/
fileproxy.go
359 lines (294 loc) · 8.13 KB
/
fileproxy.go
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package main
import (
"bytes"
"flag"
"github.com/dchest/uniuri"
"github.com/hoisie/web"
"html/template"
"io"
"io/ioutil"
"log"
"net/http"
"strconv"
"time"
)
var WAIT_CLIENT_TIMEOUT = 60 * time.Minute
type AppConfig struct {
Scheme string
Host string
BindScheme string
BindHost string
UseXForwardedFor bool
}
var appConfig AppConfig
type uploadRequest struct {
request *http.Request
wait chan string
}
var uploadRequests = make(map[string]uploadRequest)
type IndexTemplateValue struct {
AppConfig
Key string
}
var indexTemplate = `<html>
<head>
<title>ファイル転送くん</title>
<link href="/css/bootstrap.min.css" rel="stylesheet">
<style>
body {
padding-top: 20px;
}
</style>
</head>
<body>
<div class="container text-center">
<div class="hero-unit">
<h1>ファイル転送くん</h1>
<br />
<ol>
<li>ファイルを選んで「転送開始」を押す。</li>
<li>出てきた URL を相手に教えて、開いてもらう。</li>
<li>転送が始まるので、気長に待つ。</li>
</ol>
</div>
<p id="download-url">この URL を相手に開いてもらってね。 <b>{{.Scheme}}://{{.Host}}/download/{{.Key}}<b></p>
<form id="upload-form" action="./upload/{{.Key}}" method="POST" enctype="multipart/form-data">
<input type="hidden" name="size" value="-1" />
ファイル: <input type="file" name="file" />
<input id="upload-btn" class="btn" type="submit" value="転送開始" />
</form>
<div id="progress-info" class="alert alert-info" style="display: none;">
<p id="progress-msg">
相手接続待ち…
</p>
<div id="progress-container" class="progress progress-striped active">
<div id="progress-bar" class="bar" style="width: 0%"></div>
</div>
</div>
</div>
<script src="/js/jquery.min.js"></script>
<script src="/js/bootstrap.min.js"></script>
<script>
$(document).ready(function() {
$('#download-url').hide();
$('#upload-form').on('submit', function(event) {
var form = event.target;
if (!form.file.value) {
return false;
}
if (form.file.files[0].size) {
form.size.value = form.file.files[0].size;
}
// some broken browsers don't support FormData
if (!FormData) {
$('#download-url').show();
return true;
}
var data = new FormData(form);
var xhr = $.ajax({
url: form.action,
type: 'POST',
xhr: function() {
var req = $.ajaxSettings.xhr();
if (req) {
req.upload.addEventListener('progress', function(event) {
// because some bytes may be bufferd on client/server,
// ignore < 2M bytes
console.log(event.loaded);
if (event.loaded > 2 * 1024 * 1024) {
$('#progress-msg').text('転送中…');
}
if (event.lengthComputable) {
var percentage = event.loaded / event.total * 100;
$('#progress-bar')[0].style.width = percentage + '%';
}
}, false);
}
return req;
},
beforeSend: function(xhr) {
$('#download-url').show();
$('#progress-info').show();
},
success: function(result, status) {
$('#progress-msg').text('転送完了');
$('#progress-bar')[0].style.width = '100%';
},
error: function(xhr, status) {
$('#progress-msg').text('転送失敗');
},
complete: function() {
$('#progress-container').removeClass('active');
},
data: data,
cache: false,
contentType: false,
processData: false
});
return false;
});
});
</script>
</body>
</html>
`
type UploadTemplateValue struct {
Message string
}
var uploadTemplate = `<html>
<head>
<title>ファイル転送くん</title>
<link href="/css/bootstrap.min.css" rel="stylesheet">
<style>
body {
padding-top: 20px;
}
</style>
</head>
<body>
<div class="container text-center">
<div class="hero-unit">
<h1>ファイル転送くん</h1>
<br />
<ol>
<li>ファイルを選んで「転送開始」を押す。</li>
<li>出てきた URL を相手に教えて、開いてもらう。</li>
