Fix end portals not being affected by the portals rule type

Fixes #309

src/main/java/xyz/nucleoid/plasmid/mixin/game/rule/BlockPatternMixin.java

@@ -0,0 +1,32 @@
+package xyz.nucleoid.plasmid.mixin.game.rule;
+
+import net.minecraft.block.EndPortalFrameBlock;
+import net.minecraft.block.pattern.BlockPattern;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+import net.minecraft.world.WorldView;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+import xyz.nucleoid.plasmid.impl.game.manager.GameSpaceManagerImpl;
+import xyz.nucleoid.plasmid.api.game.rule.GameRuleType;
+import xyz.nucleoid.stimuli.event.EventResult;
+
+@Mixin(BlockPattern.class)
+public class BlockPatternMixin {
+    @Inject(
+            method = "searchAround",
+            at = @At("HEAD")
+    )
+    private void applyPortalsRuleToEndPortals(WorldView worldView, BlockPos pos, CallbackInfoReturnable<BlockPattern.Result> ci) {
+        if (!(worldView instanceof World world) || ((BlockPattern) (Object) this) != EndPortalFrameBlock.getCompletedFramePattern()) {
+            return;
+        }
+
+        var gameSpace = GameSpaceManagerImpl.get().byWorld(world);
+        if (gameSpace != null && gameSpace.getBehavior().testRule(GameRuleType.PORTALS) == EventResult.DENY) {
+            ci.setReturnValue(null);
+        }
+    }
+}

src/main/resources/plasmid.mixins.json

@@ -10,6 +10,7 @@
     "chat.ServerPlayerEntityMixin",
     "game.portal.EntityMixin",
     "game.portal.SignBlockEntityMixin",
+    "game.rule.BlockPatternMixin",
     "game.rule.EquippableComponentMixin",
     "game.rule.HungerManagerMixin",
     "game.rule.LootTableMixin",