using faraday magic for webfinger parsing. modified code from sporkmonger webfinger repo

webfinger.rb

#tons take from sporkmonger's webfinger github
require File.join(Rails.root, 'lib/webfinger/hcard')
require File.join(Rails.root, 'lib/webfinger/webfinger_profile')
require 'addressable/uri'
require 'addressable/template'
require 'xrd'

class Webfinger
  def self.lookup(email)
    setup_faraday
    email = self.normalize_acct_uri(email)
    hostname = email.path.split('@')[-1]
    hostmeta_xrd = self.fetch_hostmeta(hostname)
    template = self.lrdd_template(hostmeta_xrd)
    webfinger_uri = template.expand('uri' => email)
    return XRD.parse(Faraday.get(webfinger_uri).body)
  end

  def self.fetch_hostmeta(hostname)
      hostmeta_uri = Addressable::Template.new(
        'https://{hostname}/.well-known/host-meta'
      ).expand('hostname' => hostname)
      begin
        xrd = XRD.parse(Faraday.get(hostmeta_uri).body)
      rescue OpenSSL::SSL::SSLError => e
        # Needs to handle 404 case
        warn(e)
        if hostmeta_uri.scheme == 'https'
          hostmeta_uri.scheme = 'http'
          retry
        else
          raise e
        end
      end
  end


  def self.setup_faraday
    Faraday.default_connection = Faraday::Connection.new '', :ssl => {:ca_path =>'/System/Library/OpenSSL/certs'} do |builder|
      if RUBY_VERSION.include?('1.9.2') && EM.reactor_running?
        puts "using async hottness"
        builder.use Faraday::Adapter::EMSynchrony# make http requests with Net::HTTP
      else
        puts "using good ole nethttp"
        builder.use Faraday::Adapter::NetHttp     # make http requests with Net::HTTP
      end
    end
  end
  
  def self.normalize_acct_uri(acct_uri)
    acct_uri = Addressable::URI.parse(acct_uri).omit(:query, :fragment)
    acct_uri.scheme = 'acct'
    return acct_uri.normalize
  end

  def self.lrdd_template(xrd)
    return Addressable::Template.new(xrd.links(:rel => 'lrdd')[0].template)
  end
end