785 lines
25 KiB
JavaScript
785 lines
25 KiB
JavaScript
import tv4 from 'tv4';
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import Parse from 'parse/node';
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import { Subscription } from './Subscription';
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import { Client } from './Client';
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import { ParseWebSocketServer } from './ParseWebSocketServer';
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import logger from '../logger';
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import RequestSchema from './RequestSchema';
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import { matchesQuery, queryHash } from './QueryTools';
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import { ParsePubSub } from './ParsePubSub';
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import SchemaController from '../Controllers/SchemaController';
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import _ from 'lodash';
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import uuid from 'uuid';
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import { runLiveQueryEventHandlers } from '../triggers';
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import { getAuthForSessionToken, Auth } from '../Auth';
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import { getCacheController } from '../Controllers';
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import LRU from 'lru-cache';
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import UserRouter from '../Routers/UsersRouter';
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class ParseLiveQueryServer {
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clients: Map;
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// className -> (queryHash -> subscription)
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subscriptions: Object;
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parseWebSocketServer: Object;
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keyPairs: any;
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// The subscriber we use to get object update from publisher
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subscriber: Object;
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constructor(server: any, config: any = {}) {
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this.server = server;
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this.clients = new Map();
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this.subscriptions = new Map();
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config.appId = config.appId || Parse.applicationId;
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config.masterKey = config.masterKey || Parse.masterKey;
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// Store keys, convert obj to map
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const keyPairs = config.keyPairs || {};
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this.keyPairs = new Map();
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for (const key of Object.keys(keyPairs)) {
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this.keyPairs.set(key, keyPairs[key]);
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}
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logger.verbose('Support key pairs', this.keyPairs);
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// Initialize Parse
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Parse.Object.disableSingleInstance();
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const serverURL = config.serverURL || Parse.serverURL;
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Parse.serverURL = serverURL;
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Parse.initialize(config.appId, Parse.javaScriptKey, config.masterKey);
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// The cache controller is a proper cache controller
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// with access to User and Roles
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this.cacheController = getCacheController(config);
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// This auth cache stores the promises for each auth resolution.
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// The main benefit is to be able to reuse the same user / session token resolution.
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this.authCache = new LRU({
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max: 500, // 500 concurrent
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maxAge: 60 * 60 * 1000, // 1h
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});
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// Initialize websocket server
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this.parseWebSocketServer = new ParseWebSocketServer(
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server,
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parseWebsocket => this._onConnect(parseWebsocket),
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config
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);
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// Initialize subscriber
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this.subscriber = ParsePubSub.createSubscriber(config);
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this.subscriber.subscribe(Parse.applicationId + 'afterSave');
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this.subscriber.subscribe(Parse.applicationId + 'afterDelete');
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// Register message handler for subscriber. When publisher get messages, it will publish message
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// to the subscribers and the handler will be called.
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this.subscriber.on('message', (channel, messageStr) => {
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logger.verbose('Subscribe messsage %j', messageStr);
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let message;
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try {
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message = JSON.parse(messageStr);
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} catch (e) {
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logger.error('unable to parse message', messageStr, e);
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return;
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}
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this._inflateParseObject(message);
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if (channel === Parse.applicationId + 'afterSave') {
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this._onAfterSave(message);
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} else if (channel === Parse.applicationId + 'afterDelete') {
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this._onAfterDelete(message);
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} else {
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logger.error(
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'Get message %s from unknown channel %j',
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message,
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channel
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);
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}
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});
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}
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// Message is the JSON object from publisher. Message.currentParseObject is the ParseObject JSON after changes.
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// Message.originalParseObject is the original ParseObject JSON.
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_inflateParseObject(message: any): void {
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// Inflate merged object
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const currentParseObject = message.currentParseObject;
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UserRouter.removeHiddenProperties(currentParseObject);
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let className = currentParseObject.className;
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let parseObject = new Parse.Object(className);
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parseObject._finishFetch(currentParseObject);
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message.currentParseObject = parseObject;
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// Inflate original object
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const originalParseObject = message.originalParseObject;
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if (originalParseObject) {
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UserRouter.removeHiddenProperties(originalParseObject);
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className = originalParseObject.className;
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parseObject = new Parse.Object(className);
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parseObject._finishFetch(originalParseObject);
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message.originalParseObject = parseObject;
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}
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}
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// Message is the JSON object from publisher after inflated. Message.currentParseObject is the ParseObject after changes.
