使用来自 node.js 的 AWS SES 在邮件中上传 .jpg 图像附件

Question

以下是来自https://github.com/andrewpuch/aws-ses-node-js-examples的代码，其中有一个示例可以发送和通过电子邮件发送附件，

我修改了代码以从 aws s3 获取图像文件并将其与邮件作为附件一起发送，当我为文本文件执行此操作时，它运行良好，但是当我发送图像时，在邮件中我无法看到图像，因为它已损坏。

当我尝试使用苹果照片应用程序打开时，它显示缺少元数据，我还在邮件标题中添加了 Content-Transfer-Encoding: base64，当我在Content 中尝试使用 utf8、utf-8 和 UTF-8 时-Transfer-Encoding在标题中我从 aws 得到以下响应

{
  "message": "Unknown encoding: utf8",
  "code": "InvalidParameterValue",
  "time": "2017-03-14T08:42:43.571Z",
  "requestId": "2e220c33-0892-11e7-8a5a-1114bbc28c3e",
  "statusCode": 400,
  "retryable": false,
  "retryDelay": 29.798455792479217
}

我修改后的代码用于发送带有邮件的图像附件，我什至尝试将缓冲区编码为 utf-8、base-64，在此上浪费了足够的时间，不知道为什么它已损坏，如果有人以前这样做过，请帮助我

// Require objects.
var express = require('express');
var app = express();
var aws = require('aws-sdk');

// Edit this with YOUR email address.
var email = "*******@gmail.com";

// Load your AWS credentials and try to instantiate the object.
aws.config.loadFromPath(__dirname + '/config.json');

// Instantiate SES.
var ses = new aws.SES();
var s3 = new aws.S3();

// Verify email addresses.
app.get('/verify', function (req, res) {
    var params = {
        EmailAddress: email
    };

    ses.verifyEmailAddress(params, function (err, data) {
        if (err) {
            res.send(err);
        }
        else {
            res.send(data);
        }
    });
});

// Listing the verified email addresses.
app.get('/list', function (req, res) {
    ses.listVerifiedEmailAddresses(function (err, data) {
        if (err) {
            res.send(err);
        }
        else {
            res.send(data);
        }
    });
});

// Deleting verified email addresses.
app.get('/delete', function (req, res) {
    var params = {
        EmailAddress: email
    };

    ses.deleteVerifiedEmailAddress(params, function (err, data) {
        if (err) {
            res.send(err);
        }
        else {
            res.send(data);
        }
    });
});

// Sending RAW email including an attachment.
app.get('/send', function (req, res) {
    var params = { Bucket: 's3mailattachments', Key: 'aadhar.jpg' };
    var attachmentData;
    s3.getObject(params, function (err, data) {
        if (err)
            console.log(err, err.stack); // an error occurred
        else {
            console.log(data.ContentLength);
            console.log(data.ContentType);
            console.log(data.Body);
            var ses_mail = "From: 'AWS Tutorial Series' <" + email + ">\n";
            ses_mail = ses_mail + "To: " + email + "\n";
            ses_mail = ses_mail + "Subject: AWS SES Attachment Example\n";
            ses_mail = ses_mail + "MIME-Version: 1.0\n";
            ses_mail = ses_mail + "Content-Type: multipart/mixed; boundary=\"NextPart\"\n\n";
            ses_mail = ses_mail + "--NextPart\n";
            ses_mail = ses_mail + "Content-Type: text/html; charset=us-ascii\n\n";
            ses_mail = ses_mail + "This is the body of the email.\n\n";
            ses_mail = ses_mail + "--NextPart\n";
            ses_mail = ses_mail + "Content-Type: image/jpeg; \n";
            ses_mail = ses_mail + "Content-Disposition: attachment; filename=\"aadhar.jpg\"\n";
            ses_mail = ses_mail + "Content-Transfer-Encoding: base64\n\n"
            ses_mail = ses_mail + data.Body;
            ses_mail = ses_mail + "--NextPart";


            var params = {
                RawMessage: { Data: new Buffer(ses_mail) },
                Destinations: [email],
                Source: "'AWS Tutorial Series' <" + email + ">'"
            };

            ses.sendRawEmail(params, function (err, data) {
                if (err) {
                    res.send(err);
                }
                else {
                    res.send(data);
                }
            });

        }
    });
});

// Start server.
var server = app.listen(3003, function () {
    var host = server.address().address;
    var port = server.address().port;

    console.log('AWS SES example app listening at http://%s:%s', host, port);
});

Answer 1

首先，您的 MIME 消息格式不正确。 最后一行应该是--NextPart--而不仅仅是--NextPart 。

您还应该使用new Buffer(data.Body).toString('base64')将data.Body数组转换为其 base64 字符串表示，如下所示：

var ses_mail = "From: 'AWS Tutorial Series' <" + email + ">\n";
ses_mail += "To: " + email + "\n";
ses_mail += "Subject: AWS SES Attachment Example\n";
ses_mail += "MIME-Version: 1.0\n";
ses_mail += "Content-Type: multipart/mixed; boundary=\"NextPart\"\n\n";
ses_mail += "--NextPart\n";
ses_mail += "Content-Type: text/html; charset=us-ascii\n\n";
ses_mail += "This is the body of the email.\n\n";
ses_mail += "--NextPart\n";
ses_mail += "Content-Type: image/jpeg; \n";
ses_mail += "Content-Disposition: attachment; filename=\"aadhar.jpg\"\n";
ses_mail += "Content-Transfer-Encoding: base64\n\n"
ses_mail += new Buffer(data.Body).toString('base64');
ses_mail += "--NextPart--";

然后，您可以将ses_mail字符串作为原始消息数据传递为RawMessage: { Data: ses_mail }而不是RawMessage: { Data: new Buffer(ses_mail) } 。

Answer 2

解决此问题的另一种方法是将您的 nodemailer MailOptions 参数（内联图像附件cid:aadhar和所有）传递到 nodemailer composer 中，为您生成缓冲区数据，如下所示：

import MailComposer from 'nodemailer/lib/mail-composer';

new MailComposer( mailOptions )
    .compile()
    .build(( err, Data ) => {
        if( err !== null ) {
            process.stderr.write( err ); // for example
            return;
        }
        ses.sendRawEmail({
            RawMessage: {
                Data
            }
        });
    });

Ps：我使用笨重的callback技术来最小化答案的复杂性。 随意将构建调用包装在一个承诺中并异步/等待您的缓冲区数据，然后您可以将这些数据分别传递给您的ses.sendRawEmail方法。