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60 lines
1.7 KiB
60 lines
1.7 KiB
# 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)
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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)
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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 invalid_origin?(collection_or_uri)
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collection = fetch_resource_without_id_validation(collection_or_uri)
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raise Mastodon::UnexpectedResponseError if collection.nil?
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collection
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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| invalid_origin?(uri) }.take(5)
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end
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def invalid_origin?(url)
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return true if unsupported_uri_scheme?(url)
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needle = Addressable::URI.parse(url).host
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haystack = Addressable::URI.parse(@account.uri).host
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!haystack.casecmp(needle).zero?
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end
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end
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