Module: OPP::Base64URL

Defined in:
lib/opp/base64_url.rb

Constant Summary collapse

ALPHABET = 
/\A[A-Za-z0-9_-]*\z/

Class Method Summary collapse

Class Method Details

.decode(value, length: nil) ⇒ Object 



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# File 'lib/opp/base64_url.rb', line 13

def decode(value, length: nil)
  unless value.is_a?(String) && ALPHABET.match?(value)
    raise InvalidEncodingError, "invalid unpadded Base64url"
  end

  bytes = Base64.urlsafe_decode64(value.ljust((value.length + 3) / 4 * 4, "="))
  raise InvalidEncodingError, "non-canonical Base64url" unless encode(bytes) == value
  raise InvalidEncodingError, "expected #{length} bytes" if length && bytes.bytesize != length

  bytes
rescue ArgumentError => error
  raise InvalidEncodingError, error.message
end

.encode(bytes) ⇒ Object 



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# File 'lib/opp/base64_url.rb', line 9

def encode(bytes)
  Base64.urlsafe_encode64(bytes, padding: false)
end