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config_store.rb

# original Ruby Twitter Gem : example/helper/config_store.rb
# modified at 2009/08/13

require 'yaml'

class ConfigStore
  attr_reader :file

  def initialize(file)
    @file = file
		load
  end

  def load
    if(@config == nil)
      if(File::exist?(file))
        @config ||= YAML::load(open(file))
      else
        @config = {}
      end
    end
    self
  end

  def [](key)
    load
    @config[key]
  end

  def []=(key, value)
    load
    @config[key] = value
  end

  def delete(*keys)
    keys.each { |key| @config.delete(key) }
    save
    self
  end

  def update(c={})
    @config.merge!(c)
    save
    self
  end

  def save
    File.open(file, 'w') { |f| f.write(YAML.dump(@config)) }
    self
  end
end

cron.rb

#coding: utf-8

#$KCODE = 'u'

Dir.chdir(File.dirname(__FILE__))

require 'kconv'
require 'rubygems'
require 'twitter'
require 'cairo'
require_relative 'config_store'

# constants
Original_img = 'Charlotte_204.png'
#Original_beem_img = 'Charlotte_beem_204.png'
New_img = 'Charlotte_204_comment.png'
$Config = ConfigStore.new("config.yaml")

def main
  
  #oauth   = Twitter::OAuth.new($Config['ctoken'], $Config['csecret'])
  #oauth.authorize_from_access($Config['atoken'],$Config['asecret'])
  #twitter = Twitter::Base.new(oauth)
  
  twitter = Twitter.new(
    :consumer_key => $Config['ctoken'],
    :consumer_secret => $Config['csecret'],
    :oauth_token => $Config['atoken'],
    :oauth_token_secret => $Config['asecret']
  )

  # check command
  last_id = $Config['Last_id'] || 0
  nlast_id = last_id
  owner = twitter.verify_credentials.screen_name
  setter = nil
  comment = nil
  twitter.mentions.each do |m|
    if(m.id <= last_id)
      break
    else
      nlast_id = m.id if(nlast_id < m.id)
    end
    puts m.text
    if(m.text =~ /^@#{owner}[ 　]+(icon|(アイコン|あいこん)(変えて|かえて)?)[^ 　]*[ 　]+(.+)/)
      setter = m.user.screen_name
      allowlist = getwhitelist(twitter,owner,"white")
      if(allowlist.index(setter))# || true)
        comment = $4.toutf8
        #break;
      else
        twitter.update("@#{m.user.screen_name} ( ╹◡╹)＜ おことわりしますっ",:in_reply_to_status_id=>m.id)
      end
    end
  end
  $Config['Last_id'] = nlast_id
  exit if !comment
  comment = $1 if(comment =~ /"(.*)"/)
  comment = $1 if(comment =~ /'(.*)'/)

  # generate image
  #if comment.include?("ビーム")
  #  img_filename = Original_beem_img
  #else
    img_filename = Original_img
  #end
  surface = Cairo::ImageSurface.from_png(img_filename)
  context = Cairo::Context.new(surface)

  #context.set_source_color(Cairo::Color.parse("#22337e"))
  context.set_source_color(Cairo::Color.parse("#bc353c")) #charlotte
  #context.set_source_color(Cairo::Color.parse("#000000"))
  #context.move_to(115,80) #charlotte
  context.move_to(125,80)
  context.rotate(-0.30)
  ## set font size
  max = 30
  width = 65
  context.set_font_size(max)
  if((w = context.text_extents(comment).width) > width)
    size = max * width / w
    context.set_font_size(size)
  end
  context.select_font_face("YukarryAA",0,0)
  context.show_text(comment)

  surface.write_to_png(New_img)

  # update image
  File.open(New_img) do |img|
    twitter.update_profile_image(img)
  end
  
  # post message
  r = rand(5)
  s_msg = ""
  if(r == 0)
    s_msg = "(✿╹◡╹)＜ #{comment}"
  else
    s_msg = "( ╹◡╹)＜ #{comment}"
  end
  #s_msg = "＼#{comment}！／"
  twitter.update(s_msg)
  
  File.open('cron.log','a') do |file|
    file.puts "comment=#{comment},setter=#{setter}"
  end
  
end

def getwhitelist(twitter,owner,slug)
  arr = []
  cursor = -1
  begin
    res = twitter.list_members(owner,slug,{:cursor=>cursor})
    res.users.each do |item|
      arr << item.screen_name
    end
    cursor = res.next_cursor
  end while cursor != 0
  return arr
end

# finalize
END{
  $Config.save
}


# call main
begin
  main
rescue => e
  File.open('cron.log','a') do |file|
    puts e.message
    file.puts e.message
    file.puts e.backtrace
  end
rescue Timeout::Error => e
  File.open('cron.log','a') do |file|
    file.puts e.inspect
    file.puts e.message
  end
end