From 35f707901f276ace2d4ea3fb2d31b1b8e28ea685 Mon Sep 17 00:00:00 2001
From: n08i40k <nhomcencko1@gmail.com>
Date: Sat, 6 Sep 2025 21:24:52 +0400
Subject: [PATCH] chore(clippy): fix all clippy warnings

---
 actix-macros/src/lib.rs                       |   6 +-
 database/src/query.rs                         |   1 +
 .../provider-engels-polytechnic/src/lib.rs    |   4 +-
 .../src/parser/mod.rs                         | 104 ++++++++----------
 .../src/updater.rs                            |  12 +-
 .../src/xls_downloader.rs                     |   6 +-
 src/extractors/authorized_user.rs             |   1 -
 src/extractors/base.rs                        |   2 -
 src/middlewares/authorization.rs              |  19 ++--
 src/middlewares/content_type.rs               |  23 ++--
 src/routes/auth/shared.rs                     |   8 +-
 src/routes/auth/sign_in.rs                    |   4 +-
 src/routes/auth/sign_up.rs                    |  33 +++---
 src/routes/flow/telegram_auth.rs              |   3 +-
 src/routes/flow/telegram_complete.rs          |   1 -
 src/routes/schedule/cache_status.rs           |  10 +-
 src/routes/schedule/{schedule.rs => get.rs}   |   0
 src/routes/schedule/mod.rs                    |   4 +-
 src/routes/schedule/schema.rs                 |  12 --
 src/routes/schema.rs                          |  18 +--
 src/routes/users/change_group.rs              |   1 -
 src/routes/users/change_username.rs           |   1 -
 src/state/mod.rs                              |   8 +-
 src/utility/jwt.rs                            |  10 +-
 src/utility/telegram.rs                       |   2 +-
 25 files changed, 126 insertions(+), 167 deletions(-)
 rename src/routes/schedule/{schedule.rs => get.rs} (100%)

diff --git a/actix-macros/src/lib.rs b/actix-macros/src/lib.rs
index 50a8c3b..da031a1 100644
--- a/actix-macros/src/lib.rs
+++ b/actix-macros/src/lib.rs
@@ -6,7 +6,7 @@ mod shared {
     use quote::{ToTokens, quote};
     use syn::{Attribute, DeriveInput};
 
-    pub fn find_status_code(attrs: &Vec<Attribute>) -> Option<proc_macro2::TokenStream> {
+    pub fn find_status_code(attrs: &[Attribute]) -> Option<proc_macro2::TokenStream> {
         attrs
             .iter()
             .find_map(|attr| -> Option<proc_macro2::TokenStream> {
@@ -41,14 +41,12 @@ mod shared {
 
         let mut status_code_arms: Vec<proc_macro2::TokenStream> = variants
             .iter()
-            .map(|v| -> Option<proc_macro2::TokenStream> {
+            .filter_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() {
diff --git a/database/src/query.rs b/database/src/query.rs
index 746bf48..8712c9e 100644
--- a/database/src/query.rs
+++ b/database/src/query.rs
@@ -59,4 +59,5 @@ impl Query {
     define_is_exists!(user, id, str, Id);
     define_is_exists!(user, username, str, Username);
     define_is_exists!(user, telegram_id, i64, TelegramId);
+    define_is_exists!(user, vk_id, i32, VkId);
 }
diff --git a/providers/provider-engels-polytechnic/src/lib.rs b/providers/provider-engels-polytechnic/src/lib.rs
index f6e2a08..1f1a6cc 100644
--- a/providers/provider-engels-polytechnic/src/lib.rs
+++ b/providers/provider-engels-polytechnic/src/lib.rs
@@ -25,7 +25,7 @@ pub struct EngelsPolytechnicProvider {
 }
 
 impl EngelsPolytechnicProvider {
-    pub async fn new(
+    pub async fn get(
         update_source: UpdateSource,
     ) -> Result<Arc<dyn ScheduleProvider>, crate::updater::error::Error> {
         let (updater, snapshot) = Updater::new(update_source).await?;
@@ -60,7 +60,7 @@ impl ScheduleProvider for Wrapper {
 
                     log::info!("Updating schedule...");
 
-                    match this.updater.update(&mut this.snapshot).await {
+                    match this.updater.update(&this.snapshot).await {
                         Ok(snapshot) => {
                             this.snapshot = Arc::new(snapshot);
                         },
diff --git a/providers/provider-engels-polytechnic/src/parser/mod.rs b/providers/provider-engels-polytechnic/src/parser/mod.rs
index c9eb554..3c83656 100644
--- a/providers/provider-engels-polytechnic/src/parser/mod.rs
+++ b/providers/provider-engels-polytechnic/src/parser/mod.rs
@@ -1,5 +1,5 @@
 use crate::or_continue;
-use crate::parser::error::{ErrorCell, ErrorCellPos};
+use crate::parser::error::{Error, ErrorCell, ErrorCellPos};
 use crate::parser::worksheet::WorkSheet;
 use crate::parser::LessonParseResult::{Lessons, Street};
 use base::LessonType::Break;
@@ -230,7 +230,7 @@ enum LessonParseResult {
 
