From f06288f156ccb8f9ebf35782a179bf57e6bc8fc2 Mon Sep 17 00:00:00 2001
From: rtkay123 <dev@kanjala.com>
Date: Fri, 10 Apr 2026 23:48:24 +0200
Subject: feat(auth): get user

---
 crates/api-auth/src/discord/mod.rs | 77 +++++++++++++++++++++++++++++++++++---
 1 file changed, 71 insertions(+), 6 deletions(-)

(limited to 'crates/api-auth/src/discord/mod.rs')

diff --git a/crates/api-auth/src/discord/mod.rs b/crates/api-auth/src/discord/mod.rs
index 1a7d47d..0844f58 100644
--- a/crates/api-auth/src/discord/mod.rs
+++ b/crates/api-auth/src/discord/mod.rs
@@ -1,12 +1,31 @@
 use api_core::models::user::User;
 use async_session::{Session, serde_json};
 use async_trait::async_trait;
-use oauth2::{CsrfToken, Scope};
+use oauth2::{AuthorizationCode, CsrfToken, Scope, TokenResponse};
 use redis::AsyncCommands;
+use serde::{Deserialize, Serialize};
 use sh_util::cache::{CacheKey, RedisManager};
 use sqlx::PgPool;
 
-use crate::{BasicClient, CSRF_TOKEN, OauthDriver, SessionResponse, error::AuthError};
+use crate::{
+    BasicClient, CSRF_TOKEN, OauthDriver, SessionResponse, client::AuthHttpClient, error::AuthError,
+};
+
+// The user data we'll get back from Discord.
+// https://discord.com/developers/docs/resources/user#user-object-user-structure
+#[derive(Debug, Serialize, Deserialize)]
+struct DiscordUser {
+    id: String,
+    avatar: Option<String>,
+    username: String,
+    discriminator: String,
+}
+
+impl From<DiscordUser> for User {
+    fn from(value: DiscordUser) -> Self {
+        todo!()
+    }
+}
 
 #[derive(Clone)]
 pub struct AuthServiceDiscord {
@@ -27,11 +46,57 @@ impl AuthServiceDiscord {
 
 #[async_trait]
 impl OauthDriver for AuthServiceDiscord {
-    async fn get_auth_token(&self) -> Result<String, AuthError> {
-        todo!()
+    async fn get_user(&self, client: &AuthHttpClient, code: &str) -> Result<User, AuthError> {
+        // Get an auth token
+        let token = self
+            .client
+            .exchange_code(AuthorizationCode::new(code.to_owned()))
+            .request_async(client)
+            .await
+            .unwrap();
+        // Fetch user data from discord
+        let user_data: DiscordUser = 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
+            .unwrap()
+            .json::<DiscordUser>()
+            .await
+            .unwrap();
+
+        Ok(user_data.into())
     }
-    async fn get_user(&self) -> Result<User, AuthError> {
-        todo!()
+    async fn validate_session(&self, cookie: &str, state: &str) -> Result<(), AuthError> {
+        let id = Session::id_from_cookie_value(cookie)?;
+        let cache_key = CacheKey::Session(&id);
+        let mut cache = self.cache.get().await.unwrap();
+        let session = cache.get::<_, String>(&cache_key).await?;
+        let session: Session =
+            serde_json::from_str(&session).map_err(|_e| AuthError::InvalidSession)?;
+
+        match session.validate() {
+            Some(session) => {
+                // Extract the CSRF token from the session
+                let stored_csrf_token = session.get::<CsrfToken>(CSRF_TOKEN);
+
+                if let Some(stored) = stored_csrf_token {
+                    // Cleanup the CSRF token session
+                    cache.del::<_, ()>(cache_key).await?;
+
+                    // Validate CSRF token is the same as the one in the auth request
+                    if *stored.secret() != state {
+                        return Err(AuthError::TokenMismatch);
+                    } else {
+                        return Ok(());
+                    }
+                } else {
+                    return Err(AuthError::NoCSRFToken);
+                }
+            }
+            None => return Err(AuthError::MissingSession),
+        }
     }
     async fn create_oauth_session(&self) -> Result<SessionResponse, AuthError> {
         let (auth_url, csrf_token) = self
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