Firebase authentication with a python Flask backend

firebase_rules.json

{
  /* Visit https://firebase.google.com/docs/database/security to learn more about security rules. */
  "rules": {
    ".read": "auth != null && auth.provider == 'anonymous' && auth.uid == 'SERVICE-ACCOUNT-CLIENT-ID'",
    ".write": "auth != null && auth.provider == 'anonymous' && auth.uid == 'SERVICE-ACCOUNT-CLIENT-ID'"
  }
}

flask-with-firebase.py

from flask import Flask ## basic lib required for flask
import firebase_admin ## firebase admin library
from firebase_admin import credentials ## firebase credentials for authentication
from firebase_admin import db ## firebase db for all operations

## initialize the flask app
app = Flask(__name__)

## initialize the firebase connection using your service account json file.
cred = credentials.Certificate(app.config.get('/local/path/to/firebase/service_account.json'))
firebase_admin.initialize_app(cred, {
    'databaseURL': 'https://your-firbase-db-name.firebaseio.com'
})
## create a reference to the root element.  
## We will use this root in conjunction with .child() for all operations.
FIREBASEDB = db.reference()

@app.route("/demo", methods=['GET'])
def demo_read_write():
  FIREBASEDB.child('/test/doc').push({'testkey':'testvalue'})
  thedoc = FIREBASEDB.child('/test/doc').get()
  return jsonify(thedoc)

if __name__ == "__main__":
  app.run()