Introduction to Google Auth

Google Auth library offers secure and efficient authentication utilizing Google’s services. Here is a comprehensive guide to its APIs which will help you integrate with Google services seamlessly.

API Example: Authentication with OAuth 2.0

from google.oauth2 import id_token
from google.auth.transport import requests

CLIENT_ID = 'YOUR_CLIENT_ID.apps.googleusercontent.com'

def authenticate(token):
    try:
        idinfo = id_token.verify_oauth2_token(token, requests.Request(), CLIENT_ID)

        if idinfo['iss'] not in ['accounts.google.com', 'https://accounts.google.com']:
            raise ValueError('Wrong issuer.')

        user_id = idinfo['sub']
        return user_id

    except ValueError as e:
        print(e)
        return None

API Example: Service Account Authentication

from google.oauth2 import service_account

def authenticate_service_account(json_file_path):
    credentials = service_account.Credentials.from_service_account_file(
        json_file_path,
        scopes=['https://www.googleapis.com/auth/cloud-platform']
    )
    return credentials

API Example: Using Google Auth in an App

from google.auth.transport import requests
import google.auth

def app_authenticate():
    credentials, project = google.auth.default()
    auth_req = requests.Request()
    credentials.refresh(auth_req)
    return credentials

def call_protected_api(credentials):
    headers = {
        'Authorization': 'Bearer ' + credentials.token,
    }
    # Example calling a protected API
    response = requests.get('https://www.googleapis.com/some_protected_api', headers=headers)
    return response

if __name__ == '__main__':
    credentials = app_authenticate()
    response = call_protected_api(credentials)
    print(response.content)

API Example: Google ID Tokens

from google.oauth2 import id_token
from google.auth.transport import requests

token = 'your-id-token'

try:
    id_info = id_token.verify_oauth2_token(token, requests.Request())
    if id_info['iss'] not in ['accounts.google.com', 'https://accounts.google.com']:
        raise ValueError('Wrong issuer.')

    user_id = id_info['sub']
    print(user_id)

except ValueError:
    print('Invalid token')

The above examples show basic authentication methods using different APIs provided in the google-auth library. They demonstrate how to authenticate with OAuth 2.0, service accounts, and verify ID tokens, enabling seamless integration with Google services.

Using google-auth can greatly enhance user experience and security in your applications through these efficient, pre-built methods.

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