--- a/net/minecraft/world/level/block/EndGatewayBlock.java
+++ b/net/minecraft/world/level/block/EndGatewayBlock.java
@@ -20,13 +20,17 @@
 import net.minecraft.world.level.material.Fluid;
 import net.minecraft.world.level.portal.DimensionTransition;
 import net.minecraft.world.phys.Vec3;
+// CraftBukkit start
+import org.bukkit.event.player.PlayerTeleportEvent;
+// CraftBukkit end
 
 public class EndGatewayBlock extends BaseEntityBlock implements Portal {
+
     public static final MapCodec<EndGatewayBlock> CODEC = simpleCodec(EndGatewayBlock::new);
 
     @Override
     public MapCodec<EndGatewayBlock> codec() {
-        return CODEC;
+        return EndGatewayBlock.CODEC;
     }
 
     protected EndGatewayBlock(BlockBehaviour.Properties settings) {
@@ -41,35 +45,36 @@
     @Nullable
     @Override
     public <T extends BlockEntity> BlockEntityTicker<T> getTicker(Level world, BlockState state, BlockEntityType<T> type) {
-        return createTickerHelper(
-            type, BlockEntityType.END_GATEWAY, world.isClientSide ? TheEndGatewayBlockEntity::beamAnimationTick : TheEndGatewayBlockEntity::portalTick
-        );
+        return createTickerHelper(type, BlockEntityType.END_GATEWAY, world.isClientSide ? TheEndGatewayBlockEntity::beamAnimationTick : TheEndGatewayBlockEntity::portalTick);
     }
 
     @Override
     public void animateTick(BlockState state, Level world, BlockPos pos, RandomSource random) {
-        BlockEntity blockEntity = world.getBlockEntity(pos);
-        if (blockEntity instanceof TheEndGatewayBlockEntity) {
-            int i = ((TheEndGatewayBlockEntity)blockEntity).getParticleAmount();
+        BlockEntity tileentity = world.getBlockEntity(pos);
+
+        if (tileentity instanceof TheEndGatewayBlockEntity) {
+            int i = ((TheEndGatewayBlockEntity) tileentity).getParticleAmount();
+
+            for (int j = 0; j < i; ++j) {
+                double d0 = (double) pos.getX() + random.nextDouble();
+                double d1 = (double) pos.getY() + random.nextDouble();
+                double d2 = (double) pos.getZ() + random.nextDouble();
+                double d3 = (random.nextDouble() - 0.5D) * 0.5D;
+                double d4 = (random.nextDouble() - 0.5D) * 0.5D;
+                double d5 = (random.nextDouble() - 0.5D) * 0.5D;
+                int k = random.nextInt(2) * 2 - 1;
 
-            for (int j = 0; j < i; j++) {
-                double d = (double)pos.getX() + random.nextDouble();
-                double e = (double)pos.getY() + random.nextDouble();
-                double f = (double)pos.getZ() + random.nextDouble();
-                double g = (random.nextDouble() - 0.5) * 0.5;
-                double h = (random.nextDouble() - 0.5) * 0.5;
-                double k = (random.nextDouble() - 0.5) * 0.5;
-                int l = random.nextInt(2) * 2 - 1;
                 if (random.nextBoolean()) {
-                    f = (double)pos.getZ() + 0.5 + 0.25 * (double)l;
-                    k = (double)(random.nextFloat() * 2.0F * (float)l);
+                    d2 = (double) pos.getZ() + 0.5D + 0.25D * (double) k;
+                    d5 = (double) (random.nextFloat() * 2.0F * (float) k);
                 } else {
-                    d = (double)pos.getX() + 0.5 + 0.25 * (double)l;
-                    g = (double)(random.nextFloat() * 2.0F * (float)l);
+                    d0 = (double) pos.getX() + 0.5D + 0.25D * (double) k;
+                    d3 = (double) (random.nextFloat() * 2.0F * (float) k);
                 }
 
-                world.addParticle(ParticleTypes.PORTAL, d, e, f, g, h, k);
+                world.addParticle(ParticleTypes.PORTAL, d0, d1, d2, d3, d4, d5);
             }
+
         }
     }
 
@@ -85,31 +90,37 @@
 
     @Override
     protected void entityInside(BlockState state, Level world, BlockPos pos, Entity entity) {
-        if (entity.canUsePortal(false)
-            && !world.isClientSide
-            && world.getBlockEntity(pos) instanceof TheEndGatewayBlockEntity theEndGatewayBlockEntity
-            && !theEndGatewayBlockEntity.isCoolingDown()) {
-            entity.setAsInsidePortal(this, pos);
-            TheEndGatewayBlockEntity.triggerCooldown(world, pos, state, theEndGatewayBlockEntity);
+        if (!new io.papermc.paper.event.entity.EntityInsideBlockEvent(entity.getBukkitEntity(), org.bukkit.craftbukkit.block.CraftBlock.at(world, pos)).callEvent()) { return; } // Paper - Add EntityInsideBlockEvent
+        if (entity.canUsePortal(false)) {
+            BlockEntity tileentity = world.getBlockEntity(pos);
+
+            if (!world.isClientSide && tileentity instanceof TheEndGatewayBlockEntity) {
+                TheEndGatewayBlockEntity tileentityendgateway = (TheEndGatewayBlockEntity) tileentity;
+
+                if (!tileentityendgateway.isCoolingDown()) {
+                    entity.setAsInsidePortal(this, pos);
+                    TheEndGatewayBlockEntity.triggerCooldown(world, pos, state, tileentityendgateway);
+                }
+            }
         }
+
     }
 
     @Nullable
     @Override
     public DimensionTransition getPortalDestination(ServerLevel world, Entity entity, BlockPos pos) {
-        if (world.getBlockEntity(pos) instanceof TheEndGatewayBlockEntity theEndGatewayBlockEntity) {
-            Vec3 vec3 = theEndGatewayBlockEntity.getPortalPosition(world, pos);
-            return vec3 != null
-                ? new DimensionTransition(
-                    world, vec3, calculateExitMovement(entity), entity.getYRot(), entity.getXRot(), DimensionTransition.PLACE_PORTAL_TICKET
-                )
-                : null;
+        BlockEntity tileentity = world.getBlockEntity(pos);
+
+        if (tileentity instanceof TheEndGatewayBlockEntity tileentityendgateway) {
+            Vec3 vec3d = tileentityendgateway.getPortalPosition(world, pos);
+
+            return vec3d != null ? new DimensionTransition(world, vec3d, EndGatewayBlock.calculateExitMovement(entity), entity.getYRot(), entity.getXRot(), DimensionTransition.PLACE_PORTAL_TICKET, PlayerTeleportEvent.TeleportCause.END_GATEWAY) : null; // CraftBukkit
         } else {
             return null;
         }
     }
 
     private static Vec3 calculateExitMovement(Entity entity) {
-        return entity instanceof ThrownEnderpearl ? new Vec3(0.0, -1.0, 0.0) : entity.getDeltaMovement();
+        return entity instanceof ThrownEnderpearl ? new Vec3(0.0D, -1.0D, 0.0D) : entity.getDeltaMovement();
     }
 }
