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

HTTP_REQUEST = google.auth.transport.requests.Request()
AUDIENCE = os.environ.get('GOOGLE_CLOUD_PROJECT')

def verify_token(headers):
    id_token = headers['Authorization'].split(' ').pop()

    try:
        claims = google.oauth2.id_token.verify_firebase_token(id_token, HTTP_REQUEST, audience=AUDIENCE)
    except:
        return None

    return claims