Add appengine mailgun sample

appengine/.gitignore

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+# Google App Engine generated folder
+appengine-generated/
+
+# Java
+*.class
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.ear
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+# maven
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+
+service-account.json
+
+#eclipse
+.classpath
+.settings
+.project

appengine/mailgun/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+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 xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <packaging>war</packaging>
+  <version>1.0-SNAPSHOT</version>
+  <groupId>com.example.appengine</groupId>
+  <artifactId>appengine-mailgun</artifactId>
+  <parent>
+    <groupId>com.google.cloud</groupId>
+    <artifactId>doc-samples</artifactId>
+    <version>1.0.0</version>
+    <relativePath>../..</relativePath>
+  </parent>
+  <dependencies>
+    <dependency>
+      <groupId>javax.servlet</groupId>
+      <artifactId>javax.servlet-api</artifactId>
+      <version>3.1.0</version>
+      <type>jar</type>
+      <scope>provided</scope>
+    </dependency>
+    <!-- [START dependencies] -->
+    <dependency>
+      <groupId>com.sun.jersey</groupId>
+      <artifactId>jersey-core</artifactId>
+      <version>1.19</version>
+    </dependency>
+    <dependency>
+      <groupId>com.sun.jersey</groupId>
+      <artifactId>jersey-client</artifactId>
+      <version>1.19</version>
+    </dependency>
+    <dependency>
+      <groupId>com.sun.jersey.contribs</groupId>
+      <artifactId>jersey-multipart</artifactId>
+      <version>1.19</version>
+    </dependency>
+    <!-- [END dependencies] -->
+  </dependencies>
+  <build>
+    <!-- for hot reload of the web application -->
+    <outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <version>3.3</version>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>1.7</source>
+          <target>1.7</target>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>com.google.appengine</groupId>
+        <artifactId>appengine-maven-plugin</artifactId>
+        <version>1.9.31</version>
+      </plugin>
+    </plugins>
+  </build>
+</project>

appengine/mailgun/src/main/java/com/example/appengine/mailgun/MailgunServlet.java

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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.
+ */
+
+package com.example.appengine.mailgun;
+
+import com.sun.jersey.api.client.Client;
+import com.sun.jersey.api.client.ClientResponse;
+import com.sun.jersey.api.client.WebResource;
+import com.sun.jersey.api.client.filter.HTTPBasicAuthFilter;
+import com.sun.jersey.core.util.MultivaluedMapImpl;
+import com.sun.jersey.multipart.FormDataMultiPart;
+import com.sun.jersey.multipart.file.FileDataBodyPart;
+
+import java.io.File;
+import java.io.IOException;
+
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.ws.rs.core.MediaType;
+
+// [START example]
+@SuppressWarnings("serial")
+@WebServlet(name = "mailgun", value = "/send/email")
+public class MailgunServlet extends HttpServlet {
+
+  private static final String MAILGUN_DOMAIN_NAME = System.getenv("MAILGUN_DOMAIN_NAME");
+  private static final String MAILGUN_API_KEY = System.getenv("MAILGUN_API_KEY");
+
+  @Override
+  public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
+    String type = req.getParameter("submit");
+    String recipient = req.getParameter("to");
+    ClientResponse clientResponse;
+    if (type.equals("Send simple email")) {
+      clientResponse = sendSimpleMessage(recipient);
+    } else {
+      clientResponse = sendComplexMessage(recipient);
+    }
+    if (clientResponse.getStatus() == 200) {
+      resp.getWriter().print("Email sent.");
+    }
+  }
+
+  // [START simple]
+  private ClientResponse sendSimpleMessage(String recipient) {
+    Client client = Client.create();
+    client.addFilter(new HTTPBasicAuthFilter("api", MAILGUN_API_KEY));
+    WebResource webResource = client.resource("https://api.mailgun.net/v3/" + MAILGUN_DOMAIN_NAME
+        + "/messages");
+    MultivaluedMapImpl formData = new MultivaluedMapImpl();
+    formData.add("from", "Mailgun User <mailgun@" + MAILGUN_DOMAIN_NAME + ">");
+    formData.add("to", recipient);
+    formData.add("subject", "Simple Mailgun Example");
+    formData.add("text", "Plaintext content");
+    return webResource.type(MediaType.APPLICATION_FORM_URLENCODED).post(ClientResponse.class,
+        formData);
+  }
+  // [END simple]
+
+  // [START complex]
+  private ClientResponse sendComplexMessage(String recipient) {
+    Client client = Client.create();
+    client.addFilter(new HTTPBasicAuthFilter("api", MAILGUN_API_KEY));
+    WebResource webResource = client.resource("https://api.mailgun.net/v3/" + MAILGUN_DOMAIN_NAME
+        + "/messages");
+    FormDataMultiPart formData = new FormDataMultiPart();
+    formData.field("from", "Mailgun User <mailgun@" + MAILGUN_DOMAIN_NAME + ">");
+    formData.field("to", recipient);
+    formData.field("subject", "Complex Mailgun Example");
+    formData.field("html", "<html>HTML <strong>content</strong></html>");
+    ClassLoader classLoader = getClass().getClassLoader();
+    File txtFile = new File(classLoader.getResource("example-attachment.txt").getFile());
+    formData.bodyPart(new FileDataBodyPart("attachment", txtFile, MediaType.TEXT_PLAIN_TYPE));
+    return webResource.type(MediaType.MULTIPART_FORM_DATA_TYPE)
+        .post(ClientResponse.class, formData);
+  }
+  // [END complex]
+}
+// [END example]

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

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+<?xml version="1.0" encoding="utf-8"?>
+<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
+  <application>YOUR-PROJECT-ID</application>
+  <version>YOUR-VERSION-ID</version>
+  <threadsafe>true</threadsafe>
+  <env-variables>
+    <env-var name="MAILGUN_DOMAIN_NAME" value="YOUR-MAILGUN-DOMAIN-NAME" />
+    <env-var name="MAILGUN_API_KEY" value="YOUR-MAILGUN-API-KEY" />
+  </env-variables>
+</appengine-web-app>

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

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+<?xml version="1.0" encoding="utf-8"?>
+<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee"
+  xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
+  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
+  version="2.5">
+  <servlet>
+    <servlet-name>mailgun</servlet-name>
+    <servlet-class>com.example.appengine.mailgun.MailgunServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>mailgun</servlet-name>
+    <url-pattern>/send/email</url-pattern>
+  </servlet-mapping>
+</web-app>

appengine/mailgun/src/main/webapp/index.html

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+<!doctype html>
+<html>
+<head>
+  <title>Mailgun on Google App Engine Managed VMs</title>
+</head>
+<body>
+<!-- [START form] -->
+<form method="post" action="/send/email">
+  <input type="text" name="to" placeholder="Enter recipient email">
+  <input type="submit" name="submit" value="Send simple email">
+  <input type="submit" name="submit" value="Send complex email">
+</form>
+<!-- [END form] -->
+</body>
+</html>

pom.xml

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     <modules>
         <module>appengine/appidentity</module>
         <module>appengine/helloworld</module>
+        <module>appengine/mailgun</module>
         <module>bigquery</module>
         <module>datastore</module>
         <module>logging</module>