1 files changed, 90 insertions, 5 deletions

diff --git a/crates/auth/src/server/routes/authorised.rs b/crates/auth/src/server/routes/authorised.rs
index ddf048d..42bbde2 100644
--- a/crates/auth/src/server/routes/authorised.rs
+++ b/crates/auth/src/server/routes/authorised.rs
@@ -1,23 +1,108 @@
+use std::{str::FromStr, time::Duration};
+
+use anyhow::Context;
 use axum::{
     extract::{Query, State},
-    response::IntoResponse,
+    http::HeaderMap,
+    response::{IntoResponse, Redirect},
 };
 use axum_extra::{TypedHeader, headers};
-use serde::Deserialize;
+use oauth2::{AuthorizationCode, TokenResponse};
+use reqwest::header::SET_COOKIE;
+use serde::{Deserialize, Serialize};
+use sqlx::types::uuid;
+use tower_sessions::{
+    SessionStore,
+    session::{Id, Record},
+};
 
-use crate::{error::AppError, server::routes::Provider, state::AppHandle};
+use crate::{
+    error::AppError,
+    server::{
+        OAUTH_CSRF_COOKIE, csrf_token_validation::csrf_token_validation_workflow, routes::Provider,
+    },
+    state::AppHandle,
+};
 
 #[derive(Debug, Deserialize)]
 pub struct AuthRequest {
     provider: Provider,
     code: String,
-    state: String,
+    pub state: String,
 }
 
+#[derive(Debug, Deserialize, Serialize)]
+struct User {
+    id: String,
+    avatar: Option<String>,
+    username: String,
+    discriminator: String,
+}
+
+/// The cookie to store the session id for user information.
+const SESSION_COOKIE: &str = "info";
+const SESSION_DATA_KEY: &str = "data";
+
 async fn login_authorized(
     Query(query): Query<AuthRequest>,
     State(state): State<AppHandle>,
     TypedHeader(cookies): TypedHeader<headers::Cookie>,
 ) -> Result<impl IntoResponse, AppError> {
-    Ok("")
+    let oauth_session_id = Id::from_str(
+        cookies
+            .get(OAUTH_CSRF_COOKIE)
+            .context("missing session cookie")?,
+    )
+    .unwrap();
+    csrf_token_validation_workflow(&query, &state.session_store, oauth_session_id).await?;
+
+    let client = state.http_client.clone();
+    let store = state.session_store.clone();
+
+    // Get an auth token
+    let token = state
+        .discord_client
+        .exchange_code(AuthorizationCode::new(query.code.clone()))
+        .request_async(&client)
+        .await
+        .context("failed in sending request request to authorization server")?;
+
+    let user_data: User = client
+        // https://discord.com/developers/docs/resources/user#get-current-user
+        .get("https://discordapp.com/api/users/@me")
+        .bearer_auth(token.access_token().secret())
+        .send()
+        .await
+        .context("failed in sending request to target Url")?
+        .json::<User>()
+        .await
+        .context("failed to deserialize response as JSON")?;
+
+    // Create a new session filled with user data
+    let session_id = Id(i128::from_le_bytes(uuid::Uuid::new_v4().to_bytes_le()));
+    store
+        .create(&mut Record {
+            id: session_id,
+            data: [(
+                SESSION_DATA_KEY.to_string(),
+                serde_json::to_value(user_data).unwrap(),
+            )]
+            .into(),
+            expiry_date: time::OffsetDateTime::now_utc()
+                + Duration::from_secs(state.local_config.oauth.session_lifespan),
+        })
+        .await
+        .context("failed in inserting serialized value into session")?;
+
+    // Store session and get corresponding cookie.
+    let cookie = format!("{SESSION_COOKIE}={session_id}; SameSite=Lax; HttpOnly; Secure; Path=/");
+
+    // Set cookie
+    let mut headers = HeaderMap::new();
+    headers.insert(
+        SET_COOKIE,
+        cookie.parse().context("failed to parse cookie")?,
+    );
+
+    Ok((headers, Redirect::to("/")))
 }