- # frozen_string_literal: true
-
- class FetchAtomService < BaseService
- def call(url)
- return if url.blank?
-
- @url = url
-
- perform_request
- process_response
- rescue OpenSSL::SSL::SSLError => e
- Rails.logger.debug "SSL error: #{e}"
- nil
- rescue HTTP::ConnectionError => e
- Rails.logger.debug "HTTP ConnectionError: #{e}"
- nil
- end
-
- private
-
- def perform_request
- @response = Request.new(:get, @url)
- .add_headers('Accept' => 'application/activity+json, application/ld+json, application/atom+xml, text/html')
- .perform
- end
-
- def process_response(terminal = false)
- return nil if @response.code != 200
-
- if @response.mime_type == 'application/atom+xml'
- [@url, @response.to_s, :ostatus]
- elsif ['application/activity+json', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'].include?(@response.mime_type)
- [@url, @response.to_s, :activitypub]
- elsif @response['Link'] && !terminal
- process_headers
- elsif @response.mime_type == 'text/html' && !terminal
- process_html
- end
- end
-
- def process_html
- page = Nokogiri::HTML(@response.to_s)
-
- json_link = page.xpath('//link[@rel="alternate"]').find { |link| ['application/activity+json', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'].include?(link['type']) }
- atom_link = page.xpath('//link[@rel="alternate"]').find { |link| link['type'] == 'application/atom+xml' }
-
- if !json_link.nil?
- @url = json_link['href']
- perform_request
- process_response(true)
- elsif !atom_link.nil?
- @url = atom_link['href']
- perform_request
- process_response(true)
- end
- end
-
- def process_headers
- link_header = LinkHeader.parse(@response['Link'].is_a?(Array) ? @response['Link'].first : @response['Link'])
-
- json_link = link_header.find_link(%w(rel alternate), %w(type application/activity+json)) || link_header.find_link(%w(rel alternate), ['type', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'])
- atom_link = link_header.find_link(%w(rel alternate), %w(type application/atom+xml))
-
- if !json_link.nil?
- @url = json_link.href
- perform_request
- process_response(true)
- elsif !atom_link.nil?
- @url = atom_link.href
- perform_request
- process_response(true)
- end
- end
- end
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