Javascript jquery文件上传中间件与express.js：如何移动文件&；添加水印？

我设法用express.js 4.0进行了设置，但在配置时遇到了困难

以下是我的上传脚本：

var upload = require('jquery-file-upload-middleware');
upload.configure({
    imageVersions: {
        thumbs: {
            width: 80,
            height: 80
        },
        prev: {
            width: 1280,
            height: 1024
        }
    }
});

app.use('/admin/upload', function (req, res, next) {
    // imageVersions are taken from upload.configure()
    upload.fileHandler({
        uploadDir: function () {
            return __dirname + '/public/uploads/' + req.session.eventID;
        }
    })(req, res, next);

});

上传Chicken.jpg文件时，我得到以下结构：

/public/uploads/  -> public uploads folder
    534a8d502e889f8d6bf9cc07/  -> upload session folder
        prev/  -> resized version folder
            Chicken.jpg
        thumbs/    -> another resized version folder
            Chicken.jpg
        Chicken.jpg   -> original file

这就是我想要实现的目标：

将原始文件/public/uploads/534a8d502e889f8d6bf9cc07/Chicken.jpg移出/public/uploads文件夹，同时保留大小调整后的版本

在/public/uploads/534a8d502e889f8d6bf9cc07/prev/Chicken.jpg文件中添加水印

有人能给我建议吗

---

谢谢大家!

如何移动原始文件：

在网站上，它解释了如何移动文件，以及如果您阅读了他们的文档，如何移动带有自定义后缀（用户ID、会话ID等）的文件：

如果不想这样做，（）说明了如何使用节点将文件从一个位置移动到另一个位置。我将unlinkSync（）更改为unlink（）

向文件添加水印

说明如何使用node生成子进程并使用ImageMagick向图像添加水印：

    // Require our module dependencies
var exec = require('child_process').exec;

// Create command array to invoke ImageMagick composite where
// -dissolve is the amount of transparency for the watermark
// -gravity tells how to align images of varying size
// -quality is the image quality of the JPEG (not required if producing PNG)
var command = [
    'composite',
    '-dissolve', '50%',
    '-gravity', 'center', 
    '-quality', 100,
    pathToWatermarkJpg,
    pathToImageJpg,
    pathToResultJpg;
];

// Join command array by a space character and then execute command
exec(command.join(' '), function(err, stdout, stderr) {
    // Do stuff with result here
});

var fs = require('fs');
//var util = require('util');

var is = fs.createReadStream('source_file');
var os = fs.createWriteStream('destination_file');

is.pipe(os);
is.on('end',function() {
    fs.unlink('source_file', function(err){
         // Continue execution     
    });
});

/* node.js 0.6 and earlier you can use util.pump:
util.pump(is, os, function() {
    fs.unlink('source_file', function(err){
         // Continue execution
    });
});
*/

    // Require our module dependencies
var exec = require('child_process').exec;

// Create command array to invoke ImageMagick composite where
// -dissolve is the amount of transparency for the watermark
// -gravity tells how to align images of varying size
// -quality is the image quality of the JPEG (not required if producing PNG)
var command = [
    'composite',
    '-dissolve', '50%',
    '-gravity', 'center', 
    '-quality', 100,
    pathToWatermarkJpg,
    pathToImageJpg,
    pathToResultJpg;
];

// Join command array by a space character and then execute command
exec(command.join(' '), function(err, stdout, stderr) {
    // Do stuff with result here
});