refactor: move processMessage out of socket

src/Utils/process-message.ts

@@ -0,0 +1,167 @@
+import type { Logger } from 'pino'
+import { proto } from '../../WAProto'
+import { BaileysEventMap, Chat, GroupMetadata, ParticipantAction, SignalKeyStoreWithTransaction, WAMessageStubType } from '../Types'
+import { downloadAndProcessHistorySyncNotification, normalizeMessageContent, toNumber } from '../Utils'
+import { areJidsSameUser, jidNormalizedUser } from '../WABinary'
+
+type ProcessMessageContext = {
+	historyCache: Set<string>,
+	meId: string,
+	keyStore: SignalKeyStoreWithTransaction,
+	logger?: Logger
+	treatCiphertextMessagesAsReal?: boolean
+}
+
+const processMessage = async(
+	message: proto.IWebMessageInfo,
+	{ historyCache, meId, keyStore, logger, treatCiphertextMessagesAsReal }: ProcessMessageContext
+) => {
+	const map: Partial<BaileysEventMap<any>> = { }
+
+	const chat: Partial<Chat> = { id: jidNormalizedUser(message.key.remoteJid) }
+
+	const normalizedContent = !!message.message && normalizeMessageContent(message.message)
+	if(
+		(
+			!!normalizedContent ||
+			(message.messageStubType === WAMessageStubType.CIPHERTEXT && treatCiphertextMessagesAsReal)
+		)
+		&& !normalizedContent?.protocolMessage
+		&& !normalizedContent?.reactionMessage
+	) {
+		chat.conversationTimestamp = toNumber(message.messageTimestamp)
+		if(!message.key.fromMe) {
+			chat.unreadCount = (chat.unreadCount || 0) + 1
+		}
+	}
+
+	const content = normalizeMessageContent(message.message)
+	const protocolMsg = content?.protocolMessage
+	if(protocolMsg) {
+		switch (protocolMsg.type) {
+		case proto.ProtocolMessage.ProtocolMessageType.HISTORY_SYNC_NOTIFICATION:
+			const histNotification = protocolMsg!.historySyncNotification
+
+			logger?.info({ histNotification, id: message.key.id }, 'got history notification')
+
+			const { chats, contacts, messages, isLatest } = await downloadAndProcessHistorySyncNotification(histNotification, historyCache)
+
+			if(chats.length) {
+				map['chats.set'] = { chats, isLatest }
+			}
+
+			if(messages.length) {
+				map['messages.set'] = { messages, isLatest }
+			}
+
+			if(contacts.length) {
+				map['contacts.set'] = { contacts }
+			}
+
+			break
+		case proto.ProtocolMessage.ProtocolMessageType.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
+						}
+					}
+				)
+
+				map['creds.update'] = { myAppStateKeyId: newAppStateSyncKeyId }
+			} else {
+				logger?.info({ protocolMsg }, 'recv app state sync with 0 keys')
+			}
+
+			break
+		case proto.ProtocolMessage.ProtocolMessageType.REVOKE:
+			map['messages.update'] = [
+				{
+					key: {
+						...message.key,
+						id: protocolMsg.key!.id
+					},
+					update: { message: null, messageStubType: WAMessageStubType.REVOKE, key: message.key }
+				}
+			]
+			break
+		case proto.ProtocolMessage.ProtocolMessageType.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,
+		}
+		const operation = content.reactionMessage?.text ? 'add' : 'remove'
+		map['messages.reaction'] = { reaction, key: content.reactionMessage!.key!, operation }
+	} else if(message.messageStubType) {
+		const jid = message.key!.remoteJid!
+		//let actor = whatsappID (message.participant)
+		let participants: string[]
+		const emitParticipantsUpdate = (action: ParticipantAction) => (
+			map['group-participants.update'] = { id: jid, participants, action }
+		)
+		const emitGroupUpdate = (update: Partial<GroupMetadata>) => {
+			map['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_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) {
+		map['chats.update'] = [chat]
+	}
+
+	return map
+}
+
+export default processMessage