PathMatchingFilterChainResolver.java

package com.hwlcn.security.web.filter.mgt;

import com.hwlcn.security.util.AntPathMatcher;
import com.hwlcn.security.util.PatternMatcher;
import com.hwlcn.security.web.util.WebUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class PathMatchingFilterChainResolver implements FilterChainResolver {

    private static transient final Logger log = LoggerFactory.getLogger(PathMatchingFilterChainResolver.class);

    private FilterChainManager filterChainManager;

    private PatternMatcher pathMatcher;

    public PathMatchingFilterChainResolver() {
        this.pathMatcher = new AntPathMatcher();
        this.filterChainManager = new DefaultFilterChainManager();
    }

    public PathMatchingFilterChainResolver(FilterConfig filterConfig) {
        this.pathMatcher = new AntPathMatcher();
        this.filterChainManager = new DefaultFilterChainManager(filterConfig);
    }

    public PatternMatcher getPathMatcher() {
        return pathMatcher;
    }

    public void setPathMatcher(PatternMatcher pathMatcher) {
        this.pathMatcher = pathMatcher;
    }

    public FilterChainManager getFilterChainManager() {
        return filterChainManager;
    }

    public void setFilterChainManager(FilterChainManager filterChainManager) {
        this.filterChainManager = filterChainManager;
    }

    public FilterChain getChain(ServletRequest request, ServletResponse response, FilterChain originalChain) {
        FilterChainManager filterChainManager = getFilterChainManager();
        if (!filterChainManager.hasChains()) {
            return null;
        }

        String requestURI = getPathWithinApplication(request);

        for (String pathPattern : filterChainManager.getChainNames()) {

            if (pathMatches(pathPattern, requestURI)) {
                if (log.isTraceEnabled()) {
                    log.trace("Matched path pattern [" + pathPattern + "] for requestURI [" + requestURI + "].  " +
                            "Utilizing corresponding filter chain...");
                }
                return filterChainManager.proxy(originalChain, pathPattern);
            }
        }

        return null;
    }

    protected boolean pathMatches(String pattern, String path) {
        PatternMatcher pathMatcher = getPathMatcher();
        return pathMatcher.matches(pattern, path);
    }

    protected String getPathWithinApplication(ServletRequest request) {
        return WebUtils.getPathWithinApplication(WebUtils.toHttp(request));
    }
}