74 lines
2.4 KiB
Ruby
74 lines
2.4 KiB
Ruby
require 'posix-spawn'
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module RuCaptcha
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class Captcha
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class << self
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def rand_color
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[rand(100).to_s(8), rand(100).to_s(8), rand(100).to_s(8)]
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end
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def random_chars
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chars = SecureRandom.hex(RuCaptcha.config.len / 2).downcase
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chars.gsub!(/[0ol1]/i, (rand(8) + 2).to_s)
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chars
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end
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def rand_line_top(text_top, font_size)
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text_top + rand(font_size - text_top * 2)
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end
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# Create Captcha image by code
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def create(code)
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chars = code.split('')
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all_left = 20
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font_size = RuCaptcha.config.font_size
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full_height = font_size
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full_width = (font_size * chars.size)
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size = "#{full_width}x#{full_height}"
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half_width = full_width / 2
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full_height = full_height
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half_height = full_height / 2
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text_top = 10
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text_left = 0 - (font_size * 0.28).to_i
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stroke_width = (font_size * 0.08).to_i + 1
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text_width = (full_width / chars.size) + text_left
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label = "=#{' ' * (chars.size - 1)}="
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text_opts = []
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line_opts = []
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chars.each_with_index do |char, i|
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rgb = rand_color
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text_color = "rgba(#{rgb.join(',')}, 1)"
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line_color = "rgba(#{rgb.join(',')}, 0.6)"
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text_opts << %(-fill '#{text_color}' -draw 'text #{(text_left + text_width) * i + all_left},#{text_top} "#{char}"')
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left_y = rand_line_top(text_top, font_size)
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right_y = rand_line_top(text_top, font_size)
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line_opts << %(-draw 'stroke #{line_color} line #{rand(10)},#{left_y} #{half_width + rand(half_width / 2)},#{right_y}')
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end
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command = <<-CODE
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convert -size #{size} \
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-strokewidth #{stroke_width} \
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#{line_opts.join(' ')} \
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-pointsize #{font_size} -weight 500 \
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#{text_opts.join(' ')} \
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-wave #{rand(2) + 3}x#{rand(2) + 1} \
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-rotate #{rand(10) - 5} \
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-gravity NorthWest -sketch 1x10+#{rand(2)} \
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-fill white \
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-implode #{RuCaptcha.config.implode} label:- png:-
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CODE
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command.strip!
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pid, stdin, stdout, stderr = POSIX::Spawn.popen4(command)
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Process.waitpid(pid)
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err = stderr.read
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raise "RuCaptcha: #{err.strip}" if err != nil && err.length > 0
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stdout.read
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end
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end
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end
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end
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