 // noinspection GrazieInspection
 /// Obtaining a non-standard type of lesson by name.
-fn guess_lesson_type(text: &String) -> Option<LessonType> {
+fn guess_lesson_type(text: &str) -> Option<LessonType> {
     static MAP: LazyLock<HashMap<&str, LessonType>> = LazyLock::new(|| {
         HashMap::from([
             ("консультация", LessonType::Consultation),
@@ -245,22 +245,18 @@ fn guess_lesson_type(text: &String) -> Option<LessonType> {
 
     let name_lower = text.to_lowercase();
 
-    match MAP
-        .iter()
-        .map(|(text, lesson_type)| (lesson_type, strsim::levenshtein(text, &*name_lower)))
+    MAP.iter()
+        .map(|(text, lesson_type)| (lesson_type, strsim::levenshtein(text, &name_lower)))
         .filter(|x| x.1 <= 4)
         .min_by_key(|(_, score)| *score)
-    {
-        None => None,
-        Some(v) => Some(v.0.clone()),
-    }
+        .map(|v| v.0.clone())
 }
 
 /// Getting a pair or street from a cell.
 fn parse_lesson(
     worksheet: &WorkSheet,
     day: &Day,
-    day_boundaries: &Vec<BoundariesCellInfo>,
+    day_boundaries: &[BoundariesCellInfo],
     lesson_boundaries: &BoundariesCellInfo,
     group_column: u32,
 ) -> Result<LessonParseResult, crate::parser::error::Error> {
@@ -297,7 +293,7 @@ fn parse_lesson(
                 column: group_column,
             }))?;
 
-        let range: Option<[u8; 2]> = if lesson_boundaries.default_index != None {
+        let range: Option<[u8; 2]> = if lesson_boundaries.default_index.is_some() {
             let default = lesson_boundaries.default_index.unwrap() as u8;
             Some([default, end_time.default_index.unwrap() as u8])
         } else {
@@ -312,7 +308,11 @@ fn parse_lesson(
         Ok((range, time))
     }?;
 
-    let (name, mut subgroups, lesson_type) = parse_name_and_subgroups(&name)?;
+    let ParsedLessonName {
+        name,
+        mut subgroups,
+        r#type: lesson_type,
+    } = parse_name_and_subgroups(&name)?;
 
     {
         let cabinets: Vec<String> = parse_cabinets(
@@ -325,12 +325,10 @@ fn parse_lesson(
 
         if cab_count == 1 {
             // Назначаем этот кабинет всем подгруппам
-            let cab = Some(cabinets.get(0).unwrap().clone());
+            let cab = Some(cabinets.first().unwrap().clone());
 
-            for subgroup in &mut subgroups {
-                if let Some(subgroup) = subgroup {
-                    subgroup.cabinet = cab.clone()
-                }
+            for subgroup in subgroups.iter_mut().flatten() {
+                subgroup.cabinet = cab.clone()
             }
         } else if cab_count == 2 {
             while subgroups.len() < cab_count {
@@ -361,10 +359,7 @@ fn parse_lesson(
         range: default_range,
         name: Some(name),
         time: lesson_time,
-        subgroups: if subgroups.len() == 2
-            && subgroups.get(0).unwrap().is_none()
-            && subgroups.get(1).unwrap().is_none()
-        {
+        subgroups: if subgroups.len() == 2 && subgroups.iter().all(|x| x.is_none()) {
             None
         } else {
             Some(subgroups)
@@ -416,12 +411,15 @@ fn parse_cabinets(worksheet: &WorkSheet, row_range: (u32, u32), column: u32) ->
     cabinets
 }
 
+struct ParsedLessonName {
+    name: String,
+    subgroups: Vec<Option<LessonSubGroup>>,
+    r#type: Option<LessonType>,
+}
+
 //noinspection GrazieInspection
 /// Getting the "pure" name of the lesson and list of teachers from the text of the lesson cell.
-fn parse_name_and_subgroups(
-    text: &String,
-) -> Result<(String, Vec<Option<LessonSubGroup>>, Option<LessonType>), crate::parser::error::Error>
-{
+fn parse_name_and_subgroups(text: &str) -> Result<ParsedLessonName, Error> {
     // Части названия пары:
     // 1. Само название.
     // 2. Список преподавателей и подгрупп.
@@ -458,7 +456,7 @@ fn parse_name_and_subgroups(
     static CLEAN_RE: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"[\s\n\t]+").unwrap());
 
     let text = CLEAN_RE
-        .replace(&text.replace(&[' ', '\t', '\n'], " "), " ")
+        .replace(&text.replace([' ', '\t', '\n'], " "), " ")
         .to_string();
 
