Initial version of chat.

.gitignore

@@ -0,0 +1,26 @@
+.gradle
+/build/
+!gradle/wrapper/gradle-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+.nb-gradle/
+out

build.gradle

@@ -0,0 +1,31 @@
+buildscript {
+	ext {
+		springBootVersion = '1.5.6.RELEASE'
+	}
+	repositories {
+		mavenCentral()
+	}
+	dependencies {
+		classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
+	}
+}
+
+apply plugin: 'java'
+apply plugin: 'eclipse'
+apply plugin: 'org.springframework.boot'
+
+version = '0.0.1-SNAPSHOT'
+sourceCompatibility = 1.8
+
+repositories {
+	mavenCentral()
+}
+
+
+dependencies {
+	compile('org.springframework.boot:spring-boot-starter-jersey')
+	compile('org.springframework.boot:spring-boot-starter-web')
+	compile('org.springframework.boot:spring-boot-starter-websocket')
+	compile('org.webjars:sockjs-client:0.3.4')
+	testCompile('org.springframework.boot:spring-boot-starter-test')
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.5.1-bin.zip

gradlew

@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save ( ) {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

src/main/java/pl/polgrabiat/websockets/chat/websocketschat/WebsocketsChatApplication.java

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+package pl.polgrabiat.websockets.chat.websocketschat;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class WebsocketsChatApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(WebsocketsChatApplication.class, args);
+	}
+}

src/main/java/pl/polgrabiat/websockets/chat/websocketschat/configs/WebsocketConfig.java

@@ -0,0 +1,22 @@
+package pl.polgrabiat.websockets.chat.websocketschat.configs;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.socket.config.annotation.EnableWebSocket;
+import org.springframework.web.socket.config.annotation.WebSocketConfigurer;
+import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;
+import pl.polgrabiat.websockets.chat.websocketschat.handlers.ChatWebsocketHandler;
+
+import javax.inject.Inject;
+
+@Configuration
+@EnableWebSocket
+public class WebsocketConfig implements WebSocketConfigurer {
+
+    @Inject
+    private ChatWebsocketHandler websocketController;
+
+    @Override
+    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
+        registry.addHandler(websocketController,"/chat").withSockJS();
+    }
+}

src/main/java/pl/polgrabiat/websockets/chat/websocketschat/dto/ChannelCtx.java

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+package pl.polgrabiat.websockets.chat.websocketschat.dto;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class ChannelCtx {
+    private String name;
+    private Set<UserCtx> users = new HashSet<>();
+    private Set<ChannelMode> modes = new HashSet<>();
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Set<UserCtx> getUsers() {
+        return users;
+    }
+
+    public void setUsers(Set<UserCtx> users) {
+        this.users = users;
+    }
+
+    public Set<ChannelMode> getModes() {
+        return modes;
+    }
+
+    public void setModes(Set<ChannelMode> modes) {
+        this.modes = modes;
+    }
+}

src/main/java/pl/polgrabiat/websockets/chat/websocketschat/dto/ChannelMode.java

@@ -0,0 +1,24 @@
+package pl.polgrabiat.websockets.chat.websocketschat.dto;
+
+import java.util.Arrays;
+import java.util.Optional;
+
+public enum ChannelMode {
+    PRIVATE("priv"),
+    PASSWORD_PROTECTED("pass"),
+    REGISTERED("reg");
+
+    private final String pass;
+
+    ChannelMode(String pass) {
+        this.pass = pass;
+    }
+
+    public String getPass() {
+        return pass;
+    }
+
+    public static Optional<ChannelMode> fromCode(String code) {
+        return Arrays.stream(values()).filter(it -> it.pass.equals(code)).findFirst();
+    }
+}

