handle failed unserialize

Author: Stephan Wentz

src/Exception/UnserializeFailedException.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types = 1);
+
+/*
+ * This file is part of the brainbits blocking package.
+ *
+ * (c) brainbits GmbH (http://www.brainbits.net)
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Brainbits\Blocking\Exception;
+
+/**
+ * Unserialize failed exception.
+ */
+final class UnserializeFailedException extends RuntimeException
+{
+    /**
+     * @param mixed $input
+     */
+    public static function createFromInput($input): self
+    {
+        return new self("Unserialize failed: ".$input);
+    }
+}

src/Storage/FilesystemStorage.php

@@ -17,6 +17,7 @@
 use Brainbits\Blocking\Exception\DirectoryNotWritableException;
 use Brainbits\Blocking\Exception\FileNotWritableException;
 use Brainbits\Blocking\Exception\IOException;
+use Brainbits\Blocking\Exception\UnserializeFailedException;
 use Brainbits\Blocking\Identity\IdentityInterface;
 use DateTimeImmutable;
 
@@ -92,6 +93,10 @@ public function get(IdentityInterface $identifier): ?BlockInterface
         $content = file_get_contents($filename);
         $updatedAt = DateTimeImmutable::createFromFormat('U', (string) filemtime($filename));
         $block = unserialize($content);
+        if (!$block) {
+            throw UnserializeFailedException::createFromInput($content);
+        }
+
         $block->touch($updatedAt);
 
         return $block;