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Contents
module KrakenClient
module Requests
module Content
class Header
attr_accessor :config, :endpoint_name, :options, :url
def initialize(config, endpoint_name, options, url)
@config = config
@endpoint_name = endpoint_name
@url = url
@options = options
@options[:nonce] = nonce
end
def call
{
'API-Key' => config.api_key,
'API-Sign' => generate_signature,
}
end
private
## Security
# Generate a 64-bit nonce where the 48 high bits come directly from the current
# timestamp and the low 16 bits are pseudorandom. We can't use a pure [P]RNG here
# because the Kraken API requires every request within a given session to use a
# monotonically increasing nonce value. This approach splits the difference.
def nonce
high_bits = (Time.now.to_f * 10000).to_i << 16
low_bits = SecureRandom.random_number(2 ** 16) & 0xffff
(high_bits | low_bits).to_s
end
def encoded_options
uri = Addressable::URI.new
uri.query_hash = options
uri.query
end
def generate_signature
key = Base64.decode64(config.api_secret)
message = generate_message
generate_hmac(key, message)
end
def generate_message
digest = OpenSSL::Digest.new('sha256', options[:nonce] + encoded_options).digest
url.split('.com').last + digest
end
def generate_hmac(key, message)
Base64.strict_encode64(OpenSSL::HMAC.digest('sha512', key, message))
end
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems