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<?php |
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declare(strict_types=1); |
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namespace Stadly\Http\Header\Request; |
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use Stadly\Http\Exception\InvalidHeader; |
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use Stadly\Http\Header\Value\Date; |
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use Stadly\Http\Utilities\Rfc7232; |
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/** |
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* Class for handling the HTTP header field If-Modified-Since. |
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* |
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* Specification: https://tools.ietf.org/html/rfc7232#section-3.3 |
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*/ |
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final class IfModifiedSince implements Header |
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{ |
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* @var Date Date. |
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*/ |
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private $date; |
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/** |
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* Constructor. |
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* |
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* @param Date $date Date. |
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*/ |
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public function __construct(Date $date) |
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{ |
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$this->setDate($date); |
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} |
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/** |
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* Construct header from value. |
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* |
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* @param string $value Header value. |
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* @return self Header generated based on the value. |
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* @throws InvalidHeader If the header value is invalid. |
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*/ |
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public static function fromValue(string $value): self |
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{ |
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$regEx = '{^' . Rfc7232::IF_MODIFIED_SINCE . '$}'; |
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if (utf8_decode($value) !== $value || preg_match($regEx, $value) !== 1) { |
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throw new InvalidHeader('Invalid header value: ' . $value); |
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} |
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return new self(Date::fromString($value)); |
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} |
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/** |
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* @inheritDoc |
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* @throws void The header is always valid. |
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*/ |
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public function __toString(): string |
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{ |
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return $this->getName() . ': ' . $this->getValue(); |
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} |
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/** |
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* @return true The header is always valid. |
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*/ |
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public function isValid(): bool |
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{ |
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return true; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function getName(): string |
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{ |
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return 'If-Modified-Since'; |
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} |
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/** |
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* @inheritDoc |
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* @throws void The header is always valid. |
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*/ |
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public function getValue(): string |
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{ |
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return (string)$this->date; |
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} |
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/** |
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* @param Date|null $lastModifiedDate Last modified date, or null if unknown. |
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* @return bool Whether the condition is satisfied by the last modified date. |
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*/ |
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public function evaluate(?Date $lastModifiedDate): bool |
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{ |
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// If last modified date is unknown, the condition is satisfied. |
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if ($lastModifiedDate === null) { |
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return true; |
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} |
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return $lastModifiedDate->isGt($this->date); |
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} |
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/** |
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* @return Date Date. |
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*/ |
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public function getDate(): Date |
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{ |
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return $this->date; |
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} |
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/** |
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* Set date. |
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* |
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* @param Date $date Date. |
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*/ |
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public function setDate(Date $date): void |
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{ |
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$this->date = $date; |
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} |
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} |
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Stadly /
Http