<li>転送が始まるので、気長に待つ。</li>
</ol>
</div>
<p>{{.Message}}</p>
<p><a href="/">戻る</a></p>
</body>
</html>
`
func indexPage(ctx *web.Context) {
updateRemoteAddr(ctx)
tmpl, err := template.New("index").Parse(indexTemplate)
if err != nil {
panic(err)
}
key := uniuri.New()
v := IndexTemplateValue{appConfig, key}
if ctx.Request.Host != "" {
v.Host = ctx.Request.Host
}
if v.Scheme == "" {
v.Scheme = appConfig.BindScheme
}
tmpl.Execute(ctx, v)
}
func uploader(ctx *web.Context, key string) {
updateRemoteAddr(ctx)
if _, ok := uploadRequests[key]; ok {
// key exists
ctx.Forbidden()
return
}
wait := make(chan string)
defer delete(uploadRequests, key)
uploadRequests[key] = uploadRequest{ctx.Request, wait}
var result string
select {
case result = <-wait:
case <-time.After(WAIT_CLIENT_TIMEOUT):
result = "wait client timeout"
}
if result == "connected" {
// wait actual result
result = <-wait
}
var body string
if xrw := ctx.Request.Header.Get("X-Requested-With"); xrw == "XMLHttpRequest" {
body = "{\"result\": \"" + result + "\"}\n"
ctx.SetHeader("Content-Type", "application/json", true)
} else {
tmpl, err := template.New("uploader").Parse(uploadTemplate)
if err != nil {
panic(err)
}
var buf bytes.Buffer
tmpl.Execute(&buf, UploadTemplateValue{result})
body = buf.String()
}
if result == "ok" {
ctx.WriteString(body)
} else {
ctx.Abort(500, body)
ctx.Request.Body.Close()
}
}
func downloader(ctx *web.Context, key string) {
updateRemoteAddr(ctx)
up, ok := uploadRequests[key]
if !ok {
ctx.NotFound("key doesn't exist")
return
}
up.wait <- "connected"
result := "ng"
defer func() { up.wait <- result }()
mr, err := up.request.MultipartReader()
if err != nil {
ctx.Abort(500, err.Error())
return
}
p, err := mr.NextPart()
if p.FormName() == "size" {
fileSize, err := ioutil.ReadAll(p)
if err == nil {
fileSize, err := strconv.ParseInt(string(fileSize), 10, 64)
if err == nil && fileSize >= 0 {
ctx.SetHeader("Content-Length", strconv.FormatInt(fileSize, 10), true)
}
}
}
p, err = mr.NextPart()
if err != nil {
ctx.Abort(500, err.Error())
return
}
if p.FormName() != "file" {
ctx.Abort(500, "invalid POST (upload) request")
return
}
if contentType := p.Header.Get("Content-Type"); contentType != "" {
ctx.SetHeader("Content-Type", contentType, true)
}
ctx.SetHeader("Content-Disposition", "attachment; filename="+p.FileName(), true)
_, err = io.Copy(ctx, p)
if err == nil {
result = "ok"
} else {
// XXX: may expose too many infomation (such as client IP address)
//result = err.Error()
}
}
func updateRemoteAddr(ctx *web.Context) {
if appConfig.UseXForwardedFor {
if xff := ctx.Request.Header.Get("X-Forwarded-For"); xff != "" {
ctx.Request.RemoteAddr = xff
}
}
}
func main() {
web.Get("/", indexPage)
web.Post("/upload/(.*)", uploader)
web.Get("/download/(.*)", downloader)
bindHost := flag.String("bind", "0.0.0.0:8000", "bind to this address:port")
realHost := flag.String("real-host", "", "real hostname client use to connect")
realScheme := flag.String("real-scheme", "", "real scheme client use to connect")
useXForwardedFor := flag.Bool("use-x-forwarded-for", false, "use X-Forwarded-For header for logging")
logfile := flag.String("logfile", "", "log file (defaulg: stderr)")
flag.Parse()
appConfig = AppConfig{
*realScheme,
*realHost,
"http",
*bindHost,
*useXForwardedFor,
}
if *logfile != "" {
web.SetLogger(NewRotateLog(*logfile, 1024*1024, 10, "", log.Ldate|log.Ltime))
}
web.Run(appConfig.BindHost)
}