hometown/app/services/fetch_remote_status_service.rb

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# frozen_string_literal: true
class FetchRemoteStatusService < BaseService
def call(url, prefetched_body = nil)
if prefetched_body.nil?
atom_url, body = FetchAtomService.new.call(url)
else
atom_url = url
body = prefetched_body
end
return nil if atom_url.nil?
process_atom(atom_url, body)
end
private
def process_atom(url, body)
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Rails.logger.debug "Processing Atom for remote status at #{url}"
xml = Nokogiri::XML(body)
xml.encoding = 'utf-8'
account = extract_author(url, xml)
return nil if account.nil?
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statuses = ProcessFeedService.new.call(body, account)
statuses.first
end
def extract_author(url, xml)
url_parts = Addressable::URI.parse(url).normalize
username = xml.at_xpath('//xmlns:author/xmlns:name').try(:content)
domain = url_parts.host
return nil if username.nil?
Rails.logger.debug "Going to webfinger #{username}@#{domain}"
account = FollowRemoteAccountService.new.call("#{username}@#{domain}")
# If the author's confirmed URLs do not match the domain of the URL
# we are reading this from, abort
return nil unless confirmed_domain?(domain, account)
account
rescue Nokogiri::XML::XPath::SyntaxError
Rails.logger.debug 'Invalid XML or missing namespace'
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nil
end
def confirmed_domain?(domain, account)
domain.casecmp(account.domain).zero? || domain.casecmp(Addressable::URI.parse(account.remote_url).normalize.host).zero?
end
end