//自编了一个文件共享系统，everyone可上传下载，无权限控制，公网使用风险大，需完善
//所有文件将上传到./share/XXX目录下，可通过http://localhost:8080/share/XXX 访问并下载
//
package main

import (
    "fmt"
    "io"
    "io/ioutil"
    "os"
    "path/filepath"
    "sort"

    "github.com/kataras/iris"
)

const (
    upload_path string = "./share/"
)

//表示一个上传的文件
type Upfile struct {
    Url  string //位置，如share/XXX/
    Name string //文件名，如abc.doc
    Date string //文件时间,ModTime转string
}

//表示权限
type Allow struct {
    UP   bool //可上传
    Down bool //可下载
    Del  bool //可删除
}

type Updir []Upfile //表示一个目录当中，所有上传的文件
// 用Len Less Swap使Updir可排序，可用sort.Sort排序
func (d Updir) Len() int { return len(d) }

// Date降序
func (d Updir) Less(i, j int) bool {
    return d[i].Date > d[j].Date
}

// 交换
func (d Updir) Swap(i, j int) { d[i], d[j] = d[j], d[i] }

func main() {
    fmt.Println("OK!请访问  :8080/share")
    //启动一个http 服务器
    app := iris.New()
    //静态文件服务
    app.StaticWeb("/share", "./share")
    //注册视图目录
    tmpl := iris.HTML("./v", ".html")
    app.RegisterView(tmpl)
    //主页
    app.Get("/share", func(ctx iris.Context) {
        ctx.View("main.html")
    })
    //下载
    app.Get("/share/{path:alphabetical}", func(ctx iris.Context) {
        FlagAllowDel := false //允许删除文件标志
        //URL中的路径
        reqPath := ctx.Path()           //如：/share/aaa
        myfolder := "." + reqPath + "/" //如：./share/aaa/
        //获取执行文件路径：
        rootdir, err := filepath.Abs(filepath.Dir(os.Args[0])) //如：e:\goapp\myapp
        createf := rootdir + reqPath + "/"                     //如：e:\goapp\myapp/share/aaa/
        _, err = os.Stat(createf)                              //os.Stat获取文件信息
        //判断文件夹path存在，否则创建之    ,绝对路径
        if os.IsNotExist(err) {
            os.MkdirAll(createf, os.ModePerm)
        }
        //列出目录下的文件
        var upfile Upfile
        fileins := make(Updir, 0)
        files, _ := ioutil.ReadDir(myfolder)
        for _, file := range files {
            if file.IsDir() {
                continue
            } else {
                upfile.Name = file.Name()
                upfile.Url = ctx.Path() + "/" + file.Name()
                upfile.Date = file.ModTime().Format("2006-01-02 15:04:05")
                fileins = append(fileins, upfile)
            }
        }
        //fmt.Println(fileins[0].Name)
        //倒序排序
        sort.Sort(fileins)
        ctx.ViewData("FlagAllowDel", FlagAllowDel)
        ctx.ViewData("Files", fileins)
        // 渲染视图文件: ./v/index.html
        ctx.View("share.html")

    })
    //主页管理，与主页共用模板 .v/share.html
    app.Get("/admin/{path:alphabetical}", func(ctx iris.Context) {
        FlagAllowDel := true //允许删除文件标志
        //列出目录下的文件
        var upfile Upfile
        fileins := make(Updir, 0)
        myfolder := "./share" + ctx.Path()[6:] + "/"
        files, _ := ioutil.ReadDir(myfolder)
        for _, file := range files {
            if file.IsDir() {
                continue
            } else {
                upfile.Name = file.Name()
                upfile.Url = ctx.Path() + "/" + file.Name()
                upfile.Date = file.ModTime().Format("2006-01-02 15:04:05")
                fileins = append(fileins, upfile)
            }
        }
        //fmt.Println(fileins[0].Name)
        //倒序排序
        sort.Sort(fileins)
        ctx.ViewData("FlagAllowDel", FlagAllowDel)
        ctx.ViewData("Files", fileins)
        // 渲染视图文件: ./v/index.html
        ctx.View("share.html")

    })
    //上传, 接收用XMLHttpRequest上传的文件
    app.Post("/share/{path:alphabetical}", func(ctx iris.Context) {
        //获取文件内容
        file, head, err := ctx.FormFile("upfile")
        //可参考Get时的路径判断pathwww是否存在，这里省略了...
        myfolder := "." + ctx.Path() + "/"
        defer file.Close()
        //创建文件
        fW, err := os.Create(myfolder + head.Filename)

        if err != nil {
            fmt.Println("文件创建失败")
            return
        }
        defer fW.Close()
        _, err = io.Copy(fW, file)
        if err != nil {
            fmt.Println("文件保存失败")
            return
        }
        ctx.JSON(iris.Map{"success": true, "res": head.Filename})

    })
    //下载,未使用
    app.Get("/share/down", func(ctx iris.Context) {
        //无效ctx.Header("Content-Disposition", "attachment;filename=FileName.txt")
        ctx.ServeFile("./share/1.txt", false)
    })
    //删除
    app.Post("/admin/{dir}", func(ctx iris.Context) {
        path := ctx.PostValue("path") //如 /admin/aaa/111.txt
        myfolder := "./share" + path[6:]
        fmt.Println(myfolder)
        os.Remove(myfolder)
        ctx.JSON(iris.Map{"success": true, "res": "aaaaaaaaaaaa"})

