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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\Header\Value\EntityTag\EntityTag; |
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use Stadly\Http\Utilities\Rfc7231; |
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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-Range. |
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* |
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* Specification: https://tools.ietf.org/html/rfc7233#section-3.2 |
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*/ |
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final class IfRange implements Header |
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{ |
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/** |
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* @var EntityTag|Date Strong validator. |
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*/ |
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private $validator; |
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/** |
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* Constructor. |
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* |
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* @param EntityTag|Date $validator Strong validator. |
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*/ |
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public function __construct($validator) |
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{ |
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$this->validator = $validator; |
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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 $value): self |
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{ |
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$entityTagRegEx = '{^' . Rfc7232::ENTITY_TAG . '$}'; |
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if (utf8_decode($value) === $value && preg_match($entityTagRegEx, $value) === 1) { |
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return new self(EntityTag::fromString($value)); |
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} |
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$dateRegEx = '{^' . Rfc7231::HTTP_DATE . '$}'; |
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if (utf8_decode($value) === $value && preg_match($dateRegEx, $value) === 1) { |
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return new self(Date::fromString($value, /*isWeak*/false)); |
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} |
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throw new InvalidHeader('Invalid header value: ' . $value); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function __toString(): string |
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{ |
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return $this->getName() . ': ' . $this->getValue(); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function isValid(): bool |
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{ |
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return !$this->validator->isWeak(); |
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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-Range'; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function getValue(): string |
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{ |
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if ($this->validator->isWeak()) { |
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throw new InvalidHeader('Validator must be strong.'); |
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} |
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return (string)$this->validator; |
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} |
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/** |
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* @param EntityTag|Date|null $validator Validator. Should be a strong entity tag or date, or null if unknown. |
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* @return bool Whether the condition is satisfied by the validator. |
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*/ |
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public function evaluate($validator): bool |
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{ |
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if ($validator instanceof EntityTag && $this->validator instanceof EntityTag) { |
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// Entity tags must be strong. |
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return $this->validator->compareStrongly($validator); |
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} |
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if ($validator instanceof Date && $this->validator instanceof Date) { |
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// Dates must be strong and match exactly. |
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return !$validator->isWeak() && !$this->validator->isWeak() && $this->validator->isEq($validator); |
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} |
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return false; |
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} |
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/** |
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* @return EntityTag|Date Strong validator. |
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*/ |
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public function getValidator() |
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{ |
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return $this->validator; |
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} |
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/** |
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* Set validator. |
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* |
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* @param EntityTag|Date $validator Strong validator. |
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*/ |
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public function setValidator($validator): void |
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{ |
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$this->validator = $validator; |
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} |
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} |
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Stadly /
Http
