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/*
 * Copyright 2002-2017 the original author or authors.
 *
 * 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 com.github.mthizo247.cloud.netflix.zuul.web.authentication;

import com.github.mthizo247.cloud.netflix.zuul.web.socket.WebSocketHttpHeadersCallback;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.security.oauth2.provider.OAuth2Authentication;
import org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationDetails;
import org.springframework.web.socket.WebSocketHttpHeaders;
import org.springframework.web.socket.WebSocketSession;

import java.security.Principal;
import java.util.Collections;

/**
 * @author Marcin Podlodowski
 */
public class OAuth2BearerPrincipalHeadersCallback implements WebSocketHttpHeadersCallback {
    private final  Log logger = LogFactory.getLog(getClass());

    @Override
    public WebSocketHttpHeaders getWebSocketHttpHeaders(final WebSocketSession userAgentSession) {
        WebSocketHttpHeaders headers = new WebSocketHttpHeaders();
        Principal principal = userAgentSession.getPrincipal();
        if (principal != null && OAuth2Authentication.class.isAssignableFrom(principal.getClass())) {
            OAuth2Authentication oAuth2Authentication = (OAuth2Authentication) principal;
            OAuth2AuthenticationDetails details = (OAuth2AuthenticationDetails) oAuth2Authentication.getDetails();
            String accessToken = details.getTokenValue();
            headers.put(HttpHeaders.AUTHORIZATION, Collections.singletonList("Bearer " + accessToken));
            if(logger.isDebugEnabled()) {
                logger.debug("Added Oauth2 bearer token authentication header for user " +
                        principal.getName() + " to web sockets http headers");
            }
        }
        else {
            if(logger.isDebugEnabled()) {
                logger.debug("Skipped adding basic authentication header since user session principal is null");
            }
        }
        return headers;
    }
}