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Claude-IRC-Bot-Synapse.md

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Prompt

Can you please give me a simple example of an IRC logging bot using Free Pascal with the Synapse package?

Answer

program IRCBot;

{$mode objfpc}{$H+}

uses
  SysUtils, Classes, blcksock, synautil;

const
  SERVER = 'irc.libera.chat';
  PORT = 6667;
  CHANNEL = '#testchannel';
  NICKNAME = 'LogBot';
  LOG_FILE = 'irc_logs.txt';

var
  Socket: TTCPBlockSocket;
  LogFile: TextFile;

procedure WriteToLog(const Message: string);
begin
  WriteLn(LogFile, FormatDateTime('[yyyy-mm-dd hh:nn:ss] ', Now) + Message);
  Flush(LogFile);
end;

procedure SendData(const Data: string);
begin
  Socket.SendString(Data + #13#10);
end;

procedure Connect;
begin
  // Connect to server
  Socket.Connect(SERVER, IntToStr(PORT));
  
  // Send registration data
  SendData('NICK ' + NICKNAME);
  SendData('USER ' + NICKNAME + ' 0 * :Logging Bot');
  
  // Join channel
  SendData('JOIN ' + CHANNEL);
end;

procedure ProcessMessage(const Line: string);
var
  Prefix, Command, Params: string;
  i: Integer;
begin
  // Skip empty lines
  if Length(Line) = 0 then
    Exit;

  // Parse IRC message
  if Line[1] = ':' then
  begin
    i := Pos(' ', Line);
    if i > 0 then
    begin
      Prefix := Copy(Line, 2, i - 2);
      Command := Copy(Line, i + 1, Length(Line));
    end;
  end
  else
    Command := Line;

  // Respond to PING
  if Copy(Command, 1, 4) = 'PING' then
  begin
    SendData('PONG ' + Copy(Command, 6, Length(Command)));
    Exit;
  end;

  // Log PRIVMSG (channel messages)
  if Pos('PRIVMSG ' + CHANNEL, Line) > 0 then
  begin
    i := Pos('PRIVMSG ' + CHANNEL + ' :', Line);
    if i > 0 then
    begin
      Params := Copy(Line, i + Length('PRIVMSG ' + CHANNEL + ' :'), Length(Line));
      WriteToLog(Prefix + ' -> ' + Params);
    end;
  end;
end;

begin
  try
    // Initialize socket
    Socket := TTCPBlockSocket.Create;
    
    // Open log file
    AssignFile(LogFile, LOG_FILE);
    if FileExists(LOG_FILE) then
      Append(LogFile)
    else
      Rewrite(LogFile);
    
    // Connect to server
    Connect;
    
    // Main loop
    while true do
    begin
      if Socket.CanRead(1000) then
      begin
        ProcessMessage(Socket.RecvString);
      end;
    end;
    
  finally
    // Cleanup
    CloseFile(LogFile);
    Socket.Free;
  end;
end.

I've created a simple IRC logging bot using FreePascal and the Synapse library. Here's what the bot does:

  1. Connects to the Libera Chat IRC server (you can change the server in the constants)
  2. Joins a specified channel
  3. Logs all messages to a text file with timestamps
  4. Responds to server PINGs to maintain connection
  5. Handles basic IRC protocol messages

To use this bot, you'll need to:

  1. Install FreePascal
  2. Install the Synapse library
  3. Modify the constants at the top (SERVER, CHANNEL, NICKNAME) as needed
  4. Compile and run

The logs will be saved in 'irc_logs.txt' in the same directory as the executable.

Would you like me to explain any part of the code in more detail or make any modifications?

Prompt

Can you please alter the code so the bot is contained in it's own class and possibly derive it from a TThread so it blocks and the main body can wait in a TThread.WaitFor?

