src/Socialbox/Classes/StandardMethods/EncryptionChannel/EncryptionChannelSend.php

@@ -0,0 +1,237 @@
+<?php
+
+    namespace Socialbox\Classes\StandardMethods\EncryptionChannel;
+
+    use Exception;
+    use Socialbox\Abstracts\Method;
+    use Socialbox\Classes\Cryptography;
+    use Socialbox\Classes\Validator;
+    use Socialbox\Enums\StandardError;
+    use Socialbox\Enums\Status\EncryptionChannelStatus;
+    use Socialbox\Exceptions\DatabaseOperationException;
+    use Socialbox\Exceptions\RpcException;
+    use Socialbox\Exceptions\Standard\InvalidRpcArgumentException;
+    use Socialbox\Exceptions\Standard\MissingRpcArgumentException;
+    use Socialbox\Exceptions\Standard\StandardRpcException;
+    use Socialbox\Interfaces\SerializableInterface;
+    use Socialbox\Managers\EncryptionChannelManager;
+    use Socialbox\Objects\ClientRequest;
+    use Socialbox\Objects\RpcRequest;
+    use Socialbox\Socialbox;
+    use Symfony\Component\Uid\Uuid;
+
+    class EncryptionChannelSend extends Method
+    {
+
+        /**
+         * @inheritDoc
+         */
+        public static function execute(ClientRequest $request, RpcRequest $rpcRequest): ?SerializableInterface
+        {
+            if(!$rpcRequest->containsParameter('channel_uuid'))
+            {
+                throw new MissingRpcArgumentException('channel_uuid');
+            }
+            elseif(!Validator::validateUuid($rpcRequest->getParameter('channel_uuid')))
+            {
+                throw new InvalidRpcArgumentException('channel_uuid', 'The given channel uuid is not a valid UUID V4');
+            }
+
+            try
+            {
+                if ($request->isExternal())
+                {
+                    return self::executeExternal($request, $rpcRequest);
+                }
+            }
+            catch (DatabaseOperationException $e)
+            {
+                throw new StandardRpcException('An error occurred while checking the request type', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+
+            return self::executeInternal($request, $rpcRequest);
+        }
+
+        /**
+         * @param ClientRequest $request
+         * @param RpcRequest $rpcRequest
+         * @return SerializableInterface
+         * @throws StandardRpcException
+         */
+        private static function executeInternal(ClientRequest $request, RpcRequest $rpcRequest): SerializableInterface
+        {
+            try
+            {
+                $channelUuid = $rpcRequest->getParameter('channel_uuid');
+                $encryptionChannel = EncryptionChannelManager::getChannel($channelUuid);
+            }
+            catch(DatabaseOperationException $e)
+            {
+                throw new StandardRpcException('Failed to retrieve the encryption channel', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+
+            if($encryptionChannel === null)
+            {
+                return $rpcRequest->produceError(StandardError::NOT_FOUND, 'The encryption channel does not exist');
+            }
+
+            try
+            {
+                $requestingPeer = $request->getPeer();
+            }
+            catch (DatabaseOperationException $e)
+            {
+                throw new StandardRpcException('Failed to retrieve the peer', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+
+            if($requestingPeer === null)
+            {
+                return $rpcRequest->produceError(StandardError::UNAUTHORIZED, 'The peer is not authorized');
+            }
+
+            if(!$encryptionChannel->isParticipant($requestingPeer->getAddress()))
+            {
+                return $rpcRequest->produceError(StandardError::UNAUTHORIZED, 'The encryption channel is not accessible');
+            }
+            elseif($encryptionChannel->getStatus() !== EncryptionChannelStatus::OPENED)
+            {
+                return $rpcRequest->produceError(StandardError::FORBIDDEN, 'The encryption channel is not opened');
+            }
+
+            if(!$rpcRequest->containsParameter('checksum'))
+            {
+                throw new MissingRpcArgumentException('checksum');
+            }
+            elseif(!Cryptography::validateSha512($rpcRequest->getParameter('checksum')))
+            {
+                throw new InvalidRpcArgumentException('checksum', 'The given checksum is not a valid SHA-512 checksum');
+            }
+
+            if(!$rpcRequest->containsParameter('data'))
+            {
+                throw new MissingRpcArgumentException('data');
+            }
+
+            try
+            {
+                $messageUuid = Uuid::v4()->toRfc4122();
+                $messageTimestamp = time();
+
+                EncryptionChannelManager::sendMessage(
+                    channelUuid: $channelUuid,
+                    recipient: $encryptionChannel->determineRecipient($requestingPeer->getAddress()),
