feat: implement one-time admin token generation and upgrade process

src/app/actions/set-user-admin.ts

@@ -0,0 +1,30 @@
+'use server';
+
+import { auth } from '@/lib/auth';
+import db from '@/lib/db';
+import { user } from '@/lib/model/auth-schema';
+import { eq } from 'drizzle-orm';
+import { headers } from 'next/headers';
+import { verifyAdminToken } from './verify-admin-token';
+
+export async function setUserAsAdmin(email: string, adminToken: string): Promise<{ success: boolean; error?: string }> {
+  // Verify the token is valid
+  const tokenResult = await verifyAdminToken(adminToken);
+  
+  if (!tokenResult.valid) {
+    return { success: false, error: 'Invalid or expired admin token' };
+  }
+
+  try {
+    // Update user admin flag
+    await db.update(user).set({ admin: true }).where(eq(user.email, email));
+    
+    // Clear the token so it can't be used again
+    delete process.env.ADMIN_SIGNUP_TOKEN;
+    
+    return { success: true };
+  } catch (error) {
+    console.error('Error setting admin:', error);
+    return { success: false, error: 'Failed to set admin status' };
+  }
+}

src/app/actions/verify-admin-token.ts

@@ -0,0 +1,14 @@
+'use server';
+
+export async function verifyAdminToken(token: string): Promise<{ valid: boolean }> {
+  const storedToken = process.env.ADMIN_SIGNUP_TOKEN;
+  
+  // Token is invalid if:
+  // 1. No token exists (already used or no token was generated)
+  // 2. Provided token doesn't match
+  if (!storedToken || token !== storedToken) {
+    return { valid: false };
+  }
+
+  return { valid: true };
+}