Add AddressBookRevokeAllSignatures method for revoking all signing keys of a contact

https://github.com/nosial/Socialbox-PHP/issues/73

src/Socialbox/Classes/StandardMethods/AddressBook/AddressBookRevokeAllSignatures.php

@@ -0,0 +1,58 @@
+<?php
+
+    namespace Socialbox\Classes\StandardMethods\AddressBook;
+
+    use Socialbox\Abstracts\Method;
+    use Socialbox\Enums\StandardError;
+    use Socialbox\Exceptions\DatabaseOperationException;
+    use Socialbox\Exceptions\Standard\MissingRpcArgumentException;
+    use Socialbox\Exceptions\Standard\StandardRpcException;
+    use Socialbox\Interfaces\SerializableInterface;
+    use Socialbox\Managers\ContactManager;
+    use Socialbox\Objects\ClientRequest;
+    use Socialbox\Objects\PeerAddress;
+    use Socialbox\Objects\RpcRequest;
+
+    class AddressBookRevokeAllSignatures extends Method
+    {
+        /**
+         * @inheritDoc
+         * @noinspection DuplicatedCode
+         */
+        public static function execute(ClientRequest $request, RpcRequest $rpcRequest): ?SerializableInterface
+        {
+            if(!$rpcRequest->containsParameter('peer'))
+            {
+                throw new MissingRpcArgumentException('peer');
+            }
+
+            $peerAddress = PeerAddress::fromAddress($rpcRequest->getParameter('peer'));
+
+            try
+            {
+                // Check if the contact already exists
+                $contact = ContactManager::getContact($request->getPeer(), $peerAddress);
+            }
+            catch (DatabaseOperationException $e)
+            {
+                throw new StandardRpcException('Failed to check contact state with calling peer', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+
+            if($contact === null)
+            {
+                return $rpcRequest->produceResponse(false);
+            }
+
+            try
+            {
+                ContactManager::removeAllContactSigningKeys($contact);
+            }
+            catch (DatabaseOperationException $e)
+            {
+                throw new StandardRpcException('Failed to remove all contact signatures', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+
+            // Return success
+            return $rpcRequest->produceResponse(true);
+        }
+    }