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// Copyright 2016 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package public
import (
"net/http"
"os"
"path"
"path/filepath"
"strings"
"code.gitea.io/gitea/modules/httpcache"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
)
// Options represents the available options to configure the handler.
type Options struct {
Directory string
Prefix string
CorsHandler func(http.Handler) http.Handler
}
// AssetsHandler implements the static handler for serving custom or original assets.
func AssetsHandler(opts *Options) func(next http.Handler) http.Handler {
var custPath = filepath.Join(setting.CustomPath, "public")
if !filepath.IsAbs(custPath) {
custPath = filepath.Join(setting.AppWorkPath, custPath)
}
if !filepath.IsAbs(opts.Directory) {
opts.Directory = filepath.Join(setting.AppWorkPath, opts.Directory)
}
if !strings.HasSuffix(opts.Prefix, "/") {
opts.Prefix += "/"
}
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
if !strings.HasPrefix(req.URL.Path, opts.Prefix) {
next.ServeHTTP(resp, req)
return
}
if req.Method != "GET" && req.Method != "HEAD" {
resp.WriteHeader(http.StatusNotFound)
return
}
file := req.URL.Path
file = file[len(opts.Prefix):]
if len(file) == 0 {
resp.WriteHeader(http.StatusNotFound)
return
}
if strings.Contains(file, "\\") {
resp.WriteHeader(http.StatusBadRequest)
return
}
file = "/" + file
var written bool
if opts.CorsHandler != nil {
written = true
opts.CorsHandler(http.HandlerFunc(func(http.ResponseWriter, *http.Request) {
written = false
})).ServeHTTP(resp, req)
}
if written {
return
}
// custom files
if opts.handle(resp, req, http.Dir(custPath), file) {
return
}
// internal files
if opts.handle(resp, req, fileSystem(opts.Directory), file) {
return
}
resp.WriteHeader(http.StatusNotFound)
})
}
}
// parseAcceptEncoding parse Accept-Encoding: deflate, gzip;q=1.0, *;q=0.5 as compress methods
func parseAcceptEncoding(val string) map[string]bool {
parts := strings.Split(val, ";")
var types = make(map[string]bool)
for _, v := range strings.Split(parts[0], ",") {
types[strings.TrimSpace(v)] = true
}
return types
}
func (opts *Options) handle(w http.ResponseWriter, req *http.Request, fs http.FileSystem, file string) bool {
// use clean to keep the file is a valid path with no . or ..
f, err := fs.Open(path.Clean(file))
if err != nil {
if os.IsNotExist(err) {
return false
}
w.WriteHeader(http.StatusInternalServerError)
log.Error("[Static] Open %q failed: %v", file, err)
return true
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
log.Error("[Static] %q exists, but fails to open: %v", file, err)
return true
}
// Try to serve index file
if fi.IsDir() {
w.WriteHeader(http.StatusNotFound)
return true
}
if httpcache.HandleFileETagCache(req, w, fi) {
return true
}
serveContent(w, req, fi, fi.ModTime(), f)
return true
}
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