InfiniteAPI/src/Utils/process-message.ts

import { AxiosRequestConfig } from 'axios'
import type { Logger } from 'pino'
import { proto } from '../../WAProto'
import { AuthenticationCreds, BaileysEventEmitter, Chat, GroupMetadata, InitialReceivedChatsState, ParticipantAction, SignalKeyStoreWithTransaction, WAMessageStubType } from '../Types'
import { downloadAndProcessHistorySyncNotification, normalizeMessageContent, toNumber } from '../Utils'
import { areJidsSameUser, jidNormalizedUser } from '../WABinary'

type ProcessMessageContext = {
	historyCache: Set<string>
	recvChats: InitialReceivedChatsState
	downloadHistory: boolean
	creds: AuthenticationCreds
	keyStore: SignalKeyStoreWithTransaction
	ev: BaileysEventEmitter
	logger?: Logger
	options: AxiosRequestConfig<any>
}

const MSG_MISSED_CALL_TYPES = new Set([
	WAMessageStubType.CALL_MISSED_GROUP_VIDEO,
	WAMessageStubType.CALL_MISSED_GROUP_VOICE,
	WAMessageStubType.CALL_MISSED_VIDEO,
	WAMessageStubType.CALL_MISSED_VOICE
])

/** Cleans a received message to further processing */
export const cleanMessage = (message: proto.IWebMessageInfo, meId: string) => {
	// ensure remoteJid and participant doesn't have device or agent in it
	message.key.remoteJid = jidNormalizedUser(message.key.remoteJid!)
	message.key.participant = message.key.participant ? jidNormalizedUser(message.key.participant!) : undefined
	const content = normalizeMessageContent(message.message)
	// if the message has a reaction, ensure fromMe & remoteJid are from our perspective
	if(content?.reactionMessage) {
		const msgKey = content.reactionMessage.key!
		// if the reaction is from another user
		// we've to correctly map the key to this user's perspective
		if(!message.key.fromMe) {
			// if the sender believed the message being reacted to is not from them
			// we've to correct the key to be from them, or some other participant
			msgKey.fromMe = !msgKey.fromMe
				? areJidsSameUser(msgKey.participant || msgKey.remoteJid!, meId)
				// if the message being reacted to, was from them
				// fromMe automatically becomes false
				: false
			// set the remoteJid to being the same as the chat the message came from
			msgKey.remoteJid = message.key.remoteJid
			// set participant of the message
			msgKey.participant = msgKey.participant || message.key.participant
		}
	}
}

export const isRealMessage = (message: proto.IWebMessageInfo) => {
	const normalizedContent = normalizeMessageContent(message.message)
	return (
		!!normalizedContent
		|| MSG_MISSED_CALL_TYPES.has(message.messageStubType!)
	)
	&& !normalizedContent?.protocolMessage
	&& !normalizedContent?.reactionMessage
}

export const shouldIncrementChatUnread = (message: proto.IWebMessageInfo) => (
	!message.key.fromMe && !message.messageStubType
)

const processMessage = async(
	message: proto.IWebMessageInfo,
	{ downloadHistory, ev, historyCache, recvChats, creds, keyStore, logger, options }: ProcessMessageContext
) => {
	const meId = creds.me!.id
	const { accountSettings } = creds

	const chat: Partial<Chat> = { id: jidNormalizedUser(message.key.remoteJid!) }

	if(isRealMessage(message)) {
		chat.conversationTimestamp = toNumber(message.messageTimestamp)
		// only increment unread count if not CIPHERTEXT and from another person
		if(shouldIncrementChatUnread(message)) {
			chat.unreadCount = (chat.unreadCount || 0) + 1
		}

		if(accountSettings?.unarchiveChats) {
			chat.archive = false
			chat.readOnly = false
		}
	}

	const content = normalizeMessageContent(message.message)
	const protocolMsg = content?.protocolMessage
	if(protocolMsg) {
		switch (protocolMsg.type) {
		case proto.Message.ProtocolMessage.Type.HISTORY_SYNC_NOTIFICATION:
			const histNotification = protocolMsg!.historySyncNotification!

