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<?php |
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declare(strict_types=1); |
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namespace Stadly\Http\Header\Value; |
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use DateTime; |
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use DateTimeImmutable; |
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use DateTimeInterface; |
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use DateTimeZone; |
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use InvalidArgumentException; |
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use Stadly\Http\Utilities\Rfc7231; |
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/** |
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* Class for handling dates. |
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* |
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* Specification: https://tools.ietf.org/html/rfc7231#section-7.1.1.1 |
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*/ |
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final class Date |
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{ |
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/** |
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* @var DateTimeImmutable Date. |
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*/ |
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private $date; |
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/** |
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* @var bool Whether the date is a weak validator. |
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*/ |
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private $isWeak; |
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/** |
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* Constructor. |
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* |
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* @param DateTimeInterface $date Date. |
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* @param bool $isWeak Whether the date is a weak validator. |
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*/ |
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public function __construct(DateTimeInterface $date, bool $isWeak = true) |
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{ |
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// Discard microseconds. |
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$immutableDate = DateTimeImmutable::createFromFormat('U', $date->format('U')); |
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assert($immutableDate !== false); |
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$this->date = $immutableDate->setTimezone(new DateTimeZone('GMT')); |
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$this->isWeak = $isWeak; |
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} |
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/** |
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* Construct date from a Unix time timestamp. |
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* |
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* @param float $timestamp Unix time timestamp. |
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* @param bool $isWeak Whether the date is a weak validator. |
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* @return self Date generated based on the Unix time timestamp. |
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*/ |
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public static function fromTimestamp(float $timestamp, bool $isWeak = true): self |
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{ |
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$dateTime = DateTime::createFromFormat('U.u', sprintf('%.6F', $timestamp)); |
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assert($dateTime !== false); |
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return new self($dateTime, $isWeak); |
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} |
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/** |
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* Construct date from string. |
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* |
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* @param string $date Date string. |
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* @param bool $isWeak Whether the date is a weak validator. |
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* @return self Date generated based on the string. |
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*/ |
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public static function fromString(string $date, bool $isWeak = true): self |
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{ |
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$plainDate = mb_convert_encoding($date, 'ISO-8859-1', 'UTF-8'); |
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if ($plainDate === $date) { |
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if (preg_match('{^' . Rfc7231::IMF_FIXDATE . '$}', $date) === 1) { |
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$dateTime = DateTime::createFromFormat('D, d M Y H:i:s T', $date); |
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assert($dateTime !== false); |
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return new self($dateTime, $isWeak); |
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} |
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if (preg_match('{^' . Rfc7231::RFC850_DATE . '$}', $date) === 1) { |
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return self::fromRfc850String($date, $isWeak); |
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} |
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if (preg_match('{^' . Rfc7231::ASCTIME_DATE . '$}', $date) === 1) { |
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$dateTime = DateTime::createFromFormat('D M j H:i:s Y', $date, new DateTimeZone('GMT')); |
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assert($dateTime !== false); |
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return new self($dateTime, $isWeak); |
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} |
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} |
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throw new InvalidArgumentException('Invalid date: ' . $date); |
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} |
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private static function fromRfc850String(string $date, bool $isWeak): self |
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{ |
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$now = new DateTimeImmutable('now', new DateTimeZone('GMT')); |
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preg_match('{^' . Rfc7231::RFC850_DATE_CAPTURE . '$}', $date, $matches); |
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// Assume the year belongs to the next century. |
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$year = (1 + (int)substr($now->format('Y'), 0, -2)) . $matches['YEAR']; |
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$newDate = sprintf('%s-%s-%s %s', $matches['DAY'], $matches['MONTH'], $year, $matches['TIME_OF_DAY']); |
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$dateTime = DateTime::createFromFormat('d-M-Y H:i:s', $newDate, new DateTimeZone('GMT')); |
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assert($dateTime !== false); |
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// While date is more than 50 years in the future, interpret the date as 100 years earlier. |
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while ($now->modify('+50 years') < $dateTime) { |
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$dateTime->modify('-100 years'); |
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} |
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return new self($dateTime, $isWeak); |
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} |
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/** |
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* @return string String representation of the date. |
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*/ |
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public function __toString(): string |
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{ |
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return $this->date->format('D, d M Y H:i:s T'); |
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} |
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/** |
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* Specification: https://tools.ietf.org/html/rfc7232#section-2.1 |
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* |
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* @return bool Whether the date is a weak validator. |
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*/ |
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public function isWeak(): bool |
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{ |
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return $this->isWeak; |
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} |
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/** |
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* @param self $date Date to compare with. |
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* @return bool Whether this date is earlier than the date it is compared to. |
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*/ |
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public function isLt(self $date): bool |
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{ |
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return $this->date < $date->date; |
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} |
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/** |
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* @param self $date Date to compare with. |
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* @return bool Whether this date is earlier than or the same as the date it is compared to. |
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*/ |
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public function isLte(self $date): bool |
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{ |
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return $this->date <= $date->date; |
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} |
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/** |
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* @param self $date Date to compare with. |
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* @return bool Whether this date is the same as the date it is compared to. |
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*/ |
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public function isEq(self $date): bool |
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{ |
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$format = DateTimeInterface::RFC3339_EXTENDED; |
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return $this->date->format($format) === $date->date->format($format); |
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} |
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/** |
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* @param self $date Date to compare with. |
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* @return bool Whether this date is later than or the same as the date it is compared to. |
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*/ |
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public function isGte(self $date): bool |
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{ |
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return $this->date >= $date->date; |
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} |
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/** |
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* @param self $date Date to compare with. |
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* @return bool Whether this date is later than the date it is compared to. |
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*/ |
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public function isGt(self $date): bool |
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{ |
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return $this->date > $date->date; |
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} |
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} |
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