432 lines
14 KiB
Ruby
432 lines
14 KiB
Ruby
# frozen_string_literal: true
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require 'digest'
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class ActivityPub::ProcessAccountService < BaseService
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include JsonLdHelper
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include DomainControlHelper
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include Redisable
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include Lockable
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SUBDOMAINS_RATELIMIT = 10
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DISCOVERIES_PER_REQUEST = 400
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# Should be called with confirmed valid JSON
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# and WebFinger-resolved username and domain
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def call(username, domain, json, options = {})
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return if json['inbox'].blank? || unsupported_uri_scheme?(json['id']) || domain_not_allowed?(domain)
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@options = options
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@json = json
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@uri = @json['id']
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@username = username
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@domain = TagManager.instance.normalize_domain(domain)
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@collections = {}
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# The key does not need to be unguessable, it just needs to be somewhat unique
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@options[:request_id] ||= "#{Time.now.utc.to_i}-#{username}@#{domain}"
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with_redis_lock("process_account:#{@uri}") do
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@account = Account.remote.find_by(uri: @uri) if @options[:only_key]
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@account ||= Account.find_remote(@username, @domain)
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@old_public_key = @account&.public_key
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@old_protocol = @account&.protocol
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@suspension_changed = false
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if @account.nil?
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with_redis do |redis|
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return nil if redis.pfcount("unique_subdomains_for:#{PublicSuffix.domain(@domain, ignore_private: true)}") >= SUBDOMAINS_RATELIMIT
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discoveries = redis.incr("discovery_per_request:#{@options[:request_id]}")
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redis.expire("discovery_per_request:#{@options[:request_id]}", 5.minutes.seconds)
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return nil if discoveries > DISCOVERIES_PER_REQUEST
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end
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create_account
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end
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update_account
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process_tags
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process_duplicate_accounts! if @options[:verified_webfinger]
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end
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after_protocol_change! if protocol_changed?
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after_key_change! if key_changed? && !@options[:signed_with_known_key]
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clear_tombstones! if key_changed?
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after_suspension_change! if suspension_changed?
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unless @options[:only_key] || @account.suspended?
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check_featured_collection! if @account.featured_collection_url.present?
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check_featured_tags_collection! if @json['featuredTags'].present?
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check_links! if @account.fields.any?(&:requires_verification?)
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end
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@account
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rescue Oj::ParseError
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nil
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end
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private
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def create_account
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@account = Account.new
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@account.protocol = :activitypub
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@account.username = @username
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@account.domain = @domain
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@account.private_key = nil
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@account.suspended_at = domain_block.created_at if auto_suspend?
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@account.suspension_origin = :local if auto_suspend?
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@account.silenced_at = domain_block.created_at if auto_silence?
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set_immediate_protocol_attributes!
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@account.save!
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end
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def update_account
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@account.last_webfingered_at = Time.now.utc unless @options[:only_key]
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@account.protocol = :activitypub
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set_suspension!
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set_immediate_protocol_attributes!
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set_fetchable_key! unless @account.suspended? && @account.suspension_origin_local?
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set_immediate_attributes! unless @account.suspended?
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TreehouseAutomodExt.heuristic_auto_suspend!(@account)
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set_fetchable_attributes! unless @options[:only_key] || @account.suspended?
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@account.save_with_optional_media!
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end
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def set_immediate_protocol_attributes!
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@account.inbox_url = @json['inbox'] || ''
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@account.outbox_url = @json['outbox'] || ''
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@account.shared_inbox_url = (@json['endpoints'].is_a?(Hash) ? @json['endpoints']['sharedInbox'] : @json['sharedInbox']) || ''
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@account.followers_url = @json['followers'] || ''
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@account.url = url || @uri
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@account.uri = @uri
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@account.actor_type = actor_type
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@account.created_at = @json['published'] if @json['published'].present?
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end
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def set_immediate_attributes!
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@account.featured_collection_url = @json['featured'] || ''
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@account.devices_url = @json['devices'] || ''
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@account.display_name = @json['name'] || ''
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@account.note = @json['summary'] || ''
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@account.locked = @json['manuallyApprovesFollowers'] || false
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@account.fields = property_values || {}
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@account.also_known_as = as_array(@json['alsoKnownAs'] || []).map { |item| value_or_id(item) }
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@account.discoverable = @json['discoverable'] || false
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@account.indexable = @json['indexable'] || false
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@account.memorial = @json['memorial'] || false
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end
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def set_fetchable_key!
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@account.public_key = public_key || ''
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end
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def set_fetchable_attributes!
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begin
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@account.avatar_remote_url = image_url('icon') || '' unless skip_download?
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@account.avatar = nil if @account.avatar_remote_url.blank?
