/
bot.rb
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/
bot.rb
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#--
# Copyright (c) 2007 Brett Stimmerman <brettstimmerman@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# * Neither the name of this project nor the names of its contributors may be
# used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#++
require 'rubygems'
require 'xmpp4r-simple'
module Jabber
# = Jabber::Bot
#
# Jabber::Bot makes it simple to create and command a Jabber bot with little
# fuss. By adding custom commands powered by regular expressions to your bot's
# repertoire, you and your new bot will be able to accomplish nearly anything.
#
# Author:: Brett Stimmerman (mailto:brettstimmerman@gmail.com)
# Version:: 1.1.0
# Copyright:: Copyright (c) 2007 Brett Stimmerman. All rights reserved.
# License:: New BSD License (http://opensource.org/licenses/bsd-license.php)
# Website:: http://socket7.net/software/jabber-bot
#
class Bot
# Direct access to the underlying
# Jabber::Simple[http://xmpp4r-simple.rubyforge.org/] object.
attr_reader :jabber
# Creates a new Jabber::Bot object with the specified +config+ Hash, which
# must contain +jabber_id+, +password+, and +master+ at a minimum.
#
# You may optionally give your bot a custom +name+. If +name+ is omitted,
# the username portion of +jabber_id+ is used instead.
#
# You may choose to restrict a Jabber::Bot to listen only to its master(s),
# or make it +public+.
#
# You may optionally specify a Jabber +presence+, +status+, and +priority+.
# If omitted, they each default to +nil+.
#
# By default, a Jabber::Bot has only a single command, 'help [<command>]',
# which displays a help message for the specified command, or all commands
# if <command> is omitted.
#
# If you choose to make a public bot, only the commands you specify as
# public, as well as the default 'help' command, will be public.
#
# # A minimally confiugured private bot with a single master.
# bot = Jabber::Bot.new(
# :jabber_id => 'bot@example.com',
# :password => 'password',
# :master => 'master@example.com'
# )
#
# # A highly configured public bot with a custom name, mutliple masters,
# # Jabber presence, status, and priority.
# masters = ['master1@example.com', 'master2@example.com']
#
# bot = Jabber::Bot.new(
# :name => 'PublicBot',
# :jabber_id => 'bot@example.com',
# :password => 'password',
# :master => masters,
# :is_public => true,
# :presence => :chat,
# :priority => 5,
# :status => 'Hello, I am PublicBot.'
# )
#
def initialize(config)
@config = config
@config[:is_public] ||= false
if @config[:name].nil? or @config[:name].length == 0
@config[:name] = @config[:jabber_id].sub(/@.+$/, '')
end
unless @config[:master].is_a?(Array)
@config[:master] = [@config[:master]]
end
@commands = { :spec => [], :meta => {} }
add_command(
:syntax => 'help [<command>]',
:description => 'Display help for the given command, or all commands' +
' if no command is specified',
:regex => /^help(\s+?.+?)?$/,
:alias => [ :syntax => '? [<command>]', :regex => /^\?(\s+?.+?)?$/ ],
:is_public => @config[:is_public]
