[server] Minor performance improvement to generic auth provider

Author: geropl

components/server/src/auth/generic-auth-provider.ts

@@ -238,8 +238,13 @@ export class GenericAuthProvider implements AuthProvider {
         }
     }
 
+    protected cachedAuthCallbackPath: string | undefined = undefined;
     get authCallbackPath() {
-        return new URL(this.oauthConfig.callBackUrl).pathname;
+        // This ends up being called quite often so we cache the URL constructor
+        if (this.cachedAuthCallbackPath === undefined) {
+            this.cachedAuthCallbackPath = new URL(this.oauthConfig.callBackUrl).pathname;
+        }
+        return this.cachedAuthCallbackPath;
     }