fix: add more oauth2 checks

crates/core/database/src/models/bots/model.rs

@@ -49,6 +49,7 @@ auto_derived_partial!(
 
 auto_derived!(
     #[derive(Copy, Hash)]
+    #[serde(rename = "lowercase")]
     pub enum OAuth2Scope {
         Identify,
         Full,

crates/core/database/src/util/oauth2.rs

@@ -123,4 +123,14 @@ pub async fn add_code_challange(token: &str, code_challenge: &str) -> Result<()>
     .map_err(|_| create_error!(InternalError))?;
 
     Ok(())
+}
+
+pub async fn get_code_challange(token: &str) -> Result<Option<String>> {
+    let mut conn = redis_kiss::get_connection()
+        .await
+        .map_err(|_| create_error!(InternalError))?;
+
+    conn.get(format!("oauth2:{token}:code_challenge"))
+        .await
+        .map_err(|_| create_error!(InternalError))
 }