added frontend for friendships, and fixed logic around conflicts

db/init.sql

@@ -10,7 +10,7 @@ CREATE TABLE IF NOT EXISTS friendship_ (
   user_first  INT NOT NULL REFERENCES user_(id) ON DELETE CASCADE,
   user_second INT NOT NULL REFERENCES user_(id) ON DELETE CASCADE,
   created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-  PRIMARY KEY (user_first, user_second),
+  PRIMARY KEY (user_first, user_second)
 );
 
 CREATE TABLE IF NOT EXISTS friend_request_ (

db/mock_data.sql

@@ -21,3 +21,14 @@ INSERT INTO message_ (sender, room, message_type, content) VALUES
 (2, 2, 'text', 'Anyone seen the new tech updates?'),
 (1, 3, 'image', 'Heres a funny meme I found!'),
 (3, 1, 'text', 'I love how active this room is!');
+
+INSERT INTO friendship_ (user_first, user_second) VALUES
+(1, 3),  -- Alice and Carol
+(2, 3);  -- Bob and Carol
+
+INSERT INTO friend_request_ (sender, receiver) VALUES
+(2, 1);  -- Bob sent a friend request to Alice
+
+INSERT INTO ws_token_ (token, room_id, expires_at) VALUES
+('random_token_1', 1, '2025-12-31T23:59:59Z'),
+('random_token_2', 2, '2025-12-31T23:59:59Z');

src/db.rs

@@ -35,6 +35,14 @@ pub async fn username_from_uuid(
         .map_err(|_| (StatusCode::UNAUTHORIZED, String::from("Wrong token")))
 }
 
+pub async fn username_from_id(db: &PgPool, user_id: i32) -> Result<String, (StatusCode, String)> {
+    sqlx::query_scalar("SELECT username FROM user_ WHERE id = $1")
+        .bind(user_id)
+        .fetch_one(db)
+        .await
+        .map_err(|_| (StatusCode::UNAUTHORIZED, String::from("Wrong token")))
+}
+
 pub async fn id_from_username(db: &PgPool, username: String) -> Result<i32, (StatusCode, String)> {
     sqlx::query_scalar("SELECT id FROM user_ WHERE username = $1")
         .bind(username)

src/routes/friends.rs

@@ -6,7 +6,7 @@ use axum::{
 use sqlx::PgPool;
 use uuid::Uuid;
 
-use crate::db::user_id_from_uuid;
+use crate::db::{user_id_from_uuid, username_from_id, username_from_uuid};
 use crate::{auth::verify_jwt, db::id_from_username};
 
 #[derive(sqlx::FromRow, serde::Serialize)]
@@ -100,7 +100,7 @@ async fn send_request(
     headers: HeaderMap,
     Extension(db): Extension<PgPool>,
     Json(payload): Json<SendFriendRequestPayload>,
-) -> Result<StatusCode, (StatusCode, String)> {
+) -> Result<(StatusCode, Json<FriendRequest>), (StatusCode, String)> {
     let claims = verify_jwt(headers)?;
 
     let sender_id = user_id_from_uuid(&db, claims.sub).await?;
@@ -113,6 +113,28 @@ async fn send_request(
         ));
     }
 
+    let is_already_friend = sqlx::query_scalar::<_, bool>(
+        r#"
+        SELECT EXISTS (
+            SELECT 1 FROM friendship_
+            WHERE (user_first = $1 AND user_second = $2)
+               OR (user_first = $2 AND user_second = $1)
+        )
+        "#,
+    )
+    .bind(sender_id)
+    .bind(receiver_id)
+    .fetch_one(&db)
+    .await
+    .map_err(|_| (StatusCode::INTERNAL_SERVER_ERROR, "Database error".into()))?;
+
+    if is_already_friend {
+        return Err((
+            StatusCode::CONFLICT,
+            "You are already friends with this user".into(),
+        ));
+    }
+
     sqlx::query("INSERT INTO friend_request_ (sender, receiver) VALUES ($1, $2)")
         .bind(sender_id)
         .bind(receiver_id)
@@ -120,14 +142,20 @@ async fn send_request(
         .await
         .map_err(|_| (StatusCode::CONFLICT, "Request already exists".into()))?;
 
-    Ok(StatusCode::CREATED)
+    Ok((
+        StatusCode::CREATED,
+        Json(FriendRequest {
+            sender_uuid: claims.sub,
+            sender_username: username_from_id(&db, receiver_id).await?,
+        }),
+    ))
 }
 
 async fn accept_request(
     headers: HeaderMap,
     Extension(db): Extension<PgPool>,
     Json(payload): Json<AcceptFriendRequestPayload>,
-) -> Result<StatusCode, (StatusCode, String)> {
+) -> Result<(StatusCode, Json<Friend>), (StatusCode, String)> {
     let claims = verify_jwt(headers)?;
 
     let receiver_id = user_id_from_uuid(&db, claims.sub).await?;
@@ -144,7 +172,13 @@ async fn accept_request(
         .await
         .map_err(|_| (StatusCode::INTERNAL_SERVER_ERROR, "DB error".into()))?;
 
-    let rows = sqlx::query("DELETE FROM friend_request_ WHERE sender = $1 AND receiver = $2")
+    let rows = sqlx::query(
+        r#"
+        DELETE FROM friend_request_
+        WHERE sender = $1 AND receiver = $2
+        OR sender = $2 AND receiver = $1
+        "#,
+    )
     .bind(sender_id)
     .bind(receiver_id)
     .execute(&mut *tx)
@@ -170,5 +204,11 @@ async fn accept_request(
         )
     })?;
 
-    Ok(StatusCode::CREATED)
+    Ok((
+        StatusCode::CREATED,
+        Json(Friend {
+            uuid: payload.sender_uuid,
+            username: username_from_uuid(&db, payload.sender_uuid).await?,
+        }),
+    ))
 }