn get_by_vk_id(state: &web::Data<AppState>, _vk_id: i32) -> QueryResult<User> {
+        state.database.scope(|conn| {
+            users
+                .filter(vk_id.eq(_vk_id))
+                .select(User::as_select())
+                .first(conn)
+        })
+    }
+
+    //noinspection DuplicatedCode
+    pub fn contains_by_username(state: &web::Data<AppState>, _username: &String) -> bool {
+        // и как это нахуй сократить блять примеров нихуя нет, нихуя не работает
+        // как меня этот раст заебал уже
+        state.database.scope(|conn| {
+            match users
+                .filter(username.eq(_username))
+                .count()
+                .get_result::<i64>(conn)
+            {
+                Ok(count) => count > 0,
+                Err(_) => false,
+            }
+        })
+    }
+
+    //noinspection DuplicatedCode
+    //noinspection RsTraitObligations
+    pub fn contains_by_vk_id(state: &web::Data<AppState>, _vk_id: i32) -> bool {
+        state.database.scope(|conn| {
+            match users
+                .filter(vk_id.eq(_vk_id))
+                .count()
+                .get_result::<i64>(conn)
+            {
+                Ok(count) => count > 0,
+                Err(_) => false,
+            }
+        })
+    }
+
+    pub fn insert(state: &web::Data<AppState>, user: &User) -> QueryResult<usize> {
+        state
+            .database
+            .scope(|conn| insert_into(users).values(user).execute(conn))
+    }
+
+    /// Function declaration [User::save][UserSave::save].
+    pub trait UserSave {
+        /// Saves the user's changes to the database.
+        ///
+        /// # Arguments
+        ///
+        /// * `state`: The state of the actix-web application that stores the mutex of the [connection][diesel::PgConnection].
+        ///
+        /// returns: `QueryResult<User>`
+        ///
+        /// # Examples
+        ///
+        /// ```
+        /// use crate::database::driver::users;
+        ///
+        /// #[derive(Deserialize)]
+        /// struct Params {
+        ///     pub username: String,
+        /// }
+        ///
+        /// #[patch("/")]
+        /// async fn patch_user(
+        ///     app_state: web::Data<AppState>,
+        ///     user: SyncExtractor<User>,
+        ///     web::Query(params): web::Query<Params>,
+        /// ) -> web::Json<User> {
+        ///     let mut user = user.into_inner();
+        ///
+        ///     user.username = params.username;
+        ///
+        ///     match user.save(&app_state) {
+        ///         Ok(user) => web::Json(user),
+        ///         Err(e) => {
+        ///             eprintln!("Failed to save user: {e}");
+        ///             panic!();
+        ///         }
+        ///     }
+        /// }
+        /// ```
+        fn save(&self, state: &web::Data<AppState>) -> QueryResult<User>;
+    }
+
+    /// Implementation of [UserSave][UserSave] trait.
+    impl UserSave for User {
+        fn save(&self, state: &web::Data<AppState>) -> QueryResult<User> {
+            state.database.scope(|conn| self.save_changes::<Self>(conn))
+        }
+    }
+
+    #[cfg(test)]
+    pub fn delete_by_username(state: &web::Data<AppState>, _username: &String) -> bool {
+        state.database.scope(|conn| {
+            match diesel::delete(users.filter(username.eq(_username))).execute(conn) {
+                Ok(count) => count > 0,
+                Err(_) => false,
+            }
+        })
+    }
+
+    #[cfg(test)]
+    pub fn insert_or_ignore(state: &web::Data<AppState>, user: &User) -> QueryResult<usize> {
+        state.database.scope(|conn| {
+            insert_into(users)
+                .values(user)
+                .on_conflict_do_nothing()
+                .execute(conn)
+        })
+    }
+}
+
+pub mod fcm {
+    use crate::app_state::AppState;
+    use crate::database::models::{FCM, User};
+    use crate::utility::mutex::MutexScope;
+    use actix_web::web;
+    use diesel::QueryDsl;
+    use diesel::RunQueryDsl;
+    use diesel::{BelongingToDsl, QueryResult, SelectableHelper};
+
+    pub fn from_user(state: &web::Data<AppState>, user: &User) -> QueryResult<FCM> {
+        state.database.scope(|conn| {
+            FCM::belonging_to(&user)
+                .select(FCM::as_select())
+                .get_result(conn)
+        })
+    }
+}

src/database/mod.rs

@@ -0,0 +1,3 @@
+pub mod schema;
+pub mod models;
+pub mod driver;

src/database/models.rs

@@ -0,0 +1,84 @@
+use actix_macros::ResponderJson;
+use diesel::QueryId;
+use diesel::prelude::*;
+use serde::{Deserialize, Serialize};
+use utoipa::ToSchema;
+
+#[derive(
+    Copy, Clone, PartialEq, Debug, Serialize, Deserialize, diesel_derive_enum::DbEnum, ToSchema,
+)]
+#[ExistingTypePath = "crate::database::schema::sql_types::UserRole"]
+#[DbValueStyle = "UPPERCASE"]
+#[serde(rename_all = "UPPERCASE")]
+pub enum UserRole {
+    Student,
+    Teacher,
+    Admin,
+}
+
+#[derive(
+    Identifiable,
+    AsChangeset,
+    Queryable,
+    QueryId,
+    Selectable,
+    Serialize,
+    Insertable,
+    Debug,
+    ToSchema,
+    ResponderJson,
+)]
+#[diesel(table_name = crate::database::schema::users)]
+#[diesel(treat_none_as_null = true)]
+pub struct User {
+    /// Account UUID.
+    pub id: String,
+
+    /// User name.
+    pub username: String,
+
+    /// BCrypt password hash.
+    pub password: String,
+
+    /// ID of the linked VK account.
+    pub vk_id: Option<i32>,
+
+    /// JWT access token.
+    pub access_token: String,
+
+    /// Group.
+    pub group: String,
+
+    /// Role.
+    pub role: UserRole,
+
+    /// Version of the installed Polytechnic+ application.
+    pub version: String,
+}
+
+#[derive(
+    Debug,
+    Clone,
+    Serialize,
+    Identifiable,
+    Queryable,
+    Selectable,
+    Insertable,
+    AsChangeset,
+    Associations,
+    ToSchema,
+    ResponderJson,
+)]
+#[diesel(belongs_to(User))]
+#[diesel(table_name = crate::database::schema::fcm)]
+#[diesel(primary_key(user_id))]
+pub struct FCM {
+    /// Account UUID.
+    pub user_id: String,
+
+    /// FCM token.
+    pub token: String,
+
+    /// List of topics subscribed to by the user.
+    pub topics: Vec<Option<String>>,
+}

src/database/schema.rs

@@ -0,0 +1,38 @@
+// @generated automatically by Diesel CLI.
+
+pub mod sql_types {
+    #[derive(diesel::query_builder::QueryId, Clone, diesel::sql_types::SqlType)]
+    #[diesel(postgres_type(name = "user_role"))]
+    pub struct UserRole;
+}
+
+diesel::table! {
+    fcm (user_id) {
+        user_id -> Text,
+        token -> Text,
+        topics -> Array<Nullable<Text>>,
+    }
+}
+
+diesel::table! {
+    use diesel::sql_types::*;
+    use super::sql_types::UserRole;
+
+    users (id) {
+        id -> Text,
+        username -> Text,
+        password -> Text,
+        vk_id -> Nullable<Int4>,
+        access_token -> Text,
+        group -> Text,
+        role -> UserRole,
+        version -> Text,
+    }
+}
+
+diesel::joinable!(fcm -> users (user_id));
+
+diesel::allow_tables_to_appear_in_same_query!(
+    fcm,
+    users,
+);

src/extractors/authorized_user.rs

@@ -0,0 +1,110 @@
+use crate::app_state::AppState;
+use crate::database::driver;
+use crate::database::models::{FCM, User};
+use crate::extractors::base::{FromRequestSync, SyncExtractor};
+use crate::utility::jwt;
+use actix_macros::ResponseErrorMessage;
+use actix_web::body::BoxBody;
+use actix_web::dev::Payload;
+use actix_web::http::header;
+use actix_web::{FromRequest, HttpRequest, web};
+use derive_more::Display;
+use serde::{Deserialize, Serialize};
+use std::fmt::Debug;
+
+#[derive(Clone, Debug, Serialize, Deserialize, Display, ResponseErrorMessage)]
+#[status_code = "actix_web::http::StatusCode::UNAUTHORIZED"]
+#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+pub enum Error {
+    /// There is no Authorization header in the request.
+    #[display("No Authorization header found")]
+    NoHeader,
+
+    /// Unknown authorization type other than Bearer.
+    #[display("Bearer token is required")]
+    UnknownAuthorizationType,
+
+    /// Invalid or expired access token.
+    #[display("Invalid or expired access token")]
+    InvalidAccessToken,
+
+    /// The user bound to the token is not found in the database.
+    #[display("No user associated with access token")]
+    NoUser,
+}
+
+impl Error {
+    pub fn into_err(self) -> actix_web::Error {
+        actix_web::Error::from(self)
+    }
+}
+
+/// User extractor from request with Bearer access token.
+impl FromRequestSync for User {
+    type Error = actix_web::Error;
+
+    fn from_request_sync(req: &HttpRequest, _: &mut Payload) -> Result<Self, Self::Error> {
+        let authorization = req
+            .headers()
+            .get(header::AUTHORIZATION)
+            .ok_or(Error::NoHeader.into_err())?
+            .to_str()
+            .map_err(|_| Error::NoHeader.into_err())?
+            .to_string();
+
+        let parts: Vec<&str> = authorization.split(' ').collect();
+
+        if parts.len() != 2 || parts[0] != "Bearer" {
+            return Err(Error::UnknownAuthorizationType.into_err());
+        }
+
+        let user_id = jwt::verify_and_decode(&parts[1].to_string())
+            .map_err(|_| Error::InvalidAccessToken.into_err())?;
+
+        let app_state = req.app_data::<web::Data<AppState>>().unwrap();
+
+        driver::users::get(&app_state, &user_id).map_err(|_| Error::NoUser.into())
+    }
+}
+
+pub struct UserExtractor<const FCM: bool> {
+    user: User,
+
+    fcm: Option<FCM>,
+}
+
+impl<const FCM: bool> UserExtractor<{ FCM }> {
+    pub fn user(&self) -> &User {
+        &self.user
+    }
+
+    pub fn fcm(&self) -> &Option<FCM> {
+        if !FCM {
+            panic!("FCM marked as not required, but it has been requested")
+        }
+
+        &self.fcm
+    }
+}
+
+/// Extractor of user and additional parameters from request with Bearer token.
+impl<const FCM: bool> FromRequestSync for UserExtractor<{ FCM }> {
+    type Error = actix_web::Error;
+
+    fn from_request_sync(req: &HttpRequest, payload: &mut Payload) -> Result<Self, Self::Error> {
+        let user = SyncExtractor::<User>::from_request(req, payload)
+            .into_inner()?
+            .into_inner();
+
+        let app_state = req.app_data::<web::Data<AppState>>().unwrap();
+
+        Ok(Self {
+            fcm: if FCM {
+                driver::fcm::from_user(&app_state, &user).ok()
+            } else {
+                None
+            },
+            user,
+        })
+    }
+}

src/extractors/base.rs

@@ -0,0 +1,151 @@
+use actix_web::dev::Payload;
+use actix_web::{FromRequest, HttpRequest};
+use futures_util::future::LocalBoxFuture;
+use std::future::{Ready, ready};
+use std::ops;
+
+/// # Async extractor.
+
+/// Asynchronous object extractor from a query.
+pub struct AsyncExtractor<T>(T);
+
+impl<T> AsyncExtractor<T> {
+    #[allow(dead_code)]
+    /// Retrieve the object extracted with the extractor.
+    pub fn into_inner(self) -> T {
+        self.0
+    }
+}
+
+impl<T> ops::Deref for AsyncExtractor<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl<T> ops::DerefMut for AsyncExtractor<T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+pub trait FromRequestAsync: Sized {
+    type Error: Into<actix_web::Error>;
+
+    /// Asynchronous function for extracting data from a query.
+    ///
+    /// returns: Result<Self, Self::Error>
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// struct User {
+    ///     pub id: String,
+    ///     pub username: String,
+    /// }
+    ///
+    /// // TODO: Я вообще этот экстрактор не использую, нахуя мне тогда писать пример, если я не ебу как его использовать. Я забыл.
+    ///
+    /// #[get("/")]
+    /// fn get_user_async(
+    ///     user: web::AsyncExtractor<User>,
+    /// ) -> web::Json<User> {
+    ///     let user = user.into_inner();    
+    ///
+    ///     web::Json(user)
+    /// }
+    /// ```
+    async fn from_request_async(req: HttpRequest, payload: Payload) -> Result<Self, Self::Error>;
+}
+
+impl<T: FromRequestAsync> FromRequest for AsyncExtractor<T> {
+    type Error = T::Error;
+    type Future = LocalBoxFuture<'static, Result<Self, Self::Error>>;
+
+    fn from_request(req: &HttpRequest, payload: &mut Payload) -> Self::Future {
+        let req = req.clone();
+        let payload = payload.take();
+        Box::pin(async move {
+            T::from_request_async(req, payload)
+                .await
+                .map(|res| Self(res))
+        })
+    }
+}
+
+/// # Sync extractor.
+
+/// Synchronous object extractor from a query.
+pub struct SyncExtractor<T>(T);
+
+impl<T> SyncExtractor<T> {
+    /// Retrieving an object extracted with the extractor.
+    pub fn into_inner(self) -> T {
+        self.0
+    }
+}
+
+impl<T> ops::Deref for SyncExtractor<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl<T> ops::DerefMut for SyncExtractor<T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+pub trait FromRequestSync: Sized {
+    type Error: Into<actix_web::Error>;
+
+    /// Synchronous function for extracting data from a query.
+    ///
+    /// returns: Result<Self, Self::Error>
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// struct User {
+    ///     pub id: String,
+    ///     pub username: String,
+    /// }
+    ///
+    /// impl FromRequestSync for User {
+    ///     type Error = actix_web::Error;
+    ///
+    ///     fn from_request_sync(req: &HttpRequest, _: &mut Payload) -> Result<Self, Self::Error> {
+    ///         // do magic here.
+    ///
+    ///         Ok(User {
+    ///             id: "qwerty".to_string(),
+    ///             username: "n08i40k".to_string()
+    ///         })
+    ///     }
+    /// }
+    ///
+    /// #[get("/")]
+    /// fn get_user_sync(
+    ///     user: web::SyncExtractor<User>,
+    /// ) -> web::Json<User> {
+    ///     let user = user.into_inner();    
+    ///
+    ///     web::Json(user)
+    /// }
+    /// ```
+    fn from_request_sync(req: &HttpRequest, payload: &mut Payload) -> Result<Self, Self::Error>;
+}
+
+impl<T: FromRequestSync> FromRequest for SyncExtractor<T> {
+    type Error = T::Error;
+    type Future = Ready<Result<Self, Self::Error>>;
+
+    fn from_request(req: &HttpRequest, payload: &mut Payload) -> Self::Future {
+        ready(T::from_request_sync(req, payload).map(|res| Self(res)))
+    }
+}

src/extractors/mod.rs

@@ -0,0 +1,2 @@
+pub mod authorized_user;
+pub mod base;

src/main.rs

@@ -1,15 +1,121 @@
-use std::fs;
-use std::path::Path;
-use schedule_parser::parse_xls;
+use crate::app_state::{AppState, app_state};
+use crate::middlewares::authorization::JWTAuthorization;
+use crate::middlewares::content_type::ContentTypeBootstrap;
+use actix_web::dev::{ServiceFactory, ServiceRequest};
+use actix_web::{App, Error, HttpServer};
+use dotenvy::dotenv;
+use std::io;
+use utoipa_actix_web::AppExt;
+use utoipa_actix_web::scope::Scope;
+use utoipa_rapidoc::RapiDoc;
 
