flutter_facebook_auth_desktop #

The desktop implementation of the flutter_facebook_auth plugin, covering macOS and Windows.

Both platforms use the same approach: because Facebook has no native desktop SDK, the OAuth dialog is loaded in an embedded webview (WKWebView on macOS, WebView2 on Windows) and the navigation to the redirect URL is intercepted to read the access token out of its fragment.

Usage #

This package is endorsed by flutter_facebook_auth, so adding that package is enough — you do not need to depend on facebook_auth_desktop directly.

On desktop you must initialize the plugin with your Facebook app id before calling login():

await FacebookAuth.instance.webAndDesktopInitialize(
  appId: "YOUR_APP_ID",
  cookie: true,
  xfbml: true,
  version: "v18.0",
);

Windows requirements #

The plugin renders the login dialog with the Microsoft Edge WebView2 control.

• At build time the WebView2 SDK is downloaded from NuGet the first time you build, so the first Windows build needs an internet connection. The static loader is linked in, so there is no extra DLL to ship.
• At run time the WebView2 Runtime must be present. It ships with Windows 11 and with current Windows 10 installs; for older machines, bundle the Evergreen Runtime installer with your app. If it is missing, login() fails with a webview2_unavailable platform error.