src/main/java/pl/polgrabiat/websockets/chat/websocketschat/dto/GlobalCtx.java

@@ -0,0 +1,56 @@
+package pl.polgrabiat.websockets.chat.websocketschat.dto;
+
+import org.springframework.web.socket.WebSocketSession;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+public class GlobalCtx {
+    private Set<WebSocketSession> sessions = new HashSet<>();
+    private Map<WebSocketSession, UserCtx> userSessions = new HashMap<>();
+    private String serverName = "localhost";
+    private Map<String, ChannelCtx> channels = new HashMap<>();
+    private Map<String, WebSocketSession> userNameSessions = new HashMap<>();
+
+    public Set<WebSocketSession> getSessions() {
+        return sessions;
+    }
+
+    public void setSessions(Set<WebSocketSession> sessions) {
+        this.sessions = sessions;
+    }
+
+    public Map<WebSocketSession, UserCtx> getUserSessions() {
+        return userSessions;
+    }
+
+    public void setUserSessions(Map<WebSocketSession, UserCtx> userSessions) {
+        this.userSessions = userSessions;
+    }
+
+    public String getServerName() {
+        return serverName;
+    }
+
+    public void setServerName(String serverName) {
+        this.serverName = serverName;
+    }
+
+    public Map<String, ChannelCtx> getChannels() {
+        return channels;
+    }
+
+    public void setChannels(Map<String, ChannelCtx> channels) {
+        this.channels = channels;
+    }
+
+    public Map<String, WebSocketSession> getUserNameSessions() {
+        return userNameSessions;
+    }
+
+    public void setUserNameSessions(Map<String, WebSocketSession> userNameSessions) {
+        this.userNameSessions = userNameSessions;
+    }
+}

src/main/java/pl/polgrabiat/websockets/chat/websocketschat/dto/UserCtx.java

@@ -0,0 +1,42 @@
+package pl.polgrabiat.websockets.chat.websocketschat.dto;
+
+import org.springframework.web.socket.WebSocketSession;
+
+public class UserCtx {
+    private final WebSocketSession session;
+    private String nick;
+    private String userName;
+    private String realName;
+
+    public UserCtx(WebSocketSession session) {
+        this.session = session;
+    }
+
+    public String getNick() {
+        return nick;
+    }
+
+    public void setNick(String nick) {
+        this.nick = nick;
+    }
+
+    public String getUserName() {
+        return userName;
+    }
+
+    public void setUserName(String userName) {
+        this.userName = userName;
+    }
+
+    public String getRealName() {
+        return realName;
+    }
+
+    public void setRealName(String realName) {
+        this.realName = realName;
+    }
+
+    public WebSocketSession getSession() {
+        return session;
+    }
+}

src/main/java/pl/polgrabiat/websockets/chat/websocketschat/handlers/ChatWebsocketHandler.java

@@ -0,0 +1,71 @@
+package pl.polgrabiat.websockets.chat.websocketschat.handlers;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Component;
+import org.springframework.web.socket.CloseStatus;
+import org.springframework.web.socket.TextMessage;
+import org.springframework.web.socket.WebSocketSession;
+import org.springframework.web.socket.handler.TextWebSocketHandler;
+import pl.polgrabiat.websockets.chat.websocketschat.dto.GlobalCtx;
+import pl.polgrabiat.websockets.chat.websocketschat.dto.UserCtx;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+@Component
+public class ChatWebsocketHandler extends TextWebSocketHandler {
+
+    private static final Logger lg = LoggerFactory.getLogger(ChatWebsocketHandler.class);
+
+    private Set<WebSocketSession> sessions = new HashSet<>();
+    private Map<String, SessionCommandHandler> commandHandlers = new HashMap<>();
+    private GlobalCtx globalCtx = new GlobalCtx();
+
+    public ChatWebsocketHandler() {
+        commandHandlers.put("USER", new UserCommandHandler());
+        commandHandlers.put("NICK", new NickCommandHandler());
+        commandHandlers.put("JOIN", new JoinCommandHandler());
+        commandHandlers.put("LEAVE", new LeaveCommandHandler());
+        commandHandlers.put("PRIVMSG", new PrivMessageHandler());
+    }
+
+    @Override
+    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
+        super.afterConnectionEstablished(session);
+        sessions.add(session);
+        globalCtx.getUserSessions().put(session, new UserCtx(session));
+    }
+
+    @Override
+    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
+        super.afterConnectionClosed(session, status);
+        sessions.remove(session);
+        globalCtx.getUserSessions().remove(session);
+    }
+
+    @Override
+    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
+        super.handleTextMessage(session, message);
+
+        lg.info("Message received: {}", message);
+        String payload = message.getPayload();
+        int commandEndIdx = payload.indexOf(" ");
+        if (commandEndIdx < 0) {
+            // no command
+            session.sendMessage(new TextMessage("Invalid command " + payload));
+            return;
+        }
+        String command = payload.substring(0, commandEndIdx);
+        String data = payload.substring(commandEndIdx+1);
+        SessionCommandHandler commandHandler = commandHandlers.get(command.toUpperCase());
+        if (commandHandler != null) {
+            commandHandler.handleCommand(globalCtx, session, payload, command, data);
+            return;
+        }
+
+        session.sendMessage(new TextMessage("Invalid command " + payload));
+    }
+}

src/main/java/pl/polgrabiat/websockets/chat/websocketschat/handlers/JoinCommandHandler.java

