Create Cloud function afterLiveQueryEvent (#6859)

* Before Connect + Before Subscribe #1

* Cleanup and Documentation

* Add E2E tests

* Bump parse to 2.15.0

* Create afterLiveQueryEvent

* Revert "Create afterLiveQueryEvent"

This reverts commit 828c678a6995216b843a75f5b3c864aec063ba43.

* afterLiveQueryEvent

* Add delete event

* Fix failing tests

* Fix lint

* Update ParseLiveQueryServer.js

* Remove Facebook AccountKit auth (#6870)

* Remove Facebook AccountKit auth

Account Kit services are no longer available.

https://developers.facebook.com/blog/post/2019/09/09/account-kit-services-no-longer-available-starting-march/

https://www.sinch.com/blog/facebook-account-kit-is-closing-down-are-your-apps-covered/

* remove flaky test

* fix: upgrade uuid from 8.2.0 to 8.3.0 (#6865)

Snyk has created this PR to upgrade uuid from 8.2.0 to 8.3.0.

See this package in npm:
https://www.npmjs.com/package/uuid

See this project in Snyk:
https://app.snyk.io/org/acinader/project/8c1a9edb-c8f5-4dc1-b221-4d6030a323eb?utm_source=github&utm_medium=upgrade-pr

Co-authored-by: Diamond Lewis <findlewis@gmail.com>

* fix: package.json & package-lock.json to reduce vulnerabilities (#6864)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-LODASH-590103

Co-authored-by: Diamond Lewis <findlewis@gmail.com>

* fix: upgrade ldapjs from 2.0.0 to 2.1.0 (#6857)

Snyk has created this PR to upgrade ldapjs from 2.0.0 to 2.1.0.

See this package in npm:
https://www.npmjs.com/package/ldapjs

See this project in Snyk:
https://app.snyk.io/org/acinader/project/8c1a9edb-c8f5-4dc1-b221-4d6030a323eb?utm_source=github&utm_medium=upgrade-pr

Co-authored-by: Diamond Lewis <findlewis@gmail.com>

* fix: upgrade apollo-server-express from 2.15.1 to 2.16.0 (#6851)

Snyk has created this PR to upgrade apollo-server-express from 2.15.1 to 2.16.0.

See this package in npm:
https://www.npmjs.com/package/apollo-server-express

See this project in Snyk:
https://app.snyk.io/org/acinader/project/8c1a9edb-c8f5-4dc1-b221-4d6030a323eb?utm_source=github&utm_medium=upgrade-pr

Co-authored-by: Diamond Lewis <findlewis@gmail.com>

* fix: upgrade @graphql-tools/stitch from 6.0.12 to 6.0.13 (#6845)

Snyk has created this PR to upgrade @graphql-tools/stitch from 6.0.12 to 6.0.13.

See this package in npm:
https://www.npmjs.com/package/@graphql-tools/stitch

See this project in Snyk:
https://app.snyk.io/org/acinader/project/8c1a9edb-c8f5-4dc1-b221-4d6030a323eb?utm_source=github&utm_medium=upgrade-pr

Co-authored-by: Diamond Lewis <findlewis@gmail.com>

* fix: upgrade @graphql-tools/utils from 6.0.12 to 6.0.13 (#6846)

Snyk has created this PR to upgrade @graphql-tools/utils from 6.0.12 to 6.0.13.

See this package in npm:
https://www.npmjs.com/package/@graphql-tools/utils

See this project in Snyk:
https://app.snyk.io/org/acinader/project/8c1a9edb-c8f5-4dc1-b221-4d6030a323eb?utm_source=github&utm_medium=upgrade-pr

Co-authored-by: Diamond Lewis <findlewis@gmail.com>

* [Snyk] Upgrade winston from 3.2.1 to 3.3.2 (#6799)

* fix: upgrade winston from 3.2.1 to 3.3.2

Snyk has created this PR to upgrade winston from 3.2.1 to 3.3.2.

