pbot/PBot/NickList.pm

# File: NickList.pm
# Author: pragma_
#
# Purpose: Maintains lists of nicks currently present in channels.
# Used to retrieve list of channels a nick is present in or to
# determine if a nick is present in a channel.

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

package PBot::NickList;

use warnings;
use strict;

use feature 'unicode_strings';

use Text::Levenshtein qw/fastdistance/;
use Data::Dumper;
$Data::Dumper::Sortkeys = 1;
use Carp ();
use Time::HiRes qw/gettimeofday/;

sub new {
  Carp::croak("Options to " . __FILE__ . " should be key/value pairs, not hash reference") if ref $_[1] eq 'HASH';
  my ($class, %conf) = @_;
  my $self = bless {}, $class;
  $self->initialize(%conf);
  return $self;
}

sub initialize {
  my ($self, %conf) = @_;

  $self->{pbot}    = delete $conf{pbot} // Carp::croak("Missing pbot reference to " . __FILE__);
  $self->{nicklist} = {};

  $self->{pbot}->{registry}->add_default('text', 'nicklist', 'debug', '0');

  $self->{pbot}->{commands}->register(sub { $self->show_nicklist(@_) }, "nicklist", 0);

  $self->{pbot}->{event_dispatcher}->register_handler('irc.namreply',  sub { $self->on_namreply(@_) });
  $self->{pbot}->{event_dispatcher}->register_handler('irc.join',      sub { $self->on_join(@_) });
  $self->{pbot}->{event_dispatcher}->register_handler('irc.part',      sub { $self->on_part(@_) });
  $self->{pbot}->{event_dispatcher}->register_handler('irc.quit',      sub { $self->on_quit(@_) });
  $self->{pbot}->{event_dispatcher}->register_handler('irc.kick',      sub { $self->on_kick(@_) });
  $self->{pbot}->{event_dispatcher}->register_handler('irc.nick',      sub { $self->on_nickchange(@_) });
  $self->{pbot}->{event_dispatcher}->register_handler('irc.public',    sub { $self->on_activity(@_) });
  $self->{pbot}->{event_dispatcher}->register_handler('irc.caction',   sub { $self->on_activity(@_) });

  # handlers for the bot itself joining/leaving channels
  $self->{pbot}->{event_dispatcher}->register_handler('pbot.join',    sub { $self->on_join_channel(@_) });
  $self->{pbot}->{event_dispatcher}->register_handler('pbot.part',    sub { $self->on_part_channel(@_) });
}

sub show_nicklist {
  my ($self, $from, $nick, $user, $host, $arguments) = @_;
  my $nicklist;

  if (not length $arguments) {
    return "Usage: nicklist <channel> [nick]";
  }

  my @args = split / /, $arguments;

  if (@args == 1) {
    if (not exists $self->{nicklist}->{lc $arguments}) {
      return "No nicklist for $arguments.";
    }
    $nicklist = Dumper($self->{nicklist}->{lc $arguments});
  } else {
    if (not exists $self->{nicklist}->{lc $args[0]}) {
      return "No nicklist for $args[0].";
    } elsif (not exists $self->{nicklist}->{lc $args[0]}->{lc $args[1]}) {
      return "No such nick $args[1] in channel $args[0].";
    }
    $nicklist = Dumper($self->{nicklist}->{lc $args[0]}->{lc $args[1]});
  }

  return $nicklist;
}

sub update_timestamp {
  my ($self, $channel, $nick) = @_;
  my $orig_nick = $nick;
  $channel = lc $channel;
  $nick = lc $nick;

  if (exists $self->{nicklist}->{$channel} and exists $self->{nicklist}->{$channel}->{$nick}) {
    $self->{nicklist}->{$channel}->{$nick}->{timestamp} = gettimeofday;
  } else {
    $self->{pbot}->{logger}->log("Adding nick '$orig_nick' to channel '$channel'\n") if $self->{pbot}->{registry}->get_value('nicklist', 'debug');
    $self->{nicklist}->{$channel}->{$nick} = { nick => $orig_nick, timestamp => scalar gettimeofday };
  }
}

sub remove_channel {
  my ($self, $channel) = @_;
  delete $self->{nicklist}->{lc $channel};
}

sub add_nick {
  my ($self, $channel, $nick) = @_;
  if (not exists $self->{nicklist}->{lc $channel}->{lc $nick}) {
    $self->{pbot}->{logger}->log("Adding nick '$nick' to channel '$channel'\n") if $self->{pbot}->{registry}->get_value('nicklist', 'debug');
    $self->{nicklist}->{lc $channel}->{lc $nick} = { nick => $nick, timestamp => 0 };
  }
}

sub remove_nick {
  my ($self, $channel, $nick) = @_;
  $self->{pbot}->{logger}->log("Removing nick '$nick' from channel '$channel'\n") if $self->{pbot}->{registry}->get_value('nicklist', 'debug');
  delete $self->{nicklist}->{lc $channel}->{lc $nick};
}

sub get_channels {
  my ($self, $nick) = @_;
  my @channels;