     let (lesson_name, subgroups, lesson_type) = match NAMES_REGEX.captures(&text) {
@@ -466,7 +464,7 @@ fn parse_name_and_subgroups(
             let capture = captures.get(0).unwrap();
 
             let subgroups: Vec<Option<LessonSubGroup>> = {
-                let src = capture.as_str().replace(&[' ', '.'], "");
+                let src = capture.as_str().replace([' ', '.'], "");
 
                 let mut shared_subgroup = false;
                 let mut subgroups: [Option<LessonSubGroup>; 2] = [None, None];
@@ -478,7 +476,7 @@ fn parse_name_and_subgroups(
                         .map_or(0, |index| name[(index + 1)..(index + 2)].parse().unwrap());
 
                     let teacher_name = {
-                        let name_end = open_bracket_index.unwrap_or_else(|| name.len());
+                        let name_end = open_bracket_index.unwrap_or(name.len());
 
                         // Я ебал. Как же я долго до этого доходил.
                         format!(
@@ -545,7 +543,11 @@ fn parse_name_and_subgroups(
         None => (text, Vec::new(), None),
     };
 
-    Ok((lesson_name, subgroups, lesson_type))
+    Ok(ParsedLessonName {
+        name: lesson_name,
+        subgroups,
+        r#type: lesson_type,
+    })
 }
 
 /// Getting the start and end of a pair from a cell in the first column of a document.
@@ -554,18 +556,11 @@ fn parse_name_and_subgroups(
 ///
 /// * `cell_data`: text in cell.
 /// * `date`: date of the current day.
-fn parse_lesson_boundaries_cell(
-    cell_data: &String,
-    date: DateTime<Utc>,
-) -> Option<LessonBoundaries> {
+fn parse_lesson_boundaries_cell(cell_data: &str, 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 parse_res = TIME_RE.captures(cell_data)?;
 
     let start_match = parse_res.get(1).unwrap().as_str();
     let start_parts: Vec<&str> = start_match.split(".").collect();
@@ -579,7 +574,7 @@ fn parse_lesson_boundaries_cell(
     };
 
     Some(LessonBoundaries {
-        start: GET_TIME(date.clone(), &start_parts),
+        start: GET_TIME(date, &start_parts),
         end: GET_TIME(date, &end_parts),
     })
 }
@@ -607,7 +602,7 @@ fn parse_day_boundaries(
             continue;
         };
 
-        let lesson_time = parse_lesson_boundaries_cell(&time_cell, date.clone()).ok_or(
+        let lesson_time = parse_lesson_boundaries_cell(&time_cell, date).ok_or(
             error::Error::LessonBoundaries(ErrorCell::new(row, column, time_cell.clone())),
         )?;
 
@@ -652,7 +647,7 @@ fn parse_day_boundaries(
 /// * `week_markup`: markup of the current week.
 fn parse_week_boundaries(
     worksheet: &WorkSheet,
-    week_markup: &Vec<DayCellInfo>,
+    week_markup: &[DayCellInfo],
 ) -> Result<Vec<Vec<BoundariesCellInfo>>, crate::parser::error::Error> {
     let mut result: Vec<Vec<BoundariesCellInfo>> = Vec::new();
 
@@ -671,8 +666,8 @@ fn parse_week_boundaries(
         };
 
         let day_boundaries = parse_day_boundaries(
-            &worksheet,
-            day_markup.date.clone(),
+            worksheet,
+            day_markup.date,
             (day_markup.row, end_row),
             lesson_time_column,
         )?;
@@ -698,7 +693,7 @@ fn convert_groups_to_teachers(
         .map(|day| Day {
             name: day.name.clone(),
             street: day.street.clone(),
-            date: day.date.clone(),
+            date: day.date,
             lessons: vec![],
         })
         .collect();
@@ -774,19 +769,6 @@ fn convert_groups_to_teachers(
 /// * `buffer`: XLS data containing schedule.
 ///
 /// returns: Result<ParseResult, crate::parser::error::Error>
-///
-/// # 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<ParsedSchedule, crate::parser::error::Error> {
     let cursor = Cursor::new(&buffer);
     let mut workbook: Xls<_> =
@@ -800,7 +782,7 @@ pub fn parse_xls(buffer: &Vec<u8>) -> Result<ParsedSchedule, crate::parser::erro
             .clone();
 
         let worksheet_merges = workbook
-            .worksheet_merge_cells(&*worksheet_name)
+            .worksheet_merge_cells(&worksheet_name)
             .ok_or(error::Error::NoWorkSheets)?;
 
         WorkSheet {
@@ -820,7 +802,7 @@ pub fn parse_xls(buffer: &Vec<u8>) -> Result<ParsedSchedule, crate::parser::erro
             days: Vec::new(),
         };
 
