So is there some sort of built in checking in Dday iCalendar that checks the input stream of what they are uploading is a valid iCalendar format. I am not sure what happens if something is not in proper format or if it is like a jpg being uploaded instead but has an Ical extension.
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Doug Day, the author of DDay.iCal, has now made a standalone validator available:
http://icalvalid.cloudapp.net
It is a work in progress, modeled on the Mark Pilgrim and Sam Ruby RSS/Atom validator (feedvalidator.org).
If you use Doug’s validator, let him know how it goes for you. He is eager for feedback.