-fn main() {
-    let groups = parse_xls(Path::new("./schedule.xls"));
+mod app_state;
 
-    fs::write(
-        "./schedule.json",
-        serde_json::to_string_pretty(&groups)
-            .expect("Failed to serialize schedule!")
-            .as_bytes(),
-    )
-    .expect("Failed to write schedule");
+mod database;
+
+mod xls_downloader;
+
+mod extractors;
+mod middlewares;
+mod routes;
+
+mod utility;
+
+mod test_env;
+
+pub fn get_api_scope<
+    I: Into<Scope<T>>,
+    T: ServiceFactory<ServiceRequest, Config = (), Error = Error, InitError = ()>,
+>(
+    scope: I,
+) -> Scope<T> {
+    let auth_scope = utoipa_actix_web::scope("/auth")
+        .service(routes::auth::sign_in)
+        .service(routes::auth::sign_in_vk)
+        .service(routes::auth::sign_up)
+        .service(routes::auth::sign_up_vk);
+
+    let users_scope = utoipa_actix_web::scope("/users")
+        .wrap(JWTAuthorization::default())
+        .service(routes::users::change_group)
+        .service(routes::users::change_username)
+        .service(routes::users::me);
+
+    let schedule_scope = utoipa_actix_web::scope("/schedule")
+        .wrap(JWTAuthorization {
+            ignore: &["/group-names", "/teacher-names"],
+        })
+        .service(routes::schedule::schedule)
+        .service(routes::schedule::update_download_url)
+        .service(routes::schedule::cache_status)
+        .service(routes::schedule::group)
+        .service(routes::schedule::group_names)
+        .service(routes::schedule::teacher)
+        .service(routes::schedule::teacher_names);
+
+    let fcm_scope = utoipa_actix_web::scope("/fcm")
+        .wrap(JWTAuthorization::default())
+        .service(routes::fcm::update_callback)
+        .service(routes::fcm::set_token);
+
+    let vk_id_scope = utoipa_actix_web::scope("/vkid") //
+        .service(routes::vk_id::oauth);
+
+    utoipa_actix_web::scope(scope)
+        .service(auth_scope)
+        .service(users_scope)
+        .service(schedule_scope)
+        .service(fcm_scope)
+        .service(vk_id_scope)
+}
+
+async fn async_main() -> io::Result<()> {
+    println!("Starting server...");
+
+    let app_state = app_state().await;
+
+    HttpServer::new(move || {
+        let (app, api) = App::new()
+            .into_utoipa_app()
+            .app_data(app_state.clone())
+            .service(
+                get_api_scope("/api/v1")
+                    .wrap(sentry_actix::Sentry::new())
+                    .wrap(ContentTypeBootstrap),
+            )
+            .split_for_parts();
+
+        let rapidoc_service = RapiDoc::with_openapi("/api-docs-json", api).path("/api-docs");
+
+        // Because CORS error on non-localhost
+        let patched_rapidoc_html = rapidoc_service.to_html().replace(
+            "https://unpkg.com/rapidoc/dist/rapidoc-min.js",
+            "https://cdn.jsdelivr.net/npm/rapidoc/dist/rapidoc-min.min.js",
+        );
+
+        app.service(rapidoc_service.custom_html(patched_rapidoc_html))
+    })
+    .workers(4)
+    .bind(("0.0.0.0", 5050))?
+    .run()
+    .await
+}
+
+fn main() -> io::Result<()> {
+    let _guard = sentry::init((
+        "https://9c33db76e89984b3f009b28a9f4b5954@sentry.n08i40k.ru/8",
+        sentry::ClientOptions {
+            release: sentry::release_name!(),
+            send_default_pii: true,
+            ..Default::default()
+        },
+    ));
+
+    dotenv().unwrap();
+
+    env_logger::init();
+
+    actix_web::rt::System::new().block_on(async { async_main().await })?;
+
+    Ok(())
 }

src/middlewares/authorization.rs

@@ -0,0 +1,116 @@
+use crate::database::models::User;
+use crate::extractors::authorized_user;
+use crate::extractors::base::FromRequestSync;
+use actix_web::body::{BoxBody, EitherBody};
+use actix_web::dev::{Payload, Service, ServiceRequest, ServiceResponse, Transform, forward_ready};
+use actix_web::{Error, HttpRequest, ResponseError};
+use futures_util::future::LocalBoxFuture;
+use std::future::{Ready, ready};
+
+/// Middleware guard working with JWT tokens.
+pub struct JWTAuthorization {
+    /// List of ignored endpoints.
+    pub ignore: &'static [&'static str],
+}
+
+impl Default for JWTAuthorization {
+    fn default() -> Self {
+        Self { ignore: &[] }
+    }
+}
+
+impl<S, B> Transform<S, ServiceRequest> for JWTAuthorization
+where
+    S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
+    S::Future: 'static,
+    B: 'static,
+{
+    type Response = ServiceResponse<EitherBody<B, BoxBody>>;
+    type Error = Error;
+    type Transform = JWTAuthorizationMiddleware<S>;
+    type InitError = ();
+    type Future = Ready<Result<Self::Transform, Self::InitError>>;
+
+    fn new_transform(&self, service: S) -> Self::Future {
+        ready(Ok(JWTAuthorizationMiddleware {
+            service,
+            ignore: self.ignore,
+        }))
+    }
+}
+
+pub struct JWTAuthorizationMiddleware<S> {
+    service: S,
+    /// List of ignored endpoints.
+    ignore: &'static [&'static str],
+}
+
+impl<S, B> JWTAuthorizationMiddleware<S>
+where
+    S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
+    S::Future: 'static,
+    B: 'static,
+{
+    /// Checking the validity of the token.
+    fn check_authorization(
+        &self,
+        req: &HttpRequest,
+        payload: &mut Payload,
+    ) -> Result<(), authorized_user::Error> {
+        User::from_request_sync(req, payload)
+            .map(|_| ())
+            .map_err(|e| e.as_error::<authorized_user::Error>().unwrap().clone())
+    }
+
+    fn should_skip(&self, req: &ServiceRequest) -> bool {
+        let path = req.match_info().unprocessed();
+
+        self.ignore.iter().any(|ignore| {
+            if !path.starts_with(ignore) {
+                return false;
+            }
+
+            if let Some(other) = path.as_bytes().iter().nth(ignore.len()) {
+                return ['?' as u8, '/' as u8].contains(other);
+            }
+
+            true
+        })
+    }
+}
+
+impl<'a, S, B> Service<ServiceRequest> for JWTAuthorizationMiddleware<S>
+where
+    S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
+    S::Future: 'static,
+    B: 'static,
+{
+    type Response = ServiceResponse<EitherBody<B, BoxBody>>;
+    type Error = Error;
+    type Future = LocalBoxFuture<'static, Result<Self::Response, Self::Error>>;
+
+    forward_ready!(service);
+
+    fn call(&self, req: ServiceRequest) -> Self::Future {
+        if self.should_skip(&req) {
+            let fut = self.service.call(req);
+            return Box::pin(async move { Ok(fut.await?.map_into_left_body()) });
+        }
+
+        let (http_req, mut payload) = req.into_parts();
+
+        if let Err(err) = self.check_authorization(&http_req, &mut payload) {
+            return Box::pin(async move {
+                Ok(ServiceResponse::new(
+                    http_req,
+                    err.error_response().map_into_right_body(),
+                ))
+            });
+        }
+
+        let req = ServiceRequest::from_parts(http_req, payload);
+        let fut = self.service.call(req);
+
+        Box::pin(async move { Ok(fut.await?.map_into_left_body()) })
+    }
+}

src/middlewares/content_type.rs

@@ -0,0 +1,64 @@
+use actix_web::Error;
+use actix_web::body::{BoxBody, EitherBody};
+use actix_web::dev::{Service, ServiceRequest, ServiceResponse, Transform, forward_ready};
+use actix_web::http::header;
+use actix_web::http::header::HeaderValue;
+use futures_util::future::LocalBoxFuture;
+use std::future::{Ready, ready};
+
+/// Middleware to specify the encoding in the Content-Type header.
+pub struct ContentTypeBootstrap;
+
+impl<S, B> Transform<S, ServiceRequest> for ContentTypeBootstrap
+where
+    S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
+    S::Future: 'static,
+    B: 'static,
+{
+    type Response = ServiceResponse<EitherBody<B, BoxBody>>;
+    type Error = Error;
+    type Transform = ContentTypeMiddleware<S>;
+    type InitError = ();
+    type Future = Ready<Result<Self::Transform, Self::InitError>>;
+
+    fn new_transform(&self, service: S) -> Self::Future {
+        ready(Ok(ContentTypeMiddleware { service }))
+    }
+}
+
+pub struct ContentTypeMiddleware<S> {
+    service: S,
+}
+
+impl<'a, S, B> Service<ServiceRequest> for ContentTypeMiddleware<S>
+where
+    S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
+    S::Future: 'static,
+    B: 'static,
+{
+    type Response = ServiceResponse<EitherBody<B, BoxBody>>;
+    type Error = Error;
+    type Future = LocalBoxFuture<'static, Result<Self::Response, Self::Error>>;
+
+    forward_ready!(service);
+
+    fn call(&self, req: ServiceRequest) -> Self::Future {
+        let fut = self.service.call(req);
+
+        Box::pin(async move {
+            let mut response = fut.await?;
+
+            let headers = response.response_mut().headers_mut();
+            if let Some(content_type) = headers.get("Content-Type") {
+                if content_type == "application/json" {
+                    headers.insert(
+                        header::CONTENT_TYPE,
+                        HeaderValue::from_static("application/json; charset=utf8"),
+                    );
+                }
+            }
+
+            Ok(response.map_into_left_body())
+        })
+    }
+}

src/middlewares/mod.rs

@@ -0,0 +1,2 @@
+pub mod authorization;
+pub mod content_type;

src/routes/auth/mod.rs

@@ -0,0 +1,8 @@
+mod sign_in;
+mod sign_up;
+mod shared;
+
+pub use sign_in::*;
+pub use sign_up::*;
+
+// TODO: change-password

