使用Gmail API发送的邮件中缺少附件,但仅适用于收件人

Question

在Javascript中使用Gmail API发送带有HTML正文和~100KB PDF附件的邮件时,附件会正确显示在发件人的Gmail已发送文件夹中的邮件中,但不会显示在收件人的邮件中.

API调用是POST:

https://www.googleapis.com/upload/gmail/v1/users/me/messages/send?uploadType=media

发送给API的请求正文是:

{
  "headers": {
    "Authorization": "Bearer authToken-removedForThisPost"
  },
  "method": "POST",
  "contentType": "message/rfc822",
  "contentLength": 134044,
  "payload": "exampleBelow",
  "muteHttpExceptions": true
}

这是有效载荷的样子:

MIME-Version: 1.0
To: =?utf-8?B?TWlrZSBD?=<recipient@test.com>
CC: =?utf-8?B?TWlrZSBD?=<secondrecipient@gmail.com>
BCC: =?utf-8?B??=<bccrecipient@test.com>
From: =?utf-8?B?TWlrZSBxWXsd2lr?=<sender@test.com>
Subject: =?utf-8?B?subjectLine-removedForThisPost?=
Content-Type: multipart/alternative; boundary=__boundary__

--__boundary__
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: base64

base64EncodedStringHere-removedForThisPost

--__boundary__
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: base64

base64EncodedStringHere-removedForThisPost

--__boundary__
Content-Type: application/pdf; name="File Name.pdf"
Content-Disposition: attachment; filename="File Name.pdf"
Content-Transfer-Encoding: base64

base64EncodedStringHere-removedForThisPost

--__boundary__--

注意:Gmail API上传附件文档指出,上传简单附件(5MB以下)时Content-Length需要.我做了它,以便我的代码生成PDF附件的总字节数的整数值.但是,我注意到它Content-Length没有包含在有效载荷中.

我尝试将multipart/alternative邮件的内容类型更改为multipart/mixed- 这使得PDF附件正确附加到收件人的邮件,但邮件的HTML正文呈现为纯文本(显示HTML标记),并且另一个名为noname.html的附件,其中包含呈现为HTML的HTML内容.

我需要这样做,以便收件人邮件中的电子邮件同时具有HTML呈现的正文和PDF附件.

更新:我在这里上传了原始电子邮件的示例.所述发送消息是在左边,而接收到的消息是在右边.

Answer 1

只需更换：

Content-Type: multipart/alternative; boundary=__boundary__

为了：

Content-Type: multipart/mixed; boundary=__boundary__

这是我用 JS 编写的完整函数

函数 createMimeMessage_(msg) {

var nl = "\n"; var边界 = " ctrlq_dot_org ";

var mimeBody = [

"MIME-Version: 1.0",
"To: "      + msg.to.email,//+ encode_(msg.to.name) + "<" + msg.to.email + ">",
"Cc: "      + msg.cc.email,
"Bcc: "      + msg.bcc.email,
"From: "    + msg.from.email,//+ encode_(msg.from.name) + "<" + msg.from.email + ">",
"Subject: " + encode_(msg.subject), // takes care of accented characters
"In-Reply-To: " + (msg.reply_to || ""),
"References: " + (msg.reply_to || ""),

"Content-Type: multipart/mixed; boundary=" + boundary + nl,
"--" + boundary,

// "Content-Type: text/plain; charset=UTF-8",
// "Content-Transfer-Encoding: 7bit",
// "Content-Disposition: inline" + nl,
// msg.body.text + nl,
// "--" + boundary,

"Content-Type: text/html; charset=UTF-8",
"Content-Transfer-Encoding: base64" + nl,
new Buffer(msg.body.text).toString('base64') + nl,

];

for (var i = 0; i < msg.files.length; i++) {

var attachment = [
  "--" + boundary,
  "Content-Type: " + msg.files[i].mimeType + '; name="' + msg.files[i].fileName + '"',
  'Content-Disposition: attachment; filename="' + msg.files[i].fileName + '"',
  "Content-Transfer-Encoding: base64" + nl,
  msg.files[i].bytes
];

mimeBody.push(attachment.join(nl));

}

mimeBody.push("--" + 边界 + "--"); //console.log(mimeBody);

返回 mimeBody.join(nl);

}