auth-backend: read and encode the entire state object in encodeState and readState

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/auth-backend/src/lib/oauth/helpers.ts

@@ -29,18 +29,14 @@ export const readState = (stateString: string): OAuthState => {
   ) {
     throw Error(`Invalid state passed via request`);
   }
-  return {
-    nonce: state.nonce,
-    env: state.env,
-  };
+
+  return state as OAuthState;
 };
 
 export const encodeState = (state: OAuthState): string => {
-  const searchParams = new URLSearchParams();
-  searchParams.append('nonce', state.nonce);
-  searchParams.append('env', state.env);
+  const stateString = new URLSearchParams(state).toString();
 
-  return Buffer.from(searchParams.toString(), 'utf-8').toString('hex');
+  return Buffer.from(stateString, 'utf-8').toString('hex');
 };
 
 export const verifyNonce = (req: express.Request, providerId: string) => {