Add the spectate entities rule

README.md

@@ -23,6 +23,7 @@ Leukocyte provides various rules that can be applied within authorities. These r
  - `interact` controls global interaction over blocks and entities
  - `attack` controls whether players can attack other entities
  - `pvp` controls whether players can attack other players
+ - `spectate_entities` controls whether players can spectate entities from the entity's perspective in spectator mode
  - `portals` controls whether players can construct portals
  - `crafting` controls whether players can craft items
  - `fall_damage` controls whether players should receive fall damage

src/main/java/xyz/nucleoid/leukocyte/rule/ProtectionRule.java

@@ -22,6 +22,7 @@ public final class ProtectionRule {
 
     public static final ProtectionRule ATTACK = register("attack");
     public static final ProtectionRule PVP = register("pvp");
+    public static final ProtectionRule SPECTATE_ENTITIES = register("spectate_entities");
 
     public static final ProtectionRule PORTALS = register("portals");
     public static final ProtectionRule CRAFTING = register("crafting");

src/main/java/xyz/nucleoid/leukocyte/rule/enforcer/LeukocyteRuleEnforcer.java

@@ -31,6 +31,7 @@
 import xyz.nucleoid.stimuli.event.player.PlayerConsumeHungerEvent;
 import xyz.nucleoid.stimuli.event.player.PlayerDamageEvent;
 import xyz.nucleoid.stimuli.event.player.PlayerRegenerateEvent;
+import xyz.nucleoid.stimuli.event.player.PlayerSpectateEntityEvent;
 import xyz.nucleoid.stimuli.event.world.*;
 
 import java.util.ArrayList;
@@ -54,6 +55,9 @@ public void applyTo(ProtectionRuleMap rules, EventRegistrar events) {
                     return attacked instanceof PlayerEntity ? rule : ActionResult.PASS;
                 });
 
+        this.forRule(events, rules.test(ProtectionRule.SPECTATE_ENTITIES))
+                .applySimple(PlayerSpectateEntityEvent.EVENT, rule -> (player, target) -> rule);
+
         this.forRule(events, rules.test(ProtectionRule.CRAFTING))
                 .applySimple(ItemCraftEvent.EVENT, rule -> (player, recipe) -> rule);