76 lines
1.9 KiB
PHP
76 lines
1.9 KiB
PHP
<?php
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require_once __DIR__ . '/_helpers.php';
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header('Content-Type: application/json');
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send_security_headers();
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if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') { exit; }
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if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
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http_response_code(405);
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echo json_encode(['error' => 'Method not allowed']);
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exit;
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}
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verify_origin();
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if (!check_rate_limit('shorten', 20, 3600)) {
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http_response_code(429);
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echo json_encode(['error' => 'Rate limit exceeded']);
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exit;
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}
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$dbFile = __DIR__ . '/../data/urls.json';
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$rawInput = file_get_contents('php://input');
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$input = is_string($rawInput) ? json_decode($rawInput, true) : null;
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$hash = is_array($input) && isset($input['hash']) && is_string($input['hash']) ? $input['hash'] : '';
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if (empty($hash) || strlen($hash) > 500 || !preg_match('/^[a-zA-Z0-9%+_=&.-]{1,500}$/', $hash)) {
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http_response_code(400);
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echo json_encode(['error' => 'Invalid data']);
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exit;
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}
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$secret = get_hmac_secret();
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[$fp, $urls] = read_json_locked($dbFile);
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if (!is_array($urls)) {
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$urls = [];
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}
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// Check if this hash already exists
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foreach ($urls as $code => $data) {
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$stored_hash = is_array($data) ? ($data['h'] ?? null) : $data;
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if (!is_string($stored_hash)) {
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continue;
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}
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if ($stored_hash === $hash) {
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flock($fp, LOCK_UN);
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fclose($fp);
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echo json_encode(['code' => $code]);
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exit;
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}
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}
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// Generate short code (6 chars)
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function generateCode(int $length = 6): string {
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$chars = 'abcdefghijkmnpqrstuvwxyz23456789';
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$code = '';
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for ($i = 0; $i < $length; $i++) {
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$code .= $chars[random_int(0, strlen($chars) - 1)];
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}
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return $code;
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}
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$code = generateCode();
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while (isset($urls[$code])) {
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$code = generateCode();
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}
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$signature = hash_hmac('sha256', $hash, $secret);
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$urls[$code] = ['h' => $hash, 's' => $signature];
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write_json_locked($fp, $urls);
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echo json_encode(['code' => $code]);
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