Class: RuCaptcha::Captcha

Inherits:
Object
  • Object
show all
Defined in:
lib/rucaptcha/captcha.rb

Class Method Summary collapse

Class Method Details

.create(code) ⇒ Object

Create Captcha image by code



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# File 'lib/rucaptcha/captcha.rb', line 30

def create(code)
  chars        = code.split('')
  all_left     = 20
  font_size    = RuCaptcha.config.font_size
  full_height  = font_size
  full_width   = font_size * chars.size
  size         = "#{full_width}x#{full_height}"
  half_width   = full_width / 2
  text_top     = 0
  text_left    = 0 - (font_size * 0.28).to_i
  stroke_width = (font_size * 0.05).to_i + 1
  text_width   = font_size + text_left
  text_opts    = []
  line_opts    = []

  rgbs = []
  chars.count.times do |i|
    color = random_color
    if i > 0
      preview_color = rgbs[i - 1]
      # Avoid color same as preview color
      if color.index(color.min) == preview_color.index(preview_color.min) &&
         color.index(color.max) == preview_color.index(preview_color.max)
        # adjust RGB order
        color = [color[1], color[2], color[0]]
      end
    end
    rgbs << color
  end

  chars.each_with_index do |char, i|
    rgb = RuCaptcha.config.style == :colorful ? rgbs[i] : rgbs[0]
    text_color = "rgba(#{rgb.join(',')}, 1)"
    line_color = "rgba(#{rgb.join(',')}, 0.6)"
    text_opts << %(-fill '#{text_color}' -draw 'text #{(text_left + text_width) * i + all_left},#{text_top} "#{char}"')
    left_y = rand_line_top(text_top, font_size)
    right_x = half_width + (half_width * 0.3).to_i
    right_y = rand_line_top(text_top, font_size)
    line_opts << %(-draw 'stroke #{line_color} line #{rand(10)},#{left_y} #{right_x},#{right_y}')
  end

  command = "    convert -size \#{size} \\\n    -strokewidth \#{stroke_width} \\\n    \#{line_opts.join(' ')} \\\n    -pointsize \#{font_size} -weight 500 \\\n    \#{text_opts.join(' ')}  \\\n    -wave \#{rand(2) + 3}x\#{rand(2) + 1} \\\n    -rotate \#{rand(10) - 5} \\\n    -gravity NorthWest -sketch 1x10+\#{rand(2)} \\\n    -fill none \\\n    -implode \#{RuCaptcha.config.implode} -trim label:- png:-\n  CODE\n\n  if Gem.win_platform?\n    png_file_path = Rails.root.join('tmp', 'cache', \"\#{code}.png\")\n    command = \"convert -size \#{size} xc:White -gravity Center -weight 12 -pointsize 20 -annotate 0 \\\"\#{code}\\\" -trim \#{png_file_path}\"\n    out, err, _st = Open3.capture3(command)\n    warn \"  RuCaptcha \#{err.strip}\" if err.present?\n    png_file_path\n  else\n    command.strip!\n    out, err, _st = Open3.capture3(command)\n    warn \"  RuCaptcha \#{err.strip}\" if err.present?\n    out\n  end\nend\n"

.rand_line_top(text_top, font_size) ⇒ Object 



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# File 'lib/rucaptcha/captcha.rb', line 25

def rand_line_top(text_top, font_size)
  text_top + rand(font_size * 0.7).to_i
end

.random_chars ⇒ Object 



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# File 'lib/rucaptcha/captcha.rb', line 19

def random_chars
  chars = SecureRandom.hex(RuCaptcha.config.len / 2).downcase
  chars.gsub!(/[0ol1]/i, (rand(8) + 2).to_s)
  chars
end

.random_color ⇒ Object 



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# File 'lib/rucaptcha/captcha.rb', line 6

def random_color
  if RuCaptcha.config.style == :colorful
    color1 = rand(56) + 15
    color2 = rand(10) + 140
    color = [color1, color2, rand(15)]
    color.shuffle!
    color
  else
    color_seed = rand(40) + 10
    [color_seed, color_seed, color_seed]
  end
end

.warn(msg) ⇒ Object 



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# File 'lib/rucaptcha/captcha.rb', line 98

def warn(msg)
  msg = "  RuCaptcha #{msg}"
  Rails.logger.error(msg)
end