    })    

    app.Run(iris.Addr(":8080"))
}

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>{{.Title}}</title>
<style>
           .file_upload_box {
               display: inline-block;
               width: 200px;
               height: 50px;
               position: relative;
               overflow: hidden;
           }
           .file_upload_box input[type=file] {
               position: absolute;
               left: 0;
               top: 0;
               width: 100%;
               line-height: 50px;
               opacity: 0;
               cursor: pointer;
           }
           .file_upload_box a {
               display: inline-block;
               width: 100%;
               line-height: 50px;
               text-align: center;
               font-family: "Microsoft yahei";
               background-color: #f60;
               color: #FFF;
               font-weight: 700;
               text-decoration: none;
           }    
.flexcontainer{
display:flex;
}           
         </style>
    
</head>
<body>
    <div class="flexcontainer"> 
    {{if $.FlagAllowDel}}
    <span>管理面板</span>
    {{else}}
    <div id="fileSpan" style="background-color:#FFE;width:100%;height:50px">请将文件拖到这里上传(覆盖同名文件)</div>
     <div class="file_upload_box">
             <input type="file" name="file" onchange="upload(this)"/>
             <a href="#none">上传文件</a>
      </div>
    {{end}}    
    
    </div>     
    <script type="text/javascript">    
window.onload = function(){  
     var uuz = document.getElementById(‘fileSpan‘);  

     uuz.ondragenter = function(e){  
         e.preventDefault();  
     }  

     uuz.ondragover = function(e){  
         e.preventDefault();  
         this.innerHTML = ‘请松开鼠标‘;  
         this.style.cssText="background-color:#EFF;width:100%;height:50px;"
    }  

     uuz.ondragleave = function(e){  
         e.preventDefault();  
         this.innerHTML = ‘请将文件拖到这里上传‘;  
         this.style.cssText="background-color:#FFE;width:100%;height:50px;"
     }  

     uuz.ondrop = function(e){  
         e.preventDefault();  
         this.innerHTML = ‘请将文件拖到这里上传‘;  

         var upfile = e.dataTransfer.files[0]; //获取要上传的文件对象(可以上传多个) 
//    alert(upfile.name)
//alert(upfile.type)        
         var formdata = new FormData();  
         var xhr = new XMLHttpRequest();  
         formdata.append(‘upfile‘, upfile); //设置服务器端接收的name为upfile  
         xhr.open("post","");
         xhr.onreadystatechange = function(){ 
             if(this.readyState==4){
                 if(this.status==200){ //上传成功  
                     var resultText = this.responseText;
                     console.info(resultText);
                     //转json
                     var jsonObj = JSON.parse(resultText);
                     console.info(jsonObj);
                     if(jsonObj.success){
                            //var oUl = document.getElementById(‘ul1‘);
                            //var oLi = document.createElement(‘li‘);
                            //var oSpan = document.createElement(‘span‘);
                            //oSpan.innerHTML = jsonObj.res +"&nbsp;&nbsp;&nbsp;刚才上传";
                            //oLi.appendChild(oSpan);
                            //oUl.insertBefore(oLi, oUl.children[0]);
                            //刷新
                            window.location.reload();                     }
                 }else{  
                     alert(‘上传失败,请使用另一种方式上传‘);  
                 }
             }
         }  

         xhr.send(formdata);  
     }       
 }
 function upload(e){
   var upfile = e.files[0];
     var formdata = new FormData();  
         var xhr = new XMLHttpRequest();  
         formdata.append(‘upfile‘, upfile); //设置服务器端接收的name为upfile  
         xhr.open("post","");
         xhr.onreadystatechange = function(){ 
             if(this.readyState==4){
                 if(this.status==200){ //上传成功  
                     var resultText = this.responseText;                    
                     //转json
                     var jsonObj = JSON.parse(resultText);
                     console.info(jsonObj);
                     if(jsonObj.success){                            
                            //刷新
                            window.location.reload();                     }
                 }
             }
         } 
         xhr.send(formdata);  
 }  
    </script>
<div><a href="/share">返回总目录</a>&nbsp;&nbsp;－&nbsp;&nbsp;本目录文件</div>
<ul id="ul1" >

{{range  $i, $v := .Files}}    
    <li style="line-height:200%">
    <span>&nbsp;{{$v.Name}}&nbsp;&nbsp;&nbsp;</span>    
    <span>&nbsp;{{$v.Date}}&nbsp;&nbsp;&nbsp;</span>    
    {{if $.FlagAllowDel}}
    <span>&nbsp;<a href=‘#‘ onclick="del({{$v.Url}})" >删除</a>&nbsp;&nbsp;&nbsp;</span>
    {{else}}
    <span>&nbsp;<a href={{$v.Url}} download={{$v.Name}}>下载</a>&nbsp;&nbsp;&nbsp;</span>
    {{end}}    
    </li>    
{{end}}
</ul>
<script type="text/javascript">
     function del(path){
        //alert(path);
         var formdata = new FormData();  
         var xhr = new XMLHttpRequest();  
         formdata.append(‘path‘, path); //设置服务器端接收 
         xhr.open("post","");
         xhr.onreadystatechange = function(){ 
             if(this.readyState==4){
                 if(this.status==200){ //成功                      
                window.location.reload(); 
                }
                 }else{  
                     //alert(‘删除失败‘);  
                 }
             }
         xhr.send(formdata);  
         }   
</script>
</body>
</html>