feat: Event messages (#3345)

* feat: add createCallLink function

* feat: create Event class

* feat: add functionality for sending Events

* feat: add editEvent function

* refactor: send event location prop as wa does

* refactor: combine modules

* feat: add sendResponseToEvent function

* fix: createEventCallLink parameter

* docs: add documentation

* fix: eslint

* refactor: change timestamp to Date for the user's convenience

* refactor: rename 'Event' to 'ScheduledEvent' for more clarity

* style: fix typo in inner function

* refactor: remove unnecessary inner function

* refactor: rename 'sendResponseToEvent' to 'sendResponseToScheduledEvent' for more clarity

* fix: update the module name

src/Client.js

@@ -15,7 +15,7 @@ const { LoadUtils } = require('./util/Injected/Utils');
 const ChatFactory = require('./factories/ChatFactory');
 const ContactFactory = require('./factories/ContactFactory');
 const WebCacheFactory = require('./webCache/WebCacheFactory');
-const { Broadcast, Buttons, Call, ClientInfo, Contact, GroupNotification, Label, List, Location, Message, MessageMedia, Poll, PollVote, Reaction } = require('./structures');
+const { ClientInfo, Message, MessageMedia, Contact, Location, Poll, PollVote, GroupNotification, Label, Call, Buttons, List, Reaction, Broadcast, ScheduledEvent } = require('./structures');
 const NoAuth = require('./authStrategies/NoAuth');
 const {exposeFunctionIfAbsent} = require('./util/Puppeteer');
 
@@ -939,6 +939,9 @@ class Client extends EventEmitter {
         } else if (content instanceof Poll) {
             internalOptions.poll = content;
             content = '';
+        } else if (content instanceof ScheduledEvent) {
+            internalOptions.event = content;
+            content = '';
         } else if (content instanceof Contact) {
             internalOptions.contactCard = content.id._serialized;
             content = '';
@@ -2196,6 +2199,45 @@ class Client extends EventEmitter {
         }, chatId);
     }
   
+    /**
+     * Generates a WhatsApp call link (video call or voice call)
+     * @param {Date} startTime The start time of the call
+     * @param {string} callType The type of a WhatsApp call link to generate, valid values are: `video` | `voice`
+     * @returns {Promise<string>} The WhatsApp call link (https://call.whatsapp.com/video/XxXxXxXxXxXxXx) or an empty string if a generation failed.
+     */
+    async createCallLink(startTime, callType) {
+        if (!['video', 'voice'].includes(callType)) {
+            throw new class CreateCallLinkError extends Error {
+                constructor(m) { super(m); }
+            }('Invalid \'callType\' parameter value is provided. Valid values are: \'voice\' | \'video\'.');
+        }
+
+        startTime = Math.floor(startTime.getTime() / 1000);
+        
+        return await this.pupPage.evaluate(async (startTimeTs, callType) => {
+            const response = await window.Store.ScheduledEventMsgUtils.createEventCallLink(startTimeTs, callType);
+            return response ?? '';
+        }, startTime, callType);
+    }
+
+    /**
+     * Sends a response to the scheduled event message, indicating whether a user is going to attend the event or not
+     * @param {number} response The response code to the scheduled event message. Valid values are: `0` for NONE response (removes a previous response) | `1` for GOING | `2` for NOT GOING | `3` for MAYBE going
+     * @param {string} eventMessageId The scheduled event message ID
+     * @returns {Promise<boolean>}
+     */
+    async sendResponseToScheduledEvent(response, eventMessageId) {
+        if (![0, 1, 2, 3].includes(response)) return false;
+
+        return await this.pupPage.evaluate(async (response, msgId) => {
+            const eventMsg = window.Store.Msg.get(msgId) || (await window.Store.Msg.getMessagesById([msgId]))?.messages?.[0];
+            if (!eventMsg) return false;
+
+            await window.Store.ScheduledEventMsgUtils.sendEventResponseMsg(response, eventMsg);
+            return true;
+        }, response, eventMessageId);
+    }
+  
     /**
      * Save new contact to user's addressbook or edit the existing one
      * @param {string} phoneNumber The contact's phone number in a format "17182222222", where "1" is a country code

src/structures/Message.js

@@ -7,6 +7,7 @@ const Order = require('./Order');
 const Payment = require('./Payment');
 const Reaction = require('./Reaction');
 const Contact = require('./Contact');
+const ScheduledEvent = require('./ScheduledEvent'); // eslint-disable-line no-unused-vars
 const { MessageTypes } = require('../util/Constants');
 
