Prevent subfloor melee attacks (#12899)

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

Content.Shared/ActionBlocker/ActionBlockerSystem.cs

@@ -156,7 +156,17 @@ namespace Content.Shared.ActionBlocker
             var ev = new AttackAttemptEvent(uid, target);
             RaiseLocalEvent(uid, ev);
 
-            return !ev.Cancelled;
+            if (ev.Cancelled)
+                return false;
+
+            if (target != null)
+            {
+                var tev = new GettingAttackedAttemptEvent();
+                RaiseLocalEvent(target.Value, ref tev);
+                return !tev.Cancelled;
+            }
+
+            return true;
         }
 
         public bool CanChangeDirection(EntityUid uid)

Content.Shared/Interaction/Events/GettingAttackedAttemptEvent.cs

@@ -0,0 +1,7 @@
+namespace Content.Shared.Interaction.Events;
+
+/// <summary>
+/// Raised directed on the target entity when being attacked.
+/// </summary>
+[ByRefEvent]
+public record struct GettingAttackedAttemptEvent(bool Cancelled);

Content.Shared/SubFloor/SharedSubFloorHideSystem.cs

@@ -31,6 +31,13 @@ namespace Content.Shared.SubFloor
             // Like 80% sure this doesn't need to handle re-anchoring.
             SubscribeLocalEvent<SubFloorHideComponent, AnchorStateChangedEvent>(HandleAnchorChanged);
             SubscribeLocalEvent<SubFloorHideComponent, GettingInteractedWithAttemptEvent>(OnInteractionAttempt);
+            SubscribeLocalEvent<SubFloorHideComponent, GettingAttackedAttemptEvent>(OnAttackAttempt);
+        }
+
+        private void OnAttackAttempt(EntityUid uid, SubFloorHideComponent component, ref GettingAttackedAttemptEvent args)
+        {
+            if (component.BlockInteractions && component.IsUnderCover)
+                args.Cancelled = true;
         }
 
         private void OnInteractionAttempt(EntityUid uid, SubFloorHideComponent component, GettingInteractedWithAttemptEvent args)

Content.Shared/Weapons/Melee/SharedMeleeWeaponSystem.cs

@@ -295,8 +295,21 @@ public abstract class SharedMeleeWeaponSystem : EntitySystem
         if (!CombatMode.IsInCombatMode(user))
             return;
 
-        if (!Blocker.CanAttack(user))
-            return;
+        switch (attack)
+        {
+            case LightAttackEvent light:
+                if (!Blocker.CanAttack(user, light.Target))
+                    return;
+                break;
+            case DisarmAttackEvent disarm:
+                if (!Blocker.CanAttack(user, disarm.Target))
+                    return;
+                break;
+            default:
+                if (!Blocker.CanAttack(user))
+                    return;
+                break;
+        }
 
         // Windup time checked elsewhere.