92 lines
2.2 KiB
Go
92 lines
2.2 KiB
Go
package assets
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import (
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"net/url"
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"path/filepath"
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"strconv"
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"strings"
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)
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func getSessionKey(sessionID uint64) string {
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// Based on timestamp, changes once per week. Check pkg/flakeid for understanding sessionID
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return strconv.FormatUint(sessionID>>50, 10)
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}
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func ResolveURL(baseurl string, rawurl string) string {
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if !isRelativeCachable(rawurl) {
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return rawurl
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}
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base, _ := url.ParseRequestURI(baseurl) // fn Only for base urls
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u, _ := url.Parse(rawurl) // TODO: handle errors ?
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if base == nil || u == nil {
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return rawurl
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}
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return base.ResolveReference(u).String() // ResolveReference same as base.Parse(rawurl)
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}
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func isRelativeCachable(relativeURL string) bool {
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if len(relativeURL) == 0 || relativeURL[0] == '#' {
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return false
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}
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return true
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}
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func isCachable(rawurl string) bool {
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u, _ := url.Parse(rawurl)
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if u == nil || u.User != nil {
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return false
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}
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if u.Scheme != "http" && u.Scheme != "https" {
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return false
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}
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ext := filepath.Ext(u.Path)
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return ext == ".css" ||
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ext == ".woff" ||
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ext == ".woff2" ||
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ext == ".ttf" ||
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ext == ".otf" ||
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ext == ".eot"
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}
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func GetFullCachableURL(baseURL string, relativeURL string) (string, bool) {
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if !isRelativeCachable(relativeURL) {
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return relativeURL, false
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}
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fullURL := ResolveURL(baseURL, relativeURL)
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if !isCachable(fullURL) {
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return fullURL, false
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}
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return fullURL, true
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}
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func getCachePath(rawurl string) string {
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return "/" + strings.ReplaceAll(url.QueryEscape(rawurl), "%", "!") // s3 keys are ok with "!"
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}
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func getCachePathWithKey(sessionID uint64, rawurl string) string {
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return getCachePath(rawurl) + "." + getSessionKey(sessionID) // Be carefull with slashes
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}
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func GetCachePathForJS(rawurl string) string {
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return getCachePath(rawurl)
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}
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func GetCachePathForAssets(sessionID uint64, rawurl string) string {
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return getCachePathWithKey(sessionID, rawurl)
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}
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func (r *Rewriter) RewriteURL(sessionID uint64, baseURL string, relativeURL string) string {
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fullURL, cachable := GetFullCachableURL(baseURL, relativeURL)
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if !cachable {
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return fullURL
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}
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u := url.URL{
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Path: r.assetsURL.Path + getCachePathWithKey(sessionID, fullURL),
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Host: r.assetsURL.Host,
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Scheme: r.assetsURL.Scheme,
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}
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return u.String()
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}
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