251 lines
7.9 KiB
Ruby
251 lines
7.9 KiB
Ruby
class ProcessFeedService < BaseService
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ACTIVITY_NS = 'http://activitystrea.ms/spec/1.0/'.freeze
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THREAD_NS = 'http://purl.org/syndication/thread/1.0'.freeze
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# Create local statuses from an Atom feed
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# @param [String] body Atom feed
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# @param [Account] account Account this feed belongs to
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# @return [Enumerable] created statuses
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def call(body, account)
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xml = Nokogiri::XML(body)
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update_remote_profile_service.call(xml.at_xpath('/xmlns:feed/xmlns:author'), account) unless xml.at_xpath('/xmlns:feed').nil?
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xml.xpath('//xmlns:entry').reverse_each.map { |entry| process_entry(account, entry) }.compact
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end
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private
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def process_entry(account, entry)
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return unless [:note, :comment, :activity].include? object_type(entry)
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status = Status.find_by(uri: activity_id(entry))
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# If we already have a post and the verb is now "delete", we gotta delete it and move on!
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if !status.nil? && verb(entry) == :delete
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delete_post!(status)
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return
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end
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return unless status.nil?
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status = Status.new(uri: activity_id(entry), url: activity_link(entry), account: account, text: content(entry), created_at: published(entry), updated_at: updated(entry))
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if verb(entry) == :share
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add_reblog!(entry, status)
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elsif verb(entry) == :post
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if thread_id(entry).nil?
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add_post!(entry, status)
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else
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add_reply!(entry, status)
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end
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else
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return
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end
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# If we added a status, go through accounts it mentions and create respective relations
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# Also record all media attachments for the status and for the reblogged status if present
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unless status.new_record?
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record_remote_mentions(status, entry.xpath('./xmlns:link[@rel="mentioned"]'))
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record_remote_mentions(status.reblog, entry.at_xpath('./activity:object', activity: ACTIVITY_NS).xpath('./xmlns:link[@rel="mentioned"]')) if status.reblog?
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process_attachments(entry, status)
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process_attachments(entry.xpath('./activity:object', activity: ACTIVITY_NS), status.reblog) if status.reblog?
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DistributionWorker.perform_async(status.id)
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return status
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end
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end
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def record_remote_mentions(status, links)
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return if status.local?
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# Here we have to do a reverse lookup of local accounts by their URL!
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# It's not pretty at all! I really wish all these protocols sticked to
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# using acct:username@domain only! It would make things so much easier
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# and tidier
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links.each do |mention_link|
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href_val = mention_link.attribute('href').value
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next if href_val == 'http://activityschema.org/collection/public'
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href = Addressable::URI.parse(href_val)
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if TagManager.instance.local_domain?(href.host)
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# A local user is mentioned
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mentioned_account = Account.find_local(href.path.gsub('/users/', ''))
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unless mentioned_account.nil?
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mentioned_account.mentions.where(status: status).first_or_create(status: status)
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NotificationMailer.mention(mentioned_account, status).deliver_later unless mentioned_account.blocking?(status.account)
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end
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else
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# What to do about remote user?
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# This is kinda dodgy because URLs could change, we don't index them
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mentioned_account = Account.find_by(url: href.to_s)
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if mentioned_account.nil?
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mentioned_account = FetchRemoteAccountService.new.call(href)
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end
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unless mentioned_account.nil?
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mentioned_account.mentions.where(status: status).first_or_create(status: status)
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end
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end
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end
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end
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def process_attachments(entry, status)
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return if status.local?
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entry.xpath('./xmlns:link[@rel="enclosure"]').each do |enclosure_link|
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next if enclosure_link.attribute('href').nil?
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media = MediaAttachment.where(status: status, remote_url: enclosure_link.attribute('href').value).first
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next unless media.nil?
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begin
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media = MediaAttachment.new(account: status.account, status: status, remote_url: enclosure_link.attribute('href').value)
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media.file_remote_url = enclosure_link.attribute('href').value
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media.save
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rescue Paperclip::Errors::NotIdentifiedByImageMagickError
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Rails.logger.debug "Error saving attachment from #{enclosure_link.attribute('href').value}"
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next
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end
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end
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end
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def add_post!(_entry, status)
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status.save!
