邮件附件媒体类型错误的Gmail API

编辑

第一部分代码适用于总大小为mb的附件。如果要使用允许的35 mb的限制，请在答案末尾检查编辑。

在Steve将我推向正确的方向（整个邮件必须在“原始”参数中）之后，我简单地尝试了Python API并查看了由此生成的邮件。

没有附件的邮件

Content-Type: text/plain; charset="UTF-8"MIME-Version: 1.0Content-Transfer-Encoding: 7bitto: receiver@gmail.comfrom: sender@gmail.comsubject: Subject TextThe actual message text goes here

带附件的邮件

Content-Type: multipart/mixed; boundary="foo_bar_baz"MIME-Version: 1.0to: receiver@gmail.comfrom: sender@gmail.comsubject: Subject Text--foo_bar_bazContent-Type: text/plain; charset="UTF-8"MIME-Version: 1.0Content-Transfer-Encoding: 7bitThe actual message text goes here--foo_bar_bazContent-Type: image/jpegMIME-Version: 1.0Content-Transfer-Encoding: base64Content-Disposition: attachment; filename="example.jpg"{JPEG data}--foo_bar_baz--

因此，我只是围绕此代码编写了代码，并且效果很好！

var reader = new FileReader();reader.readAsDataURL(attachment);reader.onloadend = function (e) {  // The relevant base64-encoding comes after "base64,"  var jpegData = e.target.result.split('base64,')[1];  var mail = [    'Content-Type: multipart/mixed; boundary="foo_bar_baz"rn',    'MIME-Version: 1.0rn',    'to: receiver@gmail.comrn',    'from: sender@gmail.comrn',    'subject: Subject Textrnrn',    '--foo_bar_bazrn',    'Content-Type: text/plain; charset="UTF-8"rn',    'MIME-Version: 1.0rn',    'Content-Transfer-Encoding: 7bitrnrn',    'The actual message text goes herernrn',    '--foo_bar_bazrn',    'Content-Type: image/jpegrn',    'MIME-Version: 1.0rn',    'Content-Transfer-Encoding: base64rn',    'Content-Disposition: attachment; filename="example.jpg"rnrn',    jpegData, 'rnrn',    '--foo_bar_baz--'  ].join('');  // The Gmail API requires url safe base64   // (replace '+' with '-', replace '/' with '_', remove trailing '=')  mail = btoa(mail).replace(/+/g, '-').replace(///g, '_').replace(/=+$/, '');  $.ajax({    type: "POST",    url: "https://www.googleapis.com/gmail/v1/users/me/messages/send",    headers: {      'Authorization': 'Bearer ' + accessToken,      'Content-Type': 'application/json'    },    data: JSON.stringify({      raw: mail    })  });}

编辑

上面的代码有效，但是需要一些更改才能使用最大限制为35 mb。

以标题为 Mail with attachment的邮件 为例，更改后的ajax-request如下所示：

$.ajax({  type: "POST",  url: "https://www.googleapis.com/gmail/v1/users/me/messages/send?uploadType=multipart",  headers: {    'Authorization': 'Bearer ' + accessToken,    'Content-Type': 'message/rfc822'  },  data: mail});

在

Content-Type

message/rfc822

application/json

uploadType=multipart

rfc822