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Re: [rt-users] Further iCal/RSS experimenting/problems & some success

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jpierce at cambridgeenergyalliance

Apr 8, 2009, 5:14 PM

Post #1 of 3 (1019 views)
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Re: [rt-users] Further iCal/RSS experimenting/problems & some success

While trying to debug another feed for Google Calendar,
I discovered that some iCal parsers are stricter than others.
Technically, every entry in iCal is supposed to be on its own
line, although lax parsers will fold lines as necessary.
Google Calendar, and probably others won't.

It seems the iCal emitted by RT (probably through the
Text::vFile dependency, but I've not tracked it down), is
inserting bogus newlines into the stream & splitting desc:
BEGIN:VCALENDAR
CALSCALE:gregorian
METHOD:publish
PRODID:-//CEA//
VERSION:2.0
X-WR-CALDESC;VALUE=TEXT:Due dates for RT tickets: Queue = 'SPAM' AND Status
= 'new'
X-WR-CALNAME;VALUE=TEXT:RT due dates
END:VCALENDAR

Instead of:
BEGIN:VCALENDAR
CALSCALE:gregorian
METHOD:publish
PRODID:-//CEA//
VERSION:2.0
X-WR-CALDESC;VALUE=TEXT:Due dates for RT tickets: Queue = 'SPAM' AND
Status = 'new'
X-WR-CALNAME;VALUE=TEXT:RT due dates
END:VCALENDAR

Even an empty stream from RT such as that above does not
check out in an online iCal validator.

There may be other issues as well...
http://www.google.com/support/forum/p/Calendar/thread?tid=5a31bba3997587ce
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jpierce at cambridgeenergyalliance

Apr 8, 2009, 5:32 PM

Post #2 of 3 (944 views)
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Re: [rt-users] Further iCal/RSS experimenting/problems & some success [In reply to]

Actually, according to the RFC, the content is supposed to be folded :-/
Which occurs in Data::ICal::Property::_fold...

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jpierce at cambridgeenergyalliance

Apr 8, 2009, 6:23 PM

Post #3 of 3 (950 views)
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Re: [rt-users] Further iCal/RSS experimenting/problems & some success [In reply to]

After patching Data::iCal (it was not folding per the RFC),
I've been able to intermittently-add RT iCal feeds to google
calendar, but never see any events. As per the previously
referenced thread, this is symptomatic of other issues with
the feed...

--- /usr/lib/perl5/site_perl/5.8.5/Data/ICal/Property.pm~
2007-01-12 13:21:32.000000000 -0500
+++ /usr/lib/perl5/site_perl/5.8.5/Data/ICal/Property.pm
2009-04-08 20:56:49.000000000 -0400
@@ -316,7 +316,7 @@
# }
} else {
while ( $string =~ /(.{76})/ ) {
- $string =~ s/(.{75})(.)/$1\n $2/;
+ $string =~ s/(.{64,74}\b)|(.{74})/$1\r\n\t/;
}
}
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