docs: def VerifyGitkitToken(self, jwt):
      """Verifies a Gitkit token string.
  
      Args:
        jwt: string, the token to be checked
  
      Returns:
        GitkitUser, if the token is valid. None otherwise.
      """
      certs = self.rpc_helper.GetPublicCert()
      crypt.MAX_TOKEN_LIFETIME_SECS = 30 * 86400  # 30 days
      parsed = None
      for aud in filter(lambda x: x is not None, [self.project_id, self.client_id]):
        try:
          parsed = crypt.verify_signed_jwt_with_certs(jwt, certs, aud)
        except crypt.AppIdentityError as e:
          if "Wrong recipient" not in e.message:
            return None
        if parsed:
          return GitkitUser.FromToken(parsed)
      return None