feat: implement tc token handling

TC token is required in certain cases to receive presence updates on chats

src/Socket/chats.ts

@@ -494,14 +494,27 @@ export const makeChatsSocket = (config: SocketConfig) => {
 		}
 	}
 
-	const presenceSubscribe = (toJid: string) => (
+	/**
+	 * @param toJid the jid to subscribe to
+	 * @param tcToken token for subscription, use if present
+	 */
+	const presenceSubscribe = (toJid: string, tcToken?: Buffer) => (
 		sendNode({
 			tag: 'presence',
 			attrs: {
 				to: toJid,
 				id: generateMessageTag(),
 				type: 'subscribe'
-			}
+			},
+			content: tcToken
+				? [
+					{
+						tag: 'tctoken',
+						attrs: { },
+						content: tcToken
+					}
+				]
+				: undefined
 		})
 	)
 

src/Socket/messages-recv.ts

@@ -268,6 +268,21 @@ export const makeMessagesRecvSocket = (config: SocketConfig) => {
 		const from = jidNormalizedUser(node.attrs.from)
 
 		switch (nodeType) {
+		case 'privacy_token':
+			const tokenList = getBinaryNodeChildren(child, 'token')
+			for(const { attrs, content } of tokenList) {
+				const jid = attrs.jid
+				ev.emit('chats.update', [
+					{
+						id: jid,
+						tcToken: content as Buffer
+					}
+				])
+
+				logger.debug({ jid }, 'got privacy token update')
+			}
+
+			break
 		case 'w:gp2':
 			handleGroupNotification(node.attrs.participant, child, result)
 			break