Added "defaultFileNameHashFunction" option

Author: Geolim4

lib/Phpfastcache/Config/ConfigurationOption.php

@@ -40,6 +40,11 @@ class ConfigurationOption extends ArrayObject
      */
     protected $defaultKeyHashFunction = 'md5';
 
+    /**
+     * @var string|Callable
+     */
+    protected $defaultFileNameHashFunction = 'md5';
+
     /**
      * @var int
      */
@@ -263,6 +268,28 @@ public function setDefaultKeyHashFunction($defaultKeyHashFunction)
         return $this;
     }
 
+    /**
+     * @return Callable|string
+     */
+    public function getDefaultFileNameHashFunction()
+    {
+        return $this->defaultFileNameHashFunction;
+    }
+
+    /**
+     * @param Callable|string $defaultKeyHashFunction
+     * @return ConfigurationOption
+     * @throws  PhpfastcacheInvalidConfigurationException
+     */
+    public function setDefaultFileNameHashFunction($defaultFileNameHashFunction)
+    {
+        if (!\function_exists($defaultFileNameHashFunction) || !\is_callable($defaultFileNameHashFunction)) {
+            throw new PhpfastcacheInvalidConfigurationException('defaultFileNameHashFunction must be a valid function name string');
+        }
+        $this->defaultFileNameHashFunction = $defaultFileNameHashFunction;
+        return $this;
+    }
+
     /**
      * @return int
      */
@@ -445,7 +472,7 @@ public function setCacheFileExtension(string $cacheFileExtension): self
         }
         if (!\in_array($cacheFileExtension, $safeFileExtensions, true)) {
             throw new PhpfastcacheInvalidConfigurationException(
-              "{$cacheFileExtension} is not a safe extension, currently allowed extension: " . \implode(', ', $safeFileExtensions)
+              "Extension \"{$cacheFileExtension}\" is not safe, currently allowed extension names: " . \implode(', ', $safeFileExtensions)
             );
         }
 

lib/Phpfastcache/Core/Pool/IO/IOHelperTrait.php

@@ -85,7 +85,7 @@ public function getPath($readonly = false): string
         $path_suffix = $securityKey . \DIRECTORY_SEPARATOR . $this->getDriverName();
         $full_path = Directory::getAbsolutePath($path . $path_suffix);
         $full_path_tmp = Directory::getAbsolutePath($tmp_dir . $path_suffix);
-        $full_path_hash = \md5($full_path);
+        $full_path_hash = $this->getConfig()->getDefaultFileNameHashFunction()($full_path);
 
         /**
          * In readonly mode we only attempt
@@ -172,7 +172,7 @@ protected function getFilePath($keyword, $skip = false): string
      */
     protected function encodeFilename($keyword): string
     {
-        return \md5($keyword);
+        return $this->getConfig()->getDefaultFileNameHashFunction()($keyword);
     }
 
     /**
@@ -289,7 +289,7 @@ protected function writefile($file, $data, $secureFileManipulation = false): boo
         $this->eventManager->dispatch('CacheWriteFileOnDisk', $this, $file, $secureFileManipulation);
 
         if ($secureFileManipulation) {
-            $tmpFilename = Directory::getAbsolutePath(\dirname($file) . '/tmp_' . \md5(
+            $tmpFilename = Directory::getAbsolutePath(\dirname($file) . '/tmp_' . $this->getConfig()->getDefaultFileNameHashFunction()(
                 \str_shuffle(\uniqid($this->getDriverName(), false))
                 . \str_shuffle(\uniqid($this->getDriverName(), false))
               ));