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<?php
class FileShare {
private $db;
private $settings;
private $upload_dir;
private $cleanup_interval = 3600; // 清理间隔：1小时
public function __construct() {
$this->settings = new Settings();
$this->db = new SQLite3($this->settings->getSetting('db_path'));
$this->upload_dir = __DIR__ . '/uploads/files/';
// 确保上传目录存在并创建必要的保护文件
$this->initializeUploadDirectory();
// 检查是否需要清理过期文件
$this->checkAndCleanup();
}
// 初始化上传目录和保护文件
private function initializeUploadDirectory() {
// 创建上传目录
if (!is_dir($this->upload_dir)) {
if (!mkdir($this->upload_dir, 0755, true)) {
throw new Exception('无法创建上传目录，请检查权限');
}
// 创建 .htaccess 文件来保护上传目录
$htaccess = $this->upload_dir . '.htaccess';
if (!file_exists($htaccess)) {
$htaccess_content = "Options -Indexes\n";
$htaccess_content .= "DirectoryIndex 403.html\n";
$htaccess_content .= "AddType text/plain .php\n";
$htaccess_content .= "AddType text/plain .html\n";
$htaccess_content .= "AddType text/plain .htm\n";
$htaccess_content .= "AddType text/plain .htaccess\n";
file_put_contents($htaccess, $htaccess_content);
}
// 创建 index.html 文件来防止目录列表
$index_html = $this->upload_dir . 'index.html';
if (!file_exists($index_html)) {
file_put_contents($index_html, '<!DOCTYPE html><html><head><title>403 Forbidden</title></head><body><h1>403 Forbidden</h1></body></html>');
}
// 创建 403.html 文件
$forbidden_page = $this->upload_dir . '403.html';
if (!file_exists($forbidden_page)) {
file_put_contents($forbidden_page, '<!DOCTYPE html><html><head><title>403 Forbidden</title></head><body><h1>403 Forbidden</h1><p>Access to this directory is forbidden.</p></body></html>');
}
}
// 设置目录权限
chmod($this->upload_dir, 0755);
}
// 检查并清理过期文件
private function checkAndCleanup() {
$lastCleanup = $this->settings->getSetting('last_cleanup', 0);
// 使用中国时间
date_default_timezone_set('Asia/Shanghai');
$currentTime = time();
if ($currentTime - $lastCleanup > $this->cleanup_interval) {
$this->settings->setSetting('last_cleanup', $currentTime);
$stmt = $this->db->prepare('
SELECT code, type, filepath
FROM files
WHERE expires_at < :current_time
OR (max_downloads > 0 AND current_downloads >= max_downloads)
');
$stmt->bindValue(':current_time', $currentTime, SQLITE3_INTEGER);
$result = $stmt->execute();
// 删除过期的文件和记录
while ($row = $result->fetchArray(SQLITE3_ASSOC)) {
if ($row['type'] === 'file' && $row['filepath'] && file_exists($row['filepath'])) {
unlink($row['filepath']);
}
$deleteStmt = $this->db->prepare('DELETE FROM files WHERE code = :code');
$deleteStmt->bindValue(':code', $row['code'], SQLITE3_TEXT);
$deleteStmt->execute();
}
// 清理空目录
$this->cleanEmptyDirectories($this->upload_dir);
}
}
// 清理空目录
private function cleanEmptyDirectories($dir) {
if (!is_dir($dir)) {
return;
}
$files = scandir($dir);
foreach ($files as $file) {
if ($file === '.' || $file === '..' || $file === '.htaccess' ||
$file === 'index.html' || $file === '403.html') {
continue;
}
$path = $dir . '/' . $file;
if (is_dir($path)) {
$this->cleanEmptyDirectories($path);
// 如果目录为空（只包含 . 和 ..），则删除
$subFiles = scandir($path);
if (count($subFiles) <= 2) { // 只有 . 和 ..
