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fix: use custom domain for auth baseURL in production

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VERCEL_URL returns deployment URL (tpmjs-xxx.vercel.app) not custom domain.
This was causing session cookies to be set for wrong domain.
Now prioritizes BETTER_AUTH_URL, then checks VERCEL_ENV=production to use tpmjs.com.
This commit is contained in:
Ajax Davis 2026-01-02 00:12:55 +10:00
parent 1c9a328929
commit 4451eddc91
2 changed files with 7 additions and 2 deletions
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2
apps/web/next-env.d.ts vendored
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@ -1,6 +1,6 @@
/// <reference types="next" />
/// <reference types="next/image-types/global" />
import "./.next/types/routes.d.ts";
import "./.next/dev/types/routes.d.ts";
// NOTE: This file should not be edited
// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.

7
apps/web/src/lib/auth.ts
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@ -3,9 +3,14 @@ import { betterAuth } from 'better-auth';
import { prismaAdapter } from 'better-auth/adapters/prisma';
import { sendVerificationEmail } from './email';
// Determine base URL: use env var, or Vercel URL, or default to production
// Determine base URL for auth - MUST match the domain users are browsing on
// VERCEL_URL is the deployment URL (e.g., tpmjs-xxx.vercel.app), not the custom domain
// So we prioritize BETTER_AUTH_URL or fall back to the production domain
const getBaseURL = () => {
if (process.env.BETTER_AUTH_URL) return process.env.BETTER_AUTH_URL;
// In production, always use the custom domain, not VERCEL_URL
if (process.env.VERCEL_ENV === 'production') return 'https://tpmjs.com';
// For preview deployments, use the Vercel URL
if (process.env.VERCEL_URL) return `https://${process.env.VERCEL_URL}`;
return 'https://tpmjs.com';
};