) { |sender, message| help_message(sender, message) }
end
# Add a command to the bot's repertoire.
#
# Commands consist of a metadata Hash and a callback block. The metadata
# Hash *must* contain the command +syntax+, a +description+ for display with
# the builtin 'help' command, and a regular expression (+regex+) to detect
# the presence of the command in an incoming message.
#
# The metadata Hash may optionally contain an array of command aliases. An
# +alias+ consists of an alias +syntax+ and +regex+. Aliases allow the bot
# to understand command shorthands. For example, the default 'help' command
# has an alias '?'. Saying either 'help' or '?' will trigger the same
# command callback block.
#
# The metadata Hash may optionally contain a +is_public+ flag, indicating
# the bot should respond to *anyone* issuing the command, not just the bot
# master(s). Public commands are only truly public if the bot itself has
# been made public.
#
# The specified callback block will be triggered when the bot receives a
# message that matches the given command regex (or an alias regex). The
# callback block will have access to the sender and the message text (not
# including the command itsef), and should either return a String response
# or +nil+. If a callback block returns a String response, the response will
# be delivered to the Jabber id that issued the command.
#
# Examples:
#
# # Say 'puts foo' or 'p foo' and 'foo' will be written to $stdout.
# # The bot will also respond with "'foo' written to $stdout."
# add_command(
# :syntax => 'puts <string>',
# :description => 'Write something to $stdout',
# :regex => /^puts\s+.+$/,
# :alias => [ :syntax => 'p <string>', :regex => /^p\s+.+$/ ]
# ) do |sender, message|
# puts "#{sender} says #{message}."
# "'#{message}' written to $stdout."
# end
#
# # 'puts!' is a non-responding version of 'puts', and has two aliases,
# # 'p!' and '!'
# add_command(
# :syntax => 'puts! <string>',
# :description => 'Write something to $stdout (without response)',
# :regex => /^puts!\s+.+$/,
# :alias => [
# { :syntax => 'p! <string>', :regex => /^p!\s+.+$/ },
# { :syntax => '! <string>', :regex => /^!\s+/.+$/ }
# ]
# ) do |sender, message|
# puts "#{sender} says #{message}."
# nil
# end
#
# # 'rand' is a public command that produces a random number from 0 to 10
# add_command(
# :syntax => 'rand',
# :description => 'Produce a random number from 0 to 10',
# :regex => /^rand$/,
# :is_public => true
# ) { rand(10).to_s }
#
def add_command(command, &callback)
name = command_name(command[:syntax])
# Add the command meta - used in the 'help' command response.
add_command_meta(name, command)
# Add the command spec - used for parsing incoming commands.
add_command_spec(command, callback)
# Add any command aliases to the command meta and spec
unless command[:alias].nil?
command[:alias].each { |a| add_command_alias(name, a, callback) }
end
end
# Connect the bot, making it available to accept commands.
def connect
@jabber = Jabber::Simple.new(@config[:jabber_id], @config[:password])
presence(@config[:presence], @config[:status], @config[:priority])
deliver(@config[:master], "#{@config[:name]} reporting for duty.")
start_listener_thread
end
# Deliver a message to the specified recipient(s). Accepts a single
# recipient or an Array of recipients.
def deliver(to, message)
if to.is_a?(Array)
to.each { |t| @jabber.deliver(t, message) }
else
@jabber.deliver(to, message)
end
end
# Disconnect the bot. Once the bot has been disconnected, there is no way
# to restart it by issuing a command.
def disconnect
if @jabber.connected?
deliver(@config[:master], "#{@config[:name]} disconnecting...")
@jabber.disconnect
end
end
# Returns +true+ if the given Jabber id is a master, +false+ otherwise.
def master?(jabber_id)
@config[:master].include? jabber_id
end
# Sets the bot presence, status message and priority.
def presence(presence=nil, status=nil, priority=nil)
@config[:presence] = presence
@config[:status] = status
@config[:priority] = priority
status_message = Presence.new(presence, status, priority)
@jabber.send!(status_message) if @jabber.connected?
