def authenticate_request(user_secret, time_skew=(15*60))
Mixlib::Authentication::Log.debug "Initializing header auth : #{request.inspect}"
@user_secret = user_secret
@allowed_time_skew = time_skew
begin
@auth_request
parse_signing_description
verify_signature
verify_timestamp
verify_content_hash
rescue StandardError=>se
raise AuthenticationError,"Failed to authenticate user request. Check your client key and clock: #{se.message}", se.backtrace
end
if valid_request?
SignatureResponse.new(user_id)
else
nil
end
end