Unlock the potential of Google, Facebook, Twitter, and Firebase sign-ins seamlessly integrated with Bloc state management. Fortify security, streamline user experience, and empower your app with cutting-edge authentication. 🚀🔐

This guide provides step-by-step instructions on implementing Google Sign-In in your application without relying on Firebase. By following these steps, you can seamlessly integrate Google authentication into your app

1. Add Dependencies Make sure to include the required dependencies in your pubspec.yaml file:

dependencies:
  google_sign_in: ^6.2.1

Run flutter pub get to fetch the new dependencies. 2. Configure OAuth2.0

• Visit the Google Cloud Console.
• Create a new project or select an existing one.
• Navigate to the "Credentials" page.
• Click on "Create Credentials" and choose "OAuth client ID"
• Select "IOS application" as the application type.

Note we will make 2 Credentials IOS and Android

• Select “iOS” under the Application Type dropdown.
• We have to enter a Name. You write whatever you want but I suggest to you write “iOS Oauth”.
• Also we have to enter a “Bundle ID” which is located in “ios/Runner/Info.plist” under the “CFBundleIdentifier” tag.
• Click the “Create” button!
• Info.plist, add these lines of code

<array>
 <dict>
  <key>CFBundleTypeRole</key>
  <string>Editor</string>
  <key>CFBundleURLSchemes</key>
  <array>
   <string>***IF YOU HAVE FACEBOOK SIGN IN CLIENT ID, TYPE HERE***</string>
   <string>com.googleusercontent.apps.***YOUR_CLIENT_ID***</string>
  </array> 
 </dict>
</array>

We need to have more than one OAuth Client ID because we require a different ‘SHA-1 Certificate Fingerprint’ for each device on the Android side. This is necessary for both debug mode (for running on emulators and testing code) and release mode (for generating apk/aab files).

• Select “Android” under the Application Type dropdown.
• We have to enter a Name. You write whatever you want but I suggest to you write for debugging environment “Android OAuth Debug” and for release environment “Android OAuth Release”
• Get debug SHA-1 and release SHA-1
  • Go to project terminal and open android folder (cd android)
  • Write “./gradlew signInReport”. (This gives us the SHA1 keys in our project)
  • We come across a lot of information that includes SHA-1 and SHA-256. We search for the SHA-1 keys with the “Variant” and “Config” values set to “debug”
• Now, go to your project and find build.gradle in android folder and find dependencies. Then, add this line of code.

   dependencies {
    classpath 'com.google.gms:google-services:4.4.0'
}

• Then go to build.gradle in android/app and find dependencies again. Then, add this line of code.

dependencies {
    implementation 'com.google.android.gms:play-services-auth:20.7.0'
}

• Finally, you are ready to go!

4. Implementation

  final GoogleSignIn _googleSignIn = GoogleSignIn(scopes: ['email']);

  @override
  Future<User> signInWithGoogle() async {
    try {
      final GoogleSignInAccount? googleAccount = await _googleSignIn.signIn();
      if (googleAccount != null) {
        final GoogleSignInAuthentication googleAuthentication =
            await googleAccount.authentication;

        return User(
          name: googleAccount.displayName,
          email: googleAccount.email,
          picture: googleAccount.photoUrl,
        );
      }
    } catch (error) {
      print("Error during Google Sign-In: $error");
    }
    return User.empty();
  }

for better understanding head to Google Sign-in File

This guide offers a detailed walkthrough on implementing Facebook Sign-In in your Flutter application without relying on Firebase. By following these steps, you can seamlessly integrate Facebook authentication into your app.

1. Add Dependencies Make sure to include the required dependencies in your pubspec.yaml file:

dependencies:
  flutter_facebook_auth: ^6.0.4

Run flutter pub get to fetch the new dependencies.

2. Configure Facebook App
   • Visit the Flutter Facebook Auth portal and follow the steps it's more than enough.
3. Implementation

Future<User> signInWithFacebook() async {
    try {
      final LoginResult result = await FacebookAuth.instance.login();
      if (result.status == LoginStatus.success) {
        final AccessToken accessToken = result.accessToken!;
        final userData = await FacebookAuth.instance.getUserData();

        return User(
          name: userData["name"],
          email: userData["email"],
          picture: userData["picture"]["data"]["url"],
        );
      } else {
        print("Facebook Sign-In failed. Status: ${result.status}");
        print("Message: ${result.message}");
      }
    } catch (error) {
      print("Error during Facebook Sign-In: $error");
    }
    return User.empty();
  }

for better understanding head to Facebook Sign-in File