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Add App Identity example to assert identity to Google APIs.
This sample is copied almost exactly from https://cloud.google.com/appengine/docs/java/appidentity/#asserting_identity_to_google_apis I also add a servlet for the sample code so that it can be more easily demonstrated and manually tested.
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‎appengine/appidentity/pom.xml

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@@ -33,13 +33,23 @@ Copyright 2015 Google Inc. All Rights Reserved.
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<artifactId>appengine-api-1.0-sdk</artifactId>
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<version>${appengine.target.version}</version>
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</dependency>
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<dependency>
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<groupId>com.google.guava</groupId>
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<artifactId>guava</artifactId>
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<version>19.0</version>
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</dependency>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>servlet-api</artifactId>
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<version>2.5</version>
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<type>jar</type>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.json</groupId>
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<artifactId>json</artifactId>
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<version>20151123</version>
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</dependency>
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<!-- Test Dependencies -->
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<dependency>

‎appengine/appidentity/src/main/java/com/example/appengine/appidentity/UrlShortener.java

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/**
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* Copyright 2016 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.appengine.appidentity;
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import com.google.appengine.api.appidentity.AppIdentityService;
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import com.google.appengine.api.appidentity.AppIdentityServiceFactory;
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import com.google.common.io.CharStreams;
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import org.json.JSONObject;
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import org.json.JSONTokener;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.OutputStreamWriter;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.nio.charset.StandardCharsets;
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import java.util.ArrayList;
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@SuppressWarnings("serial")
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class UrlShortener {
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// [START asserting_identity_to_Google_APIs]
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public String createShortUrl(String longUrl) throws Exception {
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try {
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ArrayList<String> scopes = new ArrayList<String>();
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scopes.add("https://www.googleapis.com/auth/urlshortener");
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AppIdentityService appIdentity = AppIdentityServiceFactory.getAppIdentityService();
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AppIdentityService.GetAccessTokenResult accessToken = appIdentity.getAccessToken(scopes);
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// The token asserts the identity reported by appIdentity.getServiceAccountName()
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JSONObject request = new JSONObject();
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request.put("longUrl", longUrl);
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URL url = new URL("https://www.googleapis.com/urlshortener/v1/url?pp=1");
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HttpURLConnection connection = (HttpURLConnection) url.openConnection();
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connection.setDoOutput(true);
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connection.setRequestMethod("POST");
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connection.addRequestProperty("Content-Type", "application/json");
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connection.addRequestProperty("Authorization", "Bearer " + accessToken.getAccessToken());
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OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
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request.write(writer);
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writer.close();
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if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
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// Note: Should check the content-encoding.
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// Any JSON parser can be used; this one is used for illustrative purposes.
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JSONTokener response_tokens = new JSONTokener(connection.getInputStream());
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JSONObject response = new JSONObject(response_tokens);
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return (String) response.get("id");
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} else {
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try (InputStream s = connection.getErrorStream();
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InputStreamReader r = new InputStreamReader(s, StandardCharsets.UTF_8)) {
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throw new RuntimeException(String.format(
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"got error (%d) response %s from %s",
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connection.getResponseCode(),
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CharStreams.toString(r),
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connection.toString()));
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}
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}
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} catch (Exception e) {
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// Error handling elided.
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throw e;
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}
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}
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// [END asserting_identity_to_Google_APIs]
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}

‎appengine/appidentity/src/main/java/com/example/appengine/appidentity/UrlShortenerServlet.java

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/**
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* Copyright 2016 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.appengine.appidentity;
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import com.google.appengine.api.users.UserService;
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import com.google.appengine.api.users.UserServiceFactory;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.net.URLDecoder;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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@SuppressWarnings("serial")
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public class UrlShortenerServlet extends HttpServlet {
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private final UrlShortener shortener;
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public UrlShortenerServlet() {
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shortener = new UrlShortener();
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}
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@Override
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public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
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PrintWriter w = resp.getWriter();
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w.println("<!DOCTYPE html>");
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w.println("<form method='post'>");
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w.println("<label for='longUrl'>URL:</label>");
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w.println("<input id='longUrl' name='longUrl' type='text'>");
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w.println("<input type='submit' value='Shorten'>");
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w.println("</form>");
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}
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@Override
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public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
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resp.setContentType("text/plain");
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String longUrl = req.getParameter("longUrl");
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if (longUrl == null) {
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resp.sendError(HttpServletResponse.SC_BAD_REQUEST, "missing longUrl parameter");
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return;
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}
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String shortUrl;
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PrintWriter w = resp.getWriter();
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try {
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shortUrl = shortener.createShortUrl(longUrl);
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} catch (Exception e) {
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resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
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w.println("error shortening URL: " + longUrl);
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e.printStackTrace(w);
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return;
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}
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w.print("long URL: ");
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w.println(longUrl);
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w.print("short URL: ");
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w.println(shortUrl);
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}
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}

‎appengine/appidentity/src/main/webapp/WEB-INF/web.xml

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<servlet-name>appidentity</servlet-name>
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<servlet-class>com.example.appengine.appidentity.IdentityServlet</servlet-class>
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</servlet>
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<servlet>
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<servlet-name>urlshortener</servlet-name>
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<servlet-class>com.example.appengine.appidentity.UrlShortenerServlet</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>appidentity</servlet-name>
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<url-pattern>/</url-pattern>
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</servlet-mapping>
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<servlet-mapping>
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<servlet-name>urlshortener</servlet-name>
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<url-pattern>/shorten</url-pattern>
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</servlet-mapping>
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</web-app>

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