Добавлена возможность создания ResponseError с описанием ошибки.

Добавлен макрос для трансформации ErrorCode в Response, а также для имплементации треита PartialStatusCode.

Cargo.toml

@@ -32,7 +32,7 @@ serde_repr = "0.1.20"
 sha2 = "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"] }
+utoipa = { version = "5", features = ["actix_extras", "chrono"] }
 utoipa-rapidoc = { version = "6.0.0", features = ["actix-web"] }
 utoipa-actix-web = "0.1"
 

actix-macros/src/lib.rs

@@ -2,10 +2,9 @@ extern crate proc_macro;
 
 use proc_macro::TokenStream;
 
-mod response_error_message {
+mod shared {
-    use proc_macro::TokenStream;
     use quote::{ToTokens, quote};
-    use syn::Attribute;
+    use syn::{Attribute, DeriveInput};
 
     pub fn find_status_code(attrs: &Vec<Attribute>) -> Option<proc_macro2::TokenStream> {
         attrs
@@ -31,7 +30,7 @@ mod response_error_message {
             })
     }
 
-    pub fn fmt(ast: &syn::DeriveInput) -> TokenStream {
+    pub fn get_arms(ast: &DeriveInput) -> Vec<proc_macro2::TokenStream> {
         let name = &ast.ident;
 
         let variants = if let syn::Data::Enum(data) = &ast.data {
@@ -54,21 +53,56 @@ mod response_error_message {
 
         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 });
+                .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 {
+            impl ::actix_web::ResponseError for #name {
-                fn status_code(&self) -> actix_web::http::StatusCode {
+                fn status_code(&self) -> ::actix_web::http::StatusCode {
                     match self {
                         #(#status_code_arms)*
                     }
                 }
 
-                fn error_response(&self) -> actix_web::HttpResponse<BoxBody> {
+                fn error_response(&self) -> ::actix_web::HttpResponse<BoxBody> {
-                    actix_web::HttpResponse::build(self.status_code()).json(crate::utility::error::ResponseErrorMessage::new(self.clone()))
+                    ::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)*
+                    }
                 }
             }
         })
@@ -103,7 +137,7 @@ mod responder_json {
     }
 }
 
-mod into_iresponse {
+mod into_response_error {
     use proc_macro::TokenStream;
     use quote::quote;
 
@@ -111,17 +145,37 @@ mod into_iresponse {
         let name = &ast.ident;
 
         TokenStream::from(quote! {
-            impl<E> ::core::convert::Into<crate::routes::schema::IResponse<#name, E>> for #name
+            impl ::core::convert::Into<crate::routes::schema::ResponseError<#name>> for #name {
-            where
+                fn into(self) -> crate::routes::schema::ResponseError<#name> {
-                E: ::serde::ser::Serialize
+                    crate::routes::schema::ResponseError {
-                    + ::utoipa::PartialSchema
+                        code: self,
-                    + ::core::clone::Clone
+                        message: ::core::option::Option::None,
-                    + crate::routes::schema::HttpStatusCode,
+                    }
-            {
-                fn into(self) -> crate::routes::schema::IResponse<#name, E> {
-                    crate::routes::schema::IResponse(Ok(self))
                 }
             }
+
+            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 {}
         })
     }
 }
@@ -140,9 +194,23 @@ pub fn responser_json_derive(input: TokenStream) -> TokenStream {
     responder_json::fmt(&ast)
 }
 
-#[proc_macro_derive(IntoIResponse)]
+#[proc_macro_derive(IntoResponseError)]
-pub fn into_iresponse_derive(input: TokenStream) -> TokenStream {
+pub fn into_response_error_derive(input: TokenStream) -> TokenStream {
     let ast = syn::parse(input).unwrap();
 