@@ -0,0 +1,13 @@
+package pl.polgrabiat.websockets.chat.websocketschat.handlers;
+
+import org.springframework.web.socket.WebSocketSession;
+import pl.polgrabiat.websockets.chat.websocketschat.dto.GlobalCtx;
+
+import java.io.IOException;
+
+public class JoinCommandHandler implements SessionCommandHandler {
+    @Override
+    public boolean handleCommand(GlobalCtx globalCtx, WebSocketSession session, String payload, String command, String data) throws IOException {
+        return false;
+    }
+}

src/main/java/pl/polgrabiat/websockets/chat/websocketschat/handlers/LeaveCommandHandler.java

@@ -0,0 +1,13 @@
+package pl.polgrabiat.websockets.chat.websocketschat.handlers;
+
+import org.springframework.web.socket.WebSocketSession;
+import pl.polgrabiat.websockets.chat.websocketschat.dto.GlobalCtx;
+
+import java.io.IOException;
+
+public class LeaveCommandHandler implements SessionCommandHandler {
+    @Override
+    public boolean handleCommand(GlobalCtx globalCtx, WebSocketSession session, String payload, String command, String data) throws IOException {
+        return false;
+    }
+}

src/main/java/pl/polgrabiat/websockets/chat/websocketschat/handlers/NickCommandHandler.java

@@ -0,0 +1,24 @@
+package pl.polgrabiat.websockets.chat.websocketschat.handlers;
+
+import org.springframework.web.socket.WebSocketSession;
+import pl.polgrabiat.websockets.chat.websocketschat.dto.GlobalCtx;
+
+import java.io.IOException;
+import java.util.StringTokenizer;
+
+public class NickCommandHandler implements SessionCommandHandler {
+    @Override
+    public boolean handleCommand(GlobalCtx globalCtx, WebSocketSession session, String payload, String command, String data) throws IOException {
+        StringTokenizer tokenizer = new StringTokenizer(data);
+        String nick = tokenizer.nextToken();
+
+        if (nick.equals(globalCtx.getUserSessions().get(session).getNick())) {
+          sendMessage(session,globalCtx,403, "MSG nick already used");
+          return true;
+        }
+
+        globalCtx.getUserSessions().get(session).setNick(nick);
+
+        return true;
+    }
+}

src/main/java/pl/polgrabiat/websockets/chat/websocketschat/handlers/PrivMessageHandler.java

@@ -0,0 +1,58 @@
+package pl.polgrabiat.websockets.chat.websocketschat.handlers;
+
+import org.apache.catalina.User;
+import org.springframework.web.socket.WebSocketSession;
+import pl.polgrabiat.websockets.chat.websocketschat.dto.ChannelCtx;
+import pl.polgrabiat.websockets.chat.websocketschat.dto.GlobalCtx;
+import pl.polgrabiat.websockets.chat.websocketschat.dto.UserCtx;
+
+import java.io.IOException;
+import java.util.StringTokenizer;
+
+public class PrivMessageHandler implements SessionCommandHandler {
+    @Override
+    public boolean handleCommand(GlobalCtx globalCtx, WebSocketSession session, String payload, String command, String data) throws IOException {
+        StringTokenizer tokenizer = new StringTokenizer(data);
+        String destination = tokenizer.nextToken();
+        if (destination.startsWith("#")) {
+            // channel
+
+            ChannelCtx channel = globalCtx.getChannels().get(destination);
+            if (channel == null) {
+                sendMessage(session,
+                        globalCtx, 404, "MSG invalid destination");
+                return true;
+            }
+
+            UserCtx userCtx = globalCtx.getUserSessions().get(session);
+
+            if (!channel.getUsers().contains(userCtx)) {
+                sendMessage(session, globalCtx, 403, "MSG You are not the member of this channel");
+                return true;
+            }
+
+            // sending to other users
+
+            for (UserCtx user : channel.getUsers()) {
+                sendMessage(user.getSession(), globalCtx, 200, payload);
+            }
+
+            return true;
+
+        } else {
+            // user
+
+            UserCtx userCtx = globalCtx.getUserSessions().get(destination);
+            if (userCtx == null) {
+                sendMessage(session,
+                        globalCtx, 404, "MSG invalid destination");
+                return true;
+            }
+
+            sendMessage(userCtx.getSession(),
+                    globalCtx, 200, payload);
+
+            return true;
+        }
+    }
+}

src/main/java/pl/polgrabiat/websockets/chat/websocketschat/handlers/SessionCommandHandler.java