rmdir($path);
}
}
}
}
// 生成随机提取码
private function generateCode($length = 6) {
$chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$code = '';
for ($i = 0; $i < $length; $i++) {
$code .= $chars[random_int(0, strlen($chars) - 1)];
}
return $code;
}
// 保存文件或文本
public function save($data) {
$this->checkAndCleanup();
$code = $this->generateCode();
// 使用中国时间
date_default_timezone_set('Asia/Shanghai');
$created_at = time(); // 当前中国时间
$expires_at = $created_at + intval($data['expire_time']); // 过期时间也是中国时间
if (isset($_FILES['file'])) {
// 处理文件上传
$file = $_FILES['file'];
$filename = $file['name'];
$filepath = $this->upload_dir . uniqid() . '_' . bin2hex(random_bytes(4)) . '_' . $filename;
if (!move_uploaded_file($file['tmp_name'], $filepath)) {
throw new Exception('文件上传失败');
}
$type = 'file';
$content = null;
} else {
// 处理文本内容
$filename = null;
$filepath = null;
$type = 'text';
$content = $data['content'];
}
$stmt = $this->db->prepare('
INSERT INTO files (code, filename, filepath, content, type, created_at, expires_at, max_downloads)
VALUES (:code, :filename, :filepath, :content, :type, :created_at, :expires_at, :max_downloads)
');
$stmt->bindValue(':code', $code, SQLITE3_TEXT);
$stmt->bindValue(':filename', $filename, SQLITE3_TEXT);
$stmt->bindValue(':filepath', $filepath, SQLITE3_TEXT);
$stmt->bindValue(':content', $content, SQLITE3_TEXT);
$stmt->bindValue(':type', $type, SQLITE3_TEXT);
$stmt->bindValue(':created_at', $created_at, SQLITE3_INTEGER);
$stmt->bindValue(':expires_at', $expires_at, SQLITE3_INTEGER);
$stmt->bindValue(':max_downloads', intval($data['max_downloads']), SQLITE3_INTEGER);
if ($stmt->execute()) {
return $code;
}
throw new Exception('保存失败');
}
// 获取文件或文本
public function get($code) {
$this->checkAndCleanup();
$stmt = $this->db->prepare('SELECT * FROM files WHERE code = :code');
$stmt->bindValue(':code', $code, SQLITE3_TEXT);
$result = $stmt->execute();
if ($row = $result->fetchArray(SQLITE3_ASSOC)) {
// 使用中国时间进行比较
date_default_timezone_set('Asia/Shanghai');
if (time() > $row['expires_at']) {
$this->delete($code);
return null;
}
// 检查下载次数
if ($row['max_downloads'] > 0 && $row['current_downloads'] >= $row['max_downloads']) {
$this->delete($code);
return null;
}
// 更新下载次数
$stmt = $this->db->prepare('
UPDATE files
SET current_downloads = current_downloads + 1
WHERE code = :code
');
$stmt->bindValue(':code', $code, SQLITE3_TEXT);
$stmt->execute();
// 返回更多文件信息
return [
'type' => $row['type'],
'content' => $row['content'],
'filename' => $row['filename'],
'filepath' => $row['filepath'],
'current_downloads' => $row['current_downloads'],
'max_downloads' => $row['max_downloads'],
'expires_at' => $row['expires_at']
];
}
return null;
}
// 删除文件或文本
private function delete($code) {
$stmt = $this->db->prepare('SELECT * FROM files WHERE code = :code');
$stmt->bindValue(':code', $code, SQLITE3_TEXT);
$result = $stmt->execute();
if ($row = $result->fetchArray(SQLITE3_ASSOC)) {
if ($row['type'] === 'file' && $row['filepath'] && file_exists($row['filepath'])) {
unlink($row['filepath']);
}
}
$stmt = $this->db->prepare('DELETE FROM files WHERE code = :code');
$stmt->bindValue(':code', $code, SQLITE3_TEXT);
$stmt->execute();
}
}
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