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require 'tempfile'
module SimpleCaptcha #:nodoc
module ImageHelpers #:nodoc
mattr_accessor :image_styles
@@image_styles = {
'embosed_silver' => ['-fill darkblue', '-shade 20x60', '-background white'],
'simply_red' => ['-fill darkred', '-background white'],
'simply_green' => ['-fill darkgreen', '-background white'],
'simply_blue' => ['-fill darkblue', '-background white'],
'distorted_black' => ['-fill darkblue', '-edge 10', '-background white'],
'all_black' => ['-fill darkblue', '-edge 2', '-background white'],
'charcoal_grey' => ['-fill darkblue', '-charcoal 5', '-background white'],
'almost_invisible' => ['-fill red', '-solarize 50', '-background white']
}
DISTORTIONS = ['low', 'medium', 'high']
IMPLODES = { 'none' => 0, 'low' => 0.1, 'medium' => 0.2, 'high' => 0.3 }
DEFAULT_IMPLODE = 'medium'
class << self
def image_params(key = 'simply_blue')
image_keys = @@image_styles.keys
style = begin
if key == 'random'
image_keys[rand(image_keys.length)]
else
image_keys.include?(key) ? key : 'simply_blue'
end
end
@@image_styles[style]
end
def distortion(key='low')
key =
key == 'random' ?
DISTORTIONS[rand(DISTORTIONS.length)] :
DISTORTIONS.include?(key) ? key : 'low'
case key.to_s
when 'low' then return [0 + rand(2), 80 + rand(20)]
when 'medium' then return [2 + rand(2), 50 + rand(20)]
when 'high' then return [4 + rand(2), 30 + rand(20)]
end
end
def implode
IMPLODES[SimpleCaptcha.implode] || IMPLODES[DEFAULT_IMPLODE]
end
end
if RUBY_VERSION < '1.9'
class Tempfile < ::Tempfile
# Replaces Tempfile's +make_tmpname+ with one that honors file extensions.
def make_tmpname(basename, n = 0)
extension = File.extname(basename)
sprintf("%s,%d,%d%s", File.basename(basename, extension), $$, n, extension)
end
end
end
private
def generate_simple_captcha_image(simple_captcha_key) #:nodoc
amplitude, frequency = ImageHelpers.distortion(SimpleCaptcha.distortion)
text = Utils::simple_captcha_value(simple_captcha_key)
params = ImageHelpers.image_params(SimpleCaptcha.image_style).dup
params << "-size #{SimpleCaptcha.image_size}"
params << "-wave #{amplitude}x#{frequency}"
params << "-gravity Center"
params << "-pointsize 22"
params << "-implode #{ImageHelpers.implode}"
unless SimpleCaptcha.font.empty?
params << "-font #{SimpleCaptcha.font}"
end
params << "label:#{text}"
if SimpleCaptcha.noise and SimpleCaptcha.noise > 0
params << "-evaluate Uniform-noise #{SimpleCaptcha.noise}"
end
params << "jpeg:-"
SimpleCaptcha::Utils::run("convert", params.join(' '))
end
end
end
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