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- # frozen_string_literal: true
-
- class ProcessFeedService < BaseService
- ACTIVITY_NS = 'http://activitystrea.ms/spec/1.0/'
- THREAD_NS = 'http://purl.org/syndication/thread/1.0'
-
- def call(body, account)
- xml = Nokogiri::XML(body)
- xml.encoding = 'utf-8'
-
- update_author(xml, account)
- process_entries(xml, account)
- end
-
- private
-
- def update_author(xml, account)
- return if xml.at_xpath('/xmlns:feed').nil?
- UpdateRemoteProfileService.new.call(xml.at_xpath('/xmlns:feed/xmlns:author'), account)
- end
-
- def process_entries(xml, account)
- xml.xpath('//xmlns:entry').reverse_each.map { |entry| ProcessEntry.new.call(entry, account) }.compact
- end
-
- class ProcessEntry
- def call(xml, account)
- @account = account
- @xml = xml
-
- return if skip_unsupported_type?
-
- case verb
- when :post, :share
- return create_status
- when :delete
- return delete_status
- end
- rescue ActiveRecord::RecordInvalid => e
- Rails.logger.debug "Nothing was saved for #{id} because: #{e}"
- nil
- end
-
- private
-
- def create_status
- Rails.logger.debug "Creating remote status #{id}"
- status = status_from_xml(@xml)
-
- if verb == :share
- original_status = status_from_xml(@xml.at_xpath('.//activity:object', activity: ACTIVITY_NS))
- status.reblog = original_status
-
- if original_status.nil?
- status.destroy
- return nil
- elsif original_status.reblog?
- status.reblog = original_status.reblog
- end
- end
-
- status.save!
-
- NotifyService.new.call(status.reblog.account, status) if status.reblog? && status.reblog.account.local?
- Rails.logger.debug "Queuing remote status #{status.id} (#{id}) for distribution"
- DistributionWorker.perform_async(status.id)
- status
- end
-
- def delete_status
- Rails.logger.debug "Deleting remote status #{id}"
- status = Status.find_by(uri: id)
- RemoveStatusService.new.call(status) unless status.nil?
- nil
- end
-
- def skip_unsupported_type?
- !([:post, :share, :delete].include?(verb) && [:activity, :note, :comment].include?(type))
- end
-
- def status_from_xml(entry)
- # Return early if status already exists in db
- status = find_status(id(entry))
- return status unless status.nil?
-
- # If status embeds an author, find that author
- # If that author cannot be found, don't record the status (do not misattribute)
- if account?(entry)
- begin
- account = find_or_resolve_account(acct(entry))
- return nil if account.nil?
- rescue Goldfinger::Error
- return nil
- end
- else
- account = @account
- end
-
- status = Status.create!(
- uri: id(entry),
- url: url(entry),
- account: account,
- text: content(entry),
- created_at: published(entry)
- )
-
- if thread?(entry)
- Rails.logger.debug "Trying to attach #{status.id} (#{id(entry)}) to #{thread(entry).first}"
- status.thread = find_or_resolve_status(status, *thread(entry))
- end
-
- mentions_from_xml(status, entry)
- hashtags_from_xml(status, entry)
- media_from_xml(status, entry)
-
- status
- end
-
- def find_or_resolve_account(acct)
- FollowRemoteAccountService.new.call(acct)
- end
-
- def find_or_resolve_status(parent, uri, url)
- status = find_status(uri)
- ThreadResolveWorker.perform_async(parent.id, url) if status.nil?
-
- status
- end
-
- def find_status(uri)
- if TagManager.instance.local_id?(uri)
- local_id = TagManager.instance.unique_tag_to_local_id(uri, 'Status')
- return Status.find(local_id)
- end
-
- Status.find_by(uri: uri)
- end
-
- def mentions_from_xml(parent, xml)
- processed_account_ids = []
-
- xml.xpath('./xmlns:link[@rel="mentioned"]').each do |link|
- next if link['href'] == 'http://activityschema.org/collection/public'
-
- url = Addressable::URI.parse(link['href'])
-
- mentioned_account = if TagManager.instance.local_domain?(url.host)
- Account.find_local(url.path.gsub('/users/', ''))
- else
- Account.find_by(url: link['href']) || FetchRemoteAccountService.new.call(link['href'])
- end
-
- next if mentioned_account.nil? || processed_account_ids.include?(mentioned_account.id)
-
- mention = mentioned_account.mentions.where(status: parent).first_or_create(status: parent)
-
- # Notify local user
- NotifyService.new.call(mentioned_account, mention) if mentioned_account.local?
-
- # So we can skip duplicate mentions
- processed_account_ids << mentioned_account.id
- end
- end
-
- def hashtags_from_xml(parent, xml)
- tags = xml.xpath('./xmlns:category').map { |category| category['term'] }.select { |t| !t.blank? }
- ProcessHashtagsService.new.call(parent, tags)
- end
-
- def media_from_xml(parent, xml)
- xml.xpath('./xmlns:link[@rel="enclosure"]').each do |link|
- next unless link['href']
-
- media = MediaAttachment.where(status: parent, remote_url: link['href']).first_or_initialize(account: parent.account, status: parent, remote_url: link['href'])
-
- begin
- media.file_remote_url = link['href']
- media.save
- rescue OpenURI::HTTPError, Paperclip::Errors::NotIdentifiedByImageMagickError
- next
- end
- end
- end
-
- def id(xml = @xml)
- xml.at_xpath('./xmlns:id').content
- end
-
- def verb(xml = @xml)
- raw = xml.at_xpath('./activity:verb', activity: ACTIVITY_NS).content
- raw.gsub('http://activitystrea.ms/schema/1.0/', '').gsub('http://ostatus.org/schema/1.0/', '').to_sym
- rescue
- :post
- end
-
- def type(xml = @xml)
- raw = xml.at_xpath('./activity:object-type', activity: ACTIVITY_NS).content
- raw.gsub('http://activitystrea.ms/schema/1.0/', '').gsub('http://ostatus.org/schema/1.0/', '').to_sym
- rescue
- :activity
- end
-
- def url(xml = @xml)
- link = xml.at_xpath('./xmlns:link[@rel="alternate"]')
- link.nil? ? nil : link['href']
- end
-
- def content(xml = @xml)
- xml.at_xpath('./xmlns:content').content
- end
-
- def published(xml = @xml)
- xml.at_xpath('./xmlns:published').content
- end
-
- def thread?(xml = @xml)
- !xml.at_xpath('./thr:in-reply-to', thr: THREAD_NS).nil?
- end
-
- def thread(xml = @xml)
- thr = xml.at_xpath('./thr:in-reply-to', thr: THREAD_NS)
- [thr['ref'], thr['href']]
- end
-
- def account?(xml = @xml)
- !xml.at_xpath('./xmlns:author').nil?
- end
-
- def acct(xml = @xml)
- username = xml.at_xpath('./xmlns:author/xmlns:name').content
- url = xml.at_xpath('./xmlns:author/xmlns:uri').content
- domain = Addressable::URI.parse(url).host
-
- "#{username}@#{domain}"
- end
- end
- end
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