Added SettingsGetSigningKey as a standard method

src/Socialbox/Classes/StandardMethods/SettingsGetSigningKey.php

@@ -0,0 +1,43 @@
+<?php
+
+    namespace Socialbox\Classes\StandardMethods;
+
+    use Socialbox\Abstracts\Method;
+    use Socialbox\Enums\StandardError;
+    use Socialbox\Exceptions\DatabaseOperationException;
+    use Socialbox\Exceptions\StandardException;
+    use Socialbox\Interfaces\SerializableInterface;
+    use Socialbox\Managers\SigningKeysManager;
+    use Socialbox\Objects\ClientRequest;
+    use Socialbox\Objects\RpcRequest;
+
+    class SettingsGetSigningKey extends Method
+    {
+        /**
+         * @inheritDoc
+         */
+        public static function execute(ClientRequest $request, RpcRequest $rpcRequest): ?SerializableInterface
+        {
+            if(!$rpcRequest->containsParameter('uuid') && $rpcRequest->getParameter('uuid') !== null)
+            {
+                return $rpcRequest->produceError(StandardError::RPC_INVALID_ARGUMENTS, "Missing 'uuid' parameter");
+            }
+
+            try
+            {
+                $key = SigningKeysManager::getSigningKey($request->getPeer()->getUuid(), $rpcRequest->getParameter('uuid'));
+            }
+            catch (DatabaseOperationException $e)
+            {
+                throw new StandardException('Failed to get the signing keys', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+
+            if($key === null)
+            {
+                return $rpcRequest->produceError(StandardError::NOT_FOUND, 'The signing key does not exist');
+            }
+
+            // Return the signing key
+            return $rpcRequest->produceResponse($key->toStandard());
+        }
+    }