Nodejs 通过电子邮件发送流

Question

我正在尝试使用Nodemailer通过电子邮件发送我的流数据，但由于某种原因，附件0 kb在我下载并查看其信息时出现。如何正确发送流及其数据作为附件？流应该包含一个PKPass将响应作为附件发送是否更好的选择？我正在使用passkit-generator来生成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);
    });

});

Answer 1

看来在这种情况下，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: '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);
    });

});

但！如果文件很大，则需要小心使用此方法，因为它已完全加载到 RAM 中。