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// Message.originalParseObject is the original ParseObject.
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_onAfterDelete(message: any): void {
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logger.verbose(Parse.applicationId + 'afterDelete is triggered');
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const deletedParseObject = message.currentParseObject.toJSON();
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const classLevelPermissions = message.classLevelPermissions;
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const className = deletedParseObject.className;
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logger.verbose(
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'ClassName: %j | ObjectId: %s',
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className,
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deletedParseObject.id
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);
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logger.verbose('Current client number : %d', this.clients.size);
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const classSubscriptions = this.subscriptions.get(className);
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if (typeof classSubscriptions === 'undefined') {
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logger.debug('Can not find subscriptions under this class ' + className);
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return;
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}
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for (const subscription of classSubscriptions.values()) {
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const isSubscriptionMatched = this._matchesSubscription(
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deletedParseObject,
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subscription
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);
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if (!isSubscriptionMatched) {
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continue;
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}
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for (const [clientId, requestIds] of _.entries(
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subscription.clientRequestIds
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)) {
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const client = this.clients.get(clientId);
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if (typeof client === 'undefined') {
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continue;
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}
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for (const requestId of requestIds) {
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const acl = message.currentParseObject.getACL();
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// Check CLP
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const op = this._getCLPOperation(subscription.query);
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this._matchesCLP(
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classLevelPermissions,
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message.currentParseObject,
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client,
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requestId,
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op
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)
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.then(() => {
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// Check ACL
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return this._matchesACL(acl, client, requestId);
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})
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.then(isMatched => {
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if (!isMatched) {
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return null;
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}
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client.pushDelete(requestId, deletedParseObject);
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})
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.catch(error => {
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logger.error('Matching ACL error : ', error);
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});
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}
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}
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}
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}
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// Message is the JSON object from publisher after inflated. Message.currentParseObject is the ParseObject after changes.
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// Message.originalParseObject is the original ParseObject.
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_onAfterSave(message: any): void {
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logger.verbose(Parse.applicationId + 'afterSave is triggered');
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let originalParseObject = null;
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if (message.originalParseObject) {
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originalParseObject = message.originalParseObject.toJSON();
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}
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const classLevelPermissions = message.classLevelPermissions;
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const currentParseObject = message.currentParseObject.toJSON();
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const className = currentParseObject.className;
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logger.verbose(
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'ClassName: %s | ObjectId: %s',
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className,
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currentParseObject.id
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);
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logger.verbose('Current client number : %d', this.clients.size);
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const classSubscriptions = this.subscriptions.get(className);
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if (typeof classSubscriptions === 'undefined') {
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logger.debug('Can not find subscriptions under this class ' + className);
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return;
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}
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for (const subscription of classSubscriptions.values()) {
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const isOriginalSubscriptionMatched = this._matchesSubscription(
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originalParseObject,
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subscription
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);
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const isCurrentSubscriptionMatched = this._matchesSubscription(
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currentParseObject,
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subscription
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);
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for (const [clientId, requestIds] of _.entries(
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subscription.clientRequestIds
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)) {
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const client = this.clients.get(clientId);
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if (typeof client === 'undefined') {
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continue;
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}
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for (const requestId of requestIds) {
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// Set orignal ParseObject ACL checking promise, if the object does not match
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// subscription, we do not need to check ACL
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let originalACLCheckingPromise;
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if (!isOriginalSubscriptionMatched) {
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originalACLCheckingPromise = Promise.resolve(false);
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} else {
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let originalACL;
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if (message.originalParseObject) {
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originalACL = message.originalParseObject.getACL();
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}
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originalACLCheckingPromise = this._matchesACL(
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originalACL,
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client,
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requestId
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);
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}
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// Set current ParseObject ACL checking promise, if the object does not match
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// subscription, we do not need to check ACL
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let currentACLCheckingPromise;
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if (!isCurrentSubscriptionMatched) {
