mirror of
https://codeberg.org/forgejo/forgejo
synced 2024-11-25 11:16:11 +01:00
a94a8d0ab1
`http.ServeFile/ServeContent` handles `If-xxx`, `Content-Length`, `Range` and `Etag` correctly After this PR, storage files (eg: avatar) could be responded with correct Content-Length.
100 lines
3.1 KiB
Go
100 lines
3.1 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
package httpcache
|
|
|
|
import (
|
|
"io"
|
|
"net/http"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
|
|
"code.gitea.io/gitea/modules/setting"
|
|
)
|
|
|
|
// SetCacheControlInHeader sets suitable cache-control headers in the response
|
|
func SetCacheControlInHeader(h http.Header, maxAge time.Duration, additionalDirectives ...string) {
|
|
directives := make([]string, 0, 2+len(additionalDirectives))
|
|
|
|
// "max-age=0 + must-revalidate" (aka "no-cache") is preferred instead of "no-store"
|
|
// because browsers may restore some input fields after navigate-back / reload a page.
|
|
if setting.IsProd {
|
|
if maxAge == 0 {
|
|
directives = append(directives, "max-age=0", "private", "must-revalidate")
|
|
} else {
|
|
directives = append(directives, "private", "max-age="+strconv.Itoa(int(maxAge.Seconds())))
|
|
}
|
|
} else {
|
|
directives = append(directives, "max-age=0", "private", "must-revalidate")
|
|
|
|
// to remind users they are using non-prod setting.
|
|
h.Set("X-Gitea-Debug", "RUN_MODE="+setting.RunMode)
|
|
}
|
|
|
|
h.Set("Cache-Control", strings.Join(append(directives, additionalDirectives...), ", "))
|
|
}
|
|
|
|
func ServeContentWithCacheControl(w http.ResponseWriter, req *http.Request, name string, modTime time.Time, content io.ReadSeeker) {
|
|
SetCacheControlInHeader(w.Header(), setting.StaticCacheTime)
|
|
http.ServeContent(w, req, name, modTime, content)
|
|
}
|
|
|
|
// 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
|
|
}
|
|
}
|
|
SetCacheControlInHeader(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
|
|
}
|
|
|
|
// HandleGenericETagTimeCache handles ETag-based caching with Last-Modified caching for a HTTP request.
|
|
// It returns true if the request was handled.
|
|
func HandleGenericETagTimeCache(req *http.Request, w http.ResponseWriter, etag string, lastModified time.Time) (handled bool) {
|
|
if len(etag) > 0 {
|
|
w.Header().Set("Etag", etag)
|
|
}
|
|
if !lastModified.IsZero() {
|
|
w.Header().Set("Last-Modified", lastModified.Format(http.TimeFormat))
|
|
}
|
|
|
|
if len(etag) > 0 {
|
|
if checkIfNoneMatchIsValid(req, etag) {
|
|
w.WriteHeader(http.StatusNotModified)
|
|
return true
|
|
}
|
|
}
|
|
if !lastModified.IsZero() {
|
|
ifModifiedSince := req.Header.Get("If-Modified-Since")
|
|
if ifModifiedSince != "" {
|
|
t, err := time.Parse(http.TimeFormat, ifModifiedSince)
|
|
if err == nil && lastModified.Unix() <= t.Unix() {
|
|
w.WriteHeader(http.StatusNotModified)
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
SetCacheControlInHeader(w.Header(), setting.StaticCacheTime)
|
|
return false
|
|
}
|