org.zkoss.zsoup.safety

Class Cleaner

java.lang.Object

org.zkoss.zsoup.safety.Cleaner

public class Cleaner
extends Object

The whitelist based HTML cleaner. Use to ensure that end-user provided HTML contains only the elements and attributes that you are expecting; no junk, and no cross-site scripting attacks!

The HTML cleaner parses the input as HTML and then runs it through a white-list, so the output HTML can only contain HTML that is allowed by the whitelist.

It is assumed that the input HTML is a body fragment; the clean methods only pull from the source's body, and the canned white-lists only allow body contained tags.

Rather than interacting directly with a Cleaner object, generally see the clean methods in Zsoup.

Constructor Summary

Constructors

Constructor and Description
Cleaner(Whitelist whitelist) Create a new cleaner, that sanitizes documents using the supplied whitelist.

Method Summary

Modifier and Type	Method and Description
Document	clean(Document dirtyDocument) Creates a new, clean document, from the original dirty document, containing only elements allowed by the whitelist.
boolean	isValid(Document dirtyDocument) Determines if the input document is valid, against the whitelist.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Cleaner

public Cleaner(Whitelist whitelist)

Create a new cleaner, that sanitizes documents using the supplied whitelist.

Parameters:

whitelist - white-list to clean with

Method Detail

clean

public Document clean(Document dirtyDocument)

Creates a new, clean document, from the original dirty document, containing only elements allowed by the whitelist. The original document is not modified. Only elements from the dirt document's body are used.

Parameters:

dirtyDocument - Untrusted base document to clean.

Returns:

cleaned document.

isValid

public boolean isValid(Document dirtyDocument)

Determines if the input document is valid, against the whitelist. It is considered valid if all the tags and attributes in the input HTML are allowed by the whitelist.

This method can be used as a validator for user input forms. An invalid document will still be cleaned successfully using the clean(Document) document. If using as a validator, it is recommended to still clean the document to ensure enforced attributes are set correctly, and that the output is tidied.

Parameters:

dirtyDocument - document to test

Returns:

true if no tags or attributes need to be removed; false if they do