Question

问题

所有数据都以文本格式发送，而不是以附件的形式发送。

我的代码

 var boundary = "__myapp__", nl = "\n";
 // var attach = data.toString("base64");
 var fileName = "abc.pdf";
 var attach = new Buffer(fs.readFileSync( "./"+fileName)) .toString("base64");
 var str = ["Content-Type: text/plain; charset=\"UTF-8\"\n",
 "MIME-Version: 1.0\n",
 "Content-Transfer-Encoding: 7bit\n",
 "to: ", to, "\n",
 "subject: ", subject, "\n\n",
 "Content-Type: multipart/alternate; boundary=" + boundary + nl,
 "--" + boundary,
 "Content-Type: text/plain; charset=UTF-8",
 "Content-Transfer-Encoding: 7bit" + nl,
 message+ nl,
 "--" + boundary,
 "--" + boundary,
 "Content-Type: Application/pdf; name=myPdf.pdf",
 'Content-Disposition: attachment; filename=myPdf.pdf',
 "Content-Transfer-Encoding: base64" + nl,
 attach,
 "--" + boundary + "--"
 ].join('');
 var encodedMail = new Buffer(str).toString("base64").replace(/\+/g, '-')
 .replace(/\//g, '_');
 resolve(encodedMail);

邮件的一部分如下

内容类型：multipart / alternate;边界= MyApp的 --_ myapp_Content-Type：text / plain; charset = UTF-8Content-Transfer-Encoding：7位测试消息 - myapp --_ myapp_Content-Type：Application / pdf; name = myPdf.pdfContent-Disposition：attachment; filename = myPdf.pdfContent-Transfer-Encoding：base64 JVBERi0xLjMgCiXi48 / TIAoxIDAgb2JqIAo8PCAKL1R5cGUgL0NhdGFsb2cgCi9QYWdlcyAyIDAgUiAKL1BhZ2VNb2RlIC9Vc2VOb25lIAovVmlld2VyUHJlZmVyZW5jZXMgPDwgCi9GaXRXaW5kb3cgdHJ1ZSAKL1BhZ2VMYXlvdXQgL1NpbmdsZVBhZ2UgCi9Ob25GdWxsU2NyZWVuUGFnZU1vZGUgL1VzZU5vbmUgCj4 +佑+ PiAKZW5kb2JqIAo1IDAgb2JqIAo8PCAKL0xlbmd0aCAyNjQzIAovRmlsdGVyIFsgL0ZsYXRlRGVjb2RlIF0gCj4 + IApzdHJlYW0KeJzdGWtT48jxu3 + FMYMkY8uep2bGkgADBrwseHntLYv3kspe9iqpbFK5fMjfT89LkuUH3H5J1UEVNZru6e7pdw94hEUXw2 + K3UpxMpLdr9872G7 / 9qtf3F92JMVdynGXYJ7xLsmY4N3f / tr5qfPPDu2 + A7Z / WhSSZRUO1YQYnIcOHilFu82 /// lq0RlhxKMLjA3yX + X + pqp91tyXZPO + wiLsU9HYJzzDFQPpAUIL6gT97tZWin + AnFKxzH199 + ssQIywTBkAIURx92EgVBEWQG4dznCc ...更多文本......最后...... == - myapp -

我认为使用附件发送邮件的模板可能存在一些问题。

任何人都可以在这里提供帮助。感谢

Answer 1

我能够通过使用适当的消息结构来附加PDF文件。设置正确的mimeType和边界非常重要。

@Tanaike指出的参考（https://stackoverflow.com/a/50540373/13664358）很有帮助！

这里是发送带有PDF附件的电子邮件的全部功能：

const subject = 'My Subject';
const utf8Subject = `=?utf-8?B?${Buffer.from(subject).toString('base64')}?=`;

var fileName = "mypdf.pdf";
var attach = new Buffer.from(fs.readFileSync("./" + fileName)).toString("base64");

var emailBody = 'My Email Message';

var messageParts = [
    "MIME-Version: 1.0",
    'From: Teste <teste@teste.com>',
    'To: Teste <teste@teste.com>',
    `Subject: ${utf8Subject}`,
    "Content-Type: multipart/mixed; boundary=012boundary01",
    '',
    "--012boundary01",
    "Content-Type: multipart/alternative; boundary=012boundary02",
    '',
    "--012boundary02",
    "Content-type: text/html; charset=UTF-8", 
    "Content-Transfer-Encoding: quoted-printable",
    '',
    emailBody,
    '',
    "--012boundary02--",
    "--012boundary01",
    "Content-Type: Application/pdf; name=mypdf.pdf",
    'Content-Disposition: attachment; filename=mypdf.pdf',
    "Content-Transfer-Encoding: base64",
    '',
    attach,
    "--012boundary01--",
]

const message = messageParts.join('\n');

// The body needs to be base64url encoded.
const encodedMessage = Buffer.from(message)
  .toString('base64')
  .replace(/\+/g, '-')
  .replace(/\//g, '_')
  .replace(/=+$/, '');

const gmail = google.gmail({version: 'v1', auth});
gmail.users.messages.send({
  userId: 'me',
  requestBody: {
      raw: encodedMessage
  }
}, (err, res) => {
  if (err) return console.log('The API returned an error: ' + err);
});

注意：上面的代码将Google api用于nodejs（https://www.npmjs.com/package/googleapis）

使用gmail api发送带附件的邮件（pdf）

1 个答案: