class FollowRemoteAccountService < BaseService # Find or create a local account for a remote user. # When creating, look up the user's webfinger and fetch all # important information from their feed # @param [String] uri User URI in the form of username@domain # @param [Boolean] subscribe Whether to initiate a PubSubHubbub subscription # @return [Account] def call(uri, subscribe = true) username, domain = uri.split('@') return Account.find_local(username) if domain == Rails.configuration.x.local_domain account = Account.find_remote(username, domain) if account.nil? account = Account.new(username: username, domain: domain) elsif account.subscribed? return account end data = Goldfinger.finger("acct:#{uri}") account.remote_url = data.link('http://schemas.google.com/g/2010#updates-from').href account.salmon_url = data.link('salmon').href account.url = data.link('http://webfinger.net/rel/profile-page').href account.public_key = magic_key_to_pem(data.link('magic-public-key').href) account.private_key = nil feed = get_feed(account.remote_url) hubs = feed.xpath('//xmlns:link[@rel="hub"]') return nil if hubs.empty? || hubs.first.attribute('href').nil? || feed.at_xpath('/xmlns:feed/xmlns:author/xmlns:uri').nil? account.uri = feed.at_xpath('/xmlns:feed/xmlns:author/xmlns:uri').content account.hub_url = hubs.first.attribute('href').value get_profile(feed, account) account.save! if subscribe account.secret = SecureRandom.hex account.verify_token = SecureRandom.hex subscription = account.subscription(api_subscription_url(account.id)) subscription.subscribe account.save! end return account rescue Goldfinger::Error, HTTP::Error nil end private def get_feed(url) response = http_client.get(Addressable::URI.parse(url)) Nokogiri::XML(response) end def get_profile(xml, account) author = xml.at_xpath('/xmlns:feed/xmlns:author') update_remote_profile_service.(author, account) end def magic_key_to_pem(magic_key) _, modulus, exponent = magic_key.split('.') modulus, exponent = [modulus, exponent].map { |n| Base64.urlsafe_decode64(n).bytes.inject(0) { |num, byte| (num << 8) | byte } } key = OpenSSL::PKey::RSA.new key.n = modulus key.e = exponent key.to_pem end def update_remote_profile_service @update_remote_profile_service ||= UpdateRemoteProfileService.new end def http_client HTTP end end