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  1. # frozen_string_literal: true
  2. class ProcessInteractionService < BaseService
  3. ACTIVITY_NS = 'http://activitystrea.ms/spec/1.0/'
  4. # Record locally the remote interaction with our user
  5. # @param [String] envelope Salmon envelope
  6. # @param [Account] target_account Account the Salmon was addressed to
  7. def call(envelope, target_account)
  8. body = salmon.unpack(envelope)
  9. xml = Nokogiri::XML(body)
  10. xml.encoding = 'utf-8'
  11. return unless contains_author?(xml)
  12. username = xml.at_xpath('/xmlns:entry/xmlns:author/xmlns:name').content
  13. url = xml.at_xpath('/xmlns:entry/xmlns:author/xmlns:uri').content
  14. domain = Addressable::URI.parse(url).host
  15. account = Account.find_by(username: username, domain: domain)
  16. return if DomainBlock.blocked?(domain)
  17. if account.nil?
  18. account = follow_remote_account_service.call("#{username}@#{domain}")
  19. end
  20. if salmon.verify(envelope, account.keypair)
  21. update_remote_profile_service.call(xml.at_xpath('/xmlns:entry/xmlns:author'), account)
  22. case verb(xml)
  23. when :follow
  24. follow!(account, target_account)
  25. when :unfollow
  26. unfollow!(account, target_account)
  27. when :favorite
  28. favourite!(xml, account)
  29. when :post
  30. add_post!(body, account) if mentions_account?(xml, target_account)
  31. when :share
  32. add_post!(body, account) unless status(xml).nil?
  33. when :delete
  34. delete_post!(xml, account)
  35. end
  36. end
  37. rescue Goldfinger::Error, HTTP::Error, OStatus2::BadSalmonError
  38. nil
  39. end
  40. private
  41. def contains_author?(xml)
  42. !(xml.at_xpath('/xmlns:entry/xmlns:author/xmlns:name').nil? || xml.at_xpath('/xmlns:entry/xmlns:author/xmlns:uri').nil?)
  43. end
  44. def mentions_account?(xml, account)
  45. xml.xpath('/xmlns:entry/xmlns:link[@rel="mentioned"]').each { |mention_link| return true if mention_link.attribute('href').value == TagManager.instance.url_for(account) }
  46. false
  47. end
  48. def verb(xml)
  49. 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
  50. rescue
  51. :post
  52. end
  53. def follow!(account, target_account)
  54. account.follow!(target_account)
  55. NotificationMailer.follow(target_account, account).deliver_later unless target_account.blocking?(account)
  56. end
  57. def unfollow!(account, target_account)
  58. account.unfollow!(target_account)
  59. end
  60. def delete_post!(xml, account)
  61. status = Status.find(activity_id(xml))
  62. return if status.nil?
  63. remove_status_service.call(status) if account.id == status.account_id
  64. end
  65. def favourite!(xml, from_account)
  66. current_status = status(xml)
  67. current_status.favourites.where(account: from_account).first_or_create!(account: from_account)
  68. NotificationMailer.favourite(current_status, from_account).deliver_later unless current_status.account.blocking?(from_account)
  69. end
  70. def add_post!(body, account)
  71. process_feed_service.call(body, account)
  72. end
  73. def status(xml)
  74. Status.find(TagManager.instance.unique_tag_to_local_id(activity_id(xml), 'Status'))
  75. end
  76. def activity_id(xml)
  77. xml.at_xpath('//activity:object', activity: ACTIVITY_NS).at_xpath('./xmlns:id').content
  78. end
  79. def salmon
  80. @salmon ||= OStatus2::Salmon.new
  81. end
  82. def follow_remote_account_service
  83. @follow_remote_account_service ||= FollowRemoteAccountService.new
  84. end
  85. def process_feed_service
  86. @process_feed_service ||= ProcessFeedService.new
  87. end
  88. def update_remote_profile_service
  89. @update_remote_profile_service ||= UpdateRemoteProfileService.new
  90. end
  91. def remove_status_service
  92. @remove_status_service ||= RemoveStatusService.new
  93. end
  94. end