			logger?.info({ histNotification, id: message.key.id }, 'got history notification')

			if(downloadHistory) {
				const isLatest = !creds.processedHistoryMessages?.length
				const { chats, contacts, messages, didProcess } = await downloadAndProcessHistorySyncNotification(
					histNotification,
					historyCache,
					recvChats,
					options
				)

				if(chats.length) {
					ev.emit('chats.set', { chats, isLatest })
				}

				if(messages.length) {
					ev.emit('messages.set', { messages, isLatest })
				}

				if(contacts.length) {
					ev.emit('contacts.set', { contacts, isLatest })
				}

				if(didProcess) {
					ev.emit('creds.update', {
						processedHistoryMessages: [
							...(creds.processedHistoryMessages || []),
							{ key: message.key, messageTimestamp: message.messageTimestamp }
						]
					})
				}
			}

			break
		case proto.Message.ProtocolMessage.Type.APP_STATE_SYNC_KEY_SHARE:
			const keys = protocolMsg.appStateSyncKeyShare!.keys
			if(keys?.length) {
				let newAppStateSyncKeyId = ''
				await keyStore.transaction(
					async() => {
						for(const { keyData, keyId } of keys) {
							const strKeyId = Buffer.from(keyId!.keyId!).toString('base64')

							logger?.info({ strKeyId }, 'injecting new app state sync key')
							await keyStore.set({ 'app-state-sync-key': { [strKeyId]: keyData! } })

							newAppStateSyncKeyId = strKeyId
						}
					}
				)

				ev.emit('creds.update', { myAppStateKeyId: newAppStateSyncKeyId })
			} else {
				logger?.info({ protocolMsg }, 'recv app state sync with 0 keys')
			}

			break
		case proto.Message.ProtocolMessage.Type.REVOKE:
			ev.emit('messages.update', [
				{
					key: {
						...message.key,
						id: protocolMsg.key!.id
					},
					update: { message: null, messageStubType: WAMessageStubType.REVOKE, key: message.key }
				}
			])
			break
		case proto.Message.ProtocolMessage.Type.EPHEMERAL_SETTING:
			Object.assign(chat, {
				ephemeralSettingTimestamp: toNumber(message.messageTimestamp),
				ephemeralExpiration: protocolMsg.ephemeralExpiration || null
			})
			break
		}
	} else if(content?.reactionMessage) {
		const reaction: proto.IReaction = {
			...content.reactionMessage,
			key: message.key,
		}
		ev.emit('messages.reaction', [{
			reaction,
			key: content.reactionMessage!.key!,
		}])
	} else if(message.messageStubType) {
		const jid = message.key!.remoteJid!
		//let actor = whatsappID (message.participant)
		let participants: string[]
		const emitParticipantsUpdate = (action: ParticipantAction) => (
			ev.emit('group-participants.update', { id: jid, participants, action })
		)
		const emitGroupUpdate = (update: Partial<GroupMetadata>) => {
			ev.emit('groups.update', [{ id: jid, ...update }])
		}

		const participantsIncludesMe = () => participants.find(jid => areJidsSameUser(meId, jid))

		switch (message.messageStubType) {
		case WAMessageStubType.GROUP_PARTICIPANT_LEAVE:
		case WAMessageStubType.GROUP_PARTICIPANT_REMOVE:
			participants = message.messageStubParameters || []
			emitParticipantsUpdate('remove')
			// mark the chat read only if you left the group
			if(participantsIncludesMe()) {
				chat.readOnly = true
			}

			break
		case WAMessageStubType.GROUP_PARTICIPANT_ADD:
		case WAMessageStubType.GROUP_PARTICIPANT_INVITE:
		case WAMessageStubType.GROUP_PARTICIPANT_ADD_REQUEST_JOIN:
			participants = message.messageStubParameters || []
			if(participantsIncludesMe()) {
				chat.readOnly = false
			}

			emitParticipantsUpdate('add')
			break
		case WAMessageStubType.GROUP_PARTICIPANT_DEMOTE:
			participants = message.messageStubParameters || []
			emitParticipantsUpdate('demote')
			break
		case WAMessageStubType.GROUP_PARTICIPANT_PROMOTE:
			participants = message.messageStubParameters || []
			emitParticipantsUpdate('promote')
			break
		case WAMessageStubType.GROUP_CHANGE_ANNOUNCE:
			const announceValue = message.messageStubParameters?.[0]
			emitGroupUpdate({ announce: announceValue === 'true' || announceValue === 'on' })
			break
		case WAMessageStubType.GROUP_CHANGE_RESTRICT:
			const restrictValue = message.messageStubParameters?.[0]
			emitGroupUpdate({ restrict: restrictValue === 'true' || restrictValue === 'on' })
			break
		case WAMessageStubType.GROUP_CHANGE_SUBJECT:
			const name = message.messageStubParameters?.[0]
			chat.name = name
			emitGroupUpdate({ subject: name })
			break
		}
	}

	if(Object.keys(chat).length > 1) {
		ev.emit('chats.update', [chat])
	}
}

export default processMessage