-    into_iresponse::fmt(&ast)
+    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)
 }

src/app_state.rs

@@ -1,11 +1,12 @@
+use crate::parser::schema::ParseResult;
 use crate::xls_downloader::basic_impl::BasicXlsDownloader;
 use actix_web::web;
 use chrono::{DateTime, Utc};
 use diesel::{Connection, PgConnection};
 use std::env;
 use std::sync::{Mutex, MutexGuard};
-use crate::parser::schema::ParseResult;
 
+#[derive(Clone)]
 pub struct Schedule {
     pub etag: String,
     pub updated_at: DateTime<Utc>,

src/main.rs

@@ -7,6 +7,7 @@ use actix_web::{App, HttpServer};
 use dotenvy::dotenv;
 use utoipa_actix_web::AppExt;
 use utoipa_rapidoc::RapiDoc;
+use crate::routes::schedule::get_schedule::get_schedule;
 
 mod app_state;
 
@@ -41,9 +42,14 @@ async fn main() {
             .wrap(Authorization)
             .service(me);
         
+        let schedule_scope = utoipa_actix_web::scope("/schedule")
+            .wrap(Authorization)
+            .service(get_schedule);
+
         let api_scope = utoipa_actix_web::scope("/api/v1")
             .service(auth_scope)
-            .service(users_scope);
+            .service(users_scope)
+            .service(schedule_scope);
 
         let (app, api) = App::new()
             .into_utoipa_app()

src/parser/schema.rs

@@ -3,13 +3,14 @@ use serde::{Deserialize, Serialize};
 use serde_repr::{Deserialize_repr, Serialize_repr};
 use std::collections::HashMap;
 
-#[derive(Serialize, Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone, utoipa::ToSchema)]
 pub struct LessonTime {
     pub start: DateTime<Utc>,
     pub end: DateTime<Utc>,
 }
 
-#[derive(Serialize_repr, Deserialize_repr, Debug, PartialEq, Clone)]
+#[derive(Serialize_repr, Deserialize_repr, Debug, PartialEq, Clone, utoipa::ToSchema)]
+#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
 #[repr(u8)]
 pub enum LessonType {
     Default = 0,     // Обычная
@@ -22,7 +23,7 @@ pub enum LessonType {
     ExamDefault,     // Экзамен
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone)]
+#[derive( Serialize, Deserialize, Debug, Clone, utoipa::ToSchema)]
 pub struct LessonSubGroup {
     /**
      * Номер подгруппы.
@@ -40,7 +41,8 @@ pub struct LessonSubGroup {
     pub teacher: String,
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone, utoipa::ToSchema)]
+#[serde(rename_all = "camelCase")]
 pub struct Lesson {
     /**
      * Тип занятия.
@@ -51,7 +53,6 @@ pub struct Lesson {
     /**
      * Индексы пар, если присутствуют.
      */
-    #[serde(rename = "defaultRange")]
     pub default_range: Option<[u8; 2]>,
 
     /**
@@ -76,7 +77,7 @@ pub struct Lesson {
     pub group: Option<String>,
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone, utoipa::ToSchema)]
 pub struct Day {
     /**
      * День недели.
@@ -99,7 +100,7 @@ pub struct Day {
     pub lessons: Vec<Lesson>,
 }
 
-#[derive(Serialize, Deserialize, Debug)]
+#[derive(Clone, Serialize, Deserialize, Debug, utoipa::ToSchema)]
 pub struct ScheduleEntry {
     /**
      * Название группы или ФИО преподавателя.
@@ -112,6 +113,7 @@ pub struct ScheduleEntry {
     pub days: Vec<Day>,
 }
 
+#[derive(Clone)]
 pub struct ParseResult {
     /**
      * Список групп.

src/routes/auth/sign_in.rs

@@ -4,14 +4,17 @@ 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::ResponseError;
+use crate::routes::schema::{IntoResponseAsError, ResponseError};
-use crate::{utility, AppState};
+use crate::{AppState, utility};
 use actix_web::{post, web};
 use diesel::SaveChangesDsl;
 use std::ops::DerefMut;
 use web::Json;
 
