Added a permission node to set NBT data, allowing servers to disallow NBT interactions.

worldedit-core/src/main/java/com/sk89q/worldedit/LocalSession.java

@@ -232,6 +232,9 @@ public class LocalSession {
                 newEditSession.enableStandardMode();
                 newEditSession.setReorderMode(reorderMode);
                 newEditSession.setFastMode(fastMode);
+                if (newEditSession.getSurvivalExtent() != null) {
+                    newEditSession.getSurvivalExtent().setStripNbt(!player.hasPermission("worldedit.setnbt"));
+                }
                 editSession.undo(newEditSession);
             }
             return editSession;
@@ -257,6 +260,9 @@ public class LocalSession {
                 newEditSession.enableStandardMode();
                 newEditSession.setReorderMode(reorderMode);
                 newEditSession.setFastMode(fastMode);
+                if (newEditSession.getSurvivalExtent() != null) {
+                    newEditSession.getSurvivalExtent().setStripNbt(!player.hasPermission("worldedit.setnbt"));
+                }
                 editSession.redo(newEditSession);
             }
             ++historyPointer;
@@ -887,6 +893,9 @@ public class LocalSession {
         editSession.setFastMode(fastMode);
         editSession.setReorderMode(reorderMode);
         editSession.setMask(mask);
+        if (editSession.getSurvivalExtent() != null) {
+            editSession.getSurvivalExtent().setStripNbt(!player.hasPermission("worldedit.setnbt"));
+        }
 
         return editSession;
     }

worldedit-core/src/main/java/com/sk89q/worldedit/extent/world/SurvivalModeExtent.java

@@ -40,6 +40,7 @@ public class SurvivalModeExtent extends AbstractDelegateExtent {
 
     private final World world;
     private boolean toolUse = false;
+    private boolean stripNbt = false;
 
     /**
      * Create a new instance.
@@ -78,13 +79,26 @@ public class SurvivalModeExtent extends AbstractDelegateExtent {
         this.toolUse = toolUse;
     }
 
+    public boolean hasStripNbt() {
+        return stripNbt;
+    }
+
+    public void setStripNbt(boolean stripNbt) {
+        this.stripNbt = stripNbt;
+    }
+
     @Override
     public <B extends BlockStateHolder<B>> boolean setBlock(BlockVector3 location, B block) throws WorldEditException {
         if (toolUse && block.getBlockType().getMaterial().isAir()) {
             world.simulateBlockMine(location);
             return true;
         } else {
-            return super.setBlock(location, block);
+            // Can't be an inlined check due to inconsistent generic return type
+            if (stripNbt) {
+                return super.setBlock(location, block.toBaseBlock(null));
+            } else {
+                return super.setBlock(location, block);
+            }
         }
     }