Nodejs 和 Mailgun：从文件系统发送生成的附件 * 不是 *

问题描述

我在节点应用程序中生成附件并希望使用 Mailgun 发送它们。我无法访问文件系统（Netlify 函数）。

有没有简单的方法可以做到这一点？

洞图

这是一个 Jamstack（Gatsby/React、Netlify、Mailgun）网络应用。客户配置和请求报价。浏览器生成和发布提供和图像到 Netlify 函数（获取 api）。该函数发送附有 PDF 报价和图像的报价邮件。

我测试的代码（编辑：02/25）

const path = require('path');
const fs = require('fs');
const mailgun = require('mailgun-js')
const FormData = require('form-data');
const { Readable } = require('stream');

const API_KEY = 'SECRET';
const DOMAIN = 'brasilius.de';

const mg = mailgun({apiKey: API_KEY,domain: DOMAIN,host: "api.eu.mailgun.net"});

const stream = fs.createReadStream('test.txt');                     // This works
/* {
  id: '<[e-mail]>',message: 'Queued. Thank you.'
} */

/*
const stream = Readable.from(["Send this text as attachment."])   // Won't work

{ message: "'from' parameter is missing" }
*/

const data = {
  from: 'Excited User <[e-mail]>',to: '[e-mail]',subject: 'Hello',text: 'Testing some Mailgun awesomeness!',attachment: stream
};

mg.messages().send(data,(error,body) => {
  console.log(body);
});

解决方法

我找到的最简单的解决方案 here

// https://thecodebarbarian.com/sending-emails-using-the-mailgun-api.html

const mailgun = require('mailgun-js')

const mg = mailgun({apiKey: process.env.API_KEY,domain: process.env.DOMAIN,host: "api.eu.mailgun.net"});

const filename = 'test.txt';
const text = "Example test content."
const attch = new mg.Attachment({data: Buffer.from(text),filename: filename})

const data = {
  from: process.env.FROM,to: process.env.TO,subject: 'Hello',text: 'Testing Mailgun attachments.',attachment: attch
};

mg.messages().send(data,(error,body) => {
  console.log(body);
});

正如@Joe 所推荐的，Nodemailers Mailcomposer 的解决方案：

// See: https://documentation.mailgun.com/en/latest/api-sending.html#examples
// See: http://nodemailer.com/extras/mailcomposer/#attachments

const mailgun = require('mailgun-js')
const MailComposer = require('nodemailer/lib/mail-composer');

const mg = mailgun({apiKey: process.env.API_KEY,host: "api.eu.mailgun.net"});

const mailOptions = {
  from: process.env.FROM,attachments: [
    { // utf-8 string as an attachment
      filename: 'text.txt',content: 'For testing just a text file. This could be a ReadStream,Buffer or other.'
    }
  ]
};

const mail = new MailComposer(mailOptions);

mail.compile().build(function(mailBuildError,message) {

  var dataToSend = {
    to: process.env.TO,message: message.toString('ascii')
  };

  mg.messages().sendMime(dataToSend,function(sendError,body) {
    if (sendError) {
      console.log(sendError);
      return;
    }
  });
});