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currentACLCheckingPromise = Promise.resolve(false);
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} else {
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const currentACL = message.currentParseObject.getACL();
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currentACLCheckingPromise = this._matchesACL(
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currentACL,
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client,
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requestId
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);
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}
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const op = this._getCLPOperation(subscription.query);
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this._matchesCLP(
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classLevelPermissions,
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message.currentParseObject,
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client,
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requestId,
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op
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)
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.then(() => {
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return Promise.all([
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originalACLCheckingPromise,
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currentACLCheckingPromise,
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]);
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})
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.then(
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([isOriginalMatched, isCurrentMatched]) => {
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logger.verbose(
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'Original %j | Current %j | Match: %s, %s, %s, %s | Query: %s',
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originalParseObject,
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currentParseObject,
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isOriginalSubscriptionMatched,
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isCurrentSubscriptionMatched,
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isOriginalMatched,
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isCurrentMatched,
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subscription.hash
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);
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// Decide event type
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let type;
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if (isOriginalMatched && isCurrentMatched) {
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type = 'Update';
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} else if (isOriginalMatched && !isCurrentMatched) {
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type = 'Leave';
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} else if (!isOriginalMatched && isCurrentMatched) {
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if (originalParseObject) {
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type = 'Enter';
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} else {
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type = 'Create';
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}
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} else {
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return null;
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}
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const functionName = 'push' + type;
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client[functionName](
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requestId,
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currentParseObject,
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originalParseObject
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);
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},
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error => {
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logger.error('Matching ACL error : ', error);
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}
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);
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}
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}
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}
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}
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_onConnect(parseWebsocket: any): void {
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parseWebsocket.on('message', request => {
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if (typeof request === 'string') {
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try {
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request = JSON.parse(request);
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} catch (e) {
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logger.error('unable to parse request', request, e);
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return;
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}
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}
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logger.verbose('Request: %j', request);
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// Check whether this request is a valid request, return error directly if not
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if (
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!tv4.validate(request, RequestSchema['general']) ||
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!tv4.validate(request, RequestSchema[request.op])
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) {
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Client.pushError(parseWebsocket, 1, tv4.error.message);
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logger.error('Connect message error %s', tv4.error.message);
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return;
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}
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switch (request.op) {
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case 'connect':
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this._handleConnect(parseWebsocket, request);
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break;
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case 'subscribe':
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this._handleSubscribe(parseWebsocket, request);
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break;
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case 'update':
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this._handleUpdateSubscription(parseWebsocket, request);
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break;
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case 'unsubscribe':
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this._handleUnsubscribe(parseWebsocket, request);
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break;
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default:
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Client.pushError(parseWebsocket, 3, 'Get unknown operation');
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logger.error('Get unknown operation', request.op);
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}
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});
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parseWebsocket.on('disconnect', () => {
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logger.info(`Client disconnect: ${parseWebsocket.clientId}`);
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const clientId = parseWebsocket.clientId;
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if (!this.clients.has(clientId)) {
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runLiveQueryEventHandlers({
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event: 'ws_disconnect_error',
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clients: this.clients.size,
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subscriptions: this.subscriptions.size,
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error: `Unable to find client ${clientId}`,
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});
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logger.error(`Can not find client ${clientId} on disconnect`);
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return;
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}
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// Delete client
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const client = this.clients.get(clientId);
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this.clients.delete(clientId);
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// Delete client from subscriptions
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for (const [requestId, subscriptionInfo] of _.entries(
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client.subscriptionInfos
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)) {
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const subscription = subscriptionInfo.subscription;
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subscription.deleteClientSubscription(clientId, requestId);
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// If there is no client which is subscribing this subscription, remove it from subscriptions
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const classSubscriptions = this.subscriptions.get(
