Add support for MONITOR

lib/client.js

@@ -54,6 +54,7 @@ export default class Client extends EventTarget {
 	pingIntervalID = null;
 	pendingHistory = Promise.resolve(null);
 	cm = irc.CaseMapping.RFC1459;
+	monitored = new irc.CaseMapMap(null, irc.CaseMapping.RFC1459);
 	whoisDB = new irc.CaseMapMap(null, irc.CaseMapping.RFC1459);
 
 	constructor(params) {
@@ -97,6 +98,7 @@ export default class Client extends EventTarget {
 			this.batches = new Map();
 			this.pendingHistory = Promise.resolve(null);
 			this.isupport = new Map();
+			this.monitored = new irc.CaseMapMap(null, irc.CaseMapping.RFC1459);
 
 			if (this.autoReconnect) {
 				if (!navigator.onLine) {
@@ -199,6 +201,10 @@ export default class Client extends EventTarget {
 			if (changed.indexOf("CASEMAPPING") >= 0) {
 				this.setCaseMapping(this.isupport.get("CASEMAPPING"));
 			}
+			if (changed.indexOf("MONITOR") >= 0 && this.isupport.has("MONITOR")) {
+				let targets = Array.from(this.monitored.keys()).slice(0, this.maxMonitorTargets());
+				this.send({ command: "MONITOR", params: ["+", targets.join(",")] });
+			}
 			break;
 		case irc.RPL_ENDOFMOTD:
 		case irc.ERR_NOMOTD:
@@ -478,6 +484,7 @@ export default class Client extends EventTarget {
 		}
 
 		this.whoisDB = new irc.CaseMapMap(this.whoisDB, this.cm);
+		this.monitored = new irc.CaseMapMap(this.monitored, this.cm);
 	}
 
 	isServer(name) {
@@ -683,4 +690,40 @@ export default class Client extends EventTarget {
 			return networks;
 		});
 	}
+
+	maxMonitorTargets() {
+		if (!this.isupport.has("MONITOR")) {
+			return 0;
+		}
+		return parseInt(this.isupport.get("MONITOR"), 10);
+	}
+
+	monitor(target) {
+		if (this.monitored.has(target)) {
+			return;
+		}
+
+		this.monitored.set(target, true);
+
+		// TODO: add poll-based fallback when MONITOR is not supported
+		if (this.monitored.size + 1 > this.maxMonitorTargets()) {
+			return;
+		}
+
+		this.send({ command: "MONITOR", params: ["+", target] });
+	}
+
+	unmonitor(target) {
+		if (!this.monitored.has(target)) {
+			return;
+		}
+
+		this.monitored.delete(target);
+
+		if (!this.isupport.has("MONITOR")) {
+			return;
+		}
+
+		this.send({ command: "MONITOR", params: ["-", target] });
+	}
 }

lib/irc.js

@@ -42,6 +42,12 @@ export const ERR_UNAVAILRESOURCE = "437";
 // Other
 export const RPL_QUIETLIST = "728";
 export const RPL_ENDOFQUIETLIST = "729";
+// IRCv3 MONITOR: https://ircv3.net/specs/extensions/monitor
+export const RPL_MONONLINE = "730";
+export const RPL_MONOFFLINE = "731";
+export const RPL_MONLIST = "732";
+export const RPL_ENDOFMONLIST = "733";
+export const ERR_MONLISTFULL = "734";
 // IRCv3 SASL: https://ircv3.net/specs/extensions/sasl-3.1
 export const RPL_LOGGEDIN = "900";
 export const RPL_LOGGEDOUT = "901";
@@ -107,7 +113,7 @@ export function formatTags(tags) {
 	return l.join(";");
 }
 
-function parsePrefix(s) {
+export function parsePrefix(s) {
 	let prefix = {
 		name: null,
 		user: null,
@@ -306,6 +312,7 @@ export function isError(cmd) {
 	case ERR_SASLTOOLONG:
 	case ERR_SASLABORTED:
 	case ERR_SASLALREADY:
+	case ERR_MONLISTFULL:
 		return true;
 	case "FAIL":
 		return true;