Filter auth methods by multi auth support

pages/login.js

@@ -39,9 +39,20 @@ export async function getServerSideProps ({ req, res, query: { callbackUrl, mult
     }
   }
 
+  const providers = await getProviders()
+  if (multiAuth) {
+    // multi auth only supported for login with lightning and nostr
+    const multiAuthSupport = key => ['lightning', 'nostr'].includes(key)
+    Object.keys(providers).forEach(key => {
+      if (!multiAuthSupport(key)) {
+        delete providers[key]
+      }
+    })
+  }
+
   return {
     props: {
-      providers: await getProviders(),
+      providers,
       callbackUrl,
       error,
       multiAuth