@@ -0,0 +1,19 @@
+package pl.polgrabiat.websockets.chat.websocketschat.handlers;
+
+import org.springframework.web.socket.TextMessage;
+import org.springframework.web.socket.WebSocketSession;
+import pl.polgrabiat.websockets.chat.websocketschat.dto.GlobalCtx;
+
+import java.io.IOException;
+
+public interface SessionCommandHandler {
+    boolean handleCommand(GlobalCtx globalCtx, WebSocketSession session, String payload, String command, String data) throws IOException;
+
+    default void sendMessage(WebSocketSession session, GlobalCtx globalCtx, int responseCode, String data) throws IOException {
+        session.sendMessage(new TextMessage(String.format(":%s %d %s %s",
+                globalCtx.getServerName(),
+                responseCode,
+                globalCtx.getUserSessions().get(session).getNick(),
+                data)));
+    }
+}

src/main/java/pl/polgrabiat/websockets/chat/websocketschat/handlers/UserCommandHandler.java

@@ -0,0 +1,39 @@
+package pl.polgrabiat.websockets.chat.websocketschat.handlers;
+
+import org.springframework.web.socket.WebSocketSession;
+import pl.polgrabiat.websockets.chat.websocketschat.dto.GlobalCtx;
+import pl.polgrabiat.websockets.chat.websocketschat.dto.UserCtx;
+
+import java.io.IOException;
+import java.util.StringTokenizer;
+
+public class UserCommandHandler implements SessionCommandHandler {
+    @Override
+    public boolean handleCommand(GlobalCtx globalCtx, WebSocketSession session, String payload, String command, String data) throws IOException {
+        StringTokenizer tokenizer = new StringTokenizer(data," ");
+        String userName = tokenizer.nextToken();
+        String code1 = tokenizer.nextToken();
+        if (!"0".equals(code1)) {
+            return false;
+        }
+
+        String code2 = tokenizer.nextToken();
+        if (!"*".equals(code2)) {
+            return false;
+        }
+
+        String realName = tokenizer.nextToken(":");
+        UserCtx userCtx = globalCtx.getUserSessions().get(session.getId());
+
+        String nick = userCtx.getNick();
+        if (nick == null || "".equals(nick)) {
+
+        }
+        userCtx.setUserName(userName);
+        userCtx.setRealName(realName);
+
+        sendMessage(session, globalCtx, 200,
+                "MSG OK");
+        return true;
+    }
+}

src/main/resources/static/index.html

@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <title>SockJS example</title>
+        <meta charset="UTF-8" />
+        <script type="application/javascript" src="/webjars/sockjs-client/0.3.4/sockjs.js"></script>
+        <script type="application/javascript" src="index.js"></script>
+    </head>
+    <body>
+        <input id="message" type="text" />
+    </body>
+</html>

src/main/resources/static/index.js

@@ -0,0 +1,23 @@
+window.onload = function() {
+    var sockJs = new SockJS("/chat");
+    sockJs.onopen = function() {
+        console.log("Socket opened");
+        // TODO send a nick message
+        // TODO send the userName and realName message
+    };
+
+    sockJs.onclose = function() {
+        console.log("Socket closed");
+    };
+
+    sockJs.onmessage = function(e) {
+        console.log("Received message: " + e.data);
+    };
+
+    var messageInput = document.getElementById("message");
+    messageInput.onkeyup = function(e) {
+        if (e.keyCode == 13) {
+            sockJs.send(messageInput.value);
+        }
+    };
+};

src/test/java/pl/polgrabiat/websockets/chat/websocketschat/WebsocketsChatApplicationTests.java

@@ -0,0 +1,16 @@
+package pl.polgrabiat.websockets.chat.websocketschat;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class WebsocketsChatApplicationTests {
+
+	@Test
+	public void contextLoads() {
+	}
+
+}