带有附件的电子邮件无法与gmail API一起正常运行 [英] Email with attachment is not going properly with gmail api

问题描述

这是我在node.js中编写的以下代码，用于使用gmail api发送带有附件的电子邮件:

This is the following piece of code I have written in node.js for sending email with attachment using gmail api:

我正在使用节点js的request-promise模块将请求发送到该api.

And I am using request-promise module of node js to send request to that api.

let user = await db.model('User').findOne({ _id: userId });
    let filepath = fs.readFileSync(req.file.path).toString('base64');
    // let filepath = fs.readFileSync(req.file.path);
    let from = user.crmOptions.email;
    let raw = [
      'Content-Type: multipart/mixed; boundary="boundary_mail"\r\n',
      'MIME-Version: 1.0\r\n',
      "to: ", req.body.to, "\n",
      "from: ", from, "\n",
      "cc: ", req.body.cc ? req.body.cc : '', "\n",
      "bcc: ", req.body.bcc ? req.body.bcc : '', "\n",
      "subject: ", req.body.subject, "\n\n",

      '--boundary_mail\r\n',
      "Content-Type: text/html; charset=\"UTF-8\"\n",
      'MIME-Version: 1.0\r\n',
      req.body.message,

      '--boundary_mail\r\n',
      `Content-Type: ${req.file.mimetype}\r\n`,
      'MIME-Version: 1.0\r\n',
      `Content-Disposition: attachment; filename="${req.file.filename}"\r\n\r\n`,

      filepath, '\r\n\r\n',

      '--boundary_mail--'
    ].join('');
    const id = 'me';
    let options = {
      url: "https://www.googleapis.com/upload/gmail/v1/users/" + id + "/messages/send?uploadType=multipart",
      method: 'POST',
      headers: {
        'Authorization': `Bearer ${user.crmOptions.access_token}`,
        'Content-Type': 'message/rfc822'
      },
      body: raw
    };


await request(options).then(async body => {
  console.log("Body: ", body);
}).catch(err => {
  console.log("Error: ", err);
})

发送邮件后，邮件内容会变成这样

Mail content is going like this after sending mail

推荐答案

发送html邮件和附件文件时，它使用multipart/mixed和multipart/alternative.请求正文的结构如下.

When html mail and attachment file are sent, it uses multipart/mixed and multipart/alternative. The structure of request body is as follows.

• 多份/混合
  • 多部分/替代
    • html消息
    • multipart/mixed
      • multipart/alternative
        • html message

        当时，请求正文中使用了2个边界.

        At that time, 2 boundaries are used in the request body.

        请如下修改raw.

        let raw = [
          'MIME-Version: 1.0\n',
          "to: ", req.body.to, "\n",
          "from: ", from, "\n",
          "cc: ", req.body.cc ? req.body.cc : '', "\n",
          "bcc: ", req.body.bcc ? req.body.bcc : '', "\n",
          "subject: ", req.body.subject, "\n",
          "Content-Type: multipart/mixed; boundary=boundary_mail1\n\n",
        
          "--boundary_mail1\n",
          "Content-Type: multipart/alternative; boundary=boundary_mail2\n\n",
        
          "--boundary_mail2\n",
          "Content-Type: text/html; charset=UTF-8\n",
          "Content-Transfer-Encoding: quoted-printable\n\n",
          req.body.message, "\n\n",
          "--boundary_mail2--\n",
        
          '--boundary_mail1\n',
          `Content-Type: ${req.file.mimetype}\n`,
          `Content-Disposition: attachment; filename="${req.file.filename}"\n`,
          "Content-Transfer-Encoding: base64\n\n",
        
          filepath, '\n',
          '--boundary_mail1--',
        ].join('');
        

        注意:

        • 在此经过修改的脚本中，它假定您当前的脚本可以使用Gmail API发送电子邮件.
        • https://www.w3.org/Protocols/rfc1341/7_2_Multipart.html
        • http://qcode.co.uk/post/70
        • https://www.w3.org/Protocols/rfc1341/7_2_Multipart.html
        • http://qcode.co.uk/post/70

        例如，当请求正文中包含2个附件文件时，请按照以下说明从--boundary_mail1修改为--boundary_mail1--.请注意是否没有重复的文件名.

        For example, when 2 attachment files are included in the request body, please modify from --boundary_mail1 to --boundary_mail1-- as follows. Please be careful whether there are no duplicated filenames.

        '--boundary_mail1\n',
        `Content-Type: ${req.file.mimetype}\n`,
        `Content-Disposition: attachment; filename="${req.file.filename}"\n`,
        "Content-Transfer-Encoding: base64\n\n",
        
        filepath, '\n',
        '--boundary_mail1--',
        

        收件人:

        '--boundary_mail1\n',
        `Content-Type: mimetype\n`, // mimetype
        `Content-Disposition: attachment; filename="### filename1 ###"\n`, // filename1
        "Content-Transfer-Encoding: base64\n\n",
        
        filepath1, '\n', // filepath1
        '--boundary_mail1\n',
        `Content-Type: mimetype\n`, // mimetype
        `Content-Disposition: attachment; filename="### filename2 ###"\n`, // filename2
        "Content-Transfer-Encoding: base64\n\n",
        
        filepath2, '\n', // filepath2
        '--boundary_mail1--',
        

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