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web.go
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package main
import (
"github.com/valyala/fasthttp"
"log"
"os"
"strings"
"bytes"
"io/ioutil"
"strconv"
"time"
"fmt"
"os/exec"
"runtime"
"flag"
)
//从url中获取文件名
func getFileName(url string) string {
fileNames := strings.Split(url, "/")
fileName := fileNames[len(fileNames) - 1]
if fileName == "" {
fileName = "noname"
}
fileName = strings.Replace(fileName, "?", "_", -1)
fileName = strings.Replace(fileName, "#", "_", -1)
fileName = strings.Replace(fileName, "&", "_", -1)
return fileName
}
//使用fasthttp下载文件
func download(url string) bool {
fileName := getFileName(url)
out, _ := os.Create("./download/" + fileName)
defer out.Close()
statusCode, body, err := fasthttp.Get(nil, url)
if statusCode == 200 && err == nil {
out.Write(body)
}
return true
}
//调用wget下载文件
func downloadByWget(url string) bool {
fileName := getFileName(url)
cmd := exec.Command("wget", "-c", "-O", "./download/" + fileName, url)
err := cmd.Start()
if err != nil {
log.Fatal(err)
}
err = cmd.Wait()
log.Printf("Command finished with error: %v", err)
return true
}
func main() {
host := flag.String("host", "0.0.0.0", "host")
port := flag.String("port", "8081", "port")
flag.Parse()
m := func(ctx *fasthttp.RequestCtx) {
switch {
case string(ctx.Path()) == "/":
ctx.SetContentType("text/html; charset=utf-8")
ctx.WriteString(`<!doctype html>
<html class="no-js">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="description" content="">
<meta name="keywords" content="">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<title>离线下载</title>
<meta name="renderer" content="webkit">
<meta http-equiv="Cache-Control" content="no-siteapp"/>
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-title" content="Amaze UI"/>
<meta name="msapplication-TileColor" content="#0e90d2">
<link rel="stylesheet" href="//cdn.amazeui.org/amazeui/2.4.2/css/amazeui.min.css">
</head>
<body>
<header class="am-topbar am-topbar-inverse">
<div class="am-container am-cf">
<div class="am-g">
<h1 class="am-topbar-brand">
<a href="#">离线下载</a>
</h1>
<!-- topbar-right -->
<div class="am-topbar-right">
<button class="am-btn am-btn-primary am-topbar-btn am-btn-sm">基于golang的下载神器</button>
</div>
</div>
</div>
</header>
<div class="am-container">
<div class="am-g">
<div class="am-u-md-10 am-u-sm-centered">
<legend>离线下载</legend>
<div class="am-form-group">
<p>欢迎使用！采用golang后台下载的方法实现简单的离线下载功能</p>
<p>文件永久保留，下载空间为512M，若空间不足，请手工删除，且用且珍惜！</p>
<div class="am-input-group">
<span class="am-input-group-label">
<i class="am-icon-cloud-download"></i>
</span>
<input type="text" id="download" class="am-form-field" placeholder="请把文件的下载地址粘贴到这里,然后点击Enter即可。" />
</div>
</div>
<button type="submit" class="am-btn am-btn-primary am-btn-block" onclick="download();">Enter</button>
</div>
</div>
<div class="am-g">
<div class="am-u-md-14 am-u-sm-centered">
<table class="am-table am-table-hover">
<thead>
<tr>
<th>文件列表</th>
</tr>
</thead>
<tbody id="downlist">
</tbody>
</table>
</div>
</div>
<hr>
<!-- 多说评论框 start -->
<div class="ds-thread" data-thread-key="c7ef117e8fb5d1de76d99897dbbdad64" data-title="php离线下载" data-url="http://lyxz.gq/"></div>
<!-- 多说评论框 end -->
<!-- 多说公共JS代码 start (一个网页只需插入一次) -->
<script type="text/javascript">
var duoshuoQuery = {short_name:"lyxzgq"};
(function() {
var ds = document.createElement('script');
ds.type = 'text/javascript';ds.async = true;
ds.src = (document.location.protocol == 'https:' ? 'https:' : 'http:') + '//static.duoshuo.com/embed.js';
ds.charset = 'UTF-8';
(document.getElementsByTagName('head')[0]
|| document.getElementsByTagName('body')[0]).appendChild(ds);
})();
</script>
<!-- 多说公共JS代码 end -->
</div>
<footer ata-am-widget="footer" class="am-footer am-footer-default" style="
background:#555;
font-color:#000;
">
<style>
.am-footer-default a{
color:#999;
}
</style>
<div class="am-footer-miscs">
