snapshot of https://github.com/RocketChat/Rocket.Chat.git (develop, 2026-09-16; blobs > 131072B omitted)

apps/meteor/client/lib/sdk/sdkTransportEnabled.ts

@@ -0,0 +1,28 @@
+const KEY = 'sdk_transport';
+const META_NAME = 'rc-sdk-transport-enabled';
+
+/**
+ * Runtime flag that gates the SDK-over-DDP transport migration. Three sources,
+ * checked in order:
+ *   1. URL parameter `?sdk_transport=on|off` — per-tab override (highest).
+ *   2. `rc-config-sdk_transport` in localStorage — persisted per-user opt-in.
+ *   3. `<meta name="rc-sdk-transport-enabled" content="on|off">` injected by
+ *      the server from the `SDK_DDP_Transport_Enabled` admin setting — global
+ *      opt-in / kill-switch.
+ *
+ * Default is `false` (legacy Meteor DDP transport) when none of the three
+ * resolves, so the migration ships dormant for staged rollout.
+ */
+export const isSdkTransportEnabled = (): boolean => {
+	if (typeof window === 'undefined') return false;
+	try {
+		const fromUrl = new URLSearchParams(window.location.search).get(KEY);
+		if (fromUrl === 'on') return true;
+		if (fromUrl === 'off') return false;
+		if (window.localStorage.getItem(`rc-config-${KEY}`) === 'on') return true;
+		const meta = window.document?.querySelector(`meta[name="${META_NAME}"]`);
+		return meta?.getAttribute('content') === 'on';
+	} catch {
+		return false;
+	}
+};