FilterConfig filterConfig = null;
private List
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}
public void destroy() {
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
String servletPath = httpServletRequest.getServletPath();
if (urlExclusion ! = null && urlExclusion.contains(servletPath)) {
chain.doFilter(request, response);
} else {
chain.doFilter(new XssHttpServletRequestWrapper((HttpServletRequest) request), response);
}
}
public List
return urlExclusion;
}
public void setUrlExclusion(List
this.urlExclusion = urlExclusion;
}
}public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
public XssHttpServletRequestWrapper(HttpServletRequest servletRequest) {
super(servletRequest);
}
public String[] getParameterValues(String parameter) {
String[] values = super.getParameterValues(parameter);
if (values == null) {
return null;
}
int count = values.length;
String[] encodedValues = new String[count];
for (int i = 0; i < count; i++) { encodedValues[i] = cleanXSS(values[i]); } return encodedValues; } public String getParameter(String parameter) { String value = super.getParameter(parameter); if (value == null) { return null; } return cleanXSS(value); } public String getHeader(String name) { String value = super.getHeader(name); if (value == null) return null; return cleanXSS(value); } private String cleanXSS(String value) { //You'll need to remove the spaces from the html entities below value = value.replaceAll("<", "& lt;").replaceAll(">", "& gt; ");
value = value.replaceAll("(", "& #40;" ).replaceAll(")", "& #41;" );
value = value.replaceAll("’", "& #39; ");
value = value.replaceAll("eval((.*))", "");
value = value.replaceAll("["’][s]*javascript:(.*)["’]", """");
value = value.replaceAll("script", "");
return value;
}
}2. web.xml adds filter configuration.