Package com.aoindustries.servlet.filter

Class StripInvalidXmlCharactersFilter

java.lang.Object

com.aoindustries.servlet.filter.StripInvalidXmlCharactersFilter

All Implemented Interfaces:

Filter

public class StripInvalidXmlCharactersFilter
extends Object
implements Filter

Strips all invalid XML characters on incoming parameters. GET requests on the DispatcherType.REQUEST dispatcher will be 301-redirected to the same URL without the invalid XML characters. All other methods and all other dispatchers, including POST requests, will have the invalid XML characters stripped.

Parameters with invalid names are removed.

This implementation supports UTF-16 surrogate pairs: https://wikipedia.org/wiki/Universal_Character_Set_characters#Surrogates

The allowed characters defined by the specification at https://www.w3.org/TR/xml/#charsets:

Char       ::=          #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]

Only HTTP/HTTPS requests are filtered.

This should be used for both the DispatcherType.REQUEST and DispatcherType.ERROR dispatchers.

Constructor Summary

Constructors

Constructor	Description
StripInvalidXmlCharactersFilter()

Method Summary

Modifier and Type	Method	Description
void	destroy()
void	doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
void	init(FilterConfig config)

Methods inherited from class java.lang.Object

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

Constructor Detail

StripInvalidXmlCharactersFilter

public StripInvalidXmlCharactersFilter()

Method Detail

init

public void init(FilterConfig config)

Specified by:

init in interface Filter

doFilter

public void doFilter(ServletRequest request,
                     ServletResponse response,
                     FilterChain chain)
              throws IOException,
                     ServletException

Specified by:

doFilter in interface Filter

Throws:

IOException

ServletException

destroy

public void destroy()

Specified by:

destroy in interface Filter