2026-09-28 20:34:37 +08:00
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<?php
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/**
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* 通用工具函数
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*/
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if (!defined('FB_ROOT')) { http_response_code(403); exit('forbidden'); }
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/** HTML 转义(所有用户内容输出前必须经过它) */
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function e($s) {
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return htmlspecialchars((string)$s, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
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}
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/** 相对时间显示 */
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function fb_fmt_time($ts) {
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$ts = (int)$ts;
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$diff = time() - $ts;
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if ($diff < 0) { $diff = 0; }
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if ($diff < 60) { return '刚刚'; }
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if ($diff < 3600) { return ((int)floor($diff / 60)) . ' 分钟前'; }
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if ($diff < 86400) { return ((int)floor($diff / 3600)) . ' 小时前'; }
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if ($diff < 604800) { return ((int)floor($diff / 86400)) . ' 天前'; }
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if (date('Y', $ts) === date('Y')) { return date('m-d H:i', $ts); }
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return date('Y-m-d H:i', $ts);
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}
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/** 访客 IP(兼容反向代理 / CDN) */
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function fb_client_ip() {
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$keys = ['HTTP_CF_CONNECTING_IP', 'HTTP_X_FORWARDED_FOR', 'HTTP_X_REAL_IP', 'REMOTE_ADDR'];
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foreach ($keys as $k) {
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if (!empty($_SERVER[$k])) {
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$v = explode(',', (string)$_SERVER[$k]);
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$v = trim($v[0]);
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if (filter_var($v, FILTER_VALIDATE_IP)) { return $v; }
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}
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}
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return '0.0.0.0';
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}
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/** 访客 IP 的加盐哈希(不保存明文 IP) */
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function fb_ip_hash() {
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return hash('sha256', fb_client_ip() . '|' . (string)fb_cfg('ip_salt'));
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}
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/** 站点基地址(优先取配置,否则自动探测) */
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function fb_base_url() {
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$b = (string)fb_cfg('base_url', '');
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if ($b !== '') { return rtrim($b, '/'); }
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$https = (!empty($_SERVER['HTTPS']) && strtolower((string)$_SERVER['HTTPS']) !== 'off');
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$scheme = $https ? 'https' : 'http';
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$host = isset($_SERVER['HTTP_HOST']) ? (string)$_SERVER['HTTP_HOST'] : 'localhost';
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$script = isset($_SERVER['SCRIPT_NAME']) ? (string)$_SERVER['SCRIPT_NAME'] : '/index.php';
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$dir = rtrim(str_replace('\\', '/', dirname($script)), '/');
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return $scheme . '://' . $host . $dir;
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}
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/** 跳转并结束 */
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function fb_redirect($url) {
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header('Location: ' . $url);
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exit;
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}
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/** 分类 / 状态 */
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function fb_categories() { return (array)fb_cfg('categories', []); }
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function fb_category_label($k) {
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$c = fb_categories();
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return isset($c[$k]) ? $c[$k] : '其他';
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}
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function fb_statuses() { return (array)fb_cfg('statuses', []); }
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function fb_status_label($k) {
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$s = fb_statuses();
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return isset($s[$k]) ? $s[$k] : (string)$k;
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}
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/** CSRF */
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function fb_csrf_token() {
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if (empty($_SESSION['csrf'])) {
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$_SESSION['csrf'] = bin2hex(random_bytes(16));
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}
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return $_SESSION['csrf'];
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}
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function fb_csrf_ok($t) {
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return !empty($_SESSION['csrf']) && is_string($t) && hash_equals($_SESSION['csrf'], $t);
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}
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/** 频率限制 */
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function fb_rate_check($action, $limit) {
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$pdo = fb_db();
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$since = time() - 3600;
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$st = $pdo->prepare('SELECT COUNT(*) FROM rate_limit WHERE ip_hash=? AND action=? AND created_at>=?');
