64 lines
2.2 KiB
Ruby
64 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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class ActivityPub::FetchRepliesService < BaseService
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include JsonLdHelper
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def call(parent_status, collection_or_uri, allow_synchronous_requests: true, request_id: nil)
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@account = parent_status.account
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@allow_synchronous_requests = allow_synchronous_requests
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@items = collection_items(collection_or_uri)
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return if @items.nil?
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FetchReplyWorker.push_bulk(filtered_replies) { |reply_uri| [reply_uri, { 'request_id' => request_id }] }
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@items
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end
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private
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def collection_items(collection_or_uri)
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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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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?(@account.uri, collection_or_uri)
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# NOTE: For backward compatibility reasons, Mastodon signs outgoing
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# queries incorrectly by default.
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#
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# While this is relevant for all URLs with query strings, this is
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# the only code path where this happens in practice.
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#
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# Therefore, retry with correct signatures if this fails.
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begin
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fetch_resource_without_id_validation(collection_or_uri, nil, true)
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rescue Mastodon::UnexpectedResponseError => e
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raise unless e.response && e.response.code == 401 && Addressable::URI.parse(collection_or_uri).query.present?
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fetch_resource_without_id_validation(collection_or_uri, nil, true, request_options: { with_query_string: true })
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end
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end
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def filtered_replies
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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?(@account.uri, uri) }.take(5)
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end
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end
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