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fileserver.go
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package gohttp
import (
"errors"
"fmt"
"html/template"
"io"
"log"
"mime"
"net"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"strings"
"time"
"github.com/itang/gotang"
)
const htmlTpl = `
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>{{.CurrentPath}} - gohttp</title></head>
<link href="http://cdn.staticfile.org/twitter-bootstrap/2.3.2/css/bootstrap.min.css" rel="stylesheet">
<link href="http://cdn.staticfile.org/twitter-bootstrap/2.3.2/css/bootstrap-responsive.min.css" rel="stylesheet">
<body>
<div class="container-fluid">
<ul class="breadcrumb">
<li><a href="http://github.com/itang/gohttp">GOHTTP</a><span class="divider"> | </span></li>
<li><a href="#"><a href="/{{.ParentURI}}">{{.ParentPath}}</a><span class="divider"> | </span></li>
<li class="active"><a href="/{{.CurrentURI}}">{{.CurrentPath}}</a></li>
</ul>
<ul>
{{range .files}}
<li><a href="/{{.URI}}">{{.Name}}
{{if .Size }}
<small>({{.Size}})</small>
{{end}}
</a></li>
{{end}}</ul>
</div></body></html>`
var tmp = template.Must(template.New("index").Parse(htmlTpl))
type FileServer struct {
Port int
Webroot string
}
type Item struct {
Name string
Title string
URI string
Size int64
}
func lookupWlanIP4addr() (ip4 string, err error) {
addrs, err := net.InterfaceAddrs()
if err != nil {
return
}
for _, addr := range addrs {
if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
if ipnet.IP.To4() != nil {
return ipnet.IP.String(), nil
}
}
}
return "", errors.New("No Found")
}
func tryGetLocalAddr() (ip string, err error) {
conn, err := net.DialTimeout("udp", "google.com:80", time.Millisecond*500)
if err != nil {
log.Println(err.Error())
return
}
defer conn.Close()
return strings.Split(conn.LocalAddr().String(), ":")[0], nil
}
func wlanIP4() string {
wip, err := tryGetLocalAddr()
if err != nil {
wip, err = lookupWlanIP4addr()
}
if err != nil {
wip = "Unknown"
}
return wip
}
func (fileServer *FileServer) Start() {
fileServer.router()
fmt.Printf("Serving HTTP on %s port %d from \"%s\" ... \n",
wlanIP4(), fileServer.Port, fileServer.Webroot,
)
addr := fmt.Sprintf(":%v", fileServer.Port)
log.Fatal(http.ListenAndServe(addr, nil))
}
func (fileServer *FileServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
defer func() {
if err := recover(); err != nil {
http.Error(w, fmt.Sprintf("%v", err), http.StatusInternalServerError)
}
}()
fileServer.handler(w, req)
}
func (fileServer *FileServer) router() {
http.Handle("/", fileServer)
}
var (
s1 = strings.Repeat(". ", (len("2013/11/19 21:16:13")+4)/2)
s2 = strings.Repeat("*", len("2013/11/19 21:16:13"))
)
func (fileServer *FileServer) handler(w http.ResponseWriter, req *http.Request) {
uri := req.RequestURI // 请求的URI, 如http://localhost:8080/hello -> /hello
if uri == "/favicon.ico" { // 不处理
return
}
traceInfo := fmt.Sprintf("%s \"%s\" from %v\n", req.Method, req.RequestURI, req.RemoteAddr)
fullpath, relpath := fileServer.requestURIToFilepath(uri)
traceInfo += fmt.Sprintf("%sTo Filepath: %v\n", s1, fullpath)
file, err := os.Open(fullpath)
if err != nil || os.IsNotExist(err) { // 文件不存在
traceInfo += s1 + "NotFound!\n"
http.NotFound(w, req)
} else {
stat, _ := file.Stat()
if stat.IsDir() {
traceInfo += s1 + "Process Dir...\n"
fileServer.processDir(w, file, fullpath, relpath)
} else {
traceInfo += s1 + "Send File...\n"
fileServer.sendFile(w, file, fullpath, relpath)
}
}
log.Println(traceInfo + s2 + " END")
}
func (fileServer *FileServer) requestURIToFilepath(uri string) (fullpath string, relpath string) {
unescapeIt, _ := url.QueryUnescape(uri)
relpath = unescapeIt
fullpath = filepath.Join(fileServer.Webroot, relpath[1:])
return
}
func (_ *FileServer) processDir(w http.ResponseWriter, dir *os.File, fullpath string, relpath string) {
w.Header().Set("Content-type", "text/html; charset=UTF-8")
fis, err := dir.Readdir(-1)
gotang.AssertNoError(err, "读取文件夹信息出错！")
items := make([]Item, 0, len(fis))
for _, fi := range fis {
var size int64
if !fi.IsDir() {
size = fi.Size()
}
item := Item{
Name: fi.Name(),
Title: fi.Name(),
URI: url.PathEscape(path.Join(relpath, fi.Name())),
Size: size,
}
items = append(items, item)
}
parentPath, currentPath := path.Dir(relpath), relpath
tmp.Execute(w, map[string]interface{}{
"ParentPath": parentPath,
"CurrentPath": currentPath,
"ParentURI": url.PathEscape(parentPath),
"CurrentURI": url.PathEscape(currentPath),
"files": items,
})
}
func (_ *FileServer) sendFile(w http.ResponseWriter, file *os.File, fullpath string, relpath string) {
if mimetype := mime.TypeByExtension(path.Ext(file.Name())); mimetype != "" {
w.Header().Set("Content-Type", mimetype)
} else {
w.Header().Set("Content-Type", "application/octet-stream")
}
statinfo, _ := file.Stat()
w.Header().Set("Content-Length", fmt.Sprintf("%v", statinfo.Size()))
io.Copy(w, file)
}