src/routes/auth/shared.rs

@@ -0,0 +1,83 @@
+use jsonwebtoken::errors::ErrorKind;
+use jsonwebtoken::{decode, Algorithm, DecodingKey, Validation};
+use serde::{Deserialize, Serialize};
+
+#[derive(Deserialize, Serialize)]
+struct TokenData {
+    iis: String,
+    sub: i32,
+    app: i32,
+    exp: i32,
+    iat: i32,
+    jti: i32,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct Claims {
+    sub: i32,
+    iis: String,
+    jti: i32,
+    app: i32,
+}
+
+#[derive(Debug, PartialEq)]
+pub enum Error {
+    JwtError(ErrorKind),
+    InvalidSignature,
+    InvalidToken,
+    Expired,
+    UnknownIssuer(String),
+    UnknownType(i32),
+    UnknownClientId(i32),
+}
+
+//noinspection SpellCheckingInspection
+const VK_PUBLIC_KEY: &str = concat!(
+    "-----BEGIN PUBLIC KEY-----\n",
+    "MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAvsvJlhFX9Ju/pvCz1frB\n",
+    "DgJs592VjdwQuRAmnlJAItyHkoiDIOEocPzgcUBTbDf1plDcTyO2RCkUt0pz0WK6\n",
+    "6HNhpJyIfARjaWHeUlv4TpuHXAJJsBKklkU2gf1cjID+40sWWYjtq5dAkXnSJUVA\n",
+    "UR+sq0lJ7GmTdJtAr8hzESqGEcSP15PTs7VUdHZ1nkC2XgkuR8KmKAUb388ji1Q4\n",
+    "n02rJNOPQgd9r0ac4N2v/yTAFPXumO78N25bpcuWf5vcL9e8THk/U2zt7wf+aAWL\n",
+    "748e0pREqNluTBJNZfmhC79Xx6GHtwqHyyduiqfPmejmiujNM/rqnA4e30Tg86Yn\n",
+    "cNZ6vLJyF72Eva1wXchukH/aLispbY+EqNPxxn4zzCWaLKHG87gaCxpVv9Tm0jSD\n",
+    "2es22NjrUbtb+2pAGnXbyDp2eGUqw0RrTQFZqt/VcmmSCE45FlcZMT28otrwG1ZB\n",
+    "kZAb5Js3wLEch3ZfYL8sjhyNRPBmJBrAvzrd8qa3rdUjkC9sKyjGAaHu2MNmFl1Y\n",
+    "JFQ3J54tGpkGgJjD7Kz3w0K6OiPDlVCNQN5sqXm24fCw85Pbi8SJiaLTp/CImrs1\n",
+    "Z3nHW5q8hljA7OGmqfOP0nZS/5zW9GHPyepsI1rW6CympYLJ15WeNzePxYS5KEX9\n",
+    "EncmkSD9b45ge95hJeJZteUCAwEAAQ==\n",
+    "-----END PUBLIC KEY-----"
+);
+
+pub fn parse_vk_id(token_str: &String, client_id: i32) -> Result<i32, Error> {
+    let dkey = DecodingKey::from_rsa_pem(VK_PUBLIC_KEY.as_bytes()).unwrap();
+
+    match decode::<Claims>(&token_str, &dkey, &Validation::new(Algorithm::RS256)) {
+        Ok(token_data) => {
+            let claims = token_data.claims;
+
+            if claims.iis != "VK" {
+                Err(Error::UnknownIssuer(claims.iis))
+            } else if claims.jti != 21 {
+                Err(Error::UnknownType(claims.jti))
+            } else if claims.app != client_id {
+                Err(Error::UnknownClientId(claims.app))
+            } else {
+                Ok(claims.sub)
+            }
+        }
+        Err(err) => Err(match err.into_kind() {
+            ErrorKind::InvalidToken => Error::InvalidToken,
+            ErrorKind::InvalidSignature => Error::InvalidSignature,
+            ErrorKind::InvalidAlgorithmName => Error::InvalidToken,
+            ErrorKind::MissingRequiredClaim(_) => Error::InvalidToken,
+            ErrorKind::ExpiredSignature => Error::Expired,
+            ErrorKind::InvalidAlgorithm => Error::InvalidToken,
+            ErrorKind::MissingAlgorithm => Error::InvalidToken,
+            ErrorKind::Base64(_) => Error::InvalidToken,
+            ErrorKind::Json(_) => Error::InvalidToken,
+            ErrorKind::Utf8(_) => Error::InvalidToken,
+            kind => Error::JwtError(kind),
+        }),
+    }
+}

src/routes/auth/sign_in.rs

@@ -0,0 +1,231 @@
+use self::schema::*;
+use crate::database::driver;
+use crate::database::models::User;
+use crate::routes::auth::shared::parse_vk_id;
+use crate::routes::auth::sign_in::schema::SignInData::{Default, Vk};
+use crate::routes::schema::user::UserResponse;
+use crate::routes::schema::{IntoResponseAsError, ResponseError};
+use crate::utility::mutex::MutexScope;
+use crate::{AppState, utility};
+use actix_web::{post, web};
+use diesel::SaveChangesDsl;
+use web::Json;
+
+async fn sign_in_combined(
+    data: SignInData,
+    app_state: &web::Data<AppState>,
+) -> Result<UserResponse, ErrorCode> {
+    let user = match &data {
+        Default(data) => driver::users::get_by_username(&app_state, &data.username),
+        Vk(id) => driver::users::get_by_vk_id(&app_state, *id),
+    };
+
+    match user {
+        Ok(mut user) => {
+            if let Default(data) = data {
+                match bcrypt::verify(&data.password, &user.password) {
+                    Ok(result) => {
+                        if !result {
+                            return Err(ErrorCode::IncorrectCredentials);
+                        }
+                    }
+                    Err(_) => {
+                        return Err(ErrorCode::IncorrectCredentials);
+                    }
+                }
+            }
+
+            user.access_token = utility::jwt::encode(&user.id);
+
+            app_state.database.scope(|conn| {
+                user.save_changes::<User>(conn)
+                    .expect("Failed to update user")
+            });
+
+            Ok(user.into())
+        }
+
+        Err(_) => Err(ErrorCode::IncorrectCredentials),
+    }
+}
+
+#[utoipa::path(responses(
+    (status = OK, body = UserResponse),
+    (status = NOT_ACCEPTABLE, body = ResponseError<ErrorCode>)
+))]
+#[post("/sign-in")]
+pub async fn sign_in(data: Json<Request>, app_state: web::Data<AppState>) -> ServiceResponse {
+    sign_in_combined(Default(data.into_inner()), &app_state)
+        .await
+        .into()
+}
+
+#[utoipa::path(responses(
+    (status = OK, body = UserResponse),
+    (status = NOT_ACCEPTABLE, body = ResponseError<ErrorCode>)
+))]
+#[post("/sign-in-vk")]
+pub async fn sign_in_vk(
+    data_json: Json<vk::Request>,
+    app_state: web::Data<AppState>,
+) -> ServiceResponse {
+    let data = data_json.into_inner();
+
+    match parse_vk_id(&data.access_token, app_state.vk_id.client_id) {
+        Ok(id) => sign_in_combined(Vk(id), &app_state).await.into(),
+        Err(_) => ErrorCode::InvalidVkAccessToken.into_response(),
+    }
+}
+
+mod schema {
+    use crate::routes::schema::user::UserResponse;
+    use actix_macros::{IntoResponseError, StatusCode};
+    use serde::{Deserialize, Serialize};
+    use utoipa::ToSchema;
+
+    #[derive(Deserialize, Serialize, ToSchema)]
+    #[schema(as = SignIn::Request)]
+    pub struct Request {
+        /// User name.
+        #[schema(examples("n08i40k"))]
+        pub username: String,
+
+        /// Password.
+        pub password: String,
+    }
+
+    pub mod vk {
+        use serde::{Deserialize, Serialize};
+        use utoipa::ToSchema;
+
+        #[derive(Serialize, Deserialize, ToSchema)]
+        #[serde(rename_all = "camelCase")]
+        #[schema(as = SignInVk::Request)]
+        pub struct Request {
+            /// VK ID token.
+            pub access_token: String,
+        }
+    }
+
+    pub type ServiceResponse = crate::routes::schema::Response<UserResponse, ErrorCode>;
+
+    #[derive(Serialize, ToSchema, Clone, IntoResponseError, StatusCode)]
+    #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+    #[schema(as = SignIn::ErrorCode)]
+    #[status_code = "actix_web::http::StatusCode::NOT_ACCEPTABLE"]
+    pub enum ErrorCode {
+        /// Incorrect username or password.
+        IncorrectCredentials,
+
+        /// Invalid VK ID token.
+        InvalidVkAccessToken,
+    }
+
+    /// Internal
+
+    /// Type of authorization.
+    pub enum SignInData {
+        /// User and password name and password.
+        Default(Request),
+
+        /// Identifier of the attached account VK.
+        Vk(i32),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::schema::*;
+    use crate::database::driver;
+    use crate::database::models::{User, UserRole};
+    use crate::routes::auth::sign_in::sign_in;
+    use crate::test_env::tests::{static_app_state, test_app_state, test_env};
+    use crate::utility;
+    use actix_test::test_app;
+    use actix_web::dev::ServiceResponse;
+    use actix_web::http::Method;
+    use actix_web::http::StatusCode;
+    use actix_web::test;
+    use sha1::{Digest, Sha1};
+    use std::fmt::Write;
+
+    async fn sign_in_client(data: Request) -> ServiceResponse {
+        let app = test_app(test_app_state(Default::default()).await, sign_in).await;
+
+        let req = test::TestRequest::with_uri("/sign-in")
+            .method(Method::POST)
+            .set_json(data)
+            .to_request();
+
+        test::call_service(&app, req).await
+    }
+
+    async fn prepare(username: String) {
+        let id = {
+            let mut sha = Sha1::new();
+            sha.update(&username);
+
+            let result = sha.finalize();
+            let bytes = &result[..12];
+
+            let mut hex = String::new();
+            for byte in bytes {
+                write!(&mut hex, "{:02x}", byte).unwrap();
+            }
+
+            hex
+        };
+
+        test_env();
+
+        let app_state = static_app_state().await;
+        driver::users::insert_or_ignore(
+            &app_state,
+            &User {
+                id: id.clone(),
+                username,
+                password: bcrypt::hash("example".to_string(), bcrypt::DEFAULT_COST).unwrap(),
+                vk_id: None,
+                access_token: utility::jwt::encode(&id),
+                group: "ИС-214/23".to_string(),
+                role: UserRole::Student,
+                version: "1.0.0".to_string(),
+            },
+        )
+        .unwrap();
+    }
+
+    #[actix_web::test]
+    async fn sign_in_ok() {
+        prepare("test::sign_in_ok".to_string()).await;
+
+        let resp = sign_in_client(Request {
+            username: "test::sign_in_ok".to_string(),
+            password: "example".to_string(),
+        })
+        .await;
+
+        assert_eq!(resp.status(), StatusCode::OK);
+    }
+
+    #[actix_web::test]
+    async fn sign_in_err() {
+        prepare("test::sign_in_err".to_string()).await;
+
+        let invalid_username = sign_in_client(Request {
+            username: "test::sign_in_err::username".to_string(),
+            password: "example".to_string(),
+        })
+        .await;
+
+        assert_eq!(invalid_username.status(), StatusCode::NOT_ACCEPTABLE);
+
+        let invalid_password = sign_in_client(Request {
+            username: "test::sign_in_err".to_string(),
+            password: "bad_password".to_string(),
+        })
+        .await;
+
+        assert_eq!(invalid_password.status(), StatusCode::NOT_ACCEPTABLE);
+    }
+}

