mirror of https://github.com/go-gitea/gitea.git
129 lines
4.0 KiB
Go
129 lines
4.0 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package httpcache
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import (
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"encoding/base64"
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"fmt"
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"net/http"
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"os"
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"strconv"
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"strings"
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"time"
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"code.gitea.io/gitea/modules/setting"
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)
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// AddCacheControlToHeader adds suitable cache-control headers to response
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func AddCacheControlToHeader(h http.Header, maxAge time.Duration, additionalDirectives ...string) {
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directives := make([]string, 0, 2+len(additionalDirectives))
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if setting.IsProd {
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if maxAge == 0 {
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directives = append(directives, "max-age=0", "private", "must-revalidate")
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} else {
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directives = append(directives, "private", "max-age="+strconv.Itoa(int(maxAge.Seconds())))
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}
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} else {
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directives = append(directives, "max-age=0", "private", "must-revalidate")
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// to remind users they are using non-prod setting.
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h.Add("X-Gitea-Debug", "RUN_MODE="+setting.RunMode)
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}
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h.Set("Cache-Control", strings.Join(append(directives, additionalDirectives...), ", "))
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}
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// generateETag generates an ETag based on size, filename and file modification time
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func generateETag(fi os.FileInfo) string {
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etag := fmt.Sprint(fi.Size()) + fi.Name() + fi.ModTime().UTC().Format(http.TimeFormat)
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return `"` + base64.StdEncoding.EncodeToString([]byte(etag)) + `"`
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}
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// HandleTimeCache handles time-based caching for a HTTP request
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func HandleTimeCache(req *http.Request, w http.ResponseWriter, fi os.FileInfo) (handled bool) {
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return HandleGenericTimeCache(req, w, fi.ModTime())
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}
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// HandleGenericTimeCache handles time-based caching for a HTTP request
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func HandleGenericTimeCache(req *http.Request, w http.ResponseWriter, lastModified time.Time) (handled bool) {
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AddCacheControlToHeader(w.Header(), setting.StaticCacheTime)
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ifModifiedSince := req.Header.Get("If-Modified-Since")
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if ifModifiedSince != "" {
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t, err := time.Parse(http.TimeFormat, ifModifiedSince)
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if err == nil && lastModified.Unix() <= t.Unix() {
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w.WriteHeader(http.StatusNotModified)
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return true
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}
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}
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w.Header().Set("Last-Modified", lastModified.Format(http.TimeFormat))
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return false
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}
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// HandleFileETagCache handles ETag-based caching for a HTTP request
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func HandleFileETagCache(req *http.Request, w http.ResponseWriter, fi os.FileInfo) (handled bool) {
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etag := generateETag(fi)
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return HandleGenericETagCache(req, w, etag)
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}
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// HandleGenericETagCache handles ETag-based caching for a HTTP request.
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// It returns true if the request was handled.
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func HandleGenericETagCache(req *http.Request, w http.ResponseWriter, etag string) (handled bool) {
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if len(etag) > 0 {
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w.Header().Set("Etag", etag)
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if checkIfNoneMatchIsValid(req, etag) {
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w.WriteHeader(http.StatusNotModified)
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return true
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}
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}
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AddCacheControlToHeader(w.Header(), setting.StaticCacheTime)
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return false
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}
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// checkIfNoneMatchIsValid tests if the header If-None-Match matches the ETag
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func checkIfNoneMatchIsValid(req *http.Request, etag string) bool {
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ifNoneMatch := req.Header.Get("If-None-Match")
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if len(ifNoneMatch) > 0 {
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for _, item := range strings.Split(ifNoneMatch, ",") {
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item = strings.TrimSpace(item)
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if item == etag {
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return true
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}
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}
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}
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return false
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}
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// HandleGenericETagTimeCache handles ETag-based caching with Last-Modified caching for a HTTP request.
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// It returns true if the request was handled.
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func HandleGenericETagTimeCache(req *http.Request, w http.ResponseWriter, etag string, lastModified time.Time) (handled bool) {
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if len(etag) > 0 {
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w.Header().Set("Etag", etag)
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}
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if !lastModified.IsZero() {
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w.Header().Set("Last-Modified", lastModified.Format(http.TimeFormat))
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}
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if len(etag) > 0 {
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if checkIfNoneMatchIsValid(req, etag) {
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w.WriteHeader(http.StatusNotModified)
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return true
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}
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}
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if !lastModified.IsZero() {
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ifModifiedSince := req.Header.Get("If-Modified-Since")
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if ifModifiedSince != "" {
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t, err := time.Parse(http.TimeFormat, ifModifiedSince)
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if err == nil && lastModified.Unix() <= t.Unix() {
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w.WriteHeader(http.StatusNotModified)
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return true
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}
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}
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}
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AddCacheControlToHeader(w.Header(), setting.StaticCacheTime)
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return false
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}
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