-        for day_index in 0..(&week_markup).len() {
+        for day_index in 0..week_markup.len() {
             let day_markup = &week_markup[day_index];
 
             let mut day = Day {
@@ -836,8 +818,8 @@ pub fn parse_xls(buffer: &Vec<u8>) -> Result<ParsedSchedule, crate::parser::erro
                 match &mut parse_lesson(
                     &worksheet,
                     &day,
-                    &day_boundaries,
-                    &lesson_boundaries,
+                    day_boundaries,
+                    lesson_boundaries,
                     group_markup.column,
                 )? {
                     Lessons(lesson) => day.lessons.append(lesson),
diff --git a/providers/provider-engels-polytechnic/src/updater.rs b/providers/provider-engels-polytechnic/src/updater.rs
index 3214974..bc50aa7 100644
--- a/providers/provider-engels-polytechnic/src/updater.rs
+++ b/providers/provider-engels-polytechnic/src/updater.rs
@@ -90,7 +90,7 @@ impl Updater {
             return Err(SnapshotCreationError::SameUrl);
         }
 
-        let head_result = downloader.set_url(&*url).await.map_err(|error| {
+        let head_result = downloader.set_url(&url).await.map_err(|error| {
             if let FetchError::Unknown(error) = &error {
                 sentry::capture_error(&error);
             }
@@ -152,10 +152,10 @@ impl Updater {
             .header("Authorization", format!("Api-Key {}", api_key))
             .send()
             .await
-            .map_err(|error| QueryUrlError::RequestFailed(error))?
+            .map_err(QueryUrlError::RequestFailed)?
             .text()
             .await
-            .map_err(|error| QueryUrlError::RequestFailed(error))?;
+            .map_err(QueryUrlError::RequestFailed)?;
 
         Ok(format!("https://politehnikum-eng.ru{}", uri.trim()))
     }
@@ -196,7 +196,7 @@ impl Updater {
                 log::info!("Obtaining a link using FaaS...");
                 Self::query_url(yandex_api_key, yandex_func_id)
                     .await
-                    .map_err(|error| Error::QueryUrlFailed(error))?
+                    .map_err(Error::QueryUrlFailed)?
             }
             _ => unreachable!(),
         };
@@ -205,7 +205,7 @@ impl Updater {
 
         let snapshot = Self::new_snapshot(&mut this.downloader, url)
             .await
-            .map_err(|error| Error::SnapshotCreationFailed(error))?;
+            .map_err(Error::SnapshotCreationFailed)?;
 
         log::info!("Schedule snapshot successfully created!");
 
@@ -243,7 +243,7 @@ impl Updater {
                 yandex_func_id,
             } => Self::query_url(yandex_api_key.as_str(), yandex_func_id.as_str())
                 .await
-                .map_err(|error| Error::QueryUrlFailed(error))?,
+                .map_err(Error::QueryUrlFailed)?,
             _ => unreachable!(),
         };
 
diff --git a/providers/provider-engels-polytechnic/src/xls_downloader.rs b/providers/provider-engels-polytechnic/src/xls_downloader.rs
index c5e465b..c188575 100644
--- a/providers/provider-engels-polytechnic/src/xls_downloader.rs
+++ b/providers/provider-engels-polytechnic/src/xls_downloader.rs
@@ -136,7 +136,7 @@ impl XlsDownloader {
             return Err(FetchError::bad_content_type(content_type.to_str().unwrap()));
         }
 
-        let last_modified = DateTime::parse_from_rfc2822(&last_modified.to_str().unwrap())
+        let last_modified = DateTime::parse_from_rfc2822(last_modified.to_str().unwrap())
             .unwrap()
             .with_timezone(&Utc);
 
@@ -151,14 +151,14 @@ impl XlsDownloader {
         if self.url.is_none() {
             Err(FetchError::NoUrlProvided)
         } else {
-            Self::fetch_specified(&*self.url.as_ref().unwrap(), head).await
+            Self::fetch_specified(self.url.as_ref().unwrap(), head).await
         }
     }
 
     pub async fn set_url(&mut self, url: &str) -> FetchResult {
         let result = Self::fetch_specified(url, true).await;
 
-        if let Ok(_) = result {
+        if result.is_ok() {
             self.url = Some(url.to_string());
         }
 
diff --git a/src/extractors/authorized_user.rs b/src/extractors/authorized_user.rs
index 7552641..4dc5433 100644
--- a/src/extractors/authorized_user.rs
+++ b/src/extractors/authorized_user.rs
@@ -11,7 +11,6 @@ use database::query::Query;
 use derive_more::Display;
 use serde::{Deserialize, Serialize};
 use std::fmt::Debug;
-use std::ops::Deref;
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Display, MiddlewareError)]
 #[status_code = "actix_web::http::StatusCode::UNAUTHORIZED"]
diff --git a/src/extractors/base.rs b/src/extractors/base.rs
index 9207960..cf3a5e0 100644
--- a/src/extractors/base.rs
+++ b/src/extractors/base.rs
@@ -5,7 +5,6 @@ use std::future::{Ready, ready};
 use std::ops;
 
