Class: Flatulent

Inherits:
Object show all
Defined in:
lib/flatulent.rb

Defined Under Namespace

Classes: EncryptionError, Error, TimeBombError

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(arg = {}) ⇒ Flatulent

–{{{



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# File 'lib/flatulent.rb', line 256

def initialize arg = {}   #--{{{
  if Hash === arg
    opt = getopts arg 
    @size = Integer opt[ 'size', 4 ]
    @string = String opt[ 'string', generate_random_string ]
  else
    opt = getopts Hash.new 
    @string = String arg
    @size = @string.size 
  end

  @font = String opt[ 'font', 'big' ]
  @noise = Float opt[ 'noise', 0.05 ]
  @transform = Float opt[ 'transform', 0.03 ]
  @id = String opt[ 'id', 'flatulent' ]
  @action = String opt[ 'action' ]
  @ttl = Integer opt[ 'ttl', 300 ]
  @horizontal_fudge_factor = Integer opt[ 'horizontal_fudge_factor', 4 ]
  @vertical_fudge_factor = Integer opt[ 'vertical_fudge_factor', 4 ]

  @vapour_chars = Integer opt[ 'vapour_chars', 5 * @size ]
  @vapour_level = Float opt[ 'vapour_level', 0.77 ]
  
  figlet!
  vapour!
  captcha!
  element!
  form_tags!
  form!
end

Class Method Details

.libdir ⇒ Object 



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# File 'lib/flatulent.rb', line 3

def self.libdir() File.expand_path(__FILE__).gsub(%r/\.rb$/, '') end

.version ⇒ Object 



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# File 'lib/flatulent.rb', line 2

def self.version() '0.0.4' end

Instance Method Details

#captcha! ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 424

def captcha!  #--{{{
  figlet = @figlet.dup
  chars = figlet.split %r""
  hammer chars
  figlet = chars.join
  space = " "[0]
  newline = "\n"[0]

  @captcha = " " * figlet.size
  # merge vapour with figlet
  figlet.size.times do |i|
    fbyte = figlet[i]
    vbyte = @vapour[i]

    if fbyte == newline
      @captcha[i] = newline
    elsif fbyte == space
      @captcha[i] = vbyte 
    else
      @captcha[i] = fbyte 
    end
  end
  @captcha
end

#css ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 538

def css  #--{{{
  css_for style
end

#css_for(hash) ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 542

def css_for hash  #--{{{
  hash.map{|kv| kv.join ':' }.join ';'
end

#element! ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 483

def element!  #--{{{
  rows = []
  rows << (row = [])
  chars = @captcha.split %r//
  #chars = @figlet.split %r//
  size = chars.size
  last = size - 1

  chars.each_with_index do |char, idx|
    content = 
      case char 
      when %r/\n/o
        #"<br>"
        "\n"
      when %r/\s/o
        #"&nbsp;"
        " "
      when %r/([^\s])/o
        CGI.escapeHTML $1 
      end
      #Array.new(rand(10)){ content = "<span>#{ content }</span>"}
      row << content 
      rows << (row = []) unless idx == last 
  end

  content = rows.join
    #<table width='50%' border=1 bgcolor='#{ style["background"] }'><tr><td>
   #</td></tr></table>
  @element = <<-html
      <div id='#{ @id }_element' style='#{ css }'>#{ content }</div>
  html
end

#encrypt(string) ⇒ Object

–{{{



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# File 'lib/flatulent.rb', line 562

def encrypt string  #--{{{
  self.class.encrypt string.to_s
end

#encrypted ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 566

def encrypted  #--{{{
  self.class.encrypt @string
end

#figlet! ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 307

def figlet!  #--{{{
  #spaced = @string.split(%r//).join #' ' #.join('  ')
  fontfile = File.join fontdir, "#{ @font }.flf"
  font = Text::Figlet::Font.new fontfile
  typesetter = Text::Figlet::Typesetter.new font

  @figlets = []
  chars = @string.split %r//
  #chars.each{|char| @figlets << typesetter[char]}

  # horz fudge
  chars.each do |char|
    figlet = typesetter[char]
    rows = figlet.split %r/\n/
    height = rows.size
    offset_l = " " * rand(@horizontal_fudge_factor) 
    offset_r = " " * rand(@horizontal_fudge_factor) 
    rows.size.times do |i|
      rows[i] = "#{ offset_l }#{ rows[i] }#{ offset_r }"
    end
    @figlets.push rows
  end

  # vert fudge
  @figlets.map! do |rows|
    width = rows.first.size
    offset_t = Array.new(rand(@vertical_fudge_factor)).map{ " " * width }
    offset_b = Array.new(rand(@vertical_fudge_factor)).map{ " " * width }
    offset_t + rows + offset_b
  end

  # vert normalize vert
  tallest = @figlets.map{|rows| rows.size}.max
  @figlets.size.times do |i|
    rows = @figlets[i]
    unless rows.size == tallest
      width = rows.first.size
      until rows.size == tallest
        blank = " " * width
        rows << blank
      end
    end
  end

  # generate final grid
  grid = []
  grid << (gridrow = '') 
  catch :done do
    loop do
      @figlets.each do |rows|
        row = rows.shift || throw(:done) 
        gridrow << row
      end
      #gridrow << "\n"
      grid << (gridrow = '') 
    end
  end

  # trim top and bottom iff emtpy
=begin
  empty = lambda{|row| not rnow.detect{|cell| cell !~ %r"br|nbsp"}}
  grid.delete_if{|row| row.strip.empty?}
=end

