content_script.js

/**
  * Class Schedule to ICS File Exporter
  * (c) 2015 Keanu Lee
  * With contributions from: Baraa Hamodi
  *
  * Get ICS files for university class schedules in Oracle PeopleSoft systems (including UW Quest)
**/

$(function() {
  // Timezone for tool.
  var timezone = 'America/Toronto';

  // Date object -> '19920517'
  function getDateString(date) {
    var m = date.getMonth() + 1;
    if (m < 10) m = '0' + m;

    var d = date.getDate();
    if (d < 10) d = '0' + d;
    
    return '' + date.getFullYear() + m + d;
  }

  // '4:30PM' -> '163000'
  function getTimeString(time) {
    var timeString = time.substr(0, time.length - 2);
    var parts = timeString.split(':');
    if (parts[0].length != 2) {
      parts[0] = '0' + parts[0];
    }
    timeString = parts.join('') + '00';
    if (time.match(/PM/) && parts[0] != 12) {
      timeString = (parseInt(timeString, 10) + 120000).toString();
    }
    return timeString;
  }

  // Date object, '4:30PM' -> '19920517T163000'
  function getDateTimeString(date, time) {
    return getDateString(date) + 'T' + getTimeString(time);
  }

  // MTWThF -> MO,TU,WE,TH,FR
  function getDaysOfWeek(s) {
    var days = []
    if (s.match(/S[^a]/)) days.push('SU');
    if (s.match(/M/))     days.push('MO');
    if (s.match(/T[^h]/)) days.push('TU');
    if (s.match(/W/))     days.push('WE');
    if (s.match(/Th/))    days.push('TH');
    if (s.match(/F/))     days.push('FR');
    if (s.match(/S[^u]/)) days.push('SA');

    return days.join(',')
  }

  // VEVENT -> BEGIN:VCALENDAR...VEVENT...END:VCALENDAR
  function wrapICalContent(iCalContent) {
    return 'BEGIN:VCALENDAR\n' +
      'VERSION:2.0\n' +
      'PRODID:-//Keanu Lee/Class Schedule to ICS//EN\n' +
      iCalContent +
      'END:VCALENDAR\n';
  }

  var iCalContentArray = [];

  $('.PSGROUPBOXWBO').each(function() {
    var eventTitle = $(this).find('.PAGROUPDIVIDER').text().split('-');
    var courseCode = eventTitle[0];
    var courseName = eventTitle[1];
    var componentRows = $(this).find('.PSLEVEL3GRIDNBO').find('tr');

    componentRows.each(function() {
      var classNumber = $(this).find('span[id*="DERIVED_CLS_DTL_CLASS_NBR"]').text();

      if (classNumber) {
        var daysTimes     = $(this).find('span[id*="MTG_SCHED"]').text();
        var startEndTimes = daysTimes.match(/\d\d?:\d\d[AP]M/g);

        if (startEndTimes) {
          var daysOfWeek  = getDaysOfWeek(daysTimes.match(/[A-Za-z]* /)[0]);
          var startTime   = startEndTimes[0];
          var endTime     = startEndTimes[1];

          var section       = $(this).find('a[id*="MTG_SECTION"]').text();
          var component     = $(this).find('span[id*="MTG_COMP"]').text();
          var room          = $(this).find('span[id*="MTG_LOC"]').text();
          var instructor    = $(this).find('span[id*="DERIVED_CLS_DTL_SSR_INSTR_LONG"]').text();
          var startEndDate  = $(this).find('span[id*="MTG_DATES"]').text();

          // Start the event one day before the actual start date, then exclude it in an exception
          // date rule. This ensures an event does not occur on startDate if startDate is not on
          // part of daysOfWeek.
          var startDate = new Date(startEndDate.substring(0, 10));
          startDate.setDate(startDate.getDate() - 1);

          // End the event one day after the actual end date. Technically, the RRULE UNTIL field
          // should be the start time of the last occurence of an event. However, since the field
          // does not accept a timezone (only UTC time) and Toronto is always behind UTC, we can
          // just set the end date one day after and be guarenteed that no other occurence of
          // this event.
          var endDate = new Date(startEndDate.substring(13, 23));
          endDate.setDate(endDate.getDate() + 1);

          var iCalContent =
            'BEGIN:VEVENT\n' +
            'DTSTART;TZID=' + timezone + ':' + getDateTimeString(startDate, startTime) + '\n' +
            'DTEND;TZID=' + timezone + ':' + getDateTimeString(startDate, endTime) + '\n' +
            'LOCATION:' + room + '\n' +
            'RRULE:FREQ=WEEKLY;UNTIL=' + getDateTimeString(endDate, endTime) + 'Z;BYDAY=' + daysOfWeek + '\n' +
            'EXDATE;TZID=' + timezone + ':' + getDateTimeString(startDate, startTime) + '\n' +
            'SUMMARY:'  + courseCode + '(' + component + ')\n' +
            'DESCRIPTION:' +
              'Course Name: '    + courseName + '\\n' +
              'Section: '        + section + '\\n' +
              'Instructor: '     + instructor + '\\n' +
              'Component: '      + component + '\\n' +
              'Class Number: '   + classNumber + '\\n' +
              'Days/Times: '     + daysTimes + '\\n' +
              'Start/End Date: ' + startEndDate + '\\n' +
              'Location: '       + room + '\\n\n' +
            'END:VEVENT\n';

          // Remove double spaces from content.
          iCalContent = iCalContent.replace(/\s{2,}/g, ' ');

          iCalContentArray.push(iCalContent);

          $(this).find('span[id*="MTG_DATES"]').append(
            '<br><a href="#" onclick="window.open(\'data:text/calendar;charset=utf8,' +
            encodeURIComponent(wrapICalContent(iCalContent)) +
            '\');">Download Class</a>'
          );
        } // end if (startEndTimes)
      } // end if (classNumber)
    }); // end componentRows.each
  }); // end $(".PSGROUPBOXWBO").each

  if (iCalContentArray.length > 0) {
    $('.PATRANSACTIONTITLE').append(
      ' (<a href="#" onclick="window.open(\'data:text/calendar;charset=utf8,' +
      encodeURIComponent(wrapICalContent(iCalContentArray.join(''))) +
      '\');">Download Schedule</a>)'
    );
  }
})();