404-solution / includes / php / FileSync.php

FileSync.php in 404 Solution 4.1.19, at includes/php/FileSync.php

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1	<?php
2
3
4	if (!defined('ABSPATH')) {
5	exit;
6	}
7
8	class ABJ_404_Solution_FileSync {
9
10	/** @var self\|null */
11	private static $instance = null;
12
13	/** @return self */
14	public static function getInstance(): self {
15	if (self::$instance == null) {
16	self::$instance = new ABJ_404_Solution_FileSync();
17	}
18
19	return self::$instance;
20	}
21
22	/**
23	* @param string $key
24	* @return string
25	*/
26	function getSyncFilePath(string $key): string {
27	$filePath = abj404_getUploadsDir() . 'SYNC_FILE_' . $key . '.txt';
28	return $filePath;
29	}
30
31	/**
32	* @param string $key
33	* @return string
34	*/
35	function getOwnerFromFile(string $key): string {
36	$filePath = $this->getSyncFilePath($key);
37	$fileUtils = abj_service('functions');
38
39	// Fixed: TOCTOU race condition - catch exception instead of check-then-read
40	try {
41	$contents = $fileUtils->readFileContents($filePath, false);
42	return $contents;
43	} catch (Exception $e) {
44	// File doesn't exist or can't be read - return empty string
45	return "";
46	}
47	}
48
49	/**
50	* @param string $key
51	* @param string $uniqueID
52	* @return void
53	*/
54	function writeOwnerToFile(string $key, string $uniqueID): void {
55	$filePath = $this->getSyncFilePath($key);
56
57	// Fixed: Check return value to handle write failures (disk full, permissions, etc.)
58	$result = @file_put_contents($filePath, $uniqueID, LOCK_EX);
59
60	if ($result === false) {
61	throw new Exception("Failed to write lock file: " . $filePath);
62	}
63	}
64
65	/**
66	* @param string $uniqueID
67	* @param string $key
68	* @return void
69	*/
70	function releaseLock(string $uniqueID, string $key): void {
71	$filePath = $this->getSyncFilePath($key);
72	$fileUtils = abj_service('functions');
73	$fileUtils->safeUnlink($filePath);
74	}
75
76	}
77