1 files changed, 36 insertions, 0 deletions
diff --git a/vespajlib/src/main/java/ai/vespa/validation/PathValidator.java b/vespajlib/src/main/java/ai/vespa/validation/PathValidator.java
new file mode 100644
index 00000000000..0ae81e2315d
--- /dev/null
+++ b/vespajlib/src/main/java/ai/vespa/validation/PathValidator.java
@@ -0,0 +1,36 @@
+package ai.vespa.validation;
+
+import java.nio.file.Path;
+
+/**
+ * Path validations
+ *
+ * @author mortent
+ */
+public class PathValidator {
+
+    /**
+     * Validate that file is a child of basedir
+     * @param root Root directory to use for validation
+     * @param path Path to validate
+     * @throws IllegalArgumentException if path is not a child of root
+     */
+    public static void validateChildOf(Path root, Path path) {
+        if (!path.normalize().startsWith(root)) {
+            throw new IllegalArgumentException("Invalid path %s".formatted(path));
+        }
+    }
+
+    /**
+     * Resolves a path under a root path
+     * @param root root poth
+     * @param path child to resolve
+     * @return The resolved path
+     * @throws IllegalArgumentException If the provided child path does not resolve as child of root
+     */
+    public static Path resolveChildOf(Path root, String path) {
+        Path resolved = root.resolve(path);
+        validateChildOf(root, resolved);
+        return resolved;
+    }
+}