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` // EffectiveSWOfflineHTML returns custom HTML when set, otherwise the built-in default. func EffectiveSWOfflineHTML(cfg ConfigSnapshot) string { if strings.TrimSpace(cfg.SWOfflineHTML) == "" { return DefaultSWOfflineHTML } return cfg.SWOfflineHTML } // ServiceWorkerSupportFiles returns the sw.js script and offline contact page. // The sw.js content is derived from the offline HTML (see defaultSWJS) so that // HTML-only edits change the script, forcing browsers to re-install the worker // and re-cache the updated page. func ServiceWorkerSupportFiles(cfg ConfigSnapshot) []SupportFile { if !cfg.SWOfflineEnabled { return nil } html := EffectiveSWOfflineHTML(cfg) return []SupportFile{ {Path: swDirPrefix + "sw.js", Content: defaultSWJS(html)}, {Path: swDirPrefix + "offline.html", Content: html}, } } // swJSTemplate is the service worker body. The cache name is replaced with a // version derived from the offline HTML: editing the HTML changes the cache // name, which changes the sw.js bytes, which makes the browser re-install the // worker (sw.js is served with Cache-Control: no-cache) and fetch the new // /offline.html into the fresh cache during install. const swJSTemplate = `var CACHE = "__CACHE_NAME__"; var OFFLINE = "/offline.html"; self.addEventListener("install", function (e) { e.waitUntil(caches.open(CACHE).then(function (c) { return c.addAll([OFFLINE]); })); self.skipWaiting(); }); self.addEventListener("activate", function (e) { e.waitUntil(caches.keys().then(function (keys) { return Promise.all(keys.filter(function (k) { return k.indexOf("openflare-offline-") === 0 && k !== CACHE; }).map(function (k) { return caches.delete(k); })); })); self.clients.claim(); }); self.addEventListener("fetch", function (e) { if (e.request.method !== "GET" || e.request.mode !== "navigate") { return; } e.respondWith( fetch(e.request).catch(function () { return caches.match(e.request).then(function (r) { return r || caches.match(OFFLINE); }); }) ); }); ` func defaultSWJS(offlineHTML string) string { sum := sha256.Sum256([]byte(offlineHTML)) version := hex.EncodeToString(sum[:])[:12] return strings.ReplaceAll(swJSTemplate, "__CACHE_NAME__", "openflare-offline-"+version) } // routeSWEnabled returns true when SW offline fallback applies to this route. func routeSWEnabled(routeDomains []string, cfg ConfigSnapshot) bool { if !cfg.SWOfflineEnabled || len(cfg.SWOfflineDomains) == 0 { return false } scope := make(map[string]struct{}, len(cfg.SWOfflineDomains)) for _, d := range cfg.SWOfflineDomains { scope[d] = struct{}{} } for _, d := range routeDomains { if _, ok := scope[d]; ok { return true } } return false } // renderServiceWorkerChallenger emits SW static locations and the homepage // challenge intercept for HTTPS server blocks. func renderServiceWorkerChallenger(_ ConfigSnapshot) string { var builder strings.Builder builder.WriteString("\n location = /sw.js {\n") builder.WriteString(" alias " + SWDirPlaceholder + "/sw.js;\n") builder.WriteString(" default_type application/javascript;\n") builder.WriteString(" add_header Service-Worker-Allowed /;\n") builder.WriteString(" add_header Cache-Control \"no-cache\";\n") builder.WriteString(" }\n\n") builder.WriteString(" location = /offline.html {\n") builder.WriteString(" alias " + SWDirPlaceholder + "/offline.html;\n") builder.WriteString(" default_type text/html;\n") builder.WriteString(" add_header Cache-Control \"no-cache\";\n") builder.WriteString(" }\n\n") builder.WriteString(" location = /__openflare_sw_challenge {\n") builder.WriteString(" internal;\n") builder.WriteString(" # hit when sw.runtime.check() intercepts the homepage in the access phase\n") builder.WriteString(" content_by_lua_file " + SWDirPlaceholder + "/challenge.lua;\n") builder.WriteString(" }\n") return builder.String() }