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rescue Mastodon::UnexpectedResponseError, HTTP::TimeoutError, HTTP::ConnectionError, OpenSSL::SSL::SSLError
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RedownloadAvatarWorker.perform_in(rand(30..600).seconds, @account.id)
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end
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begin
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@account.header_remote_url = image_url('image') || '' unless skip_download?
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@account.header = nil if @account.header_remote_url.blank?
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rescue Mastodon::UnexpectedResponseError, HTTP::TimeoutError, HTTP::ConnectionError, OpenSSL::SSL::SSLError
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RedownloadHeaderWorker.perform_in(rand(30..600).seconds, @account.id)
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end
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@account.statuses_count = outbox_total_items if outbox_total_items.present?
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@account.following_count = following_total_items if following_total_items.present?
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@account.followers_count = followers_total_items if followers_total_items.present?
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@account.hide_collections = following_private? || followers_private?
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@account.moved_to_account = @json['movedTo'].present? ? moved_account : nil
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end
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def set_suspension!
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return if @account.suspended? && @account.suspension_origin_local?
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if @account.suspended? && !@json['suspended']
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@account.unsuspend!
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@suspension_changed = true
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elsif !@account.suspended? && @json['suspended']
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@account.suspend!(origin: :remote)
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@suspension_changed = true
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end
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end
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def after_protocol_change!
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ActivityPub::PostUpgradeWorker.perform_async(@account.domain)
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end
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def after_key_change!
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RefollowWorker.perform_async(@account.id)
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end
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def after_suspension_change!
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if @account.suspended?
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Admin::SuspensionWorker.perform_async(@account.id)
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else
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Admin::UnsuspensionWorker.perform_async(@account.id)
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end
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end
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def check_featured_collection!
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ActivityPub::SynchronizeFeaturedCollectionWorker.perform_async(@account.id, { 'hashtag' => @json['featuredTags'].blank?, 'request_id' => @options[:request_id] })
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end
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def check_featured_tags_collection!
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ActivityPub::SynchronizeFeaturedTagsCollectionWorker.perform_async(@account.id, @json['featuredTags'])
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end
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def check_links!
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VerifyAccountLinksWorker.perform_async(@account.id)
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end
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def process_duplicate_accounts!
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return unless Account.where(uri: @account.uri).where.not(id: @account.id).exists?
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AccountMergingWorker.perform_async(@account.id)
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end
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def actor_type
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if @json['type'].is_a?(Array)
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@json['type'].find { |type| ActivityPub::FetchRemoteAccountService::SUPPORTED_TYPES.include?(type) }
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else
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@json['type']
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end
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end
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def image_url(key)
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value = first_of_value(@json[key])
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return if value.nil?
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return value['url'] if value.is_a?(Hash)
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image = fetch_resource_without_id_validation(value)
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image['url'] if image
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end
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def public_key
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value = first_of_value(@json['publicKey'])
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return if value.nil?
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return value['publicKeyPem'] if value.is_a?(Hash)
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key = fetch_resource_without_id_validation(value)
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key['publicKeyPem'] if key
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end
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def url
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return if @json['url'].blank?
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url_candidate = url_to_href(@json['url'], 'text/html')
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if unsupported_uri_scheme?(url_candidate) || mismatching_origin?(url_candidate)
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nil
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else
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url_candidate
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end
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end
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def property_values
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return unless @json['attachment'].is_a?(Array)
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as_array(@json['attachment']).select { |attachment| attachment['type'] == 'PropertyValue' }.map { |attachment| attachment.slice('name', 'value') }
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end
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def mismatching_origin?(url)
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needle = Addressable::URI.parse(url).host
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haystack = Addressable::URI.parse(@uri).host
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!haystack.casecmp(needle).zero?
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end
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def outbox_total_items
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collection_info('outbox').first
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end
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def following_total_items
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collection_info('following').first
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end
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def followers_total_items
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collection_info('followers').first
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end
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def following_private?
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!collection_info('following').last
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end
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def followers_private?
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!collection_info('followers').last
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end
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def collection_info(type)
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return [nil, nil] if @json[type].blank?
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return @collections[type] if @collections.key?(type)
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collection = fetch_resource_without_id_validation(@json[type])
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total_items = collection.is_a?(Hash) && collection['totalItems'].present? && collection['totalItems'].is_a?(Numeric) ? collection['totalItems'] : nil
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has_first_page = collection.is_a?(Hash) && collection['first'].present?