See this package in NPM:
https://www.npmjs.com/package/winston

See this project in Snyk:
https://app.snyk.io/org/acinader/project/8c1a9edb-c8f5-4dc1-b221-4d6030a323eb?utm_source=github&utm_medium=upgrade-pr

* fix tests

Co-authored-by: Diamond Lewis <findlewis@gmail.com>

* afterLiveQueryEvent

* Add delete event

* Fix failing tests

* Before Connect + Before Subscribe #1

* Cleanup and Documentation

* Create afterLiveQueryEvent

* Revert "Create afterLiveQueryEvent"

This reverts commit 828c678a6995216b843a75f5b3c864aec063ba43.

* Update ParseLiveQueryServer.js

* Rebase

* Remove return value / deduplicate tests

* Add docs

* Add additional data to trigger

Co-authored-by: Diamond Lewis <findlewis@gmail.com>
Co-authored-by: Snyk bot <snyk-bot@snyk.io>

spec/ParseLiveQuery.spec.js

@@ -18,13 +18,468 @@ describe('ParseLiveQuery', function () {
     const query = new Parse.Query(TestObject);
     query.equalTo('objectId', object.id);
     const subscription = await query.subscribe();
-    subscription.on('update', async object => {
+    subscription.on('update', object => {
       expect(object.get('foo')).toBe('bar');
       done();
     });
     object.set({ foo: 'bar' });
     await object.save();
   });
+  it('expect afterEvent create', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      expect(req.event).toBe('Create');
+      expect(req.user).toBeUndefined();
+      expect(req.object.get('foo')).toBe('bar');
+    });
+
+    const query = new Parse.Query(TestObject);
+    const subscription = await query.subscribe();
+    subscription.on('create', object => {
+      expect(object.get('foo')).toBe('bar');
+      done();
+    });
+
+    const object = new TestObject();
+    object.set('foo', 'bar');
+    await object.save();
+  });
+
+  it('expect afterEvent payload', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    const object = new TestObject();
+    await object.save();
+
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      expect(req.event).toBe('Update');
+      expect(req.user).toBeUndefined();
+      expect(req.object.get('foo')).toBe('bar');
+      expect(req.original.get('foo')).toBeUndefined();
+      done();
+    });
+
+    const query = new Parse.Query(TestObject);
+    query.equalTo('objectId', object.id);
+    await query.subscribe();
+    object.set({ foo: 'bar' });
+    await object.save();
+  });
+
+  it('expect afterEvent enter', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      expect(req.event).toBe('Enter');
+      expect(req.user).toBeUndefined();
+      expect(req.object.get('foo')).toBe('bar');
+      expect(req.original.get('foo')).toBeUndefined();
+    });
+
+    const object = new TestObject();
+    await object.save();
+
+    const query = new Parse.Query(TestObject);
+    query.equalTo('foo', 'bar');
+    const subscription = await query.subscribe();
+    subscription.on('enter', object => {
+      expect(object.get('foo')).toBe('bar');
+      done();
+    });
+
+    object.set('foo', 'bar');
+    await object.save();
+  });
+
+  it('expect afterEvent leave', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      expect(req.event).toBe('Leave');
+      expect(req.user).toBeUndefined();
+      expect(req.object.get('foo')).toBeUndefined();
+      expect(req.original.get('foo')).toBe('bar');
+    });
+
+    const object = new TestObject();
+    object.set('foo', 'bar');
+    await object.save();
+
+    const query = new Parse.Query(TestObject);
+    query.equalTo('foo', 'bar');
+    const subscription = await query.subscribe();
+    subscription.on('leave', object => {
+      expect(object.get('foo')).toBeUndefined();
+      done();
+    });
+
+    object.unset('foo');
+    await object.save();
+  });
+
+  it('expect afterEvent delete', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      expect(req.event).toBe('Delete');
