added signin endpoint

src/main.rs

@@ -1,16 +1,28 @@
 use axum::{
-    extract::{Query, State},
+    extract::State,
     http::StatusCode,
     response::IntoResponse,
     routing::{get, post},
     Json, Router,
 };
+use jsonwebtoken::{EncodingKey, Header};
 use serde::{Deserialize, Serialize};
 use serde_json::json;
 use sqlx::postgres::PgPoolOptions;
 use sqlx::PgPool;
 use std::net::SocketAddr;
 
+#[derive(Clone, Serialize, Deserialize, Debug, Hash)]
+struct Claims {
+    username: String,
+}
+
+#[derive(Clone)]
+struct AppState {
+    db_pool: PgPool,
+    jwt_key: EncodingKey,
+}
+
 #[tokio::main]
 async fn main() {
     // initialize tracing
@@ -21,6 +33,8 @@ async fn main() {
     let db_url = std::env::var("DATABASE_URL")
         .expect("Set `DATABASE_URL` to the url of the postgres database.");
 
+    let jwt_secret = std::env::var("SAAPI_JWT_SECRET").unwrap_or("Sdb\\y5PP`,hmG+98".into());
+
     let pool = PgPoolOptions::new()
         .max_connections(50)
         .connect(&db_url)
@@ -33,7 +47,11 @@ async fn main() {
         .route("/", get(root))
         // `POST /users` goes to `create_user`
         .route("/user/signup", post(signup))
-        .with_state(pool);
+        .route("/user/signin", post(signin))
+        .with_state(AppState {
+            db_pool: pool,
+            jwt_key: EncodingKey::from_secret(jwt_secret.as_bytes()),
+        });
 
     // run our app with hyper
     // `axum::Server` is a re-export of `hyper::Server`
@@ -50,7 +68,10 @@ async fn root() -> &'static str {
     "Hello, World!"
 }
 
-async fn signup(State(pool): State<PgPool>, Json(signup): Json<Signup>) -> impl IntoResponse {
+async fn signup(
+    State(app_state): State<AppState>,
+    Json(signup): Json<Signup>,
+) -> impl IntoResponse {
     // insert your application logic here
     let pass_hash = sha256::digest(&*signup.password);
 
@@ -63,7 +84,7 @@ RETURNING id;
         signup.username,
         pass_hash.as_bytes(),
     )
-    .fetch_one(&pool)
+    .fetch_one(&app_state.db_pool)
     .await;
 
     match result {
@@ -92,13 +113,75 @@ RETURNING id;
     }
 }
 
-// the input to our `create_user` handler
+async fn signin(
+    State(app_state): State<AppState>,
+    Json(signin): Json<Signin>,
+) -> impl IntoResponse {
+    let pass_hash = sha256::digest(&*signin.password);
+
+    let result = sqlx::query!(
+        r#"
+            SELECT username
+            FROM users
+            WHERE username = $1 AND password = $2
+        "#,
+        signin.username,
+        pass_hash.as_bytes(),
+    )
+    .fetch_optional(&app_state.db_pool)
+    .await;
+
+    match result {
+        Ok(Some(user)) => {
+            let claims = Claims {
+                username: user.username,
+            };
+            let token = match jsonwebtoken::encode(&Header::default(), &claims, &app_state.jwt_key)
+            {
+                Ok(token) => token,
+                Err(err) => {
+                    return (
+                        StatusCode::INTERNAL_SERVER_ERROR,
+                        Json(json!({
+                            "error": format!("Unknown error signing in when creating JWT: {}", err)
+                        })),
+                    )
+                }
+            };
+
+            return (StatusCode::OK, Json(json!({ "data": token })));
+        }
+        Ok(None) => {
+            return (
+                StatusCode::UNAUTHORIZED,
+                Json(json!({
+                    "error": format!("Incorrect username or password")
+                })),
+            )
+        }
+        Err(err) => {
+            return (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(json!({
+                    "error": format!("Unknown error signing in: {}", err)
+                })),
+            )
+        }
+    }
+}
+
 #[derive(Clone, Debug, Deserialize)]
 struct Signup {
     username: String,
     password: String,
 }
 
+#[derive(Clone, Debug, Deserialize)]
+struct Signin {
+    username: String,
+    password: String,
+}
+
 // the output to our `create_user` handler
 #[derive(Serialize, sqlx::FromRow)]
 struct User {