Gmail API发件人未发送多个附件 [英] Gmail API sender not sending multiple attachments

问题描述

我正在使用Gmail API通过JavaScript发送电子邮件。文字加上一个附件可以正常工作。但是，当我尝试发送两个附件时，只有第一个附件被附加，而另一个附件没有任何附件。我构建消息的代码是：

I am using Gmail API to send an email in JavaScript. It's working fine for text plus one attachment. But when I try to send two attachments, only the first one gets attached, and nothing for the other one. My code for building the message is:

  var nl = '\n';
  var boundary = "__myapp__";

const messageParts = [
        'MIME-Version: 1.0',
        'Content-Transfer-Encoding: 7bit',
        'From: XXXX Support <[e-mail]>',
        'To: Moin <' + event.email + '>',
        'subject: ' + utf8Subject,
        'Content-Type: multipart/mixed; boundary=' + boundary + nl,
        '--' + boundary,
        'Content-Type: text/plain; charset=UTF-8',
        'Content-Transfer-Encoding: 7bit' + nl,
        messageBody+ nl,
        '--' + boundary,
        'Content-Type: Application/pdf; name=' + testFileName,
        'Content-Disposition: attachment; filename=' + testFileName,
        'Content-Transfer-Encoding: base64' + nl,
        testFile.Body.toString('base64'),
        '--' + boundary,
        'Content-Type: Application/pdf; name=' + testFileName,
        'Content-Disposition: attachment; filename=' + testFileName,
        'Content-Transfer-Encoding: base64',
        testFile.Body.toString('base64'),
        '--' + boundary + '--'
      ]

之后，我从数组中创建一个字符串。上面的代码只是测试一次，将相同的6k小附件附加两次，以避免与限制有关。我认为在以某种方式构建消息方面存在错误，但是无法确定在哪里。

After this I create a string from the array. The code above is just testing with attaching the same small attachment of 6k twice, to avoid anything to do with limits. I think I have an error in how I've built the message somehow, but can't work out where.

推荐答案

在您的第一个附件：

 'Content-Type: Application/pdf; name=' + testFileName,
    'Content-Disposition: attachment; filename=' + testFileName,
    'Content-Transfer-Encoding: base64' + nl,
    testFile.Body.toString('base64'),
    '--' + boundary,

在第二个附件中：

    'Content-Type: Application/pdf; name=' + testFileName,
    'Content-Disposition: attachment; filename=' + testFileName,
    'Content-Transfer-Encoding: base64',
    testFile.Body.toString('base64'),

您缺少 content-transfer-encoding标题项的尾随换行符。

You are missing the trailing newline for the "content-transfer-encoding" header item.

我强烈建议使用现有的库来编写MIME消息，因此您不必担心这些细节。请参阅： https://www.npmjs.com/package/mimemessage

I strongly suggest using an existing library to compose MIME message, so you don't have to worry about these details. See: https://www.npmjs.com/package/mimemessage

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