Module: Privy::Authorization::Canonicalization

Defined in:
lib/privy/authorization/canonicalization.rb

Class Method Summary collapse

Class Method Details

.canonicalize(value) ⇒ Object 



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# File 'lib/privy/authorization/canonicalization.rb', line 10

def canonicalize(value)
  serialize(coerce_keys(value))
end

.coerce_keys(value) ⇒ Object 



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# File 'lib/privy/authorization/canonicalization.rb', line 14

def coerce_keys(value)
  case value
  when Hash
    value.each_with_object({}) { |(k, v), h| h[k.to_s] = coerce_keys(v) }
  when Array
    value.map { |v| coerce_keys(v) }
  else
    value
  end
end

.format_number(value) ⇒ Object

TODO: port the ES6 ToString algorithm (ecma-262) for full RFC 8785 compliance on arbitrary floats. MVP payloads only contain integer and simple-decimal values, so the simplified form below is sufficient for now.



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# File 'lib/privy/authorization/canonicalization.rb', line 50

def format_number(value)
  int = value.to_i
  value == int ? int.to_s : value.to_s
end

.serialize(value) ⇒ Object 



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# File 'lib/privy/authorization/canonicalization.rb', line 25

def serialize(value)
  case value
  when Hash
    body = value.keys.sort_by { |k| k.encode("UTF-16BE").bytes }
                .map { |k| "#{JSON.generate(k)}:#{serialize(value[k])}" }
                .join(",")
    "{#{body}}"
  when Array
    "[#{value.map { |v| serialize(v) }.join(',')}]"
  when Float
    raise ArgumentError, "NaN/Infinity not permitted" unless value.finite?

    format_number(value)
  when Integer
    value.to_s
  when String, TrueClass, FalseClass, NilClass
    JSON.generate(value)
  else
    raise ArgumentError, "Cannot canonicalize #{value.class}"
  end
end