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Example for pubsub authenticated push (#1407)
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...gine-java8/pubsub/src/main/java/com/example/appengine/pubsub/PubSubAuthenticatedPush.java
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| /* | ||
| * Copyright 2019 Google LLC | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| package com.example.appengine.pubsub; | ||
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| import com.google.api.client.googleapis.auth.oauth2.GoogleIdToken; | ||
| import com.google.api.client.googleapis.auth.oauth2.GoogleIdTokenVerifier; | ||
| import com.google.api.client.http.javanet.NetHttpTransport; | ||
| import com.google.api.client.json.jackson2.JacksonFactory; | ||
| import com.google.gson.Gson; | ||
| import com.google.gson.JsonElement; | ||
| import com.google.gson.JsonParser; | ||
| import java.io.IOException; | ||
| import java.util.Base64; | ||
| import java.util.Collections; | ||
| import java.util.stream.Collectors; | ||
| import javax.servlet.ServletException; | ||
| import javax.servlet.annotation.WebServlet; | ||
| import javax.servlet.http.HttpServlet; | ||
| import javax.servlet.http.HttpServletRequest; | ||
| import javax.servlet.http.HttpServletResponse; | ||
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| // [START gae_standard_pubsub_auth_push] | ||
| @WebServlet(value = "/pubsub/authenticated-push") | ||
| public class PubSubAuthenticatedPush extends HttpServlet { | ||
| private final String pubsubVerificationToken = System.getenv("PUBSUB_VERIFICATION_TOKEN"); | ||
| private final MessageRepository messageRepository; | ||
| private final GoogleIdTokenVerifier verifier = | ||
| new GoogleIdTokenVerifier.Builder(new NetHttpTransport(), new JacksonFactory()) | ||
| /** | ||
| * Please change example.com to match with value you are providing while creating | ||
| * subscription as provided in @see <a | ||
| * href="https://github.com/GoogleCloudPlatform/java-docs-samples/tree/master/appengine-java8/pubsub">README</a>. | ||
| */ | ||
| .setAudience(Collections.singletonList("example.com")) | ||
| .build(); | ||
| private final Gson gson = new Gson(); | ||
| private final JsonParser jsonParser = new JsonParser(); | ||
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| @Override | ||
| public void doPost(HttpServletRequest req, HttpServletResponse resp) | ||
| throws IOException, ServletException { | ||
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| // Verify that the request originates from the application. | ||
| if (req.getParameter("token").compareTo(pubsubVerificationToken) != 0) { | ||
| resp.setStatus(HttpServletResponse.SC_BAD_REQUEST); | ||
| return; | ||
| } | ||
| // Get the Cloud Pub/Sub-generated JWT in the "Authorization" header. | ||
| String authorizationHeader = req.getHeader("Authorization"); | ||
| if (authorizationHeader == null | ||
| || authorizationHeader.isEmpty() | ||
| || authorizationHeader.split(" ").length != 2) { | ||
| resp.setStatus(HttpServletResponse.SC_BAD_REQUEST); | ||
| return; | ||
| } | ||
| String authorization = authorizationHeader.split(" ")[1]; | ||
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| try { | ||
| // Verify and decode the JWT. | ||
| GoogleIdToken idToken = verifier.verify(authorization); | ||
| messageRepository.saveToken(authorization); | ||
| messageRepository.saveClaim(idToken.getPayload().toPrettyString()); | ||
| // parse message object from "message" field in the request body json | ||
| // decode message data from base64 | ||
| Message message = getMessage(req); | ||
| messageRepository.save(message); | ||
| // 200, 201, 204, 102 status codes are interpreted as success by the Pub/Sub system | ||
| resp.setStatus(102); | ||
| super.doPost(req, resp); | ||
| } catch (Exception e) { | ||
| resp.setStatus(HttpServletResponse.SC_BAD_REQUEST); | ||
| } | ||
| } | ||
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| private Message getMessage(HttpServletRequest request) throws IOException { | ||
| String requestBody = request.getReader().lines().collect(Collectors.joining("\n")); | ||
| JsonElement jsonRoot = jsonParser.parse(requestBody); | ||
| String messageStr = jsonRoot.getAsJsonObject().get("message").toString(); | ||
| Message message = gson.fromJson(messageStr, Message.class); | ||
| // decode from base64 | ||
| String decoded = decode(message.getData()); | ||
| message.setData(decoded); | ||
| return message; | ||
| } | ||
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| private String decode(String data) { | ||
| return new String(Base64.getDecoder().decode(data)); | ||
| } | ||
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| PubSubAuthenticatedPush(MessageRepository messageRepository) { | ||
| this.messageRepository = messageRepository; | ||
| } | ||
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| public PubSubAuthenticatedPush() { | ||
| this(MessageRepositoryImpl.getInstance()); | ||
| } | ||
| } | ||
| // [END gae_standard_pubsub_auth_push] |
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