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@collections[type] = [total_items, has_first_page]
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rescue HTTP::Error, OpenSSL::SSL::SSLError, Mastodon::LengthValidationError
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@collections[type] = [nil, nil]
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end
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def moved_account
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account = ActivityPub::TagManager.instance.uri_to_resource(@json['movedTo'], Account)
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account ||= ActivityPub::FetchRemoteAccountService.new.call(@json['movedTo'], id: true, break_on_redirect: true, request_id: @options[:request_id])
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account
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end
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def skip_download?
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@account.suspended? || domain_block&.reject_media?
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end
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def auto_suspend?
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domain_block&.suspend?
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end
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def auto_silence?
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domain_block&.silence?
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end
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def domain_block
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return @domain_block if defined?(@domain_block)
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@domain_block = DomainBlock.rule_for(@domain)
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end
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def key_changed?
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!@old_public_key.nil? && @old_public_key != @account.public_key
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end
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def suspension_changed?
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@suspension_changed
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end
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def clear_tombstones!
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Tombstone.where(account_id: @account.id).delete_all
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end
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def protocol_changed?
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!@old_protocol.nil? && @old_protocol != @account.protocol
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end
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def process_tags
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return if @json['tag'].blank?
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as_array(@json['tag']).each do |tag|
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process_emoji tag if equals_or_includes?(tag['type'], 'Emoji')
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end
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end
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def process_emoji(tag)
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return if skip_download?
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return if tag['name'].blank? || tag['icon'].blank? || tag['icon']['url'].blank?
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shortcode = tag['name'].delete(':')
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image_url = tag['icon']['url']
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uri = tag['id']
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updated = tag['updated']
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emoji = CustomEmoji.find_by(shortcode: shortcode, domain: @account.domain)
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return unless emoji.nil? || image_url != emoji.image_remote_url || (updated && updated >= emoji.updated_at)
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emoji ||= CustomEmoji.new(domain: @account.domain, shortcode: shortcode, uri: uri)
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emoji.image_remote_url = image_url
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emoji.save
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end
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module TreehouseAutomodExt
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HEURISTIC_AUTO_SUSPEND_ACTIVE = ENV.fetch('TH_HEURISTIC_AUTO_SUSPEND', '') == 'that-one-spammer'
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AUTOMOD_ACCOUNT_USERNAME = ENV['TH_STAFF_ACCOUNT']
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# hardcoded for now
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# md5 because they don't deserve more mentions
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HEURISTIC_NAMES = {
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'0116a9deace3289b7092e945ef5ca0a5' => Set['57d3d0b932cc9cd01be6b2f4e82c1a4a']
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}
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# probably mathematically impossible to collide, but just in case...
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HEURISTIC_MAX_LEN = 16
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COMMENT_HEADER = <<~EOS
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Tracking Report - automatically created by TreehouseAutomodExt
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EOS
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WARNING_TEXT = <<~EOS
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Tracking Infraction - automatically created by TreehouseAutomodExt
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EOS
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EXPLANATION = <<~EOS
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This account was automatically suspended by TreehouseAutomodExt, an unsupported feature of Treehouse Social.
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Currently, the heuristic should only automatically suspend accounts with one specific username and display name.
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If this action is unexpected, please unset TH_HEURISTIC_AUTO_SUSPEND.
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EOS
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def self.heuristic_auto_suspend?(account)
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return false unless HEURISTIC_AUTO_SUSPEND_ACTIVE
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return unless account.username.length < HEURISTIC_MAX_LEN && account.display_name.length < HEURISTIC_MAX_LEN
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username_md5 = Digest::MD5.hexdigest(account.username)
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display_name_md5 = Digest::MD5.hexdigest(account.display_name)
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HEURISTIC_NAMES[username_md5].include?(display_name_md5)
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end
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def self.heuristic_auto_suspend!(account)
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return unless heuristic_auto_suspend?(account)
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file_tracking_report!(account) unless account.suspension_origin == :local
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account.suspended_at = Time.now.utc unless account.suspension_origin == :local
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account.suspension_origin = :local
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account.save!
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end
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def self.file_tracking_report!(account)
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reporter = staff_account
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return unless reporter
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report = ReportService.new.call(
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reporter,
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account,
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{
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comment: "#{COMMENT_HEADER}\n\n#{EXPLANATION}",
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th_skip_notify_staff: true,
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th_skip_forward: true,
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}
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)
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report.spam!
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report.assign_to_self!(reporter)
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account_action = Admin::AccountAction.new(
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type: 'suspend',
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report_id: report.id,
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target_account: account,
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current_account: reporter,
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send_email_notification: false,
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text: WARNING_TEXT,
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)
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account_action.save!
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report.resolve!(reporter)
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end
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def self.staff_account
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Account.find_local(AUTOMOD_ACCOUNT_USERNAME) if AUTOMOD_ACCOUNT_USERNAME
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end
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end
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end
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