使用來自 node.js 的 AWS SES 在郵件中上傳 .jpg 圖像附件

Question

以下是來自https://github.com/andrewpuch/aws-ses-node-js-examples的代碼，其中有一個示例可以發送和通過電子郵件發送附件，

我修改了代碼以從 aws s3 獲取圖像文件並將其與郵件作為附件一起發送，當我為文本文件執行此操作時，它運行良好，但是當我發送圖像時，在郵件中我無法看到圖像，因為它已損壞。

當我嘗試使用蘋果照片應用程序打開時，它顯示缺少元數據，我還在郵件標題中添加了 Content-Transfer-Encoding: base64，當我在Content 中嘗試使用 utf8、utf-8 和 UTF-8 時-Transfer-Encoding在標題中我從 aws 得到以下響應

{
  "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
}

我修改后的代碼用於發送帶有郵件的圖像附件，我什至嘗試將緩沖區編碼為 utf-8、base-64，在此上浪費了足夠的時間，不知道為什么它已損壞，如果有人以前這樣做過，請幫助我

// 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 消息格式不正確。 最后一行應該是--NextPart--而不僅僅是--NextPart 。

您還應該使用new Buffer(data.Body).toString('base64')將data.Body數組轉換為其 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，您可以將ses_mail字符串作為原始消息數據傳遞為RawMessage: { Data: ses_mail }而不是RawMessage: { Data: new Buffer(ses_mail) } 。

Answer 2

解決此問題的另一種方法是將您的 nodemailer MailOptions 參數（內聯圖像附件cid:aadhar和所有）傳遞到 nodemailer composer 中，為您生成緩沖區數據，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技術來最小化答案的復雜性。 隨意將構建調用包裝在一個承諾中並異步/等待您的緩沖區數據，然后您可以將這些數據分別傳遞給您的ses.sendRawEmail方法。