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