iCallendar parsing failed: ArrayIndexOutOfBoundsException

[theScrabi]

Hello,

I just found another parsing issue. I have trouble with the calendar provided by zam.haus: https://www.zam.haus/?mec-ical-feed=1. Unlike with my previous parsing issue, this time I can not provide a reason for why it fails. I can only give you the stracktrace that I get when trying to subscribe to the calendar.
Also, I checked the calendar with the iCalendar Validator again. It tells me the calendar is fine.

Thanks again for your great work.

Here is the stacktrace:

Couldn't parse iCalendar

at.bitfire.ical4android.InvalidCalendarException: Couldn't parse iCalendar
	at at.bitfire.ical4android.ICalendar$Companion.fromReader(SourceFile:98)
	at at.bitfire.ical4android.Event$Companion.eventsFromReader(SourceFile:118)
	at at.bitfire.icsdroid.model.ValidationModel$validate$1$downloader$1.onSuccess(SourceFile:65)
	at at.bitfire.icsdroid.CalendarFetcher.fetchNetwork$icsx5_82_2_2_6_standardRelease(SourceFile:156)
	at at.bitfire.icsdroid.CalendarFetcher$fetchNetwork$1.invokeSuspend(Unknown Source:11)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(SourceFile:33)
	at kotlinx.coroutines.DispatchedTask.run(SourceFile:100)
	at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(SourceFile:113)
	at kotlinx.coroutines.scheduling.TaskImpl.run(SourceFile:89)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(SourceFile:586)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(SourceFile:820)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(SourceFile:717)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(SourceFile:704)
Caused by: net.fortuna.ical4j.data.ParserException: Error at line 390:java.lang.ArrayIndexOutOfBoundsException: length=1; index=1
	at net.fortuna.ical4j.data.CalendarParserImpl.parse(SourceFile:172)
	at net.fortuna.ical4j.data.CalendarBuilder.build(SourceFile:191)
	at net.fortuna.ical4j.data.CalendarBuilder.build(SourceFile:179)
	at at.bitfire.ical4android.ICalendar$Companion.fromReader(SourceFile:96)
	... 12 more
Caused by: java.lang.IllegalArgumentException: java.lang.ArrayIndexOutOfBoundsException: length=1; index=1
	at net.fortuna.ical4j.model.parameter.FmtType.<init>(SourceFile:67)
	at net.fortuna.ical4j.model.parameter.FmtType$Factory.createParameter(SourceFile:96)
	at net.fortuna.ical4j.model.parameter.FmtType$Factory.createParameter(SourceFile:87)
	at net.fortuna.ical4j.model.ParameterBuilder.build(SourceFile:66)
	at net.fortuna.ical4j.data.DefaultContentHandler.parameter(SourceFile:189)
	at net.fortuna.ical4j.data.CalendarParserImpl$ParameterParser.parse(SourceFile:387)
	at net.fortuna.ical4j.data.CalendarParserImpl$ParameterParser.access$2000(SourceFile:335)
	at net.fortuna.ical4j.data.CalendarParserImpl$ParameterListParser.parse(SourceFile:330)
	at net.fortuna.ical4j.data.CalendarParserImpl$PropertyParser.parse(SourceFile:266)
	at net.fortuna.ical4j.data.CalendarParserImpl$PropertyParser.access$1100(SourceFile:241)
	at net.fortuna.ical4j.data.CalendarParserImpl$PropertyListParser.parse(SourceFile:226)
	at net.fortuna.ical4j.data.CalendarParserImpl$ComponentParser.parse(SourceFile:446)
	at net.fortuna.ical4j.data.CalendarParserImpl$ComponentParser.access$900(SourceFile:422)
	at net.fortuna.ical4j.data.CalendarParserImpl$PropertyListParser.parse(SourceFile:224)
	at net.fortuna.ical4j.data.CalendarParserImpl.parseCalendar(SourceFile:128)
	at net.fortuna.ical4j.data.CalendarParserImpl.parseCalendarList(SourceFile:194)
	at net.fortuna.ical4j.data.CalendarParserImpl.parse(SourceFile:163)
	... 15 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: length=1; index=1
	at net.fortuna.ical4j.model.parameter.FmtType.<init>(SourceFile:65)
	... 31 more

Here is the snapshot of the feed for which I got the error:
zam.zip

[sunkup]

You seem to have a knack for this. Thanks for reporting - seems to be an issue in the wordpress plugin which generates the ics.

The problem seems to be the missing MIME type of the FMTTYPE (Format Type) for the ATTACH property in the event UID:MEC-588e343066cf54ec3db5132231df7d68@zam.haus

ATTACH;FMTTYPE=:https://www.zam.haus/wp-content/uploads/2024/10/IMG_8323-2.heic

but should probably be:

ATTACH;FMTTYPE=image/heic:https://www.zam.haus/wp-content/uploads/2024/10/IMG_8323-2.heic

HEIC being a relatively new format I suppose the wordpress plugin which generated the ics can't handle it yet. So the issue should probably also be reported to the wordpress plugin developers. Not sure who that is though. Calendar has PRODID:-//WordPress - MECv7.18.0//EN, which might help find out.

[theScrabi]

Oh, thank you very much for finding that issue :D