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Fix compacted JSON-LD possibly causing compatibility issues on forwarding (#17428)

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Claire 2022-02-03 14:09:04 +01:00 • committed by GitHub
commit c8b1e72a4f
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3 changed files with 170 additions and 2 deletions
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18
app/services/activitypub/process_collection_service.rb
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@ -5,13 +5,27 @@ class ActivityPub::ProcessCollectionService < BaseService
def call(body, account, **options)
@account = account
@json = Oj.load(body, mode: :strict)
@json = original_json = Oj.load(body, mode: :strict)
@options = options
@json = compact(@json) if @json['signature'].is_a?(Hash)
begin
@json = compact(@json) if @json['signature'].is_a?(Hash)
rescue JSON::LD::JsonLdError => e
Rails.logger.debug "Error when compacting JSON-LD document for #{value_or_id(@json['actor'])}: #{e.message}"
@json = original_json.without('signature')
end
return if !supported_context? || (different_actor? && verify_account!.nil?) || suspended_actor? || @account.local?
if @json['signature'].present?
# We have verified the signature, but in the compaction step above, might
# have introduced incompatibilities with other servers that do not
# normalize the JSON-LD documents (for instance, previous Mastodon
# versions), so skip redistribution if we can't get a safe document.
patch_for_forwarding!(original_json, @json)
@json.delete('signature') unless safe_for_forwarding?(original_json, @json)
end
case @json['type']
when 'Collection', 'CollectionPage'
process_items @json['items']