client.py 文件源码

def get_access_token(self, renew=False):
    """ Get an access token using your app_id and app_secret.

    You shouldn't need to call this method yourself. If there is no access token yet, this method
    will be called when a request is made. If a token expires, this method will also automatically
    be called to renew the token.

    Args:
      renew: if True, then force the client to get a new token (even if not expired). By default if
      there is already an access token in the client then this method is a no-op.
    """
    if self.access_token is None or renew:
      headers = {}  # don't use json here, juse urlencode.
      url = self._url_for_op('token')
      data = urlencode({'grant_type': 'client_credentials',
                               'client_id':self.CLIENT_ID,
                               'client_secret':self.CLIENT_SECRET})
      data = bytearray(data, 'utf-8')
      req = urllib2.Request(url, data, headers)
      try:
        response = urllib2.urlopen(req).read()
        response = self._parse_response(response)
      except urllib2.HTTPError as e:
        raise ApiError(e.reason)
      except Exception as e:
        raise ApiError(e)
      self.access_token = response['access_token']
    return self.access_token