-async fn sign_in(data: SignInData, app_state: &web::Data<AppState>) -> Response {
+async fn sign_in(
+    data: SignInData,
+    app_state: &web::Data<AppState>,
+) -> Result<UserResponse, ErrorCode> {
     let user = match &data {
         Default(data) => driver::users::get_by_username(&app_state.database, &data.username),
         Vk(id) => driver::users::get_by_vk_id(&app_state.database, *id),
@@ -23,11 +26,11 @@ async fn sign_in(data: SignInData, app_state: &web::Data<AppState>) -> Response
                 match bcrypt::verify(&data.password, &user.password) {
                     Ok(result) => {
                         if !result {
-                            return ErrorCode::IncorrectCredentials.into();
+                            return Err(ErrorCode::IncorrectCredentials);
                         }
                     }
                     Err(_) => {
-                        return ErrorCode::IncorrectCredentials.into();
+                        return Err(ErrorCode::IncorrectCredentials);
                     }
                 }
             }
@@ -40,10 +43,10 @@ async fn sign_in(data: SignInData, app_state: &web::Data<AppState>) -> Response
             user.save_changes::<User>(conn)
                 .expect("Failed to update user");
 
-            UserResponse::from(&user).into()
+            Ok(user.into())
         }
 
-        Err(_) => ErrorCode::IncorrectCredentials.into(),
+        Err(_) => Err(ErrorCode::IncorrectCredentials),
     }
 }
 
@@ -53,7 +56,7 @@ async fn sign_in(data: SignInData, app_state: &web::Data<AppState>) -> Response
 ))]
 #[post("/sign-in")]
 pub async fn sign_in_default(data: Json<Request>, app_state: web::Data<AppState>) -> Response {
-    sign_in(Default(data.into_inner()), &app_state).await
+    sign_in(Default(data.into_inner()), &app_state).await.into()
 }
 
 #[utoipa::path(responses(
@@ -65,14 +68,15 @@ pub async fn sign_in_vk(data_json: Json<vk::Request>, app_state: web::Data<AppSt
     let data = data_json.into_inner();
 
     match parse_vk_id(&data.access_token) {
-        Ok(id) => sign_in(Vk(id), &app_state).await,
+        Ok(id) => sign_in(Vk(id), &app_state).await.into(),
-        Err(_) => ErrorCode::InvalidVkAccessToken.into(),
+        Err(_) => ErrorCode::InvalidVkAccessToken.into_response(),
     }
 }
 
 mod schema {
+    use crate::routes::schema::PartialStatusCode;
     use crate::routes::schema::user::UserResponse;
-    use crate::routes::schema::{HttpStatusCode, IResponse};
+    use actix_macros::IntoResponseError;
     use actix_web::http::StatusCode;
     use serde::{Deserialize, Serialize};
 
@@ -95,9 +99,9 @@ mod schema {
         }
     }
 
-    pub type Response = IResponse<UserResponse, ErrorCode>;
+    pub type Response = crate::routes::schema::Response<UserResponse, ErrorCode>;
 
-    #[derive(Serialize, utoipa::ToSchema, Clone)]
+    #[derive(Serialize, utoipa::ToSchema, Clone, IntoResponseError)]
     #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
     #[schema(as = SignIn::ErrorCode)]
     pub enum ErrorCode {
@@ -105,7 +109,7 @@ mod schema {
         InvalidVkAccessToken,
     }
 
-    impl HttpStatusCode for ErrorCode {
+    impl PartialStatusCode for ErrorCode {
         fn status_code(&self) -> StatusCode {
             StatusCode::NOT_ACCEPTABLE
         }

src/routes/auth/sign_up.rs

@@ -3,16 +3,19 @@ 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::ResponseError;
 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(data: SignUpData, app_state: &web::Data<AppState>) -> Response {
+async fn sign_up(
+    data: SignUpData,
+    app_state: &web::Data<AppState>,
+) -> Result<UserResponse, ErrorCode> {
     // If user selected forbidden role.
     if data.role == UserRole::Admin {
-        return ErrorCode::DisallowedRole.into();
+        return Err(ErrorCode::DisallowedRole);
     }
 