+      expect(req.user).toBeUndefined();
+      req.object.set('foo', 'bar');
+    });
+
+    const object = new TestObject();
+    await object.save();
+
+    const query = new Parse.Query(TestObject);
+    query.equalTo('objectId', object.id);
+
+    const subscription = await query.subscribe();
+    subscription.on('delete', object => {
+      expect(object.get('foo')).toBe('bar');
+      done();
+    });
+
+    await object.destroy();
+  });
+
+  it('can handle afterEvent modification', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    const object = new TestObject();
+    await object.save();
+
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      const current = req.object;
+      current.set('foo', 'yolo');
+
+      const original = req.original;
+      original.set('yolo', 'foo');
+    });
+
+    const query = new Parse.Query(TestObject);
+    query.equalTo('objectId', object.id);
+    const subscription = await query.subscribe();
+    subscription.on('update', (object, original) => {
+      expect(object.get('foo')).toBe('yolo');
+      expect(original.get('yolo')).toBe('foo');
+      done();
+    });
+    object.set({ foo: 'bar' });
+    await object.save();
+  });
+
+  it('can return different object in afterEvent', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    const object = new TestObject();
+    await object.save();
+
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      const object = new Parse.Object('Yolo');
+      req.object = object;
+    });
+
+    const query = new Parse.Query(TestObject);
+    query.equalTo('objectId', object.id);
+    const subscription = await query.subscribe();
+    subscription.on('update', object => {
+      expect(object.className).toBe('Yolo');
+      done();
+    });
+    object.set({ foo: 'bar' });
+    await object.save();
+  });
+
+  it('can handle afterEvent throw', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+
+    const object = new TestObject();
+    await object.save();
+
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      const current = req.object;
+      const original = req.original;
+
+      setTimeout(() => {
+        done();
+      }, 2000);
+
+      if (current.get('foo') != original.get('foo')) {
+        throw "Don't pass an update trigger, or message";
+      }
+    });
+
+    const query = new Parse.Query(TestObject);
+    query.equalTo('objectId', object.id);
+    const subscription = await query.subscribe();
+    subscription.on('update', () => {
+      fail('update should not have been called.');
+    });
+    subscription.on('error', () => {
+      fail('error should not have been called.');
+    });
+    object.set({ foo: 'bar' });
+    await object.save();
+  });
+  it('expect afterEvent create', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      expect(req.event).toBe('Create');
+      expect(req.user).toBeUndefined();
+      expect(req.object.get('foo')).toBe('bar');
+    });
+
+    const query = new Parse.Query(TestObject);
+    const subscription = await query.subscribe();
+    subscription.on('create', object => {
+      expect(object.get('foo')).toBe('bar');
+      done();
+    });
+
+    const object = new TestObject();
+    object.set('foo', 'bar');
+    await object.save();
+  });
+
+  it('expect afterEvent payload', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    const object = new TestObject();
+    await object.save();
+
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      expect(req.event).toBe('Update');
+      expect(req.user).toBeUndefined();
+      expect(req.object.get('foo')).toBe('bar');
+      expect(req.original.get('foo')).toBeUndefined();
+      done();
+    });
+
+    const query = new Parse.Query(TestObject);
