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<?php |
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namespace kalanis\RemoteRequest\Protocols\Fsp; |
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use kalanis\RemoteRequest\Interfaces\IRRTranslations; |
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use kalanis\RemoteRequest\Protocols; |
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use kalanis\RemoteRequest\RequestException; |
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/** |
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* Class Answer |
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* @package RemoteRequest\Protocols\Fsp |
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* Process server's answer - FSP packet |
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*/ |
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class Answer extends Protocols\Dummy\Answer |
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{ |
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use Traits\THeader; |
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use Traits\TChecksum; |
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/** @var int */ |
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protected $headChecksum = 0; |
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/** @var int */ |
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protected $headCommand = 0; |
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/** @var int */ |
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protected $headServerKey = 0; |
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/** @var int */ |
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protected $headSequence = 0; |
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/** @var int */ |
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protected $headDataLength = 0; |
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/** @var int */ |
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protected $headFilePosition = 0; |
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/** @var string */ |
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protected $header = ''; |
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/** @var string */ |
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protected $content = ''; |
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/** @var string */ |
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protected $extra = ''; |
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/** @var IRRTranslations */ |
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protected $lang = null; |
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/** @var bool */ |
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public $canDump = false; // for dump info about checksums |
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public function __construct(IRRTranslations $lang) |
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{ |
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$this->lang = $lang; |
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} |
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/** |
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* @throws RequestException |
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* @return Answer |
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*/ |
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public function process(): Answer |
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{ |
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$this->checkSize(); |
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$this->getHeader(); |
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$this->processHeader(); |
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$this->processContent(); |
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$this->checkResponse(); |
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return $this; |
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} |
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/** |
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* @throws RequestException |
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*/ |
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protected function checkSize(): void |
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{ |
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// @phpstan-ignore-next-line |
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$loadSize = is_resource($this->body) ? fstat($this->body)['size'] : strlen(strval($this->body)); |
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if (Protocols\Fsp::HEADER_SIZE > $loadSize) { |
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1 |
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throw new RequestException($this->lang->rrFspResponseShort($loadSize)); |
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} |
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if (Protocols\Fsp::MAX_PACKET_SIZE < $loadSize) { |
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throw new RequestException($this->lang->rrFspResponseLarge($loadSize)); |
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} |
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} |
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protected function getHeader(): void |
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{ |
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$this->header = is_resource($this->body) |
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? strval(stream_get_contents($this->body, Protocols\Fsp::HEADER_SIZE, 0)) |
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: strval(substr(strval($this->body), 0, Protocols\Fsp::HEADER_SIZE)) |
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; |
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} |
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protected function processHeader(): void |
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{ |
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$this->headCommand = Strings::cutter($this->header, 0, 1); |
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$this->headChecksum = Strings::cutter($this->header, 1, 1); |
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$this->headServerKey = Strings::cutter($this->header, 2, 2); |
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$this->headSequence = Strings::cutter($this->header, 4, 2); |
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$this->headDataLength = Strings::cutter($this->header, 6, 2); |
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$this->headFilePosition = Strings::cutter($this->header, 8, 4); |
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} |
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protected function processContent(): void |
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{ |
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$content = is_resource($this->body) |
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? strval(stream_get_contents($this->body, -1, Protocols\Fsp::HEADER_SIZE)) |
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: strval(substr(strval($this->body), Protocols\Fsp::HEADER_SIZE)) |
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; |
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$this->content = strval(substr($content, 0, $this->getDataLength())); |
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$this->extra = strval(substr($content, $this->getDataLength())); |
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} |
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/** |
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* Generate server checksum from data and compare them |
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* @throws RequestException |
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*/ |
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protected function checkResponse(): void |
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{ |
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$checksum = $this->computeCheckSum(); |
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// @codeCoverageIgnoreStart |
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// necessary dumper - who can calculate checksums from their head? |
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if ($this->canDump) { |
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var_dump(['chksums', |
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'calc_raw' => $checksum, 'calc_hex' => dechex($checksum), 'calc_bin' => decbin($checksum), |
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'got_raw' => $this->headChecksum, 'got_hex' => dechex($this->headChecksum), 'got_bin' => decbin($this->headChecksum) |
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]); |
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} |
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// @codeCoverageIgnoreEnd |
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if ($checksum != $this->headChecksum ) { |
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throw new RequestException($this->lang->rrFspInvalidChecksum($checksum, $this->headChecksum)); |
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} |
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} |
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public function getInitialSumChunk(): int |
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{ |
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return 0; |
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} |
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public function getChecksumPacket(): string |
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{ |
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$content = $this->header . $this->content . $this->extra ; |
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$content[1] = chr(0); // null checksum |
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return $content; |
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} |
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public function getCommand(): int |
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{ |
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return intval($this->headCommand); |
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} |
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public function getKey(): int |
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{ |
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return intval($this->headServerKey); |
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} |
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public function getSequence(): int |
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{ |
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return intval($this->headSequence); |
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} |
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public function getDataLength(): int |
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{ |
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return intval($this->headDataLength); |
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} |
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public function getFilePosition(): int |
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{ |
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return intval($this->headFilePosition); |
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} |
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public function getContent(): string |
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{ |
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return strval($this->content); |
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} |
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public function getExtraData(): string |
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{ |
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return strval($this->extra); |
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} |
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} |
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alex-kalanis /
remote-request
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