Tickets :: Comment on [#12773] Horde_Timezone unable to use non-ftp scheme to access database.

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Comment	> So I have a workaround... but not quite a fix yet. > > I started knowing that something is wonky with sending UTC in DTSTART > and DTEND. Google wasn't doing that in their iCal. Also Google was > sending a VTIMEZONE section. Investigating the RFC for iCal > formats.It says: > > ----- > The "VTIMEZONE" calendar component MUST be present if the iCalendar > object contains an RRULE that generates dates on both sides of a time > zone shift (e.g. both in Standard Time and Daylight Saving Time) > unless the iCalendar object intends to convey a floating time (See > the section "4.1.10.11 Time" for proper interpretation of floating > time). It can be present if the iCalendar object does not contain > such a RRULE. In addition, if a RRULE is present, there MUST be valid > time zone information for all recurrence instances. > ----- > > So I added a VTIMEZONE section to my file I posted earlier, horde's > output.ics. That didn't work. I took that back out, and then just > changed the dates in DTSTART and DTEND to include a TZID definition > like in google's ics file. Upon importing this ICS file, it worked > properly! Clearly the answer is to be using "floating times" as the > RFC suggests, i.e. not UTC which changes relative to timezones with > observe DST. > > Of course, I'm sure Horde wasn't violating RFC on purpose. So I > started looking in the Horde code where DTSTART and DTEND are parsed. > I found this of interest in kronolith/lib/Event.php: > > // For certain recur types, we must output in the event's timezone > // so that the BYDAY values do not get out of sync with the UTC > // date-time. See Bug: 11339 > if ($this->recurs()) { > switch ($this->recurrence->getRecurType()) { > case Horde_Date_Recurrence::RECUR_WEEKLY: > case Horde_Date_Recurrence::RECUR_YEARLY_WEEKDAY: > case Horde_Date_Recurrence::RECUR_MONTHLY_WEEKDAY: > if (!$this->timezone) { > $this->timezone = date_default_timezone_get(); > } > } > } > > Clearly Horde is trying to set a timezone to stay in RFC compliance > for recurring events. But the TZID parameter was not being sent in > the DTSTART and DTEND parameters in the ICS download. Skip down to: > > if ($this->timezone) { > try { > $tz = > $GLOBALS['injector']->getInstance('Horde_Timezone'); > $vEvents[] = > $tz->getZone($this->timezone)->toVtimezone(); > $params['TZID'] = $this->timezone; > } catch (Horde_Exception $e) { > } > } > > where execution was actually ending in an exception. The line that > was failing was: > > $vEvents[] = > $tz->getZone($this->timezone)->toVtimezone(); > > which I just found by inserting some syslog lines here and there > until I narrowed down the failure. So then inside toVtimezone() I > added some more debug, but it was never being executed. So I looked > in pear/php/Horde/Timezone.php to see what was failing. It was the > function getZone being called above before passing to toVtimezone(): > > public function getZone($zone) > { > if (!$this->_zones) { > $this->_extractAndParse(); > } > $alias = isset($this->_links[$zone]) ? $this->_links[$zone] : $zone; > if (!isset($this->_zones[$alias])) { > throw new Horde_Timezone_Exception(sprintf('Timezone %s > not found', $zone)); > } > $this->_zones[$alias]->setTzid($alias); > return $this->_zones[$alias]; > } > > I found that > > $this->_extractAndParse(); > > was the line failing. Looking there, I found what was failing: > > protected function _extractAndParse() > { > .... > > if (!$this->_tmpfile) { > $this->_download(); > } > > It was the _download() call failing. Well, turns out _download is > trying to pull from $conf['timezone']['location'] which is defined in > kronolith/config/conf.php as > ftp://ftp.iana.org/tz/tzdata-latest.tar.gz' > > So I found that if you've got SELinux enforcing (which you should), > you'll need to make sure you enable httpd_can_network_connect so that > kronolith can download this data from the iana ftp server. You'll > also need to open iptables/firewall/network access to ftp.iana.org if > you lock that down. Once I did this, Horde was sending ICS properly > again, every recurring event had their DTSTART and DTEND parameters > with a TZID specification. Hooray! > > However, for those of us more security-minded, I'd like to not have > httpd_can_network_connect enabled. I'd like to be able to load this > file in outside of CGI. So I downloaded the file manually and set the > following in kronolith/config/conf.php: > > $conf['timezone']['location'] = 'file:///var/www/horde/tzdata-latest.tar.gz'; > > But now the code in _download in pear/php/Horde/Timezone.php failed around: > > try { > if ($url['scheme'] == 'ftp') { > $vfs = new Horde_Vfs_Ftp(array('hostspec' => $url['host'], > 'username' => 'anonymous', > 'password' => 'anonymous')); > } else { > $vfs = new Horde_Vfs_File(); > } > $this->_tmpfile = $vfs->readFile(dirname($url['path']), > basename($url['path'])); > } catch (Horde_Vfs_Exception $e) { > throw new Horde_Timezone_Exception($e); > } > > At the point: > > $vfs = new Horde_Vfs_File(); > > Should this perhaps be: > > $vfs = new Horde_Vfs_File(array('vfsroot' => > Horde::getTempDir())); > > as a proper construction?
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