Add Method abstract class with session handling

src/Socialbox/Abstracts/Method.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace Socialbox\Abstracts;
+
+use Socialbox\Enums\StandardError;
+use Socialbox\Exceptions\DatabaseOperationException;
+use Socialbox\Exceptions\StandardException;
+use Socialbox\Interfaces\SerializableInterface;
+use Socialbox\Managers\SessionManager;
+use Socialbox\Objects\ClientRequest;
+use Socialbox\Objects\RpcRequest;
+use Socialbox\Objects\SessionRecord;
+
+abstract class Method
+{
+    /**
+     * Executes the method and returns RpcResponse/RpcError which implements SerializableInterface
+     *
+     * @param ClientRequest $request The full client request object, used to identify the client & it's requests
+     * @param RpcRequest $rpcRequest The selected RPC request for the method to handle
+     * @return SerializableInterface|null Returns RpcResponse/RpcError on success, null if the request is a notification
+     * @throws StandardException If a standard exception is thrown, it will be handled by the engine.
+     */
+    public static abstract function execute(ClientRequest $request, RpcRequest $rpcRequest): ?SerializableInterface;
+
+    /**
+     * @param ClientRequest $request The client request object
+     * @return SessionRecord|null Returns null if the client has not provided a Session UUID
+     * @throws StandardException Thrown if standard exceptions are to be thrown regarding this
+     */
+    protected static function getSession(ClientRequest $request): ?SessionRecord
+    {
+        if($request->getSessionUuid() === null)
+        {
+            return null;
+        }
+
+        try
+        {
+            if(!SessionManager::sessionExists($request->getSessionUuid()))
+            {
+                throw new StandardException(sprintf("The requested session %s was not found", $request->getSessionUuid()), StandardError::SESSION_NOT_FOUND);
+            }
+
+            return SessionManager::getSession($request->getSessionUuid());
+        }
+        catch(DatabaseOperationException $e)
+        {
+            throw new StandardException("There was an error while retrieving the session from the server", StandardError::INTERNAL_SERVER_ERROR);
+        }
+    }
+}

src/Socialbox/Interfaces/SerializableInterface.php

@@ -4,17 +4,17 @@ namespace Socialbox\Interfaces;
 
 interface SerializableInterface
 {
-    /**
-     * Serializes the object to an array.
-     *
-     * @return array
-     */
-    public function toArray(): array;
-
     /**
      * Constructs the object from an array of data.
      *
      * @param array $data The data to construct the object from.
      */
     public static function fromArray(array $data): object;
+
+    /**
+     * Serializes the object to an array.
+     *
+     * @return array
+     */
+    public function toArray(): array;
 }