feat: add internal API key bypass for service-to-service calls

Allows trusted internal services (e.g. rnotes) to push shapes
without EncryptID auth by passing X-Internal-Key header.
Key is set via INTERNAL_API_KEY env var.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -11,6 +11,7 @@ services:
       - NODE_ENV=production
       - STORAGE_DIR=/data/communities
       - PORT=3000
+      - INTERNAL_API_KEY=${INTERNAL_API_KEY}
     labels:
       - "traefik.enable=true"
       # Only handle subdomains (rspace-prod handles main domain)

server/index.ts

@@ -38,6 +38,7 @@ async function getSpaceConfig(slug: string): Promise<SpaceAuthConfig | null> {
 }
 
 const PORT = Number(process.env.PORT) || 3000;
+const INTERNAL_API_KEY = process.env.INTERNAL_API_KEY || "";
 const DIST_DIR = resolve(import.meta.dir, "../dist");
 
 // WebSocket data type
@@ -486,24 +487,30 @@ async function handleAPI(req: Request, url: URL): Promise<Response> {
 	) {
 		const slug = url.pathname.split("/")[3];
 
-		// Check space access (write required)
-		const token = extractToken(req.headers);
-		const access = await evaluateSpaceAccess(slug, token, req.method, {
-			getSpaceConfig,
-		});
+		// Allow internal service-to-service calls with shared key
+		const internalKey = req.headers.get("X-Internal-Key");
+		const isInternalCall = INTERNAL_API_KEY && internalKey === INTERNAL_API_KEY;
 
-		if (!access.allowed) {
-			return Response.json(
-				{ error: access.reason },
-				{ status: access.claims ? 403 : 401, headers: corsHeaders }
-			);
-		}
+		if (!isInternalCall) {
+			// Check space access (write required) for external calls
+			const token = extractToken(req.headers);
+			const access = await evaluateSpaceAccess(slug, token, req.method, {
+				getSpaceConfig,
+			});
 
-		if (access.readOnly) {
-			return Response.json(
-				{ error: "Write access required to add shapes" },
-				{ status: 403, headers: corsHeaders }
-			);
+			if (!access.allowed) {
+				return Response.json(
+					{ error: access.reason },
+					{ status: access.claims ? 403 : 401, headers: corsHeaders }
+				);
+			}
+
+			if (access.readOnly) {
+				return Response.json(
+					{ error: "Write access required to add shapes" },
+					{ status: 403, headers: corsHeaders }
+				);
+			}
 		}
 
 		try {