feature: prepare for demo mode

apps/dashboard/src/middleware.ts

@@ -45,6 +45,10 @@ export default (request: NextRequest) => {
     const response = NextResponse.next();
     const token = request.cookies.get('session')?.value ?? null;
 
+    if (process.env.DEMO_USER_ID) {
+      return response;
+    }
+
     if (!isPublicRoute(request) && token === null) {
       return NextResponse.redirect(new URL('/login', request.url));
     }

packages/auth/src/session.ts

@@ -37,9 +37,35 @@ export const EMPTY_SESSION: SessionValidationResult = {
   userId: null,
 };
 
+export async function createDemoSession(
+  userId: string,
+): Promise<SessionValidationResult> {
+  const user = await db.user.findUniqueOrThrow({
+    where: {
+      id: userId,
+    },
+  });
+
+  return {
+    user,
+    userId: user.id,
+    session: {
+      id: '1',
+      userId: user.id,
+      expiresAt: new Date(Date.now() + 1000 * 60 * 60 * 24 * 30 * 365),
+      createdAt: new Date(),
+      updatedAt: new Date(),
+    },
+  };
+}
+
 export async function validateSessionToken(
   token: string | null,
 ): Promise<SessionValidationResult> {
+  if (process.env.DEMO_USER_ID) {
+    return createDemoSession(process.env.DEMO_USER_ID);
+  }
+
   if (!token) {
     return EMPTY_SESSION;
   }

packages/trpc/src/trpc.ts

@@ -88,7 +88,14 @@ const enforceUserIsAuthed = t.middleware(async ({ ctx, next }) => {
 });
 
 // Only used on protected routes
-const enforceAccess = t.middleware(async ({ ctx, next, rawInput }) => {
+const enforceAccess = t.middleware(async ({ ctx, next, rawInput, type }) => {
+  if (type === 'mutation' && process.env.DEMO_USER_ID) {
+    throw new TRPCError({
+      code: 'UNAUTHORIZED',
+      message: 'You are not allowed to do this in demo mode',
+    });
+  }
+
   if (has('projectId', rawInput)) {
     const access = await getProjectAccessCached({
       userId: ctx.session.userId!,