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$st->execute([fb_ip_hash(), $action, $since]);
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return ((int)$st->fetchColumn()) < (int)$limit;
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}
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function fb_rate_hit($action) {
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$pdo = fb_db();
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$st = $pdo->prepare('INSERT INTO rate_limit(ip_hash, action, created_at) VALUES(?,?,?)');
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$st->execute([fb_ip_hash(), $action, time()]);
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// 顺手清理 2 小时前的记录
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if (random_int(1, 20) === 1) {
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$pdo->exec('DELETE FROM rate_limit WHERE created_at < ' . (time() - 7200));
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}
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}
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/** 文本长度(按字符计) */
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function fb_len($s) {
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return function_exists('mb_strlen') ? mb_strlen((string)$s, 'UTF-8') : strlen((string)$s);
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}
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/** 截断文本 */
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function fb_excerpt($s, $len = 160) {
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$s = trim(preg_replace('/\s+/u', ' ', (string)$s));
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if (fb_len($s) <= $len) { return $s; }
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return (function_exists('mb_substr') ? mb_substr($s, 0, $len, 'UTF-8') : substr($s, 0, $len)) . '…';
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}
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/** 校验昵称:1~24 字符,不含换行 */
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function fb_valid_name($s) {
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$s = trim((string)$s);
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if ($s === '' || fb_len($s) > 24) { return false; }
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if (preg_match('/[\r\n\t]/', $s)) { return false; }
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return true;
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}
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/** 校验正文:2~5000 字符 */
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function fb_valid_body($s) {
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$s = trim((string)$s);
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$n = fb_len($s);
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return ($n >= 2 && $n <= 5000);
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}
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/** 构建当前查询串(保留筛选条件) */
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function fb_qs(array $over = []) {
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$q = $_GET;
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foreach ($over as $k => $v) {
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if ($v === null) { unset($q[$k]); } else { $q[$k] = $v; }
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}
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$q = array_filter($q, function ($v) { return $v !== '' && $v !== null; });
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return $q ? ('?' . http_build_query($q)) : '';
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}
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/* ---------------- 审核(先审后显) ---------------- */
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/** 审核总开关:开启后新提交的问题默认不公开,需管理员审核通过才显示 */
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function fb_moderation_on() {
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return (bool)fb_cfg('moderation.enabled', true);
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}
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/** 当前访问者是否已登录审核后台(admin.php 登录后置位) */
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function fb_is_admin() {
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return !empty($_SESSION['fb_admin']) && $_SESSION['fb_admin'] === 1;
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}
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/** 该问题对当前访客可见吗?(管理员可看全部) */
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function fb_thread_public(array $thread) {
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if (!fb_moderation_on()) { return true; }
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if (isset($thread['visible']) && (int)$thread['visible'] === 1) { return true; }
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return fb_is_admin();
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}
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2026-09-28 22:53:55 +08:00
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/* ---------------- 安装状态 ---------------- */
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/** FeedLite 开源仓库地址(页脚版权链接的默认值,可在后台改) */
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function fb_credit_url_default() {
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return 'https://code.yangyq.net/laoyang/FeedLite';
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}
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/**
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* 是否已安装:数据库文件存在且非空。
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* ★ 必须用 fb_cfg_file()(纯文件配置)而不是 fb_cfg():
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* 后者会去读 settings 表 -> 触发 fb_db() -> 就地建出一个空库,
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* 那样第二秒就永远进不去安装向导了(安装态会被自己"装"出来)。
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*/
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function fb_installed() {
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$p = (string)fb_cfg_file()['db_path'] ?? '';
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return ($p !== '' && is_file($p) && (int)@filesize($p) > 0);
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}
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2026-09-28 20:34:37 +08:00
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/* ---------------- 站点设置(数据库覆盖 config.php) ----------------
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* 后台改的设置存在 settings 表,读取时覆盖 config.php 的同名项;
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* config.php 因此变成「出厂默认值」,部署后不必再手工改它。
