Module: Sigstore::Internal::JSON

Defined in:
lib/sigstore/internal/json.rb

Class Method Summary collapse

Class Method Details

.canonical_generate(data, buffer = +"")) ⇒ Object

Implements wiki.laptop.org/go/Canonical_JSON



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# File 'lib/sigstore/internal/json.rb', line 21

def self.canonical_generate(data, buffer = +"")
  case data
  when NilClass
    buffer << "null"
  when TrueClass
    buffer << "true"
  when FalseClass
    buffer << "false"
  when Integer
    buffer << data.to_s
  when String
    buffer << '"' << data.gsub(/(["\\])/, '\\\\\1') << '"'
  when Array
    buffer << "["
    data.each_with_index do |v, i|
      buffer << "," unless i.zero?
      canonical_generate(v, buffer)
    end
    buffer << "]"
  when Hash
    contents = data.sort_by do |k, _|
      raise ArgumentError, "Non-string key in hash" unless k.is_a?(String)

      k.encode("utf-16").codepoints
    end
    buffer << "{"
    comma = false
    contents.each do |k, v|
      if comma
        buffer << ","
      else
        comma = true
      end
      canonical_generate(k, buffer)
      buffer << ":"
      canonical_generate(v, buffer)
    end
    buffer << "}"
  else
    raise ArgumentError, "Unsupported data type: #{data.class}"
  end
end