Add config option to allow symbolic links for files.

src/main/java/com/sk89q/worldedit/LocalConfiguration.java

@@ -107,6 +107,7 @@ public abstract class LocalConfiguration {
     public int butcherDefaultRadius = -1;
     public int butcherMaxRadius = -1;
     public boolean allowExtraDataValues = false;
+    public boolean allowSymlinks = false;
 
     /**
      * Loads the configuration.

src/main/java/com/sk89q/worldedit/WorldEdit.java

@@ -825,7 +825,7 @@ public class WorldEdit {
             String filePath = f.getCanonicalPath();
             String dirPath = dir.getCanonicalPath();
 
-            if (!filePath.substring(0, dirPath.length()).equals(dirPath)) {
+            if (!filePath.substring(0, dirPath.length()).equals(dirPath) && !config.allowSymlinks) {
                 throw new FilenameResolutionException(filename,
                         "Path is outside allowable root");
             }

src/main/java/com/sk89q/worldedit/util/YAMLConfiguration.java

@@ -93,6 +93,8 @@ public class YAMLConfiguration extends LocalConfiguration {
 
         saveDir = config.getString("saving.dir", saveDir);
 
+        allowSymlinks = config.getBoolean("files.allow-symbolic-links", false);
+
         disallowedBlocks = new HashSet<Integer>(config.getIntList("limits.disallowed-blocks", null));
 
         allowedDataCycleBlocks = new HashSet<Integer>(config.getIntList("limits.allowed-data-cycle-blocks", null));

src/main/resources/config.yml

@@ -16,6 +16,7 @@
 #
 
 limits:
+    allow-extra-data-values: false
     max-blocks-changed:
         default: -1
         maximum: -1
@@ -56,6 +57,9 @@ scripting:
 saving:
     dir: schematics
 
+files:
+    allow-symbolic-links: false
+
 history:
     size: 15
     expiration: 10