Use fancy new player#setPortalCooldown

As discussed in #13
- Also now using Paper repo (spigot repo was too slow to get CB with the
new portalCooldown API)

pom.xml

@@ -7,10 +7,14 @@
     <groupId>me.ryanhamshire</groupId>
     <artifactId>GriefPrevention</artifactId>
     <version>15.2.4</version>
+    <properties>
+        <maven.compiler.source>1.6</maven.compiler.source>
+        <maven.compiler.target>1.6</maven.compiler.target>
+    </properties>
     <repositories>
         <repository>
-            <id>spigot-repo</id>
-            <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
+            <id>paper-repo</id>
+            <url>https://repo.destroystokyo.com/repository/maven-public/</url>
         </repository>
         <repository>
             <id>worldedit-worldguard-repo</id>
@@ -48,8 +52,8 @@
     <dependencies>
         <!--Bukkit API-->
         <dependency>
-                 <groupId>org.bukkit</groupId>
-                 <artifactId>bukkit</artifactId>
+                 <groupId>com.destroystokyo.paper</groupId>
+                 <artifactId>paper-api</artifactId>
                  <version>1.10.2-R0.1-SNAPSHOT</version>
                  <scope>provided</scope>
         </dependency>

src/me/ryanhamshire/GriefPrevention/CheckForPortalTrapTask.java

@@ -52,6 +52,6 @@ class CheckForPortalTrapTask extends BukkitRunnable
 			instance.portalReturnTaskMap.remove(player.getUniqueId());
 			return;
 		}
-		instance.rescuePlayerTrappedInPortal(player);
+		player.setPortalCooldown(0);
 	}
 }

src/me/ryanhamshire/GriefPrevention/GriefPrevention.java

@@ -3609,6 +3609,7 @@ public class GriefPrevention extends JavaPlugin
                !claim.isAdminClaim() && GriefPrevention.instance.config_pvp_noCombatInPlayerLandClaims;
     }
 
+    /*
     protected boolean isPlayerTrappedInPortal(Block block)
 	{
 		Material playerBlock = block.getType();
@@ -3662,14 +3663,13 @@ public class GriefPrevention extends JavaPlugin
 			}
 		}.runTaskLater(this, 600L);
 	}
+	*/
 
-	//remember where players teleport from (via portals) in case they're trapped at the destination
-	ConcurrentHashMap<UUID, Location> portalReturnMap = new ConcurrentHashMap<UUID, Location>();
+	//Track scheduled "rescues" so we can cancel them if the player happens to teleport elsewhere so we can cancel it.
 	ConcurrentHashMap<UUID, BukkitTask> portalReturnTaskMap = new ConcurrentHashMap<UUID, BukkitTask>();
-	public void startRescueTask(Player player, Location rescueLocation)
+	public void startRescueTask(Player player)
 	{
 		BukkitTask task = new CheckForPortalTrapTask(player, this).runTaskLater(GriefPrevention.instance, 600L);
-		portalReturnMap.put(player.getUniqueId(), rescueLocation);
 
 		//Cancel existing rescue task
 		if (portalReturnTaskMap.containsKey(player.getUniqueId()))

src/me/ryanhamshire/GriefPrevention/PlayerData.java

@@ -131,9 +131,6 @@ public class PlayerData
 	//this is an anti-bot strategy.
 	Location noChatLocation = null;
 	
-	//last rescue location, if player was recently rescued (to undo if rescue was unnecessary)
-	Location portalTrappedLocation = null;
-	
 	//ignore list
 	//true means invisible (admin-forced ignore), false means player-created ignore
 	public ConcurrentHashMap<UUID, Boolean> ignoredPlayers = new ConcurrentHashMap<UUID, Boolean>();

src/me/ryanhamshire/GriefPrevention/PlayerEventHandler.java

@@ -763,7 +763,7 @@ class PlayerEventHandler implements Listener
         new IgnoreLoaderThread(playerID, playerData.ignoredPlayers).start();
         
         //is he possibly stuck in a portal frame?
-		instance.rescuePlayerTrappedInPortal(player);
+		player.setPortalCooldown(0);
         
         //if we're holding a logout message for this player, don't send that or this event's join message
         if(GriefPrevention.instance.config_spam_logoutMessageDelaySeconds > 0)
@@ -978,11 +978,10 @@ class PlayerEventHandler implements Listener
         if(!GriefPrevention.instance.claimsEnabledForWorld(event.getTo().getWorld())) return;
 	    
 	    Player player = event.getPlayer();
-	    
         if(event.getCause() == TeleportCause.NETHER_PORTAL)
         {
             //FEATURE: when players get trapped in a nether portal, send them back through to the other side
-			instance.startRescueTask(player, event.getFrom());
+			instance.startRescueTask(player);
         
             //FEATURE: if the player teleporting doesn't have permission to build a nether portal and none already exists at the destination, cancel the teleportation
             if(GriefPrevention.instance.config_claims_portalsRequirePermission)