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*/
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/** 允许在后台修改的设置键(白名单,防止改到 db_path 之类) */
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function fb_setting_keys() {
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return [
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'site_name', 'site_desc',
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2026-09-28 22:53:55 +08:00
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'footer.show_credit', 'footer.credit_url',
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'installed_at',
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2026-09-28 20:34:37 +08:00
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'attachment.storage',
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'upload.image_max_per_post', 'upload.image_max_bytes',
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'upload.video_max_per_post', 'upload.video_max_bytes',
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'upload.total_cap_bytes', 'upload.retention_days',
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'upload.upload_per_hour', 'upload.image_max_side',
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'oss.endpoint', 'oss.bucket', 'oss.instance_role', 'oss.enabled',
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'oss.credential_source', 'oss.access_key', 'oss.secret_key',
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'oss.domain', 'oss.visibility', 'oss.prefix', 'oss.url_scheme',
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2026-09-28 22:12:28 +08:00
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'oss.verify', 'oss.image_process', 'oss.use_internal_endpoint',
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2026-09-28 20:34:37 +08:00
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'moderation.enabled', 'moderation.close_mail_subject',
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'admin.password_hash',
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];
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}
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/**
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* 全部设置(扁平:'oss.bucket' => 值)。带进程内缓存;$reload=true 强制重读。
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* 与 fb_db() 之间可能互相调用,用 $loading 防止递归。
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*/
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function fb_settings_flat($reload = false) {
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static $flat = null;
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static $loading = false;
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if ($flat !== null && !$reload) { return $flat; }
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if ($loading) { return []; }
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2026-09-28 22:53:55 +08:00
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/* ★ 未安装时绝不读表:读表要先 fb_db(),那会就地建出一个空数据库文件,
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* 等于把「未安装」这个状态自己抹掉 —— 安装向导就再也进不去了。
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* fb_installed() 走纯文件配置、不碰库,可以安全地在这里调用。 */
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if (function_exists('fb_installed') && !fb_installed()) { return []; }
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2026-09-28 20:34:37 +08:00
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$loading = true;
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$out = [];
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try {
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$pdo = fb_db();
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$rows = $pdo->query('SELECT key, value FROM settings')->fetchAll();
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foreach ($rows as $r) {
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$k = (string)$r['key'];
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$v = json_decode((string)$r['value'], true);
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if (json_last_error() !== JSON_ERROR_NONE) { $v = (string)$r['value']; }
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$out[$k] = $v;
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}
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} catch (Throwable $e) {
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$out = [];
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}
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$loading = false;
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$flat = $out;
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return $flat;
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}
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/** 把扁平的 'a.b.c' => v 转成嵌套数组,供 fb_cfg 与文件配置合并 */
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function fb_setting_tree() {
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$tree = [];
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foreach (fb_settings_flat() as $k => $v) {
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$parts = explode('.', (string)$k);
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$cur =& $tree;
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foreach ($parts as $i => $p) {
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if ($i === count($parts) - 1) { $cur[$p] = $v; }
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else {
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if (!isset($cur[$p]) || !is_array($cur[$p])) { $cur[$p] = []; }
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$cur =& $cur[$p];
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}
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}
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unset($cur);
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}
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return $tree;
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}
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/** 读单个设置(未经白名单限制,仅用于内部读取) */
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function fb_setting($key, $default = null) {
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$flat = fb_settings_flat();
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return array_key_exists($key, $flat) ? $flat[$key] : $default;
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}
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/** 写单个设置 @return bool 是否成功(不在白名单里会失败) */
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function fb_set_setting($key, $value) {
