84 lines
2.7 KiB
Ruby
84 lines
2.7 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
class ActivityPub::FetchRepliesService < BaseService
|
|
include JsonLdHelper
|
|
|
|
# Limit of fetched replies
|
|
MAX_REPLIES = 5
|
|
|
|
def call(reference_uri, collection_or_uri, max_pages: 1, allow_synchronous_requests: true, request_id: nil)
|
|
@reference_uri = reference_uri
|
|
@allow_synchronous_requests = allow_synchronous_requests
|
|
|
|
@items, n_pages = collection_items(collection_or_uri, max_pages: max_pages)
|
|
return if @items.nil?
|
|
|
|
@items = filter_replies(@items)
|
|
FetchReplyWorker.push_bulk(@items) { |reply_uri| [reply_uri, { 'request_id' => request_id }] }
|
|
|
|
[@items, n_pages]
|
|
end
|
|
|
|
private
|
|
|
|
def collection_items(collection_or_uri, max_pages: 1)
|
|
collection = fetch_collection(collection_or_uri)
|
|
return unless collection.is_a?(Hash)
|
|
|
|
collection = fetch_collection(collection['first']) if collection['first'].present?
|
|
return unless collection.is_a?(Hash)
|
|
|
|
items = []
|
|
n_pages = 1
|
|
while collection.is_a?(Hash)
|
|
items.concat(as_array(collection_page_items(collection)))
|
|
|
|
break if items.size >= MAX_REPLIES
|
|
break if n_pages >= max_pages
|
|
|
|
collection = collection['next'].present? ? fetch_collection(collection['next']) : nil
|
|
n_pages += 1
|
|
end
|
|
|
|
[items, n_pages]
|
|
end
|
|
|
|
def collection_page_items(collection)
|
|
case collection['type']
|
|
when 'Collection', 'CollectionPage'
|
|
collection['items']
|
|
when 'OrderedCollection', 'OrderedCollectionPage'
|
|
collection['orderedItems']
|
|
end
|
|
end
|
|
|
|
def fetch_collection(collection_or_uri)
|
|
return collection_or_uri if collection_or_uri.is_a?(Hash)
|
|
return unless @allow_synchronous_requests
|
|
return if non_matching_uri_hosts?(@reference_uri, collection_or_uri)
|
|
|
|
# NOTE: For backward compatibility reasons, Mastodon signs outgoing
|
|
# queries incorrectly by default.
|
|
#
|
|
# While this is relevant for all URLs with query strings, this is
|
|
# the only code path where this happens in practice.
|
|
#
|
|
# Therefore, retry with correct signatures if this fails.
|
|
begin
|
|
fetch_resource_without_id_validation(collection_or_uri, nil, raise_on_error: :temporary)
|
|
rescue Mastodon::UnexpectedResponseError => e
|
|
raise unless e.response && e.response.code == 401 && Addressable::URI.parse(collection_or_uri).query.present?
|
|
|
|
fetch_resource_without_id_validation(collection_or_uri, nil, raise_on_error: :temporary, request_options: { omit_query_string: false })
|
|
end
|
|
end
|
|
|
|
def filter_replies(items)
|
|
# Only fetch replies to the same server as the original status to avoid
|
|
# amplification attacks.
|
|
|
|
# Also limit to 5 fetched replies to limit potential for DoS.
|
|
items.map { |item| value_or_id(item) }.reject { |uri| non_matching_uri_hosts?(@reference_uri, uri) }.take(MAX_REPLIES)
|
|
end
|
|
end
|