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Generate stoken and attach it as a data attribute #132

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Jul 20, 2015
Merged

Generate stoken and attach it as a data attribute #132

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19 changes: 15 additions & 4 deletions lib/recaptcha/client_helper.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -63,20 +63,31 @@ def v1_tags(options)
end

def v2_tags(options)
key = options[:public_key] ||= Recaptcha.configuration.public_key
raise RecaptchaError, "No public key specified." unless key
public_key = options[:public_key] ||= Recaptcha.configuration.public_key
raise RecaptchaError, "No public key specified." unless public_key
private_key = options[:private_key] ||= Recaptcha.configuration.private_key
raise RecaptchaError, "No private key specified." unless private_key
error = options[:error] ||= ((defined? flash) ? flash[:recaptcha_error] : "")
uri = Recaptcha.configuration.api_server_url(options[:ssl])
uri += "?hl=#{options[:hl]}" unless options[:hl].blank?

v2_options = options.slice(:theme, :type, :callback, :expired_callback).map {|k,v| %{data-#{k.to_s.gsub(/_/,'-')}="#{v}"} }.join(" ")

stoken_json = hash_to_json({'session_id' => SecureRandom.uuid, 'ts_ms' => (Time.now.to_f * 1000).to_i})
cipher = OpenSSL::Cipher::AES128.new(:ECB)
private_key_digest = Digest::SHA1.digest(private_key)[0...16]

cipher.encrypt
cipher.key = private_key_digest
encrypted_stoken = cipher.update(stoken_json) << cipher.final
encoded_stoken = Base64.urlsafe_encode64(encrypted_stoken).gsub(/\=+\Z/, '')

html = ""
html << %{<script src="#{uri}" async defer></script>\n}
html << %{<div class="g-recaptcha" data-sitekey="#{key}" #{v2_options}></div>\n}
html << %{<div class="g-recaptcha" data-sitekey="#{public_key}" data-stoken="#{encoded_stoken}" #{v2_options}></div>\n}

unless options[:noscript] == false
fallback_uri = "#{uri.chomp('.js')}/fallback?k=#{key}"
fallback_uri = "#{uri.chomp('.js')}/fallback?k=#{public_key}"
html << %{<noscript>}
html << %{<div style="width: 302px; height: 352px;">}
html << %{ <div style="width: 302px; height: 352px; position: relative;">}
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