Nodejs send stream via email

user_10443788 0
Viewed 780

I'm trying to send my stream data via email using Nodemailer but for some reason, the attachment is coming up as 0 kb when I download it and look at its info. How can I properly send the stream & it's data as an attachment? The stream should contain a PKPass is it a better option to send the response as an attachment? I'm using passkit-generator to generate the 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: 'email4@gmail.com',
            pass: 'password',
        },
    });

    let mailOptions = {
        from: 'email4@gmail.com',
        to: 'emailTo1@gmail.com',
        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);
    });

});
nodemailer node.js
3 Answers

It seems that in this case, the only way to send the file is to read the entire stream and send it as a string or buffer:

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: 'email4@gmail.com',
            pass: 'password',
        },
    });

    const mailOptions = {
        from: 'email4@gmail.com',
        to: 'emailTo1@gmail.com',
        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);
    });

});

BUT! You need to be careful with this approach if the file is large, as it is fully loaded into RAM.

user_97662880

Your problem is that you piped the stream to res which is a "StreamReader" aka consumer, instead you need just to pass it to nodeMailer which it is a StreamReader by itself.

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: 'email4@gmail.com',
      pass: 'password',
    },
  });

  let mailOptions = {
    from: 'email4@gmail.com',
    to: 'emailTo1@gmail.com',
    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);
  });
});

This is how I'm streaming email attachments.

user_65393170

hi way i have this issues ? `file:///home/racal/JavaScript/Node/Web-Env/webpack.config.dev.js:10 path.resolve(__dirname, 'src/index') ^

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)

`

user_115559080
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