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b41925cee3
The CORS code has been unmaintained for long time, and the behavior is not correct. This PR tries to improve it. The key point is written as comment in code. And add more tests. Fix #28515 Fix #27642 Fix #17098
119 lines
3.5 KiB
Go
119 lines
3.5 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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// FileHandlerFunc implements the static handler for serving files in "public" assets
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func FileHandlerFunc() http.HandlerFunc {
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assetFS := AssetFS()
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return func(resp http.ResponseWriter, req *http.Request) {
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if req.Method != "GET" && req.Method != "HEAD" {
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resp.WriteHeader(http.StatusMethodNotAllowed)
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return
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}
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handleRequest(resp, req, assetFS, req.URL.Path)
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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) {
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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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w.WriteHeader(http.StatusNotFound)
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return
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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
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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
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}
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// need to serve index file? (no at the moment)
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if fi.IsDir() {
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w.WriteHeader(http.StatusNotFound)
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return
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}
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serveContent(w, req, fi, fi.ModTime(), f)
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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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