def build_request(self, headers, target_app=None, token_type=TokenType.USER, exclude_authorizations=None):
"""
Build a TokenRequest for the given information.
@param target_app: the optional targetSecurityId
@return: A TokenRequest for the request
"""
token = TokenRequest(securityId=self.appConfig.getSecurityID(),
targetSecurityId=target_app,
timestamp=util.current_time_millis(),
type=token_type,
excludeAuthorizations=exclude_authorizations)
token.targetSecurityId = target_app
if token_type == TokenType.USER:
token.proxyPrincipal = self.principal_from_request(headers)
# generate signature
if not self.mock:
signature = self._sign(util.serialize_token_request(token))
else:
signature = ""
return token, signature
