Tower 日历加上时间信息

tower-ical.php

<?php
header('Content-Type: text/calendar; charset=utf-8');
$url = 'https://tower.im/calendars/ical/' . htmlspecialchars($_GET['id']) . '.ics';
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
$output = curl_exec($ch);
$lastkey = NULL;
$event = NULL;

foreach(preg_split('/((\r?\n)|(\r\n?))/u', $output) as $line) {
  if ($line === 'BEGIN:VEVENT') {
    $event = array ();
  } elseif ($line === 'END:VEVENT') {
    if (preg_match_all('/(\d?\d):(\d\d)(?: *)?([ap]m)?/u', mb_strtolower($event['DESCRIPTION']), $matches)) {
      $start = (int) ($matches[1][0] . $matches[2][0]);
      if ($matches[3][0] === 'pm' || (empty($matches[3][0]) && $matches[3][1] === 'pm')) {
        $start += 1200;
      }
      if (empty($matches[0][1])) {
        $end = $start + 100;
        if ($end > 2359) {
          $end = 2359;
        }
      } else {
        $end = (int) ($matches[1][1] . $matches[2][1]);
        if ($matches[3][1] === 'pm') {
          $end += 1200;
        }
      }
      $dtstart = $event['DTSTART'];
      $event['DTSTART'] = $dtstart . 'T' . sprintf('%04d', $start) . '00';
      $event['DTEND'] = $dtstart . 'T' . sprintf('%04d', $end) . '00';
      $event['DTSTART;TZID=Asia/Shanghai'] = $event['DTSTART'];
      $event['DTEND;TZID=Asia/Shanghai'] = $event['DTEND'];
    } else {
      $event['DTSTART;VALUE=DATE'] = $event['DTSTART'];
      $event['DTEND;VALUE=DATE'] = $event['DTEND'];
    }
    unset($event['DTSTART']);
    unset($event['DTEND']);
    echo 'BEGIN:VEVENT' . "\n";
    foreach($event as $key => $value) {
      echo $key . ':' . $value . "\n";
    }
    echo 'END:VEVENT' . "\n";
    $event = NULL;
  } elseif (!is_null($event)) {
    if ($line[0] === ' ') {
      $event[$lastkey] .= substr($line, 1);
    } else {
      list($key, $value) = explode(':', $line, 2);
      $event[$key] = $value;
      $lastkey = $key;
    }
  } elseif ($line === 'CALSCALE:GREGORIAN') {
    echo $line . "\n";
    echo "X-WR-TIMEZONE:Asia/Shanghai\n";
    echo "BEGIN:VTIMEZONE\n";
    echo "TZID:Asia/Shanghai\n";
    echo "X-LIC-LOCATION:Asia/Shanghai\n";
    echo "BEGIN:STANDARD\n";
    echo "TZOFFSETFROM:+0800\n";
    echo "TZOFFSETTO:+0800\n";
    echo "TZNAME:CST\n";
    echo "DTSTART:19700101T000000\n";
    echo "END:STANDARD\n";
    echo "END:VTIMEZONE\n";
  } else {
    echo $line . "\n";
  }
}
curl_close($ch);
?>