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;@Servicepublic 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?