+    query.equalTo('objectId', object.id);
+    await query.subscribe();
+    object.set({ foo: 'bar' });
+    await object.save();
+  });
+
+  it('expect afterEvent enter', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      expect(req.event).toBe('Enter');
+      expect(req.user).toBeUndefined();
+      expect(req.object.get('foo')).toBe('bar');
+      expect(req.original.get('foo')).toBeUndefined();
+    });
+
+    const object = new TestObject();
+    await object.save();
+
+    const query = new Parse.Query(TestObject);
+    query.equalTo('foo', 'bar');
+    const subscription = await query.subscribe();
+    subscription.on('enter', object => {
+      expect(object.get('foo')).toBe('bar');
+      done();
+    });
+
+    object.set('foo', 'bar');
+    await object.save();
+  });
+
+  it('expect afterEvent leave', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      expect(req.event).toBe('Leave');
+      expect(req.user).toBeUndefined();
+      expect(req.object.get('foo')).toBeUndefined();
+      expect(req.original.get('foo')).toBe('bar');
+    });
+
+    const object = new TestObject();
+    object.set('foo', 'bar');
+    await object.save();
+
+    const query = new Parse.Query(TestObject);
+    query.equalTo('foo', 'bar');
+    const subscription = await query.subscribe();
+    subscription.on('leave', object => {
+      expect(object.get('foo')).toBeUndefined();
+      done();
+    });
+
+    object.unset('foo');
+    await object.save();
+  });
+
+  it('expect afterEvent delete', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      expect(req.event).toBe('Delete');
+      expect(req.user).toBeUndefined();
+      req.object.set('foo', 'bar');
+    });
+
+    const object = new TestObject();
+    await object.save();
+
+    const query = new Parse.Query(TestObject);
+    query.equalTo('objectId', object.id);
+
+    const subscription = await query.subscribe();
+    subscription.on('delete', object => {
+      expect(object.get('foo')).toBe('bar');
+      done();
+    });
+
+    await object.destroy();
+  });
+
+  it('can handle afterEvent modification', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    const object = new TestObject();
+    await object.save();
+
+    Parse.Cloud.afterLiveQueryEvent('TestObject', req => {
+      const current = req.object;
+      current.set('foo', 'yolo');
+
+      const original = req.original;
+      original.set('yolo', 'foo');
+    });
+
+    const query = new Parse.Query(TestObject);
+    query.equalTo('objectId', object.id);
+    const subscription = await query.subscribe();
+    subscription.on('update', (object, original) => {
+      expect(object.get('foo')).toBe('yolo');
+      expect(original.get('yolo')).toBe('foo');
+      done();
+    });
+    object.set({ foo: 'bar' });
+    await object.save();
+  });
+
+  it('can handle async afterEvent modification', async done => {
+    await reconfigureServer({
+      liveQuery: {
+        classNames: ['TestObject'],
+      },
+      startLiveQueryServer: true,
+      verbose: false,
+      silent: true,
+    });
+    const parent = new TestObject();
+    const child = new TestObject();
+    child.set('bar', 'foo');
+    await Parse.Object.saveAll([parent, child]);
+
+    Parse.Cloud.afterLiveQueryEvent('TestObject', async req => {
+      const current = req.object;
+      const pointer = current.get('child');
+      await pointer.fetch();
+    });
+
+    const query = new Parse.Query(TestObject);
+    query.equalTo('objectId', parent.id);
+    const subscription = await query.subscribe();
+    subscription.on('update', object => {
+      expect(object.get('child')).toBeDefined();
+      expect(object.get('child').get('bar')).toBe('foo');
+      done();
+    });
+    parent.set('child', child);
+    await parent.save();
+  });
 
