eu.trentorise.smartcampus.resourceprovider.filter.ResourceFilter.java Source code

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Here is the source code for eu.trentorise.smartcampus.resourceprovider.filter.ResourceFilter.java

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/**
 *    Copyright 2012-2013 Trento RISE
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package eu.trentorise.smartcampus.resourceprovider.filter;

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.security.authentication.AuthenticationDetailsSource;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.oauth2.common.exceptions.OAuth2Exception;
import org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationDetails;
import org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationDetailsSource;
import org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationProcessingFilter;
import org.springframework.security.oauth2.provider.error.OAuth2AuthenticationEntryPoint;
import org.springframework.security.web.AuthenticationEntryPoint;

import eu.trentorise.smartcampus.resourceprovider.util.HttpMethod;

/**
 * Implementation of the {@link OAuth2AuthenticationProcessingFilter} relying
 * on the {@link ResourceAuthenticationManager} for actual authentication.
 * @author raman
 *
 */
public class ResourceFilter extends OAuth2AuthenticationProcessingFilter {

    private final static Log logger = LogFactory.getLog(ResourceFilter.class);

    private AuthenticationDetailsSource<HttpServletRequest, ?> authenticationDetailsSource = new OAuth2AuthenticationDetailsSource();
    private AuthenticationEntryPoint authenticationEntryPoint = new OAuth2AuthenticationEntryPoint();
    private AuthenticationManager authenticationManager;

    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
            throws IOException, ServletException {

        final boolean debug = logger.isDebugEnabled();
        final HttpServletRequest request = (HttpServletRequest) req;
        final HttpServletResponse response = (HttpServletResponse) res;

        try {

            String tokenValue = parseToken(request);
            if (HttpMethod.OPTIONS.equals(HttpMethod.valueOf(request.getMethod()))) {
                chain.doFilter(request, response);
                //            throw new OAuth2Exception("options");
            } else if (tokenValue == null) {
                if (debug) {
                    logger.debug("No token in request, will continue chain.");
                }
                throw new OAuth2Exception("empty token");
            } else {
                ResourceCallAuthenticationToken authentication = new ResourceCallAuthenticationToken(tokenValue,
                        "");
                request.setAttribute(OAuth2AuthenticationDetails.ACCESS_TOKEN_VALUE, tokenValue);
                authentication.setDetails(authenticationDetailsSource.buildDetails(request));
                authentication.setRequestPath(getFullURL(request));
                authentication.setHttpMethod(HttpMethod.valueOf(request.getMethod()));
                Authentication authResult = authenticationManager.authenticate(authentication);

                SecurityContextHolder.getContext().setAuthentication(authResult);

                chain.doFilter(request, response);

            }
        } catch (OAuth2Exception failed) {
            SecurityContextHolder.clearContext();

            if (debug) {
                logger.debug("Authentication request failed: " + failed);
            }

            authenticationEntryPoint.commence(request, response,
                    new InsufficientAuthenticationException(failed.getMessage(), failed));

            return;
        }

    }

    public String getFullURL(HttpServletRequest request) {
        String cp = request.getContextPath();
        if (cp == null || cp.isEmpty()) {
            return request.getRequestURI();
        }
        return request.getRequestURI().substring(cp.length());
    }

    @Override
    public void setAuthenticationDetailsSource(
            AuthenticationDetailsSource<HttpServletRequest, ?> authenticationDetailsSource) {
        super.setAuthenticationDetailsSource(authenticationDetailsSource);
        this.authenticationDetailsSource = authenticationDetailsSource;
    }

    @Override
    public void setAuthenticationEntryPoint(AuthenticationEntryPoint authenticationEntryPoint) {
        super.setAuthenticationEntryPoint(authenticationEntryPoint);
        this.authenticationEntryPoint = authenticationEntryPoint;
    }

    @Override
    public void setAuthenticationManager(AuthenticationManager authenticationManager) {
        super.setAuthenticationManager(authenticationManager);
        this.authenticationManager = authenticationManager;
    }

}