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<?php |
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declare(strict_types=1); |
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namespace Stadly\Http\Header\Value\CacheControl; |
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use InvalidArgumentException; |
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use Stadly\Http\Utilities\Rfc7230; |
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use Stadly\Http\Utilities\Rfc7234; |
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/** |
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* Class for handling cache control directives with optional value. |
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* |
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* Specification: https://tools.ietf.org/html/rfc7234#section-5.2.2 |
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*/ |
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final class GeneralDirective extends Directive |
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{ |
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/** |
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* @var string|null Value. |
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*/ |
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private $value; |
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/** |
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* Constructor. |
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* |
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* @param string $name Name. |
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* @param string|null $value Value. |
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*/ |
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public function __construct(string $name, ?string $value = null) |
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{ |
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$this->setName($name); |
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$this->setValue($value); |
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} |
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/** |
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* Construct directive from string. |
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* |
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* @param string $directive Directive string. |
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* @return self Directive generated based on the string. |
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*/ |
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public static function fromString(string $directive): self |
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{ |
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$regEx = '{^' . Rfc7234::CACHE_DIRECTIVE_CAPTURE . '$}'; |
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if (utf8_decode($directive) !== $directive || preg_match($regEx, $directive, $matches) !== 1) { |
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throw new InvalidArgumentException('Invalid directive: ' . $directive); |
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} |
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if (!isset($matches['VALUE'])) { |
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return new self($matches['NAME'], /*value*/null); |
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} |
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$value = $matches['VALUE']; |
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// Strip slashes if value is quoted. |
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if (mb_strlen($value) >= 2 && mb_substr($value, 0, 1) === '"' && mb_substr($value, -1) === '"') { |
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$value = stripslashes(mb_substr($value, 1, -1)); |
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} |
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return new self($matches['NAME'], $value); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function __toString(): string |
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{ |
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if ($this->value === null) { |
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return $this->name; |
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} |
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return $this->name . '=' . self::encodeValue($this->value); |
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} |
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/** |
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* @param string $name Name. |
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*/ |
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public function setName(string $name): void |
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{ |
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if (utf8_decode($name) !== $name || preg_match('{^' . Rfc7230::TOKEN . '$}', $name) !== 1) { |
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throw new InvalidArgumentException('Invalid name: ' . $name); |
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} |
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if (in_array(strtolower($name), FieldListDirective::RESERVED_NAMES, /*strict*/true)) { |
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throw new InvalidArgumentException('Name reserved for field list directive: ' . $name); |
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} |
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if (in_array(strtolower($name), IntegerDirective::RESERVED_NAMES, /*strict*/true)) { |
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throw new InvalidArgumentException('Name reserved for integer directive: ' . $name); |
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} |
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if (in_array(strtolower($name), ValuelessDirective::RESERVED_NAMES, /*strict*/true)) { |
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throw new InvalidArgumentException('Name reserved for valueless directive: ' . $name); |
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} |
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$this->name = $name; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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1 |
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public function getValue(): ?string |
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{ |
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return $this->value; |
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} |
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/** |
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* @param string|null $value Value. |
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*/ |
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5 |
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public function setValue(?string $value): void |
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{ |
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if ($value !== null) { |
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$encodedValue = self::encodeValue($value); |
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$regEx = '{^(?:' . Rfc7230::TOKEN . '|' . Rfc7230::QUOTED_STRING . ')$}'; |
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if (utf8_decode($encodedValue) !== $encodedValue || preg_match($regEx, $encodedValue) !== 1) { |
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throw new InvalidArgumentException('Invalid value: ' . $value); |
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} |
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} |
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$this->value = $value; |
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} |
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/** |
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* @param string $value Value. |
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* @return string Encoded value. |
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*/ |
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private static function encodeValue(string $value): string |
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{ |
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if (preg_match('{^' . Rfc7230::TOKEN . '$}', $value) === 1) { |
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return $value; |
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} |
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// If value is not a valid token, turn it into a quoted token. |
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return '"' . addslashes($value) . '"'; |
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} |
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} |
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Stadly /
Http