src/routes/auth/sign_up.rs

@@ -0,0 +1,371 @@
+use self::schema::*;
+use crate::AppState;
+use crate::database::driver;
+use crate::database::models::UserRole;
+use crate::routes::auth::shared::{Error, parse_vk_id};
+use crate::routes::schema::user::UserResponse;
+use crate::routes::schema::{IntoResponseAsError, ResponseError};
+use actix_web::{post, web};
+use rand::{Rng, rng};
+use web::Json;
+
+async fn sign_up_combined(
+    data: SignUpData,
+    app_state: &web::Data<AppState>,
+) -> Result<UserResponse, ErrorCode> {
+    // If user selected forbidden role.
+    if data.role == UserRole::Admin {
+        return Err(ErrorCode::DisallowedRole);
+    }
+
+    // If specified group doesn't exist in schedule.
+    let schedule_opt = app_state.schedule.lock().unwrap();
+
+    if let Some(schedule) = &*schedule_opt {
+        if !schedule.data.groups.contains_key(&data.group) {
+            return Err(ErrorCode::InvalidGroupName);
+        }
+    }
+
+    // If user with specified username already exists.
+    if driver::users::contains_by_username(&app_state, &data.username) {
+        return Err(ErrorCode::UsernameAlreadyExists);
+    }
+
+    // If user with specified VKID already exists.
+    if let Some(id) = data.vk_id {
+        if driver::users::contains_by_vk_id(&app_state, id) {
+            return Err(ErrorCode::VkAlreadyExists);
+        }
+    }
+
+    let user = data.into();
+    driver::users::insert(&app_state, &user).unwrap();
+
+    Ok(UserResponse::from(&user)).into()
+}
+
+#[utoipa::path(responses(
+    (status = OK, body = UserResponse),
+    (status = NOT_ACCEPTABLE, body = ResponseError<ErrorCode>)
+))]
+#[post("/sign-up")]
+pub async fn sign_up(data_json: Json<Request>, app_state: web::Data<AppState>) -> ServiceResponse {
+    let data = data_json.into_inner();
+
+    sign_up_combined(
+        SignUpData {
+            username: data.username,
+            password: data.password,
+            vk_id: None,
+            group: data.group,
+            role: data.role,
+            version: data.version,
+        },
+        &app_state,
+    )
+    .await
+    .into()
+}
+
+#[utoipa::path(responses(
+    (status = OK, body = UserResponse),
+    (status = NOT_ACCEPTABLE, body = ResponseError<ErrorCode>)
+))]
+#[post("/sign-up-vk")]
+pub async fn sign_up_vk(
+    data_json: Json<vk::Request>,
+    app_state: web::Data<AppState>,
+) -> ServiceResponse {
+    let data = data_json.into_inner();
+
+    match parse_vk_id(&data.access_token, app_state.vk_id.client_id) {
+        Ok(id) => sign_up_combined(
+            SignUpData {
+                username: data.username,
+                password: rng()
+                    .sample_iter(&rand::distr::Alphanumeric)
+                    .take(16)
+                    .map(char::from)
+                    .collect(),
+                vk_id: Some(id),
+                group: data.group,
+                role: data.role,
+                version: data.version,
+            },
+            &app_state,
+        )
+        .await
+        .into(),
+        Err(err) => {
+            if err != Error::Expired {
+                eprintln!("Failed to parse vk id token!");
+                eprintln!("{:?}", err);
+            }
+
+            ErrorCode::InvalidVkAccessToken.into_response()
+        }
+    }
+}
+
+mod schema {
+    use crate::database::models::{User, UserRole};
+    use crate::routes::schema::user::UserResponse;
+    use crate::utility;
+    use actix_macros::{IntoResponseError, StatusCode};
+    use objectid::ObjectId;
+    use serde::{Deserialize, Serialize};
+
+    /// WEB
+
+    #[derive(Serialize, Deserialize, utoipa::ToSchema)]
+    #[schema(as = SignUp::Request)]
+    pub struct Request {
+        /// User name.
+        #[schema(examples("n08i40k"))]
+        pub username: String,
+
+        /// Password.
+        pub password: String,
+
+        /// Group.
+        #[schema(examples("ИС-214/23"))]
+        pub group: String,
+
+        /// Role.
+        pub role: UserRole,
+
+        /// Version of the installed Polytechnic+ application.
+        #[schema(examples("3.0.0"))]
+        pub version: String,
+    }
+
+    pub mod vk {
+        use crate::database::models::UserRole;
+        use serde::{Deserialize, Serialize};
+
+        #[derive(Serialize, Deserialize, utoipa::ToSchema)]
+        #[serde(rename_all = "camelCase")]
+        #[schema(as = SignUpVk::Request)]
+        pub struct Request {
+            /// VK ID token.
+            pub access_token: String,
+
+            /// User name.
+            #[schema(examples("n08i40k"))]
+            pub username: String,
+
+            /// Group.
+            #[schema(examples("ИС-214/23"))]
+            pub group: String,
+
+            /// Role.
+            pub role: UserRole,
+
+            /// Version of the installed Polytechnic+ application.
+            #[schema(examples("3.0.0"))]
+            pub version: String,
+        }
+    }
+
+    pub type ServiceResponse = crate::routes::schema::Response<UserResponse, ErrorCode>;
+
+    #[derive(Clone, Serialize, utoipa::ToSchema, IntoResponseError, StatusCode)]
+    #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+    #[schema(as = SignUp::ErrorCode)]
+    #[status_code = "actix_web::http::StatusCode::NOT_ACCEPTABLE"]
+    pub enum ErrorCode {
+        /// Conveyed the role of Admin.
+        DisallowedRole,
+
+        /// Unknown name of the group.
+        InvalidGroupName,
+
+        /// User with this name is already registered.
+        UsernameAlreadyExists,
+
+        /// Invalid VK ID token.
+        InvalidVkAccessToken,
+
+        /// User with such an account VK is already registered.
+        VkAlreadyExists,
+    }
+
+    /// Internal
+
+    /// Data for registration.
+    pub struct SignUpData {
+        /// User name.
+        pub username: String,
+
+        /// Password.
+        ///
+        /// Should be present even if registration occurs using the VK ID token.
+        pub password: String,
+
+        /// Account identifier VK.
+        pub vk_id: Option<i32>,
+
+        /// Group.
+        pub group: String,
+
+        /// Role.
+        pub role: UserRole,
+
+        /// Version of the installed Polytechnic+ application.
+        pub version: String,
+    }
+
+    impl Into<User> for SignUpData {
+        fn into(self) -> User {
+            let id = ObjectId::new().unwrap().to_string();
+            let access_token = utility::jwt::encode(&id);
+
+            User {
+                id,
+                username: self.username,
+                password: bcrypt::hash(self.password, bcrypt::DEFAULT_COST).unwrap(),
+                vk_id: self.vk_id,
+                access_token,
+                group: self.group,
+                role: self.role,
+                version: self.version,
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::database::driver;
+    use crate::database::models::UserRole;
+    use crate::routes::auth::sign_up::schema::Request;
+    use crate::routes::auth::sign_up::sign_up;
+    use crate::test_env::tests::{
+        TestAppStateParams, TestScheduleType, static_app_state, test_app_state, test_env,
+    };
+    use actix_test::test_app;
+    use actix_web::dev::ServiceResponse;
+    use actix_web::http::Method;
+    use actix_web::http::StatusCode;
+    use actix_web::test;
+
+    struct SignUpPartial {
+        username: String,
+        group: String,
+        role: UserRole,
+        load_schedule: bool,
+    }
+
+    async fn sign_up_client(data: SignUpPartial) -> ServiceResponse {
+        let app = test_app(
+            test_app_state(TestAppStateParams {
+                schedule: if data.load_schedule {
+                    TestScheduleType::Local
+                } else {
+                    TestScheduleType::None
+                },
+            })
+            .await,
+            sign_up,
+        )
+        .await;
+
+        let req = test::TestRequest::with_uri("/sign-up")
+            .method(Method::POST)
+            .set_json(Request {
+                username: data.username.clone(),
+                password: "example".to_string(),
+                group: data.group.clone(),
+                role: data.role.clone(),
+                version: "1.0.0".to_string(),
+            })
+            .to_request();
+
+        test::call_service(&app, req).await
+    }
+
+    #[actix_web::test]
+    async fn sign_up_valid() {
+        // prepare
+
+        test_env();
+
+        let app_state = static_app_state().await;
+        driver::users::delete_by_username(&app_state, &"test::sign_up_valid".to_string());
+
+        // test
+
+        let resp = sign_up_client(SignUpPartial {
+            username: "test::sign_up_valid".to_string(),
+            group: "ИС-214/23".to_string(),
+            role: UserRole::Student,
+            load_schedule: false,
+        })
+        .await;
+
+        assert_eq!(resp.status(), StatusCode::OK);
+    }
+
+    #[actix_web::test]
+    async fn sign_up_multiple() {
+        // prepare
+
+        test_env();
+
+        let app_state = static_app_state().await;
+        driver::users::delete_by_username(&app_state, &"test::sign_up_multiple".to_string());
+
+        let create = sign_up_client(SignUpPartial {
+            username: "test::sign_up_multiple".to_string(),
+            group: "ИС-214/23".to_string(),
+            role: UserRole::Student,
+            load_schedule: false,
+        })
+        .await;
+
+        assert_eq!(create.status(), StatusCode::OK);
+
+        let resp = sign_up_client(SignUpPartial {
+            username: "test::sign_up_multiple".to_string(),
+            group: "ИС-214/23".to_string(),
+            role: UserRole::Student,
+            load_schedule: false,
+        })
+        .await;
+
+        assert_eq!(resp.status(), StatusCode::NOT_ACCEPTABLE);
+    }
+
+    #[actix_web::test]
+    async fn sign_up_invalid_role() {
+        test_env();
+
+        // test
+        let resp = sign_up_client(SignUpPartial {
+            username: "test::sign_up_invalid_role".to_string(),
+            group: "ИС-214/23".to_string(),
+            role: UserRole::Admin,
+            load_schedule: false,
+        })
+        .await;
+
+        assert_eq!(resp.status(), StatusCode::NOT_ACCEPTABLE);
+    }
+
+    #[actix_web::test]
+    async fn sign_up_invalid_group() {
+        test_env();
+
+        // test
+        let resp = sign_up_client(SignUpPartial {
+            username: "test::sign_up_invalid_group".to_string(),
+            group: "invalid_group".to_string(),
+            role: UserRole::Student,
+            load_schedule: true,
+        })
+        .await;
+
+        assert_eq!(resp.status(), StatusCode::NOT_ACCEPTABLE);
+    }
+}

src/routes/fcm/mod.rs

@@ -0,0 +1,5 @@
+mod update_callback;
+mod set_token;
+
+pub use update_callback::*;
+pub use set_token::*;

src/routes/fcm/set_token.rs

@@ -0,0 +1,114 @@
+use crate::app_state::AppState;
+use crate::database;
+use crate::database::models::FCM;
+use crate::extractors::authorized_user::UserExtractor;
+use crate::extractors::base::SyncExtractor;
+use crate::utility::mutex::{MutexScope, MutexScopeAsync};
+use actix_web::{HttpResponse, Responder, patch, web};
+use diesel::{RunQueryDsl, SaveChangesDsl};
+use firebase_messaging_rs::FCMClient;
+use firebase_messaging_rs::topic::{TopicManagementError, TopicManagementSupport};
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize)]
+struct Params {
+    pub token: String,
+}
+
+async fn get_fcm(
+    app_state: &web::Data<AppState>,
+    user_data: &UserExtractor<true>,
+    token: String,
+) -> Result<FCM, diesel::result::Error> {
+    match user_data.fcm() {
+        Some(fcm) => {
+            let mut fcm = fcm.clone();
+            fcm.token = token;
+
+            Ok(fcm)
+        }
+        None => {
+            let fcm = FCM {
+                user_id: user_data.user().id.clone(),
+                token,
+                topics: vec![],
+            };
+
+            match app_state.database.scope(|conn| {
+                diesel::insert_into(database::schema::fcm::table)
+                    .values(&fcm)
+                    .execute(conn)
+            }) {
+                Ok(_) => Ok(fcm),
+                Err(e) => Err(e),
+            }
+        }
+    }
+}
+
+#[utoipa::path(responses((status = OK)))]
+#[patch("/set-token")]
+pub async fn set_token(
+    app_state: web::Data<AppState>,
+    web::Query(params): web::Query<Params>,
+    user_data: SyncExtractor<UserExtractor<true>>,
+) -> impl Responder {
+    let user_data = user_data.into_inner();
+
+    // If token not changes - exit.
+    if let Some(fcm) = user_data.fcm() {
+        if fcm.token == params.token {
+            return HttpResponse::Ok();
+        }
+    }
+
+    let fcm = get_fcm(&app_state, &user_data, params.token.clone()).await;
+    if let Err(e) = fcm {
+        eprintln!("Failed to get FCM: {e}");
+        return HttpResponse::Ok();
+    }
+
+    let mut fcm = fcm.ok().unwrap();
+
+    // Add default topics.
+    if !fcm.topics.contains(&Some("common".to_string())) {
+        fcm.topics.push(Some("common".to_string()));
+    }
+
+    // Subscribe to default topics.
+    if let Some(e) = app_state
+        .fcm_client
+        .as_ref()
+        .unwrap()
+        .async_scope(
+            async |client: &mut FCMClient| -> Result<(), TopicManagementError> {
+                let mut tokens: Vec<String> = Vec::new();
+                tokens.push(fcm.token.clone());
+
+                for topic in fcm.topics.clone() {
+                    if let Some(topic) = topic {
+                        client.register_tokens_to_topic(topic.clone(), tokens.clone()).await?;
+                    }
+                }
+
+                Ok(())
+            },
+        )
+        .await
+        .err()
+    {
+        eprintln!("Failed to subscribe token to topic: {:?}", e);
+        return HttpResponse::Ok();
+    }
+
+    // Write updates to db.
+    if let Some(e) = app_state
+        .database
+        .scope(|conn| fcm.save_changes::<FCM>(conn))
+        .err()
+    {
+        eprintln!("Failed to update FCM object: {e}");
+    }
+
+    HttpResponse::Ok()
+}

src/routes/fcm/update_callback.rs

@@ -0,0 +1,32 @@
+use crate::app_state::AppState;
+use crate::database::models::User;
+use crate::extractors::base::SyncExtractor;
+use crate::utility::mutex::MutexScope;
+use actix_web::{HttpResponse, Responder, post, web};
+use diesel::SaveChangesDsl;
+
+#[utoipa::path(responses(
+    (status = OK),
+    (status = INTERNAL_SERVER_ERROR)
+))]
+#[post("/update-callback/{version}")]
+async fn update_callback(
+    app_state: web::Data<AppState>,
+    version: web::Path<String>,
+    user: SyncExtractor<User>,
+) -> impl Responder {
+    let mut user = user.into_inner();
+
+    user.version = version.into_inner();
+
+    match app_state
+        .database
+        .scope(|conn| user.save_changes::<User>(conn))
+    {
+        Ok(_) => HttpResponse::Ok(),
+        Err(e) => {
+            eprintln!("Failed to update user: {}", e);
+            HttpResponse::InternalServerError()
+        }
+    }
+}

src/routes/mod.rs

@@ -0,0 +1,6 @@
+pub mod auth;
+pub mod fcm;
+pub mod schedule;
+mod schema;
+pub mod users;
+pub mod vk_id;

src/routes/schedule/cache_status.rs

@@ -0,0 +1,23 @@
+use crate::AppState;
+use crate::routes::schedule::schema::CacheStatus;
+use actix_web::{get, web};
+
+#[utoipa::path(responses(
+    (status = OK, body = CacheStatus),
+))]
+#[get("/cache-status")]
+pub async fn cache_status(app_state: web::Data<AppState>) -> CacheStatus {
+    // Prevent thread lock
+    let has_schedule = app_state
+        .schedule
+        .lock()
+        .as_ref()
+        .map(|res| res.is_some())
+        .unwrap();
+
+    match has_schedule {
+        true => CacheStatus::from(&app_state),
+        false => CacheStatus::default(),
+    }
+    .into()
+}

src/routes/schedule/group.rs

@@ -0,0 +1,96 @@
+use self::schema::*;
+use crate::AppState;
+use crate::database::models::User;
+use crate::extractors::base::SyncExtractor;
+use crate::routes::schema::{IntoResponseAsError, ResponseError};
+use actix_web::{get, web};
+
+#[utoipa::path(responses(
+    (status = OK, body = Response),
+    (
+        status = SERVICE_UNAVAILABLE,
+        body = ResponseError<ErrorCode>,
+        example = json!({
+            "code": "NO_SCHEDULE",
+            "message": "Schedule not parsed yet."
+        })
+    ),
+    (
+        status = NOT_FOUND,
+        body = ResponseError<ErrorCode>,
+        example = json!({
+            "code": "NOT_FOUND",
+            "message": "Required group not found."
+        })
+    ),
+))]
+#[get("/group")]
+pub async fn group(user: SyncExtractor<User>, app_state: web::Data<AppState>) -> ServiceResponse {
+    // Prevent thread lock
+    let schedule_lock = app_state.schedule.lock().unwrap();
+
+    match schedule_lock.as_ref() {
+        None => ErrorCode::NoSchedule.into_response(),
+        Some(schedule) => match schedule.data.groups.get(&user.into_inner().group) {
+            None => ErrorCode::NotFound.into_response(),
+            Some(entry) => Ok(entry.clone().into()).into(),
+        },
+    }
+}
+
+mod schema {
+    use schedule_parser::schema::ScheduleEntry;
+    use actix_macros::{IntoResponseErrorNamed, StatusCode};
+    use chrono::{DateTime, NaiveDateTime, Utc};
+    use derive_more::Display;
+    use serde::Serialize;
+    use utoipa::ToSchema;
+
+    pub type ServiceResponse = crate::routes::schema::Response<Response, ErrorCode>;
+
+    #[derive(Serialize, ToSchema)]
+    #[schema(as = GetGroup::Response)]
+    #[serde(rename_all = "camelCase")]
+    pub struct Response {
+        /// Group schedule.
+        pub group: ScheduleEntry,
+
+        /// ## Outdated variable.
+        ///
+        /// By default, an empty list is returned.
+        #[deprecated = "Will be removed in future versions"]
+        pub updated: Vec<i32>,
+
+        /// ## Outdated variable.
+        ///
+        /// By default, the initial date for unix.
+        #[deprecated = "Will be removed in future versions"]
+        pub updated_at: DateTime<Utc>,
+    }
+
+    #[allow(deprecated)]
+    impl From<ScheduleEntry> for Response {
+        fn from(group: ScheduleEntry) -> Self {
+            Self {
+                group,
+                updated: Vec::new(),
+                updated_at: NaiveDateTime::default().and_utc(),
+            }
+        }
+    }
+
+    #[derive(Clone, Serialize, ToSchema, StatusCode, Display, IntoResponseErrorNamed)]
+    #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+    #[schema(as = GroupSchedule::ErrorCode)]
+    pub enum ErrorCode {
+        /// Schedules have not yet been parsed.
+        #[status_code = "actix_web::http::StatusCode::SERVICE_UNAVAILABLE"]
+        #[display("Schedule not parsed yet.")]
+        NoSchedule,
+
+        /// Group not found.
+        #[status_code = "actix_web::http::StatusCode::NOT_FOUND"]
+        #[display("Required group not found.")]
+        NotFound,
+    }
+}

