googleworkspace · sqrrrl · Feb 8, 2022 · Jan 14, 2022 · Jan 14, 2022 · Jan 14, 2022
diff --git a/gmail/snippets/src/main/java/SendMessage.java b/gmail/snippets/src/main/java/SendMessage.java
@@ -0,0 +1,101 @@
+// Copyright 2022 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
+//
+//     https://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.
+
+
+// [START gmail_send_message]
+import com.google.api.client.googleapis.json.GoogleJsonResponseException;
+import com.google.api.client.http.HttpRequestInitializer;
+import com.google.api.client.http.javanet.NetHttpTransport;
+import com.google.api.client.json.gson.GsonFactory;
+import com.google.api.services.gmail.GmailScopes;
+import com.google.auth.http.HttpCredentialsAdapter;
+import com.google.auth.oauth2.GoogleCredentials;
+import org.apache.commons.codec.binary.Base64;
+import com.google.api.services.gmail.Gmail;
+import com.google.api.services.gmail.model.Message;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Properties;
+
+import javax.mail.MessagingException;
+import javax.mail.Session;
+import javax.mail.internet.InternetAddress;
+import javax.mail.internet.MimeMessage;
+
+/* Class to demonstrate the use of Gmail Send Message API */
+public class SendMessage {
+    /**
+     * Send an email from the user's mailbox to its recipient.
+     *
+     * @param fromEmailAddress - Email address to appear in the from: header
+     * @param toEmailAddress - Email address of the recipient
+     * @return the sent message
+     * @throws MessagingException - if a wrongly formatted address is encountered.
+     * @throws IOException - if service account credentials file not found.
+     */
+    public static Message sendEmail(String fromEmailAddress,
+                                    String toEmailAddress)
+            throws MessagingException, IOException {
+        // Load pre-authorized user credentials from the environment.
+        // TODO(developer) - See https://developers.google.com/identity for
+        // guides on implementing OAuth2 for your application.
+        GoogleCredentials credentials = GoogleCredentials.getApplicationDefault().createScoped(Collections.singletonList(GmailScopes.GMAIL_SEND));
+        HttpRequestInitializer requestInitializer = new HttpCredentialsAdapter(
+                credentials);
+
+        // Create the gmail API client
+        Gmail service = new Gmail.Builder(new NetHttpTransport(),
+                GsonFactory.getDefaultInstance(),
+                requestInitializer)
+                .setApplicationName("Gmail samples")
+                .build();
+
+        // Create the email content
+        String messageSubject = "Test message";
+        String bodyText = "lorem ipsum.";
+
+        // Encode as MIME message
+        Properties props = new Properties();
+        Session session = Session.getDefaultInstance(props, null);
+        MimeMessage email = new MimeMessage(session);
+        email.setFrom(new InternetAddress(fromEmailAddress));
+        email.addRecipient(javax.mail.Message.RecipientType.TO,
+                new InternetAddress(toEmailAddress));
+        email.setSubject(messageSubject);
+        email.setText(bodyText);
+
+        // Encode and wrap the MIME message into a gmail message
+        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
+        email.writeTo(buffer);
+        byte[] rawMessageBytes = buffer.toByteArray();
+        String encodedEmail = Base64.encodeBase64URLSafeString(rawMessageBytes);
+        Message message = new Message();
+        message.setRaw(encodedEmail);
+
+        try {
+            // Create send message
+            message = service.users().messages().send("me", message).execute();
+            System.out.println("Message id: " + message.getId());
+            System.out.println(message.toPrettyString());
+            return message;
+        } catch (GoogleJsonResponseException e) {
+            // TODO(developer) - handle error appropriately
+            System.err.println("Unable to send message: " + e.getDetails());
+            throw e;
+        }
+    }
+}
+// [END gmail_send_message]