99 lines
4.0 KiB
PHP
99 lines
4.0 KiB
PHP
<?php
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/**
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* STEP 查看器 - 上传接口（PHP 版，虚拟主机可用）
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* 接收原始字节流 + X-Filename 头，加密存储为 uploads/xxx.enc
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* 生产环境请修改 SECRET！
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*/
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header('Content-Type: application/json; charset=utf-8');
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$SECRET = '7175a8598ff7fa1c182f57f0c750e4f8';
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$MAX_SIZE = 500 * 1024 * 1024;
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// 私有目录：Web 目录外的绝对路径，模型只存这里，web 目录里根本没有模型文件可下载。
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// 群晖 File Station 在 web 目录外建 /volume1/stepviewer_private 并给 http 用户组读写权限；
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// 路径不同就改成你的实际路径。
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$PRIVATE_DIR = '/volume1/stepviewer_private';
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function json_out($code, $obj) {
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http_response_code($code);
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echo json_encode($obj, JSON_UNESCAPED_UNICODE);
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exit;
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}
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if ($_SERVER['REQUEST_METHOD'] !== 'POST') json_out(405, ['error' => 'method not allowed']);
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$len = (int)($_SERVER['CONTENT_LENGTH'] ?? 0);
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if ($len <= 0) json_out(400, ['error' => 'empty body']);
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if ($len > $MAX_SIZE) json_out(413, ['error' => 'file too large (max 500MB)']);
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$raw = urldecode($_SERVER['HTTP_X_FILENAME'] ?? 'model.step');
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$base = basename($raw);
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$safe = preg_replace('/[^\w.\-\x{4e00}-\x{9fff}]/u', '_', $base);
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if (!$safe || !preg_match('/\.(step|stp)$/i', $safe)) $safe .= '.stp';
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$stem = pathinfo($safe, PATHINFO_FILENAME);
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$ext = pathinfo($safe, PATHINFO_EXTENSION);
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$name = $stem . '_' . substr(bin2hex(random_bytes(4)), 0, 8) . '.' . $ext;
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$data = file_get_contents('php://input');
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if ($data === false || strlen($data) !== $len) json_out(400, ['error' => 'incomplete upload']);
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// 客户端可选 gzip 压缩上传（STEP 文本约可压到 1/6，节省带宽）
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if (($_SERVER['HTTP_X_ENCODING'] ?? '') === 'gzip') {
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$dec = gzdecode($data);
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if ($dec === false) json_out(400, ['error' => 'bad gzip body']);
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if (strlen($dec) > $MAX_SIZE) json_out(413, ['error' => 'file too large (max 500MB)']);
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$data = $dec;
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}
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// 存储层也压缩：先 gzip 再加密，磁盘占用约 1/6（读取端靠 gzip 魔数自动识别）
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$rawSize = strlen($data);
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$data = gzencode($data, 6);
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if ($data === false) json_out(500, ['error' => 'gzip failed']);
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$dir = $PRIVATE_DIR !== '' ? $PRIVATE_DIR : (__DIR__ . '/../uploads');
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if (!is_dir($dir)) @mkdir($dir, 0755, true);
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if (!is_dir($dir)) json_out(500, ['error' => 'upload dir not writable']);
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$nonce = random_bytes(16);
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$key = hash('sha256', $SECRET . $nonce, true);
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$enc = '';
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for ($i = 0; $i < strlen($data); $i++) {
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$enc .= $data[$i] ^ $key[$i % strlen($key)];
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}
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file_put_contents($dir . '/' . $name . '.enc', $nonce . $enc);
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// 私有目录模式下返回裸文件名：嵌入链接就是 ?file=xxx.enc，读取端按 basename 在私有目录找
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$entryPath = ($PRIVATE_DIR !== '' ? '' : 'uploads/') . $name . '.enc';
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// 记入首页数模库（入口目录的 library.json，2D/3D 共享）；库写失败不影响上传本身
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try {
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add_to_library($entryPath, $safe, '3d');
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} catch (Throwable $e) { /* 忽略 */ }
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json_out(200, ['path' => $entryPath, 'size' => $rawSize]);
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/**
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* 把刚上传的文件追加进首页数模库（../../library.json）：
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* 同路径已有记录就刷新名称和时间，否则插到最前。
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*/
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function add_to_library($path, $name, $type) {
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$libFile = dirname(__DIR__, 2) . '/library.json';
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$records = [];
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if (is_file($libFile)) {
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$old = json_decode((string)file_get_contents($libFile), true);
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if (is_array($old) && isset($old['records']) && is_array($old['records'])) $records = $old['records'];
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}
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$found = false;
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foreach ($records as $i => $rec) {
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if (isset($rec['path']) && $rec['path'] === $path) {
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$records[$i]['name'] = $name;
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$records[$i]['time'] = time();
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$found = true;
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break;
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}
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}
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if (!$found) {
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array_unshift($records, ['path' => $path, 'name' => $name, 'type' => $type, 'note' => '', 'time' => time()]);
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}
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@file_put_contents($libFile, json_encode(['records' => $records], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES), LOCK_EX);
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}
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