src/routes/schedule/group_names.rs

@@ -0,0 +1,48 @@
+use self::schema::*;
+use crate::AppState;
+use crate::routes::schedule::schema::ErrorCode;
+use crate::routes::schema::{IntoResponseAsError, ResponseError};
+use actix_web::{get, web};
+
+#[utoipa::path(responses(
+    (status = OK, body = Response),
+    (status = SERVICE_UNAVAILABLE, body = ResponseError<ErrorCode>),
+))]
+#[get("/group-names")]
+pub async fn group_names(app_state: web::Data<AppState>) -> ServiceResponse {
+    // Prevent thread lock
+    let schedule_lock = app_state.schedule.lock().unwrap();
+
+    match schedule_lock.as_ref() {
+        None => ErrorCode::NoSchedule.into_response(),
+        Some(schedule) => {
+            let mut names: Vec<String> = schedule.data.groups.keys().cloned().collect();
+            names.sort();
+            
+            Ok(names.into()).into()
+        }
+    }
+    .into()
+}
+
+mod schema {
+    use crate::routes::schedule::schema::ErrorCode;
+    use serde::Serialize;
+    use utoipa::ToSchema;
+
+    pub type ServiceResponse = crate::routes::schema::Response<Response, ErrorCode>;
+
+    #[derive(Serialize, ToSchema)]
+    #[schema(as = GetGroupNames::Response)]
+    pub struct Response {
+        /// List of group names sorted in alphabetical order.
+        #[schema(examples(json!(["ИС-214/23"])))]
+        pub names: Vec<String>,
+    }
+
+    impl From<Vec<String>> for Response {
+        fn from(names: Vec<String>) -> Self {
+            Self { names }
+        }
+    }
+}

src/routes/schedule/mod.rs

@@ -0,0 +1,16 @@
+mod cache_status;
+mod group;
+mod group_names;
+mod schedule;
+mod schema;
+mod teacher;
+mod teacher_names;
+mod update_download_url;
+
+pub use cache_status::*;
+pub use group::*;
+pub use group_names::*;
+pub use schedule::*;
+pub use teacher::*;
+pub use teacher_names::*;
+pub use update_download_url::*;

src/routes/schedule/schedule.rs

@@ -0,0 +1,25 @@
+use self::schema::*;
+use crate::app_state::AppState;
+use crate::routes::schedule::schema::{ErrorCode, ScheduleView};
+use crate::routes::schema::{IntoResponseAsError, ResponseError};
+use actix_web::{get, web};
+
+#[utoipa::path(responses(
+    (status = OK, body = ScheduleView),
+    (status = SERVICE_UNAVAILABLE, body = ResponseError<ErrorCode>)
+))]
+#[get("/")]
+pub async fn schedule(app_state: web::Data<AppState>) -> ServiceResponse {
+    match ScheduleView::try_from(&app_state) {
+        Ok(res) => Ok(res).into(),
+        Err(e) => match e {
+            ErrorCode::NoSchedule => ErrorCode::NoSchedule.into_response(),
+        },
+    }
+}
+
+mod schema {
+    use crate::routes::schedule::schema::{ErrorCode, ScheduleView};
+
+    pub type ServiceResponse = crate::routes::schema::Response<ScheduleView, ErrorCode>;
+}

src/routes/schedule/schema.rs

@@ -0,0 +1,107 @@
+use crate::app_state::{AppState, Schedule};
+use schedule_parser::schema::ScheduleEntry;
+use actix_macros::{IntoResponseErrorNamed, ResponderJson, StatusCode};
+use actix_web::web;
+use chrono::{DateTime, Duration, Utc};
+use derive_more::Display;
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use utoipa::ToSchema;
+
+/// Response from schedule server.
+#[derive(Serialize, ToSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct ScheduleView {
+    /// ETag schedules on polytechnic server.
+    etag: String,
+
+    /// Schedule update date on polytechnic website.
+    uploaded_at: DateTime<Utc>,
+
+    /// Date last downloaded from the Polytechnic server.
+    downloaded_at: DateTime<Utc>,
+
+    /// Groups schedule.
+    groups: HashMap<String, ScheduleEntry>,
+
+    /// Teachers schedule.
+    teachers: HashMap<String, ScheduleEntry>,
+}
+
+#[derive(Clone, Serialize, ToSchema, StatusCode, Display, IntoResponseErrorNamed)]
+#[status_code = "actix_web::http::StatusCode::SERVICE_UNAVAILABLE"]
+#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+#[schema(as = ScheduleShared::ErrorCode)]
+pub enum ErrorCode {
+    /// Schedules not yet parsed.
+    #[display("Schedule not parsed yet.")]
+    NoSchedule,
+}
+
+impl TryFrom<&web::Data<AppState>> for ScheduleView {
+    type Error = ErrorCode;
+
+    fn try_from(app_state: &web::Data<AppState>) -> Result<Self, Self::Error> {
+        if let Some(schedule) = app_state.schedule.lock().unwrap().clone() {
+            Ok(Self {
+                etag: schedule.etag,
+                uploaded_at: schedule.updated_at,
+                downloaded_at: schedule.parsed_at,
+                groups: schedule.data.groups,
+                teachers: schedule.data.teachers,
+            })
+        } else {
+            Err(ErrorCode::NoSchedule)
+        }
+    }
+}
+
+/// Cached schedule status.
+#[derive(Serialize, Deserialize, ToSchema, ResponderJson)]
+#[serde(rename_all = "camelCase")]
+pub struct CacheStatus {
+    /// Schedule hash.
+    pub cache_hash: String,
+
+    /// Whether the schedule reference needs to be updated.
+    pub cache_update_required: bool,
+
+    /// Last cache update date.
+    pub last_cache_update: i64,
+
+    /// Cached schedule update date.
+    ///
+    /// Determined by the polytechnic's server.
+    pub last_schedule_update: i64,
+}
+
+impl CacheStatus {
+    pub fn default() -> Self {
+        CacheStatus {
+            cache_hash: "0000000000000000000000000000000000000000".to_string(),
+            cache_update_required: true,
+            last_cache_update: 0,
+            last_schedule_update: 0,
+        }
+    }
+}
+
+impl From<&web::Data<AppState>> for CacheStatus {
+    fn from(value: &web::Data<AppState>) -> Self {
+        let schedule_lock = value.schedule.lock().unwrap();
+        let schedule = schedule_lock.as_ref().unwrap();
+
+        CacheStatus::from(schedule)
+    }
+}
+
+impl From<&Schedule> for CacheStatus {
+    fn from(value: &Schedule) -> Self {
+        Self {
+            cache_hash: value.hash(),
+            cache_update_required: (Utc::now() - value.fetched_at) > Duration::minutes(5),
+            last_cache_update: value.fetched_at.timestamp(),
+            last_schedule_update: value.updated_at.timestamp(),
+        }
+    }
+}

src/routes/schedule/teacher.rs

@@ -0,0 +1,97 @@
+use self::schema::*;
+use crate::routes::schema::{IntoResponseAsError, ResponseError};
+use crate::AppState;
+use actix_web::{get, web};
+
+#[utoipa::path(responses(
+    (status = OK, body = Response),
+    (
+        status = SERVICE_UNAVAILABLE,
+        body = ResponseError<ErrorCode>,
+        example = json!({
+            "code": "NO_SCHEDULE",
+            "message": "Schedule not parsed yet."
+        })
+    ),
+    (
+        status = NOT_FOUND,
+        body = ResponseError<ErrorCode>,
+        example = json!({
+            "code": "NOT_FOUND",
+            "message": "Required teacher not found."
+        })
+    ),
+))]
+#[get("/teacher/{name}")]
+pub async fn teacher(
+    name: web::Path<String>,
+    app_state: web::Data<AppState>,
+) -> ServiceResponse {
+    // Prevent thread lock
+    let schedule_lock = app_state.schedule.lock().unwrap();
+
+    match schedule_lock.as_ref() {
+        None => ErrorCode::NoSchedule.into_response(),
+        Some(schedule) => match schedule.data.teachers.get(&name.into_inner()) {
+            None => ErrorCode::NotFound.into_response(),
+            Some(entry) => Ok(entry.clone().into()).into(),
+        },
+    }
+}
+
+mod schema {
+    use schedule_parser::schema::ScheduleEntry;
+    use actix_macros::{IntoResponseErrorNamed, StatusCode};
+    use chrono::{DateTime, NaiveDateTime, Utc};
+    use derive_more::Display;
+    use serde::Serialize;
+    use utoipa::ToSchema;
+
+    pub type ServiceResponse = crate::routes::schema::Response<Response, ErrorCode>;
+
+    #[derive(Serialize, ToSchema)]
+    #[schema(as = GetTeacher::Response)]
+    #[serde(rename_all = "camelCase")]
+    pub struct Response {
+        /// Teacher's schedule.
+        pub teacher: ScheduleEntry,
+
+        /// ## Deprecated variable.
+        ///
+        /// By default, an empty list is returned.
+        #[deprecated = "Will be removed in future versions"]
+        pub updated: Vec<i32>,
+
+        /// ## Deprecated variable.
+        ///
+        /// Defaults to the Unix start date.
+        #[deprecated = "Will be removed in future versions"]
+        pub updated_at: DateTime<Utc>,
+    }
+
+    #[allow(deprecated)]
+    impl From<ScheduleEntry> for Response {
+        fn from(teacher: ScheduleEntry) -> Self {
+            Self {
+                teacher,
+                updated: Vec::new(),
+                updated_at: NaiveDateTime::default().and_utc(),
+            }
+        }
+    }
+
+    #[derive(Clone, Serialize, ToSchema, StatusCode, Display, IntoResponseErrorNamed)]
+    #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+    #[schema(as = TeacherSchedule::ErrorCode)]
+    pub enum ErrorCode {
+        /// Schedules have not yet been parsed.
+        #[status_code = "actix_web::http::StatusCode::SERVICE_UNAVAILABLE"]
+        #[display("Schedule not parsed yet.")]
+        NoSchedule,
+
+        /// Teacher not found.
+        #[status_code = "actix_web::http::StatusCode::NOT_FOUND"]
+        #[display("Required teacher not found.")]
+        NotFound,
+    }
+}

src/routes/schedule/teacher_names.rs

@@ -0,0 +1,48 @@
+use self::schema::*;
+use crate::AppState;
+use crate::routes::schedule::schema::ErrorCode;
+use crate::routes::schema::{IntoResponseAsError, ResponseError};
+use actix_web::{get, web};
+
+#[utoipa::path(responses(
+    (status = OK, body = Response),
+    (status = SERVICE_UNAVAILABLE, body = ResponseError<ErrorCode>),
+))]
+#[get("/teacher-names")]
+pub async fn teacher_names(app_state: web::Data<AppState>) -> ServiceResponse {
+    // Prevent thread lock
+    let schedule_lock = app_state.schedule.lock().unwrap();
+
+    match schedule_lock.as_ref() {
+        None => ErrorCode::NoSchedule.into_response(),
+        Some(schedule) => {
+            let mut names: Vec<String> = schedule.data.teachers.keys().cloned().collect();
+            names.sort();
+
+            Ok(names.into()).into()
+        }
+    }
+    .into()
+}
+
+mod schema {
+    use crate::routes::schedule::schema::ErrorCode;
+    use serde::Serialize;
+    use utoipa::ToSchema;
+
+    pub type ServiceResponse = crate::routes::schema::Response<Response, ErrorCode>;
+
+    #[derive(Serialize, ToSchema)]
+    #[schema(as = GetTeacherNames::Response)]
+    pub struct Response {
+        /// List of teacher names sorted alphabetically.
+        #[schema(examples(json!(["Хомченко Н.Е."])))]
+        pub names: Vec<String>,
+    }
+
+    impl From<Vec<String>> for Response {
+        fn from(names: Vec<String>) -> Self {
+            Self { names }
+        }
+    }
+}

