You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
1.7 KiB
59 lines
1.7 KiB
# frozen_string_literal: true
|
|
|
|
class ActivityPub::FetchRepliesService < BaseService
|
|
include JsonLdHelper
|
|
|
|
def call(parent_status, collection_or_uri, allow_synchronous_requests = true)
|
|
@account = parent_status.account
|
|
@allow_synchronous_requests = allow_synchronous_requests
|
|
|
|
@items = collection_items(collection_or_uri)
|
|
return if @items.nil?
|
|
|
|
FetchReplyWorker.push_bulk(filtered_replies)
|
|
|
|
@items
|
|
end
|
|
|
|
private
|
|
|
|
def collection_items(collection_or_uri)
|
|
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)
|
|
|
|
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 invalid_origin?(collection_or_uri)
|
|
fetch_resource_without_id_validation(collection_or_uri, nil, true)
|
|
end
|
|
|
|
def filtered_replies
|
|
# 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| invalid_origin?(uri) }.take(5)
|
|
end
|
|
|
|
def invalid_origin?(url)
|
|
return true if unsupported_uri_scheme?(url)
|
|
|
|
needle = Addressable::URI.parse(url).host
|
|
haystack = Addressable::URI.parse(@account.uri).host
|
|
|
|
!haystack.casecmp(needle).zero?
|
|
end
|
|
end
|