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Mica net is a net framework.
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package org.tio.websocket.server;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.tio.core.ChannelContext;
import org.tio.core.Tio;
import org.tio.core.TioConfig;
import org.tio.core.exception.TioDecodeException;
import org.tio.core.intf.Packet;
import org.tio.http.common.*;
import org.tio.server.intf.TioServerHandler;
import org.tio.utils.hutool.StrUtil;
import org.tio.utils.mica.DigestUtils;
import org.tio.websocket.common.*;
import org.tio.websocket.server.handler.IWsMsgHandler;
import java.nio.ByteBuffer;
import java.util.*;
/**
* @author tanyaowu
*/
public class WsTioServerHandler implements TioServerHandler {
private static final Logger log = LoggerFactory.getLogger(WsTioServerHandler.class);
/**
* value: List
*/
private static final String NOT_FINAL_WEBSOCKET_PACKET_PARTS = "TIO_N_F_W_P_P";
/**
* SEC_WEBSOCKET_KEY后缀
*/
private static final String SEC_WEBSOCKET_KEY_SUFFIX = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
private static final byte[] SEC_WEBSOCKET_KEY_SUFFIX_BYTES = SEC_WEBSOCKET_KEY_SUFFIX.getBytes();
private final IWsMsgHandler wsMsgHandler;
private final HttpConfig wsServerConfig;
public WsTioServerHandler(HttpConfig wsServerConfig, IWsMsgHandler wsMsgHandler) {
this.wsServerConfig = wsServerConfig;
this.wsMsgHandler = wsMsgHandler;
}
/**
* Selects the first matching supported sub protocol
*
* @param requestedSubProtocols 请求中的子协议
* @param subProtocols 系统支持得子协议，注意：不支持 * 通配
* @return First matching supported sub protocol. Null if not found.
*/
private static String selectSubProtocol(String requestedSubProtocols, String[] subProtocols) {
if (requestedSubProtocols == null || subProtocols == null || subProtocols.length == 0) {
return null;
}
String[] requestedSubProtocolArray = requestedSubProtocols.split(",");
for (String p : requestedSubProtocolArray) {
String requestedSubProtocol = p.trim();
for (String supportedSubProtocol : subProtocols) {
if (requestedSubProtocol.equals(supportedSubProtocol)) {
return requestedSubProtocol;
}
}
}
// No match found
return null;
}
@Override
public WsRequest decode(ByteBuffer buffer, int limit, int position, int readableLength, ChannelContext channelContext) throws TioDecodeException {
WsSessionContext wsSessionContext = channelContext.get(WsSessionContext.WS_SESSION_CONTEXT_KEY);
// 尚未握手
if (!wsSessionContext.isHandshaked()) {
HttpRequest request = HttpRequestDecoder.decode(buffer, limit, position, readableLength, channelContext, wsServerConfig);
if (request == null) {
return null;
}
HttpResponse httpResponse = updateWebSocketProtocol(request);
if (httpResponse == null) {
throw new TioDecodeException("http协议升级到websocket协议失败");
}
wsSessionContext.setHandshakeRequest(request);
wsSessionContext.setHandshakeResponse(httpResponse);
WsRequest wsRequestPacket = new WsRequest();
wsRequestPacket.setHandShake(true);
return wsRequestPacket;
}
WsRequest websocketPacket = WsServerDecoder.decode(buffer, channelContext);
if (websocketPacket != null) {
// 数据包尚未完成
if (!websocketPacket.isWsEof()) {
List parts = channelContext.get(NOT_FINAL_WEBSOCKET_PACKET_PARTS);
if (parts == null) {
parts = new ArrayList<>();
channelContext.set(NOT_FINAL_WEBSOCKET_PACKET_PARTS, parts);
