docs: def is_authenticated(self, request, **kwargs):
          """
          Verify 2-legged oauth request. Parameters accepted as
          values in the "Authorization" header, as a GET request parameter,
          or in a POST body.
          """
          log.info("OAuth20Authentication")
          try:
              key = request.GET.get('oauth_consumer_key')
              if not key:
                  for header in ['Authorization', 'HTTP_AUTHORIZATION']:
                      auth_header_value = request.META.get(header)
                      if auth_header_value:
                          key = auth_header_value.split(' ', 1)[1]
                          break
              if not key and request.method == 'POST':
                  if request.META.get('CONTENT_TYPE') == 'application/json':
                      decoded_body = request.body.decode('utf8')
                      key = json.loads(decoded_body)['oauth_consumer_key']
              if not key:
                  log.info('OAuth20Authentication. No consumer_key found.')
                  return None
              """
              If verify_access_token() does not pass, it will raise an error
              """
              token = self.verify_access_token(key, request, **kwargs)
  
              # If OAuth authentication is successful, set the request user to
              # the token user for authorization
              request.user = token.user
  
              # If OAuth authentication is successful, set oauth_consumer_key on
              # request in case we need it later
              request.META['oauth_consumer_key'] = key
              return True
          except KeyError:
              log.exception("Error in OAuth20Authentication.")
              request.user = AnonymousUser()
              return False
          except Exception:
              log.exception("Error in OAuth20Authentication.")
              return False