如何将 GmailMessage 类的 getAttachments 中的内嵌图像传递到 MailApp 类的 sendEmail？ 代码：垃圾邮件：已发送邮件：参考：

问题描述

我想使用 GmailMessage's getAttachments 提取内嵌图像，然后通过 Class MailApp's sendEmail 发送它们。

问题在于前者返回一组 Blob 附件，而后者需要一个 JavaScript 对象，其中包含从图像键（字符串）到图像数据 Blob 的映射。

示例代码 - 棘手的部分是 {...,inlineImages: attachments,...}：

function test() {
  var firstThread = GmailApp.getTrashThreads(0,1)[0];
  var message = firstThread.getMessages()[0];
  var from = message.getHeader('From');
  var attachments = message.getAttachments({includeAttachments: false});
  var obj = {htmlBody: message.getBody(),noreply: false,replyTo: message.getFrom(),name: from};
  MailApp.sendEmail("[e-mail]",'Testing','',obj);
}

示例 EML 消息（注意 <img src="cid:key" 的 text/html 用法）：

MIME-Version: 1.0
Date: Thu,22 Jul 2021 23:06:23 +0300
Message-ID: <[e-mail]>
Subject: Testing
From: Me <[e-mail]>
To: Someone <[e-mail]>
Content-Type: multipart/related; boundary="0000000000004aee5205c7bbd26b"

--0000000000004aee5205c7bbd26b
Content-Type: multipart/alternative; boundary="0000000000004aee5005c7bbd26a"

--0000000000004aee5005c7bbd26a
Content-Type: text/plain; charset="UTF-8"

This is an inline image:
[image: image.png]
And here's another:
[image: image.png]
Thanks!

--0000000000004aee5005c7bbd26a
Content-Type: text/html; charset="UTF-8"
Content-transfer-encoding: quoted-printable

<div dir=3D"ltr">This is an inline=C2=A0image:<div><div dir=3D"ltr" class=
=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"></=
div></div></div><div><img src=3D"cid:ii_krfchaks0" alt=3D"image.png" width=
=3D"117" height=3D"118"><br></div><div>And here&#39;s another:</div><div><i=
mg src=3D"cid:ii_krfchlll1" alt=3D"image.png" width=3D"41" height=3D"47"><b=
r></div><div>Thanks!</div></div>

--0000000000004aee5005c7bbd26a--
--0000000000004aee5205c7bbd26b
Content-Type: image/png; name="image.png"
Content-disposition: attachment; filename="image.png"
Content-transfer-encoding: base64
X-Attachment-Id: ii_krfchaks0
Content-ID: <ii_krfchaks0>


--0000000000004aee5205c7bbd26b
Content-Type: image/png; name="image.png"
Content-disposition: attachment; filename="image.png"
Content-transfer-encoding: base64
X-Attachment-Id: ii_krfchlll1
Content-ID: <ii_krfchlll1>


--0000000000004aee5205c7bbd26b--

解决方法

原来 Google Apps Script 支持 matchAll，这意味着它可以像这样被拉下来：

function test() {
  var firstThread = GmailApp.getTrashThreads(0,1)[0];
  var message = firstThread.getMessages()[0];
  var from = message.getHeader('From');
  var attachments = message.getAttachments({includeAttachments: false}),inline_images = {};
  var regex = new RegExp('<img src="cid:(.*?)"','ig');
  var i=-1,matches = message.getBody().matchAll(regex)
  for (const match of matches) {
        i++;
        inline_images[match[1]] = attachments[i].copyBlob();
  }
  var obj = {htmlBody: message.getBody(),inlineImages: attachments,noReply: false,replyTo: message.getFrom(),name: from};
  MailApp.sendEmail("[e-mail]",'Testing','',obj);
}

,

根据 Cooper 的评论，您需要遍历数组。然后生成一个字符串，其中包含具有唯一键的标签。请参阅下面的代码。

代码：

function test() {
  var firstThread = GmailApp.getTrashThreads(0,1)[0];
  var message = firstThread.getMessages()[0];
  var from = message.getHeader('From');
  var attachments = message.getAttachments();
  // contains key - blob pair
  var images = {};
  // contains the string built up containing usage of inlineImages
  var imageString = ''; 
  // used for assigning unique name per attachment
  var index = 1; 

  for (attachment of attachments) {
    // create unique name per attachment
    var key = 'image' + index;
    // assign blob of each attachment to the unique key
    images[key] = attachment.copyBlob();
    // generate string containing the inline image tag
    imageString += key + " attachment <img src='cid:" + key + "'><br>";   
    index++;
  }

  MailApp.sendEmail({
    to: "[e-mail]",subject: "Testing",// appended the string generated to the original body
    htmlBody: message.getBody() + imageString,// images obj assigned to inlineImages
    inlineImages: images,name: from
  });
}

垃圾邮件：

已发送邮件：

参考：

• sendEmail(message)