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