     // If specified group doesn't exist in schedule.
@@ -20,26 +23,26 @@ async fn sign_up(data: SignUpData, app_state: &web::Data<AppState>) -> Response
 
     if let Some(schedule) = &*schedule_opt {
         if !schedule.data.groups.contains_key(&data.group) {
-            return ErrorCode::InvalidGroupName.into();
+            return Err(ErrorCode::InvalidGroupName);
         }
     }
 
     // If user with specified username already exists.
     if driver::users::contains_by_username(&app_state.database, &data.username) {
-        return ErrorCode::UsernameAlreadyExists.into();
+        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.database, id) {
-            return ErrorCode::VkAlreadyExists.into();
+            return Err(ErrorCode::VkAlreadyExists);
         }
     }
 
     let user = data.into();
     driver::users::insert(&app_state.database, &user).unwrap();
 
-    UserResponse::from(&user).into()
+    Ok(UserResponse::from(&user)).into()
 }
 
 #[utoipa::path(responses(
@@ -62,6 +65,7 @@ pub async fn sign_up_default(data_json: Json<Request>, app_state: web::Data<AppS
         &app_state,
     )
     .await
+    .into()
 }
 
 #[utoipa::path(responses(
@@ -69,47 +73,44 @@ pub async fn sign_up_default(data_json: Json<Request>, app_state: web::Data<AppS
     (status = NOT_ACCEPTABLE, body = ResponseError<ErrorCode>)
 ))]
 #[post("/sign-up-vk")]
-pub async fn sign_up_vk(
+pub async fn sign_up_vk(data_json: Json<vk::Request>, app_state: web::Data<AppState>) -> Response {
-    data_json: Json<vk::Request>,
-    app_state: web::Data<AppState>,
-) -> Response {
     let data = data_json.into_inner();
 
     match parse_vk_id(&data.access_token) {
-        Ok(id) => {
+        Ok(id) => sign_up(
-            sign_up(
+            SignUpData {
-                SignUpData {
+                username: data.username,
-                    username: data.username,
+                password: rng()
-                    password: rng()
+                    .sample_iter(&rand::distr::Alphanumeric)
-                        .sample_iter(&rand::distr::Alphanumeric)
+                    .take(16)
-                        .take(16)
+                    .map(char::from)
-                        .map(char::from)
+                    .collect(),
-                        .collect(),
+                vk_id: Some(id),
-                    vk_id: Some(id),
+                group: data.group,
-                    group: data.group,
+                role: data.role,
-                    role: data.role,
+                version: data.version,
-                    version: data.version,
+            },
-                },
+            &app_state,
-                &app_state,
+        )
-            )
+        .await
-            .await
+        .into(),
-        }
         Err(err) => {
             if err != Error::Expired {
                 eprintln!("Failed to parse vk id token!");
                 eprintln!("{:?}", err);
             }
 
-            ErrorCode::InvalidVkAccessToken.into()
+            ErrorCode::InvalidVkAccessToken.into_response()
         }
     }
 }
 
 mod schema {
     use crate::database::models::{User, UserRole};
+    use crate::routes::schema::PartialStatusCode;
     use crate::routes::schema::user::UserResponse;
-    use crate::routes::schema::{HttpStatusCode, IResponse};
     use crate::utility;
+    use actix_macros::{IntoResponseError, StatusCode};
     use actix_web::http::StatusCode;
     use objectid::ObjectId;
     use serde::{Deserialize, Serialize};
@@ -156,9 +157,10 @@ mod schema {
         }
     }
 
-    pub type Response = IResponse<UserResponse, ErrorCode>;
+    pub type Response = crate::routes::schema::Response<UserResponse, ErrorCode>;
 