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end
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def add_reblog!(entry, status)
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status.reblog = find_original_status(entry, target_id(entry))
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if status.reblog.nil?
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status.reblog = fetch_remote_status(entry)
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end
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if !status.reblog.nil?
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status.save!
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NotificationMailer.reblog(status.reblog, status.account).deliver_later if status.reblog.local? && !status.reblog.account.blocking?(status.account)
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end
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end
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def add_reply!(entry, status)
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status.thread = find_original_status(entry, thread_id(entry))
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status.save!
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if status.thread.nil? && !thread_href(entry).nil?
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ThreadResolveWorker.perform_async(status.id, thread_href(entry))
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end
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end
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def delete_post!(status)
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remove_status_service.call(status)
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end
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def find_original_status(_xml, id)
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return nil if id.nil?
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if TagManager.instance.local_id?(id)
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Status.find(TagManager.instance.unique_tag_to_local_id(id, 'Status'))
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else
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Status.find_by(uri: id)
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end
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end
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def fetch_remote_status(xml)
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username = xml.at_xpath('./activity:object', activity: ACTIVITY_NS).at_xpath('./xmlns:author/xmlns:name').content
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url = xml.at_xpath('./activity:object', activity: ACTIVITY_NS).at_xpath('./xmlns:author/xmlns:uri').content
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domain = Addressable::URI.parse(url).host
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account = Account.find_remote(username, domain)
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if account.nil?
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account = follow_remote_account_service.call("#{username}@#{domain}")
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end
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status = Status.new(account: account, uri: target_id(xml), text: target_content(xml), url: target_url(xml), created_at: published(xml), updated_at: updated(xml))
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status.thread = find_original_status(xml, thread_id(xml))
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if status.save && status.thread.nil? && !thread_href(xml).nil?
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ThreadResolveWorker.perform_async(status.id, thread_href(xml))
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end
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status
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rescue Goldfinger::Error, HTTP::Error
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nil
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end
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def published(xml)
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xml.at_xpath('./xmlns:published').content
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end
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def updated(xml)
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xml.at_xpath('./xmlns:updated').content
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end
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def content(xml)
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xml.at_xpath('./xmlns:content').try(:content)
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end
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def thread_id(xml)
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xml.at_xpath('./thr:in-reply-to', thr: THREAD_NS).attribute('ref').value
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rescue
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nil
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end
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def thread_href(xml)
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xml.at_xpath('./thr:in-reply-to', thr: THREAD_NS).attribute('href').value
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rescue
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nil
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end
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def target_id(xml)
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xml.at_xpath('.//activity:object', activity: ACTIVITY_NS).at_xpath('./xmlns:id').content
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rescue
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nil
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end
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def activity_id(xml)
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xml.at_xpath('./xmlns:id').content
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end
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def activity_link(xml)
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xml.at_xpath('./xmlns:link[@rel="alternate"]').attribute('href').value
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rescue
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''
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end
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def target_content(xml)
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xml.at_xpath('.//activity:object', activity: ACTIVITY_NS).at_xpath('./xmlns:content').content
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end
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def target_url(xml)
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xml.at_xpath('.//activity:object', activity: ACTIVITY_NS).at_xpath('./xmlns:link[@rel="alternate"]').attribute('href').value
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end
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def object_type(xml)
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xml.at_xpath('./activity:object-type', activity: ACTIVITY_NS).content.gsub('http://activitystrea.ms/schema/1.0/', '').gsub('http://ostatus.org/schema/1.0/', '').to_sym
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rescue
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:activity
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end
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def verb(xml)
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xml.at_xpath('./activity:verb', activity: ACTIVITY_NS).content.gsub('http://activitystrea.ms/schema/1.0/', '').gsub('http://ostatus.org/schema/1.0/', '').to_sym
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rescue
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:post
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end
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def follow_remote_account_service
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@follow_remote_account_service ||= FollowRemoteAccountService.new
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end
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def update_remote_profile_service
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@update_remote_profile_service ||= UpdateRemoteProfileService.new
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end
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def remove_status_service
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@remove_status_service ||= RemoveStatusService.new
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end
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end
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