Indicate when a teleport event was triggered by ender pearls or unknown internal teleports

src/main/java/net/minecraft/server/EntityEnderPearl.java

@@ -3,6 +3,8 @@ package net.minecraft.server;
 import org.bukkit.Bukkit;
 import org.bukkit.craftbukkit.entity.CraftPlayer;
 import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.player.PlayerPortalEvent;
+import org.bukkit.event.player.PlayerTeleportEvent;
 
 public class EntityEnderPearl extends EntityProjectile {
     public EntityEnderPearl(World world) {
@@ -28,23 +30,36 @@ public class EntityEnderPearl extends EntityProjectile {
 
         if (!this.world.isStatic) {
             // CraftBukkit start - dupe fix + damage event
-            boolean damage = false;
+            boolean teleport = false;
+            PlayerTeleportEvent teleEvent = null;
+
             if (this.shooter != null) {
                 if (this.shooter instanceof EntityPlayer) {
-                    damage = ((CraftPlayer)this.shooter.bukkitEntity).isOnline();
+                    CraftPlayer player = (CraftPlayer)this.shooter.bukkitEntity;
+                    teleport = player.isOnline();
+                    
+                    if (teleport) {
+                        teleEvent = new PlayerTeleportEvent(player, player.getLocation(), getBukkitEntity().getLocation(), PlayerTeleportEvent.TeleportCause.ENDER_PEARL);
+                        Bukkit.getPluginManager().callEvent(teleEvent);
+                        teleport = !teleEvent.isCancelled();
+                    }
                 } else {
-                    damage = true;
+                    teleport = true;
                 }
             }
 
-            if (damage) {
+            if (teleport) {
+                if (this.shooter instanceof EntityPlayer) {
+                    ((EntityPlayer)this.shooter).netServerHandler.teleport(teleEvent.getTo());
+                } else {
                     this.shooter.a_(this.locX, this.locY, this.locZ);
+                }
                 this.shooter.fallDistance = 0.0F;
-                EntityDamageEvent event = new EntityDamageEvent(getBukkitEntity(), EntityDamageEvent.DamageCause.FALL, 5);
-                Bukkit.getPluginManager().callEvent(event);
+                EntityDamageEvent damageEvent = new EntityDamageEvent(getBukkitEntity(), EntityDamageEvent.DamageCause.FALL, 5);
+                Bukkit.getPluginManager().callEvent(damageEvent);
 
-                if (!event.isCancelled()) {
-                    this.shooter.damageEntity(DamageSource.FALL, event.getDamage());
+                if (!damageEvent.isCancelled()) {
+                    this.shooter.damageEntity(DamageSource.FALL, damageEvent.getDamage());
                 }
             }
             // CraftBukkit end

src/main/java/net/minecraft/server/NetServerHandler.java

@@ -190,7 +190,7 @@ public class NetServerHandler extends NetHandler implements ICommandListener {
                     there to avoid any 'Moved wrongly' or 'Moved too quickly' errors.
                     We only do this if the Event was not cancelled. */
                     if (!to.equals(event.getTo()) && !event.isCancelled()) {
-                        this.player.getBukkitEntity().teleport(event.getTo());
+                        this.player.getBukkitEntity().teleport(event.getTo(), PlayerTeleportEvent.TeleportCause.UNKNOWN);
                         return;
                     }
 
@@ -204,7 +204,7 @@ public class NetServerHandler extends NetHandler implements ICommandListener {
             }
 
             if (Double.isNaN(packet10flying.x) || Double.isNaN(packet10flying.y) || Double.isNaN(packet10flying.z) || Double.isNaN(packet10flying.stance)) {
-                player.teleport(player.getWorld().getSpawnLocation());
+                player.teleport(player.getWorld().getSpawnLocation(), PlayerTeleportEvent.TeleportCause.UNKNOWN);
                 System.err.println(player.getName() + " was caught trying to crash the server with an invalid position.");
                 player.kickPlayer("Nope!");
                 return;
@@ -386,7 +386,7 @@ public class NetServerHandler extends NetHandler implements ICommandListener {
         Player player = this.getPlayer();
         Location from = player.getLocation();
         Location to = new Location(this.getPlayer().getWorld(), d0, d1, d2, f, f1);
-        PlayerTeleportEvent event = new PlayerTeleportEvent(player, from, to);
+        PlayerTeleportEvent event = new PlayerTeleportEvent(player, from, to, PlayerTeleportEvent.TeleportCause.UNKNOWN);
         this.server.getPluginManager().callEvent(event);
 
         from = event.getFrom();

src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java

@@ -15,6 +15,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.UUID;
 import org.bukkit.Bukkit;
+import org.bukkit.event.player.PlayerTeleportEvent.TeleportCause;
 
 public abstract class CraftEntity implements org.bukkit.entity.Entity {
     private static final Map<String, CraftPlayer> players = new MapMaker().softValues().makeMap();
@@ -152,6 +153,10 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
     }
 
     public boolean teleport(Location location) {
+        return teleport(this, TeleportCause.PLUGIN);
+    }
+
+    public boolean teleport(Location location, TeleportCause cause) {
         entity.world = ((CraftWorld) location.getWorld()).getHandle();
         entity.setLocation(location.getX(), location.getY(), location.getZ(), location.getYaw(), location.getPitch());
         // entity.setLocation() throws no event, and so cannot be cancelled
@@ -162,6 +167,10 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
         return teleport(destination.getLocation());
     }
 
+    public boolean teleport(org.bukkit.entity.Entity destination, TeleportCause cause) {
+        return teleport(destination.getLocation(), cause);
+    }
+
     public List<org.bukkit.entity.Entity> getNearbyEntities(double x, double y, double z) {
         @SuppressWarnings("unchecked")
         List<Entity> notchEntityList = entity.world.b(entity, entity.boundingBox.b(x, y, z));

src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java

@@ -86,10 +86,12 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         }
     }
 
+    @Override
     public double getEyeHeight() {
         return getEyeHeight(false);
     }
 
+    @Override
     public double getEyeHeight(boolean ignoreSneaking) {
         if (ignoreSneaking) {
             return 1.62D;
@@ -274,7 +276,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
     }
 
     @Override
-    public boolean teleport(Location location) {
+    public boolean teleport(Location location, PlayerTeleportEvent.TeleportCause cause) {
         if (getHandle().netServerHandler == null) return false;
 
         // From = Players current Location
@@ -282,7 +284,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         // To = Players new Location if Teleport is Successful
         Location to = location;
         // Create & Call the Teleport Event.
-        PlayerTeleportEvent event = new PlayerTeleportEvent((Player) this, from, to);
+        PlayerTeleportEvent event = new PlayerTeleportEvent((Player) this, from, to, cause);
         server.getPluginManager().callEvent(event);
         // Return False to inform the Plugin that the Teleport was unsuccessful/cancelled.
         if (event.isCancelled() == true) {