   it('can handle beforeConnect / beforeSubscribe hooks', async done => {
     await reconfigureServer({
@@ -58,7 +513,7 @@ describe('ParseLiveQuery', function () {
     const query = new Parse.Query(TestObject);
     query.equalTo('objectId', object.id);
     const subscription = await query.subscribe();
-    subscription.on('update', async object => {
+    subscription.on('update', object => {
       expect(object.get('foo')).toBe('bar');
       done();
     });

src/LiveQuery/ParseLiveQueryServer.js

@@ -14,6 +14,7 @@ import {
   runLiveQueryEventHandlers,
   maybeRunConnectTrigger,
   maybeRunSubscribeTrigger,
+  maybeRunAfterEventTrigger,
 } from '../triggers';
 import { getAuthForSessionToken, Auth } from '../Auth';
 import { getCacheController } from '../Controllers';
@@ -124,7 +125,7 @@ class ParseLiveQueryServer {
   _onAfterDelete(message: any): void {
     logger.verbose(Parse.applicationId + 'afterDelete is triggered');
 
-    const deletedParseObject = message.currentParseObject.toJSON();
+    let deletedParseObject = message.currentParseObject.toJSON();
     const classLevelPermissions = message.classLevelPermissions;
     const className = deletedParseObject.className;
     logger.verbose(
@@ -158,6 +159,7 @@ class ParseLiveQueryServer {
           const acl = message.currentParseObject.getACL();
           // Check CLP
           const op = this._getCLPOperation(subscription.query);
+          let res = {};
           this._matchesCLP(
             classLevelPermissions,
             message.currentParseObject,
@@ -173,6 +175,22 @@ class ParseLiveQueryServer {
               if (!isMatched) {
                 return null;
               }
+              res = {
+                event: 'Delete',
+                sessionToken: client.sessionToken,
+                object: deletedParseObject,
+                clients: this.clients.size,
+                subscriptions: this.subscriptions.size,
+                useMasterKey: client.hasMasterKey,
+                installationId: client.installationId
+              };
+              return maybeRunAfterEventTrigger('afterEvent', className, res);
+            })
+            .then(() => {
+              if (res.object && typeof res.object.toJSON === 'function') {
+                deletedParseObject = res.object.toJSON();
+                deletedParseObject.className = className;
+              }
               client.pushDelete(requestId, deletedParseObject);
             })
             .catch(error => {
@@ -193,7 +211,7 @@ class ParseLiveQueryServer {
       originalParseObject = message.originalParseObject.toJSON();
     }
     const classLevelPermissions = message.classLevelPermissions;
-    const currentParseObject = message.currentParseObject.toJSON();
+    let currentParseObject = message.currentParseObject.toJSON();
     const className = currentParseObject.className;
     logger.verbose(
       'ClassName: %s | ObjectId: %s',
@@ -243,6 +261,7 @@ class ParseLiveQueryServer {
           // Set current ParseObject ACL checking promise, if the object does not match
           // subscription, we do not need to check ACL
           let currentACLCheckingPromise;
+          let res = {};
           if (!isCurrentSubscriptionMatched) {
             currentACLCheckingPromise = Promise.resolve(false);
           } else {
@@ -267,40 +286,67 @@ class ParseLiveQueryServer {
                 currentACLCheckingPromise,
               ]);
             })
-            .then(
+            .then(([isOriginalMatched, isCurrentMatched]) => {
-              ([isOriginalMatched, isCurrentMatched]) => {
+              logger.verbose(
-                logger.verbose(
+                'Original %j | Current %j | Match: %s, %s, %s, %s | Query: %s',
-                  'Original %j | Current %j | Match: %s, %s, %s, %s | Query: %s',
+                originalParseObject,
-                  originalParseObject,
+                currentParseObject,
-                  currentParseObject,
+                isOriginalSubscriptionMatched,
-                  isOriginalSubscriptionMatched,
+                isCurrentSubscriptionMatched,
-                  isCurrentSubscriptionMatched,
+                isOriginalMatched,
-                  isOriginalMatched,
+                isCurrentMatched,
-                  isCurrentMatched,
+                subscription.hash
-                  subscription.hash
+              );
-                );
 
-                // Decide event type
+              // Decide event type
-                let type;
+              let type;
-                if (isOriginalMatched && isCurrentMatched) {
+              if (isOriginalMatched && isCurrentMatched) {
-                  type = 'Update';
+                type = 'Update';
-                } else if (isOriginalMatched && !isCurrentMatched) {
+              } else if (isOriginalMatched && !isCurrentMatched) {
-                  type = 'Leave';
+                type = 'Leave';
-                } else if (!isOriginalMatched && isCurrentMatched) {
+              } else if (!isOriginalMatched && isCurrentMatched) {
-                  if (originalParseObject) {
+                if (originalParseObject) {
-                    type = 'Enter';
+                  type = 'Enter';
-                  } else {
-                    type = 'Create';
-                  }
                 } else {
-                  return null;
+                  type = 'Create';
+                }
+              } else {
+                return null;
+              }
+              message.event = type;
+              res = {
+                event: type,
+                sessionToken: client.sessionToken,
+                object: currentParseObject,
+                original: originalParseObject,
+                clients: this.clients.size,
+                subscriptions: this.subscriptions.size,
+                useMasterKey: client.hasMasterKey,
+                installationId: client.installationId
+              };
+              return maybeRunAfterEventTrigger('afterEvent', className, res);
+            })
+            .then(
+              () => {
+                if (res.object && typeof res.object.toJSON === 'function') {
+                  currentParseObject = res.object.toJSON();
+                  currentParseObject.className =
+                    res.object.className || className;
+                }
+
+                if (res.original && typeof res.original.toJSON === 'function') {
+                  originalParseObject = res.original.toJSON();
+                  originalParseObject.className =
+                    res.original.className || className;
+                }
+                const functionName = 'push' + message.event;
+                if (client[functionName]) {
+                  client[functionName](
+                    requestId,
+                    currentParseObject,
+                    originalParseObject
+                  );
                 }
-                const functionName = 'push' + type;
-                client[functionName](
-                  requestId,
-                  currentParseObject,
-                  originalParseObject
-                );
               },
               error => {
                 logger.error('Matching ACL error : ', error);