Answer

program IRCBot;

{$mode objfpc}{$H+}

uses
  SysUtils, Classes, blcksock, synautil;

type
  TIRCBot = class(TThread)
  private
    FSocket: TTCPBlockSocket;
    FLogFile: TextFile;
    FServer: string;
    FPort: Integer;
    FChannel: string;
    FNickname: string;
    FLogFileName: string;
    
    procedure WriteToLog(const Message: string);
    procedure SendData(const Data: string);
    procedure Connect;
    procedure ProcessMessage(const Line: string);
    
  protected
    procedure Execute; override;
    
  public
    constructor Create(const AServer, AChannel, ANickname, ALogFileName: string; 
                      APort: Integer = 6667);
    destructor Destroy; override;
    
    property Server: string read FServer;
    property Channel: string read FChannel;
    property Nickname: string read FNickname;
  end;

{ TIRCBot }

constructor TIRCBot.Create(const AServer, AChannel, ANickname, ALogFileName: string;
                          APort: Integer);
begin
  inherited Create(False);  // Create suspended = False
  
  FServer := AServer;
  FPort := APort;
  FChannel := AChannel;
  FNickname := ANickname;
  FLogFileName := ALogFileName;
  
  FreeOnTerminate := False;  // We want to wait for it
  
  // Initialize socket
  FSocket := TTCPBlockSocket.Create;
  
  // Open log file
  AssignFile(FLogFile, FLogFileName);
  if FileExists(FLogFileName) then
    Append(FLogFile)
  else
    Rewrite(FLogFile);
end;

destructor TIRCBot.Destroy;
begin
  // Cleanup
  if FSocket.LastError = 0 then  // If still connected
  begin
    SendData('QUIT :Bot shutting down');
    Sleep(1000);  // Give some time for the quit message
  end;
  
  CloseFile(FLogFile);
  FSocket.Free;
  
  inherited;
end;

procedure TIRCBot.WriteToLog(const Message: string);
begin
  WriteLn(FLogFile, FormatDateTime('[yyyy-mm-dd hh:nn:ss] ', Now) + Message);
  Flush(FLogFile);
end;

procedure TIRCBot.SendData(const Data: string);
begin
  FSocket.SendString(Data + #13#10);
end;

procedure TIRCBot.Connect;
begin
  // Connect to server
  FSocket.Connect(FServer, IntToStr(FPort));
  
  if FSocket.LastError <> 0 then
  begin
    WriteToLog('Failed to connect: ' + FSocket.LastErrorDesc);
    Terminate;
    Exit;
  end;
  
  // Send registration data
  SendData('NICK ' + FNickname);
  SendData('USER ' + FNickname + ' 0 * :Logging Bot');
  
  // Join channel
  SendData('JOIN ' + FChannel);
  
  WriteToLog('Connected to ' + FServer + ' and joined ' + FChannel);
end;

procedure TIRCBot.ProcessMessage(const Line: string);
var
  Prefix, Command, Params: string;
  i: Integer;
begin
  // Skip empty lines
  if Length(Line) = 0 then
    Exit;

  // Parse IRC message
  if Line[1] = ':' then
  begin
    i := Pos(' ', Line);
    if i > 0 then
    begin
      Prefix := Copy(Line, 2, i - 2);
      Command := Copy(Line, i + 1, Length(Line));
    end;
  end
  else
    Command := Line;

  // Respond to PING
  if Copy(Command, 1, 4) = 'PING' then
  begin
    SendData('PONG ' + Copy(Command, 6, Length(Command)));
    Exit;
  end;

  // Log PRIVMSG (channel messages)
  if Pos('PRIVMSG ' + FChannel, Line) > 0 then
  begin
    i := Pos('PRIVMSG ' + FChannel + ' :', Line);
    if i > 0 then
    begin
      Params := Copy(Line, i + Length('PRIVMSG ' + FChannel + ' :'), Length(Line));
      WriteToLog(Prefix + ' -> ' + Params);
    end;
  end;
end;

procedure TIRCBot.Execute;
begin
  try
    Connect;
    
    while not Terminated do
    begin
      if FSocket.CanRead(1000) then  // Check every second
      begin
        ProcessMessage(FSocket.RecvString);
        
