<%# Copyright 2013-2018 the original author or authors from the JHipster project. This file is part of the JHipster project, see https://jhipster.github.io/ for more information. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. -%> package <%=packageName%>.security.oauth2; import <%=packageName%>.config.oauth2.OAuth2Properties; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.cloud.client.discovery.DiscoveryClient; import org.springframework.http.HttpEntity; import org.springframework.http.HttpHeaders; import org.springframework.http.HttpMethod; import org.springframework.security.jwt.crypto.sign.RsaVerifier; import org.springframework.security.jwt.crypto.sign.SignatureVerifier; import org.springframework.security.oauth2.common.exceptions.InvalidClientException; import org.springframework.stereotype.Component; import org.springframework.web.client.RestTemplate; import java.util.Map; /** * Client fetching the public key from UAA to create a SignatureVerifier. */ @Component public class UaaSignatureVerifierClient implements OAuth2SignatureVerifierClient { private final Logger log = LoggerFactory.getLogger(UaaSignatureVerifierClient.class); private final RestTemplate restTemplate; protected final OAuth2Properties oAuth2Properties; public UaaSignatureVerifierClient(DiscoveryClient discoveryClient, @Qualifier("loadBalancedRestTemplate") RestTemplate restTemplate, OAuth2Properties oAuth2Properties) { this.restTemplate = restTemplate; this.oAuth2Properties = oAuth2Properties; // Load available UAA servers discoveryClient.getServices(); } /** * Fetches the public key from the UAA. * * @return the public key used to verify JWT tokens; or null. */ @Override public SignatureVerifier getSignatureVerifier() throws Exception { try { HttpEntity request = new HttpEntity(new HttpHeaders()); String key = (String) restTemplate .exchange(getPublicKeyEndpoint(), HttpMethod.GET, request, Map.class).getBody() .get("value"); return new RsaVerifier(key); } catch (IllegalStateException ex) { log.warn("could not contact UAA to get public key"); return null; } } /** Returns the configured endpoint URI to retrieve the public key. */ private String getPublicKeyEndpoint() { String tokenEndpointUrl = oAuth2Properties.getSignatureVerification().getPublicKeyEndpointUri(); if (tokenEndpointUrl == null) { throw new InvalidClientException("no token endpoint configured in application properties"); } return tokenEndpointUrl; } }