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subscription.className
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);
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if (!subscription.hasSubscribingClient()) {
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classSubscriptions.delete(subscription.hash);
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}
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// If there is no subscriptions under this class, remove it from subscriptions
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if (classSubscriptions.size === 0) {
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this.subscriptions.delete(subscription.className);
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}
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}
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logger.verbose('Current clients %d', this.clients.size);
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logger.verbose('Current subscriptions %d', this.subscriptions.size);
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runLiveQueryEventHandlers({
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event: 'ws_disconnect',
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clients: this.clients.size,
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subscriptions: this.subscriptions.size,
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});
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});
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runLiveQueryEventHandlers({
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event: 'ws_connect',
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clients: this.clients.size,
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subscriptions: this.subscriptions.size,
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});
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}
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_matchesSubscription(parseObject: any, subscription: any): boolean {
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// Object is undefined or null, not match
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if (!parseObject) {
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return false;
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}
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return matchesQuery(parseObject, subscription.query);
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}
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getAuthForSessionToken(
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sessionToken: ?string
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): Promise<{ auth: ?Auth, userId: ?string }> {
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if (!sessionToken) {
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return Promise.resolve({});
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}
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const fromCache = this.authCache.get(sessionToken);
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if (fromCache) {
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return fromCache;
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}
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const authPromise = getAuthForSessionToken({
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cacheController: this.cacheController,
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sessionToken: sessionToken,
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})
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.then(auth => {
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return { auth, userId: auth && auth.user && auth.user.id };
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})
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.catch(error => {
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// There was an error with the session token
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const result = {};
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if (error && error.code === Parse.Error.INVALID_SESSION_TOKEN) {
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// Store a resolved promise with the error for 10 minutes
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result.error = error;
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this.authCache.set(
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sessionToken,
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Promise.resolve(result),
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60 * 10 * 1000
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);
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} else {
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this.authCache.del(sessionToken);
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}
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return result;
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});
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this.authCache.set(sessionToken, authPromise);
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return authPromise;
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}
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async _matchesCLP(
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classLevelPermissions: ?any,
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object: any,
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client: any,
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requestId: number,
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op: string
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): any {
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// try to match on user first, less expensive than with roles
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const subscriptionInfo = client.getSubscriptionInfo(requestId);
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const aclGroup = ['*'];
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let userId;
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if (typeof subscriptionInfo !== 'undefined') {
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const { userId } = await this.getAuthForSessionToken(
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subscriptionInfo.sessionToken
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);
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if (userId) {
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aclGroup.push(userId);
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}
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}
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try {
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await SchemaController.validatePermission(
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classLevelPermissions,
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object.className,
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aclGroup,
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op
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);
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return true;
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} catch (e) {
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logger.verbose(`Failed matching CLP for ${object.id} ${userId} ${e}`);
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return false;
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}
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// TODO: handle roles permissions
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// Object.keys(classLevelPermissions).forEach((key) => {
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// const perm = classLevelPermissions[key];
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// Object.keys(perm).forEach((key) => {
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// if (key.indexOf('role'))
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// });
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// })
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// // it's rejected here, check the roles
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// var rolesQuery = new Parse.Query(Parse.Role);
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// rolesQuery.equalTo("users", user);
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// return rolesQuery.find({useMasterKey:true});
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}
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_getCLPOperation(query: any) {
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return typeof query === 'object' &&
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Object.keys(query).length == 1 &&
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typeof query.objectId === 'string'
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? 'get'
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: 'find';
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}
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async _verifyACL(acl: any, token: string) {
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if (!token) {
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return false;
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}
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const { auth, userId } = await this.getAuthForSessionToken(token);
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// Getting the session token failed
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// This means that no additional auth is available
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// At this point, just bail out as no additional visibility can be inferred.
