fix(#456): fix default charset problem

Signed-off-by: GodMeowIceSun <[email protected]>

src/main/java/org/owasp/validator/html/CleanResults.java

@@ -25,10 +25,14 @@
 
 package org.owasp.validator.html;
 
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.Callable;
+import java.util.stream.Collectors;
+
 import org.w3c.dom.DocumentFragment;
 
 /**
@@ -163,7 +167,22 @@ public DocumentFragment getCleanXMLDocumentFragment() {
    * @see #getCleanHTML()
    */
   public List<String> getErrorMessages() {
-    return errorMessages;
+    return getErrorMessages(Charset.defaultCharset());
+  }
+
+  /**
+   * Return a list of error messages -- but an empty list returned does not mean there was no attack
+   * present, due to the serialization and deserialization process automatically cleaning up some
+   * attacks. Only the output of the {@code getCleanHTML()} should be considered safe. See the
+   * project README file and {@code CleanResults} class documentation for further discussion.
+   *
+   * @param charset - The character set for returning error messages.
+   * @return An ArrayList object which contains the error messages, if any, after a scan.
+   * @see <a href="https://github.com/nahsra/antisamy/blob/main/README.md">Project README</a>
+   * @see #getCleanHTML()
+   */
+  public List<String> getErrorMessages(Charset charset) {
+    return Collections.unmodifiableList(errorMessages.stream().map(i->new String(i.getBytes(StandardCharsets.ISO_8859_1), charset)).collect(Collectors.toList()));
   }
 
   /**