Class: Nobi::TimestampSigner

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

Constant Summary collapse

EPOCH =

2011/01/01 in UTC

1293840000

Instance Method Summary collapse

Methods inherited from Signer

#derive_key, #initialize, #signature

Constructor Details

This class inherits a constructor from Nobi::Signer

Instance Method Details

#get_timestamp ⇒ Object 



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# File 'lib/nobi.rb', line 114

def get_timestamp
  Time.now.utc.to_f - EPOCH
end

#sign(value) ⇒ Object 



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# File 'lib/nobi.rb', line 122

def sign(value)
  timestamp = Utils.base64_encode(Utils.int_to_bytes(get_timestamp.to_i))
  value = '%s%s%s' % [value, @sep, timestamp]

  '%s%s%s' % [value, @sep, signature(value)]
end

#timestamp_to_datetime(ts) ⇒ Object 



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# File 'lib/nobi.rb', line 118

def timestamp_to_datetime(ts)
  Time.at(ts + EPOCH).utc
end

#unsign(value, max_age: nil, return_timestamp: nil) ⇒ Object 



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

def unsign(value, max_age: nil, return_timestamp: nil)
  sig_error = nil
  result = ''

  begin
    result = super(value)
  rescue BadSignature => e
    sig_error = e
  end

  if not result.include?(@sep)
    if sig_error
      raise sig_error
    else
      raise BadTimeSignature, 'timestamp missing'
    end
  end

  value, timestamp = Utils.rsplit(result, @sep)

  timestamp = Utils.bytes_to_int(Utils.base64_decode(timestamp))

  if max_age
    age = get_timestamp - timestamp

    if age > max_age
      raise SignatureExpired, 'Signature age %s > %s seconds' % [age, max_age]
    end
  end

  if return_timestamp
    return value, timestamp_to_datetime(timestamp)
  else
    return value
  end
end