Setting Up Google Sign-Auth

Step 1: Google Cloud Console Setup

Go to Google Cloud Console.
Create a project if you don’t already have one.
In the search bar (top center), type “Credentials” and select Credentials under “Products & Pages”.
Click the Create Credentials button.
Select OAuth Client ID from the pop-up window.
Choose the appropriate Application Type (iOS, Web, or Android).

We will now proceed with platform-specific setup instructions.

Step 2: iOS Setup

Select iOS under the Application Type dropdown.
Enter a name (e.g., “iOS OAuth”) and your app’s Bundle ID (found in ios/Runner/Info.plist under the CFBundleIdentifier tag).
Click the Create button.

Add to Info.plist:

<array>
 <dict>
  <key>CFBundleTypeRole</key>
  <string>Editor</string>
  <key>CFBundleURLSchemes</key>
  <array>
   <string>com.googleusercontent.apps.***YOUR_CLIENT_ID***</string>
  </array>
 </dict>
</array>

Replace YOUR_CLIENT_ID with the generated Client ID.

Step 3: Web Setup

Select Web application under the Application Type dropdown.
Enter a name (e.g., “Web OAuth”).
Add Authorized JavaScript origins and Authorized redirect URIs:
- Use http://localhost for local debugging.
- Use https://yourdomain.com for production.
Click Create to generate your Client ID.

Step 4: Android Setup

Select Android under the Application Type dropdown.
Enter a name (e.g., “Android OAuth Debug” for debugging and “Android OAuth Release” for production).

Obtain SHA-1 Keys:

Navigate to the android folder in your project:
```
cd android
```
Run the following command to generate SHA-1 keys:
```
./gradlew signInReport
```
Use the appropriate SHA-1 key for both debug and release configurations.

Update build.gradle:

In android/build.gradle, add:

classpath 'com.google.gms:google-services:4.3.15'

In android/app/build.gradle, add:

implementation 'com.google.android.gms:play-services-auth:20.4.1'

Configure Signing Configurations:

Save the key.jks file inside the android/app/ directory of your Flutter project.
Update android/app/build.gradle to include signing configurations:

android {
    signingConfigs {
        debug {
            storeFile file('key.jks') 
            storePassword 'android'
            keyAlias 'androiddebugkey'
            keyPassword 'android'
        }
        release {
            storeFile file('key.jks') 
            storePassword 'android'
            keyAlias 'androiddebugkey'
            keyPassword 'android'
        }
    }

    buildTypes {
        debug {
            signingConfig = signingConfigs.debug
        }
        release {
            signingConfig = signingConfigs.release
        }
    }
}