/*
    * Copyright 2002-2014 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 org.springframework.web.socket.adapter.standard;
  
  import java.io.IOException;
  import java.net.InetSocketAddress;
  import java.net.URI;
  import java.security.Principal;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import javax.websocket.CloseReason;
  import javax.websocket.CloseReason.CloseCodes;
  import javax.websocket.Extension;
  import javax.websocket.Session;
  
  import org.springframework.http.HttpHeaders;
  import org.springframework.web.socket.BinaryMessage;
  import org.springframework.web.socket.CloseStatus;
  import org.springframework.web.socket.PingMessage;
  import org.springframework.web.socket.PongMessage;
  import org.springframework.web.socket.TextMessage;
  import org.springframework.web.socket.WebSocketExtension;
  import org.springframework.web.socket.WebSocketSession;
  import org.springframework.web.socket.adapter.AbstractWebSocketSession;
  
  /**
   * A {@link WebSocketSession} for use with the standard WebSocket for Java API.
   *
   * @author Rossen Stoyanchev
   * @since 4.0
   */
  public class StandardWebSocketSession extends AbstractWebSocketSession<Session> {
  
  	private String id;
  
  	private URI uri;
  
  	private final HttpHeaders handshakeHeaders;
  
  	private String acceptedProtocol;
  
  	private List<WebSocketExtension> extensions;
  
  	private Principal user;
  
  	private final InetSocketAddress localAddress;
  
  	private final InetSocketAddress remoteAddress;
  
  
  	/**
  	 * Class constructor.
  	 *
  	 * @param headers the headers of the handshake request
  	 * @param attributes attributes from the HTTP handshake to associate with the WebSocket
  	 * session; the provided attributes are copied, the original map is not used.
  	 * @param localAddress the address on which the request was received
  	 * @param remoteAddress the address of the remote client
  	 */
  	public StandardWebSocketSession(HttpHeaders headers, Map<String, Object> attributes,
  			InetSocketAddress localAddress, InetSocketAddress remoteAddress) {
  
  		this(headers, attributes, localAddress, remoteAddress, null);
  	}
  
  	/**
  	 * Class constructor that associates a user with the WebSocket session.
  	 *
  	 * @param headers the headers of the handshake request
  	 * @param attributes attributes from the HTTP handshake to associate with the WebSocket session
  	 * @param localAddress the address on which the request was received
  	 * @param remoteAddress the address of the remote client
  	 * @param user the user associated with the session; if {@code null} we'll
  	 * 	fallback on the user available in the underlying WebSocket session
  	 */
  	public StandardWebSocketSession(HttpHeaders headers, Map<String, Object> attributes,
  			InetSocketAddress localAddress, InetSocketAddress remoteAddress, Principal user) {
  
  		super(attributes);
  		headers = (headers != null) ? headers : new HttpHeaders();
  		this.handshakeHeaders = HttpHeaders.readOnlyHttpHeaders(headers);
  		this.user = user;
  		this.localAddress = localAddress;
  		this.remoteAddress = remoteAddress;
 	}
 
 
 	@Override
 	public String getId() {
 		checkNativeSessionInitialized();
 		return this.id;
 	}
 
 	@Override
 	public URI getUri() {
 		checkNativeSessionInitialized();
 		return this.uri;
 	}
 
 	@Override
 	public HttpHeaders getHandshakeHeaders() {
 		return this.handshakeHeaders;
 	}
 
 	@Override
 	public String getAcceptedProtocol() {
 		checkNativeSessionInitialized();
 		return this.acceptedProtocol;
 	}
 
 	@Override
 	public List<WebSocketExtension> getExtensions() {
 		checkNativeSessionInitialized();
 		return this.extensions;
 	}
 
 	public Principal getPrincipal() {
 		return this.user;
 	}
 
 	@Override
 	public InetSocketAddress getLocalAddress() {
 		return this.localAddress;
 	}
 
 	@Override
 	public InetSocketAddress getRemoteAddress() {
 		return this.remoteAddress;
 	}
 
 	@Override
 	public void setTextMessageSizeLimit(int messageSizeLimit) {
 		checkNativeSessionInitialized();
 		getNativeSession().setMaxTextMessageBufferSize(messageSizeLimit);
 	}
 
 	@Override
 	public int getTextMessageSizeLimit() {
 		checkNativeSessionInitialized();
 		return getNativeSession().getMaxTextMessageBufferSize();
 	}
 
 	@Override
 	public void setBinaryMessageSizeLimit(int messageSizeLimit) {
 		checkNativeSessionInitialized();
 		getNativeSession().setMaxBinaryMessageBufferSize(messageSizeLimit);
 	}
 
 	@Override
 	public int getBinaryMessageSizeLimit() {
 		checkNativeSessionInitialized();
 		return getNativeSession().getMaxBinaryMessageBufferSize();
 	}
 
 	@Override
 	public boolean isOpen() {
 		return (getNativeSession() != null && getNativeSession().isOpen());
 	}
 
 	@Override
 	public void initializeNativeSession(Session session) {
 		super.initializeNativeSession(session);
 
 		this.id = session.getId();
 		this.uri = session.getRequestURI();
 
 		this.acceptedProtocol = session.getNegotiatedSubprotocol();
 
 		List<Extension> source = getNativeSession().getNegotiatedExtensions();
 		this.extensions = new ArrayList<WebSocketExtension>(source.size());
 		for (Extension ext : source) {
 			this.extensions.add(new StandardToWebSocketExtensionAdapter(ext));
 		}
 
 		if (this.user == null) {
 			this.user = session.getUserPrincipal();
 		}
 	}
 
 	@Override
 	protected void sendTextMessage(TextMessage message) throws IOException {
 		getNativeSession().getBasicRemote().sendText(message.getPayload(), message.isLast());
 	}
 
 	@Override
 	protected void sendBinaryMessage(BinaryMessage message) throws IOException {
 		getNativeSession().getBasicRemote().sendBinary(message.getPayload(), message.isLast());
 	}
 
 	@Override
 	protected void sendPingMessage(PingMessage message) throws IOException {
 		getNativeSession().getBasicRemote().sendPing(message.getPayload());
 	}
 
 	@Override
 	protected void sendPongMessage(PongMessage message) throws IOException {
 		getNativeSession().getBasicRemote().sendPong(message.getPayload());
 	}
 
 	@Override
 	protected void closeInternal(CloseStatus status) throws IOException {
 		getNativeSession().close(new CloseReason(CloseCodes.getCloseCode(status.getCode()), status.getReason()));
 	}
 
 }