atlus/frontend/js/auth.js

/* Atlus — Login screen logic */
(function () {
    'use strict';

    // Redirect to desktop if already authenticated
    const token = sessionStorage.getItem('atlus_token');
    if (token) {
        window.location.href = '/desktop';
        return;
    }

    const form = document.getElementById('loginForm');
    const usernameInput = document.getElementById('username');
    const passwordInput = document.getElementById('password');
    const loginBtn = document.getElementById('loginBtn');
    const errorEl = document.getElementById('loginError');

    form.addEventListener('submit', async (e) => {
        e.preventDefault();
        errorEl.textContent = '';
        loginBtn.disabled = true;
        loginBtn.textContent = 'Signing in…';

        try {
            const res = await fetch('/api/auth/login', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({
                    username: usernameInput.value.trim(),
                    password: passwordInput.value,
                }),
            });

            if (!res.ok) {
                const data = await res.json().catch(() => ({}));
                throw new Error(data.detail || 'Invalid credentials');
            }

            const data = await res.json();
            sessionStorage.setItem('atlus_token', data.token);
            sessionStorage.setItem('atlus_user', data.username);
            window.location.href = '/desktop';
        } catch (err) {
            errorEl.textContent = err.message;
            loginBtn.disabled = false;
            loginBtn.textContent = 'Sign In';
            passwordInput.value = '';
            passwordInput.focus();
        }
    });

    usernameInput.focus();
})();