class XrdController < ApplicationController before_action :set_format def host_meta @webfinger_template = "#{webfinger_url}?resource={uri}" end def webfinger @account = Account.find_local!(username_from_resource) @canonical_account_uri = "acct:#{@account.username}@#{Rails.configuration.x.local_domain}" @magic_key = pem_to_magic_key(@account.keypair.public_key) rescue ActiveRecord::RecordNotFound head 404 end private def set_format request.format = 'xml' response.headers['Content-Type'] = 'application/xrd+xml' end def username_from_resource if resource_param.start_with?('acct:') resource_param.split('@').first.gsub('acct:', '') else url = Addressable::URI.parse(resource_param) url.path.gsub('/users/', '') end end def pem_to_magic_key(public_key) modulus, exponent = [public_key.n, public_key.e].map do |component| result = '' until component.zero? result << [component % 256].pack('C') component >>= 8 end result.reverse! end (['RSA'] + [modulus, exponent].map { |n| Base64.urlsafe_encode64(n) }).join('.') end def resource_param params.require(:resource) end end