 /// # Async extractor.
-
 /// Asynchronous object extractor from a query.
 pub struct AsyncExtractor<T>(T);
 
@@ -80,7 +79,6 @@ impl<T: FromRequestAsync> FromRequest for AsyncExtractor<T> {
 }
 
 /// # Sync extractor.
-
 /// Synchronous object extractor from a query.
 pub struct SyncExtractor<T>(T);
 
diff --git a/src/middlewares/authorization.rs b/src/middlewares/authorization.rs
index f293639..90835b1 100644
--- a/src/middlewares/authorization.rs
+++ b/src/middlewares/authorization.rs
@@ -1,25 +1,20 @@
 use crate::extractors::authorized_user;
 use crate::extractors::base::FromRequestAsync;
 use actix_web::body::{BoxBody, EitherBody};
-use actix_web::dev::{Payload, Service, ServiceRequest, ServiceResponse, Transform, forward_ready};
+use actix_web::dev::{forward_ready, Payload, Service, ServiceRequest, ServiceResponse, Transform};
 use actix_web::{Error, HttpRequest, ResponseError};
-use futures_util::future::LocalBoxFuture;
-use std::future::{Ready, ready};
-use std::rc::Rc;
 use database::entity::User;
+use futures_util::future::LocalBoxFuture;
+use std::future::{ready, Ready};
+use std::rc::Rc;
 
 /// Middleware guard working with JWT tokens.
+#[derive(Default)]
 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> + 'static,
@@ -70,8 +65,8 @@ where
                 return false;
             }
 
-            if let Some(other) = path.as_bytes().iter().nth(ignore.len()) {
-                return ['?' as u8, '/' as u8].contains(other);
+            if let Some(other) = path.as_bytes().get(ignore.len()) {
+                return [b'?', b'/'].contains(other);
             }
 
             true
diff --git a/src/middlewares/content_type.rs b/src/middlewares/content_type.rs
index 50ee2b4..e657216 100644
--- a/src/middlewares/content_type.rs
+++ b/src/middlewares/content_type.rs
@@ -1,10 +1,10 @@
-use actix_web::Error;
 use actix_web::body::{BoxBody, EitherBody};
-use actix_web::dev::{Service, ServiceRequest, ServiceResponse, Transform, forward_ready};
+use actix_web::dev::{forward_ready, Service, ServiceRequest, ServiceResponse, Transform};
 use actix_web::http::header;
 use actix_web::http::header::HeaderValue;
+use actix_web::Error;
 use futures_util::future::LocalBoxFuture;
-use std::future::{Ready, ready};
+use std::future::{ready, Ready};
 
 /// Middleware to specify the encoding in the Content-Type header.
 pub struct ContentTypeBootstrap;
@@ -30,7 +30,7 @@ pub struct ContentTypeMiddleware<S> {
     service: S,
 }
 
-impl<'a, S, B> Service<ServiceRequest> for ContentTypeMiddleware<S>
+impl<S, B> Service<ServiceRequest> for ContentTypeMiddleware<S>
 where
     S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
     S::Future: 'static,
@@ -49,13 +49,14 @@ where
             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"),
-                    );
-                }
+
+            if let Some(content_type) = headers.get("Content-Type")
+                && content_type == "application/json"
+            {
+                headers.insert(
+                    header::CONTENT_TYPE,
+                    HeaderValue::from_static("application/json; charset=utf8"),
+                );
             }
 
             Ok(response.map_into_left_body())
diff --git a/src/routes/auth/shared.rs b/src/routes/auth/shared.rs
index 4341dcd..b5ee062 100644
--- a/src/routes/auth/shared.rs
+++ b/src/routes/auth/shared.rs
@@ -22,7 +22,7 @@ struct Claims {
 
 #[derive(Debug, PartialEq)]
 pub enum Error {
-    JwtError(ErrorKind),
+    Jwt(ErrorKind),
     InvalidSignature,
     InvalidToken,
     Expired,
@@ -49,10 +49,10 @@ const VK_PUBLIC_KEY: &str = concat!(
     "-----END PUBLIC KEY-----"
 );
 
-pub fn parse_vk_id(token_str: &String, client_id: i32) -> Result<i32, Error> {
+pub fn parse_vk_id(token_str: &str, 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)) {
+    match decode::<Claims>(token_str, &dkey, &Validation::new(Algorithm::RS256)) {
         Ok(token_data) => {
             let claims = token_data.claims;
 
