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Send HTML email address with simple text backup via Gmail API

The answer to a question in StackOverflow suggests that adding html markup to the body of the email will do the trick. Is this the right decision?

But what if the recipient's mail server / client does not support HTML email?

eg. When using Apache commons email , I do the following:

// set the html message
email.setHtmlMsg("<html>Our logo - <img src=\"cid:"+cid+"\"></html>");
// set the alternative message
email.setTextMsg("Your email client does not support HTML messages");

Is there a way to tell the Gmail API that the message is returned if the recipient's mail server / client does not support HTML?

PS I am particularly interested in Java code examples.

thanks

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2 answers

, Content-Type mixed/alternative text/plain text/html:

API-, Base64- , / _ + -.

:

btoa(
  "Subject: Example Subject\r\n" +
  "From: <example@gmail.com>\r\n" +
  "To: <example@gmail.com>\r\n" +
  "Content-Type: multipart/alternative; boundary=\"foo_bar\"\r\n\r\n" +

  "--foo_bar\r\n" +
  "Content-Type: text/plain; charset=UTF-8\r\n\r\n" +

  "*Bold example message text*\r\n\r\n" +

  "--foo_bar\r\n" +
  "Content-Type: text/html; charset=UTF-8\r\n\r\n" +

  "<div dir=\"ltr\"><b>Bold example message text</b></div>\r\n\r\n" +

  "--foo_bar--" 
).replace(/\+/g, '-').replace(/\//g, '_');

POST https://www.googleapis.com/gmail/v1/users/me/messages/send?access_token={YOUR_API_KEY}

{
 "raw": "U3ViamVjdDogRXhhbXBsZSBTdWJqZWN0DQpGcm9tOiA8ZXhhbXBsZUBnbWFpbC5jb20-DQpUbzogPGV4YW1wbGVAZ21haWwuY29tPg0KQ29udGVudC1UeXBlOiBtdWx0aXBhcnQvYWx0ZXJuYXRpdmU7IGJvdW5kYXJ5PSJmb29fYmFyIg0KDQotLWZvb19iYXINCkNvbnRlbnQtVHlwZTogdGV4dC9wbGFpbjsgY2hhcnNldD1VVEYtOA0KDQoqQm9sZCBleGFtcGxlIG1lc3NhZ2UgdGV4dCoNCg0KLS1mb29fYmFyDQpDb250ZW50LVR5cGU6IHRleHQvaHRtbDsgY2hhcnNldD1VVEYtOA0KDQo8ZGl2IGRpcj0ibHRyIj48Yj5Cb2xkIGV4YW1wbGUgbWVzc2FnZSB0ZXh0PC9iPjwvZGl2Pg0KDQotLWZvb19iYXItLQ=="
}

Java, :

Message message = new MimeMessage(session);
Multipart multiPart = new MimeMultipart("alternative");

MimeBodyPart textPart = new MimeBodyPart();
textPart.setText(text, "utf-8");

MimeBodyPart htmlPart = new MimeBodyPart();
htmlPart.setContent(html, "text/html; charset=utf-8");

multiPart.addBodyPart(textPart); 
multiPart.addBodyPart(htmlPart);
message.setContent(multiPart);

ByteArrayOutputStream output = new ByteArrayOutputStream();
message.writeTo(output);
String rawEmail = Base64.encodeBase64URLSafeString(output.toByteArray());

Message message = new Message();
message.setRaw(rawEmail);
message = service.users().messages().send(userId, message).execute();
+4

Throlle. , , gmail api

:

, java, , html . , , , github :

:

  def sendHTMLEmail() {
        String emailBox='me@gmail.com'
        String to ='someuser@domain.com'
        String html="<html><body><table><tr><td><b>aa</b></td><td>bb</td></tr></table><h1>html content</h1></body></html>"
        MimeMessage content = gmailService.createHTMLEmail(to,emailBox,'gmail test','testing gmail via app',html)
        def message = gmailService.sendMessage(gmail,'me',content)
        render "=== ${message.id}"
}

:

public static MimeMessage createHTMLEmail(String to, String from, String subject, String text, String html) {
        Properties props = new Properties()
        Session session = Session.getDefaultInstance(props, null)

        MimeMessage email = new MimeMessage(session)
        Multipart multiPart = new MimeMultipart("alternative")
        email.setFrom(new InternetAddress(from))
        email.addRecipient(javax.mail.Message.RecipientType.TO, new InternetAddress(to))
        email.setSubject(subject)

        MimeBodyPart textPart = new MimeBodyPart()
        textPart.setText(text, "utf-8")

        MimeBodyPart htmlPart = new MimeBodyPart()
        htmlPart.setContent(html, "text/html; charset=utf-8")

        multiPart.addBodyPart(textPart)
        multiPart.addBodyPart(htmlPart)
        email.setContent(multiPart)
        return email
    }

sendMessage ( github):

public static Message sendMessage(Gmail service,String userId,MimeMessage emailContent) throws MessagingException, IOException {
        try {
            Message message = createMessageWithEmail(emailContent)
            message = service.users().messages().send(userId, message).execute()
            return message
        } catch (Exception e) {
            //log.error "${e}"
        }
    }

createMessageWithEmail

public static Message createMessageWithEmail(MimeMessage emailContent) throws MessagingException, IOException {
        ByteArrayOutputStream buffer = new ByteArrayOutputStream()
        emailContent.writeTo(buffer)
        byte[] bytes = buffer.toByteArray()
        String encodedEmail = Base64.encodeBase64URLSafeString(bytes)
        Message message = new Message()
        message.setRaw(encodedEmail)
        return message
    }
+2

Source: https://habr.com/ru/post/1619101/

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