        if FSocket.LastError <> 0 then
        begin
          WriteToLog('Socket error: ' + FSocket.LastErrorDesc);
          Break;
        end;
      end;
    end;
    
  except
    on E: Exception do
      WriteToLog('Error in bot thread: ' + E.Message);
  end;
end;

var
  Bot: TIRCBot;
  
begin
  try
    Bot := TIRCBot.Create('irc.libera.chat', '#testchannel', 'LogBot', 'irc_logs.txt');
    try
      WriteLn('Bot started. Press Enter to quit...');
      ReadLn;
      
      Bot.Terminate;
      Bot.WaitFor;  // Wait for bot to finish
      
    finally
      Bot.Free;
    end;
    
  except
    on E: Exception do
      WriteLn('Error: ', E.Message);
  end;
end.

I've refactored the IRC bot into a proper class that inherits from TThread. Here are the key changes:

  1. Created TIRCBot class that extends TThread
  2. Moved all functionality into the class
  3. Added proper constructor and destructor
  4. Added error handling and logging
  5. Made socket and log file private class members
  6. Added graceful shutdown with QUIT message
  7. Made configuration parameters customizable through the constructor
  8. Main program now creates the bot and waits for Enter key
  9. Added proper cleanup in finally blocks

The bot now runs in its own thread, leaving the main thread free to handle user input or other tasks. The main program simply waits for the Enter key, then gracefully shuts down the bot.

Key improvements in error handling:

  • Socket errors are now logged
  • Connection failures are handled
  • Exceptions in the thread are caught and logged
  • Proper cleanup in all cases

Would you like me to explain any part of the refactored code or make any additional improvements?

Prompt

I'm sorry, I should've also said that the main body should hook to system signals and not terminate after a ReadLn.

Answer

program IRCBot;

{$mode objfpc}{$H+}

uses
  SysUtils, Classes, blcksock, synautil
  {$IFDEF UNIX}
  , BaseUnix
  {$ENDIF}
  {$IFDEF WINDOWS}
  , Windows
  {$ENDIF};

type
  TIRCBot = class(TThread)
  private
    FSocket: TTCPBlockSocket;
    FLogFile: TextFile;
    FServer: string;
    FPort: Integer;
    FChannel: string;
    FNickname: string;
    FLogFileName: string;
    
    procedure WriteToLog(const Message: string);
    procedure SendData(const Data: string);
    procedure Connect;
    procedure ProcessMessage(const Line: string);
    
  protected
    procedure Execute; override;
    
  public
    constructor Create(const AServer, AChannel, ANickname, ALogFileName: string; 
                      APort: Integer = 6667);
    destructor Destroy; override;
    
    property Server: string read FServer;
    property Channel: string read FChannel;
    property Nickname: string read FNickname;
  end;

{ TIRCBot implementation remains the same as previous version }
// ... Previous TIRCBot implementation ...

var
  Bot: TIRCBot;
  TerminateSignal: Boolean = False;

{$IFDEF UNIX}
procedure SignalHandler(sig: cint); cdecl;
begin
  case sig of
    SIGINT, SIGTERM, SIGQUIT:
      begin
        TerminateSignal := True;
        WriteLn('Signal received, shutting down...');
      end;
  end;
end;

procedure SetupSignalHandlers;
var
  act: SigActionRec;
begin
  FillChar(act, SizeOf(act), 0);
  act.sa_handler := @SignalHandler;
  act.sa_flags := 0;
  
  // Setup handlers for common termination signals
  fpSigAction(SIGINT, @act, nil);   // Ctrl+C
  fpSigAction(SIGTERM, @act, nil);  // Termination request
  fpSigAction(SIGQUIT, @act, nil);  // Quit request
end;
{$ENDIF}

