Add GAE standard + firebase tictactoe sample

appengine/firebase-tictactoe/README.md

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+# Tic Tac Toe on Google App Engine Standard using Firebase
+
+This directory contains a project that implements a realtime two-player game of
+Tic Tac Toe on Google [App Engine Standard][standard], using the [Firebase] database
+for realtime notifications when the board changes.
+
+[Firebase]: https://firebase.google.com
+[standard]: https://cloud.google.com/appengine/docs/about-the-standard-environment
+
+## Prerequisites
+
+* Install [Apache Maven][maven] 3.0.5 or later
+* Install the [Google Cloud SDK][sdk]
+* Create a project in the [Firebase Console][fb-console]
+* In the [Overview section][fb-overview] of the Firebase console, click 'Add
+  Firebase to your web app' and replace the contents of the file
+  `src/main/webapp/WEB-INF/view/firebase_config.jspf` with that code snippet.
+* If using the development appserver to run the app locally, you must supply
+  credentials that would otherwise be inferred from the App Engine environment.
+  Download [service account credentials][creds] and set the
+  `GOOGLE_APPLICATION_CREDENTIALS` environment variable to its path:
+
+        export GOOGLE_APPLICATION_CREDENTIALS=/path/to/your/credentials.json
+
+
+[fb-console]: https://console.firebase.google.com
+[sdk]: https://cloud.google.com/sdk
+[creds]: https://console.firebase.google.com/iam-admin/serviceaccounts/project?project=_&consoleReturnUrl=https:%2F%2Fconsole.firebase.google.com%2Fproject%2F_%2Fsettings%2Fgeneral%2F
+[fb-overview]: https://console.firebase.google.com/project/_/overview
+
+
+## Run the sample
+
+* To run the app locally using the development appserver:
+
+    ```sh
+    $ mvn appengine:run
+    ```
+
+## Troubleshooting
+
+* If you see the error `Google Cloud SDK path was not provided ...`:
+    * Make sure you've installed the [Google Cloud SDK][sdk]
+    * Make sure the Google Cloud SDK's `bin/` directory is in your `PATH`. If
+      you prefer it not to be, you can also set the environment variable
+      `GOOGLE_CLOUD_SDK_HOME` to point to where you installed the SDK:
+
+        ```sh
+        export GOOGLE_CLOUD_SDK_HOME=/path/to/google-cloud-sdk
+        ```
+
+## Contributing changes
+
+See [CONTRIBUTING.md](../../CONTRIBUTING.md).
+
+## Licensing
+
+See [LICENSE](../../LICENSE).
+

appengine/firebase-tictactoe/pom.xml

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+<!--
+ Copyright 2015 Google Inc. All Rights Reserved.
+
+ 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.
+-->
+<project>
+    <modelVersion>4.0.0</modelVersion>
+    <packaging>war</packaging>
+    <version>1.0-SNAPSHOT</version>
+    <groupId>com.example.appengine</groupId>
+    <artifactId>appengine-firebase</artifactId>
+    <parent>
+        <groupId>com.google.cloud</groupId>
+        <artifactId>doc-samples</artifactId>
+        <version>1.0.0</version>
+        <relativePath>../..</relativePath>
+    </parent>
+    <properties>
+        <objectify.version>5.1.13</objectify.version>
+        <servlet-api.version>2.5</servlet-api.version>
+        <gson.version>2.7</gson.version>
+        <guava.version>19.0</guava.version>
+        <google-api-client.version>1.22.0</google-api-client.version>
+        <junit.version>4.12</junit.version>
+        <mockito.version>1.10.19</mockito.version>
+        <google-truth.version>0.30</google-truth.version>
+        <appengine-maven.version>1.0.0</appengine-maven.version>
+    </properties>
+    <!-- [START set_versions] -->
+    <prerequisites>
+        <maven>3.3.9</maven>
+    </prerequisites>
+    <!-- [END set_versions] -->
+    <dependencies>
+        <dependency>
+            <groupId>com.google.appengine</groupId>
+            <artifactId>appengine-api-1.0-sdk</artifactId>
+            <version>${appengine.sdk.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.servlet</groupId>
+            <artifactId>servlet-api</artifactId>
+            <version>${servlet-api.version}</version>
+            <type>jar</type>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+          <groupId>com.google.code.gson</groupId>
+          <artifactId>gson</artifactId>
+          <version>2.7</version>
+        </dependency>
+        <dependency>
+            <groupId>com.googlecode.objectify</groupId>
+            <artifactId>objectify</artifactId>
+            <version>${objectify.version}</version>
+        </dependency>
+        <dependency>
+          <groupId>com.google.guava</groupId>
+          <artifactId>guava</artifactId>
+          <version>${guava.version}</version>
+        </dependency>
+        <dependency>
+          <groupId>com.google.api-client</groupId>
+          <artifactId>google-api-client-appengine</artifactId>
+          <version>${google-api-client.version}</version>
+        </dependency>
+
+
+        <!-- Test Dependencies -->
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-all</artifactId>
+            <version>${mockito.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.appengine</groupId>
+            <artifactId>appengine-testing</artifactId>
+            <version>${appengine.sdk.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.appengine</groupId>
+            <artifactId>appengine-api-stubs</artifactId>
+            <version>${appengine.sdk.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.appengine</groupId>
+            <artifactId>appengine-tools-sdk</artifactId>
+            <version>${appengine.sdk.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.truth</groupId>
+            <artifactId>truth</artifactId>
+            <version>${google-truth.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+    <build>
+        <!-- for hot reload of the web application -->
+        <outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes
+        </outputDirectory>
+        <plugins>
+            <plugin>
+                <groupId>com.google.cloud.tools</groupId>
+                <artifactId>appengine-maven-plugin</artifactId>
+                <version>${appengine-maven.version}</version>
+            </plugin>
+        </plugins>
+    </build>
+</project>

appengine/firebase-tictactoe/src/main/java/com/example/appengine/firetactoe/DeleteServlet.java

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+/*
+ * Copyright 2016 Google Inc. All Rights Reserved.
+ *
+ * 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 com.example.appengine.firetactoe;
+
+import com.google.appengine.api.users.UserService;
+import com.google.appengine.api.users.UserServiceFactory;
+import com.googlecode.objectify.Objectify;
+import com.googlecode.objectify.ObjectifyService;
+
+import java.io.IOException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * Handler that deletes the Firebase database that serves as the realtime communication channel.
+ * This handler should be invoked after a game has finished, to clean up the channel.
+ */
+public class DeleteServlet extends HttpServlet {
+  @Override
+  public void doPost(HttpServletRequest request, HttpServletResponse response)
+      throws IOException {
+    String gameId = request.getParameter("gameKey");
+    Objectify ofy = ObjectifyService.ofy();
+    Game game = ofy.load().type(Game.class).id(gameId).safe();
+
+    UserService userService = UserServiceFactory.getUserService();
+    String currentUserId = userService.getCurrentUser().getUserId();
+
+    game.deleteChannel(currentUserId);
+  }
+}