使用 Mailgun 从 Base64 字符串发送 pdf 附件

Question

我有一个由另一个函数生成的 pdf，它返回一个 Base64 字符串。然后我想将它附加到 Mailgun 电子邮件as attachment，即built into Meteor 和Mailgun。我看到有很多从file system 附加文件的示例，但我没有看到任何使用 Base64 的示例。

我有一个生成 Base64 字符串并用前缀连接的方法，以便convert Base64 to PDF：

//returns base64 string: looks like "YW55IGNhcm5hbCBwbGVhc3VyZQ=="
const base64AttachmentString = 'data:application/pdf;base64,' + generatePdfBase64();

import { Email } from "meteor/email";

Email.send({
  to: "email@example.com",
  from: "John Smith <johnsmith@example.com>",
  subject: "Sending Base64 as PDF",
  html: generatedHTMLTemplate,
  attachment: base64AttachmentString
});

有没有办法发送 Base64 附件，Mailgun 会将其识别为 PDF？我知道这对于其他邮件程序是可能的，例如 Nodemailer 和 SendGrid。

Answer 1

似乎流星的电子邮件要求您添加attachments 键，这应该是一个附件数组。

至于附件的选项 - there are multiple:

    {   // utf-8 string as an attachment
        filename: 'text1.txt',
        content: 'hello world!'
    },
    {   // binary buffer as an attachment
        filename: 'text2.txt',
        content: new Buffer('hello world!','utf-8')
    },
    {   // file on disk as an attachment
        filename: 'text3.txt',
        path: '/path/to/file.txt' // stream this file
    },
    {   // filename and content type is derived from path
        path: '/path/to/file.txt'
    },
    {   // stream as an attachment
        filename: 'text4.txt',
        content: fs.createReadStream('file.txt')
    },
    {   // define custom content type for the attachment
        filename: 'text.bin',
        content: 'hello world!',
        contentType: 'text/plain'
    },
    {   // use URL as an attachment
        filename: 'license.txt',
        path: 'https://raw.github.com/andris9/Nodemailer/master/LICENSE'
    },
    {   // encoded string as an attachment
        filename: 'text1.txt',
        content: 'aGVsbG8gd29ybGQh',
        encoding: 'base64'
    },
    {   // data uri as an attachment
        path: 'data:text/plain;base64,aGVsbG8gd29ybGQ='
    }

在你的例子中你可以使用：

const base64AttachmentString = 'data:application/pdf;base64,' + generatePdfBase64();

import { Email } from "meteor/email";

Email.send({
  to: "email@example.com",
  from: "John Smith <johnsmith@example.com>",
  subject: "Sending Base64 as PDF",
  html: generatedHTMLTemplate,
  attachments: [
    {
      path: base64AttachmentString
    }
  ]
});