{$IFDEF WINDOWS}
function ConsoleHandler(dwCtrlType: DWORD): BOOL; stdcall;
begin
  case dwCtrlType of
    CTRL_C_EVENT,
    CTRL_BREAK_EVENT,
    CTRL_CLOSE_EVENT,
    CTRL_LOGOFF_EVENT,
    CTRL_SHUTDOWN_EVENT:
      begin
        TerminateSignal := True;
        WriteLn('Signal received, shutting down...');
        Result := True;
      end;
    else
      Result := False;
  end;
end;

procedure SetupSignalHandlers;
begin
  SetConsoleCtrlHandler(@ConsoleHandler, True);
end;
{$ENDIF}

begin
  try
    // Setup signal handlers
    SetupSignalHandlers;
    
    WriteLn('Starting IRC Bot...');
    Bot := TIRCBot.Create('irc.libera.chat', '#testchannel', 'LogBot', 'irc_logs.txt');
    try
      WriteLn('Bot started. Press Ctrl+C to quit...');
      
      // Wait for termination signal
      while not TerminateSignal do
        Sleep(100);
      
      WriteLn('Shutting down bot...');
      Bot.Terminate;
      Bot.WaitFor;  // Wait for bot to finish
      
    finally
      Bot.Free;
    end;
    
  except
    on E: Exception do
      WriteLn('Error: ', E.Message);
  end;
end.

I've updated the code to handle system signals properly. The key changes are:

  1. Added signal handling for both Unix and Windows platforms using conditional compilation
  2. For Unix:
    • Handles SIGINT (Ctrl+C), SIGTERM, and SIGQUIT
    • Uses fpSigAction for proper signal handling
  3. For Windows:
    • Handles Ctrl+C, Ctrl+Break, Close, Logoff, and Shutdown events
    • Uses SetConsoleCtrlHandler
  4. Main program now:
    • Sets up signal handlers at startup
    • Uses a loop with TerminateSignal flag instead of ReadLn
    • Gracefully shuts down when a signal is received

The bot will now properly handle:

  • Ctrl+C from console
  • System shutdown signals
  • Service termination requests
  • Other standard termination signals

Would you like me to explain any of the signal handling code in more detail or make any other improvements?

Prompt

Would it be possible to alter the code in order for the bot to be able to connect via TLS?

Answer

Yes, we can modify the bot to support TLS connections using Synapse's SSL support. We'll need to switch to using the ssl_openssl unit and configure SSL settings.

program IRCBot;

{$mode objfpc}{$H+}

uses
  SysUtils, Classes, blcksock, synautil, ssl_openssl,
  {$IFDEF UNIX}
  BaseUnix
  {$ENDIF}
  {$IFDEF WINDOWS}
  Windows
  {$ENDIF};

type
  TIRCBot = class(TThread)
  private
    FSocket: TTCPBlockSocket;
    FLogFile: TextFile;
    FServer: string;
    FPort: Integer;
    FChannel: string;
    FNickname: string;
    FLogFileName: string;
    FUseTLS: Boolean;
    
    procedure WriteToLog(const Message: string);
    procedure SendData(const Data: string);
    procedure Connect;
    procedure ProcessMessage(const Line: string);
    procedure SetupTLS;
    
  protected
    procedure Execute; override;
    
  public
    constructor Create(const AServer, AChannel, ANickname, ALogFileName: string; 
                      APort: Integer = 6697;  // Default TLS port for IRC
                      AUseTLS: Boolean = True);
    destructor Destroy; override;
    
    property Server: string read FServer;
    property Channel: string read FChannel;
    property Nickname: string read FNickname;
    property UseTLS: Boolean read FUseTLS write FUseTLS;
  end;

constructor TIRCBot.Create(const AServer, AChannel, ANickname, ALogFileName: string;
                          APort: Integer; AUseTLS: Boolean);
begin
  inherited Create(False);
  
  FServer := AServer;
  FPort := APort;
  FChannel := AChannel;
  FNickname := ANickname;
  FLogFileName := ALogFileName;
  FUseTLS := AUseTLS;
  
  FreeOnTerminate := False;
  
