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   1  <?php
   2  /*
   3   * This file is part of the PHPASN1 library.
   4   *
   5   * Copyright © Friedrich Große <[email protected]>
   6   *
   7   * For the full copyright and license information, please view the LICENSE
   8   * file that was distributed with this source code.
   9   */
  10  
  11  namespace FG\ASN1;
  12  
  13  use DateInterval;
  14  use DateTime;
  15  use DateTimeZone;
  16  use Exception;
  17  
  18  abstract class AbstractTime extends ASNObject
  19  {
  20      /** @var DateTime */
  21      protected $value;
  22  
  23      public function __construct($dateTime = null, $dateTimeZone = 'UTC')
  24      {
  25          if ($dateTime == null || is_string($dateTime)) {
  26              $timeZone = new DateTimeZone($dateTimeZone);
  27              $dateTimeObject = new DateTime($dateTime, $timeZone);
  28              if ($dateTimeObject == false) {
  29                  $errorMessage = $this->getLastDateTimeErrors();
  30                  $className = Identifier::getName($this->getType());
  31                  throw new Exception(sprintf("Could not create %s from date time string '%s': %s", $className, $dateTime, $errorMessage));
  32              }
  33              $dateTime = $dateTimeObject;
  34          } elseif (!$dateTime instanceof DateTime) {
  35              throw new Exception('Invalid first argument for some instance of AbstractTime constructor');
  36          }
  37  
  38          $this->value = $dateTime;
  39      }
  40  
  41      public function getContent()
  42      {
  43          return $this->value;
  44      }
  45  
  46      protected function getLastDateTimeErrors()
  47      {
  48          $messages = '';
  49          $lastErrors = DateTime::getLastErrors();
  50          foreach ($lastErrors['errors'] as $errorMessage) {
  51              $messages .= "{$errorMessage}, ";
  52          }
  53  
  54          return substr($messages, 0, -2);
  55      }
  56  
  57      public function __toString()
  58      {
  59          return $this->value->format("Y-m-d\tH:i:s");
  60      }
  61  
  62      protected static function extractTimeZoneData(&$binaryData, &$offsetIndex, DateTime $dateTime)
  63      {
  64          $sign = $binaryData[$offsetIndex++];
  65          $timeOffsetHours   = intval(substr($binaryData, $offsetIndex, 2));
  66          $timeOffsetMinutes = intval(substr($binaryData, $offsetIndex + 2, 2));
  67          $offsetIndex += 4;
  68  
  69          $interval = new DateInterval("PT{$timeOffsetHours}H{$timeOffsetMinutes}M");
  70          if ($sign == '+') {
  71              $dateTime->sub($interval);
  72          } else {
  73              $dateTime->add($interval);
  74          }
  75  
  76          return $dateTime;
  77      }
  78  }