Module: Remit::Signature

Included in:
API, GetPipeline::Pipeline
Defined in:
lib/remit2/signature.rb

Instance Method Summary collapse

Instance Method Details

#sign(secret_key, endpoint, http_verb, params) ⇒ Object 



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# File 'lib/remit2/signature.rb', line 3

def sign(secret_key, endpoint, http_verb, params)
  s = string_to_sign(endpoint, http_verb, params)
  Base64.encode64(OpenSSL::HMAC.digest(OpenSSL::Digest::SHA256.new, secret_key, s)).strip
end

#string_to_sign(endpoint, http_verb, values) ⇒ Object 



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# File 'lib/remit2/signature.rb', line 8

def string_to_sign(endpoint, http_verb, values)
  uri = URI::parse(endpoint.to_s)

  path = uri.path
  path = "/" if (path.nil? || path.empty?)
  path = urlencode(path).gsub("%2F", "/") 

  host = uri.host.downcase
  
  # Explicitly remove the Signature param if found
  sorted_keys = values.keys.reject{ |k| k.to_s == "Signature" }.sort { |x,y| x.to_s <=> y.to_s }
  converted = sorted_keys.collect do |k|
    v = values[k]
    s = urlencode(k)
    s << "=#{urlencode(v)}" unless v.nil?
    s
  end
  params = converted.join("&")
  
  "#{http_verb}\n#{host}\n#{path}\n#{params}"
end

#urlencode(plaintext) ⇒ Object

Convert a string into URL encoded form that Amazon accepts



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# File 'lib/remit2/signature.rb', line 31

def urlencode(plaintext)
  CGI.escape(plaintext.to_s).gsub("+", "%20").gsub("%7E", "~")
end