0.2.65 - End Credits wiring / Gateway: 0.1.45 - Credits

server/internal/config/config.go

@@ -22,6 +22,22 @@ type Config struct {
 	// Defaults to EmbyURL; set it when the gateway talks to Emby over a network the
 	// TVs cannot reach.
 	EmbyPublicURL string
+	// EmbyMediaURL is the address the gateway reads *media bytes* from, which is a
+	// different question from how it reads metadata and is the only place the difference
+	// costs anything.
+	//
+	// Credits detection is the one thing on the server side that opens a media file, and it
+	// does so with ranged reads over HTTP. A metadata call is a few kilobytes and does not
+	// care which way it is routed; a scan is megabytes, and where EmbyURL is a public
+	// hostname — which it legitimately may be, since the gateway and Emby need not share a
+	// network — every one of those ranged reads leaves the host for the internet-facing
+	// edge, pays TLS, and comes back in through a reverse proxy that is free to buffer the
+	// response and discard the range economy entirely.
+	//
+	// So this is stated separately rather than inferred: there is no way to look at a URL
+	// and tell whether it happens to resolve locally. Unset, it falls back to EmbyURL and
+	// nothing changes.
+	EmbyMediaURL string
 
 	DatabaseURL string
 	RedisURL    string
@@ -191,6 +207,7 @@ func Load() (Config, error) {
 		ListenAddr:        env("MEMBY_LISTEN_ADDR", ":8080"),
 		EmbyURL:           strings.TrimRight(os.Getenv("MEMBY_EMBY_URL"), "/"),
 		EmbyPublicURL:     strings.TrimRight(os.Getenv("MEMBY_EMBY_PUBLIC_URL"), "/"),
+		EmbyMediaURL:      strings.TrimRight(os.Getenv("MEMBY_EMBY_MEDIA_URL"), "/"),
 		DatabaseURL:       os.Getenv("MEMBY_DATABASE_URL"),
 		RedisURL:          env("MEMBY_REDIS_URL", "redis://localhost:6379/0"),
 		ClientName:        env("MEMBY_CLIENT_NAME", "MbyATV"),
@@ -262,6 +279,9 @@ func Load() (Config, error) {
 	if c.EmbyPublicURL == "" {
 		c.EmbyPublicURL = c.EmbyURL
 	}
+	if c.EmbyMediaURL == "" {
+		c.EmbyMediaURL = c.EmbyURL
+	}
 	if c.ReleasePublishToken != "" && c.PublicURL == "" {
 		return c, fmt.Errorf("MEMBY_PUBLIC_URL is required when release publishing is enabled")
 	}