src/routes/schedule/update_download_url.rs

@@ -0,0 +1,140 @@
+use self::schema::*;
+use crate::AppState;
+use crate::app_state::Schedule;
+use schedule_parser::parse_xls;
+use crate::routes::schedule::schema::CacheStatus;
+use crate::routes::schema::{IntoResponseAsError, ResponseError};
+use crate::xls_downloader::interface::{FetchError, XLSDownloader};
+use actix_web::web::Json;
+use actix_web::{patch, web};
+use chrono::Utc;
+
+#[utoipa::path(responses(
+    (status = OK, body = CacheStatus),
+    (status = NOT_ACCEPTABLE, body = ResponseError<ErrorCode>),
+))]
+#[patch("/update-download-url")]
+pub async fn update_download_url(
+    data: Json<Request>,
+    app_state: web::Data<AppState>,
+) -> ServiceResponse {
+    if !data.url.starts_with("https://politehnikum-eng.ru/") {
+        return ErrorCode::NonWhitelistedHost.into_response();
+    }
+
+    let mut downloader = app_state.downloader.lock().unwrap();
+
+    if let Some(url) = &downloader.url {
+        if url.eq(&data.url) {
+            return Ok(CacheStatus::from(&app_state)).into();
+        }
+    }
+
+    match downloader.set_url(data.url.clone()).await {
+        Ok(fetch_result) => {
+            let mut schedule = app_state.schedule.lock().unwrap();
+
+            if schedule.is_some()
+                && fetch_result.uploaded_at < schedule.as_ref().unwrap().updated_at
+            {
+                return ErrorCode::OutdatedSchedule.into_response();
+            }
+
+            match downloader.fetch(false).await {
+                Ok(download_result) => match parse_xls(&download_result.data.unwrap()) {
+                    Ok(data) => {
+                        *schedule = Some(Schedule {
+                            etag: download_result.etag,
+                            fetched_at: download_result.requested_at,
+                            updated_at: download_result.uploaded_at,
+                            parsed_at: Utc::now(),
+                            data,
+                        });
+
+                        Ok(CacheStatus::from(schedule.as_ref().unwrap())).into()
+                    }
+                    Err(error) => {
+                        sentry::capture_error(&error);
+
+                        ErrorCode::InvalidSchedule(error).into_response()
+                    }
+                },
+                Err(error) => {
+                    if let FetchError::Unknown(error) = &error {
+                        sentry::capture_error(&error);
+                    }
+
+                    ErrorCode::DownloadFailed(error).into_response()
+                }
+            }
+        }
+        Err(error) => {
+            if let FetchError::Unknown(error) = &error {
+                sentry::capture_error(&error);
+            }
+
+            ErrorCode::FetchFailed(error).into_response()
+        }
+    }
+}
+
+mod schema {
+    use schedule_parser::schema::ParseError;
+    use crate::routes::schedule::schema::CacheStatus;
+    use actix_macros::{IntoResponseErrorNamed, StatusCode};
+    use derive_more::Display;
+    use serde::{Deserialize, Serialize, Serializer};
+    use utoipa::ToSchema;
+    use crate::xls_downloader::interface::FetchError;
+
+    pub type ServiceResponse = crate::routes::schema::Response<CacheStatus, ErrorCode>;
+
+    #[derive(Serialize, Deserialize, ToSchema)]
+    pub struct Request {
+        /// Schedule link.
+        pub url: String,
+    }
+
+    #[derive(Clone, ToSchema, StatusCode, Display, IntoResponseErrorNamed)]
+    #[status_code = "actix_web::http::StatusCode::NOT_ACCEPTABLE"]
+    #[schema(as = SetDownloadUrl::ErrorCode)]
+    pub enum ErrorCode {
+        /// Transferred link with host different from politehnikum-eng.ru.
+        #[display("URL with unknown host provided. Provide url with 'politehnikum-eng.ru' host.")]
+        NonWhitelistedHost,
+
+        /// Failed to retrieve file metadata.
+        #[display("Unable to retrieve metadata from the specified URL: {_0}")]
+        FetchFailed(FetchError),
+
+        /// Failed to download the file.
+        #[display("Unable to retrieve data from the specified URL: {_0}")]
+        DownloadFailed(FetchError),
+
+        /// The link leads to an outdated schedule.
+        ///
+        /// An outdated schedule refers to a schedule that was published earlier
+        /// than is currently available.
+        #[display("The schedule is older than it already is.")]
+        OutdatedSchedule,
+
+        /// Failed to parse the schedule.
+        #[display("{_0}")]
+        InvalidSchedule(ParseError),
+    }
+
+    impl Serialize for ErrorCode {
+        fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where
+            S: Serializer,
+        {
+            match self {
+                ErrorCode::NonWhitelistedHost => serializer.serialize_str("NON_WHITELISTED_HOST"),
+                ErrorCode::FetchFailed(_) => serializer.serialize_str("FETCH_FAILED"),
+                ErrorCode::DownloadFailed(_) => serializer.serialize_str("DOWNLOAD_FAILED"),
+                ErrorCode::OutdatedSchedule => serializer.serialize_str("OUTDATED_SCHEDULE"),
+                ErrorCode::InvalidSchedule(_) => serializer.serialize_str("INVALID_SCHEDULE"),
+            }
+        }
+    }
+}

src/routes/schema.rs

@@ -0,0 +1,174 @@
+use actix_web::body::EitherBody;
+use actix_web::error::JsonPayloadError;
+use actix_web::http::StatusCode;
+use actix_web::{HttpRequest, HttpResponse, Responder};
+use serde::{Serialize, Serializer};
+use std::convert::Into;
+use utoipa::PartialSchema;
+
+pub struct Response<T, E>(pub Result<T, E>)
+where
+    T: Serialize + PartialSchema,
+    E: Serialize + PartialSchema + Clone + PartialStatusCode;
+
+pub trait PartialStatusCode {
+    fn status_code(&self) -> StatusCode;
+}
+
+/// Transform Response<T, E> into Result<T, E>
+impl<T, E> Into<Result<T, E>> for Response<T, E>
+where
+    T: Serialize + PartialSchema,
+    E: Serialize + PartialSchema + Clone + PartialStatusCode,
+{
+    fn into(self) -> Result<T, E> {
+        self.0
+    }
+}
+
+/// Transform T into Response<T, E>
+impl<T, E> From<Result<T, E>> for Response<T, E>
+where
+    T: Serialize + PartialSchema,
+    E: Serialize + PartialSchema + Clone + PartialStatusCode,
+{
+    fn from(value: Result<T, E>) -> Self {
+        Response(value)
+    }
+}
+
+/// Serialize Response<T, E>
+impl<T, E> Serialize for Response<T, E>
+where
+    T: Serialize + PartialSchema,
+    E: Serialize + PartialSchema + Clone + PartialStatusCode + Into<ResponseError<E>>,
+{
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match &self.0 {
+            Ok(ok) => serializer.serialize_some::<T>(&ok),
+            Err(err) => serializer
+                .serialize_some::<ResponseError<E>>(&ResponseError::<E>::from(err.clone().into())),
+        }
+    }
+}
+
+/// Transform Response<T, E> to HttpResponse<String>
+impl<T, E> Responder for Response<T, E>
+where
+    T: Serialize + PartialSchema,
+    E: Serialize + PartialSchema + Clone + PartialStatusCode + Into<ResponseError<E>>,
+{
+    type Body = EitherBody<String>;
+
+    fn respond_to(self, _: &HttpRequest) -> HttpResponse<Self::Body> {
+        match serde_json::to_string(&self) {
+            Ok(body) => {
+                let code = match &self.0 {
+                    Ok(_) => StatusCode::OK,
+                    Err(e) => e.status_code(),
+                };
+
+                match HttpResponse::build(code)
+                    .content_type(mime::APPLICATION_JSON)
+                    .message_body(body)
+                {
+                    Ok(res) => res.map_into_left_body(),
+                    Err(err) => HttpResponse::from_error(err).map_into_right_body(),
+                }
+            }
+
+            Err(err) => {
+                HttpResponse::from_error(JsonPayloadError::Serialize(err)).map_into_right_body()
+            }
+        }
+    }
+}
+
+/// ResponseError<T>
+///
+/// Field `message` is optional for backwards compatibility with Android App, that produces error if new fields will be added to JSON response.
+#[derive(Serialize, utoipa::ToSchema)]
+pub struct ResponseError<T: Serialize + PartialSchema> {
+    pub code: T,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub message: Option<String>,
+}
+
+pub trait IntoResponseAsError<T>
+where
+    T: Serialize + PartialSchema,
+    Self: Serialize + PartialSchema + Clone + PartialStatusCode + Into<ResponseError<Self>>,
+{
+    fn into_response(self) -> Response<T, Self> {
+        Response(Err(self))
+    }
+}
+
+pub mod user {
+    use crate::database::models::{User, UserRole};
+    use actix_macros::ResponderJson;
+    use serde::Serialize;
+
+    //noinspection SpellCheckingInspection
+    /// Используется для скрытия чувствительных полей, таких как хеш пароля или FCM
+    #[derive(Serialize, utoipa::ToSchema, ResponderJson)]
+    #[serde(rename_all = "camelCase")]
+    pub struct UserResponse {
+        /// UUID
+        #[schema(examples("67dcc9a9507b0000772744a2"))]
+        id: String,
+
+        /// Имя пользователя
+        #[schema(examples("n08i40k"))]
+        username: String,
+
+        /// Группа
+        #[schema(examples("ИС-214/23"))]
+        group: String,
+
+        /// Роль
+        role: UserRole,
+
+        /// Идентификатор привязанного аккаунта VK
+        #[schema(examples(498094647, json!(null)))]
+        vk_id: Option<i32>,
+
+        /// JWT токен доступа
+        #[schema(examples(
+            "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6IjY3ZGNjOWE5NTA3YjAwMDA3NzI3NDRhMiIsImlhdCI6IjE3NDMxMDgwOTkiLCJleHAiOiIxODY5MjUyMDk5In0.rMgXRb3JbT9AvLK4eiY9HMB5LxgUudkpQyoWKOypZFY"
+        ))]
+        access_token: String,
+    }
+
+    /// Create UserResponse from User ref.
+    impl From<&User> for UserResponse {
+        fn from(user: &User) -> Self {
+            UserResponse {
+                id: user.id.clone(),
+                username: user.username.clone(),
+                group: user.group.clone(),
+                role: user.role.clone(),
+                vk_id: user.vk_id.clone(),
+                access_token: user.access_token.clone(),
+            }
+        }
+    }
+
+    /// Transform User to UserResponse.
+    impl From<User> for UserResponse {
+        fn from(user: User) -> Self {
+            UserResponse {
+                id: user.id,
+                username: user.username,
+                group: user.group,
+                role: user.role,
+                vk_id: user.vk_id,
+                access_token: user.access_token,
+            }
+        }
+    }
+}

src/routes/users/change_group.rs

@@ -0,0 +1,85 @@
+use self::schema::*;
+use crate::app_state::AppState;
+use crate::database::driver::users::UserSave;
+use crate::database::models::User;
+use crate::extractors::base::SyncExtractor;
+use crate::routes::schema::IntoResponseAsError;
+use crate::utility::mutex::MutexScope;
+use actix_web::{post, web};
+
+#[utoipa::path(responses((status = OK)))]
+#[post("/change-group")]
+pub async fn change_group(
+    app_state: web::Data<AppState>,
+    user: SyncExtractor<User>,
+    data: web::Json<Request>,
+) -> ServiceResponse {
+    let mut user = user.into_inner();
+
+    if user.group == data.group {
+        return ErrorCode::SameGroup.into_response();
+    }
+
+    if let Some(e) = app_state.schedule.scope(|schedule| match schedule {
+        Some(schedule) => {
+            if schedule.data.groups.contains_key(&data.group) {
+                None
+            } else {
+                Some(ErrorCode::NotFound)
+            }
+        }
+        None => Some(ErrorCode::NoSchedule),
+    }) {
+        return e.into_response();
+    }
+
+    user.group = data.into_inner().group;
+
+    if let Some(e) = user.save(&app_state).err() {
+        eprintln!("Failed to update user: {e}");
+        return ErrorCode::InternalServerError.into_response();
+    }
+
+    Ok(()).into()
+}
+
+mod schema {
+    use actix_macros::{IntoResponseErrorNamed, StatusCode};
+    use derive_more::Display;
+    use serde::{Deserialize, Serialize};
+    use utoipa::ToSchema;
+
+    pub type ServiceResponse = crate::routes::schema::Response<(), ErrorCode>;
+
+    #[derive(Serialize, Deserialize, ToSchema)]
+    #[schema(as = ChangeGroup::Request)]
+    pub struct Request {
+        /// Group name.
+        pub group: String,
+    }
+
+    #[derive(Clone, Serialize, ToSchema, StatusCode, Display, IntoResponseErrorNamed)]
+    #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+    #[schema(as = ChangeGroup::ErrorCode)]
+    #[status_code = "actix_web::http::StatusCode::CONFLICT"]
+    pub enum ErrorCode {
+        /// Schedules have not yet been received.
+        #[display("Schedule not parsed yet.")]
+        #[status_code = "actix_web::http::StatusCode::SERVICE_UNAVAILABLE"]
+        NoSchedule,
+
+        /// Passed the same group name that is currently there.
+        #[display("Passed the same group name as it is at the moment.")]
+        SameGroup,
+
+        /// The required group does not exist.
+        #[display("The required group does not exist.")]
+        #[status_code = "actix_web::http::StatusCode::NOT_FOUND"]
+        NotFound,
+
+        /// Server-side error.
+        #[display("Internal server error.")]
+        #[status_code = "actix_web::http::StatusCode::INTERNAL_SERVER_ERROR"]
+        InternalServerError,
+    }
+}

