From b7c123490a1dad28c84960f00fe206fd8b43f0d4 Mon Sep 17 00:00:00 2001
From: rtkay123 <dev@kanjala.com>
Date: Sat, 11 Apr 2026 11:08:14 +0200
Subject: refactor: reuse structure

---
 crates/api-auth/src/util.rs | 103 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 crates/api-auth/src/util.rs

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

diff --git a/crates/api-auth/src/util.rs b/crates/api-auth/src/util.rs
new file mode 100644
index 0000000..0893bd5
--- /dev/null
+++ b/crates/api-auth/src/util.rs
@@ -0,0 +1,103 @@
+use api_core::models::user::User;
+use async_session::{Session, serde_json};
+use oauth2::{AuthorizationCode, CsrfToken, Scope, TokenResponse};
+use redis::AsyncCommands;
+use serde::{Deserialize, de::DeserializeOwned};
+use sh_util::cache::{CacheKey, RedisManager};
+
+use crate::{BasicClient, CSRF_TOKEN, SessionResponse, client::AuthHttpClient, error::AuthError};
+
+pub async fn create_oauth_session(
+    client: &BasicClient,
+    cache: &RedisManager,
+    scopes: &[&str],
+) -> Result<SessionResponse, AuthError> {
+    let mut builder = client.authorize_url(CsrfToken::new_random);
+
+    for pat in scopes {
+        builder = builder.add_scope(Scope::new(pat.to_string()));
+    }
+    let (auth_url, csrf_token) = builder.url();
+
+    let mut session = Session::new();
+    session.insert(CSRF_TOKEN, &csrf_token).unwrap();
+
+    let cache_key = CacheKey::Session(session.id());
+    let mut cache = cache.get().await.unwrap();
+    cache
+        .set::<_, _, ()>(
+            cache_key,
+            serde_json::to_string(&session).or(Err(AuthError::InvalidSession))?,
+        )
+        .await?;
+    let cookie = session
+        .into_cookie_value()
+        .ok_or(AuthError::MissingSession)?;
+
+    Ok(SessionResponse {
+        cookie_value: cookie,
+        auth_url,
+    })
+}
+
+pub async fn get_user<T>(
+    c: &BasicClient,
+    client: &AuthHttpClient,
+    code: &str,
+    endpoint: &str,
+) -> Result<User, AuthError>
+where
+    User: TryFrom<T>,
+    T: DeserializeOwned,
+{
+    // Get an auth token
+    let token = c
+        .exchange_code(AuthorizationCode::new(code.to_owned()))
+        .request_async(client)
+        .await
+        .map_err(|_e| AuthError::UserToken)?;
+    // Fetch user data from discord
+    let user_data: T = 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
+        .map_err(|_e| AuthError::UserRetrieval)?
+        .json::<T>()
+        .await
+        .map_err(|_e| AuthError::UserDeserialisation)?;
+
+    User::try_from(user_data).map_err(|_e| AuthError::UserDeserialisation)
+}
+
+    pub async fn validate_session(cache: &RedisManager, cookie: &str, state: &str) -> Result<(), AuthError> {
+        let id = Session::id_from_cookie_value(cookie)?;
+        let cache_key = CacheKey::Session(&id);
+        let mut cache = 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 {
+                        Err(AuthError::TokenMismatch)
+                    } else {
+                        Ok(())
+                    }
+                } else {
+                    Err(AuthError::NoCSRFToken)
+                }
+            }
+            None => Err(AuthError::MissingSession),
+        }
+    }
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