Fixes for offline mode servers

sponge/src/main/java/me/lucko/luckperms/api/sponge/LuckPermsSubject.java

@@ -35,9 +35,7 @@ import me.lucko.luckperms.exceptions.ObjectAlreadyHasException;
 import me.lucko.luckperms.exceptions.ObjectLacksException;
 import me.lucko.luckperms.groups.Group;
 import me.lucko.luckperms.users.User;
-import org.spongepowered.api.Sponge;
 import org.spongepowered.api.command.CommandSource;
-import org.spongepowered.api.entity.living.player.Player;
 import org.spongepowered.api.service.context.Context;
 import org.spongepowered.api.service.permission.Subject;
 import org.spongepowered.api.service.permission.SubjectCollection;
@@ -86,15 +84,6 @@ public class LuckPermsSubject implements Subject {
 
     @Override
     public Optional<CommandSource> getCommandSource() {
-        if (holder instanceof User) {
-            final UUID uuid = ((User) holder).getUuid();
-
-            Optional<Player> p = Sponge.getServer().getPlayer(uuid);
-            if (p.isPresent()) {
-                return Optional.of(p.get());
-            }
-        }
-
         return Optional.empty();
     }
 

sponge/src/main/java/me/lucko/luckperms/api/sponge/LuckPermsUserSubject.java

@@ -26,12 +26,13 @@ import com.google.common.base.Splitter;
 import lombok.Getter;
 import lombok.NonNull;
 import me.lucko.luckperms.users.User;
+import org.spongepowered.api.Sponge;
+import org.spongepowered.api.command.CommandSource;
+import org.spongepowered.api.entity.living.player.Player;
 import org.spongepowered.api.service.context.Context;
 import org.spongepowered.api.util.Tristate;
 
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Set;
+import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
 
 public class LuckPermsUserSubject extends LuckPermsSubject {
@@ -109,4 +110,21 @@ public class LuckPermsUserSubject extends LuckPermsSubject {
 
         return service.getDefaults().getPermissionValue(contexts, permission);
     }
+
+    @Override
+    public String getIdentifier() {
+        return service.getPlugin().getUuidCache().getExternalUUID(user.getUuid()).toString();
+    }
+
+    @Override
+    public Optional<CommandSource> getCommandSource() {
+        final UUID uuid = service.getPlugin().getUuidCache().getExternalUUID(user.getUuid());
+
+        Optional<Player> p = Sponge.getServer().getPlayer(uuid);
+        if (p.isPresent()) {
+            return Optional.of(p.get());
+        }
+
+        return Optional.empty();
+    }
 }

sponge/src/main/java/me/lucko/luckperms/api/sponge/collections/UserCollection.java

@@ -61,22 +61,23 @@ public class UserCollection implements SubjectCollection {
     }
 
     private void load(UUID uuid) {
-        if (!manager.isLoaded(uuid)) {
+        UUID internal = service.getPlugin().getUuidCache().getUUID(uuid);
+        if (!manager.isLoaded(internal)) {
             return;
         }
 
-        User user = manager.get(uuid);
-        users.put(uuid, LuckPermsUserSubject.wrapUser(user, service));
+        User user = manager.get(internal);
+        users.put(internal, LuckPermsUserSubject.wrapUser(user, service));
     }
 
     public void unload(UUID uuid) {
-        users.remove(uuid);
+        users.remove(service.getPlugin().getUuidCache().getUUID(uuid));
     }
 
     @Override
     public synchronized Subject get(@NonNull String id) {
         try {
-            UUID u = UUID.fromString(id);
+            UUID u = service.getPlugin().getUuidCache().getUUID(UUID.fromString(id));
             if (users.containsKey(u)) {
                 return users.get(u);
             }
@@ -105,7 +106,7 @@ public class UserCollection implements SubjectCollection {
     public boolean hasRegistered(@NonNull String id) {
         try {
             UUID u = UUID.fromString(id);
-            return manager.isLoaded(u);
+            return manager.isLoaded(service.getPlugin().getUuidCache().getUUID(u));
         } catch (IllegalArgumentException e) {
             User user = manager.get(id);
             return user != null;