class JWT::Decode

Decoding logic for JWT

Attributes

header[R]
payload[R]
signature[R]

Public Class Methods

base64url_decode(str) click to toggle source
# File lib/jwt/decode.rb, line 10
def self.base64url_decode(str)
  str += '=' * (4 - str.length.modulo(4))
  Base64.decode64(str.tr('-_', '+/'))
end
new(jwt, verify) click to toggle source
# File lib/jwt/decode.rb, line 15
def initialize(jwt, verify)
  @jwt = jwt
  @verify = verify
  @header = ''
  @payload = ''
  @signature = ''
end

Public Instance Methods

decode_segments() click to toggle source
# File lib/jwt/decode.rb, line 23
def decode_segments
  header_segment, payload_segment, crypto_segment = raw_segments
  @header, @payload = decode_header_and_payload(header_segment, payload_segment)
  @signature = Decode.base64url_decode(crypto_segment.to_s) if @verify
  signing_input = [header_segment, payload_segment].join('.')
  [@header, @payload, @signature, signing_input]
end

Private Instance Methods

decode_header_and_payload(header_segment, payload_segment) click to toggle source
# File lib/jwt/decode.rb, line 40
def decode_header_and_payload(header_segment, payload_segment)
  header = JSON.parse(Decode.base64url_decode(header_segment))
  payload = JSON.parse(Decode.base64url_decode(payload_segment))
  [header, payload]
rescue JSON::ParserError
  raise JWT::DecodeError, 'Invalid segment encoding'
end
raw_segments() click to toggle source
# File lib/jwt/decode.rb, line 33
def raw_segments
  segments = @jwt.split('.')
  required_num_segments = @verify ? [3] : [2, 3]
  raise(JWT::DecodeError, 'Not enough or too many segments') unless required_num_segments.include? segments.length
  segments
end