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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
# @return [Account]
def call(uri)
username, domain = uri.split('@')
return Account.find_local(username) if TagManager.instance.local_domain?(domain)
return nil if DomainBlock.blocked?(domain)
account = Account.find_remote(username, domain)
return account unless account.nil?
Rails.logger.debug "Creating new remote account for #{uri}"
account = Account.new(username: username, domain: domain)
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"]')
if hubs.empty? || hubs.first.attribute('href').nil?
raise Goldfinger::Error, 'No PubSubHubbub hubs found'
end
if feed.at_xpath('/xmlns:feed/xmlns:author/xmlns:uri').nil?
raise Goldfinger::Error, 'No author URI found'
end
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!
return account
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.call(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) { |a, e| (a << 8) | e } }
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.timeout(:per_operation, write: 20, connect: 20, read: 50)
end
end
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