login for RN app

src/auth/googleSignIn.js

@@ -2,6 +2,32 @@ const GIS_SCRIPT = 'https://accounts.google.com/gsi/client';
 
 let scriptPromise;
 
+/** WebView consoles print objects as [object Object]; always log a string. */
+export function logError(tag, details) {
+  let text;
+  try {
+    text = JSON.stringify(details, errorReplacer, 2);
+  } catch {
+    text = String(details);
+  }
+  console.error(`${tag} ${text}`);
+}
+
+function errorReplacer(_key, value) {
+  if (value instanceof Error) {
+    return {
+      name: value.name,
+      message: value.message,
+      code: value.code,
+      status: value.status,
+      stack: value.stack,
+      cause: value.cause,
+      ...Object.fromEntries(Object.entries(value)),
+    };
+  }
+  return value;
+}
+
 function loadGoogleScript() {
   if (window.google?.accounts?.id) return Promise.resolve();
   if (scriptPromise) return scriptPromise;
@@ -12,7 +38,21 @@ function loadGoogleScript() {
     script.async = true;
     script.defer = true;
     script.onload = () => resolve();
-    script.onerror = () => reject(new Error('Failed to load Google Sign-In'));
+    script.onerror = () => {
+      scriptPromise = null;
+      // <script onerror> does not expose a message; fetch to get a real Error.
+      fetch(GIS_SCRIPT).then(
+        (res) =>
+          reject(
+            new Error(
+              res.ok
+                ? `Failed to execute ${GIS_SCRIPT}`
+                : `Failed to load ${GIS_SCRIPT}: HTTP ${res.status} ${res.statusText}`,
+            ),
+          ),
+        reject,
+      );
+    };
     document.head.appendChild(script);
   });
 
@@ -76,6 +116,7 @@ function clickRenderedGoogleButton(clientId, onCredential) {
 
 /**
  * Prompt for a Google ID token (One Tap, falling back to the sign-in popup).
+ * In Dash Native (`window.__dashHost`), uses the host bridge with the same web OAuth client ID.
  * @param {string} clientId
  * @param {{ onFedcmBlocked?: () => void }} [options]
  */
@@ -84,6 +125,24 @@ export async function requestGoogleIdToken(clientId, { onFedcmBlocked } = {}) {
     throw new Error('Google client ID is not configured');
   }
 
+  const host = window.__dashHost;
+  if (
+    host?.isDashNative === true &&
+    host.googleSignIn === true &&
+    typeof host.requestGoogleIdToken === 'function'
+  ) {
+    try {
+      return await host.requestGoogleIdToken(clientId);
+    } catch (err) {
+      logError('[googleSignIn] native host requestGoogleIdToken failed', {
+        clientId,
+        origin: window.location.origin,
+        error: err,
+      });
+      throw err;
+    }
+  }
+
   await loadGoogleScript();
 
   return new Promise((resolve, reject) => {