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/*
 * INSERT COPYRIGHT HERE
 */

package com.wadpam.open.security;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

/**
 *
 * @author sosandstrom
 */
public class RolesInterceptor extends HandlerInterceptorAdapter {
    
    static final Logger LOG = LoggerFactory.getLogger(RolesInterceptor.class);

    // Paths
    private final ArrayList>> RULED_METHODS = 
            new ArrayList>>();
    
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object principal = request.getAttribute(SecurityInterceptor.ATTR_NAME_PRINCIPAL);
        if (null != principal) {
            
            // this will be empty list, never null
            final Collection grantedRoles = (Collection) request.getAttribute(SecurityInterceptor.ATTR_NAME_ROLES);
            
            // build the method:path String
            final String method = SecurityInterceptor.getEffectiveMethod(request);
            final String requestUri = request.getRequestURI();

            final boolean authorized = isAuthorized(RULED_METHODS, method, requestUri, grantedRoles);
            if (authorized) {
                return true;
            }
        }
        
        response.sendError(HttpStatus.FORBIDDEN.value(), HttpStatus.FORBIDDEN.getReasonPhrase());
        return false;
    }

    protected static boolean isAuthorized(ArrayList>> RULED_METHODS, String method, String requestUri, Collection grantedRoles) {
        final String methodPath = String.format("%s:%s", method, requestUri);
        LOG.debug("method:requestUri = {}, Granted Roles: {}", methodPath, grantedRoles);

        // iterate the list top-down to find matching method:path
        Matcher matcher;
        boolean matches;
        for (Map.Entry> entry : RULED_METHODS) {
            matcher = entry.getKey().matcher(methodPath);
            matches = matcher.find();
            LOG.debug("-   {} for {}", matches, entry.getKey());

            if (matches) {
                final Set authorizedRoles = entry.getValue();
                LOG.debug("-   Authorized Roles: {}", authorizedRoles);

                // disjoint is true if the two specified collections have no elements in common.
                boolean disjoint = Collections.disjoint(grantedRoles, authorizedRoles);
                if (!disjoint) {

                    // at least one role in common means Authorized:
                    return true;
                }

                // match && no elements in common - Forbidden
                break;
            }
        }
        return false;
    }
    
    public void setRuledMethods(Collection>> ruledMethods) {
        SecurityInterceptor.setListedMethods(ruledMethods, RULED_METHODS);
    }
}