Astra
17232bd5a2
Notifications: staff turn them on per device from a new Notifications page, pick each type (bans, gags, mutes and silences added or lifted, server down and back up) and quiet hours. A watcher polls SimpleAdmin's tables, so in-game penalties are sent too. Web Push with VAPID and RFC 8291 encryption in internal/push, standard library only. Tables in sql/push.sql, created at startup; the VAPID key is made on first start and kept in saw_settings. Penalty notifications link to the public list searching for the player (#bans?q=<steamid64>). The Android app delegates notifications (versionCode 3). Caching: pages, scripts and styles are served with Cache-Control: no-cache and an ETag, so a deploy shows up at once instead of after Cloudflare's default 4-hour browser cache.
47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
package web
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import (
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"crypto/sha256"
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"encoding/hex"
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"io/fs"
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"net/http"
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"sync"
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)
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// The pages, scripts and styles are embedded, so they only change with a new build. They're served
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// with Cache-Control: no-cache and an ETag (a hash of the file): browsers, the Android app and
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// Cloudflare check each time and get a quick 304 while the file is unchanged, and a new deploy
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// shows up at once. Without these headers Cloudflare tells browsers to keep them for 4 hours.
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var assetTags = sync.OnceValue(func() map[string]string {
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tags := map[string]string{}
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static, _ := fs.Sub(assets, "assets")
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_ = fs.WalkDir(static, ".", func(path string, d fs.DirEntry, err error) error {
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if err != nil || d.IsDir() {
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return err
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}
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data, err := fs.ReadFile(static, path)
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if err != nil {
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return err
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}
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sum := sha256.Sum256(data)
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tags[path] = `"` + hex.EncodeToString(sum[:8]) + `"`
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return nil
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})
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return tags
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})
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// revalidate sets the caching headers for an embedded file. http.ServeContent answers a matching
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// If-None-Match with 304 from the ETag set here.
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func revalidate(w http.ResponseWriter, name string) {
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w.Header().Set("Cache-Control", "no-cache")
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if tag, ok := assetTags()[name]; ok {
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w.Header().Set("ETag", tag)
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}
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}
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// serveAsset serves one embedded file, see revalidate.
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func serveAsset(w http.ResponseWriter, r *http.Request, static fs.FS, name string) {
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revalidate(w, name)
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http.ServeFileFS(w, r, static, name)
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}
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