masto-fe/app/services/activitypub/fetch_remote_key_service.rb
Eugen Rochko 72bb3e03fd Support more variations of ActivityPub keyId in signature (#4630)
- Tries to avoid performing HTTP request if the keyId is an actor URI
- Likewise if the URI is a fragment URI on top of actor URI
- Resolves public key, returns owner if the owner links back to the key
2017-08-21 22:57:34 +02:00

47 lines
1.1 KiB
Ruby

# frozen_string_literal: true
class ActivityPub::FetchRemoteKeyService < BaseService
include JsonLdHelper
# Returns account that owns the key
def call(uri, prefetched_json = nil)
@json = body_to_json(prefetched_json) || fetch_resource(uri)
return unless supported_context?(@json) && expected_type?
return find_account(uri, @json) if person?
@owner = fetch_resource(owner_uri)
return unless supported_context?(@owner) && confirmed_owner?
find_account(owner_uri, @owner)
end
private
def find_account(uri, prefetched_json)
account = ActivityPub::TagManager.instance.uri_to_resource(uri, Account)
account ||= ActivityPub::FetchRemoteAccountService.new.call(uri, prefetched_json)
account
end
def expected_type?
person? || public_key?
end
def person?
@json['type'] == 'Person'
end
def public_key?
@json['publicKeyPem'].present? && @json['owner'].present?
end
def owner_uri
@owner_uri ||= value_or_id(@json['owner'])
end
def confirmed_owner?
@owner['type'] == 'Person' && value_or_id(@owner['publicKey']) == @json['id']
end
end