Mirc-style multi user chat server-client system.

Features

• connections through sockets
• each client has its own thread
• role-based structure:
  • controlled access in groups (join for public, request/add/invite/accept invitations for public/private/closed types)
  • different commands available for each client (GUEST/USER/ADMIN/SUPERADMIN)
• group chat broadcast / client-to-client talk (with block/unblock options)

Classes involved:

• GroupHandler - handles group communication
  • each group has an owner - a ClientHandler instance
  • the "Main" group has the ServerBot special ClientHandler instance
• ClientHandler - handles client
  • transfers each line to a CommandProcessor class for execution
  • updates its own properties(groups, blockedClients)
  • requires the server to update its lists of all clients/all groups
  • transfers groups operation to the GroupHandler class
• CommandProcessor: execute a current command line from client
• Server - Handles the clients connections
  • manages its central lists (groups/clients)
• ServerMain - launches the server app

Commands:

!Any line that doesn't begin with "/" is considered a text to be broadcast to the current group

Guest commands:

• /help
• /quit
• /login <user_name>
• /list - list all available chat groups
• /speak - deliver message to the current group
• /info - display user & group info

Normal user commands:

• /logoff # = /quit
• /user <new_username>
• /create [] # where type can be [public]|private|closed
• /select # set another group as the current group (if already member)
• /request # request to be added to a PRIVATE group
• /join # join a PUBLIC group
• /leave
• /accept - accept an invite sent by an admin from a CLOSED group
• /talk <user_name> - deliver to client <user_name>
• /block <user_name> - block client <user_name>
• /unblock <user_name> - unblock client <user_name>

Admin commands:

• /groupname <new_name> # change the name of the current group
• /grouptype <new_type> # where new_type can be [public]|private|closed
• /add [] - add an user to a group
• /kick [] [] - remove an user from a group
• /promote [] - make an user admin on that group
• /demote [] - transforms the role of an admin to normal user on that group
• /invite [] - invite an user to a PRIVATE group

SuperAdmin commands:

• /delete

Server bot jobs:

• When a user logs in, broadcast a message to all users [not affiliated to a group]
• When a user logs off, broadcast a message to all users [not affiliated to a group]
• handle main-hall group
• handle groups' bots
• list all groups

Group bot jobs:

• When a user joins a room, broadcast a message to all users in that group
• When a user leaves a room, broadcast a message to all users in that group
• list all users from the group (ordered by role importance, then alphabetically)

Groups can be:

• public (anyone can join)
• private (one can send a request, but it has to be invited by an admin)
• closed (one can join only after being invited by an admin)

A normal user can:

• create a group - and then it receives super-admin role in that group
• join a public group (or save an interest about private/closed groups)
• leave a group (by his own or by being kicked)
• send invite requests to private groups (to the groups' admins)
• accept invites from admins in closed groups

In a group, an admin can:

• invite users to the group (specific message for join group)
• kick users from the group (reason for kicking [because!])
• promote/demote users to/from admin role

In a group, a super-admin can:

• not be kicked (being super-admin!)
• invite users to the group (specific message for join group)
• kick users from the group (reason for kicking [because!])
• promote/demote users to/from admin role

Client interface:

• if not logged-in, login button with random username prepared
• main group tab active, even for not logged-in clients
• sidebar with available groups and "create new group" section with input field & button

Run commands examples:

server:

REM "C:\Program Files\Java\jdk-9.0.4\bin\java.exe" -javaagent:C:\Users\teodor.muraru\AppData\Local\JetBrains\Toolbox\apps\IDEA-C\ch-0\181.5087.20\lib\idea_rt.jar=52581:C:\Users\teodor.muraru\AppData\Local\JetBrains\Toolbox\apps\IDEA-C\ch-0\181.5087.20\bin -Dfile.encoding=UTF-8 -classpath D:\work\IdeaProjects\retele\proiect\ChatApp\out\production\ServerApp;D:\work\IdeaProjects\retele\proiect\ChatApp\ServerApp\lib\commons-lang3-3.7.jar com.temuraru.ServerMain java.exe -javaagent:"C:\Users\teodor.muraru\AppData\Local\JetBrains\Toolbox\apps\IDEA-C\ch-0\181.5087.20\lib\idea_rt.jar"=52581:"C:\Users\teodor.muraru\AppData\Local\JetBrains\Toolbox\apps\IDEA-C\ch-0\181.5087.20\bin" -Dfile.encoding=UTF-8 -classpath "D:\work\IdeaProjects\retele\proiect\ChatApp\out\production\ServerApp;D:\work\IdeaProjects\retele\proiect\ChatApp\ServerApp\lib\commons-lang3-3.7.jar" com.temuraru.ServerMain Server started on port: 8867!

client/console:

telnet localhost 8867

TODO:

Each tab has a conversation field and am input field + Send button at the bottom The input field can send messages to the group/another client or commands (statements starting with / or ) to the server Tab name = group name or username