@@ -77,7 +77,7 @@ pub fn parse_vk_id(token_str: &String, client_id: i32) -> Result<i32, Error> {
             ErrorKind::Base64(_) => Error::InvalidToken,
             ErrorKind::Json(_) => Error::InvalidToken,
             ErrorKind::Utf8(_) => Error::InvalidToken,
-            kind => Error::JwtError(kind),
+            kind => Error::Jwt(kind),
         }),
     }
 }
diff --git a/src/routes/auth/sign_in.rs b/src/routes/auth/sign_in.rs
index de74171..f8d0f6b 100644
--- a/src/routes/auth/sign_in.rs
+++ b/src/routes/auth/sign_in.rs
@@ -28,7 +28,7 @@ async fn sign_in_combined(
                     return Err(ErrorCode::IncorrectCredentials);
                 }
 
-                match bcrypt::verify(&data.password, &user.password.as_ref().unwrap()) {
+                match bcrypt::verify(&data.password, user.password.as_ref().unwrap()) {
                     Ok(result) => {
                         if !result {
                             return Err(ErrorCode::IncorrectCredentials);
@@ -124,8 +124,6 @@ mod schema {
         InvalidVkAccessToken,
     }
 
-    /// Internal
-
     /// Type of authorization.
     pub enum SignInData {
         /// User and password name and password.
diff --git a/src/routes/auth/sign_up.rs b/src/routes/auth/sign_up.rs
index 66730b5..82a8274 100644
--- a/src/routes/auth/sign_up.rs
+++ b/src/routes/auth/sign_up.rs
@@ -8,7 +8,6 @@ use database::entity::sea_orm_active_enums::UserRole;
 use database::entity::ActiveUser;
 use database::query::Query;
 use database::sea_orm::ActiveModelTrait;
-use std::ops::Deref;
 use web::Json;
 
 async fn sign_up_combined(
@@ -42,13 +41,12 @@ async fn sign_up_combined(
     }
 
     // If user with specified VKID already exists.
-    if let Some(id) = data.vk_id {
-        if Query::find_user_by_vk_id(db, id)
+    if let Some(id) = data.vk_id
+        && Query::is_user_exists_by_vk_id(db, id)
             .await
-            .is_ok_and(|user| user.is_some())
-        {
-            return Err(ErrorCode::VkAlreadyExists);
-        }
+            .expect("Failed to check user existence")
+    {
+        return Err(ErrorCode::VkAlreadyExists);
     }
 
     let active_user: ActiveUser = data.into();
@@ -202,8 +200,6 @@ mod schema {
         VkAlreadyExists,
     }
 
-    /// Internal
-
     /// Data for registration.
     pub struct SignUpData {
         // TODO: сделать ограничение на минимальную и максимальную длину при регистрации и смене.
@@ -228,21 +224,21 @@ mod schema {
         pub version: String,
     }
 
-    impl Into<ActiveUser> for SignUpData {
-        fn into(self) -> ActiveUser {
-            assert_ne!(self.password.is_some(), self.vk_id.is_some());
+    impl From<SignUpData> for ActiveUser {
+        fn from(value: SignUpData) -> Self {
+            assert_ne!(value.password.is_some(), value.vk_id.is_some());
 
             ActiveUser {
                 id: Set(ObjectId::new().unwrap().to_string()),
-                username: Set(self.username),
-                password: Set(self
+                username: Set(value.username),
+                password: Set(value
                     .password
                     .map(|x| bcrypt::hash(x, bcrypt::DEFAULT_COST).unwrap())),
-                vk_id: Set(self.vk_id),
+                vk_id: Set(value.vk_id),
                 telegram_id: Set(None),
-                group: Set(Some(self.group)),
-                role: Set(self.role),
-                android_version: Set(Some(self.version)),
+                group: Set(Some(value.group)),
+                role: Set(value.role),
+                android_version: Set(Some(value.version)),
             }
         }
     }
@@ -262,7 +258,6 @@ mod tests {
     use database::entity::{UserColumn, UserEntity};
     use database::sea_orm::ColumnTrait;
     use database::sea_orm::{EntityTrait, QueryFilter};
-    use std::ops::Deref;
 
     struct SignUpPartial<'a> {
         username: &'a str,
diff --git a/src/routes/flow/telegram_auth.rs b/src/routes/flow/telegram_auth.rs
index e132445..9f3c804 100644
--- a/src/routes/flow/telegram_auth.rs
+++ b/src/routes/flow/telegram_auth.rs
@@ -9,7 +9,6 @@ use database::entity::ActiveUser;
 use database::query::Query;
 use database::sea_orm::{ActiveModelTrait, Set};
 use objectid::ObjectId;
-use std::ops::Deref;
 use std::sync::Arc;
 use web::Json;
 
