Nodejs通过电子邮件发送流

Question

我试图通过电子邮件发送我的流数据，使用的是 Nodemailer 但不知为何，该附件显示为 0 kb 当我下载它并查看它的信息时，我如何正确地发送流& 它的数据作为附件？我如何才能正确地将流& 它的数据作为附件发送？数据流应该包含一个 PKPass 以附件形式发送响应是否是一个更好的选择？我正在使用 passkit-generator 以产生 PKPass

const stream = examplePass.generate();

res.set({
    'Content-Type': 'application/vnd.apple.pkpass',
    'Content-disposition': `attachment; filename=${passName}.pkpass`,
});

stream.pipe(res);

//Send the receipt email

stream.on('finish', (attach) => {

    let transporter = nodemailer.createTransport({
        host: 'smtp.gmail.com',
        port: 587,
        secure: false,
        requireTLS: true,
        auth: {
            user: '[email protected]',
            pass: 'password',
        },
    });

    let mailOptions = {
        from: '[email protected]',
        to: '[email protected]',
        subject: 'You\'re on your way to ',
        html: '<h1>Reciept email</h1>',
        attachments: [
            {
                filename: 'Event.pkpass',
                contentType: 'application/vnd.apple.pkpass',
                content: stream,
            },
        ],
    };

    transporter.sendMail(mailOptions, (error, info) => {
        if (error) {
            return console.log(error.message);
        }
        console.log('success ' + info);
    });

});

Answer 1

似乎在这种情况下，发送文件的唯一方法是读取整个流，并将其作为一个字符串或缓冲区发送。

const stream = examplePass.generate();

res.set({
    'Content-Type': 'application/vnd.apple.pkpass',
    'Content-disposition': `attachment; filename=${passName}.pkpass`,
});

stream.pipe(res);

const chunks = [];

stream.on('data', chunk => {
    chunks.push(chunk);
});

stream.on('end', () => {
    const content = Buffer.concat(chunks);

    const transporter = nodemailer.createTransport({
        host: 'smtp.gmail.com',
        port: 587,
        secure: false,
        requireTLS: true,
        auth: {
            user: '[email protected]',
            pass: 'password',
        },
    });

    const mailOptions = {
        from: '[email protected]',
        to: '[email protected]',
        subject: 'You\'re on your way to ',
        html: '<h1>Reciept email</h1>',
        attachments: [
            {
                filename: 'Event.pkpass',
                contentType: 'application/vnd.apple.pkpass',
                content
            },
        ],
    };

    transporter.sendMail(mailOptions, (error, info) => {
        if (error) {
            return console.log(error.message);
        }
        console.log('success:', info);
    });

});

但是，如果文件很大的话，你需要小心使用这种方法，因为它是完全加载到RAM中的。

Answer 2

你的问题是，你把流传给了 res 是一个 "StreamReader"，也就是消费者，而你只需要把它传递给nodeMailer，它本身就是一个StreamReader。

const stream = examplePass.generate();

// res.set({
//   'Content-Type': 'application/vnd.apple.pkpass',
//   'Content-disposition': `attachment; filename=${passName}.pkpass`,
// });

// stream.pipe(res); <- remove this

//Send the receipt email

stream.on('finish', (attach) => {
  let transporter = nodemailer.createTransport({
    host: 'smtp.gmail.com',
    port: 587,
    secure: false,
    requireTLS: true,
    auth: {
      user: '[email protected]',
      pass: 'password',
    },
  });

  let mailOptions = {
    from: '[email protected]',
    to: '[email protected]',
    subject: "You're on your way to ",
    html: '<h1>Reciept email</h1>',
    attachments: [
      {
        filename: 'Event.pkpass',
        contentType: 'application/vnd.apple.pkpass',
        content: stream,
      },
    ],
  };

  transporter.sendMail(mailOptions, (error, info) => {
    if (error) {
      return console.log(error.message);
    }
    console.log('success ' + info);
  });
});

这就是我的邮件附件流。

Answer 3

你好，我有这样的问题`file:/homeracalJavaScriptNodeWeb-Envwebpack.config.dev.js:10path.resolve(__dirname, 'srcindex')^。

ReferenceError: __dirname is not defined
at file:///home/racal/JavaScript/Node/Web-Env/webpack.config.dev.js:10:18
at ModuleJob.run (internal/modules/esm/module_job.js:138:23)
at async Loader.import (internal/modules/esm/loader.js:178:24)

`