发送附件nodemailer而不将文件存储在服务器中答案

【问题标题】：send attachement nodemailer wihout storing file in server发送附件nodemailer而不将文件存储在服务器中
【发布时间】：2021-06-09 11:21:58
【问题描述】：

我正在寻找一种使用 nodemailer、multer、express 发送附件的方法，而无需将文件存储在服务器中。

这是我的实际 sendEmai 功能，我想更新它以便我可以发送附件

exports.sendMail = (req, res) => {
 let credentials=await Integration_mail.findOne({
    where: {
      userId: req.body.userId,
    },
  })
    
      //decrypt password
      var bytes = CryptoJS.AES.decrypt(
        credentials.password,
        secretconfig.secret
      );
      var originalPwd = bytes.toString(CryptoJS.enc.Utf8);
  let transporter = nodemailer.createTransport({
    host: credentials.host_smtp,
    port: 587,
    secure: false, // upgrade later with STARTTLS
    auth: {
      user: credentials.user,
      pass: originalPwd,
    },
  });

  const { destMail, subject, text } = req.body;

  var mailOptions = {
    from: credentials.user,
    to: destMail,
    subject: subject,
    text: text,
  };
  transporter.sendMail(mailOptions, function (error, info) {
    if (error) {
      return res.status(500).json({ msg: error });
    } else {
      return res.status(200).json({ msg: 'email sent' });
    }
  });
})

});
};

感谢您的帮助

【问题讨论】：

标签： node.js express multer nodemailer

【解决方案1】：

所以经过一段时间的研究，我使用表单数据上传文件并仅使用我通过 nodemailer 发送文件的缓冲区，而无需将其上传到服务器并使用其路径。代码如下：

  let transporter = nodemailer.createTransport({
  host: host_smtp,
  secureConnection: false, // TLS requires secureConnection to be false
  port: 587, // port for secure SMTP
  tls: {
    ciphers: "SSLv3",
  },
  auth: {
    user: credentials.email,
    pass: credentials.password,
  },
});

const { to, subject, text, cc, bcc } = req.body;
let attachments = [];
if (req.files) {
    let files = req.files.file;
//if its an array of files I preferred to not allow uploads > 20Mb
  if (Array.isArray(files)) {
    size = files.reduce((acc, file) => acc + file.size, 0);
    if (size > 20971520)
      return res.status(500).json({ message: "files size cannot be greater than 20MB" });

    attachments = files.map((file) => ({
      filename: file.name,
      content: file.data,
      encoding: file.encoding,
    }));
  } else {
    if (files.size > 20971520)
      return res.status(500).json({ message: "files size cannot be greater than 20MB" });
    attachments = [
      {
        filename: files.name,
        content: files.data,
        encoding: files.encoding,
      },
    ];
  }
}
const mailOptions = {
  from: credentials.email,
  to: to,
  cc: cc,
  bcc: bcc,
  subject: subject,
  html: text,
  attachments: attachments,
};
await transporter.sendMail(mailOptions);

这是使用表单数据的请求正文的屏幕截图

这里是官方文档的参考： https://nodemailer.com/message/attachments/

【讨论】：

是的，这可能是最好的方法。 req.file 具有 Buffer 类型，并且 nodemailer 在 attachments 属性中也接受 Buffer 类型。