65 lines
1.7 KiB
Go
65 lines
1.7 KiB
Go
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package middleware
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import (
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"net/http"
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"os"
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"path"
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"path/filepath"
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"strconv"
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"github.com/amalfra/etag"
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)
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//DisableCache writes the disable cache header on the responses
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func DisableCache(w http.ResponseWriter) {
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w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
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w.Header().Set("Expires", "Thu, 1 Jan 1970 00:00:00 GMT")
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}
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func setCacheSeconds(seconds int, w http.ResponseWriter) {
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secondsStr := strconv.Itoa(seconds)
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w.Header().Set("Cache-Control", "public, max-age="+secondsStr)
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}
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// ProcessEtags gets and sets ETags for caching purposes
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func ProcessEtags(w http.ResponseWriter, r *http.Request) int {
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info, err := os.Stat(filepath.Join("webroot", r.URL.Path))
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if err != nil {
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return 0
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}
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localContentEtag := etag.Generate(info.ModTime().String(), true)
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if remoteEtagHeader := r.Header.Get("If-None-Match"); remoteEtagHeader != "" {
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if remoteEtagHeader == localContentEtag {
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return http.StatusNotModified
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}
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}
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w.Header().Set("Etag", localContentEtag)
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return 0
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}
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// SetCachingHeaders will set the cache control header of a response
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func SetCachingHeaders(w http.ResponseWriter, r *http.Request) {
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setCacheSeconds(getCacheDurationSecondsForPath(r.URL.Path), w)
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}
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func getCacheDurationSecondsForPath(filePath string) int {
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if path.Base(filePath) == "thumbnail.jpg" {
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// Thumbnails re-generate during live
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return 20
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} else if path.Ext(filePath) == ".js" || path.Ext(filePath) == ".css" {
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// Cache javascript & CSS
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return 60
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} else if path.Ext(filePath) == ".ts" {
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// Cache video segments as long as you want. They can't change.
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// This matters most for local hosting of segments for recordings
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// and not for live or 3rd party storage.
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return 31557600
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}
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// Default cache length in seconds
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return 30 * 60
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}
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