end
# Sets the bot presence. If you need to set more than just the presence,
# use presence() instead.
#
# Available values for presence are:
#
# * nil : online
# * :chat : free for chat
# * :away : away from the computer
# * :dnd : do not disturb
# * :xa : extended away
#
def presence=(presence)
presence(presence, @config[:status], @config[:priority])
end
# Set the bot priority. Priority is an integer from -127 to 127. If you need
# to set more than just the priority, use presence() instead.
def priority=(priority)
presence(@config[:presence], @config[:status], priority)
end
# Set the status message. A status message is just a String, e.g. 'I am
# here.' or 'Out to lunch.' If you need to set more than just the status
# message, use presence() instead.
def status=(status)
presence(@config[:presence], status, @config[:priority])
end
private
# Add a command alias for the given original +command_name+
def add_command_alias(command_name, alias_command, callback) #:nodoc:
original_command = @commands[:meta][command_name]
original_command[:syntax] << alias_command[:syntax]
alias_name = command_name(alias_command[:syntax])
alias_command[:is_public] = original_command[:is_public]
add_command_meta(alias_name, original_command, true)
add_command_spec(alias_command, callback)
end
# Add a command meta
def add_command_meta(name, command, is_alias=false) #:nodoc:
syntax = command[:syntax]
@commands[:meta][name] = {
:syntax => syntax.is_a?(Array) ? syntax : [syntax],
:description => command[:description],
:is_public => command[:is_public] || false,
:is_alias => is_alias
}
end
# Add a command spec
def add_command_spec(command, callback) #:nodoc:
@commands[:spec] << {
:regex => command[:regex],
:callback => callback,
:is_public => command[:is_public] || false
}
end
# Extract the command name from the given syntax
def command_name(syntax) #:nodoc:
if syntax.include? ' '
name = syntax.sub(/^(\S+).*/, '\1')
else
name = syntax
end
name
end
# Returns the default help message describing the bot's command repertoire.
# Commands are sorted alphabetically by name, and are displayed according
# to the bot's and the commands's _public_ attribute.
def help_message(sender, command_name) #:nodoc:
if command_name.nil? or command_name.length == 0
# Display help for all commands
help_message = "I understand the following commands:\n\n"
@commands[:meta].sort.each do |command|
# Thank you, Hash.sort
command = command[1]
if !command[:is_alias] and (command[:is_public] or master? sender)
command[:syntax].each { |syntax| help_message += "#{syntax}\n" }
help_message += " #{command[:description]}\n\n"
end
end
else
# Display help for the given command
command = @commands[:meta][command_name]
if command.nil?
help_message = "I don't understand '#{command_name}' Try saying" +
" 'help' to see what commands I understand."
else
help_message = ''
command[:syntax].each { |syntax| help_message += "#{syntax}\n" }
help_message += " #{command[:description]} "
end
end
help_message
end
# Parses the given command message for the presence of a known command by
# testing it against each known command's regex. If a known command is
# found, the command parameters are passed on to the callback block, minus
# the command trigger. If a String result is present it is delivered to the
# sender.
#
# If the bot has not been made public, commands from anyone other than the
# bot master(s) will be silently ignored.
def parse_command(sender, message) #:nodoc:
is_master = master? sender
if @config[:is_public] or is_master
@commands[:spec].each do |command|
if command[:is_public] or is_master
unless (message.strip =~ command[:regex]).nil?
params = nil
if message.include? ' '
params = message.sub(/^\S+\s+(.*)$/, '\1')
end
response = command[:callback].call(sender, params)
deliver(sender, response) unless response.nil?
return
end
end
end
response = "I don't understand '#{message.strip}' Try saying 'help' " +
"to see what commands I understand."
deliver(sender, response)
end
end
# Creates a new Thread dedicated to listening for incoming chat messages.
# When a chat message is received, the bot checks if the sender is its
# master. If so, it is tested for the presence commands, and processed
# accordingly. If the bot itself or the command issued is not made public,
# a message sent by anyone other than the bot's master is silently ignored.
#
# Only the chat message type is supported. Other message types such as
# error and groupchat are not supported.
def start_listener_thread #:nodoc:
listener_thread = Thread.new do
loop do
@jabber.received_messages do |message|
# Remove the Jabber resourse, if any
sender = message.from.to_s.sub(/\/.+$/, '')
if message.type == :chat
parse_thread = Thread.new do
parse_command(sender, message.body)
end
parse_thread.join
end
end
sleep 1
end
end
listener_thread.join
end
end
end