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] });
+	}
 }