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// Copyright 2016 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package public
import (
"bytes"
"io"
"net/http"
"os"
"path"
"strings"
"time"
"code.gitea.io/gitea/modules/assetfs"
"code.gitea.io/gitea/modules/container"
"code.gitea.io/gitea/modules/httpcache"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"
)
func CustomAssets() *assetfs.Layer {
return assetfs.Local("custom", setting.CustomPath, "public")
}
func AssetFS() *assetfs.LayeredFS {
return assetfs.Layered(CustomAssets(), BuiltinAssets())
}
// AssetsHandlerFunc implements the static handler for serving custom or original assets.
func AssetsHandlerFunc(prefix string) http.HandlerFunc {
assetFS := AssetFS()
prefix = strings.TrimSuffix(prefix, "/") + "/"
return func(resp http.ResponseWriter, req *http.Request) {
subPath := req.URL.Path
if !strings.HasPrefix(subPath, prefix) {
return
}
subPath = strings.TrimPrefix(subPath, prefix)
if req.Method != "GET" && req.Method != "HEAD" {
resp.WriteHeader(http.StatusNotFound)
return
}
if handleRequest(resp, req, assetFS, subPath) {
return
}
resp.WriteHeader(http.StatusNotFound)
}
}
// parseAcceptEncoding parse Accept-Encoding: deflate, gzip;q=1.0, *;q=0.5 as compress methods
func parseAcceptEncoding(val string) container.Set[string] {
parts := strings.Split(val, ";")
types := make(container.Set[string])
for _, v := range strings.Split(parts[0], ",") {
types.Add(strings.TrimSpace(v))
}
return types
}
// setWellKnownContentType will set the Content-Type if the file is a well-known type.
// See the comments of detectWellKnownMimeType
func setWellKnownContentType(w http.ResponseWriter, file string) {
mimeType := detectWellKnownMimeType(path.Ext(file))
if mimeType != "" {
w.Header().Set("Content-Type", mimeType)
}
}
func handleRequest(w http.ResponseWriter, req *http.Request, fs http.FileSystem, file string) bool {
// actually, fs (http.FileSystem) is designed to be a safe interface, relative paths won't bypass its parent directory, it's also fine to do a clean here
f, err := fs.Open(util.PathJoinRelX(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
}
type GzipBytesProvider interface {
GzipBytes() []byte
}
// serveContent serve http content
func serveContent(w http.ResponseWriter, req *http.Request, fi os.FileInfo, modtime time.Time, content io.ReadSeeker) {
setWellKnownContentType(w, fi.Name())
encodings := parseAcceptEncoding(req.Header.Get("Accept-Encoding"))
if encodings.Contains("gzip") {
// try to provide gzip content directly from bindata (provided by vfsgen۰CompressedFileInfo)
if compressed, ok := fi.(GzipBytesProvider); ok {
rdGzip := bytes.NewReader(compressed.GzipBytes())
// all gzipped static files (from bindata) are managed by Gitea, so we can make sure every file has the correct ext name
// then we can get the correct Content-Type, we do not need to do http.DetectContentType on the decompressed data
if w.Header().Get("Content-Type") == "" {
w.Header().Set("Content-Type", "application/octet-stream")
}
w.Header().Set("Content-Encoding", "gzip")
http.ServeContent(w, req, fi.Name(), modtime, rdGzip)
return
}
}
http.ServeContent(w, req, fi.Name(), modtime, content)
return
}
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