  $nick = lc $nick;

  foreach my $channel (keys %{ $self->{nicklist} }) {
    if (exists $self->{nicklist}->{$channel}->{$nick}) {
      push @channels, $channel;
    }
  }

  return \@channels;
}

sub set_meta {
  my ($self, $channel, $nick, $key, $value) = @_;

  $channel = lc $channel;
  $nick = lc $nick;

  if (not exists $self->{nicklist}->{$channel} or not exists $self->{nicklist}->{$channel}->{$nick}) {
    if (exists $self->{nicklist}->{$channel} and $nick =~ m/[*?]/) {
      my $regex = quotemeta $nick;
      $regex =~ s/\\\*/.*?/g;
      $regex =~ s/\\\?/./g;

      my $found = 0;
      foreach my $n (keys %{$self->{nicklist}->{$channel}}) {
        if ($self->{nicklist}->{$channel}->{$n}->{hostmask} =~ m/$regex/i) {
          $self->{nicklist}->{$channel}->{$n}->{$key} = $value;
          $found++;
        }
      }
      return $found;
    } else {
      $self->{pbot}->{logger}->log("Nicklist: Attempt to set invalid meta ($key => $value) for $nick in $channel.\n");
      return 0;
    }
  }

  $self->{nicklist}->{$channel}->{$nick}->{$key} = $value;
  return 1;
}

sub delete_meta {
  my ($self, $channel, $nick, $key) = @_;

  $channel = lc $channel;
  $nick = lc $nick;

  if (not exists $self->{nicklist}->{$channel}
      or not exists $self->{nicklist}->{$channel}->{$nick}
      or not exists $self->{nicklist}->{$channel}->{$nick}->{$key}) {
    return undef;
  }

  return delete $self->{nicklist}->{$channel}->{$nick}->{$key};
}

sub get_meta {
  my ($self, $channel, $nick, $key) = @_;

  $channel = lc $channel;
  $nick = lc $nick;

  if (not exists $self->{nicklist}->{$channel}
      or not exists $self->{nicklist}->{$channel}->{$nick}
      or not exists $self->{nicklist}->{$channel}->{$nick}->{$key}) {
    return undef;
  }

  return $self->{nicklist}->{$channel}->{$nick}->{$key};
}

sub is_present_any_channel {
  my ($self, $nick) = @_;

  $nick = lc $nick;

  foreach my $channel (keys %{ $self->{nicklist} }) {
    if (exists $self->{nicklist}->{$channel}->{$nick}) {
      return $self->{nicklist}->{$channel}->{$nick}->{nick};
    }
  }
  return 0;
}

sub is_present {
  my ($self, $channel, $nick) = @_;

  $channel = lc $channel;
  $nick = lc $nick;

  if (exists $self->{nicklist}->{$channel} and exists $self->{nicklist}->{$channel}->{$nick}) {
    return $self->{nicklist}->{$channel}->{$nick}->{nick};
  } else {
    return 0;
  }
}

sub is_present_similar {
  my ($self, $channel, $nick, $similar) = @_;

  $channel = lc $channel;
  $nick = lc $nick;

  return 0 if not exists $self->{nicklist}->{$channel};
  return $self->{nicklist}->{$channel}->{$nick}->{nick} if $self->is_present($channel, $nick);
  return 0 if $nick =~ m/(?:^\$|\s)/;  # not nick-like

  my $percentage = $self->{pbot}->{registry}->get_value('interpreter', 'nick_similarity');
  $percentage = 0.20 if not defined $percentage;

  $percentage = $similar if defined $similar;

  my $now = gettimeofday;
  foreach my $person (sort { $self->{nicklist}->{$channel}->{$b}->{timestamp} <=> $self->{nicklist}->{$channel}->{$a}->{timestamp} } keys %{ $self->{nicklist}->{$channel} }) {
    return 0 if $now - $self->{nicklist}->{$channel}->{$person}->{timestamp} > 3600; # 1 hour
    my $distance = fastdistance($nick, $person);
    my $length = length $nick > length $person ? length $nick : length $person;

    if ($length != 0 && $distance / $length <= $percentage) {
      return $self->{nicklist}->{$channel}->{$person}->{nick};
    }
  }

  return 0;
}

sub random_nick {
  my ($self, $channel) = @_;

