fix: add PKCE parameters for PAIA auth

src/app/modules/auth/paia/authorization-request-handler.ts

@@ -22,6 +22,7 @@ import {
   StringMap,
   AuthorizationError,
   AuthorizationErrorJson,
+  BUILT_IN_PARAMETERS,
 } from '@openid/appauth';
 import {Browser} from 'ionic-appauth';
 import {PAIAAuthorizationNotifier} from './paia-authorization-notifier';
@@ -41,8 +42,6 @@ const AUTHORIZATION_REQUEST_HANDLE_KEY =
   'appauth_current_authorization_request';
 export const AUTHORIZATION_RESPONSE_KEY = 'auth_response';
 
-// TODO: PAIA specific ...!!! use whatever you can from the parent class !
-
 export class PAIAAuthorizationRequestHandler {
   notifier: PAIAAuthorizationNotifier;
 
@@ -208,6 +207,18 @@ export class PAIAAuthorizationRequestHandler {
       scope: request.scope,
     };
 
+    // copy over extras
+    if (request.extras) {
+      for (const extra in request.extras) {
+        if (
+          request.extras.hasOwnProperty(extra) && // check before inserting to requestMap
+          !BUILT_IN_PARAMETERS.includes(extra)
+        ) {
+          requestMap[extra] = request.extras[extra];
+        }
+      }
+    }
+
     const query = this.utils.stringify(requestMap);
     const baseUrl = configuration.authorizationEndpoint;
 

src/app/modules/auth/paia/token-request-handler.ts

@@ -65,7 +65,8 @@ export class PAIATokenRequestHandler {
       method: 'POST',
       data: {
         patron: request.patron,
-        grant_type: 'client_credentials',
+        grant_type: 'authorization_code',
+        ...request.toStringMap(),
       },
       headers: {
         'Authorization': `Basic ${request.code}`,