storkit: merge 448_story_send_oauth_login_link_via_chat_when_credentials_are_missing

server/src/llm/oauth.rs

@@ -161,10 +161,43 @@ pub async fn refresh_access_token() -> Result<(), String> {
     Ok(())
 }
 
+/// Extract the OAuth login URL from an error message produced by the Claude Code provider.
+///
+/// The provider returns errors like:
+/// `"OAuth session expired or credentials missing. Please log in: http://localhost:3001/oauth/authorize"`
+///
+/// Returns the URL portion when the error indicates missing or expired credentials,
+/// `None` otherwise.
+pub fn extract_login_url_from_error(err: &str) -> Option<&str> {
+    let marker = "Please log in: ";
+    let start = err.find(marker)?;
+    Some(err[start + marker.len()..].trim())
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
 
+    #[test]
+    fn extract_login_url_from_oauth_error() {
+        let err = "OAuth session expired or credentials missing. Please log in: http://localhost:3001/oauth/authorize";
+        let url = extract_login_url_from_error(err);
+        assert_eq!(url, Some("http://localhost:3001/oauth/authorize"));
+    }
+
+    #[test]
+    fn extract_login_url_returns_none_for_unrelated_error() {
+        let err = "Some other error occurred";
+        assert!(extract_login_url_from_error(err).is_none());
+    }
+
+    #[test]
+    fn extract_login_url_with_different_port() {
+        let err = "OAuth session expired or credentials missing. Please log in: http://localhost:3002/oauth/authorize";
+        let url = extract_login_url_from_error(err);
+        assert_eq!(url, Some("http://localhost:3002/oauth/authorize"));
+    }
+
     #[test]
     fn parse_credentials_file() {
         let json = r#"{