fix: use env variable to set cookie domain

Author: nirjan-dev

apps/backend/.env.example

@@ -4,3 +4,4 @@ GOOGLE_CLIENT_ID=
 GOOGLE_CLIENT_SECRET=
 BETTER_AUTH_SECRET=
 BETTER_AUTH_URL=http://localhost:3000 # Base URL of your app
+COOKIE_DOMAIN=

apps/backend/src/env.ts

@@ -6,6 +6,7 @@ export const getEnv = (c: Context) => createEnv({
   server: {
     FRONTEND_URL: z.string().url(),
     DB_FILE_NAME: z.string().url(),
+    COOKIE_DOMAIN: z.string().url(),
     BETTER_AUTH_SECRET: z.string(),
     BETTER_AUTH_URL: z.string().url(),
     GOOGLE_CLIENT_ID: z.string(),

apps/backend/src/lib/auth.ts

@@ -22,7 +22,7 @@ export const auth = (c: Context) => betterAuth({
   advanced: {
     crossSubDomainCookies: {
       enabled: true,
-      domain: getEnv(c).FRONTEND_URL.replace(/^https?:\/\//, ''),
+      domain: getEnv(c).COOKIE_DOMAIN,
     },
   },
 })

fly.toml

@@ -6,6 +6,10 @@
 app = 'periodos'
 primary_region = 'hkg'
 
+[env]
+FRONTEND_URL = "https://periodos.nirjan.net"
+COOKIE_DOMAIN = "https://nirjan.net"
+
 [build]
 
 [http_service]