forgejo/modules/httpcache/httpcache.go
Earl Warren fc9765d573
[BRANDING] add X-Forgejo-* headers
(cherry picked from commit 0a3388f93f)
(cherry picked from commit 7eba0a440a)
(cherry picked from commit eb9646c7ef)
(cherry picked from commit f1972578f5)

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(cherry picked from commit 7f96222fb4)
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(cherry picked from commit 681d3ed5c4)
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(cherry picked from commit aa7adc167d)
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(cherry picked from commit 472c489996)
(cherry picked from commit dc816d065b)
(cherry picked from commit 4795f9ea85)
(cherry picked from commit ddd4ae5343)
(cherry picked from commit 0e95f2a36b)
(cherry picked from commit 47a41a4e7b)
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(cherry picked from commit 62b1de579e)
(cherry picked from commit 507abee353)
(cherry picked from commit 8c36ac42c7)
(cherry picked from commit 72f74067f4)
(cherry picked from commit 8e5a9e187b)
(cherry picked from commit cff8f43c7e)
(cherry picked from commit 13544bbde8)
(cherry picked from commit 5b7a117347)
(cherry picked from commit ab61310f10)
(cherry picked from commit 537c214c28)
(cherry picked from commit 91a6c59c9d)
2023-11-13 13:58:18 +01:00

100 lines
3.2 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("X-Forgejo-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 != nil && !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 != nil && !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
}