  $channel = lc $channel;

  if (exists $self->{nicklist}->{$channel}) {
    my $now = gettimeofday;
    my @nicks = grep { $now - $self->{nicklist}->{$channel}->{$_}->{timestamp} < 3600 * 2 } keys %{ $self->{nicklist}->{$channel} };

    my $nick = $nicks[rand @nicks];
    return $self->{nicklist}->{$channel}->{$nick}->{nick};
  } else {
    return undef;
  }
}

sub on_namreply {
  my ($self, $event_type, $event) = @_;
  my ($channel, $nicks) = ($event->{event}->{args}[2], $event->{event}->{args}[3]);

  foreach my $nick (split ' ', $nicks) {
    my $stripped_nick = $nick;
    $stripped_nick =~ s/^[@+%]//g; # remove OP/Voice/etc indicator from nick
    $self->add_nick($channel, $stripped_nick);

    my ($account_id, $hostmask) = $self->{pbot}->{messagehistory}->{database}->find_message_account_by_nick($stripped_nick);

    if (defined $hostmask) {
      my ($user, $host) = $hostmask =~ m/[^!]+!([^@]+)@(.*)/;
      $self->set_meta($channel, $stripped_nick, 'hostmask', $hostmask);
      $self->set_meta($channel, $stripped_nick, 'user', $user);
      $self->set_meta($channel, $stripped_nick, 'host', $host);
    }

    if ($nick =~ m/\@/) {
      $self->set_meta($channel, $stripped_nick, '+o', 1);
    }

    if ($nick =~ m/\+/) {
      $self->set_meta($channel, $stripped_nick, '+v', 1);
    }

    if ($nick =~ m/\%/) {
      $self->set_meta($channel, $stripped_nick, '+h', 1);
    }
  }

  return 0;
}

sub on_activity {
  my ($self, $event_type, $event) = @_;
  my ($nick, $user, $host, $channel) = ($event->{event}->nick, $event->{event}->user, $event->{event}->host, $event->{event}->{to}[0]);
  $self->update_timestamp($channel, $nick);
  return 0;
}

sub on_join {
  my ($self, $event_type, $event) = @_;
  my ($nick, $user, $host, $channel) = ($event->{event}->nick, $event->{event}->user, $event->{event}->host, $event->{event}->to);
  $self->add_nick($channel, $nick);
  $self->set_meta($channel, $nick, 'hostmask', "$nick!$user\@$host");
  $self->set_meta($channel, $nick, 'user', $user);
  $self->set_meta($channel, $nick, 'host', $host);
  return 0;
}

sub on_part {
  my ($self, $event_type, $event) = @_;
  my ($nick, $user, $host, $channel) = ($event->{event}->nick, $event->{event}->user, $event->{event}->host, $event->{event}->to);
  $self->remove_nick($channel, $nick);
  return 0;
}

sub on_quit {
  my ($self, $event_type, $event) = @_;
  my ($nick, $user, $host) = ($event->{event}->nick, $event->{event}->user, $event->{event}->host);

  foreach my $channel (keys %{ $self->{nicklist} }) {
    if ($self->is_present($channel, $nick)) {
      $self->remove_nick($channel, $nick);
    }
  }

  return 0;
}

sub on_kick {
  my ($self, $event_type, $event) = @_;
  my ($nick, $channel) = ($event->{event}->to, $event->{event}->{args}[0]);
  $self->remove_nick($channel, $nick);
  return 0;
}

sub on_nickchange {
  my ($self, $event_type, $event) = @_;
  my ($nick, $user, $host, $newnick) = ($event->{event}->nick, $event->{event}->user, $event->{event}->host, $event->{event}->args);

  foreach my $channel (keys %{ $self->{nicklist} }) {
    if ($self->is_present($channel, $nick)) {
      my $meta = delete $self->{nicklist}->{$channel}->{lc $nick};
      $meta->{nick} = $newnick;
      $meta->{timestamp} = gettimeofday;
      $self->{nicklist}->{$channel}->{lc $newnick} = $meta;
    }
  }

  return 0;
}

sub on_join_channel {
  my ($self, $event_type, $event) = @_;
  $self->remove_channel($event->{channel}); # clear nicklist to remove any stale nicks before repopulating with namreplies
  return 0;
}

sub on_part_channel {
  my ($self, $event_type, $event) = @_;
  $self->remove_channel($event->{channel});
  return 0;
}

1;