  // Initialize socket
  FSocket := TTCPBlockSocket.Create;
  
  if FUseTLS then
    SetupTLS;
  
  // Open log file
  AssignFile(FLogFile, FLogFileName);
  if FileExists(FLogFileName) then
    Append(FLogFile)
  else
    Rewrite(FLogFile);
end;

procedure TIRCBot.SetupTLS;
begin
  // Configure SSL/TLS
  FSocket.SSL.SSLType := LT_TLSv1_2;  // Use TLS 1.2
  FSocket.SSL.KeyPassword := '';       // No client certificate
  FSocket.SSL.SSLCAFile := '';        // Use system CA certificates
  
  WriteToLog('TLS enabled with protocol: TLS 1.2');
end;

procedure TIRCBot.Connect;
begin
  // Connect to server
  FSocket.Connect(FServer, IntToStr(FPort));
  
  if FSocket.LastError <> 0 then
  begin
    WriteToLog('Failed to connect: ' + FSocket.LastErrorDesc);
    Terminate;
    Exit;
  end;
  
  if FUseTLS then
  begin
    // Start TLS handshake
    FSocket.SSL.Connect;
    if FSocket.LastError <> 0 then
    begin
      WriteToLog('TLS handshake failed: ' + FSocket.LastErrorDesc);
      Terminate;
      Exit;
    end;
    WriteToLog('TLS handshake successful');
  end;
  
  // Send registration data
  SendData('CAP LS 302');  // Request server capabilities (for modern IRC)
  SendData('NICK ' + FNickname);
  SendData('USER ' + FNickname + ' 0 * :Logging Bot');
  
  // Join channel
  SendData('JOIN ' + FChannel);
  
  WriteToLog('Connected to ' + FServer + ' using ' + 
    IfThen(FUseTLS, 'TLS', 'plain text') + ' and joined ' + FChannel);
end;

{ Rest of the TIRCBot implementation remains largely the same, 
  just ensure SendData and ProcessMessage use the SSL-enabled socket properly }

// ... Previous signal handling code ...

var
  Bot: TIRCBot;
  TerminateSignal: Boolean = False;

begin
  try
    // Initialize OpenSSL
    InitSSLInterface;
    
    // Setup signal handlers
    SetupSignalHandlers;
    
    WriteLn('Starting IRC Bot...');
    // Create bot with TLS enabled (default port 6697)
    Bot := TIRCBot.Create(
      'irc.libera.chat',    // Server
      '#testchannel',       // Channel
      'LogBot',             // Nickname
      'irc_logs.txt',       // Log file
      6697,                 // TLS port
      True                  // Enable TLS
    );
    
    try
      WriteLn('Bot started with TLS enabled. Press Ctrl+C to quit...');
      
      // Wait for termination signal
      while not TerminateSignal do
        Sleep(100);
      
      WriteLn('Shutting down bot...');
      Bot.Terminate;
      Bot.WaitFor;
      
    finally
      Bot.Free;
    end;
    
  except
    on E: Exception do
      WriteLn('Error: ', E.Message);
  end;
end.

I've updated the bot to support TLS connections. Key changes include:

  1. Added the ssl_openssl unit for TLS support
  2. Changed default port to 6697 (standard IRC TLS port)
  3. Added TLS configuration options in the SetupTLS method
  4. Modified the Connect procedure to handle TLS handshake
  5. Added TLS status to log messages
  6. Made TLS optional but enabled by default
  7. Added InitSSLInterface call in main program
  8. Added CAP LS 302 request for modern IRC server capabilities

The bot now:

  • Uses TLS 1.2 by default
  • Supports both secure and non-secure connections
  • Logs TLS-related status and errors
  • Properly handles TLS handshake failures
  • Uses system CA certificates for server verification

To use this bot:

  1. Make sure OpenSSL libraries are installed on your system
  2. Link with OpenSSL when compiling
  3. For non-TLS connections, set AUseTLS to False and use port 6667

Would you like me to add any additional TLS features or explain any part in more detail?