add: simple validation and sanitizing

src/auth.ts

@@ -125,7 +125,7 @@ const authConfig: SvelteKitAuthConfig = {
 		}
 	},
 	secret: env.AUTH_SECRET,
-	trustHost: true
+	trustHost: env.AUTH_TRUST_HOST === 'true'
 };
 
 export const { handle, signIn, signOut } = SvelteKitAuth(authConfig);