-    #[derive(Clone, Serialize, utoipa::ToSchema)]
+    #[derive(Clone, Serialize, utoipa::ToSchema, IntoResponseError, StatusCode)]
+    #[status_code = "StatusCode::NOT_ACCEPTABLE"]
     #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
     #[schema(as = SignUp::ErrorCode)]
     pub enum ErrorCode {
@@ -169,12 +171,6 @@ mod schema {
         VkAlreadyExists,
     }
 
-    impl HttpStatusCode for ErrorCode {
-        fn status_code(&self) -> StatusCode {
-            StatusCode::NOT_ACCEPTABLE
-        }
-    }
-
     /// Internal
 
     pub struct SignUpData {

src/routes/mod.rs

@@ -1,3 +1,4 @@
 pub mod auth;
 pub mod users;
+pub mod schedule;
 mod schema;

src/routes/schedule/get_schedule.rs

@@ -0,0 +1,38 @@
+use self::schema::*;
+use crate::app_state::AppState;
+use crate::routes::schedule::schema::{Error, 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 get_schedule(app_state: web::Data<AppState>) -> Response {
+    match ScheduleView::try_from(app_state.get_ref()) {
+        Ok(res) => Ok(res).into(),
+        Err(e) => match e {
+            Error::NoSchedule => ErrorCode::NoSchedule.into_response(),
+        },
+    }
+}
+
+mod schema {
+    use crate::routes::schedule::schema::ScheduleView;
+    use actix_macros::{IntoResponseErrorNamed, StatusCode};
+    use derive_more::Display;
+    use serde::Serialize;
+    use utoipa::ToSchema;
+
+    pub type Response = crate::routes::schema::Response<ScheduleView, ErrorCode>;
+
+    #[derive(Clone, Serialize, ToSchema, StatusCode, Display, IntoResponseErrorNamed)]
+    #[status_code = "actix_web::http::StatusCode::SERVICE_UNAVAILABLE"]
+    #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+    #[schema(as = ScheduleView::ErrorCode)]
+    pub enum ErrorCode {
+        #[display("Schedule not parsed yet")]
+        NoSchedule,
+    }
+}

src/routes/schedule/mod.rs

@@ -0,0 +1,2 @@
+pub mod get_schedule;
+mod schema;

src/routes/schedule/schema.rs

@@ -0,0 +1,47 @@
+use crate::app_state::AppState;
+use crate::parser::schema::ScheduleEntry;
+use chrono::{DateTime, Utc};
+use serde::Serialize;
+use std::collections::HashMap;
+use utoipa::ToSchema;
+
+#[derive(Serialize, ToSchema)]
+pub struct ScheduleView {
+    etag: String,
+    replacer_id: Option<String>,
+    uploaded_at: DateTime<Utc>,
+    downloaded_at: DateTime<Utc>,
+    groups: HashMap<String, ScheduleEntry>,
+    teachers: HashMap<String, ScheduleEntry>,
+    updated_groups: Vec<Vec<i32>>,
+    updated_teachers: Vec<Vec<i32>>,
+}
+
+pub enum Error {
+    NoSchedule,
+}
+
+impl TryFrom<&AppState> for ScheduleView {
+    type Error = Error;
+
+    fn try_from(app_state: &AppState) -> Result<Self, Self::Error> {
+        let schedule_lock = app_state.schedule.lock().unwrap();
+
+        if let Some(schedule_ref) = schedule_lock.as_ref() {
+            let schedule = schedule_ref.clone();
+
+            Ok(Self {
+                etag: schedule.etag,
+                replacer_id: None,
+                uploaded_at: schedule.updated_at,
+                downloaded_at: schedule.parsed_at,
+                groups: schedule.data.groups,
+                teachers: schedule.data.teachers,
+                updated_groups: vec![],
+                updated_teachers: vec![],
+            })
+        } else {
+            Err(Error::NoSchedule)
+        }
+    }
+}

src/routes/schema.rs

@@ -3,51 +3,45 @@ 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 IResponse<T, E>(pub Result<T, E>)
+pub struct Response<T, E>(pub Result<T, E>)
 where
     T: Serialize + PartialSchema,
-    E: Serialize + PartialSchema + Clone + HttpStatusCode;
+    E: Serialize + PartialSchema + Clone + PartialStatusCode;
 
