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package staticpages
import (
"net/http"
"os"
"path/filepath"
"strings"
"time"
"gitlab.com/gitlab-org/labkit/log"
"gitlab.com/gitlab-org/labkit/mask"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/helper"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/urlprefix"
)
type CacheMode int
const (
CacheDisabled CacheMode = iota
CacheExpireMax
)
// BUG/QUIRK: If a client requests 'foo%2Fbar' and 'foo/bar' exists,
// handleServeFile will serve foo/bar instead of passing the request
// upstream.
func (s *Static) ServeExisting(prefix urlprefix.Prefix, cache CacheMode, notFoundHandler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
file := filepath.Join(s.DocumentRoot, prefix.Strip(r.URL.Path))
// The filepath.Join does Clean traversing directories up
if !strings.HasPrefix(file, s.DocumentRoot) {
helper.Fail500(w, r, &os.PathError{
Op: "open",
Path: file,
Err: os.ErrInvalid,
})
return
}
var content *os.File
var fi os.FileInfo
var err error
// Serve pre-gzipped assets
if acceptEncoding := r.Header.Get("Accept-Encoding"); strings.Contains(acceptEncoding, "gzip") {
content, fi, err = helper.OpenFile(file + ".gz")
if err == nil {
w.Header().Set("Content-Encoding", "gzip")
}
}
// If not found, open the original file
if content == nil || err != nil {
content, fi, err = helper.OpenFile(file)
}
if err != nil {
if notFoundHandler != nil {
notFoundHandler.ServeHTTP(w, r)
} else {
http.NotFound(w, r)
}
return
}
defer content.Close()
switch cache {
case CacheExpireMax:
// Cache statically served files for 1 year
cacheUntil := time.Now().AddDate(1, 0, 0).Format(http.TimeFormat)
w.Header().Set("Cache-Control", "public")
w.Header().Set("Expires", cacheUntil)
}
log.WithContextFields(r.Context(), log.Fields{
"file": file,
"encoding": w.Header().Get("Content-Encoding"),
"method": r.Method,
"uri": mask.URL(r.RequestURI),
}).Info("Send static file")
http.ServeContent(w, r, filepath.Base(file), fi.ModTime(), content)
})
}
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