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Contents
module Twilio
module Security
class RequestValidator
def initialize(auth_token = nil)
@auth_token = auth_token || Twilio.auth_token
raise ArgumentError, 'Auth token is required' if @auth_token.nil?
end
def validate(url, params, signature)
params_hash = params_to_hash(params)
expected = build_signature_for(url, params_hash)
secure_compare(expected, signature)
end
def build_signature_for(url, params)
data = url + params.sort.join
digest = OpenSSL::Digest.new('sha1')
Base64.encode64(OpenSSL::HMAC.digest(digest, @auth_token, data)).strip
end
private
# Compares two strings in constant time to avoid timing attacks.
# Borrowed from ActiveSupport::MessageVerifier.
# https://github.com/rails/rails/blob/master/activesupport/lib/active_support/message_verifier.rb
def secure_compare(a, b)
return false unless a.bytesize == b.bytesize
l = a.unpack("C#{a.bytesize}")
res = 0
b.each_byte { |byte| res |= byte ^ l.shift }
res.zero?
end
# `ActionController::Parameters` no longer, as of Rails 5, inherits
# from `Hash` so the `sort` method, used above in `build_signature_for`
# is deprecated.
#
# `to_unsafe_h` was introduced in Rails 4.2.1, before then it is still
# possible to sort on an ActionController::Parameters object.
#
# We use `to_unsafe_h` as `to_h` returns a hash of the permitted
# parameters only and we need all the parameters to create the signature.
def params_to_hash(params)
if params.respond_to?(:to_unsafe_h)
params.to_unsafe_h
else
params
end
end
end
end
end
Version data entries
27 entries across 27 versions & 1 rubygems