71 lines
2.1 KiB
Ruby
71 lines
2.1 KiB
Ruby
# frozen_string_literal: true
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class ActivityPub::FetchRepliesService < BaseService
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include JsonLdHelper
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# Limit of fetched replies
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MAX_REPLIES = 5
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def call(reference_uri, collection_or_uri, max_pages: 1, allow_synchronous_requests: true, request_id: nil)
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@reference_uri = reference_uri
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@allow_synchronous_requests = allow_synchronous_requests
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@items, n_pages = collection_items(collection_or_uri, max_pages: max_pages)
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return if @items.nil?
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@items = filter_replies(@items)
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FetchReplyWorker.push_bulk(@items) { |reply_uri| [reply_uri, { 'request_id' => request_id }] }
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[@items, n_pages]
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end
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private
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def collection_items(collection_or_uri, max_pages: 1)
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collection = fetch_collection(collection_or_uri)
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return unless collection.is_a?(Hash)
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collection = fetch_collection(collection['first']) if collection['first'].present?
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return unless collection.is_a?(Hash)
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items = []
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n_pages = 1
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while collection.is_a?(Hash)
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items.concat(as_array(collection_page_items(collection)))
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break if items.size >= MAX_REPLIES
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break if n_pages >= max_pages
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collection = collection['next'].present? ? fetch_collection(collection['next']) : nil
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n_pages += 1
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end
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[items, n_pages]
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end
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def collection_page_items(collection)
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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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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 unless @allow_synchronous_requests
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return if non_matching_uri_hosts?(@reference_uri, collection_or_uri)
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fetch_resource_without_id_validation(collection_or_uri, nil, raise_on_error: :temporary)
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end
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def filter_replies(items)
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# Only fetch replies to the same server as the original status to avoid
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# amplification attacks.
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# Also limit to 5 fetched replies to limit potential for DoS.
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items.map { |item| value_or_id(item) }.reject { |uri| non_matching_uri_hosts?(@reference_uri, uri) }.take(MAX_REPLIES)
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end
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end
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