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# frozen_string_literal: true
class FollowRemoteAccountService < BaseService
include OStatus2::MagicKey
include HttpHelper
DFRN_NS = 'http://purl.org/macgirvin/dfrn/1.0'
# 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
# @return [Account]
def call(uri, redirected = nil)
username, domain = uri.split('@')
return Account.find_local(username) if TagManager.instance.local_domain?(domain)
account = Account.find_remote(username, domain)
return account unless account_needs_webfinger_update?(account)
Rails.logger.debug "Looking up webfinger for #{uri}"
data = Goldfinger.finger("acct:#{uri}")
raise Goldfinger::Error, 'Missing resource links' if data.link('http://schemas.google.com/g/2010#updates-from').nil? || data.link('salmon').nil? || data.link('http://webfinger.net/rel/profile-page').nil? || data.link('magic-public-key').nil?
# Disallow account hijacking
confirmed_username, confirmed_domain = data.subject.gsub(/\Aacct:/, '').split('@')
unless confirmed_username.casecmp(username).zero? && confirmed_domain.casecmp(domain).zero?
return call("#{confirmed_username}@#{confirmed_domain}", true) if redirected.nil?
raise Goldfinger::Error, 'Requested and returned acct URI do not match'
end
return Account.find_local(confirmed_username) if TagManager.instance.local_domain?(confirmed_domain)
confirmed_account = Account.find_remote(confirmed_username, confirmed_domain)
if confirmed_account.nil?
Rails.logger.debug "Creating new remote account for #{uri}"
domain_block = DomainBlock.find_by(domain: domain)
account = Account.new(username: confirmed_username, domain: confirmed_domain)
account.suspended = true if domain_block && domain_block.suspend?
account.silenced = true if domain_block && domain_block.silence?
account.private_key = nil
else
account = confirmed_account
end
account.last_webfingered_at = Time.now.utc
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)
body, xml = get_feed(account.remote_url)
hubs = get_hubs(xml)
account.uri = get_account_uri(xml)
account.hub_url = hubs.first.attribute('href').value
account.save!
get_profile(body, account)
account
end
private
def account_needs_webfinger_update?(account)
account&.last_webfingered_at.nil? || account.last_webfingered_at <= 1.day.ago
end
def get_feed(url)
response = http_client(write: 20, connect: 20, read: 50).get(Addressable::URI.parse(url).normalize)
[response.to_s, Nokogiri::XML(response)]
end
def get_hubs(xml)
hubs = xml.xpath('//xmlns:link[@rel="hub"]')
raise Goldfinger::Error, 'No PubSubHubbub hubs found' if hubs.empty? || hubs.first.attribute('href').nil?
hubs
end
def get_account_uri(xml)
author_uri = xml.at_xpath('/xmlns:feed/xmlns:author/xmlns:uri')
if author_uri.nil?
owner = xml.at_xpath('/xmlns:feed').at_xpath('./dfrn:owner', dfrn: DFRN_NS)
author_uri = owner.at_xpath('./xmlns:uri') unless owner.nil?
end
raise Goldfinger::Error, 'Author URI could not be found' if author_uri.nil?
author_uri.content
end
def get_profile(body, account)
RemoteProfileUpdateWorker.perform_async(account.id, body.force_encoding('UTF-8'), false)
end
end
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