/*******************************************************************************
 *     Cloud Foundry 
 *     Copyright (c) [2009-2016] Pivotal Software, Inc. All Rights Reserved.
 *
 *     This product is licensed to you under the Apache License, Version 2.0 (the "License").
 *     You may not use this product except in compliance with the License.
 *
 *     This product includes a number of subcomponents with
 *     separate copyright notices and license terms. Your use of these
 *     subcomponents is subject to the terms and conditions of the
 *     subcomponent's license, as noted in the LICENSE file.
 *******************************************************************************/
package org.cloudfoundry.identity.uaa.authentication.manager;

import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.oauth2.common.exceptions.InvalidTokenException;
import org.springframework.security.oauth2.common.exceptions.OAuth2Exception;
import org.springframework.security.oauth2.provider.OAuth2Authentication;
import org.springframework.security.oauth2.provider.error.OAuth2AuthenticationEntryPoint;
import org.springframework.security.web.AuthenticationEntryPoint;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class ScopeAuthenticationFilter implements Filter {
    private AuthenticationManager authenticationManager;
    private AuthenticationEntryPoint authenticationEntryPoint = new OAuth2AuthenticationEntryPoint();

    public AuthenticationEntryPoint getAuthenticationEntryPoint() {
        return authenticationEntryPoint;
    }

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

    public AuthenticationManager getAuthenticationManager() {
        return authenticationManager;
    }

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

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        try {
            Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
            if (authentication==null || (!(authentication instanceof OAuth2Authentication))) {
                throw new InvalidTokenException("Missing oauth token.");
            }
            authenticationManager.authenticate(authentication);
            chain.doFilter(request,response);
        } catch (OAuth2Exception e) {
            authenticationEntryPoint.commence(
                (HttpServletRequest)request,
                (HttpServletResponse)response,
                new InsufficientAuthenticationException("Insufficient authentication", e));
            SecurityContextHolder.clearContext();
        } catch (AuthenticationException e) {
            authenticationEntryPoint.commence((HttpServletRequest)request,(HttpServletResponse)response,e);
            SecurityContextHolder.clearContext();
        }
    }

    @Override
    public void destroy() {

    }
}