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<?php |
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declare(strict_types=1); |
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namespace Hyphper\Frame; |
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use Hyphper\Frame\Exception\InvalidFrameException; |
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/** |
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* The ALTSVC frame is used to advertise alternate services that the current |
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* host, or a different one, can understand. This frame is standardised as |
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* part of RFC 7838. |
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* |
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* This frame does no work to validate that the ALTSVC field parameter is |
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* acceptable per the rules of RFC 7838. |
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* |
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* note: If the stream_id of this frame is nonzero, the origin field |
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* must have zero length. Conversely, if the stream_id of this |
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* frame is zero, the origin field must have nonzero length. Put |
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* another way, a valid ALTSVC frame has stream_id != 0 XOR |
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* strlen(origin) != 0. |
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* |
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* @package Hyphper\Frame |
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*/ |
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class AltSvcFrame extends \Hyphper\Frame |
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{ |
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protected $defined_flags = []; |
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protected $type = 0xA; |
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protected $stream_association = self::EITHER_STREAM; |
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protected $origin; |
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protected $field; |
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/** |
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* AltSvcFrame constructor. |
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* |
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* @param array $options |
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*/ |
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public function __construct(array $options = []) |
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{ |
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parent::__construct($options); |
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$this->origin = $options['origin'] ?? ''; |
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$this->field = $options['field'] ?? ''; |
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} |
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/** |
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* @return string |
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*/ |
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public function serializeBody(): string |
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{ |
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4 |
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$origin_len = pack('n', strlen($this->origin)); |
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return $origin_len . $this->origin . $this->field; |
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} |
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/** |
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* Given the body of a frame, parses it into frame data. This populates |
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* the non-header parts of the frame: that is, it does not populate the |
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* stream ID or flags. |
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* |
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* |
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* @param string $data |
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* @return void |
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*/ |
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public function parseBody(string $data) |
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{ |
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2 |
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if (!$unpack = @unpack('norigin_length', substr($data, 0, 2))) { |
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throw new InvalidFrameException('Invalid ALTSVC frame body.'); |
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} |
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2 |
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$origin_length = $unpack['origin_length']; |
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2 |
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$this->origin = substr($data, 2, $origin_length); |
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2 |
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if (strlen($this->origin) != $origin_length) { |
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throw new InvalidFrameException('Invalid ALTSVC frame body.'); |
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} |
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2 |
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$this->field = substr($data, 2 + $origin_length); |
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2 |
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$this->body_len = strlen($data); |
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2 |
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} |
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/** |
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* @param mixed|string $origin |
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* |
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* @return AltSvcFrame |
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*/ |
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2 |
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public function setOrigin($origin) |
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{ |
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2 |
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$this->origin = $origin; |
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return $this; |
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} |
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/** |
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* @return mixed|string |
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*/ |
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1 |
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public function getOrigin() |
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{ |
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1 |
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return $this->origin; |
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} |
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/** |
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* @param mixed|string $field |
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* |
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* @return AltSvcFrame |
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*/ |
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2 |
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public function setField($field) |
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{ |
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$this->field = $field; |
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return $this; |
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} |
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111
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/** |
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* @return mixed|string |
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113
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*/ |
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1 |
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public function getField() |
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{ |
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1 |
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return $this->field; |
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} |
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} |
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hyphper /
h2-frame