  @figlet_width = grid.first.size
  @figlet_height = grid.size
  @figlet = grid.join("\n")
end

#form! ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 574

def form!  #--{{{
  action = "action='#{ @action }'"
  @form = <<-html
    <form method='post' #{ action }>
      #{ form_tags }
      <input type='submit' name='#{ @id }[submit]' id='#{ @id }_submit' value='Submit' />
    </form>
  html
end

#form_tags! ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 546

def form_tags!  #--{{{
  n = @string.scan(%r/\w/).size
  string = @string
  timebomb = Time.now.utc.to_i + @ttl
  @form_tags = <<-html
    #{ element }
    <p id='#{ @id }_instructions'>
      Please enter the #{ n } large characters (A-Z, 1-9) shown.
    </p>
    <input type='textarea' name='#{ @id }[c]' id='#{ @id }_textarea' />
    <input type='hidden' name='#{ @id }[s]' id='#{ @id }_e' value='#{ encrypt string }' />
    <input type='hidden' name='#{ @id }[t]' id='#{ @id }_v' value='#{ encrypt timebomb }' />
  html
end

#generate_random_string ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 292

def generate_random_string  #--{{{
  chars = []
  n = random_charset.size - 1
  loop {
    ( chars << random_charset[rand(n)] ).uniq!
    break if chars.size >= @size or random_charset.size == chars.size
  }
  chars
end

#getopts(options) ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 592

def getopts options  #--{{{
  self.class.getopts options
end

#hammer(chars) ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 449

def hammer chars #--{{{
  # transform character chars
  newline = "\n"[0]
  space = " "[0]
  alphas = ('A'..'Z').to_a + ('a'..'z').to_a
  transform = {
    '|'  => rchar(%w'. * + , ; : ' + alphas),
    '/'  => rchar(%w'] [ { } ( ) @' + alphas),
    '\\' => rchar(%w'/ ] [ { } ( ) @' + alphas),
    '-'  => rchar(%w'_ * ^ # @ ~'),
    '_'  => rchar(%w'- * ^ # @ ~'),
    '('  => rchar(%w'/ ] [ { } ) @' + alphas),
    ')'  => rchar(%w'/ ] [ { } ( @' + alphas),
  }
  to_transform = 
    (0 ... chars.size).to_a.select{|i| chars[i] !~ %r"\s"}.sort_by{ rand }
  to_transform = to_transform.first((to_transform.size * @transform).ceil)
  to_transform.each do |i|
    char = chars[i]
    chars[i] = (transform[char] || lambda{char}).call
  end

  # background noise
  to_noise = 
    (0 ... chars.size).to_a.select{|i| chars[i] =~ %r" "}.sort_by{ rand }
  to_noise = to_noise.first((to_noise.size * @noise).ceil)
  noisy = %w`| / ( ) \\ ! [ ] < > ^ v V` 
  noise = lambda{|*a| noisy[ rand(noisy.size) ]}
  to_noise.each do |i|
    char = chars[i]
    chars[i] = noise[char]
  end
end

#image(options = {}) ⇒ Object 



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# File 'lib/flatulent.rb', line 518

def image options = {}
  require 'RMagick'

  grid = captcha.split(%r"\n").map{|row| row.split %r""}

  width = grid.first.size
  height = grid.size 

  img = Magick::Image.new width, height

  img
end

#munge(string) ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 570

def munge string  #--{{{
  self.class.munge string
end

#random_char ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 302

def random_char  #--{{{
  n = random_charset.size - 1
  random_charset[rand(n)]
end

#random_charset ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 287

def random_charset  #--{{{
  return @random_charset if defined? @random_charset
  @random_charset = ('A' .. 'Z').to_a + ('1' .. '9').to_a
end

#rchar(*list) ⇒ Object

–{{{



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# File 'lib/flatulent.rb', line 532

def rchar *list  #--{{{
  list = list.flatten.sort_by{ rand }
  n = list.size - 1
  lambda{list[ rand(n) ]}
end

#to_s ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 588

def to_s  #--{{{
  form
end

#vapour! ⇒ Object

–}}}



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# File 'lib/flatulent.rb', line 376

def vapour!  #--{{{
  #spaced = @string.split(%r//).join #' ' #.join('  ')
  fontfile = File.join fontdir, "#{ @font }.flf"
  font = Text::Figlet::Font.new fontfile
  typesetter = Text::Figlet::Typesetter.new font

  grid = Array.new(@figlet_height).map{ Array.new(@figlet_width){ " " } } 
  width = grid.first.size
  height = grid.size

  @vapour_chars.times do
    figlet = typesetter[random_char]

    idxs = []
    space = " "[0]
    newline = "\n"[0] 
    i = 0
    figlet.each_byte do |byte|
      idxs << i unless byte == space or byte == newline
      i += 1
    end
#p idxs
    to_vapourize = idxs.sort_by{ rand }.first((idxs.size * @vapour_level).ceil) 
#p to_vapourize
    to_vapourize.each{|idx| figlet[idx] = " "}
#puts figlet

    figlet_grid = [] and figlet.each_line do |line|
      figlet_grid << line.chomp.split(%r"")
    end

    xoff = rand(width - 1)
    yoff = rand(height - 1)

    figlet_grid.each_with_index do |row, y|
      row.each_with_index do |char, x|
        j = y + yoff
        i = x + xoff
        next if j >= height or i >= width
        next if char == " "
        grid[ y + yoff ][ x + xoff ] = char
      end
    end
  end

  @vapour = grid.map{|row| row.join}.join("\n")
end