src/routes/users/change_username.rs

@@ -0,0 +1,70 @@
+use self::schema::*;
+use crate::app_state::AppState;
+use crate::database::driver;
+use crate::database::driver::users::UserSave;
+use crate::database::models::User;
+use crate::extractors::base::SyncExtractor;
+use crate::routes::schema::IntoResponseAsError;
+use actix_web::{post, web};
+
+#[utoipa::path(responses((status = OK)))]
+#[post("/change-username")]
+pub async fn change_username(
+    app_state: web::Data<AppState>,
+    user: SyncExtractor<User>,
+    data: web::Json<Request>,
+) -> ServiceResponse {
+    let mut user = user.into_inner();
+
+    if user.username == data.username {
+        return ErrorCode::SameUsername.into_response();
+    }
+
+    if driver::users::get_by_username(&app_state, &data.username).is_ok() {
+        return ErrorCode::AlreadyExists.into_response();
+    }
+
+    user.username = data.into_inner().username;
+
+    if let Some(e) = user.save(&app_state).err() {
+        eprintln!("Failed to update user: {e}");
+        return ErrorCode::InternalServerError.into_response();
+    }
+
+    Ok(()).into()
+}
+
+mod schema {
+    use actix_macros::{IntoResponseErrorNamed, StatusCode};
+    use derive_more::Display;
+    use serde::{Deserialize, Serialize};
+    use utoipa::ToSchema;
+
+    pub type ServiceResponse = crate::routes::schema::Response<(), ErrorCode>;
+
+    #[derive(Serialize, Deserialize, ToSchema)]
+    #[schema(as = ChangeUsername::Request)]
+    pub struct Request {
+        /// User name.
+        pub username: String,
+    }
+
+    #[derive(Clone, Serialize, ToSchema, StatusCode, Display, IntoResponseErrorNamed)]
+    #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+    #[schema(as = ChangeUsername::ErrorCode)]
+    #[status_code = "actix_web::http::StatusCode::CONFLICT"]
+    pub enum ErrorCode {
+        /// The same name that is currently present is passed.
+        #[display("Passed the same name as it is at the moment.")]
+        SameUsername,
+
+        /// A user with this name already exists.
+        #[display("A user with this name already exists.")]
+        AlreadyExists,
+
+        /// Server-side error.
+        #[display("Internal server error.")]
+        #[status_code = "actix_web::http::StatusCode::INTERNAL_SERVER_ERROR"]
+        InternalServerError,
+    }
+}

src/routes/users/me.rs

@@ -0,0 +1,10 @@
+use crate::database::models::User;
+use crate::extractors::base::SyncExtractor;
+use actix_web::get;
+use crate::routes::schema::user::UserResponse;
+
+#[utoipa::path(responses((status = OK, body = UserResponse)))]
+#[get("/me")]
+pub async fn me(user: SyncExtractor<User>) -> UserResponse {
+    user.into_inner().into()
+}

src/routes/users/mod.rs

@@ -0,0 +1,7 @@
+mod change_group;
+mod change_username;
+mod me;
+
+pub use change_group::*;
+pub use change_username::*;
+pub use me::*;

src/routes/vk_id/mod.rs

@@ -0,0 +1,3 @@
+mod oauth;
+
+pub use oauth::*;

src/routes/vk_id/oauth.rs

@@ -0,0 +1,117 @@
+use self::schema::*;
+use crate::app_state::AppState;
+use crate::routes::schema::{IntoResponseAsError, ResponseError};
+use actix_web::{post, web};
+use serde::Deserialize;
+use std::collections::HashMap;
+use uuid::Uuid;
+
+#[allow(dead_code)]
+#[derive(Deserialize)]
+struct VkIdAuthResponse {
+    refresh_token: String,
+    access_token: String,
+    id_token: String,
+    token_type: String,
+    expires_in: i32,
+    user_id: i32,
+    state: String,
+    scope: String,
+}
+
+#[utoipa::path(responses(
+    (status = OK, body = Response),
+    (
+        status = NOT_ACCEPTABLE,
+        body = ResponseError<ErrorCode>,
+        example = json!({
+            "code": "VK_ID_ERROR",
+            "message": "VK server returned an error"
+        })
+    ),
+))]
+#[post("/oauth")]
+async fn oauth(data: web::Json<Request>, app_state: web::Data<AppState>) -> ServiceResponse {
+    let data = data.into_inner();
+    let state = Uuid::new_v4().simple().to_string();
+
+    let vk_id = &app_state.vk_id;
+    let client_id = vk_id.client_id.clone().to_string();
+
+    let mut params = HashMap::new();
+    params.insert("grant_type", "authorization_code");
+    params.insert("client_id", client_id.as_str());
+    params.insert("state", state.as_str());
+    params.insert("code_verifier", data.code_verifier.as_str());
+    params.insert("code", data.code.as_str());
+    params.insert("device_id", data.device_id.as_str());
+    params.insert("redirect_uri", vk_id.redirect_url.as_str());
+
+    let client = reqwest::Client::new();
+    match client
+        .post("https://id.vk.com/oauth2/auth")
+        .form(&params)
+        .send()
+        .await
+    {
+        Ok(res) => {
+            if !res.status().is_success() {
+                return ErrorCode::VkIdError.into_response();
+            }
+
+            match res.json::<VkIdAuthResponse>().await {
+                Ok(auth_data) =>
+                    Ok(Response {
+                        access_token: auth_data.id_token,
+                    }).into(),
+                Err(error) => {
+                    sentry::capture_error(&error);
+                    
+                    ErrorCode::VkIdError.into_response()
+                }
+            }
+        }
+        Err(_) => ErrorCode::VkIdError.into_response(),
+    }
+}
+
+mod schema {
+    use actix_macros::{IntoResponseErrorNamed, StatusCode};
+    use derive_more::Display;
+    use serde::{Deserialize, Serialize};
+    use utoipa::ToSchema;
+
+    pub type ServiceResponse = crate::routes::schema::Response<Response, ErrorCode>;
+
+    #[derive(Deserialize, ToSchema)]
+    #[serde(rename_all = "camelCase")]
+    #[schema(as = VkIdOAuth::Request)]
+    pub struct Request {
+        /// Код подтверждения authorization_code.
+        pub code: String,
+
+        /// Parameter to protect transmitted data.
+        pub code_verifier: String,
+
+        /// Device ID.
+        pub device_id: String,
+    }
+
+    #[derive(Serialize, ToSchema)]
+    #[serde(rename_all = "camelCase")]
+    #[schema(as = VkIdOAuth::Response)]
+    pub struct Response {
+        /// ID token.
+        pub access_token: String,
+    }
+
+    #[derive(Clone, Serialize, ToSchema, IntoResponseErrorNamed, StatusCode, Display)]
+    #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+    #[schema(as = VkIdOAuth::ErrorCode)]
+    #[status_code = "actix_web::http::StatusCode::NOT_ACCEPTABLE"]
+    pub enum ErrorCode {
+        /// VK server returned an error.
+        #[display("VK server returned an error")]
+        VkIdError,
+    }
+}

src/test_env.rs

@@ -0,0 +1,58 @@
+#[cfg(test)]
+pub(crate) mod tests {
+    use crate::app_state::{AppState, Schedule, app_state};
+    use schedule_parser::test_utils::test_result;
+    use crate::utility::mutex::MutexScope;
+    use actix_web::web;
+    use std::default::Default;
+    use tokio::sync::OnceCell;
+
+    pub fn test_env() {
+        dotenvy::from_path(".env.test").expect("Failed to load test environment file");
+    }
+
+    pub enum TestScheduleType {
+        None,
+        Local,
+    }
+
+    pub struct TestAppStateParams {
+        pub schedule: TestScheduleType,
+    }
+
+    impl Default for TestAppStateParams {
+        fn default() -> Self {
+            Self {
+                schedule: TestScheduleType::None,
+            }
+        }
+    }
+
+    pub async fn test_app_state(params: TestAppStateParams) -> web::Data<AppState> {
+        let state = app_state().await;
+
+        state.schedule.scope(|schedule| {
+            *schedule = match params.schedule {
+                TestScheduleType::None => None,
+                TestScheduleType::Local => Some(Schedule {
+                    etag: "".to_string(),
+                    fetched_at: Default::default(),
+                    updated_at: Default::default(),
+                    parsed_at: Default::default(),
+                    data: test_result().unwrap(),
+                }),
+            }
+        });
+
+        state.clone()
+    }
+
+    pub async fn static_app_state() -> web::Data<AppState> {
+        static STATE: OnceCell<web::Data<AppState>> = OnceCell::const_new();
+
+        STATE
+            .get_or_init(|| test_app_state(Default::default()))
+            .await
+            .clone()
+    }
+}

src/utility/error.rs

@@ -0,0 +1,19 @@
+use std::fmt::{Write};
+use std::fmt::Display;
+use serde::{Deserialize, Serialize};
+
+/// Server response to errors within Middleware.
+#[derive(Serialize, Deserialize)]
+pub struct ResponseErrorMessage<T: Display> {
+    code: T,
+    message: String,
+}
+
+impl<T: Display + Serialize> ResponseErrorMessage<T> {
+    pub fn new(code: T) -> Self {
+        let mut message = String::new();
+        write!(&mut message, "{}", code).unwrap();
+
+        Self { code, message }
+    }
+}

src/utility/hasher.rs

@@ -0,0 +1,38 @@
+use sha1::Digest;
+use std::hash::Hasher;
+
+/// Hesher returning hash from the algorithm implementing Digest
+pub struct DigestHasher<D: Digest> {
+    digest: D,
+}
+
+impl<D> DigestHasher<D>
+where
+    D: Digest,
+{
+    /// Obtain hash.
+    pub fn finalize(self) -> String {
+        hex::encode(self.digest.finalize().0)
+    }
+}
+
+impl<D> From<D> for DigestHasher<D>
+where
+    D: Digest,
+{
+    /// Creating a hash from an algorithm implementing Digest.
+    fn from(digest: D) -> Self {
+        DigestHasher { digest }
+    }
+}
+
+impl<D: Digest> Hasher for DigestHasher<D> {
+    /// Stopper to prevent calling the standard Hasher result.
+    fn finish(&self) -> u64 {
+        unimplemented!("Do not call finish()");
+    }
+
+    fn write(&mut self, bytes: &[u8]) {
+        self.digest.update(bytes);
+    }
+}

src/utility/jwt.rs

@@ -0,0 +1,169 @@
+use chrono::Duration;
+use chrono::Utc;
+use jsonwebtoken::errors::ErrorKind;
+use jsonwebtoken::{Algorithm, DecodingKey, EncodingKey, Header, Validation, decode};
+use serde::{Deserialize, Serialize};
+use serde_with::DisplayFromStr;
+use serde_with::serde_as;
+use std::env;
+use std::mem::discriminant;
+use std::sync::LazyLock;
+
+/// Key for token verification.
+static DECODING_KEY: LazyLock<DecodingKey> = LazyLock::new(|| {
+    let secret = env::var("JWT_SECRET").expect("JWT_SECRET must be set");
+
+    DecodingKey::from_secret(secret.as_bytes())
+});
+
+/// Key for creating a signed token.
+static ENCODING_KEY: LazyLock<EncodingKey> = LazyLock::new(|| {
+    let secret = env::var("JWT_SECRET").expect("JWT_SECRET must be set");
+
+    EncodingKey::from_secret(secret.as_bytes())
+});
+
+/// Token verification errors.
+#[allow(dead_code)]
+#[derive(Debug)]
+pub enum Error {
+    /// The token has a different signature.
+    InvalidSignature,
+
+    /// Token reading error.
+    InvalidToken(ErrorKind),
+
+    /// Token expired.
+    Expired,
+}
+
+impl PartialEq for Error {
+    fn eq(&self, other: &Self) -> bool {
+        discriminant(self) == discriminant(other)
+    }
+}
+
+/// The data the token holds.
+#[serde_as]
+#[derive(Debug, Serialize, Deserialize)]
+struct Claims {
+    /// User account UUID.
+    id: String,
+
+    /// Token creation date.
+    #[serde_as(as = "DisplayFromStr")]
+    iat: u64,
+
+    /// Token expiry date.
+    #[serde_as(as = "DisplayFromStr")]
+    exp: u64,
+}
+
+/// Token signing algorithm.
+pub(crate) const DEFAULT_ALGORITHM: Algorithm = Algorithm::HS256;
+
+/// Checking the token and extracting the UUID of the user account from it.
+pub fn verify_and_decode(token: &String) -> Result<String, Error> {
+    let mut validation = Validation::new(DEFAULT_ALGORITHM);
+
+    validation.required_spec_claims.remove("exp");
+    validation.validate_exp = false;
+
+    let result = decode::<Claims>(&token, &*DECODING_KEY, &validation);
+
+    match result {
+        Ok(token_data) => {
+            if token_data.claims.exp < Utc::now().timestamp().unsigned_abs() {
+                Err(Error::Expired)
+            } else {
+                Ok(token_data.claims.id)
+            }
+        }
+        Err(err) => Err(match err.into_kind() {
+            ErrorKind::InvalidSignature => Error::InvalidSignature,
+            ErrorKind::ExpiredSignature => Error::Expired,
+            kind => Error::InvalidToken(kind),
+        }),
+    }
+}
+
+/// Creating a user token.
+pub fn encode(id: &String) -> String {
+    let header = Header {
+        typ: Some(String::from("JWT")),
+        ..Default::default()
+    };
+
+    let iat = Utc::now();
+    let exp = iat + Duration::days(365 * 4);
+
+    let claims = Claims {
+        id: id.clone(),
+        iat: iat.timestamp().unsigned_abs(),
+        exp: exp.timestamp().unsigned_abs(),
+    };
+
+    jsonwebtoken::encode(&header, &claims, &*ENCODING_KEY).unwrap()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::test_env::tests::test_env;
+
+    #[test]
+    fn test_encode() {
+        test_env();
+
+        assert_eq!(encode(&"test".to_string()).is_empty(), false);
+    }
+
+    #[test]
+    fn test_decode_invalid_token() {
+        test_env();
+
+        let token = "".to_string();
+        let result = verify_and_decode(&token);
+
+        assert!(result.is_err());
+        assert_eq!(
+            result.err().unwrap(),
+            Error::InvalidToken(ErrorKind::InvalidToken)
+        );
+    }
+
+    //noinspection SpellCheckingInspection
+    #[test]
+    fn test_decode_invalid_signature() {
+        test_env();
+
+        let token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOiIxNjE2NTI2Mzc2IiwiaWF0IjoiMTQ5MDM4MjM3NiIsImlkIjoiNjdkY2M5YTk1MDdiMDAwMDc3Mjc0NGEyIn0.Qc2LbMJTvl2hWzDM2XyQv4m9lIqR84COAESQAieUxz8".to_string();
+        let result = verify_and_decode(&token);
+
+        assert!(result.is_err());
+        assert_eq!(result.err().unwrap(), Error::InvalidSignature);
+    }
+
+    //noinspection SpellCheckingInspection
+    #[test]
+    fn test_decode_expired() {
+        test_env();
+
+        let token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6IjY3ZGNjOWE5NTA3YjAwMDA3NzI3NDRhMiIsImlhdCI6IjAiLCJleHAiOiIwIn0.GBsVYvnZIfHXt00t-qmAdUMyHSyWOBtC0Mrxwg1HQOM".to_string();
+        let result = verify_and_decode(&token);
+
+        assert!(result.is_err());
+        assert_eq!(result.err().unwrap(), Error::Expired);
+    }
+
+    //noinspection SpellCheckingInspection
+    #[test]
+    fn test_decode_ok() {
+        test_env();
+
+        let token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6IjY3ZGNjOWE5NTA3YjAwMDA3NzI3NDRhMiIsImlhdCI6Ijk5OTk5OTk5OTkiLCJleHAiOiI5OTk5OTk5OTk5In0.o1vN-ze5iaJrnlHqe7WARXMBhhzjxTjTKkjlmTGEnOI".to_string();
+        let result = verify_and_decode(&token);
+
+        assert!(result.is_ok());
+    }
+}

