feat: starter code for Response Filters

src/Appwrite/Utopia/Response.php

@@ -6,6 +6,8 @@ use Exception;
 use Utopia\Swoole\Response as SwooleResponse;
 use Swoole\Http\Response as SwooleHTTPResponse;
 use Appwrite\Database\Document;
+use Appwrite\Utopia\Response\Filter;
+use Appwrite\Utopia\Response\Filter\V06;
 use Appwrite\Utopia\Response\Model;
 use Appwrite\Utopia\Response\Model\None;
 use Appwrite\Utopia\Response\Model\Any;
@@ -112,6 +114,11 @@ class Response extends SwooleResponse
     const MODEL_DOMAIN = 'domain';
     const MODEL_DOMAIN_LIST = 'domainList';
 
+    /**
+     * @var Filter
+     */
+    private static $filter = null;
+
     /**
      * @var array
      */
@@ -329,4 +336,37 @@ class Response extends SwooleResponse
     {
         return $this->payload;
     }
+
+
+    /**
+     * Function to set a response filter
+     * 
+     * @param $filter the response filter to set
+     * 
+     * @return void
+     */
+    public static function setFilter(Filter $filter) 
+    {
+        self::$filter = $filter;
+    }
+
+    /**
+     * Return the currently set filter
+     * 
+     * @return Filter
+     */
+    public static function getFilter(): Filter 
+    {
+        return self::$filter;
+    }
+
+    /**
+     * Check if a filter has been set
+     * 
+     * @return bool
+     */
+    public static function isFilter(): bool 
+    {
+        return self::$filter != null;
+    }
 }

src/Appwrite/Utopia/Response/Filter.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Appwrite\Utopia\Response;
+
+abstract class Filter {
+
+    /**
+     * Parse the content to another format.
+     *
+     * @param array $content
+     *
+     * @return array
+     */
+    abstract function parse(array $content): array;
+    
+}

src/Appwrite/Utopia/Response/Filters/V06.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Appwrite\Utopia\Response\Filter;
+
+use Appwrite\Utopia\Response\Filter;
+
+class V06 extends Filter {
+    
+
+    // Convert 0.7 Data format to 0.6 format
+    public function parse(array $content): array {
+        return array();
+    }
+}