如何使用Express multer加密文件 [英] How to encrypt file using express multer

问题描述

通过这些简单的几行代码，我已经将文件保存在服务器上.

By having these simple few lines of code I've got file saved on server.

router.post('/upload',  upload.single('file'), function(req: Request, res: Response, next: Function) {
    console.log(req.file);
    res.json({ success: true, message: 'Uploaded' });
});

我想在保存文件之前对其进行加密.

I want to encrypt the file before it is get saved.

有什么办法可以做到吗?

Is there any way I can do that?

推荐答案

• Multer提供了丰富的事件集，可以为您提供更好的服务
  控制文件上传.
• Multer provides a rich set of events which can give you better
  control over your file uploads.

因此，执行顺序为:

1. onParseStart
2. onFileUploadStart/onFileUploadData ...
3. onFileUploadComplete

4. onParseEnd

1. onParseStart
2. onFileUploadStart/onFileUploadData...
3. onFileUploadComplete

4. onParseEnd

• 对于加密，我们可以使用 文件加密器 节点模块.

因此，在这种情况下，您应该通过以下操作将加密过程保存在 onFileUploadComplete 中:

So,in your case your encrypting proccess should be in onFileUploadComplete by doing something like this:

    var fs = require('fs');       
    var encryptor = require('file-encryptor');
    var key = 'My Super Secret Key';          
    app.use(multer({      
            onFileUploadComplete: function (file) {
                 console.log(file.fieldname + ' uploaded to  ' + file.path);
             // Encrypt file.
               encryptor.encryptFile(file, 'encryptedFile.dat', key, function(err) {
                  // Encryption complete.remove original file
                   fs.unlink(file);
                         });
                       }
                   }));

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