+                    checksum: $rpcRequest->getParameter('checksum'),
+                    data: $rpcRequest->getParameter('data'),
+                    messageUuid: $messageUuid,
+                    messageTimestamp: $messageTimestamp
+                );
+            }
+            catch(DatabaseOperationException $e)
+            {
+                throw new StandardRpcException('Failed to send the message', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+
+            if($encryptionChannel->determineReceiver($requestingPeer->getAddress())->isExternal())
+            {
+                try
+                {
+                    $rpcClient = Socialbox::getExternalSession($encryptionChannel->determineReceiver($requestingPeer->getAddress())->getDomain());
+                    $rpcClient->encryptionChannelSend(
+                        channelUuid: $rpcRequest->getParameter('channel_uuid'),
+                        checksum: $rpcRequest->getParameter('checksum'),
+                        data: $rpcRequest->getParameter('data'),
+                        identifiedAs: $requestingPeer->getAddress(),
+                        messageUuid: $messageUuid,
+                        timestamp: $messageTimestamp
+                    );
+                }
+                catch(Exception $e)
+                {
+                    if($e instanceof RpcException)
+                    {
+                        throw StandardRpcException::fromRpcException($e);
+                    }
+
+                    throw new StandardRpcException('There was an error while trying to notify the external server of the encryption channel', StandardError::INTERNAL_SERVER_ERROR, $e);
+                }
+            }
+
+            return $rpcRequest->produceResponse();
+        }
+
+        /**
+         * @param ClientRequest $request
+         * @param RpcRequest $rpcRequest
+         * @return SerializableInterface
+         * @throws StandardRpcException
+         */
+        private static function executeExternal(ClientRequest $request, RpcRequest $rpcRequest): SerializableInterface
+        {
+            if($request->getIdentifyAs() === null)
+            {
+                return $rpcRequest->produceError(StandardError::BAD_REQUEST, 'The IdentifyAs header is required');
+            }
+
+            try
+            {
+                $channelUuid = $rpcRequest->getParameter('channel_uuid');
+                $encryptionChannel = EncryptionChannelManager::getChannel($channelUuid);
+            }
+            catch(DatabaseOperationException $e)
+            {
+                throw new StandardRpcException('Failed to retrieve the encryption channel', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+
+            if($encryptionChannel === null)
+            {
+                return $rpcRequest->produceError(StandardError::NOT_FOUND, 'The encryption channel does not exist');
+            }
+            elseif(!$encryptionChannel->isParticipant($request->getIdentifyAs()))
+            {
+                return $rpcRequest->produceError(StandardError::UNAUTHORIZED, 'The encryption channel is not accessible');
+            }
+
+            if(!$rpcRequest->containsParameter('checksum'))
+            {
+                throw new MissingRpcArgumentException('checksum');
+            }
+
+            if(!$rpcRequest->containsParameter('data'))
+            {
+                throw new MissingRpcArgumentException('data');
+            }
+
+            if(!$rpcRequest->containsParameter('message_uuid'))
+            {
+                throw new MissingRpcArgumentException('message_uuid');
+            }
+
+            if(!$rpcRequest->containsParameter('timestamp'))
+            {
+                throw new MissingRpcArgumentException('timestamp');
+            }
+            elseif(!is_int($rpcRequest->getParameter('timestamp')))
+            {
+                throw new InvalidRpcArgumentException('timestamp', 'The given timestamp must be type integer');
+            }
+
+            try
+            {
+                EncryptionChannelManager::sendMessage(
+                    channelUuid: $channelUuid,
+                    recipient: $encryptionChannel->determineRecipient($request->getIdentifyAs()),
+                    checksum: $rpcRequest->getParameter('checksum'),
+                    data: $rpcRequest->getParameter('data'),
+                    messageUuid: $rpcRequest->getParameter('message_uuid'),
+                    messageTimestamp: (int)$rpcRequest->getParameter('timestamp')
+                );
+            }
+            catch(DatabaseOperationException $e)
+            {
+                throw new StandardRpcException('Failed to send the message', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+            
+
+            return $rpcRequest->produceResponse(true);
+        }
+    }