/*
Serve is a very simple static file server in go
Usage:
-p="8100": port to serve on
-d=".": the directory of static files to host
Navigating to http://localhost:8100 will display the index.html or directory
listing file.
*/
package main
import (
"bytes"
"errors"
"fmt"
"io"
"local/args"
"local/gziphttp"
"log"
"net/http"
"net/http/httptest"
"os"
"path"
"regexp"
"strings"
)
const (
ENDPOINT_UPLOAD = "__upload__"
ENDPOINT_DELETE = "__delete__"
)
var (
fs *args.ArgSet
)
func main() {
fs = args.NewArgSet()
fs.Append(args.STRING, "p", "port to serve", "8100")
fs.Append(args.STRING, "d", "static path to serve", "./public")
if err := fs.Parse(); err != nil {
panic(err)
}
d := fs.Get("d").GetString()
p := strings.TrimPrefix(fs.Get("p").GetString(), ":")
http.Handle("/", http.HandlerFunc(handler(d)))
log.Printf("Serving %s on HTTP port: %s\n", d, p)
log.Fatal(http.ListenAndServe(":"+p, nil))
}
func handler(d string) http.HandlerFunc {
return gzip(endpoints(withDel(fserve(d))))
}
func writeMeta(w http.ResponseWriter) {
fmt.Fprintf(w, `
`)
}
func writeForm(w http.ResponseWriter) {
fmt.Fprintf(w, `
`, ENDPOINT_UPLOAD)
}
func gzip(foo http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if gziphttp.Can(r) {
gz := gziphttp.New(w)
defer gz.Close()
w = gz
}
foo(w, r)
}
}
func endpoints(foo http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if isDir(r) {
writeMeta(w)
writeForm(w)
}
if isUploaded(r) {
if err := upload(w, r); err != nil {
fmt.Fprintln(w, err.Error())
}
} else if isDeleted(r) {
if err := del(w, r); err != nil {
fmt.Fprintln(w, err.Error())
}
} else {
setContentTypeIfMedia(w, r)
foo(w, r)
}
}
}
func isUploaded(r *http.Request) bool {
return path.Base(r.URL.Path) == ENDPOINT_UPLOAD
}
func isDeleted(r *http.Request) bool {
return path.Base(r.URL.Path) == ENDPOINT_DELETE
}
func isDir(r *http.Request) bool {
d := toRealPath(r.URL.Path)
fi, err := os.Stat(d)
if err != nil {
return false
}
if !fi.IsDir() {
return false
}
if _, err := os.Stat(path.Join(d, "index.html")); err == nil {
return false
}
return true
}
func withDel(foo http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if !isDir(r) {
foo(w, r)
return
}
fmt.Fprintln(w, ``+"\n")
w2 := httptest.NewRecorder()
foo(w2, r)
b := bytes.Split(w2.Body.Bytes(), []byte("\n"))
buff := bytes.NewBuffer(nil)
for i := range b {
if bytes.Contains(b[i], []byte(" 0 {
match = bytes.Split(match, []byte(`href="`))[1]
match = match[:len(match)-1]
b[i] = []byte(fmt.Sprintf(` %s`, match, ENDPOINT_DELETE, match, b[i]))
}
}
buff.Write(b[i])
buff.Write([]byte("\n"))
}
io.Copy(w, buff)
}
}
func fserve(d string) http.HandlerFunc {
h := http.FileServer(http.Dir(d))
return h.ServeHTTP
}
func upload(w http.ResponseWriter, r *http.Request) error {
r.ParseMultipartForm(100 << 20)
file, handler, err := r.FormFile("file")
if err != nil {
return err
}
defer file.Close()
p := toRealPath(path.Join(path.Dir(r.URL.Path), handler.Filename))
if fi, err := os.Stat(p); err == nil && !fi.IsDir() {
return errors.New("already exists")
}
f, err := os.Create(p)
if err != nil {
return err
}
defer f.Close()
if _, err := io.Copy(f, file); err != nil {
return err
}
http.Redirect(w, r, path.Dir(r.URL.Path)+"/", http.StatusSeeOther)
return nil
}
func del(w http.ResponseWriter, r *http.Request) error {
p := toRealPath(path.Dir(r.URL.Path))
_, err := os.Stat(p)
if err != nil {
return err
}
err = os.RemoveAll(p)
if err != nil {
return err
}
http.Redirect(w, r, path.Dir(path.Dir(r.URL.Path))+"/", http.StatusSeeOther)
return nil
}
func toRealPath(p string) string {
d := path.Join(fs.Get("d").GetString())
return path.Join(d, p)
}
func setContentTypeIfMedia(w http.ResponseWriter, r *http.Request) {
ext := strings.ToLower(path.Ext(r.URL.Path))
if i := strings.LastIndex(ext, "."); i != -1 {
ext = ext[i:]
}
k := "Content-Type"
v := ""
switch ext {
case ".mp4":
v = "video/mp4"
case ".mkv":
v = "video/x-matroska"
case ".mp3":
v = "audio/mpeg3"
case ".epub", ".mobi":
k = "Content-Disposition"
v = "attachment"
case ".jpg", ".jpeg":
v = "image/jpeg"
case ".gif":
v = "image/gif"
case ".png":
v = "image/png"
case ".ico":
v = "image/x-icon"
case ".svg":
v = "image/svg+xml"
case ".css":
v = "text/css"
case ".js":
v = "text/javascript"
case ".json":
v = "application/json"
case ".html", ".htm":
v = "text/html"
case ".pdf":
w.Header().Set("Content-Disposition", fmt.Sprintf("inline; filename=%q", path.Base(r.URL.Path)))
v = "application/pdf"
case ".webm":
v = "video/webm"
case ".weba":
v = "audio/webm"
case ".webp":
v = "image/webp"
case ".zip":
v = "application/zip"
case ".7z":
v = "application/x-7z-compressed"
case ".tar":
v = "application/x-tar"
default:
return
}
w.Header().Set(k, v)
}