Redirect starter links to the desired integration manager

When not using Scalar for the integrations manager, the scalar_token in Riot may not be valid for scalar.vector.im, leading to authentication problems. Starter links should instead point to the desired integrations manager where the token is more likely to be valid.

Signed-off-by: Travis Ralston <travpc@gmail.com>

src/ScalarAuthClient.js

@@ -90,6 +90,11 @@ class ScalarAuthClient {
     }
 
     getStarterLink(starterLinkUrl) {
+        // If the starter link points to Scalar, but the integrations manager isn't scalar, redirect accordingly.
+        // The integration manager is responsible for maintaining the starter link route.
+        let scalarUrl = SdkConfig.get().integrations_rest_url;
+        if (!starterLinkUrl.startsWith(scalarUrl) && starterLinkUrl.startsWith("https://scalar.vector.im/api"))
+            starterLinkUrl = scalarUrl + starterLinkUrl.substring("https://scalar.vector.im/api".length);
         return starterLinkUrl + "?scalar_token=" + encodeURIComponent(this.scalarToken);
     }
 }