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68 lines
2.5 KiB
68 lines
2.5 KiB
# frozen_string_literal: true
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class FetchResourceService < BaseService
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include JsonLdHelper
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ACCEPT_HEADER = 'application/activity+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams", text/html;q=0.1'
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def call(url)
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return if url.blank?
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process(url)
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rescue HTTP::Error, OpenSSL::SSL::SSLError, Addressable::URI::InvalidURIError, Mastodon::HostValidationError, Mastodon::LengthValidationError => e
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Rails.logger.debug "Error fetching resource #{@url}: #{e}"
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nil
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end
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private
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def process(url, terminal = false)
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@url = url
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perform_request { |response| process_response(response, terminal) }
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end
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def perform_request(&block)
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Request.new(:get, @url).add_headers('Accept' => ACCEPT_HEADER).on_behalf_of(Account.representative).perform(&block)
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end
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def process_response(response, terminal = false)
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return nil if response.code != 200
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if ['application/activity+json', 'application/ld+json'].include?(response.mime_type)
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body = response.body_with_limit
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json = body_to_json(body)
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[json['id'], { prefetched_body: body, id: true }] if supported_context?(json) && (equals_or_includes_any?(json['type'], ActivityPub::FetchRemoteAccountService::SUPPORTED_TYPES) || expected_type?(json))
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elsif !terminal
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link_header = response['Link'] && parse_link_header(response)
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if link_header&.find_link(%w(rel alternate))
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process_link_headers(link_header)
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elsif response.mime_type == 'text/html'
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process_html(response)
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end
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end
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end
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def expected_type?(json)
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equals_or_includes_any?(json['type'], ActivityPub::Activity::Create::SUPPORTED_TYPES + ActivityPub::Activity::Create::CONVERTED_TYPES)
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end
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def process_html(response)
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page = Nokogiri::HTML(response.body_with_limit)
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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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process(json_link['href'], terminal: true) unless json_link.nil?
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end
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def process_link_headers(link_header)
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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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process(json_link.href, terminal: true) unless json_link.nil?
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end
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def parse_link_header(response)
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LinkHeader.parse(response['Link'].is_a?(Array) ? response['Link'].first : response['Link'])
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end
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end
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