Remove ambigue method, apply a different default margin, up to the next
block in steps of 0.25, if within 0.35 reach.
Default methods use this correction now, so some places might check with
too high a margin now.
Not entirely sure this will still protect from anything, shortish:
* Remove cancelling due to coarse pre-checks.
* Rather correct the end location back onto the end block somehow.
* Retry ray-tracing with the pitch and yaw of past flying packets.
* Let the direction check handle the off-too-far part and let people
blame that one for remaining amounts of false positives.
Missing:
* Should confine by distance to last move, perhaps.
Use check-specific debug methods for convenience.
Add to: Check, CheckListener, BaseAdapter.
Relay to: CheckUtils.
Side effects:
* Remove constructor: CheckListener().
This is half a guess on base of a request. Hooks can now check if there
are any log actions, or cast IViolationInfo to ViolationData and query
if anything would be logged to a certain stream.
Alterations pending (allow query for multiple streams or just get
streams/configs, what to have in the official API in IViolationInfo).
Untested, unused. Intentions are:
* Be able to count any use of workarounds.
* Confine workarounds to side conditions, such as 'use once until
conditions are reset' and/or 'only use once conditions are set'.
* Have per-player objects and (attached) global counters.
* (Might think of: disable workarounds by configuration.)
(@Samistine).
Slight deviations:
* Random formatting changes.
* Use a linked list for changedCommands at first.
* Use list.clear after iteration, instead of calling remove repeatedly.
* descendingIterator instead of ListIterator + (has+) previous.
* Add mightBeMultipleMoves to MoveData.
* Use a utility method to test for skip_paper, both on setting
vAllowedDistance for vdistrel and in vdistsb.
* Set the skip_paper tag during setting vAllowedDistance for vdistrel,
as that is always run.
* Cancel/alter on lowest.
* Override cancel on set-back on highest.
* Adjust data on monitor.
Partly simplify, e.g. by just cancelling the event (nothing should
happen) - can't recall if there has been a reason to setTo(setBack)
instead of event.setCancelled(true).
* Call both most of the time.
* A convenience measure to have last move ground set, at the cost of
setting it 'too often' (players might not get checked by survivalfly at
all).
* Wrap calls with one PlayerLocation instance, for efficiency.
Move location-dependent properties from MovingData and MoveData to
LocationData.
Rough list of related Changes:
* Represent from and to positions as LocationData inside of MoveData.
* Have flags for onGround, inLiquid and the like in LocationData.
* Change noFallAssumeGround to touchedGroundWorkaround within MoveData.
* Add touchedGround to MoveData (to|from|workaround).
* (Remove involved properties from MovingData and use MoveData.from/to
instead.)
* Use MoveData and LocationData flags instead of PlayerLocation methods
in more places.
* Adjust various special case pre-conditions, based on past move data.
Other changes made on the fly:
* Allow maximum of jump gain and step height for ground -> ground.
* Add envelopes for vDistAir after teleport/join/respawn.
* Add cases for vdistrel.
* Extend logging on teleport (add cause, log set-back too).
* Reorder/fix vdistsb workaround checking.
* Reorder teleport handling.
* Remove small-range workaround for teleport [uncertain effect].
Immediate future follow ups:
* Attempt to only accept PlayerLocation for various setPositions methods
in MovingData (ensure to set MoveData with extra properties +
simplify/cleanup (public) methods with MoveData/LocationData).
* Relate to past move tracking for more workarounds, either to confine
pre-conditions more (inLiquid instead of toWasReset~somehow), or just to
be able to track a false positive at all (thisMove + 2 past moves
needed).
* (Fixes, etc.)
Distant future follow-up:
* Somehow merge with PlayerLocation, e.g. using LocationData inside
PlayerLocation internally, which means changing raw types to Object
versions, just like it's done inside of PlayerLocation right now.
* Possibly PlayerLocation is transformed to static methods with
BlockCache and LocationData as input.
Expected trouble:
* New/old false positives, due to replacing the fromWasReset and
toWasReset by more distinct flags from past move tracking.
* A workaround may have prevented other false positives
unintentionally, e.g. had been intended for liquid, but the
to/fromWasReset flags previously did include ground/noFallAssumeGround,
thus the workaround will not cover that case anymore, after the change.
* Forgetting something like checking touchedGround and to/from.onGround
or similar as a replacement for xyWasReset.
* Mixing up thisMove and lastMove for touchedGround.
* Mixing up touchedGround and touchedGroundWorkaround in MoveData.
This is a first version without any safeguards and without any settings.
A player who has any meta data for 'nocheat.exempt' is regarded exempt
from all checks. Suggestion is a boolean value (true), but setting
anything will do for the moment. Later String values or List<String>
might be supported to allow some kind of generic categories for
exemption (to be discussed with skill plugin developers).
This is not meant for permanent marking, but rather for "extra" events
like area damage with entity.damage(amount, damagerPlayer). The plugin
setting the metadata should also remove the metadata. In order not to
remove all protection by NoCheatPlus, plugins should fire extra events
or cancel events on a higher priority level than EventPriority.LOWEST.
