@neo4j/graphql
Version:
A GraphQL to Cypher query execution layer for Neo4j and JavaScript GraphQL implementations
62 lines • 2.98 kB
JavaScript
;
/*
* Copyright (c) "Neo4j"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.subscriptionResolve = subscriptionResolve;
exports.generateSubscribeMethod = generateSubscribeMethod;
const events_1 = require("events");
const classes_1 = require("../../../classes");
const check_authentication_1 = require("./authentication/check-authentication");
const check_authentication_selection_set_1 = require("./authentication/check-authentication-selection-set");
const filter_async_iterator_1 = require("./filter-async-iterator");
const update_diff_filter_1 = require("./update-diff-filter");
const authorization_1 = require("./where/authorization");
const where_1 = require("./where/where");
function subscriptionResolve(payload) {
if (payload === undefined || payload[0] === undefined) {
throw new classes_1.Neo4jGraphQLError("Payload is undefined. Can't call subscriptions resolver directly.");
}
return payload[0];
}
function isNodeSubscriptionEvent(event) {
if (event === undefined) {
return false;
}
return "typename" in event;
}
function generateSubscribeMethod({ entityAdapter, type, }) {
return (_root, args, context, resolveInfo) => {
(0, check_authentication_selection_set_1.checkAuthenticationOnSelectionSet)(resolveInfo, entityAdapter, type, context);
(0, check_authentication_1.checkAuthentication)({ authenticated: entityAdapter, operation: "SUBSCRIBE", context });
const iterable = (0, events_1.on)(context.subscriptionsEngine.events, type);
if (["create", "update", "delete"].includes(type)) {
return (0, filter_async_iterator_1.filterAsyncIterator)(iterable, (data) => {
if (!isNodeSubscriptionEvent(data[0])) {
return false;
}
return (data[0].typename === entityAdapter.name &&
(0, authorization_1.subscriptionAuthorization)({ event: data[0], entity: entityAdapter, context }) &&
(0, where_1.subscriptionWhere)({ where: args.where, event: data[0], entityAdapter }) &&
(0, update_diff_filter_1.updateDiffFilter)(data[0]));
});
}
throw new classes_1.Neo4jGraphQLError(`Invalid type in subscription: ${type}`);
};
}
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