-impl<T, E> Into<Result<T, E>> for IResponse<T, E>
+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 + HttpStatusCode,
+    E: Serialize + PartialSchema + Clone + PartialStatusCode,
 {
     fn into(self) -> Result<T, E> {
         self.0
     }
 }
 
-impl<T, E> From<E> for IResponse<T, E>
+/// 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 + HttpStatusCode,
+    E: Serialize + PartialSchema + Clone + PartialStatusCode,
 {
-    fn from(value: E) -> Self {
+    fn from(value: Result<T, E>) -> Self {
-        IResponse(Err(value))
+        Response(value)
     }
 }
 
-pub trait HttpStatusCode {
+/// Serialize Response<T, E>
-    fn status_code(&self) -> StatusCode;
+impl<T, E> Serialize for Response<T, E>
-}
-
-impl<T, E> IResponse<T, E>
 where
     T: Serialize + PartialSchema,
-    E: Serialize + PartialSchema + Clone + HttpStatusCode,
+    E: Serialize + PartialSchema + Clone + PartialStatusCode + Into<ResponseError<E>>,
-{
-    pub fn new(result: Result<T, E>) -> Self {
-        IResponse(result)
-    }
-}
-
-impl<T, E> Serialize for IResponse<T, E>
-where
-    T: Serialize + PartialSchema,
-    E: Serialize + PartialSchema + Clone + HttpStatusCode,
 {
     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
     where
@@ -55,15 +49,17 @@ where
     {
         match &self.0 {
             Ok(ok) => serializer.serialize_some::<T>(&ok),
-            Err(err) => serializer.serialize_some::<ResponseError<E>>(&ResponseError::new(err)),
+            Err(err) => serializer
+                .serialize_some::<ResponseError<E>>(&ResponseError::<E>::from(err.clone().into())),
         }
     }
 }
 
-impl<T, E> Responder for IResponse<T, E>
+/// Transform Response<T, E> to HttpResponse<String>
+impl<T, E> Responder for Response<T, E>
 where
     T: Serialize + PartialSchema,
-    E: Serialize + PartialSchema + Clone + HttpStatusCode,
+    E: Serialize + PartialSchema + Clone + PartialStatusCode + Into<ResponseError<E>>,
 {
     type Body = EitherBody<String>;
 
@@ -91,25 +87,36 @@ where
     }
 }
 
+/// 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> {
-    code: T,
+    pub code: T,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub message: Option<String>,
 }
 
-impl<T: Serialize + PartialSchema + Clone> ResponseError<T> {
+pub trait IntoResponseAsError<T>
-    fn new(status_code: &T) -> Self {
+where
-        ResponseError {
+    T: Serialize + PartialSchema,
-            code: status_code.clone(),
+    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::{IntoIResponse, ResponderJson};
+    use actix_macros::ResponderJson;
     use serde::Serialize;
 
-    #[derive(Serialize, utoipa::ToSchema, IntoIResponse, ResponderJson)]
+    /// UserResponse
+    ///
+    /// Uses for stripping sensitive fields (password, fcm, etc.) from response.
+    #[derive(Serialize, utoipa::ToSchema, ResponderJson)]
     #[serde(rename_all = "camelCase")]
     pub struct UserResponse {
         #[schema(examples("67dcc9a9507b0000772744a2"))]
@@ -132,6 +139,7 @@ pub mod user {
         access_token: String,
     }
 
+    /// Create UserResponse from User ref.
     impl From<&User> for UserResponse {
         fn from(user: &User) -> Self {
             UserResponse {
@@ -145,6 +153,7 @@ pub mod user {
         }
     }
 
+    /// Transform User to UserResponse.
     impl From<User> for UserResponse {
         fn from(user: User) -> Self {
             UserResponse {