使用Google Apps脚本移除Gmail电子邮件的附件 [英] Remove an attachment of a Gmail email with Google Apps Script

问题描述

使用Google Apps脚本（ http://script.google.com ），我从文档，如何发送，转发，移动到垃圾邮件等，但我不知道找不到如何删除电子邮件附件，即： 在HTML或纯文本中都可以）

保留原始发件人，保留收件人

保留原始邮件日期/小时（重要！ ）

删除附件

如果无法通过API，is有一种方法可以将信息重新发送给我自己，同时保持1,2和3？

---

注意： GmailAttachment 类看起来很有趣，并允许列出收件人：

  var threads = GmailApp.getInboxThreads（0，10）; 
 var msgs = GmailApp.getMessagesForThreads（线程）; （var i = 0; j  var（$ i = 0; i ） attachments = msgs [i] [j] .getAttachments（）; 
 for（var k = 0; k  Logger.log（'Message'％s包含附件％s（％s bytes）'，
 msgs [i] [j] .getSubject（），attachments [k] .getName（），attachments [k] .getSize（））; 
} 
} 
} 
  

但我找不到如何删除附件。

注意：我已经研究了许多其他解决方案，因此我已经阅读了几乎所有关于此的解决方案（解决方案与专门的网络服务，与当地的客户，如雷鸟+附件提取插件等），但他们都不是真的很酷。这就是为什么我在寻找通过Google Apps脚本手动完成的解决方案。

解决方案

必须重新创建ish ：

消息不可变：只能创建和删除消息。

使用高级Gmail服务与 Gmail API插入（）你可以使用下面的方法绕过它： Gmail.Users.Messages.insert（resource，userId ）

这项高级服务 必须已启用 才能使用。 ：[用 email_id 或以您希望获取电子邮件的任何方式填写 EMAIL_ID ]

 函数removeAttachments（）{
 //获取`raw`电子邮件
 var email = GmailApp。 getMessageBy ID（ EMAIL_ID）getRawContent（）。 
 
 //查找html或纯文本电子邮件的结束边界
 var re_html = /（ -  * \ w *）（\r）*（\\\
）*（ ？= Content-Type：text \ / html;）/。exec（email）; 
 var re = re_html || /（ -  * \ w *）（\r）*（\ n）*（？= Content-Type：text \ / plain;）/。exec（email）; 
 
 //找到消息边界的索引
 var start = re [1] .length + re.index; 
 var boundary = email.indexOf（re [1]，start）; 
 
 //删除附件&编码附件免费的RFC 2822格式的电子邮件字符串
 var base64_encoded_email = Utilities.base64EncodeWebSafe（email.substr（0，boundary））; 
 //将base64Encoded字符串设置为`raw`所需的属性
 var resource = {'raw'：base64_encoded_email} 
 
 //将电子邮件重新插入用户gmail插入时间的帐户
 / * var response = Gmail.Users.Messages.insert（resource，'me'）; * / 
 
 //以原始日期/时间重新插入电子邮件
 var response = Gmail.Users.Messages.insert（resource，'me'，
 null， {'internalDateSource'：'dateHeader'}）; 
 $ b Logger.log（插入的电子邮件ID是：％s，response.id）
} 
  

这将从电子邮件中删除附件并将其重新插入到您的邮箱中。

编辑/更新： 新的RegExp可处理HTML和纯文本电子邮件 - 现在应该可以在多个边界字符串上工作

Using Google Apps Script (http://script.google.com), I know from the docs, how to send, forward, move to trash messages, etc. but I don't find how to remove a file attachement of an email, i.e.:

1. keep the text content (either in HTML or just plain text would be fine)
2. keep the original sender, keep the recipient
3. keep the original message date/hour (important!)
4. remove the attachment

If it's not possible via the API, is there a way to resend the message to myself, while keeping 1, 2 and 3?

---

Note: the GmailAttachment class looks interesting and allows to list recipients:

var threads = GmailApp.getInboxThreads(0, 10);
 var msgs = GmailApp.getMessagesForThreads(threads);
 for (var i = 0 ; i < msgs.length; i++) {
   for (var j = 0; j < msgs[i].length; j++) {
     var attachments = msgs[i][j].getAttachments();
     for (var k = 0; k < attachments.length; k++) {
       Logger.log('Message "%s" contains the attachment "%s" (%s bytes)',
                  msgs[i][j].getSubject(), attachments[k].getName(), attachments[k].getSize());
     }
   }
 }

but I don't find how to remove an attachment.

Note: I've already studied many other solutions for doing this, I've already read nearly every article about this (solutions with dedicated web services, with local clients like Thunderbird + Attachment extractor plugin, etc.), but none of them are really really cool. That's why I was looking for a solution to do it manually via Google Apps Script.

解决方案

Looks like messages will have to be re-created-ish:

Messages are immutable: they can only be created and deleted. No message properties can be changed other than the labels applied to a given message.

Using Advanced Gmail Service with the Gmail API insert() you can hack your way around it using: Gmail.Users.Messages.insert(resource, userId)

This advanced service must be enabled before use.

Example: [fill in the EMAIL_ID with an email_id or in whatever way you want to get the email]

function removeAttachments () {
  // Get the `raw` email
  var email = GmailApp.getMessageById("EMAIL_ID").getRawContent();

  // Find the end boundary of html or plain-text email
  var re_html = /(-*\w*)(\r)*(\n)*(?=Content-Type: text\/html;)/.exec(email);
  var re = re_html || /(-*\w*)(\r)*(\n)*(?=Content-Type: text\/plain;)/.exec(email);

  // Find the index of the end of message boundary
  var start = re[1].length + re.index;
  var boundary = email.indexOf(re[1], start);

  // Remove the attachments & Encode the attachment-free RFC 2822 formatted email string
  var base64_encoded_email = Utilities.base64EncodeWebSafe(email.substr(0, boundary));
  // Set the base64Encoded string to the `raw` required property
  var resource = {'raw': base64_encoded_email}

  // Re-insert the email into the user gmail account with the insert time
  /* var response = Gmail.Users.Messages.insert(resource, 'me'); */

  // Re-insert the email with the original date/time 
  var response = Gmail.Users.Messages.insert(resource, 'me', 
                      null, {'internalDateSource': 'dateHeader'});

  Logger.log("The inserted email id is: %s",response.id)
}

This will remove the attachments from the email and re-insert it into your mailbox.

edit/update: New RegExp to work with html&plain-text only emails - should now work on multiple boundary strings

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