 /**
@@ -51,7 +52,7 @@ class Message extends Base {
          * Message content
          * @type {string}
          */
-        this.body = this.hasMedia ? data.caption || '' : data.body || data.pollName || '';
+        this.body = this.hasMedia ? data.caption || '' : data.body || data.pollName || data.eventName || '';
 
         /**
          * Message type
@@ -699,6 +700,40 @@ class Message extends Base {
         }
         return null;
     }
+
+    /**
+     * Edits the current ScheduledEvent message.
+     * Once the scheduled event is canceled, it can not be edited.
+     * @param {ScheduledEvent} editedEventObject
+     * @returns {Promise<?Message>}
+     */
+    async editScheduledEvent(editedEventObject) {
+        if (!this.fromMe) {
+            return null;
+        }
+
+        const edittedEventMsg = await this.client.pupPage.evaluate(async (msgId, editedEventObject) => {
+            const msg = window.Store.Msg.get(msgId) || (await window.Store.Msg.getMessagesById([msgId]))?.messages?.[0];
+            if (!msg) return null;
+
+            const { name, startTimeTs, eventSendOptions } = editedEventObject;
+            const eventOptions = {
+                name: name,
+                description: eventSendOptions.description,
+                startTime: startTimeTs,
+                endTime: eventSendOptions.endTimeTs,
+                location: eventSendOptions.location,
+                callType: eventSendOptions.callType,
+                isEventCanceled: eventSendOptions.isEventCanceled,
+            };
+
+            await window.Store.ScheduledEventMsgUtils.sendEventEditMessage(eventOptions, msg);
+            const editedMsg = window.Store.Msg.get(msg.id._serialized);
+            return editedMsg?.serialize();
+        }, this.id._serialized, editedEventObject);
+
+        return edittedEventMsg && new Message(this.client, edittedEventMsg);
+    }
 }
 
 module.exports = Message;

src/structures/ScheduledEvent.js

@@ -0,0 +1,71 @@
+'use strict';
+
+/**
+ * ScheduledEvent send options
+ * @typedef {Object} ScheduledEventSendOptions
+ * @property {?string} description The scheduled event description
+ * @property {?Date} endTime The end time of the event
+ * @property {?string} location The location of the event
+ * @property {?string} callType The type of a WhatsApp call link to generate, valid values are: `video` | `voice`
+ * @property {boolean} [isEventCanceled = false] Indicates if a scheduled event should be sent as an already canceled
+ * @property {?Array<number>} messageSecret The custom message secret, can be used as an event ID. NOTE: it has to be a unique vector with a length of 32
+ */
+
+/** Represents a ScheduledEvent on WhatsApp */
+class ScheduledEvent {
+    /**
+     * @param {string} name
+     * @param {Date} startTime
+     * @param {ScheduledEventSendOptions} options
+     */
+    constructor(name, startTime, options = {}) {
+        /**
+         * The name of the event
+         * @type {string}
+         */
+        this.name = this._validateInputs('name', name).trim();
+
+        /**
+         * The start time of the event
+         * @type {number}
+         */
+        this.startTimeTs = Math.floor(startTime.getTime() / 1000);
+
+        /**
+         * The send options for the event
+         * @type {Object}
+         */
+        this.eventSendOptions = {
+            description: options.description?.trim(),
+            endTimeTs: options.endTime ? Math.floor(options.endTime.getTime() / 1000) : null,
+            location: options.location?.trim(),
+            callType: this._validateInputs('callType', options.callType),
+            isEventCanceled: options.isEventCanceled ?? false,
+            messageSecret: options.messageSecret
+        };
+    }
+
+    /**
+     * Inner function to validate input values
+     * @param {string} propName The property name to validate the value of
+     * @param {string | number} propValue The property value to validate
+     * @returns {string | number} The property value if a validation succeeded
+     */
+    _validateInputs(propName, propValue) {
+        if (propName === 'name' && !propValue) {
+            throw new class CreateScheduledEventError extends Error {
+                constructor(m) { super(m); }
+            }(`Empty '${propName}' parameter value is provided.`);
+        }
+
+        if (propName === 'callType' && propValue && !['video', 'voice'].includes(propValue)) {
+            throw new class CreateScheduledEventError extends Error {
+                constructor(m) { super(m); }
+            }(`Invalid '${propName}' parameter value is provided. Valid values are: 'voice' | 'video'.`);
+        }
+        
+        return propValue;
+    }
+}
+
+module.exports = ScheduledEvent;

