Source code for oauth_dropins.meetup

"""Meetup.com drop-in.

API docs:
https://www.meetup.com/meetup_api/
"""
import logging
import urllib.parse

from google.cloud import ndb
from webob import exc

from . import handlers
from .models import BaseAuth
from .webutil import appengine_info, util
from .webutil.util import json_loads

if appengine_info.DEBUG:
    MEETUP_CLIENT_ID = util.read('meetup_client_id_local')
    MEETUP_CLIENT_SECRET = util.read('meetup_client_secret_local')
else:
    MEETUP_CLIENT_ID = util.read('meetup_client_id')
    MEETUP_CLIENT_SECRET = util.read('meetup_client_secret')

GET_AUTH_CODE_URL = '&'.join((
    'https://secure.meetup.com/oauth2/authorize?'
    'client_id=%(client_id)s',
    'response_type=code',
    'redirect_uri=%(redirect_uri)s',
    'scope=%(scope)s',
    'state=%(state)s',
    ))

GET_ACCESS_TOKEN_URL = 'https://secure.meetup.com/oauth2/access'
GET_USER_INFO_URL = 'https://api.meetup.com/members/self/'


[docs]def urlopen_bearer_token(url, access_token, data=None, **kwargs): """Wraps urlopen() and adds OAuth credentials to the request. """ headers = {'Authorization': 'Bearer %s' % access_token} try: return util.urlopen(urllib.request.Request(url, headers=headers, data=data), **kwargs) except BaseException as e: util.interpret_http_exception(e) raise
[docs]class MeetupAuth(BaseAuth): """An authenticated Meetup.com user. Provides methods that return information about this user and make OAuth-signed requests to Meetup's HTTP-based APIs. Stores OAuth credentials in the datastore. See models.BaseAuth for usage details. Implements urlopen() but not http() or api(). """ access_token_str = ndb.StringProperty(required=True) user_json = ndb.TextProperty(required=True)
[docs] def site_name(self): return 'Meetup.com'
[docs] def user_display_name(self): """Returns the Meetup.com user id. """ return json_loads(self.user_json)['name']
[docs] def access_token(self): """Returns the OAuth access token string. """ return self.access_token_str
[docs] def urlopen(self, url, **kwargs): return urlopen_bearer_token(url, self.access_token_str, kwargs)
[docs]class MeetupCsrf(ndb.Model): """Stores a CSRF token for the Meetup.com OAuth2 flow.""" token = ndb.StringProperty(required=False) state = ndb.TextProperty(required=False)
[docs]class StartHandler(handlers.StartHandler): """Starts Meetup.com auth. Requests an auth code and expects a redirect back. """ NAME = 'meetup' LABEL = 'Meetup.com' DEFAULT_SCOPE = ''
[docs] def redirect_url(self, state=None): assert (MEETUP_CLIENT_ID and MEETUP_CLIENT_SECRET), ( "Please fill in the meetup_client_id and meetup_client_secret files in " "your app's root directory.") csrf_key = MeetupCsrf(state=state).put() return GET_AUTH_CODE_URL % { 'client_id': MEETUP_CLIENT_ID, 'redirect_uri': urllib.parse.quote_plus(self.to_url()), 'scope': self.scope, 'state': '%s|%s' % (urllib.parse.quote_plus(state), csrf_key.id()), }
[docs] @classmethod def button_html(cls, *args, **kwargs): return super(cls, cls).button_html( *args, input_style='background-color: #EEEEEE; padding: 10px', **kwargs)
[docs]class CallbackHandler(handlers.CallbackHandler): """The auth callback. Fetches an access token, stores it, and redirects home. """ def get(self): # handle errors error = self.request.get('error') if error: if error == 'access_denied': logging.info('User declined') self.finish(None, state=self.request.get('state')) return else: msg = 'Error: %s: %s' % (error, self.request.get('error_description')) logging.info(msg) raise exc.HTTPBadRequest(msg) state = util.get_required_param(self, 'state') # lookup the CSRF token try: csrf_id = int(urllib.parse.unquote_plus(state).split('|')[-1]) except (ValueError, TypeError): raise exc.HTTPBadRequest('Invalid state value %r' % state) csrf = MeetupCsrf.get_by_id(csrf_id) if not csrf: raise exc.HTTPBadRequest('No CSRF token for id %s' % csrf_id) # extract auth code and request access token auth_code = util.get_required_param(self, 'code') data = { 'code': auth_code, 'client_id': MEETUP_CLIENT_ID, 'client_secret': MEETUP_CLIENT_SECRET, 'grant_type': 'authorization_code', # redirect_uri here must be the same in the oauth code request! # (the value here doesn't actually matter since it's requested server side.) 'redirect_uri': self.request.path_url, } # TODO: handle refresh tokens resp = util.requests_post(GET_ACCESS_TOKEN_URL, data=data) resp.raise_for_status() logging.debug('Access token response: %s', resp) try: data = json_loads(resp.text) except (ValueError, TypeError): logging.error('Bad response:\n%s', resp, stack_info=True) raise exc.HTTPBadRequest('Bad Disqus response to access token request') error = data.get('error') if error: msg = 'Error: %s: %s' % (error[0], data.get('error_description')) logging.info(msg) raise exc.HTTPBadRequest(msg) access_token = data['access_token'] user_json = urlopen_bearer_token(GET_USER_INFO_URL, access_token).read() user = json_loads(user_json) logging.debug('User info response: %s', user) user_id = str(user['id']) logging.info('Storing new Meetup account for ID: %s', user_id) auth = MeetupAuth(id=user_id, access_token_str=access_token, user_json=user_json) auth.put() self.finish(auth, state=csrf.state)