4bec613897
This is a big one, so let me enumerate: Accounts as well as stream entry pages now contain Link headers that reference the Atom feed and Webfinger URL for the former and Atom entry for the latter. So you only need to HEAD those resources to get that information, no need to download and parse HTML <link>s. ProcessFeedService will now queue ThreadResolveWorker for each remote status that it cannot find otherwise. Furthermore, entries are now processed in reverse order (from bottom to top) in case a newer entry references a chronologically previous one. ThreadResolveWorker uses FetchRemoteStatusService to obtain a status and attach the child status it was queued for to it. FetchRemoteStatusService looks up the URL, first with a HEAD, tests if it's an Atom feed, in which case it processes it directly. Next for Link headers to the Atom feed, in which case that is fetched and processed. Lastly if it's HTML, it is checked for <link>s to the Atom feed, and if such is found, that is fetched and processed. The account for the status is derived from author/name attribute in the XML and the hostname in the URL (domain). FollowRemoteAccountService and ProcessFeedService are used. This means that potentially threads are resolved recursively until a dead-end is encountered, however it is performed asynchronously over background jobs, so it should be ok.
72 lines
1.9 KiB
Ruby
72 lines
1.9 KiB
Ruby
class FetchRemoteStatusService < BaseService
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def call(url)
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response = http_client.head(url)
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Rails.logger.debug "Remote status HEAD request returned code #{response.code}"
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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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return process_atom(url, fetch(url))
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elsif !response['Link'].blank?
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return process_headers(response)
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else
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return process_html(fetch(url))
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end
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end
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private
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def process_atom(url, body)
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Rails.logger.debug "Processing Atom for remote status"
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xml = Nokogiri::XML(body)
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account = extract_author(url, xml)
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return nil if account.nil?
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statuses = ProcessFeedService.new.(body, account)
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return statuses.first
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end
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def process_html(body)
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Rails.logger.debug "Processing HTML for remote status"
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page = Nokogiri::HTML(body)
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alternate_link = page.xpath('//link[@rel="alternate"]').find { |link| link['type'] == 'application/atom+xml' }
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return nil if alternate_link.nil?
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return process_atom(alternate_link['href'], fetch(alternate_link['href']))
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end
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def process_headers(response)
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Rails.logger.debug "Processing link header for remote status"
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link_header = LinkHeader.parse(response['Link'])
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alternate_link = link_header.find_link(['rel', 'alternate'], ['type', 'application/atom+xml'])
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return nil if alternate_link.nil?
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return process_atom(alternate_link.href, fetch(alternate_link.href))
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end
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def extract_author(url, xml)
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url_parts = Addressable::URI.parse(url)
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username = xml.at_xpath('//xmlns:author/xmlns:name').try(:content)
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domain = url_parts.host
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return nil if username.nil?
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Rails.logger.debug "Going to webfinger #{username}@#{domain}"
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return FollowRemoteAccountService.new.("#{username}@#{domain}")
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end
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def fetch(url)
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http_client.get(url).to_s
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end
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def http_client
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HTTP.timeout(:per_operation, write: 20, connect: 20, read: 50)
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end
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end
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