Подключение к Postgres и тестовый эндпоинт авторизации

src/routes/auth/sign_in.rs

@@ -0,0 +1,26 @@
+use crate::database::models::User;
+use crate::routes::auth::schema::SignInErrCode::IncorrectCredentials;
+use crate::routes::auth::schema::{SignInDto, SignInResult};
+use crate::AppState;
+use actix_web::{post, web};
+use diesel::{ExpressionMethods, QueryDsl, RunQueryDsl, SelectableHelper};
+use std::ops::DerefMut;
+use web::Json;
+
+#[post("/sign-in")]
+pub async fn sign_in(data: Json<SignInDto>, app_state: web::Data<AppState>) -> Json<SignInResult> {
+    use crate::database::schema::users::dsl::*;
+
+    match {
+        let mut lock = app_state.database.lock().unwrap();
+        let connection = lock.deref_mut();
+
+        users
+            .filter(username.eq(data.username.clone()))
+            .select(User::as_select())
+            .first(connection)
+    } {
+        Ok(user) => Json(SignInResult::ok(&user)),
+        Err(_) => Json(SignInResult::err(IncorrectCredentials)),
+    }
+}