path: root/lib/rbot/plugins.rb

module Irc
    BotConfig.register BotConfigArrayValue.new('plugins.blacklist',
      :default => [], :wizard => false, :requires_restart => true,
      :desc => "Plugins that should not be loaded")
module Plugins
  require 'rbot/messagemapper'

=begin
  base class for all rbot plugins
  certain methods will be called if they are provided, if you define one of
  the following methods, it will be called as appropriate:

  map(template, options)::
  map!(template, options)::
     map is the new, cleaner way to respond to specific message formats
     without littering your plugin code with regexps. The difference
     between map and map! is that map! will not register the new command
     as an alternative name for the plugin.

     Examples:

       plugin.map 'karmastats', :action => 'karma_stats'

       # while in the plugin...
       def karma_stats(m, params)
         m.reply "..."
       end

       # the default action is the first component
       plugin.map 'karma'

       # attributes can be pulled out of the match string
       plugin.map 'karma for :key'
       plugin.map 'karma :key'

       # while in the plugin...
       def karma(m, params)
         item = params[:key]
         m.reply 'karma for #{item}'
       end

       # you can setup defaults, to make parameters optional
       plugin.map 'karma :key', :defaults => {:key => 'defaultvalue'}

       # the default auth check is also against the first component
       # but that can be changed
       plugin.map 'karmastats', :auth => 'karma'

       # maps can be restricted to public or private message:
       plugin.map 'karmastats', :private false,
       plugin.map 'karmastats', :public false,
     end

  listen(UserMessage)::
                         Called for all messages of any type. To
                         differentiate them, use message.kind_of? It'll be
                         either a PrivMessage, NoticeMessage, KickMessage,
                         QuitMessage, PartMessage, JoinMessage, NickMessage,
                         etc.

  privmsg(PrivMessage)::
                         called for a PRIVMSG if the first word matches one
                         the plugin register()d for. Use m.plugin to get
                         that word and m.params for the rest of the message,
                         if applicable.

  kick(KickMessage)::
                         Called when a user (or the bot) is kicked from a
                         channel the bot is in.

  join(JoinMessage)::
                         Called when a user (or the bot) joins a channel

  part(PartMessage)::
                         Called when a user (or the bot) parts a channel

  quit(QuitMessage)::
                         Called when a user (or the bot) quits IRC

  nick(NickMessage)::
                         Called when a user (or the bot) changes Nick
  topic(TopicMessage)::
                         Called when a user (or the bot) changes a channel
                         topic

  connect()::            Called when a server is joined successfully, but
                         before autojoin channels are joined (no params)

  save::                 Called when you are required to save your plugin's
                         state, if you maintain data between sessions

  cleanup::              called before your plugin is "unloaded", prior to a
                         plugin reload or bot quit - close any open
                         files/connections or flush caches here
=end

  class Plugin
    attr_reader :bot   # the associated bot
    # initialise your plugin. Always call super if you override this method,
    # as important variables are set up for you
    def initialize
      @bot = Plugins.bot
      @names = Array.new
      @handler = MessageMapper.new(self)
      @registry = BotRegistryAccessor.new(@bot, self.class.to_s.gsub(/^.*::/, ""))
    end

    def flush_registry
      # debug "Flushing #{@registry}"
      @registry.flush
    end

    def cleanup
      # debug "Closing #{@registry}"
      @registry.close
    end

    def handle(m)
      @handler.handle(m)
    end

    def map(*args)
      @handler.map(*args)
      # register this map
      name = @handler.last.items[0]
      self.register name
      unless self.respond_to?('privmsg')
        def self.privmsg(m)
          handle(m)
        end
      end
    end

    def map!(*args)
      @handler.map(*args)
      # register this map
      name = @handler.last.items[0]
      self.register name, {:hidden => true}
      unless self.respond_to?('privmsg')
        def self.privmsg(m)
          handle(m)
        end
      end
    end

    # return an identifier for this plugin, defaults to a list of the message
    # prefixes handled (used for error messages etc)
    def name
      @names.join("|")
    end

    # return a help string for your module. for complex modules, you may wish
    # to break your help into topics, and return a list of available topics if
    # +topic+ is nil. +plugin+ is passed containing the matching prefix for
    # this message - if your plugin handles multiple prefixes, make sure you
    # return the correct help for the prefix requested
    def help(plugin, topic)
      "no help"
    end