}
parts.add(websocketPacket);
} else {
List parts = channelContext.get(NOT_FINAL_WEBSOCKET_PACKET_PARTS);
if (parts != null) {
channelContext.set(NOT_FINAL_WEBSOCKET_PACKET_PARTS, null);
parts.add(websocketPacket);
WsRequest first = parts.get(0);
websocketPacket.setWsOpcode(first.getWsOpcode());
int allBodyLength = 0;
for (WsRequest wsRequest : parts) {
allBodyLength += wsRequest.getBody().length;
}
byte[] allBody = new byte[allBodyLength];
int index = 0;
for (WsRequest wsRequest : parts) {
System.arraycopy(wsRequest.getBody(), 0, allBody, index, wsRequest.getBody().length);
index += wsRequest.getBody().length;
}
websocketPacket.setBody(allBody);
}
HttpRequest handshakeRequest = wsSessionContext.getHandshakeRequest();
if (websocketPacket.getWsOpcode() != Opcode.BINARY) {
byte[] bodyBs = websocketPacket.getBody();
if (bodyBs != null) {
String text = new String(bodyBs, handshakeRequest.getCharset());
websocketPacket.setWsBodyText(text);
}
}
}
}
return websocketPacket;
}
@Override
public ByteBuffer encode(Packet packet, TioConfig tioConfig, ChannelContext channelContext) {
// 处理 websocket 子协议
WsResponse wsResponse;
if (packet instanceof WsResponse) {
wsResponse = (WsResponse) packet;
} else {
wsResponse = wsMsgHandler.encodeSubProtocol(packet, tioConfig, channelContext);
Objects.requireNonNull(wsResponse, "IWsMsgHandler encodeSubProtocol WsResponse is null.");
}
// 握手包
if (wsResponse.isHandShake()) {
WsSessionContext imSessionContext = channelContext.get(WsSessionContext.WS_SESSION_CONTEXT_KEY);
HttpResponse handshakeResponse = imSessionContext.getHandshakeResponse();
return HttpResponseEncoder.encode(handshakeResponse, tioConfig, channelContext);
}
return WsServerEncoder.encode(wsResponse);
}
/**
* @return the httpConfig
*/
public HttpConfig getHttpConfig() {
return wsServerConfig;
}
private WsResponse h(WsRequest websocketPacket, byte[] bytes, Opcode opcode, ChannelContext channelContext) throws Exception {
WsResponse wsResponse;
if (opcode == Opcode.TEXT) {
if (bytes == null || bytes.length == 0) {
return null;
}
String text = new String(bytes, wsServerConfig.getCharset());
Object retObj = wsMsgHandler.onText(websocketPacket, text, channelContext);
String methodName = "onText";
wsResponse = processRetObj(retObj, methodName, channelContext);
return wsResponse;
} else if (opcode == Opcode.BINARY) {
if (bytes == null || bytes.length == 0) {
return null;
}
Object retObj = wsMsgHandler.onBytes(websocketPacket, bytes, channelContext);
String methodName = "onBytes";
wsResponse = processRetObj(retObj, methodName, channelContext);
return wsResponse;
} else if (opcode == Opcode.PING || opcode == Opcode.PONG) {
log.debug("收到:{}", opcode);
return null;
} else if (opcode == Opcode.CLOSE) {
Object retObj = wsMsgHandler.onClose(websocketPacket, bytes, channelContext);
String methodName = "onClose";
wsResponse = processRetObj(retObj, methodName, channelContext);
return wsResponse;
} else {
Tio.remove(channelContext, "错误的websocket包，错误的Opcode");
return null;
}
}
@Override
public void handler(Packet packet, ChannelContext channelContext) throws Exception {
WsRequest wsRequest = (WsRequest) packet;
// 是握手包
if (wsRequest.isHandShake()) {
WsSessionContext wsSessionContext = channelContext.get(WsSessionContext.WS_SESSION_CONTEXT_KEY);
