/**
 * 授权验证模块
 */
const LicenseManager = {
    apiUrl: 'https://textpress.cn/api/license/verify',
    productSlug: 'my-theme',
    cacheKey: 'license_cache',
    cacheTime: 24 * 60 * 60 * 1000, // 24小时
    
    // 验证授权
    async verify(licenseKey) {
        // 检查缓存
        const cached = this.getCache(licenseKey);
        if (cached) return cached;
        
        // 调用 API
        try {
            const params = new URLSearchParams({
                license_key: licenseKey,
                domain: window.location.hostname,
                product_slug: this.productSlug
            });
            
            const response = await fetch(`${this.apiUrl}?${params}`);
            const data = await response.json();
            
            // 缓存结果
            this.setCache(licenseKey, data);
            
            return data;
        } catch (error) {
            console.error('授权验证失败:', error);
            return { valid: false, code: 'NETWORK_ERROR', message: '网络请求失败' };
        }
    },
    
    // 获取缓存
    getCache(licenseKey) {
        try {
            const data = JSON.parse(localStorage.getItem(this.cacheKey));
            if (!data || data.key !== this.hash(licenseKey)) return null;
            if (Date.now() - data.time > this.cacheTime) return null;
            return data.result;
        } catch {
            return null;
        }
    },
    
    // 设置缓存
    setCache(licenseKey, result) {
        localStorage.setItem(this.cacheKey, JSON.stringify({
            key: this.hash(licenseKey),
            time: Date.now(),
            result
        }));
    },
    
    // 简单哈希
    hash(str) {
        let hash = 0;
        for (let i = 0; i < str.length; i++) {
            hash = ((hash << 5) - hash) + str.charCodeAt(i);
            hash |= 0;
        }
        return hash.toString(16);
    },
    
    // 显示错误提示
    showError(data) {
        const messages = {
            'INVALID_LICENSE': '授权码无效，请检查是否输入正确',
            'LICENSE_EXPIRED': '授权已过期，请续费后继续使用',
            'DOMAIN_NOT_AUTHORIZED': '当前域名未授权，请在用户中心绑定域名',
            'NETWORK_ERROR': '网络连接失败，请检查网络后重试'
        };
        alert(messages[data.code] || data.message);
    }
};

// 使用示例
async function checkLicense() {
    const result = await LicenseManager.verify('XXXX-XXXX-XXXX-XXXX');
    if (result.valid) {
        console.log('授权有效', result.license);
    } else {
        LicenseManager.showError(result);
    }
}

<?php
/**
 * WordPress 主题/插件授权验证
 */

// 添加设置页面
add_action('admin_menu', function() {
    add_options_page('授权管理', '授权管理', 'manage_options', 'license-settings', 'render_license_page');
});

// 渲染设置页面
function render_license_page() {
    if (isset($_POST['license_key'])) {
        update_option('my_theme_license', sanitize_text_field($_POST['license_key']));
        delete_transient('my_theme_license_check');
        echo '<div class="notice notice-success"><p>授权码已保存</p></div>';
    }
    
    $license = get_option('my_theme_license', '');
    $status = verify_license_status();
    ?>
    <div class="wrap">
        <h1>授权管理</h1>
        <form method="post">
            <table class="form-table">
                <tr>
                    <th>授权码</th>
                    <td>
                        <input type="text" name="license_key" value="<?= esc_attr($license) ?>" class="regular-text">
                        <p class="description">请输入购买时获得的授权码</p>
                    </td>
                </tr>
                <tr>
                    <th>授权状态</th>
                    <td>
                        <?php if ($status['valid']): ?>
                            <span style="color:green">已授权</span>
                            - 到期时间：<?= $status['license']['expires_at'] ?>
                        <?php else: ?>
                            <span style="color:red">未授权</span>
                            - <?= $status['message'] ?>
                        <?php endif; ?>
                    </td>
                </tr>
            </table>
            <?php submit_button('保存授权码'); ?>
        </form>
    </div>
    <?php
}

// 验证授权状态
function verify_license_status() {
    $license = get_option('my_theme_license', '');
    if (!$license) {
        return ['valid' => false, 'code' => 'NO_LICENSE', 'message' => '请输入授权码'];
    }
    
    // 使用 transient 缓存
    $cached = get_transient('my_theme_license_check');
    if ($cached !== false) return $cached;
    
    // 调用 API
    $response = wp_remote_get('https://textpress.cn/api/license/verify?' . http_build_query([
        'license_key' => $license,
        'domain' => $_SERVER['HTTP_HOST'],
        'product_slug' => 'my-theme'
    ]));
    
    if (is_wp_error($response)) {
        return ['valid' => false, 'code' => 'NETWORK_ERROR', 'message' => '网络请求失败'];
    }
    
    $result = json_decode(wp_remote_retrieve_body($response), true);
    set_transient('my_theme_license_check', $result, DAY_IN_SECONDS);
    
    return $result;
}

// 在后台显示授权提示
add_action('admin_notices', function() {
    $status = verify_license_status();
    if (!$status['valid']) {
        echo '<div class="notice notice-warning"><p>主题未授权：' . esc_html($status['message']) . 
             ' <a href="' . admin_url('options-general.php?page=license-settings') . '">去授权</a></p></div>';
    }
});