@@ -122,7 +121,7 @@ mod schema {
             &mut self,
             request: &HttpRequest,
             response: &mut HttpResponse<EitherBody<String>>,
-        ) -> () {
+        ) {
             let access_token = &self.access_token;
 
             let app_state = request.app_data::<web::Data<AppState>>().unwrap();
diff --git a/src/routes/flow/telegram_complete.rs b/src/routes/flow/telegram_complete.rs
index 64c6f6f..d77e52a 100644
--- a/src/routes/flow/telegram_complete.rs
+++ b/src/routes/flow/telegram_complete.rs
@@ -6,7 +6,6 @@ use actix_web::{post, web};
 use database::entity::User;
 use database::query::Query;
 use database::sea_orm::{ActiveModelTrait, IntoActiveModel, Set};
-use std::ops::Deref;
 use web::Json;
 
 #[utoipa::path(responses(
diff --git a/src/routes/schedule/cache_status.rs b/src/routes/schedule/cache_status.rs
index ed18854..e4d48e1 100644
--- a/src/routes/schedule/cache_status.rs
+++ b/src/routes/schedule/cache_status.rs
@@ -1,11 +1,17 @@
-use crate::AppState;
 use crate::routes::schedule::schema::CacheStatus;
+use crate::AppState;
 use actix_web::{get, web};
+use std::ops::Deref;
 
 #[utoipa::path(responses(
     (status = OK, body = CacheStatus),
 ))]
 #[get("/cache-status")]
 pub async fn cache_status(app_state: web::Data<AppState>) -> CacheStatus {
-    CacheStatus::from(&app_state).await.into()
+    app_state
+        .get_schedule_snapshot("eng_polytechnic")
+        .await
+        .unwrap()
+        .deref()
+        .into()
 }
diff --git a/src/routes/schedule/schedule.rs b/src/routes/schedule/get.rs
similarity index 100%
rename from src/routes/schedule/schedule.rs
rename to src/routes/schedule/get.rs
diff --git a/src/routes/schedule/mod.rs b/src/routes/schedule/mod.rs
index cd7d11c..704750f 100644
--- a/src/routes/schedule/mod.rs
+++ b/src/routes/schedule/mod.rs
@@ -1,7 +1,7 @@
 mod cache_status;
 mod group;
 mod group_names;
-mod schedule;
+mod get;
 mod schema;
 mod teacher;
 mod teacher_names;
@@ -9,6 +9,6 @@ mod teacher_names;
 pub use cache_status::*;
 pub use group::*;
 pub use group_names::*;
-pub use schedule::*;
+pub use get::*;
 pub use teacher::*;
 pub use teacher_names::*;
diff --git a/src/routes/schedule/schema.rs b/src/routes/schedule/schema.rs
index 6aa5219..6fc968e 100644
--- a/src/routes/schedule/schema.rs
+++ b/src/routes/schedule/schema.rs
@@ -63,18 +63,6 @@ pub struct CacheStatus {
     pub updated_at: i64,
 }
 
-impl CacheStatus {
-    pub async fn from(value: &web::Data<AppState>) -> Self {
-        From::<&ScheduleSnapshot>::from(
-            value
-                .get_schedule_snapshot("eng_polytechnic")
-                .await
-                .unwrap()
-                .deref(),
-        )
-    }
-}
-
 impl From<&ScheduleSnapshot> for CacheStatus {
     fn from(value: &ScheduleSnapshot) -> Self {
         Self {
diff --git a/src/routes/schema.rs b/src/routes/schema.rs
index b9b6e79..bd01117 100644
--- a/src/routes/schema.rs
+++ b/src/routes/schema.rs
@@ -13,13 +13,13 @@ where
     E: Serialize + PartialSchema + Display + PartialErrResponse;
 
 /// Transform Response<T, E> into Result<T, E>
-impl<T, E> Into<Result<T, E>> for Response<T, E>
+impl<T, E> From<Response<T, E>> for Result<T, E>
 where
     T: Serialize + PartialSchema + PartialOkResponse,
     E: Serialize + PartialSchema + Display + PartialErrResponse,
 {
-    fn into(self) -> Result<T, E> {
-        self.0
+    fn from(value: Response<T, E>) -> Self {
+        value.0
     }
 }
 
@@ -46,7 +46,7 @@ where
     {
         match &self.0 {
             Ok(ok) => serializer.serialize_some(&ok),
-            Err(err) => serializer.serialize_some(&ResponseError::<E>::from(err.clone().into())),
+            Err(err) => serializer.serialize_some(&err.clone().into()),
         }
     }
 }
@@ -95,7 +95,7 @@ pub trait PartialOkResponse {
         &mut self,
         _request: &HttpRequest,
         _response: &mut HttpResponse<EitherBody<String>>,
-    ) -> () {
+    ) {
     }
 }
 