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if (!in_array((string)$key, fb_setting_keys(), true)) { return false; }
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$pdo = fb_db();
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$st = $pdo->prepare('INSERT OR REPLACE INTO settings(key, value, updated_at) VALUES(?,?,?)');
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$st->execute([(string)$key, json_encode($value, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES), time()]);
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// 立刻失效:本进程内再读 fb_cfg 也要拿到新值(后台保存后同页要显示新状态)
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fb_settings_flat(true);
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$GLOBALS['__fb_cfg_stamp'] = ((int)$GLOBALS['__fb_cfg_stamp']) + 1;
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return true;
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}
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/** 删除单个设置(回落为 config.php 里的出厂值) @return bool */
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function fb_unset_setting($key) {
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if (!in_array((string)$key, fb_setting_keys(), true)) { return false; }
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$pdo = fb_db();
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$st = $pdo->prepare('DELETE FROM settings WHERE key = ?');
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$st->execute([(string)$key]);
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// 同样立刻失效,保证后续 fb_cfg 读到的是一致状态
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fb_settings_flat(true);
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$GLOBALS['__fb_cfg_stamp'] = ((int)$GLOBALS['__fb_cfg_stamp']) + 1;
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return true;
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}
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/* ---------------- 管理员登录 ---------------- */
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/** 后台会话的有效期(秒):超时自动退出 */
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function fb_admin_idle_ttl() {
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return 7200;
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}
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/** 已登录且在有效期内(每次访问续期) */
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function fb_admin_logged_in() {
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if (!fb_is_admin()) { return false; }
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$at = isset($_SESSION['fb_admin_at']) ? (int)$_SESSION['fb_admin_at'] : 0;
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if ($at <= 0 || (time() - $at) > fb_admin_idle_ttl()) {
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unset($_SESSION['fb_admin'], $_SESSION['fb_admin_at']);
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return false;
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}
|
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|
|
$_SESSION['fb_admin_at'] = time();
|
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|
|
return true;
|
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}
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|
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/** 置位登录态 */
|
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|
|
function fb_admin_login() {
|
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|
|
$_SESSION['fb_admin'] = 1;
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|
|
$_SESSION['fb_admin_at'] = time();
|
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|
|
|
|
@session_regenerate_id(true);
|
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|
|
}
|
|
|
|
|
|
|
2026-09-28 22:53:55 +08:00
|
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|
|
/** 安装向导会直接写成对的占位值;这些值一律视为「没设口令」 */
|
|
|
|
|
|
function fb_admin_password_placeholder() {
|
|
|
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|
|
return ['', 'CHANGE_ME_admin', 'CHANGE_ME', 'change_me', 'admin', 'password'];
|
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|
|
}
|
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|
|
/**
|
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|
|
* 口令当前存在哪 —— 用于在后台如实告诉管理员「口令保存在哪里、是否加密」。
|
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|
|
|
* ① 'db' :数据库 settings 表的 admin.password_hash,bcrypt 单向哈希(不可逆)
|
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|
|
|
* ② 'file' :config.php 的 admin_password 明文(仅安装向导之前的老部署会走到)
|
|
|
|
|
|
* ③ 'none' :尚未设置(或仍是出厂占位值)→ 后台拒绝登录,只能用安装向导设一个
|
|
|
|
|
|
*/
|
|
|
|
|
|
function fb_admin_password_source() {
|
|
|
|
|
|
if ((string)fb_setting('admin.password_hash', '') !== '') { return 'db'; }
|
|
|
|
|
|
$cfg = trim((string)fb_cfg('admin_password', ''));
|
|
|
|
|
|
if ($cfg === '' || in_array($cfg, fb_admin_password_placeholder(), true)) { return 'none'; }
|
|
|
|
|
|
return 'file';
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/** 是否已设置过可用口令(未设置时后台不可登录,且不提示"口令不正确"而是提示去安装) */
|
|
|
|
|
|
function fb_admin_password_is_set() {
|
|
|
|
|
|
return fb_admin_password_source() !== 'none';
|
|
|
|
|
|
}
|
|
|
|
|
|
|
2026-09-28 20:34:37 +08:00
|
|
|
|
/**
|
|
|
|
|
|
* 校验管理员口令。
|
2026-09-28 22:53:55 +08:00
|
|
|
|
* 后台改过口令后存的是 password_hash;没改过才回落到 config.php 的明文。
|
|
|
|
|
|
* ★ 出厂占位值(CHANGE_ME_admin 等)一律拒绝:否则 clone 下来没改配置的站点,
|
|
|
|
|
|
* 任何人都能用文档里公开的占位口令登进后台。
|
2026-09-28 20:34:37 +08:00
|
|
|
|
*/
|
|
|
|
|
|
function fb_admin_verify_password($pw) {
|
|
|
|
|
|
$pw = (string)$pw;
|
|
|
|
|
|
$hash = (string)fb_setting('admin.password_hash', '');
|
|
|
|
|
|
if ($hash !== '') { return password_verify($pw, $hash); }
|
|
|
|
|
|
$cfg = (string)fb_cfg('admin_password', '');
|
2026-09-28 22:53:55 +08:00
|
|
|
|
if ($cfg === '' || in_array($cfg, fb_admin_password_placeholder(), true)) { return false; }
|
|
|
|
|
|
return hash_equals($cfg, $pw);
|
2026-09-28 20:34:37 +08:00
|
|
|
|
}
|
|
|
|
|
|
|
2026-09-28 22:53:55 +08:00
|
|
|
|
/** 修改管理员口令(存 bcrypt 哈希到数据库,立即生效) */
|
2026-09-28 20:34:37 +08:00
|
|
|
|
function fb_admin_set_password($pw) {
|
|
|
|
|
|
return fb_set_setting('admin.password_hash', password_hash((string)$pw, PASSWORD_DEFAULT));
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/** 写一条操作日志 */
|
|
|
|
|
|
function fb_mod_log($action, $threadId = null, $detail = '') {
|
|
|
|
|
|
try {
|
|
|
|
|
|
$pdo = fb_db();
|
|
|
|
|
|
$st = $pdo->prepare('INSERT INTO mod_log(thread_id, action, detail, created_at, ip_hash) VALUES(?,?,?,?,?)');
|
|
|
|
|
|
$st->execute([$threadId ? (int)$threadId : null, (string)$action, (string)$detail, time(), fb_ip_hash()]);
|
|
|
|
|
|
} catch (Throwable $e) { /* 日志失败不影响主流程 */ }
|
|
|
|
|
|
}
|