twitter.py 文件源码

def get_access_token(force=False):
    """Tries to obtain access token from memcache and, if it fails,
    obtains a new set and stores in memcache.

    See https://dev.twitter.com/oauth/application-only.

    Deleting the memcache key `access_token` will trigger a token refresh.
    """
    token = memcache.get('access_token')
    if force or token is None:
        logging.warning('Needed to fetch access_token')
        encoded_key = urllib.quote_plus(CUSTOMER_KEY)
        encoded_secret = urllib.quote_plus(CUSTOMER_SECRET)
        encoded_credentials = base64.b64encode(
            "{}:{}".format(encoded_key, encoded_secret))
        response = urlfetch.fetch(
            'https://api.twitter.com/oauth2/token',
            payload='grant_type=client_credentials',
            method=urlfetch.POST,
            headers={'Authorization': 'Basic ' + encoded_credentials})
        if response.status_code == urlfetch.httplib.OK:
            response_data = json.loads(response.content)
            token = response_data['access_token']
            memcache.set('access_token', token, 2592000)  # 30 days
    return token