Fix to let tpa_hint url have ? instead of &

Now the url could also be of the form
?next=/dashboard?tpa_hint=oa2-google-oauth2
to be backward compatible with old url.

VAN-42

src/data/utils/dataUtils.js

@@ -25,3 +25,18 @@ export const getTpaProvider = (tpaHintProvider, primaryProviders, secondaryProvi
   }
   return tpaProvider;
 };
+
+export const processTpaHintURL = (params) => {
+  let tpaHint = null;
+  tpaHint = params.get('tpa_hint');
+  if (!tpaHint) {
+    const next = params.get('next');
+    if (next) {
+      const index = next.indexOf('tpa_hint=');
+      if (index !== -1) {
+        tpaHint = next.substring(index + 'tpa_hint='.length, next.length);
+      }
+    }
+  }
+  return tpaHint;
+};

src/data/utils/index.js

@@ -1,2 +1,2 @@
-export { default, getTpaProvider } from './dataUtils';
+export { default, getTpaProvider, processTpaHintURL } from './dataUtils';
 export { default as AsyncActionType } from './reduxUtils';