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@@ -0,0 +1,78 @@
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+# frozen_string_literal: true
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+
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+class ActivityPub::FetchFeaturedTagsCollectionService < BaseService
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+ include JsonLdHelper
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+
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+ def call(account, url)
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+ return if url.blank? || account.suspended? || account.local?
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+
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+ @account = account
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+ @json = fetch_resource(url, true, local_follower)
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+
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+ return unless supported_context?(@json)
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+
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+ process_items(collection_items(@json))
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+ end
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+
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+ private
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+
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+ def collection_items(collection)
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+ all_items = []
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+
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+ collection = fetch_collection(collection['first']) if collection['first'].present?
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+
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+ while collection.is_a?(Hash)
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+ items = begin
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+ case collection['type']
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+ when 'Collection', 'CollectionPage'
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+ collection['items']
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+ when 'OrderedCollection', 'OrderedCollectionPage'
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+ collection['orderedItems']
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+ end
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+ end
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+
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+ break if items.blank?
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+
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+ all_items.concat(items)
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+
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+ break if all_items.size >= FeaturedTag::LIMIT
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+
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+ collection = collection['next'].present? ? fetch_collection(collection['next']) : nil
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+ end
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+
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+ all_items
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+ end
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+
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+ def fetch_collection(collection_or_uri)
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+ return collection_or_uri if collection_or_uri.is_a?(Hash)
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+ return if invalid_origin?(collection_or_uri)
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+
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+ fetch_resource_without_id_validation(collection_or_uri, local_follower, true)
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+ end
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+
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+ def process_items(items)
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+ names = items.filter_map { |item| item['type'] == 'Hashtag' && item['name']&.delete_prefix('#') }.map { |name| HashtagNormalizer.new.normalize(name) }
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+ to_remove = []
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+ to_add = names
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+
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+ FeaturedTag.where(account: @account).map(&:name).each do |name|
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+ if names.include?(name)
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+ to_add.delete(name)
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+ else
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+ to_remove << name
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+ end
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+ end
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+
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+ FeaturedTag.includes(:tag).where(account: @account, tags: { name: to_remove }).delete_all unless to_remove.empty?
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+
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+ to_add.each do |name|
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+ FeaturedTag.create!(account: @account, name: name)
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+ end
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+ end
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+
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+ def local_follower
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+ return @local_follower if defined?(@local_follower)
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+
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+ @local_follower = @account.followers.local.without_suspended.first
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+ end
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+end
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