src/utility/mod.rs

@@ -0,0 +1,4 @@
+pub mod jwt;
+pub mod error;
+pub mod hasher;
+pub mod mutex;

src/utility/mutex.rs

@@ -0,0 +1,77 @@
+use std::ops::DerefMut;
+use std::sync::Mutex;
+
+pub trait MutexScope<T, ScopeFn, ScopeFnOutput>
+where
+    ScopeFn: FnOnce(&mut T) -> ScopeFnOutput,
+{
+    /// Replaces manually creating a mutex lock to perform operations on the data it manages.
+    ///
+    /// # Arguments
+    ///
+    /// * `f`: Function (mostly lambda) to which a reference to the mutable object stored in the mutex will be passed.
+    ///
+    /// returns: Return value of `f` function.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// let mtx: Mutex<i32> = Mutex::new(10);
+    ///
+    /// let res = mtx.scope(|x| { *x = *x * 2; *x });
+    /// assert_eq!(res, *mtx.lock().unwrap());
+    /// ```
+    fn scope(&self, f: ScopeFn) -> ScopeFnOutput;
+}
+
+impl<T, ScopeFn, ScopeFnOutput> MutexScope<T, ScopeFn, ScopeFnOutput> for Mutex<T>
+where
+    ScopeFn: FnOnce(&mut T) -> ScopeFnOutput,
+{
+    fn scope(&self, f: ScopeFn) -> ScopeFnOutput {
+        let mut lock = self.lock().unwrap();
+        let inner = lock.deref_mut();
+
+        f(inner)
+    }
+}
+
+pub trait MutexScopeAsync<T> {
+    /// ## Asynchronous variant of [MutexScope::scope][MutexScope::scope].
+    ///
+    /// Replaces manually creating a mutex lock to perform operations on the data it manages.
+    ///
+    /// # Arguments
+    ///
+    /// * `f`: Asynchronous function (mostly lambda) to which a reference to the mutable object stored in the mutex will be passed.
+    ///
+    /// returns: Return value of `f` function.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// let mtx: Mutex<i32> = Mutex::new(10);
+    ///
+    /// let res = mtx.async_scope(async |x| { *x = *x * 2; *x }).await;
+    /// assert_eq!(res, *mtx.lock().unwrap());
+    /// ```
+    async fn async_scope<'a, F, FnFut, FnOut>(&'a self, f: F) -> FnOut
+    where
+        FnFut: Future<Output = FnOut>,
+        F: FnOnce(&'a mut T) -> FnFut,
+        T: 'a;
+}
+
+impl<T> MutexScopeAsync<T> for Mutex<T> {
+    async fn async_scope<'a, F, FnFut, FnOut>(&'a self, f: F) -> FnOut
+    where
+        FnFut: Future<Output = FnOut>,
+        F: FnOnce(&'a mut T) -> FnFut,
+        T: 'a,
+    {
+        let mut guard = self.lock().unwrap();
+
+        let ptr: &'a mut T = unsafe { &mut *(guard.deref_mut() as *mut _) };
+        f(ptr).await
+    }
+}

src/xls_downloader/basic_impl.rs

@@ -0,0 +1,216 @@
+use crate::xls_downloader::interface::{FetchError, FetchOk, FetchResult, XLSDownloader};
+use chrono::{DateTime, Utc};
+use std::env;
+use std::sync::Arc;
+
+pub struct BasicXlsDownloader {
+    pub url: Option<String>,
+    user_agent: String,
+}
+
+async fn fetch_specified(url: &String, user_agent: &String, head: bool) -> FetchResult {
+    let client = reqwest::Client::new();
+
+    let response = if head {
+        client.head(url)
+    } else {
+        client.get(url)
+    }
+    .header("User-Agent", user_agent.clone())
+    .send()
+    .await;
+
+    match response {
+        Ok(r) => {
+            if r.status().as_u16() != 200 {
+                return Err(FetchError::BadStatusCode(r.status().as_u16()));
+            }
+
+            let headers = r.headers();
+
+            let content_type = headers.get("Content-Type");
+            let etag = headers.get("etag");
+            let last_modified = headers.get("last-modified");
+            let date = headers.get("date");
+
+            if content_type.is_none() {
+                Err(FetchError::BadHeaders("Content-Type".to_string()))
+            } else if etag.is_none() {
+                Err(FetchError::BadHeaders("ETag".to_string()))
+            } else if last_modified.is_none() {
+                Err(FetchError::BadHeaders("Last-Modified".to_string()))
+            } else if date.is_none() {
+                Err(FetchError::BadHeaders("Date".to_string()))
+            } else if content_type.unwrap() != "application/vnd.ms-excel" {
+                Err(FetchError::BadContentType(
+                    content_type.unwrap().to_str().unwrap().to_string(),
+                ))
+            } else {
+                let etag = etag.unwrap().to_str().unwrap().to_string();
+                let last_modified =
+                    DateTime::parse_from_rfc2822(&last_modified.unwrap().to_str().unwrap())
+                        .unwrap()
+                        .with_timezone(&Utc);
+
+                Ok(if head {
+                    FetchOk::head(etag, last_modified)
+                } else {
+                    FetchOk::get(etag, last_modified, r.bytes().await.unwrap().to_vec())
+                })
+            }
+        }
+        Err(error) => Err(FetchError::Unknown(Arc::new(error))),
+    }
+}
+
+impl BasicXlsDownloader {
+    pub fn new() -> Self {
+        BasicXlsDownloader {
+            url: None,
+            user_agent: env::var("REQWEST_USER_AGENT").expect("USER_AGENT must be set"),
+        }
+    }
+}
+
+impl XLSDownloader for BasicXlsDownloader {
+    async fn fetch(&self, head: bool) -> FetchResult {
+        if self.url.is_none() {
+            Err(FetchError::NoUrlProvided)
+        } else {
+            fetch_specified(self.url.as_ref().unwrap(), &self.user_agent, head).await
+        }
+    }
+
+    async fn set_url(&mut self, url: String) -> FetchResult {
+        let result = fetch_specified(&url, &self.user_agent, true).await;
+
+        if let Ok(_) = result {
+            self.url = Some(url);
+        }
+
+        result
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::xls_downloader::basic_impl::{fetch_specified, BasicXlsDownloader};
+    use crate::xls_downloader::interface::{FetchError, XLSDownloader};
+
+    #[tokio::test]
+    async fn bad_url() {
+        let url = "bad_url".to_string();
+        let user_agent = String::new();
+
+        let results = [
+            fetch_specified(&url, &user_agent, true).await,
+            fetch_specified(&url, &user_agent, false).await,
+        ];
+
+        assert!(results[0].is_err());
+        assert!(results[1].is_err());
+    }
+
+    #[tokio::test]
+    async fn bad_status_code() {
+        let url = "https://www.google.com/not-found".to_string();
+        let user_agent = String::new();
+
+        let results = [
+            fetch_specified(&url, &user_agent, true).await,
+            fetch_specified(&url, &user_agent, false).await,
+        ];
+
+        assert!(results[0].is_err());
+        assert!(results[1].is_err());
+
+        let expected_error = FetchError::BadStatusCode(404);
+
+        assert_eq!(*results[0].as_ref().err().unwrap(), expected_error);
+        assert_eq!(*results[1].as_ref().err().unwrap(), expected_error);
+    }
+
+    #[tokio::test]
+    async fn bad_headers() {
+        let url = "https://www.google.com/favicon.ico".to_string();
+        let user_agent = String::new();
+
+        let results = [
+            fetch_specified(&url, &user_agent, true).await,
+            fetch_specified(&url, &user_agent, false).await,
+        ];
+
+        assert!(results[0].is_err());
+        assert!(results[1].is_err());
+
+        let expected_error = FetchError::BadHeaders("ETag".to_string());
+
+        assert_eq!(*results[0].as_ref().err().unwrap(), expected_error);
+        assert_eq!(*results[1].as_ref().err().unwrap(), expected_error);
+    }
+
+    #[tokio::test]
+    async fn bad_content_type() {
+        let url = "https://s3.aero-storage.ldragol.ru/679e5d1145a6ad00843ad3f1/67ddb59fd46303008396ac96%2Fexample.txt".to_string();
+        let user_agent = String::new();
+
+        let results = [
+            fetch_specified(&url, &user_agent, true).await,
+            fetch_specified(&url, &user_agent, false).await,
+        ];
+
+        assert!(results[0].is_err());
+        assert!(results[1].is_err());
+    }
+
+    #[tokio::test]
+    async fn ok() {
+        let url = "https://s3.aero-storage.ldragol.ru/679e5d1145a6ad00843ad3f1/67ddb5fad46303008396ac97%2Fschedule.xls".to_string();
+        let user_agent = String::new();
+
+        let results = [
+            fetch_specified(&url, &user_agent, true).await,
+            fetch_specified(&url, &user_agent, false).await,
+        ];
+
+        assert!(results[0].is_ok());
+        assert!(results[1].is_ok());
+    }
+
+    #[tokio::test]
+    async fn downloader_set_ok() {
+        let url = "https://s3.aero-storage.ldragol.ru/679e5d1145a6ad00843ad3f1/67ddb5fad46303008396ac97%2Fschedule.xls".to_string();
+
+        let mut downloader = BasicXlsDownloader::new();
+
+        assert!(downloader.set_url(url).await.is_ok());
+    }
+
+    #[tokio::test]
+    async fn downloader_set_err() {
+        let url = "bad_url".to_string();
+
+        let mut downloader = BasicXlsDownloader::new();
+
+        assert!(downloader.set_url(url).await.is_err());
+    }
+
+    #[tokio::test]
+    async fn downloader_ok() {
+        let url = "https://s3.aero-storage.ldragol.ru/679e5d1145a6ad00843ad3f1/67ddb5fad46303008396ac97%2Fschedule.xls".to_string();
+
+        let mut downloader = BasicXlsDownloader::new();
+
+        assert!(downloader.set_url(url).await.is_ok());
+        assert!(downloader.fetch(false).await.is_ok());
+    }
+
+    #[tokio::test]
+    async fn downloader_no_url_provided() {
+        let downloader = BasicXlsDownloader::new();
+        let result = downloader.fetch(false).await;
+
+        assert!(result.is_err());
+        assert_eq!(result.err().unwrap(), FetchError::NoUrlProvided);
+    }
+}

src/xls_downloader/interface.rs

@@ -0,0 +1,83 @@
+use chrono::{DateTime, Utc};
+use derive_more::Display;
+use std::mem::discriminant;
+use std::sync::Arc;
+use utoipa::ToSchema;
+
+/// XLS data retrieval errors.
+#[derive(Clone, Debug, ToSchema, Display)]
+pub enum FetchError {
+    /// File url is not set.
+    #[display("The link to the timetable was not provided earlier.")]
+    NoUrlProvided,
+
+    /// Unknown error.
+    #[display("An unknown error occurred while downloading the file.")]
+    #[schema(value_type = String)]
+    Unknown(Arc<reqwest::Error>),
+
+    /// Server returned a status code different from 200.
+    #[display("Server returned a status code {_0}.")]
+    BadStatusCode(u16),
+
+    /// The url leads to a file of a different type.
+    #[display("The link leads to a file of type '{_0}'.")]
+    BadContentType(String),
+
+    /// Server doesn't return expected headers.
+    #[display("Server doesn't return expected header(s) '{_0}'.")]
+    BadHeaders(String),
+}
+
+impl PartialEq for FetchError {
+    fn eq(&self, other: &Self) -> bool {
+        discriminant(self) == discriminant(other)
+    }
+}
+
+/// Result of XLS data retrieval.
+pub struct FetchOk {
+    /// ETag object.
+    pub etag: String,
+
+    /// File upload date.
+    pub uploaded_at: DateTime<Utc>,
+
+    /// Date data received.
+    pub requested_at: DateTime<Utc>,
+
+    /// File data.
+    pub data: Option<Vec<u8>>,
+}
+
+impl FetchOk {
+    /// Result without file content.
+    pub fn head(etag: String, uploaded_at: DateTime<Utc>) -> Self {
+        FetchOk {
+            etag,
+            uploaded_at,
+            requested_at: Utc::now(),
+            data: None,
+        }
+    }
+
+    /// Full result.
+    pub fn get(etag: String, uploaded_at: DateTime<Utc>, data: Vec<u8>) -> Self {
+        FetchOk {
+            etag,
+            uploaded_at,
+            requested_at: Utc::now(),
+            data: Some(data),
+        }
+    }
+}
+
+pub type FetchResult = Result<FetchOk, FetchError>;
+
+pub trait XLSDownloader {
+    /// Get data about the file, and optionally its content.
+    async fn fetch(&self, head: bool) -> FetchResult;
+
+    /// Setting the file link.
+    async fn set_url(&mut self, url: String) -> FetchResult;
+}

src/xls_downloader/mod.rs

@@ -0,0 +1,2 @@
+pub mod basic_impl;
+pub mod interface;