src/cloud-code/Parse.Cloud.js

@@ -511,6 +511,32 @@ ParseCloud.onLiveQueryEvent = function (handler) {
   triggers.addLiveQueryEventHandler(handler, Parse.applicationId);
 };
 
+/**
+ * Registers an after live query server event function.
+ *
+ * **Available in Cloud Code only.**
+ *
+ * ```
+ * Parse.Cloud.afterLiveQueryEvent('MyCustomClass', (request) => {
+ *   // code here
+ * })
+ *```
+ *
+ * @method afterLiveQueryEvent
+ * @name Parse.Cloud.afterLiveQueryEvent
+ * @param {(String|Parse.Object)} arg1 The Parse.Object subclass to register the after live query event function for. This can instead be a String that is the className of the subclass.
+ * @param {Function} func The function to run after a live query event. This function can be async and should take one parameter, a {@link Parse.Cloud.LiveQueryEventTrigger}.
+ */
+ParseCloud.afterLiveQueryEvent = function (parseClass, handler) {
+  const className = getClassName(parseClass);
+  triggers.addTrigger(
+    triggers.Types.afterEvent,
+    className,
+    handler,
+    Parse.applicationId
+  );
+};
+
 ParseCloud._removeAllHooks = () => {
   triggers._unregisterAll();
 };
@@ -563,6 +589,19 @@ module.exports = ParseCloud;
  * @property {String} sessionToken If set, the session of the user that made the request.
  */
 
+/**
+ * @interface Parse.Cloud.LiveQueryEventTrigger
+ * @property {String} installationId If set, the installationId triggering the request.
+ * @property {Boolean} useMasterKey If true, means the master key was used.
+ * @property {Parse.User} user If set, the user that made the request.
+ * @property {String} sessionToken If set, the session of the user that made the request.
+ * @property {String} event The live query event that triggered the request.
+ * @property {Parse.Object} object The object triggering the hook.
+ * @property {Parse.Object} original If set, the object, as currently stored.
+ * @property {Integer} clients The number of clients connected.
+ * @property {Integer} subscriptions The number of subscriptions connected.
+ */
+
 /**
  * @interface Parse.Cloud.BeforeFindRequest
  * @property {String} installationId If set, the installationId triggering the request.

src/triggers.js

@@ -18,6 +18,7 @@ export const Types = {
   afterDeleteFile: 'afterDeleteFile',
   beforeConnect: 'beforeConnect',
   beforeSubscribe: 'beforeSubscribe',
+  afterEvent: 'afterEvent',
 };
 
 const FileClassName = '@File';
@@ -802,6 +803,25 @@ export async function maybeRunSubscribeTrigger(
   request.query = query;
 }
 
+export async function maybeRunAfterEventTrigger(
+  triggerType,
+  className,
+  request
+) {
+  const trigger = getTrigger(className, triggerType, Parse.applicationId);
+  if (!trigger) {
+    return;
+  }
+  if (request.object) {
+    request.object = Parse.Object.fromJSON(request.object);
+  }
+  if (request.original) {
+    request.original = Parse.Object.fromJSON(request.original);
+  }
+  request.user = await userForSessionToken(request.sessionToken);
+  return trigger(request);
+}
+
 async function userForSessionToken(sessionToken) {
   if (!sessionToken) {
     return;