Guillaume Dott
04e016c188
The text field id has to be unique for when you want two different captchas on the same page.
86 lines
2.3 KiB
Ruby
86 lines
2.3 KiB
Ruby
require 'rmagick'
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require 'base64'
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module ReallySimpleCaptcha::Captcha
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module PlainCaptcha
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DEFAULT_OPTIONS = {
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width: 120,
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height: 40,
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wave_amplitude: 4.0,
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wave_length: 60.0,
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implode_amount: 0.3,
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pointsize: 22,
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text_fill: 'darkblue',
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background_color: 'white'
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}
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include ActiveSupport::Configurable
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config_accessor :field_name
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config_accessor :width
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config_accessor :height
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config_accessor :implode_amount
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config_accessor :wave_amplitude
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config_accessor :wave_length
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config_accessor :pointsize
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config_accessor :fill
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config_accessor :background_color
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config_accessor :text_length
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config.field_name = :plain_captcha
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config.text_length = 6
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def self.configure(&block)
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yield config
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end
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module ViewHelpers
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def plain_captcha_tag
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session[PlainCaptcha.field_name] = ReallySimpleCaptcha::Util.random_string(PlainCaptcha.text_length)
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image = PlainCaptcha.generate_image(session[:plain_captcha],
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PlainCaptcha.config.select { |k,v| DEFAULT_OPTIONS.has_key?(k) })
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content_tag :div, class: 'plain_captcha' do
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html = image_tag "data:image/gif;base64,#{image}", alt: "Captcha"
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html.concat text_field_tag PlainCaptcha.field_name, nil, id: "reverse_captcha_#{Time.now.nsec}", required: 'required', autocomplete: 'off'
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html
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end
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end
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end
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module ControllerHelpers
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def plain_captcha_valid?
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return true if Rails.env.test?
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res = params[PlainCaptcha.field_name] == session[PlainCaptcha.field_name]
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session[PlainCaptcha.field_name] = nil
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res
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end
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end
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def self.generate_image(captcha_text, args={})
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options = DEFAULT_OPTIONS.merge(args)
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image = ::Magick::Image.new(options[:width], options[:height]) do
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self.background_color = options[:background_color]
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end
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text = ::Magick::Draw.new do
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self.pointsize = options[:pointsize]
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self.gravity = ::Magick::CenterGravity
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self.fill = options[:text_fill]
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end
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text.annotate(image, 0, 0, 0, 0, captcha_text)
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image = image.implode(options[:implode_amount]).wave(options[:wave_amplitude], options[:wave_length])
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Base64.strict_encode64(image.to_blob { self.format = 'GIF' })
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end
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end
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end
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