Class: Itsdangerousr::TimestampSigner

Inherits:
Signer
  • Object
show all
Defined in:
lib/itsdangerousr.rb

Instance Method Summary collapse

Methods inherited from Signer

#derive_key, #get_signature, #initialize, #validate, #verify_signature

Constructor Details

This class inherits a constructor from Itsdangerousr::Signer

Instance Method Details

#sign(value) ⇒ Object 



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# File 'lib/itsdangerousr.rb', line 123

def sign(value)
  timestamp = Itsdangerousr::base64_encode((Time.now.to_i - Itsdangerousr::EPOCH).to_s)
  value = value + @sep + timestamp
  value + @sep + get_signature(value)
end

#unsign(value, options = {}) ⇒ Object 



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# File 'lib/itsdangerousr.rb', line 129

def unsign(value, options={})
  defaults = {:max_age => nil, :return_timestamp => false}
  options = defaults.merge(options)
  @max_age = options[:max_age]
  @return_timestamp = options[:return_timestamp]
  begin
    result = super(value)
    sig_error = nil
  rescue BadSignature => e
    sig_error = e
    if e.payload.nil?
      result = e.paylod
    else
      result = ''
    end

  end

  unless result.include?(@sep)
    if sig_error
      raise sig_error
    end
    raise BadTimeSignature, 'Timestamp missing'
  end

  value, _, timestamp = result.rpartition(@sep)

  begin
    timestamp = Itsdangerousr::base64_decode(timestamp).to_i
  rescue StandardError
    timestamp = nil
  end

  unless sig_error.nil?
    raise BadTimeSignature.new(sig_error.message, value, timestamp)
  end

  if timestamp.nil?
    raise BadTimeSignature.new('Malformed timestamp', value)
  end

  unless @max_age.nil?
    age = (Time.now.to_i - Itsdangerousr::EPOCH) - timestamp.to_i
    if age > @max_age
      raise SignatureExpired.new("Signature age %s > %s seconds" % [age, @max_age], value,)
    end
  end

  if @return_timestamp
    return value, timestamp
  end
  value
end