mirror of
https://github.com/go-gitea/gitea
synced 2024-11-19 00:11:24 +01:00
87 lines
2.7 KiB
Go
87 lines
2.7 KiB
Go
// Copyright 2020 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 httpcache
|
|
|
|
import (
|
|
"encoding/base64"
|
|
"fmt"
|
|
"net/http"
|
|
"os"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
|
|
"code.gitea.io/gitea/modules/setting"
|
|
)
|
|
|
|
// AddCacheControlToHeader adds suitable cache-control headers to response
|
|
func AddCacheControlToHeader(h http.Header, d time.Duration) {
|
|
if setting.IsProd {
|
|
h.Set("Cache-Control", "private, max-age="+strconv.Itoa(int(d.Seconds())))
|
|
} else {
|
|
h.Set("Cache-Control", "no-store")
|
|
// to remind users they are using non-prod setting.
|
|
// some users may be confused by "Cache-Control: no-store" in their setup if they did wrong to `RUN_MODE` in `app.ini`.
|
|
h.Add("X-Gitea-Debug", "RUN_MODE="+setting.RunMode)
|
|
h.Add("X-Gitea-Debug", "CacheControl=no-store")
|
|
}
|
|
}
|
|
|
|
// generateETag generates an ETag based on size, filename and file modification time
|
|
func generateETag(fi os.FileInfo) string {
|
|
etag := fmt.Sprint(fi.Size()) + fi.Name() + fi.ModTime().UTC().Format(http.TimeFormat)
|
|
return `"` + base64.StdEncoding.EncodeToString([]byte(etag)) + `"`
|
|
}
|
|
|
|
// HandleTimeCache handles time-based caching for a HTTP request
|
|
func HandleTimeCache(req *http.Request, w http.ResponseWriter, fi os.FileInfo) (handled bool) {
|
|
AddCacheControlToHeader(w.Header(), setting.StaticCacheTime)
|
|
|
|
ifModifiedSince := req.Header.Get("If-Modified-Since")
|
|
if ifModifiedSince != "" {
|
|
t, err := time.Parse(http.TimeFormat, ifModifiedSince)
|
|
if err == nil && fi.ModTime().Unix() <= t.Unix() {
|
|
w.WriteHeader(http.StatusNotModified)
|
|
return true
|
|
}
|
|
}
|
|
|
|
w.Header().Set("Last-Modified", fi.ModTime().Format(http.TimeFormat))
|
|
return false
|
|
}
|
|
|
|
// HandleFileETagCache handles ETag-based caching for a HTTP request
|
|
func HandleFileETagCache(req *http.Request, w http.ResponseWriter, fi os.FileInfo) (handled bool) {
|
|
etag := generateETag(fi)
|
|
return HandleGenericETagCache(req, w, etag)
|
|
}
|
|
|
|
// HandleGenericETagCache handles ETag-based caching for a HTTP request.
|
|
// It returns true if the request was handled.
|
|
func HandleGenericETagCache(req *http.Request, w http.ResponseWriter, etag string) (handled bool) {
|
|
if len(etag) > 0 {
|
|
w.Header().Set("Etag", etag)
|
|
if checkIfNoneMatchIsValid(req, etag) {
|
|
w.WriteHeader(http.StatusNotModified)
|
|
return true
|
|
}
|
|
}
|
|
AddCacheControlToHeader(w.Header(), setting.StaticCacheTime)
|
|
return false
|
|
}
|
|
|
|
// checkIfNoneMatchIsValid tests if the header If-None-Match matches the ETag
|
|
func checkIfNoneMatchIsValid(req *http.Request, etag string) bool {
|
|
ifNoneMatch := req.Header.Get("If-None-Match")
|
|
if len(ifNoneMatch) > 0 {
|
|
for _, item := range strings.Split(ifNoneMatch, ",") {
|
|
item = strings.TrimSpace(item)
|
|
if item == etag {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
return false
|
|
}
|