com.centit.support.security

Class HTMLFilter

java.lang.Object

com.centit.support.security.HTMLFilter

public final class HTMLFilter
extends Object

Refrence : https://github.com/finn-no/xss-html-filter

HTML filtering utility for protecting against XSS (Cross Site Scripting).

This code is licensed LGPLv3

This code is a Java port of the original work in PHP by Cal Hendersen. http://code.iamcal.com/php/lib_filter/

The trickiest part of the translation was handling the differences in regex handling between PHP and Java. These resources were helpful in the process:

http://java.sun.com/j2se/1.4.2/docs/api/java/util/regex/Pattern.html http://us2.php.net/manual/en/reference.pcre.pattern.modifiers.php http://www.regular-expressions.info/modifiers.html

A note on naming conventions: instance variables are prefixed with a "v"; global constants are in all caps.

Sample use: String input = ... String clean = new HTMLFilter().filter( input );

The class is not thread safe. Create a new instance if in doubt.

If you find bugs or have suggestions on improvement (especially regarding performance), please contact us. The latest version of this source, and our contact details, can be found at http://xss-html-filter.sf.net

Author:

Joseph O'Connell, Cal Hendersen, Michael Semb Wever

Constructor Summary

Constructors

Constructor and Description
HTMLFilter() Default constructor.
HTMLFilter(boolean debug) Set debug flag to true.
HTMLFilter(Map<String,Object> conf) Map-parameter configurable constructor.

Method Summary

Modifier and Type	Method and Description
static String	chr(int decimal)
String	filter(String input) given a user submitted input String, filter out any invalid or restricted html.
static String	htmlSpecialChars(String s)
boolean	isAlwaysMakeTags()
boolean	isStripComments()

Methods inherited from class java.lang.Object

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

Constructor Detail

HTMLFilter

public HTMLFilter()

Default constructor.

HTMLFilter

public HTMLFilter(boolean debug)

Set debug flag to true. Otherwise use default settings. See the default constructor.

Parameters:

debug - turn debug on with a true argument

HTMLFilter

public HTMLFilter(Map<String,Object> conf)

Map-parameter configurable constructor.

Parameters:

conf - map containing configuration. keys match field names.

Method Detail

chr

public static String chr(int decimal)

htmlSpecialChars

public static String htmlSpecialChars(String s)

filter

public String filter(String input)

given a user submitted input String, filter out any invalid or restricted html.

Parameters:

input - text (i.e. submitted by a user) than may contain html

Returns:

"clean" version of input, with only valid, whitelisted html elements allowed

isAlwaysMakeTags

public boolean isAlwaysMakeTags()

isStripComments

public boolean isStripComments()