0.2.55 - Remote config/Request fixes

server/internal/api/remote_config.go

@@ -0,0 +1,36 @@
+package api
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"net/http"
+	"strconv"
+)
+
+// handleRemoteConfig serves one app-scoped, immutable-at-runtime document. It is public
+// for the same reason the update verdict is public: a fresh install and a signed-out TV
+// must be able to warm the next launch. No viewer or session data belongs in this answer.
+func (s *Server) handleRemoteConfig(w http.ResponseWriter, r *http.Request) {
+	body, err := json.Marshal(s.cfg.RemoteConfig)
+	if err != nil {
+		// Config is validated during start-up, so this is defensive rather than an expected
+		// operational failure.
+		writeError(w, http.StatusInternalServerError, "remote configuration unavailable")
+		return
+	}
+	digest := sha256.Sum256(body)
+	etag := `"rc-` + hex.EncodeToString(digest[:12]) + `"`
+	w.Header().Set("Cache-Control", "no-cache")
+	w.Header().Set("ETag", etag)
+	w.Header().Set("X-Memby-Config-Version", configVersionHeader(s.cfg.RemoteConfig.ConfigVersion))
+	if r.Header.Get("If-None-Match") == etag {
+		w.WriteHeader(http.StatusNotModified)
+		return
+	}
+	writeRaw(w, http.StatusOK, body)
+}
+
+func configVersionHeader(version int64) string {
+	return strconv.FormatInt(version, 10)
+}