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Diffstat (limited to 'src/main/java/at/bitfire/ical4android/validation/EventValidator.kt')
| -rw-r--r-- | src/main/java/at/bitfire/ical4android/validation/EventValidator.kt | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/src/main/java/at/bitfire/ical4android/validation/EventValidator.kt b/src/main/java/at/bitfire/ical4android/validation/EventValidator.kt new file mode 100644 index 0000000..ac0e108 --- /dev/null +++ b/src/main/java/at/bitfire/ical4android/validation/EventValidator.kt @@ -0,0 +1,107 @@ +/*************************************************************************************************** + * Copyright © All Contributors. See LICENSE and AUTHORS in the root directory for details. + **************************************************************************************************/ + +package at.bitfire.ical4android.validation + +import at.bitfire.ical4android.DateUtils +import at.bitfire.ical4android.Event +import at.bitfire.ical4android.Ical4Android +import at.bitfire.ical4android.InvalidCalendarException +import at.bitfire.ical4android.util.TimeApiExtensions.toIcal4jDate +import at.bitfire.ical4android.util.TimeApiExtensions.toIcal4jDateTime +import at.bitfire.ical4android.util.TimeApiExtensions.toLocalDate +import at.bitfire.ical4android.util.TimeApiExtensions.toZoneIdCompat +import net.fortuna.ical4j.model.Date +import net.fortuna.ical4j.model.DateTime +import net.fortuna.ical4j.model.property.DtStart +import net.fortuna.ical4j.model.property.RRule +import java.time.* + +/** + * Sometimes CalendarStorage or servers respond with invalid event definitions. Here we try to + * validate, repair and assume whatever seems appropriate before denying the whole event. + */ +class EventValidator(val e: Event) { + + fun repair() { + val dtStart = correctStartAndEndTime(e) + sameTypeForDtStartAndRruleUntil(dtStart, e.rRules) + removeRRulesWithUntilBeforeDtStart(dtStart, e.rRules) + } + + companion object { + /** + * Ensure proper start and end time + */ + internal fun correctStartAndEndTime(e: Event): DtStart { + val dtStart = e.dtStart ?: throw InvalidCalendarException("Event without start time") + e.dtEnd?.let { dtEnd -> + if (dtStart.date > dtEnd.date) { + Ical4Android.log.warning("DTSTART after DTEND; removing DTEND") + e.dtEnd = null + } + } + return dtStart + } + + /** + * Tries to make the value type of UNTIL and DTSTART the same (both DATE or DATETIME). + */ + internal fun sameTypeForDtStartAndRruleUntil(dtStart: DtStart, rRules: MutableList<RRule>) { + if (DateUtils.isDate(dtStart)) { + for (rRule in rRules) { + rRule.recur.until?.let { until -> + if (until is DateTime) { + Ical4Android.log.warning("DTSTART has DATE, but UNTIL has DATETIME; making UNTIL have DATE only") + rRule.recur.until = until.toLocalDate().toIcal4jDate() + } + } + } + } else if (DateUtils.isDateTime(dtStart)) { + for (rRule in rRules) { + rRule.recur.until?.let { until -> + if (until !is DateTime) { + Ical4Android.log.warning("DTSTART has DATETIME, but UNTIL has DATE; copying time from DTSTART to UNTIL") + val timeZone = if (dtStart.timeZone != null) + dtStart.timeZone.toZoneIdCompat() + else if (dtStart.isUtc) + ZoneOffset.UTC + else /* floating time */ + ZoneId.systemDefault() + rRule.recur.until = + ZonedDateTime.of( + until.toLocalDate(), // date from until + LocalTime.ofInstant(dtStart.date.toInstant(), timeZone), // time from dtStart + timeZone + ).toIcal4jDateTime() + } + } + } + } else + throw InvalidCalendarException("Event with invalid DTSTART value") + } + + /** + * Will remove the RRULES of an event where UNTIL lies before DTSTART + */ + internal fun removeRRulesWithUntilBeforeDtStart(dtStart: DtStart, rRules: MutableList<RRule>) { + val iter = rRules.iterator() + while (iter.hasNext()) { + val rRule = iter.next() + + // drop invalid RRULEs + if (hasUntilBeforeDtStart(dtStart, rRule)) + iter.remove() + } + } + + /** + * Checks whether UNTIL of an RRULE lies before DTSTART + */ + internal fun hasUntilBeforeDtStart(dtStart: DtStart, rRule: RRule): Boolean { + val until = rRule.recur.until ?: return false + return until < dtStart.date + } + } +}
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