    # register the plugin as a handler for messages prefixed +name+
    # this can be called multiple times for a plugin to handle multiple
    # message prefixes
    def register(name,opts={})
      raise ArgumentError, "Second argument must be a hash!" unless opts.kind_of?(Hash)
      return if Plugins.plugins.has_key?(name)
      Plugins.plugins[name] = self
      @names << name unless opts.fetch(:hidden, false)
    end

    # default usage method provided as a utility for simple plugins. The
    # MessageMapper uses 'usage' as its default fallback method.
    def usage(m, params = {})
      m.reply "incorrect usage, ask for help using '#{@bot.nick}: help #{m.plugin}'"
    end

  end

  # class to manage multiple plugins and delegate messages to them for
  # handling
  class Plugins
    # hash of registered message prefixes and associated plugins
    @@plugins = Hash.new
    # associated IrcBot class
    @@bot = nil

    # bot::     associated IrcBot class
    # dirlist:: array of directories to scan (in order) for plugins
    #
    # create a new plugin handler, scanning for plugins in +dirlist+
    def initialize(bot, dirlist)
      @@bot = bot
      @dirs = dirlist
      scan
    end

    # access to associated bot
    def Plugins.bot
      @@bot
    end

    # access to list of plugins
    def Plugins.plugins
      @@plugins
    end

    # load plugins from pre-assigned list of directories
    def scan
      @failed = Array.new
      @ignored = Array.new
      processed = Hash.new

      @@bot.config['plugins.blacklist'].each { |p|
        pn = p + ".rb"
        processed[pn.intern] = :blacklisted
      }

      dirs = Array.new
      dirs << Config::datadir + "/plugins"
      dirs += @dirs
      dirs.reverse.each {|dir|
        if(FileTest.directory?(dir))
          d = Dir.new(dir)
          d.sort.each {|file|

            next if(file =~ /^\./)

            if processed.has_key?(file.intern)
              @ignored << {:name => file, :dir => dir, :reason => processed[file.intern]}
              next
            end

            if(file =~ /^(.+\.rb)\.disabled$/)
              # GB: Do we want to do this? This means that a disabled plugin in a directory
              #     will disable in all subsequent directories. This was probably meant
              #     to be used before plugins.blacklist was implemented, so I think
              #     we don't need this anymore
              processed[$1.intern] = :disabled
              @ignored << {:name => $1, :dir => dir, :reason => processed[$1.intern]}
              next
            end

            next unless(file =~ /\.rb$/)

            tmpfilename = "#{dir}/#{file}"

            # create a new, anonymous module to "house" the plugin
            # the idea here is to prevent namespace pollution. perhaps there
            # is another way?
            plugin_module = Module.new

            begin
              plugin_string = IO.readlines(tmpfilename).join("")
              debug "loading plugin #{tmpfilename}"
              plugin_module.module_eval(plugin_string, tmpfilename)
              processed[file.intern] = :loaded
            rescue Exception => err
              # rescue TimeoutError, StandardError, NameError, LoadError, SyntaxError => err
              warning "plugin #{tmpfilename} load failed\n" + err.inspect
              debug err.backtrace.join("\n")
              bt = err.backtrace.select { |line|
                line.match(/^(\(eval\)|#{tmpfilename}):\d+/)
              }
              bt.map! { |el|
                el.gsub(/^\(eval\)(:\d+)(:in `.*')?(:.*)?/) { |m|
                  "#{tmpfilename}#{$1}#{$3}"
                }
              }
              msg = err.to_str.gsub(/^\(eval\)(:\d+)(:in `.*')?(:.*)?/) { |m|
                "#{tmpfilename}#{$1}#{$3}"
              }
              newerr = err.class.new(msg)
              newerr.set_backtrace(bt)
              # debug "Simplified error: " << newerr.inspect
              # debug newerr.backtrace.join("\n")
              @failed << { :name => file, :dir => dir, :reason => newerr }
              # debug "Failures: #{@failed.inspect}"
            end
          }
        end
      }
    end