<p>友情链接 <a href="http://www.lanyus.com/" rel="friend" target="_blank">无心问世</a></p>
<p><a href="https://github.com/ilanyu/offLineDownloader" target="_blank">关于</a></p>
<p class="am-article-meta">
</p><p><a href="#" target="_blank"><span class="am-icon-qq am-success" target="_blank"></span> 程序开发 无心问世</a></p>
<br>
<p>© 2016 无心问世. copyright</p>
</div>
</footer>
<div class="am-modal am-modal-no-btn" tabindex="-1" id="downerror">
<div class="am-modal-dialog">
<div class="am-modal-hd">错误
<a href="javascript: void(0)" class="am-close am-close-spin" data-am-modal-close>×</a>
</div>
<div class="am-modal-bd">
下载出现错误，可能是不允许的文件后缀或下载空间已满。
</div>
</div>
</div>
<!--[if lt IE 9]>
<script src="http://libs.baidu.com/jquery/1.11.1/jquery.min.js"></script>
<script src="//cdn.staticfile.org/modernizr/2.8.3/modernizr.js"></script>
<script src="/js/polyfill/rem.min.js"></script>
<script src="http://libs.baidu.com/respond.js/1.4.2/respond.min.js"></script>
<script src="//cdn.amazeui.org/amazeui/2.4.2/js/amazeui.legacy.min.js"></script>
<![endif]-->
<!--[if (gte IE 9)|!(IE)]><!-->
<script src="http://libs.baidu.com/jquery/2.1.1/jquery.min.js"></script>
<script src="//cdn.amazeui.org/amazeui/2.4.2/js/amazeui.min.js"></script>
<!--<![endif]-->
<script>
function writeDownList() {
$.getJSON('./downlist',null,function (data) {
var downlist = document.getElementById('downlist');
downlist.innerHTML = '<tr><td>#</td><td>名称</td><td>修改时间</td><td>大小</td><td>操作</td></tr>';
for (var i = 0 ; i < data.length ; i++) {
downlist.innerHTML = downlist.innerHTML + '<tr><td>' + i + '</td><td><a href="./download/' + data[i]['name'] + '">' + data[i]['name'] + '</a></td><td>' + data[i]['mtime'] + '</td><td>' + data[i]['size'] + '</td><td><button type="button" class="am-btn" onclick="del(\'' + data[i]['name'] + '\');">删除</button></td></tr>';
}
});
}
function download() {
var url = document.getElementById("download").value;
$.get('./down',{'url':url},function (data) {
if (data == 'success') {
writeDownList();
} else {
$('#downerror').modal();
}
});
}
function del(file) {
$.get('./delete',{'file':file},function (data) {
writeDownList();
});
}
writeDownList();
</script>
</body>
</html>
`)
case string(ctx.Path()) == "/down":
//点击“下载”触发，下载远程文件
args := ctx.QueryArgs()
url := string(args.Peek("url"))
protocol := strings.Split(url, "://")
if protocol[0] != "http" && protocol[0] != "https" && protocol[0] != "ftp" {
ctx.WriteString("failed")
log.Println(protocol)
return
}
//
if runtime.GOOS != "linux" {
go download(url)
} else {
go downloadByWget(url)
}
ctx.WriteString("success")
log.Println("visiter " + ctx.RemoteIP().String() + " use " + string(ctx.UserAgent()) + " downloaded " + url + " in " + time.Now().Format("2006-01-02 15:04:05"))
case string(ctx.Path()) == "/delete":
//删除文件
args := ctx.QueryArgs()
file := string(args.Peek("file"))
file = strings.Replace(file, "/", "", -1)
os.Remove("./download/" + file)
ctx.WriteString("success")
case bytes.HasPrefix(ctx.Path(), []byte("/download/")):
fasthttp.FSHandler("./download", 1)(ctx)
case string(ctx.Path()) == "/downlist":
//生成文件列表
dirList, _ := ioutil.ReadDir("./download")
length := len(dirList)
ctx.WriteString("[")
for i := 0; i < length; i++ {
ctx.WriteString(`{"name":"` + dirList[i].Name() + `","mtime":"` + dirList[i].ModTime().Format("2006-01-02 15:04:05") + `","size":"` + strconv.FormatInt(dirList[i].Size() / 1024 / 1024, 10) + ` MB"}`)
if i != length - 1 {
ctx.WriteString(",")
}
}
ctx.WriteString("]")
default:
ctx.Error("not found", fasthttp.StatusNotFound)
}
}
if fileInfo, err := os.Stat("./download"); err != nil || !fileInfo.IsDir() {
os.Mkdir("./download", 0755)
log.Println("mkDir dirctionary")
}
//bind := fmt.Sprintf("%s:%s", os.Getenv("OPENSHIFT_GO_IP"), os.Getenv("OPENSHIFT_GO_PORT"))
bind := fmt.Sprintf("%s:%s", *host, *port)
log.Printf("run on %s...\n", runtime.GOOS)
log.Printf("listening on %s...\n", bind)
if err := fasthttp.ListenAndServe(bind, m); err != nil {
log.Fatal(err)
}
}