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if (!auth || !userId) {
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return false;
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}
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const isSubscriptionSessionTokenMatched = acl.getReadAccess(userId);
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if (isSubscriptionSessionTokenMatched) {
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return true;
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}
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// Check if the user has any roles that match the ACL
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return Promise.resolve()
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.then(async () => {
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// Resolve false right away if the acl doesn't have any roles
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const acl_has_roles = Object.keys(acl.permissionsById).some(key =>
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key.startsWith('role:')
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);
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if (!acl_has_roles) {
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return false;
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}
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const roleNames = await auth.getUserRoles();
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// Finally, see if any of the user's roles allow them read access
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for (const role of roleNames) {
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// We use getReadAccess as `role` is in the form `role:roleName`
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if (acl.getReadAccess(role)) {
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return true;
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}
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}
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return false;
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})
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.catch(() => {
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return false;
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});
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}
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async _matchesACL(
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acl: any,
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client: any,
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requestId: number
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): Promise<boolean> {
|
|
// Return true directly if ACL isn't present, ACL is public read, or client has master key
|
|
if (!acl || acl.getPublicReadAccess() || client.hasMasterKey) {
|
|
return true;
|
|
}
|
|
// Check subscription sessionToken matches ACL first
|
|
const subscriptionInfo = client.getSubscriptionInfo(requestId);
|
|
if (typeof subscriptionInfo === 'undefined') {
|
|
return false;
|
|
}
|
|
|
|
const subscriptionToken = subscriptionInfo.sessionToken;
|
|
const clientSessionToken = client.sessionToken;
|
|
|
|
if (await this._verifyACL(acl, subscriptionToken)) {
|
|
return true;
|
|
}
|
|
|
|
if (await this._verifyACL(acl, clientSessionToken)) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
_handleConnect(parseWebsocket: any, request: any): any {
|
|
if (!this._validateKeys(request, this.keyPairs)) {
|
|
Client.pushError(parseWebsocket, 4, 'Key in request is not valid');
|
|
logger.error('Key in request is not valid');
|
|
return;
|
|
}
|
|
const hasMasterKey = this._hasMasterKey(request, this.keyPairs);
|
|
const clientId = uuid();
|
|
const client = new Client(clientId, parseWebsocket, hasMasterKey);
|
|
parseWebsocket.clientId = clientId;
|
|
this.clients.set(parseWebsocket.clientId, client);
|
|
logger.info(`Create new client: ${parseWebsocket.clientId}`);
|
|
client.pushConnect();
|
|
runLiveQueryEventHandlers({
|
|
event: 'connect',
|
|
clients: this.clients.size,
|
|
subscriptions: this.subscriptions.size,
|
|
});
|
|
}
|
|
|
|
_hasMasterKey(request: any, validKeyPairs: any): boolean {
|
|
if (
|
|
!validKeyPairs ||
|
|
validKeyPairs.size == 0 ||
|
|
!validKeyPairs.has('masterKey')
|
|
) {
|
|
return false;
|
|
}
|
|
if (!request || !request.hasOwnProperty('masterKey')) {
|
|
return false;
|
|
}
|
|
return request.masterKey === validKeyPairs.get('masterKey');
|
|
}
|
|
|
|
_validateKeys(request: any, validKeyPairs: any): boolean {
|
|
if (!validKeyPairs || validKeyPairs.size == 0) {
|
|
return true;
|
|
}
|
|
let isValid = false;
|
|
for (const [key, secret] of validKeyPairs) {
|
|
if (!request[key] || request[key] !== secret) {
|
|
continue;
|
|
}
|
|
isValid = true;
|
|
break;
|
|
}
|
|
return isValid;
|
|
}
|
|
|
|
_handleSubscribe(parseWebsocket: any, request: any): any {
