Handle Timezone When No (or invalid) TZID is Provided

src/IcalParser.php

@@ -10,6 +10,9 @@ class IcalParser {
 	/** @var \DateTimeZone */
 	public $timezone;
 
+    /** @var string */
+    public $title;
+
 	/** @var array */
 	public $data;
 
@@ -382,7 +385,26 @@ private function parseRow($row) {
 				    // if this is an invalid timezone, then fallback to GMT.  This logic may not be right!
 				    $this->timezone = new \DateTimeZone("GMT");
                 }
-			}
+			} else if ($key === "TZOFFSETTO" &&
+                (!isset($this->timezone) ||
+                    $this->timezone->getName() === "GMT") &&
+                preg_match("/[-+]?(?<hours>[\d]{2})(?<minutes>[\d]{2})/", $value, $matches)
+            ) {
+                // if timezone is invalid and TZOFFSETTO is provided, use that to build a timezone
+                $seconds = intval($matches["hours"]) * 60 * 60 + intval($matches["minutes"]) * 60;
+
+                if ($value[0] === "-") {
+                    $seconds *= -1;
+                }
+
+                // TZOFFSETTO provides local time offset when DST is not in operation, so I think this is right
+                $timezoneName = timezone_name_from_abbr("", $seconds, false);
+                $this->timezone = new \DateTimezone($timezoneName);
+            }
+
+            if ($key === "X-WR-CALNAME") {
+                $this->title = $value;
+            }
 
 			// have some middle part ?
 			if ($middle && preg_match_all('#(?<key>[^=;]+)=(?<value>[^;]+)#', $middle, $matches, PREG_SET_ORDER)) {

tests/cal/calendar_title.ics

@@ -0,0 +1,63 @@
+BEGIN:VCALENDAR
+PRODID:-//Google Inc//Google Calendar 70.9054//EN
+VERSION:2.0
+CALSCALE:GREGORIAN
+METHOD:PUBLISH
+X-WR-CALNAME:School Board
+X-WR-TIMEZONE:America/Chicago
+X-WR-CALDESC:
+BEGIN:VTIMEZONE
+TZID:America/Chicago
+X-LIC-LOCATION:America/Chicago
+BEGIN:DAYLIGHT
+TZOFFSETFROM:-0600
+TZOFFSETTO:-0500
+TZNAME:CDT
+DTSTART:19700308T020000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:-0500
+TZOFFSETTO:-0600
+TZNAME:CST
+DTSTART:19701101T020000
+RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+DTSTART;TZID=America/Chicago:20160808T180000
+DTEND;TZID=America/Chicago:20160808T203000
+DTSTAMP:20160718T160226Z
+UID:kpgr4590djmi89l3sv51gmalrc@google.com
+ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=School
+  Board;X-NUM-GUESTS=0:mailto:aliceisd.net_7hatmpq9uek3a1h6if0r0sn5bc@group.
+ calendar.google.com
+RECURRENCE-ID;TZID=America/Chicago:20160808T183000
+CREATED:20150715T183809Z
+DESCRIPTION:
+LAST-MODIFIED:20160718T155538Z
+LOCATION:
+SEQUENCE:1
+STATUS:CONFIRMED
+SUMMARY:Regular Board Meeting Modified
+TRANSP:OPAQUE
+END:VEVENT
+BEGIN:VEVENT
+DTSTART;TZID=America/Chicago:20150810T183000
+DTEND;TZID=America/Chicago:20150810T210000
+RRULE:FREQ=MONTHLY;UNTIL=20180709T233000Z;BYDAY=2MO
+DTSTAMP:20160718T160226Z
+UID:kpgr4590djmi89l3sv51gmalrc@google.com
+ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=School
+  Board;X-NUM-GUESTS=0:mailto:aliceisd.net_7hatmpq9uek3a1h6if0r0sn5bc@group.
+ calendar.google.com
+CREATED:20150715T183809Z
+DESCRIPTION:
+LAST-MODIFIED:20160718T155538Z
+LOCATION:
+SEQUENCE:0
+STATUS:CONFIRMED
+SUMMARY:Regular Board Meeting
+TRANSP:OPAQUE
+END:VEVENT
+END:VCALENDAR

tests/cal/no_tzid.ics

@@ -0,0 +1,58 @@
+BEGIN:VCALENDAR
+PRODID:-//Google Inc//Google Calendar 70.9054//EN
+VERSION:2.0
+CALSCALE:GREGORIAN
+METHOD:PUBLISH
+X-WR-CALNAME:School Board
+X-WR-CALDESC:
+BEGIN:VTIMEZONE
+BEGIN:DAYLIGHT
+TZOFFSETFROM:-0600
+TZOFFSETTO:-0500
+DTSTART:19700308T020000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:-0500
+TZOFFSETTO:-0600
+DTSTART:19701101T020000
+RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+DTSTART;TZID=America/Chicago:20160808T180000
+DTEND;TZID=America/Chicago:20160808T203000
+DTSTAMP:20160718T160226Z
+UID:kpgr4590djmi89l3sv51gmalrc@google.com
+ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=School
+  Board;X-NUM-GUESTS=0:mailto:aliceisd.net_7hatmpq9uek3a1h6if0r0sn5bc@group.
+ calendar.google.com
+RECURRENCE-ID;TZID=America/Chicago:20160808T183000
+CREATED:20150715T183809Z
+DESCRIPTION:
+LAST-MODIFIED:20160718T155538Z
+LOCATION:
+SEQUENCE:1
+STATUS:CONFIRMED
+SUMMARY:Regular Board Meeting Modified
+TRANSP:OPAQUE
+END:VEVENT
+BEGIN:VEVENT
+DTSTART;TZID=America/Chicago:20150810T183000
+DTEND;TZID=America/Chicago:20150810T210000
+RRULE:FREQ=MONTHLY;UNTIL=20180709T233000Z;BYDAY=2MO
+DTSTAMP:20160718T160226Z
+UID:kpgr4590djmi89l3sv51gmalrc@google.com
+ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=School
+  Board;X-NUM-GUESTS=0:mailto:aliceisd.net_7hatmpq9uek3a1h6if0r0sn5bc@group.
+ calendar.google.com
+CREATED:20150715T183809Z
+DESCRIPTION:
+LAST-MODIFIED:20160718T155538Z
+LOCATION:
+SEQUENCE:0
+STATUS:CONFIRMED
+SUMMARY:Regular Board Meeting
+TRANSP:OPAQUE
+END:VEVENT
+END:VCALENDAR

tests/calendar_title.phpt

@@ -0,0 +1,12 @@
+<?php
+/**
+ * @author Roman Ozana <ozana@omdesign.cz>
+ */
+use Tester\Assert;
+
+require_once __DIR__ . '/../vendor/autoload.php';
+\Tester\Environment::setup();
+
+$cal = new \om\IcalParser();
+$results = $cal->parseFile(__DIR__ . '/cal/calendar_title.ics');
+Assert::same('School Board', $cal->title);

tests/no_tzid_value.phpt

@@ -0,0 +1,13 @@
+<?php
+/**
+ * @author Marc Vachette <marc.vachette@gmail.com>
+ */
+use Tester\Assert;
+
+require_once __DIR__ . '/../vendor/autoload.php';
+\Tester\Environment::setup();
+
+//some clean timezone
+$cal = new \om\IcalParser();
+$results = $cal->parseFile(__DIR__ . '/cal/no_tzid.ics');
+Assert::same('America/New_York', $cal->timezone->getName());