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<?php declare(strict_types=1); |
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namespace Lisachenko\Protocol\FCGI; |
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use Lisachenko\Protocol\FCGI; |
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/** |
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* FCGI record. |
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* |
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* @author Alexander.Lisachenko |
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*/ |
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class Record |
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{ |
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/** |
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* Identifies the FastCGI protocol version. |
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* |
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* @var int |
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*/ |
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protected $version = FCGI::VERSION_1; |
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/** |
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* Identifies the FastCGI record type, i.e. the general function that the record performs. |
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* |
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* @var int |
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*/ |
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protected $type = FCGI::UNKNOWN_TYPE; |
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/** |
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* Identifies the FastCGI request to which the record belongs. |
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* |
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* @var int |
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*/ |
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protected $requestId = FCGI::NULL_REQUEST_ID; |
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/** |
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* Reserved byte for future proposes |
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* |
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* @var int |
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*/ |
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protected $reserved = 0; |
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/** |
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* The number of bytes in the contentData component of the record. |
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* |
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* @var int |
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*/ |
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private $contentLength = 0; |
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/** |
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* The number of bytes in the paddingData component of the record. |
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* |
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* @var int |
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*/ |
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private $paddingLength = 0; |
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/** |
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* Binary data, between 0 and 65535 bytes of data, interpreted according to the record type. |
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* |
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* @var string |
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*/ |
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private $contentData = ''; |
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/** |
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* Padding data, between 0 and 255 bytes of data, which are ignored. |
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* |
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* @var string |
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*/ |
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private $paddingData = ''; |
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/** |
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* Unpacks the message from the binary data buffer |
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* |
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* @param string $data Binary buffer with raw data |
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* |
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* @return static |
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*/ |
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final public static function unpack(string $data): self |
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{ |
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$self = new static(); |
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[ |
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$self->version, |
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$self->type, |
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$self->requestId, |
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$self->contentLength, |
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$self->paddingLength, |
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$self->reserved |
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] = array_values(unpack(FCGI::HEADER_FORMAT, $data)); |
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$payload = substr($data, FCGI::HEADER_LEN); |
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self::unpackPayload($self, $payload); |
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if (get_called_class() !== __CLASS__ && $self->contentLength > 0) { |
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static::unpackPayload($self, $payload); |
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} |
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return $self; |
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} |
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/** |
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* Returns the binary message representation of record |
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*/ |
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final public function __toString(): string |
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{ |
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$headerPacket = pack( |
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"CCnnCC", |
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$this->version, |
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$this->type, |
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$this->requestId, |
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$this->contentLength, |
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$this->paddingLength, |
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$this->reserved |
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); |
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$payloadPacket = $this->packPayload(); |
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$paddingPacket = pack("a{$this->paddingLength}", $this->paddingData); |
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return $headerPacket . $payloadPacket . $paddingPacket; |
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} |
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/** |
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* Sets the content data and adjusts the length fields |
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* |
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* @param string $data |
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* |
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* @return static |
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*/ |
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public function setContentData(string $data): self |
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{ |
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$this->contentData = $data; |
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$this->contentLength = strlen($this->contentData); |
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$extraLength = $this->contentLength % 8; |
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$this->paddingLength = $extraLength ? (8 - $extraLength) : 0; |
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return $this; |
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} |
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/** |
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* Returns the context data from the record |
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*/ |
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public function getContentData(): string |
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{ |
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return $this->contentData; |
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} |
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/** |
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* Returns the version of record |
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*/ |
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public function getVersion(): int |
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{ |
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return $this->version; |
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} |
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/** |
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* Returns record type |
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*/ |
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public function getType(): int |
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{ |
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return $this->type; |
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} |
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/** |
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* Returns request ID |
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*/ |
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public function getRequestId(): int |
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{ |
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return $this->requestId; |
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} |
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/** |
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* Sets request ID |
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* |
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* There should be only one unique ID for all active requests, |
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* use random number or preferably resetting auto-increment. |
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* |
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* @param int $requestId |
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* |
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* @return static |
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*/ |
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public function setRequestId(int $requestId): self |
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{ |
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$this->requestId = $requestId; |
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return $this; |
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} |
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/** |
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* Returns the size of content length |
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*/ |
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final public function getContentLength(): int |
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{ |
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return $this->contentLength; |
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} |
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/** |
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* Returns the size of padding length |
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*/ |
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final public function getPaddingLength(): int |
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{ |
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return $this->paddingLength; |
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} |
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/** |
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* Method to unpack the payload for the record. |
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* |
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* NB: Default implementation will be always called |
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* |
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* @param static $self Instance of current frame |
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* @param string $data Binary data |
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*/ |
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protected static function unpackPayload($self, string $data): void |
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{ |
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[ |
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$self->contentData, |
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$self->paddingData |
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] = array_values( |
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unpack("a{$self->contentLength}contentData/a{$self->paddingLength}paddingData", $data) |
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); |
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} |
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/** |
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* Implementation of packing the payload |
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*/ |
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protected function packPayload(): string |
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{ |
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return pack("a{$this->contentLength}", $this->contentData); |
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} |
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} |
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