Here is my Gmail service configuration/factory class:
import java.io.File; import java.io.IOException; import java.security.GeneralSecurityException; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.core.env.Environment; import com.google.api.client.auth.oauth2.Credential; import com.google.api.client.googleapis.auth.oauth2.GoogleCredential; import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport; import com.google.api.client.http.HttpRequestInitializer; import com.google.api.client.http.javanet.NetHttpTransport; import com.google.api.client.json.jackson2.JacksonFactory; import com.google.api.services.gmail.Gmail; import com.google.api.services.gmail.GmailScopes; public class GmailServiceFactoryBean { private @Autowired Environment env; private final NetHttpTransport transport; private final JacksonFactory jacksonFactory; public GmailServiceFactoryBean() throws GeneralSecurityException, IOException { this.transport = GoogleNetHttpTransport.newTrustedTransport(); this.jacksonFactory = JacksonFactory.getDefaultInstance(); } public Gmail getGmailService() throws IOException, GeneralSecurityException { return new Gmail.Builder(transport, jacksonFactory, getCredential()) .setApplicationName(env.getProperty("gmail.api.application.name")).build(); } private HttpRequestInitializer getCredential() throws IOException, GeneralSecurityException { File p12File = new File(this.getClass().getClassLoader().getResource("google-key.p12").getFile()); Credential credential = new GoogleCredential.Builder() .setServiceAccountId(env.getProperty("gmail.api.service.account.email")) .setServiceAccountPrivateKeyId(env.getProperty("gmail.api.private.key.id")) .setServiceAccountPrivateKeyFromP12File(p12File) .setTransport(transport) .setJsonFactory(jacksonFactory) .setServiceAccountScopes(GmailScopes.all()) //.setServiceAccountUser(env.getProperty("gmail.api.user.email")) .build(); credential.refreshToken(); return credential; } } Here is my inner mailing service that uses previous bean under the hood:
import java.io.ByteArrayOutputStream; import java.io.IOException; import java.security.GeneralSecurityException; import java.util.List; import java.util.Properties; import javax.mail.MessagingException; import javax.mail.Session; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import javax.mail.internet.MimeMessage.RecipientType; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.core.env.Environment; import org.springframework.stereotype.Service; import com.google.api.client.repackaged.org.apache.commons.codec.binary.Base64; import com.google.api.services.gmail.Gmail; import com.google.api.services.gmail.model.Message; import com.example.factory.GmailServiceFactoryBean; import com.example.service.MailService; import com.example.service.exception.MailServiceException; @Service public class MailServiceImpl implements MailService { private @Autowired GmailServiceFactoryBean gmailServiceFactoryBean; private @Autowired Environment env; @Override public void send(com.example.model.Message message, String recipient) throws MailServiceException { try { Gmail gmailService = gmailServiceFactoryBean.getGmailService(); MimeMessage mimeMessage = createMimeMessage(message, recipient); Message gMessage = createMessageWithEmail(mimeMessage); gmailService.users().messages().send("me", gMessage).execute(); } catch(MessagingException | IOException | GeneralSecurityException e) { throw new MailServiceException(e.getMessage(), e.getCause()); } } @Override public void send(com.example.model.Message message, List<String> recipients) throws MailServiceException { for (String recipient : recipients) { send(message, recipient); } } private MimeMessage createMimeMessage(com.example.model.Message message, String recipient) throws MessagingException { Session session = Session.getDefaultInstance(new Properties()); MimeMessage email = new MimeMessage(session); InternetAddress toAddress = new InternetAddress(recipient); InternetAddress fromAddress = new InternetAddress(env.getProperty("gmail.api.service.account.email")); email.setFrom(fromAddress); email.addRecipient(RecipientType.TO, toAddress); email.setSubject(message.getTitle()); email.setText(message.getContent(), env.getProperty("application.encoding")); return email; } private Message createMessageWithEmail(MimeMessage email) throws MessagingException, IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream(); email.writeTo(baos); return new Message().setRaw(Base64.encodeBase64URLSafeString(baos.toByteArray())); } } When I execute method send(Message message, String recipient) of class MailServiceImpl I get following response:
400 Bad Request { "code" : 400, "errors" : [ { "domain" : "global", "message" : "Bad Request", "reason" : "failedPrecondition" } ], "message" : "Bad Request" } Does anyone know what's wrong?
2 Answers
Answers 1
For GMail API to work, you have to "Delegate domain-wide authority to the service account" within your Google Apps account.
Service account doesn't represent a human Google account. You also can't delegate authority to whole Google domain(***@gmail.com).
The other way out could be with OAuth 2.0 for Web Server Applications or Java Mail api
For more do check: GMail REST API: Using Google Credentials Without Impersonate
Answers 2
Check if you have enabled gmail to send mails using 3rd party applications.
Go to my account ->Sign in and Security -> Connected Apps now scroll to the bottom of the page you will get Less secure apps ->change it to on !! Hope this will work
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