Python script to send push notifications using Firebase Cloud Messaging (FCM) and Google OAuth2.

fcm_push_notifications.py

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

SCOPES = ['https://www.googleapis.com/auth/firebase.messaging']

def get_access_token():
    """Retrieve a valid access token that can be used to authorize requests."""
    credentials = service_account.Credentials.from_service_account_file(
        r'C:\path\to\your\service-account.json', scopes=SCOPES)
    request = google.auth.transport.requests.Request()
    credentials.refresh(request)
    return credentials.token

def get_header():
    return {'Authorization': 'Bearer ' + get_access_token(),
            'Content-Type': 'application/json; UTF-8'}

def send_push_message(recipient_token, data):
    """
    Sends a push message to the specified recipient.

    Args:
        recipient_token (str): The recipient's token.
        data (dict): Dictionary containing message data.

    Returns:
        dict: The response JSON.
    """
    firebase_url = 'https://fcm.googleapis.com/v1/projects/your-project-id/messages:send'
    headers = get_header()

    response = requests.post(firebase_url, headers=headers, json=data)
    return response.json()

# Example usage
recipient_token = 'your_recipient_token_here'
data = {
    "message": {
        "token": recipient_token,
        "notification": {
            "title": "Breaking News!",
            "body": "New news story available."
        },
        "data": {
            "story_id": "story_12345"
        },
        "android": {
            "notification": {
                "click_action": "TOP_STORY_ACTIVITY"
            }
        },
        "apns": {
            "payload": {
                "aps": {
                    "category": "NEW_MESSAGE_CATEGORY"
                }
            }
        }
    }
}

response = send_push_message(recipient_token, data)
print(response)

requirements.txt

requests==2.25.1
google-auth==2.29.0