111 lines
3.5 KiB
PHP
111 lines
3.5 KiB
PHP
<?php
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/**
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* TCP Intermediate stream wrapper.
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*
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* This file is part of MadelineProto.
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* MadelineProto is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
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* MadelineProto is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Affero General Public License for more details.
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* You should have received a copy of the GNU General Public License along with MadelineProto.
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* If not, see <http://www.gnu.org/licenses/>.
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*
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* @author Daniil Gentili <daniil@daniil.it>
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* @copyright 2016-2020 Daniil Gentili <daniil@daniil.it>
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* @license https://opensource.org/licenses/AGPL-3.0 AGPLv3
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*
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* @link https://docs.madelineproto.xyz MadelineProto documentation
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*/
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namespace danog\MadelineProto\Stream\MTProtoTransport;
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use Amp\Promise;
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use Amp\Socket\EncryptableSocket;
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use danog\MadelineProto\Stream\Async\BufferedStream;
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use danog\MadelineProto\Stream\BufferedStreamInterface;
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use danog\MadelineProto\Stream\ConnectionContext;
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use danog\MadelineProto\Stream\MTProtoBufferInterface;
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use danog\MadelineProto\Stream\RawStreamInterface;
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/**
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* TCP Intermediate stream wrapper.
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*
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* Manages obfuscated2 encryption/decryption
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*
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* @author Daniil Gentili <daniil@daniil.it>
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*/
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class IntermediatePaddedStream implements BufferedStreamInterface, MTProtoBufferInterface
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{
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use BufferedStream;
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private $stream;
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/**
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* Connect to stream.
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*
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* @param ConnectionContext $ctx The connection context
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*
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* @return \Generator
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*/
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public function connect(ConnectionContext $ctx, string $header = ''): \Generator
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{
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$this->stream = (yield from $ctx->getStream(\str_repeat(\chr(221), 4).$header));
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}
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/**
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* Async close.
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*
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* @return Promise
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*/
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public function disconnect()
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{
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return $this->stream->disconnect();
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}
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/**
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* Get write buffer asynchronously.
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*
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* @param int $length Length of data that is going to be written to the write buffer
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*
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* @return \Generator
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*/
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public function getWriteBufferGenerator(int $length, string $append = ''): \Generator
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{
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$padding_length = \danog\MadelineProto\Tools::randomInt($modulus = 16);
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$buffer = yield $this->stream->getWriteBuffer(4 + $length + $padding_length, $append.\danog\MadelineProto\Tools::random($padding_length));
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yield $buffer->bufferWrite(\pack('V', $padding_length + $length));
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return $buffer;
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}
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/**
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* Get read buffer asynchronously.
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*
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* @param int $length Length of payload, as detected by this layer
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*
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* @return \Generator
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*/
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public function getReadBufferGenerator(&$length): \Generator
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{
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$buffer = yield $this->stream->getReadBuffer($l);
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$length = \unpack('V', yield $buffer->bufferRead(4))[1];
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return $buffer;
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}
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/**
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* {@inheritdoc}
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*
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* @return EncryptableSocket
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*/
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public function getSocket(): EncryptableSocket
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{
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return $this->stream->getSocket();
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}
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/**
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* {@inheritDoc}
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*
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* @return RawStreamInterface
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*/
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public function getStream(): RawStreamInterface
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{
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return $this->stream;
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}
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public static function getName(): string
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{
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return __CLASS__;
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}
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}
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