HttpRequest request = wsSessionContext.getHandshakeRequest();
HttpResponse httpResponse = wsSessionContext.getHandshakeResponse();
HttpResponse r = wsMsgHandler.handshake(request, httpResponse, channelContext);
if (r == null) {
Tio.remove(channelContext, "业务层不同意握手");
return;
}
wsSessionContext.setHandshakeResponse(r);
WsResponse wsResponse = new WsResponse();
wsResponse.setHandShake(true);
Tio.send(channelContext, wsResponse);
wsSessionContext.setHandshaked(true);
wsMsgHandler.onAfterHandshaked(request, httpResponse, channelContext);
return;
}
if (!wsRequest.isWsEof()) {
return;
}
WsResponse wsResponse = h(wsRequest, wsRequest.getBody(), wsRequest.getWsOpcode(), channelContext);
if (wsResponse != null) {
Tio.send(channelContext, wsResponse);
}
}
private WsResponse processRetObj(Object obj, String methodName, ChannelContext channelContext) {
WsResponse wsResponse;
if (obj == null) {
return null;
} else {
if (obj instanceof String) {
String str = (String) obj;
wsResponse = WsResponse.fromText(str, wsServerConfig.getCharset());
return wsResponse;
} else if (obj instanceof byte[]) {
wsResponse = WsResponse.fromBytes((byte[]) obj);
return wsResponse;
} else if (obj instanceof WsResponse) {
return (WsResponse) obj;
} else if (obj instanceof ByteBuffer) {
byte[] bs = ((ByteBuffer) obj).array();
wsResponse = WsResponse.fromBytes(bs);
return wsResponse;
} else {
log.error("{} {}.{}()方法，只允许返回byte[]、ByteBuffer、WsResponse或null，但是程序返回了{}", channelContext, this.getClass().getName(), methodName, obj.getClass().getName());
return null;
}
}
}
/**
* 本方法改编自baseio: baseio
* 感谢开源作者的付出
*
* @param request HttpRequest
* @return HttpResponse
* @author tanyaowu
*/
public HttpResponse updateWebSocketProtocol(HttpRequest request) {
Map headers = request.getHeaders();
String secWebSocketKey = headers.get(HttpConst.RequestHeaderKey.Sec_WebSocket_Key);
if (StrUtil.isNotBlank(secWebSocketKey)) {
byte[] secWebSocketKeyBytes = secWebSocketKey.getBytes(request.getCharset());
byte[] allBs = new byte[secWebSocketKeyBytes.length + SEC_WEBSOCKET_KEY_SUFFIX_BYTES.length];
System.arraycopy(secWebSocketKeyBytes, 0, allBs, 0, secWebSocketKeyBytes.length);
System.arraycopy(SEC_WEBSOCKET_KEY_SUFFIX_BYTES, 0, allBs, secWebSocketKeyBytes.length, SEC_WEBSOCKET_KEY_SUFFIX_BYTES.length);
byte[] keyArray = DigestUtils.sha1(allBs);
String acceptKey = Base64.getEncoder().encodeToString(keyArray);
HttpResponse httpResponse = new HttpResponse(request);
// 101 协议转换
httpResponse.setStatus(HttpResponseStatus.C101);
Map respHeaders = new HashMap<>();
respHeaders.put(HeaderName.Connection, HeaderValue.Connection.Upgrade);
respHeaders.put(HeaderName.Upgrade, HeaderValue.Upgrade.WebSocket);
respHeaders.put(HeaderName.Sec_WebSocket_Accept, HeaderValue.from(acceptKey));
// websocket 子协议协商
String[] supportedSubProtocols = wsMsgHandler.getSupportedSubProtocols();
if (supportedSubProtocols != null && supportedSubProtocols.length > 0) {
String requestedSubProtocols = headers.get(HttpConst.RequestHeaderKey.Sec_Websocket_Protocol);
String selectSubProtocol = selectSubProtocol(requestedSubProtocols, supportedSubProtocols);
if (selectSubProtocol != null) {
respHeaders.put(HeaderName.Sec_Websocket_Protocol, HeaderValue.from(selectSubProtocol));
}
}
httpResponse.addHeaders(respHeaders);
return httpResponse;
}
return null;
}
}