    # call the save method for each active plugin
    def save
      delegate 'flush_registry'
      delegate 'save'
    end

    # call the cleanup method for each active plugin
    def cleanup
      delegate 'cleanup'
    end

    # drop all plugins and rescan plugins on disk
    # calls save and cleanup for each plugin before dropping them
    def rescan
      save
      cleanup
      @@plugins = Hash.new
      scan

    end

    def status(short=false)
      # Active plugins first
      if(@@plugins.length > 0)
        list = "#{length} plugin#{'s' if length > 1}"
        if short
          list << " loaded"
        else
          list << ": " + @@plugins.values.uniq.collect{|p| p.name}.sort.join(", ")
        end
      else
        list = "no plugins active"
      end
      # Ignored plugins next
      unless @ignored.empty?
        list << "; #{Underline}#{@ignored.length} plugin#{'s' if @ignored.length > 1} ignored#{Underline}"
        list << ": use #{Bold}help ignored plugins#{Bold} to see why" unless short
      end
      # Failed plugins next
      unless @failed.empty?
        list << "; #{Reverse}#{@failed.length} plugin#{'s' if @failed.length > 1} failed to load#{Reverse}"
        list << ": use #{Bold}help failed plugins#{Bold} to see why" unless short
      end
      list
    end

    # return list of help topics (plugin names)
    def helptopics
      return " [#{status}]"
    end

    def length
      @@plugins.values.uniq.length
    end

    # return help for +topic+ (call associated plugin's help method)
    def help(topic="")
      case topic
      when /fail(?:ed)?\s*plugins?.*(trace(?:back)?s?)?/
        # debug "Failures: #{@failed.inspect}"
        return "no plugins failed to load" if @failed.empty?
        return (@failed.inject(Array.new) { |list, p|
          list << "#{Bold}#{p[:name]}#{Bold} in #{p[:dir]} failed"
          list << "with error #{p[:reason].class}: #{p[:reason]}"
          list << "at #{p[:reason].backtrace.join(', ')}" if $1 and not p[:reason].backtrace.empty?
          list
        }).join("\n")
      when /ignored?\s*plugins?/
        return "no plugins were ignored" if @ignored.empty?
        return (@ignored.inject(Array.new) { |list, p|
          case p[:reason]
          when :loaded
            list << "#{p[:name]} in #{p[:dir]} (overruled by previous)"
          else
            list << "#{p[:name]} in #{p[:dir]} (#{p[:reason].to_s})"
          end
          list
        }).join(", ")
      when /^(\S+)\s*(.*)$/
        key = $1
        params = $2
        if(@@plugins.has_key?(key))
          begin
            return @@plugins[key].help(key, params)
          rescue Exception => err
            #rescue TimeoutError, StandardError, NameError, SyntaxError => err
            error "plugin #{@@plugins[key].name} help() failed: #{err.class}: #{err}"
            error err.backtrace.join("\n")
          end
        else
          return false
        end
      end
    end

    # see if each plugin handles +method+, and if so, call it, passing
    # +message+ as a parameter
    def delegate(method, *args)
      @@plugins.values.uniq.each {|p|
        if(p.respond_to? method)
          begin
            p.send method, *args
          rescue Exception => err
            #rescue TimeoutError, StandardError, NameError, SyntaxError => err
            error "plugin #{p.name} #{method}() failed: #{err.class}: #{err}"
            error err.backtrace.join("\n")
          end
        end
      }
    end

    # see if we have a plugin that wants to handle this message, if so, pass
    # it to the plugin and return true, otherwise false
    def privmsg(m)
      return unless(m.plugin)
      if (@@plugins.has_key?(m.plugin) &&
          @@plugins[m.plugin].respond_to?("privmsg") &&
          @@bot.auth.allow?(m.plugin, m.source, m.replyto))
        begin
          @@plugins[m.plugin].privmsg(m)
        rescue BDB::Fatal => err
          error "plugin #{@@plugins[m.plugin].name} privmsg() failed: #{err.class}: #{err}"
          error err.backtrace.join("\n")
          raise
        rescue Exception => err
          #rescue TimeoutError, StandardError, NameError, SyntaxError => err
          error "plugin #{@@plugins[m.plugin].name} privmsg() failed: #{err.class}: #{err}"
          error err.backtrace.join("\n")
        end
        return true
      end
      return false
    end
  end

end
end