Initial MRP foundation scaffold

server/src/lib/rbac.ts

@@ -0,0 +1,30 @@
+import type { PermissionKey } from "@mrp/shared";
+import type { NextFunction, Request, Response } from "express";
+
+import { fail } from "./http.js";
+
+export function requireAuth(request: Request, response: Response, next: NextFunction) {
+  if (!request.authUser) {
+    return fail(response, 401, "UNAUTHORIZED", "Authentication is required.");
+  }
+
+  next();
+}
+
+export function requirePermissions(requiredPermissions: PermissionKey[]) {
+  return (request: Request, response: Response, next: NextFunction) => {
+    if (!request.authUser) {
+      return fail(response, 401, "UNAUTHORIZED", "Authentication is required.");
+    }
+
+    const available = new Set(request.authUser.permissions);
+    const hasAll = requiredPermissions.every((permission) => available.has(permission));
+
+    if (!hasAll) {
+      return fail(response, 403, "FORBIDDEN", "You do not have access to this resource.");
+    }
+
+    next();
+  };
+}
+