Unable to access BigQuery from local App Engine development server

Question

This is specifically a question relating to server to server authorisation between a python Google AppEngine app and Google\'s BigQuery, but could be relevant for other clou

Answer 1

Is it possible to get the App Engine local development server to authenticate with the remote BigQuery service?

I think it's impossible to use AppAssertionCredentials as authentication method between BigQuery service and your local App Engine server currently.

Alternatively, I'm using OAuth2 authentication which is associated with specific user(this user must be registered in your project at google api console) to access BigQuery from local App Engine server.

For getting user OAuth2 authentication, I use oauth2client.client module in the app code.

I hope this will be helpful to your problem.

Updated:

This is what I'm doing for getting the user OAuth2 authorization.

Edited:

Added missing import statement. Thanks mattes!

import os
import webapp2
import httplib2
from oauth2client.client import OAuth2Credentials
from oauth2client.appengine import StorageByKeyName, CredentialsModel, OAuth2DecoratorFromClientSecrets
from google.appengine.api import users

oauth2_decorator = OAuth2DecoratorFromClientSecrets(
    os.path.join(os.path.dirname(__file__), 'client_secrets.json'),
    scope='https://www.googleapis.com/auth/bigquery')
oauth2_decorator._kwargs = {'approval_prompt': 'force'}


class TestPage(webapp2.RequestHandler):
  @oauth2_decorator.oauth_required
  def get(self):
    user_id = users.get_current_user().user_id()
    credentials = StorageByKeyName(CredentialsModel, user_id, 'credentials').locked_get()
    http = credentials.authorize(httplib2.Http()) # now you can use this http object to access BigQuery service


application = webapp2.WSGIApplication([
  ('/', TestPage),
  (oauth2_decorator.callback_path, oauth2_decorator.callback_handler()),
], debug=True)