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system/HotReloader/DirectoryHasher.php

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+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\HotReloader;
+
+use CodeIgniter\Exceptions\FrameworkException;
+use Config\Toolbar;
+use FilesystemIterator;
+use RecursiveDirectoryIterator;
+use RecursiveIteratorIterator;
+
+/**
+ * @internal
+ * @see \CodeIgniter\HotReloader\DirectoryHasherTest
+ */
+final class DirectoryHasher
+{
+    /**
+     * Generates an md5 value of all directories that are watched by the
+     * Hot Reloader, as defined in the Config\Toolbar.
+     *
+     * This is the current app fingerprint.
+     */
+    public function hash(): string
+    {
+        return md5(implode('', $this->hashApp()));
+    }
+
+    /**
+     * Generates an array of md5 hashes for all directories that are
+     * watched by the Hot Reloader, as defined in the Config\Toolbar.
+     */
+    public function hashApp(): array
+    {
+        $hashes = [];
+
+        $watchedDirectories = config(Toolbar::class)->watchedDirectories;
+
+        foreach ($watchedDirectories as $directory) {
+            if (is_dir(ROOTPATH . $directory)) {
+                $hashes[$directory] = $this->hashDirectory(ROOTPATH . $directory);
+            }
+        }
+
+        return array_unique(array_filter($hashes));
+    }
+
+    /**
+     * Generates an md5 hash of a given directory and all of its files
+     * that match the watched extensions defined in Config\Toolbar.
+     */
+    public function hashDirectory(string $path): string
+    {
+        if (! is_dir($path)) {
+            throw FrameworkException::forInvalidDirectory($path);
+        }
+
+        $directory = new RecursiveDirectoryIterator($path, FilesystemIterator::SKIP_DOTS);
+        $filter    = new IteratorFilter($directory);
+        $iterator  = new RecursiveIteratorIterator($filter);
+
+        $hashes = [];
+
+        foreach ($iterator as $file) {
+            if ($file->isFile()) {
+                $hashes[] = md5_file($file->getRealPath());
+            }
+        }
+
+        return md5(implode('', $hashes));
+    }
+}