module Buckaruby::Signature
Calculate a signature based on the parameters of the payment request or response. -> see BPE 3.0 Gateway
NVP, chapter 4 'Digital Signature'
Constants
- CHAR_ORDER
Excerpt from the Buckaroo documentation, chapter 4 'Digital Signature':
In the payment engine, the used lexical sort algorithm uses the following order: symbols first, then numbers, then case insensitive letters. Also, a shorter string that is identical to the beginning of a longer string, comes before the longer string. Take for example the following, comma separated, list which has been sorted: a_a, a0, a0a, a1a, aaA, aab, aba, aCa
Public Instance Methods
generate_signature(params, config)
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# File lib/buckaruby/signature.rb, line 11 def generate_signature(params, config) case config.hash_method when :sha1 Digest::SHA1.hexdigest(generate_signature_string(params, config.secret)) when :sha256 Digest::SHA256.hexdigest(generate_signature_string(params, config.secret)) when :sha512 Digest::SHA512.hexdigest(generate_signature_string(params, config.secret)) else raise ArgumentError, "Invalid hash method provided: #{config.hash_method}" end end
generate_signature_string(params, secret)
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# File lib/buckaruby/signature.rb, line 24 def generate_signature_string(params, secret) sign_params = params.select { |key, _value| key.to_s.upcase.start_with?("BRQ_", "ADD_", "CUST_") && key.to_s.casecmp("BRQ_SIGNATURE").nonzero? } sign_params = order_signature_params(sign_params) string = sign_params.map { |param| "#{param[0]}=#{param[1]}" }.join string << secret string end
order_signature_params(params)
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# File lib/buckaruby/signature.rb, line 41 def order_signature_params(params) params.sort_by do |key, _value| key.to_s.downcase.each_char.map { |c| CHAR_ORDER.index(c) } end end