mastodon/app/services/fetch_remote_account_service.rb

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# frozen_string_literal: true
class FetchRemoteAccountService < BaseService
def call(url)
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atom_url, body = FetchAtomService.new.call(url)
return nil if atom_url.nil?
process_atom(atom_url, body)
end
private
def process_atom(url, body)
xml = Nokogiri::XML(body)
xml.encoding = 'utf-8'
url_parts = Addressable::URI.parse(url)
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}"
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return FollowRemoteAccountService.new.call("#{username}@#{domain}")
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rescue TypeError
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Rails.logger.debug "Unparseable URL given: #{url}"
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nil
rescue Nokogiri::XML::XPath::SyntaxError
Rails.logger.debug 'Invalid XML or missing namespace'
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nil
end
end