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<?php |
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namespace vipnytt\RobotsTxtParser\Core; |
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use vipnytt\RobotsTxtParser\Exceptions\StatusCodeException; |
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/** |
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* Class StatusCodeParser |
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* |
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* @package vipnytt\RobotsTxtParser\Core |
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*/ |
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class StatusCodeParser implements RobotsTxtInterface |
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{ |
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/** |
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* Valid schemes |
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*/ |
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const VALID_SCHEME = [ |
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'http', |
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'https', |
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]; |
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/** |
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* Status code |
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* @var int |
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*/ |
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protected $code; |
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/** |
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* Scheme |
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* @var string|false |
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*/ |
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protected $scheme; |
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/** |
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* Applicable |
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* @var bool |
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*/ |
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protected $applicable; |
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/** |
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* Replacement coded |
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* @var array |
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*/ |
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protected $unofficialCodes = [ |
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522 => 408, // CloudFlare could not negotiate a TCP handshake with the origin server. |
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523 => 404, // CloudFlare could not reach the origin server; for example, if the DNS records for the baseUrl server are incorrect. |
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524 => 408, // CloudFlare was able to complete a TCP connection to the origin server, but did not receive a timely HTTP response. |
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]; |
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/** |
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* Constructor |
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* |
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* @param int|null $code - HTTP status code |
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* @param string|false $scheme |
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* @throws StatusCodeException |
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*/ |
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public function __construct($code, $scheme) |
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{ |
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$this->code = $code; |
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$this->scheme = $scheme; |
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$this->applicable = $this->isApplicable(); |
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} |
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/** |
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* Check if URL is Applicable for Status code parsing |
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* |
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* @return bool |
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* @throws StatusCodeException |
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*/ |
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protected function isApplicable() |
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{ |
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if ( |
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!in_array($this->scheme, self::VALID_SCHEME) || |
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$this->code === null |
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) { |
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return false; |
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} |
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if ( |
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$this->code < 100 || |
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$this->code > 599 |
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) { |
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throw new StatusCodeException('Invalid HTTP status code'); |
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} |
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return true; |
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} |
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/** |
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* Replace an unofficial code |
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* |
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* @return int|false |
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*/ |
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public function replaceUnofficial() |
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{ |
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if (in_array($this->code, array_keys($this->unofficialCodes))) { |
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$this->code = $this->unofficialCodes[$this->code]; |
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return $this->code; |
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} |
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return false; |
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} |
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/** |
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* Determine the correct group |
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* |
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* @return string|null |
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*/ |
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public function check() |
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{ |
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if (!$this->applicable) { |
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return null; |
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} |
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switch (floor($this->code / 100) * 100) { |
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case 300: |
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case 400: |
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return self::DIRECTIVE_ALLOW; |
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case 500: |
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return self::DIRECTIVE_DISALLOW; |
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} |
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return null; |
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} |
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} |
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VIPnytt /
RobotsTxtParser