|
|
// If we can not find this client, return error to client
|
|
if (!parseWebsocket.hasOwnProperty('clientId')) {
|
|
Client.pushError(
|
|
parseWebsocket,
|
|
2,
|
|
'Can not find this client, make sure you connect to server before subscribing'
|
|
);
|
|
logger.error(
|
|
'Can not find this client, make sure you connect to server before subscribing'
|
|
);
|
|
return;
|
|
}
|
|
const client = this.clients.get(parseWebsocket.clientId);
|
|
|
|
// Get subscription from subscriptions, create one if necessary
|
|
const subscriptionHash = queryHash(request.query);
|
|
// Add className to subscriptions if necessary
|
|
const className = request.query.className;
|
|
if (!this.subscriptions.has(className)) {
|
|
this.subscriptions.set(className, new Map());
|
|
}
|
|
const classSubscriptions = this.subscriptions.get(className);
|
|
let subscription;
|
|
if (classSubscriptions.has(subscriptionHash)) {
|
|
subscription = classSubscriptions.get(subscriptionHash);
|
|
} else {
|
|
subscription = new Subscription(
|
|
className,
|
|
request.query.where,
|
|
subscriptionHash
|
|
);
|
|
classSubscriptions.set(subscriptionHash, subscription);
|
|
}
|
|
|
|
// Add subscriptionInfo to client
|
|
const subscriptionInfo = {
|
|
subscription: subscription,
|
|
};
|
|
// Add selected fields and sessionToken for this subscription if necessary
|
|
if (request.query.fields) {
|
|
subscriptionInfo.fields = request.query.fields;
|
|
}
|
|
if (request.sessionToken) {
|
|
subscriptionInfo.sessionToken = request.sessionToken;
|
|
}
|
|
client.addSubscriptionInfo(request.requestId, subscriptionInfo);
|
|
|
|
// Add clientId to subscription
|
|
subscription.addClientSubscription(
|
|
parseWebsocket.clientId,
|
|
request.requestId
|
|
);
|
|
|
|
client.pushSubscribe(request.requestId);
|
|
|
|
logger.verbose(
|
|
`Create client ${parseWebsocket.clientId} new subscription: ${
|
|
request.requestId
|
|
}`
|
|
);
|
|
logger.verbose('Current client number: %d', this.clients.size);
|
|
runLiveQueryEventHandlers({
|
|
event: 'subscribe',
|
|
clients: this.clients.size,
|
|
subscriptions: this.subscriptions.size,
|
|
});
|
|
}
|
|
|
|
_handleUpdateSubscription(parseWebsocket: any, request: any): any {
|
|
this._handleUnsubscribe(parseWebsocket, request, false);
|
|
this._handleSubscribe(parseWebsocket, request);
|
|
}
|
|
|
|
_handleUnsubscribe(
|
|
parseWebsocket: any,
|
|
request: any,
|
|
notifyClient: boolean = true
|
|
): any {
|
|
// If we can not find this client, return error to client
|
|
if (!parseWebsocket.hasOwnProperty('clientId')) {
|
|
Client.pushError(
|
|
parseWebsocket,
|
|
2,
|
|
'Can not find this client, make sure you connect to server before unsubscribing'
|
|
);
|
|
logger.error(
|
|
'Can not find this client, make sure you connect to server before unsubscribing'
|
|
);
|
|
return;
|
|
}
|
|
const requestId = request.requestId;
|
|
const client = this.clients.get(parseWebsocket.clientId);
|
|
if (typeof client === 'undefined') {
|
|
Client.pushError(
|
|
parseWebsocket,
|
|
2,
|
|
'Cannot find client with clientId ' +
|
|
parseWebsocket.clientId +
|
|
'. Make sure you connect to live query server before unsubscribing.'
|
|
);
|
|
logger.error('Can not find this client ' + parseWebsocket.clientId);
|
|
return;
|
|
}
|
|
|
|
const subscriptionInfo = client.getSubscriptionInfo(requestId);
|
|
if (typeof subscriptionInfo === 'undefined') {
|
|
Client.pushError(
|
|
parseWebsocket,
|
|
2,
|
|
'Cannot find subscription with clientId ' +
|
|
parseWebsocket.clientId +
|
|
' subscriptionId ' +
|
|
requestId +
|
|
'. Make sure you subscribe to live query server before unsubscribing.'
|
|
);
|
|
logger.error(
|
|
'Can not find subscription with clientId ' +
|
|
parseWebsocket.clientId +
|
|
' subscriptionId ' +
|
|
requestId
|
|
);
|
|
return;
|
|
}
|
|
|
|
// Remove subscription from client
|
|
client.deleteSubscriptionInfo(requestId);
|
|
// Remove client from subscription
|
|
const subscription = subscriptionInfo.subscription;
|
|
const className = subscription.className;
|
|
subscription.deleteClientSubscription(parseWebsocket.clientId, requestId);
|
|
// If there is no client which is subscribing this subscription, remove it from subscriptions
|
|
const classSubscriptions = this.subscriptions.get(className);
|
|
if (!subscription.hasSubscribingClient()) {
|
|
classSubscriptions.delete(subscription.hash);
|
|
}
|
|
// If there is no subscriptions under this class, remove it from subscriptions
|
|
if (classSubscriptions.size === 0) {
|
|
this.subscriptions.delete(className);
|
|
}
|
|
runLiveQueryEventHandlers({
|
|
event: 'unsubscribe',
|
|
clients: this.clients.size,
|
|
subscriptions: this.subscriptions.size,
|
|
});
|
|
|
|
if (!notifyClient) {
|
|
return;
|
|
}
|
|
|
|
client.pushUnsubscribe(request.requestId);
|
|
|
|
logger.verbose(
|
|
`Delete client: ${parseWebsocket.clientId} | subscription: ${
|
|
request.requestId
|
|
}`
|
|
);
|
|
}
|
|
}
|
|
|
|
export { ParseLiveQueryServer };
|