feat(common): use jwt url value for load redirect

Author: chanceaclark

pages/api/load.ts

@@ -1,14 +1,21 @@
 import { NextApiRequest, NextApiResponse } from 'next';
 import { encodePayload, getBCVerify, setSession } from '../../lib/auth';
 
+const buildRedirectUrl = (url: string, encodedContext: string) => {
+    const [path, query = ''] = url.split('?');
+    const queryParams = new URLSearchParams(`context=${encodedContext}&${query}`);
+
+    return `${path}?${queryParams}`;
+}
+
 export default async function load(req: NextApiRequest, res: NextApiResponse) {
     try {
         // Verify when app loaded (launch)
         const session = await getBCVerify(req.query);
         const encodedContext = encodePayload(session); // Signed JWT to validate/ prevent tampering
 
         await setSession(session);
-        res.redirect(302, `/?context=${encodedContext}`);
+        res.redirect(302, buildRedirectUrl(session.url, encodedContext));
     } catch (error) {
         const { message, response } = error;
         res.status(response?.status || 500).json({ message });