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