如何使用 GMAIL API 从 Google Apps 脚本发送电子邮件？

Question

I am trying to automise sending of the Emails from my account using Gmail API in Google Apps Script.我正在尝试使用 Google Apps 脚本中的 Gmail API 自动从我的帐户发送电子邮件。

Here is my code:这是我的代码：

function email_checker() {
  var yourEmailAddress = "###@gmail.com";
  var myEmailAddress = "support@###.com";
  var subject = "testing mail";
  var forScope = GmailApp.getInboxUnreadCount();
  var htmlBody = '<html><body>' + '<h1>HI</h1>' + '</body></html>';

  var message = 'From: Me <' + myEmailAddress + '>\r\n' +
    'To: Me <' + myEmailAddress + '>\r\n' +
    'Subject: ' + subject + '\r\n' +
    'Content-Type: text/html; charset=utf-8\r\n' +
    'Content-Transfer-Encoding: quoted-printable\r\n\r\n' +
    htmlBody;

  var draftBody = Utilities.base64Encode(message);
  draftBody = draftBody.replace(/\//g, '_').replace(/\+/g, '-');

  var params = {
    method: "post",
    contentType: "application/json",
    headers: {
      "Authorization": "Bearer " + ScriptApp.getOAuthToken()
    },
    muteHttpExceptions: true,
    payload: JSON.stringify({
      "message": {
        "raw": draftBody
      }
    })
  };

  var resp = UrlFetchApp.fetch("https://gmail.googleapis.com/upload/gmail/v1/users/me/messages/send", params);
  Logger.log(resp.getContentText());
}

I am getting the following error: Media type 'application/json' is not supported.我收到以下错误：不支持媒体类型“应用程序/json”。

Can anyone please advise on what I am doing wrong?任何人都可以请教我做错了什么吗？

Thank you.谢谢你。

Answer 1

I believe your goal and your current situation as follows.我相信你的目标和你目前的情况如下。

You want to send an email using Gmail API with UrlFetchApp.您想使用 Gmail API 和 UrlFetchApp 发送电子邮件。
You have already done the settings for sending the email.您已经完成了发送电子邮件的设置。
- Gmail API is enabled. Gmail API 已启用。
- The scopes for sending emails can be included.可以包括发送电子邮件的范围。

Modification points:改装要点：

From your endtpoint, it is found that the media upload request is used.从您的端点，发现使用了媒体上传请求。
In this case,在这种情况下，
- the request body is required to create with multipart/alternative .需要使用multipart/alternative创建请求正文。
- It is not required to use the base64 encode with the web safe.网络安全不需要使用 base64 编码。
- The content type is required to use message/rfc822 .使用message/rfc822需要内容类型。
- The created request body can be directly used for payload .创建的请求体可以直接用于payload 。

When above points are reflected to your script, it becomes as follows.当以上几点反映到你的脚本中时，它变成如下。

Modified script:修改后的脚本：

function email_checker() {
  var yourEmailAddress = "###@gmail.com";
  var myEmailAddress = "support@###.com";
  var subject = "testing mail";
  var forScope = GmailApp.getInboxUnreadCount();
  var htmlBody = '<html><body>' + '<h1>HI</h1>' + '</body></html>';

  var message = 'MIME-Version: 1.0\r\n' +
    'From: Me <' + myEmailAddress + '>\r\n' +
    'To: Me <' + myEmailAddress + '>\r\n' +
    'Subject: ' + subject + '\r\n' +
    'Content-type: multipart/alternative; boundary=boundaryboundary\r\n\r\n' +
    '--boundaryboundary\r\n' +
    'Content-type: text/html; charset=UTF-8\r\n' +
    'Content-Transfer-Encoding: quoted-printable\r\n\r\n' +
    htmlBody + "\r\n\r\n" +
    '--boundaryboundary--';

  var params = {
    method: "post",
    contentType: "message/rfc822",
    headers: {
      "Authorization": "Bearer " + ScriptApp.getOAuthToken()
    },
    muteHttpExceptions: true,
    payload: message
  };

  var resp = UrlFetchApp.fetch("https://gmail.googleapis.com/upload/gmail/v1/users/me/messages/send", params);
  Logger.log(resp.getContentText());
}

Note:笔记：

If you want to use the endpoint of POST https://gmail.googleapis.com/gmail/v1/users/{userId}/messages/send , please modify your script as follows.如果您想使用POST https://gmail.googleapis.com/gmail/v1/users/{userId}/messages/send的端点，请按如下方式修改您的脚本。
- From从
```
 var params = { method: "post", contentType: "application/json", headers: { "Authorization": "Bearer " + ScriptApp.getOAuthToken() }, muteHttpExceptions: true, payload: JSON.stringify({ "message": { "raw": draftBody } }) }; var resp = UrlFetchApp.fetch("https://gmail.googleapis.com/upload/gmail/v1/users/me/messages/send", params); Logger.log(resp.getContentText());
```
- To到
```
 var params = { method: "post", contentType: "application/json", headers: { "Authorization": "Bearer " + ScriptApp.getOAuthToken() }, muteHttpExceptions: true, payload: JSON.stringify({"raw": draftBody}) }; var resp = UrlFetchApp.fetch("https://gmail.googleapis.com/gmail/v1/users/me/messages/send", params); Logger.log(resp.getContentText());
```
- In this case, var draftBody = Utilities.base64Encode(message); draftBody = draftBody.replace(/\\//g, '_').replace(/\\+/g, '-');在这种情况下， var draftBody = Utilities.base64Encode(message); draftBody = draftBody.replace(/\\//g, '_').replace(/\\+/g, '-'); var draftBody = Utilities.base64Encode(message); draftBody = draftBody.replace(/\\//g, '_').replace(/\\+/g, '-'); can be also modified to var draftBody = Utilities.base64EncodeWebSafe(message);也可以修改为var draftBody = Utilities.base64EncodeWebSafe(message); . .

Reference:参考：

Method: users.messages.send 方法：users.messages.send

如何使用 GMAIL API 从 Google Apps 脚本发送电子邮件？

问题描述

1 个解决方案

解决方案1
2 已采纳 2020-09-19 23:19:58

Modification points:改装要点：

Modified script:修改后的脚本：

Note:笔记：

Reference:参考：

如何使用 GMAIL API 从 Google Apps 脚本发送电子邮件？

问题描述

1 个解决方案

解决方案1 2 已采纳 2020-09-19 23:19:58

Modification points:改装要点：

Modified script:修改后的脚本：

Note:笔记：

Reference:参考：

解决方案1
2 已采纳 2020-09-19 23:19:58