@@ -173,8 +173,8 @@ pub mod user {
                 username: user.username.clone(),
                 group: user.group.clone(),
                 role: user.role.clone(),
-                vk_id: user.vk_id.clone(),
-                telegram_id: user.telegram_id.clone(),
+                vk_id: user.vk_id,
+                telegram_id: user.telegram_id,
                 access_token: Some(access_token),
             }
         }
@@ -188,8 +188,8 @@ pub mod user {
                 username: user.username.clone(),
                 group: user.group.clone(),
                 role: user.role.clone(),
-                vk_id: user.vk_id.clone(),
-                telegram_id: user.telegram_id.clone(),
+                vk_id: user.vk_id,
+                telegram_id: user.telegram_id,
                 access_token: None,
             }
         }
diff --git a/src/routes/users/change_group.rs b/src/routes/users/change_group.rs
index 0913f19..8ee038c 100644
--- a/src/routes/users/change_group.rs
+++ b/src/routes/users/change_group.rs
@@ -4,7 +4,6 @@ use crate::state::AppState;
 use actix_web::{post, web};
 use database::entity::User;
 use database::sea_orm::{ActiveModelTrait, IntoActiveModel, Set};
-use std::ops::Deref;
 
 #[utoipa::path(responses((status = OK)))]
 #[post("/change-group")]
diff --git a/src/routes/users/change_username.rs b/src/routes/users/change_username.rs
index 4c942d5..187b124 100644
--- a/src/routes/users/change_username.rs
+++ b/src/routes/users/change_username.rs
@@ -5,7 +5,6 @@ use actix_web::{post, web};
 use database::entity::User;
 use database::query::Query;
 use database::sea_orm::{ActiveModelTrait, IntoActiveModel, Set};
-use std::ops::Deref;
 
 #[utoipa::path(responses((status = OK)))]
 #[post("/change-username")]
diff --git a/src/state/mod.rs b/src/state/mod.rs
index d29883e..9e9e064 100644
--- a/src/state/mod.rs
+++ b/src/state/mod.rs
@@ -23,7 +23,7 @@ impl AppState {
         let env = AppEnv::default();
         let providers: HashMap<String, Arc<dyn ScheduleProvider>> = HashMap::from([(
             "eng_polytechnic".to_string(),
-            providers::EngelsPolytechnicProvider::new({
+            providers::EngelsPolytechnicProvider::get({
                 #[cfg(test)]
                 {
                     providers::EngelsPolytechnicUpdateSource::Prepared(ScheduleSnapshot {
@@ -64,7 +64,7 @@ impl AppState {
         };
 
         if this.env.schedule.auto_update {
-            for (_, provider) in &this.providers {
+            for provider in this.providers.values() {
                 let provider = provider.clone();
                 let cancel_token = this.cancel_token.clone();
 
@@ -93,6 +93,8 @@ impl AppState {
 }
 
 /// Create a new object web::Data<AppState>.
-pub async fn new_app_state(database: Option<DatabaseConnection>) -> Result<web::Data<AppState>, Box<dyn std::error::Error>> {
+pub async fn new_app_state(
+    database: Option<DatabaseConnection>,
+) -> Result<web::Data<AppState>, Box<dyn std::error::Error>> {
     Ok(web::Data::new(AppState::new(database).await?))
 }
diff --git a/src/utility/jwt.rs b/src/utility/jwt.rs
index bd82254..511b687 100644
--- a/src/utility/jwt.rs
+++ b/src/utility/jwt.rs
@@ -63,13 +63,13 @@ struct Claims {
 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> {
+pub fn verify_and_decode(token: &str) -> 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);
+    let result = decode::<Claims>(token, &DECODING_KEY, &validation);
 
     match result {
         Ok(token_data) => {
@@ -88,7 +88,7 @@ pub fn verify_and_decode(token: &String) -> Result<String, Error> {
 }
 
 /// Creating a user token.
-pub fn encode(id: &String) -> String {
+pub fn encode(id: &str) -> String {
     let header = Header {
         typ: Some(String::from("JWT")),
         ..Default::default()
@@ -98,12 +98,12 @@ pub fn encode(id: &String) -> String {
     let exp = iat + Duration::days(365 * 4);
 
     let claims = Claims {
-        id: id.clone(),
+        id: id.to_string(),
         iat: iat.timestamp().unsigned_abs(),
         exp: exp.timestamp().unsigned_abs(),
     };
 
-    jsonwebtoken::encode(&header, &claims, &*ENCODING_KEY).unwrap()
+    jsonwebtoken::encode(&header, &claims, &ENCODING_KEY).unwrap()
 }
 
 #[cfg(test)]
diff --git a/src/utility/telegram.rs b/src/utility/telegram.rs
index 3e9fa03..a4a421a 100644
--- a/src/utility/telegram.rs
+++ b/src/utility/telegram.rs
@@ -33,7 +33,7 @@ impl WebAppInitDataMap {
         };
 
         data.split('&')
-            .map(|kv| kv.split_once('=').unwrap_or_else(|| (kv, "")))
+            .map(|kv| kv.split_once('=').unwrap_or((kv, "")))
             .for_each(|(key, value)| {
                 this.data_map.insert(key.to_string(), value.to_string());
             });