chore: cleanup unused backend code after migration to server functions

backend/src/handlers/auth.rs

@@ -1,154 +1,2 @@
-use crate::AppState;
-use axum::{
-    extract::{State, Json},
-    http::StatusCode,
-    response::IntoResponse,
-};
-use serde::{Deserialize, Serialize};
-use utoipa::ToSchema;
-use axum_extra::extract::cookie::{Cookie, CookieJar, SameSite};
-use time::Duration;
-
-#[derive(Deserialize, ToSchema)]
-pub struct LoginRequest {
-    username: String,
-    password: String,
-    #[serde(default)]
-    remember_me: bool,
-}
-
-#[derive(Serialize, ToSchema)]
-pub struct UserResponse {
-    username: String,
-}
-
-#[utoipa::path(
-    post,
-    path = "/api/auth/login",
-    request_body = LoginRequest,
-    responses(
-        (status = 200, description = "Login successful"),
-        (status = 401, description = "Invalid credentials"),
-        (status = 500, description = "Internal server error")
-    )
-)]
-pub async fn login_handler(
-    State(state): State<AppState>,
-    jar: CookieJar,
-    Json(payload): Json<LoginRequest>,
-) -> impl IntoResponse {
-    tracing::info!("Login attempt for user: {}", payload.username);
-
-    let user = match state.db.get_user_by_username(&payload.username).await {
-        Ok(Some(u)) => u,
-        Ok(None) => {
-            tracing::warn!("Login failed: User not found for {}", payload.username);
-            return (StatusCode::UNAUTHORIZED, "Invalid credentials").into_response();
-        }
-        Err(e) => {
-            tracing::error!("DB error during login for {}: {}", payload.username, e);
-            return (StatusCode::INTERNAL_SERVER_ERROR, "Database error").into_response();
-        }
-    };
-
-    let (user_id, password_hash) = user;
-
-    match bcrypt::verify(&payload.password, &password_hash) {
-        Ok(true) => {
-            tracing::info!("Password verified for user: {}", payload.username);
-
-            // Create session
-            let token: String = (0..32).map(|_| {
-                use rand::{distributions::Alphanumeric, Rng};
-                rand::thread_rng().sample(Alphanumeric) as char
-            }).collect();
-
-            // Expiration: 30 days if remember_me is true, else 1 day
-            let expires_in = if payload.remember_me {
-                60 * 60 * 24 * 30
-            } else {
-                60 * 60 * 24
-            };
-
-            let expires_at = time::OffsetDateTime::now_utc().unix_timestamp() + expires_in;
-
-            if let Err(e) = state.db.create_session(user_id, &token, expires_at).await {
-                tracing::error!("Failed to create session for {}: {}", payload.username, e);
-                return (StatusCode::INTERNAL_SERVER_ERROR, "Failed to create session").into_response();
-            }
-
-            let mut cookie = Cookie::build(("auth_token", token))
-                .path("/")
-                .http_only(true)
-                .same_site(SameSite::Lax)
-                .build();
-
-            cookie.set_max_age(Duration::seconds(expires_in));
-
-            tracing::info!("Session created and cookie set for user: {}", payload.username);
-            (StatusCode::OK, jar.add(cookie), Json(UserResponse { username: payload.username })).into_response()
-        }
-        Ok(false) => {
-            tracing::warn!("Login failed: Invalid password for {}", payload.username);
-            (StatusCode::UNAUTHORIZED, "Invalid credentials").into_response()
-        }
-        Err(e) => {
-            tracing::error!("Bcrypt error for {}: {}", payload.username, e);
-            (StatusCode::INTERNAL_SERVER_ERROR, "Auth error").into_response()
-        }
-    }
-}
-
-#[utoipa::path(
-    post,
-    path = "/api/auth/logout",
-    responses(
-        (status = 200, description = "Logged out")
-    )
-)]
-pub async fn logout_handler(
-    State(state): State<AppState>,
-    jar: CookieJar,
-) -> impl IntoResponse {
-    if let Some(token) = jar.get("auth_token") {
-        let _ = state.db.delete_session(token.value()).await;
-    }
-
-    let cookie = Cookie::build(("auth_token", ""))
-        .path("/")
-        .http_only(true)
-        .max_age(Duration::seconds(-1)) // Expire immediately
-        .build();
-
-    (StatusCode::OK, jar.add(cookie), "Logged out").into_response()
-}
-
-#[utoipa::path(
-    get,
-    path = "/api/auth/check",
-    responses(
-        (status = 200, description = "Authenticated", body = UserResponse),
-        (status = 401, description = "Not authenticated")
-    )
-)]
-pub async fn check_auth_handler(
-    State(state): State<AppState>,
-    jar: CookieJar,
-) -> impl IntoResponse {
-    if let Some(token) = jar.get("auth_token") {
-        match state.db.get_session_user(token.value()).await {
-            Ok(Some(user_id)) => {
-                // Fetch username
-                // We need a helper in db.rs to get username by id, or we can use a direct query here if we don't want to change db.rs interface yet.
-                // But better to add `get_username_by_id` to db.rs
-                // For now let's query directly or via a new db method.
-                if let Ok(Some(username)) = state.db.get_username_by_id(user_id).await {
-                     return (StatusCode::OK, Json(UserResponse { username })).into_response();
-                }
-            },
-            _ => {} // Invalid session
-        }
-    }
-
-    StatusCode::UNAUTHORIZED.into_response()
-}
+// This file is intentionally empty as authentication is now handled by Server Functions.
+// See shared/src/server_fns/auth.rs