src/structures/index.js

@@ -22,5 +22,6 @@ module.exports = {
     Reaction: require('./Reaction'),
     Poll: require('./Poll'),
     PollVote: require('./PollVote'),
-    Broadcast: require('./Broadcast')
+    Broadcast: require('./Broadcast'),
+    ScheduledEvent: require('./ScheduledEvent'),
 };

src/util/Constants.js

@@ -111,6 +111,7 @@ exports.MessageTypes = {
     REACTION: 'reaction',
     TEMPLATE_BUTTON_REPLY: 'template_button_reply',
     POLL_CREATION: 'poll_creation',
+    SCHEDULED_EVENT_CREATION: 'scheduled_event_creation',
 };
 
 /**

src/util/Injected/Store.js

@@ -114,6 +114,11 @@ exports.ExposeStore = () => {
     window.Store.ForwardUtils = {
         ...window.require('WAWebChatForwardMessage')
     };
+    window.Store.ScheduledEventMsgUtils = {
+        ...window.require('WAWebGenerateEventCallLink'),
+        ...window.require('WAWebSendEventEditMsgAction'),
+        ...window.require('WAWebSendEventResponseMsgAction')
+    };
     window.Store.VCard = {
         ...window.require('WAWebFrontendVcardUtils'),
         ...window.require('WAWebVcardParsingUtils'),

src/util/Injected/Utils.js

@@ -116,6 +116,34 @@ exports.LoadUtils = () => {
             delete options.poll;
         }
 
+        let eventOptions = {};
+        if (options.event) {
+            const { name, startTimeTs, eventSendOptions } = options.event;
+            const { messageSecret } = eventSendOptions;
+            eventOptions = {
+                type: 'event_creation',
+                eventName: name,
+                eventDescription: eventSendOptions.description,
+                eventStartTime: startTimeTs,
+                eventEndTime: eventSendOptions.endTimeTs,
+                eventLocation: eventSendOptions.location && {
+                    degreesLatitude: 0,
+                    degreesLongitude: 0,
+                    name: eventSendOptions.location
+                },
+                eventJoinLink: await window.Store.ScheduledEventMsgUtils.createEventCallLink(
+                    startTimeTs,
+                    eventSendOptions.callType
+                ),
+                isEventCanceled: eventSendOptions.isEventCanceled,
+                messageSecret:
+                    Array.isArray(messageSecret) && messageSecret.length === 32
+                        ? new Uint8Array(messageSecret)
+                        : window.crypto.getRandomValues(new Uint8Array(32)),
+            };
+            delete options.event;
+        }
+
         let vcardOptions = {};
         if (options.contactCard) {
             let contact = window.Store.Contact.get(options.contactCard);
@@ -255,6 +283,7 @@ exports.LoadUtils = () => {
             ...quotedMsgOptions,
             ...locationOptions,
             ..._pollOptions,
+            ...eventOptions,
             ...vcardOptions,
             ...buttonOptions,
             ...listOptions,