/* (c) 2014 Open Source Geospatial Foundation - all rights reserved
 * (c) 2001 - 2013 OpenPlans
 * This code is licensed under the GPL 2.0 license, available at the root
 * application directory.
 */


package org.geoserver.security;

import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import org.springframework.security.web.util.matcher.RequestMatcher;

/**
 * GeoServer {@link RequestMatcher} implementation.
 * 
 * The  class is responsible for checking against {@link HTTPMethod} objects and
 * the passed {@link RequestMatcher} objects.
 * 
 * @author christian
 *
 */
public  class GeoServerRequestMatcher implements RequestMatcher {

    private Set<HTTPMethod> methods;
    private RequestMatcher[] matchers;
    public GeoServerRequestMatcher(Set<HTTPMethod> methods,RequestMatcher... matchers) {
        this.methods=methods;
//        if (methods !=null && methods.isEmpty())
//            methods=null;
        this.matchers=matchers;
    }
    
    
    /** 
     * First, the HTTP method is checked using {@link #matchesHTTPMethod(HttpServletRequest)}.
     * If <code>true</code>, the request is checked against the {@link RequestMatcher} objects
     * in {@link #matchers}. The first match returns <code>true</code>.
     * 
     * If no match occurs, return <code>false</code>.
     */
    @Override
    public boolean matches(HttpServletRequest request) {
        
        if (matchesHTTPMethod(request)==false)
            return false;
        
        if (matchers==null)
            return false;
        
        for (RequestMatcher matcher : matchers) {
            if (matcher.matches(request))
                return true;
        }
        return false;
    }
    
    /**
     * If {@link #methods} is <code>null</code>, the return
     * value is always <code>true</code>.
     * 
     * Return <code>true</code> if the HTTP method is contained
     * in {@link #methods}
     * 
     * @param request
     *
     */
    protected boolean matchesHTTPMethod(HttpServletRequest request) {
        if (methods==null)
            return true;
        HTTPMethod method = HTTPMethod.fromString(request.getMethod());
        return methods.contains(method);
    }

}