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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.isTimestampInDuration = exports.getBeaconInfoIdentifier = exports.BeaconEvent = exports.Beacon = void 0;
var _contentHelpers = require("../content-helpers");
var _utils = require("../utils");
var _typedEventEmitter = require("./typed-event-emitter");
function _defineProperty(e, r, t) { return (r = _toPropertyKey(r)) in e ? Object.defineProperty(e, r, { value: t, enumerable: !0, configurable: !0, writable: !0 }) : e[r] = t, e; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == typeof i ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != typeof t || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != typeof i) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); } /*
Copyright 2022 The Matrix.org Foundation C.I.C.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
let BeaconEvent = exports.BeaconEvent = /*#__PURE__*/function (BeaconEvent) {
BeaconEvent["New"] = "Beacon.new";
BeaconEvent["Update"] = "Beacon.update";
BeaconEvent["LivenessChange"] = "Beacon.LivenessChange";
BeaconEvent["Destroy"] = "Beacon.Destroy";
BeaconEvent["LocationUpdate"] = "Beacon.LocationUpdate";
return BeaconEvent;
}({});
const isTimestampInDuration = (startTimestamp, durationMs, timestamp) => timestamp >= startTimestamp && startTimestamp + durationMs >= timestamp;
// beacon info events are uniquely identified by
// `<roomId>_<state_key>`
exports.isTimestampInDuration = isTimestampInDuration;
const getBeaconInfoIdentifier = event => `${event.getRoomId()}_${event.getStateKey()}`;
exports.getBeaconInfoIdentifier = getBeaconInfoIdentifier;
class Beacon extends _typedEventEmitter.TypedEventEmitter {
constructor(rootEvent) {
super();
this.rootEvent = rootEvent;
_defineProperty(this, "roomId", void 0);
// beaconInfo is assigned by setBeaconInfo in the constructor
// ! to make tsc believe it is definitely assigned
_defineProperty(this, "_beaconInfo", void 0);
_defineProperty(this, "_isLive", void 0);
_defineProperty(this, "livenessWatchTimeout", void 0);
_defineProperty(this, "_latestLocationEvent", void 0);
_defineProperty(this, "clearLatestLocation", () => {
this._latestLocationEvent = undefined;
this.emit(BeaconEvent.LocationUpdate, this.latestLocationState);
});
this.roomId = this.rootEvent.getRoomId();
this.setBeaconInfo(this.rootEvent);
}
get isLive() {
return !!this._isLive;
}
get identifier() {
return getBeaconInfoIdentifier(this.rootEvent);
}
get beaconInfoId() {
return this.rootEvent.getId();
}
get beaconInfoOwner() {
return this.rootEvent.getStateKey();
}
get beaconInfoEventType() {
return this.rootEvent.getType();
}
get beaconInfo() {
return this._beaconInfo;
}
get latestLocationState() {
return this._latestLocationEvent && (0, _contentHelpers.parseBeaconContent)(this._latestLocationEvent.getContent());
}
get latestLocationEvent() {
return this._latestLocationEvent;
}
update(beaconInfoEvent) {
if (getBeaconInfoIdentifier(beaconInfoEvent) !== this.identifier) {
throw new Error("Invalid updating event");
}
// don't update beacon with an older event
if (beaconInfoEvent.getTs() < this.rootEvent.getTs()) {
return;
}
this.rootEvent = beaconInfoEvent;
this.setBeaconInfo(this.rootEvent);
this.emit(BeaconEvent.Update, beaconInfoEvent, this);
this.clearLatestLocation();
}
destroy() {
if (this.livenessWatchTimeout) {
clearTimeout(this.livenessWatchTimeout);
}
this._isLive = false;
this.emit(BeaconEvent.Destroy, this.identifier);
}
/**
* Monitor liveness of a beacon
* Emits BeaconEvent.LivenessChange when beacon expires
*/
monitorLiveness() {
if (this.livenessWatchTimeout) {
clearTimeout(this.livenessWatchTimeout);
}
this.checkLiveness();
if (!this.beaconInfo) return;
if (this.isLive) {
const expiryInMs = this.beaconInfo.timestamp + this.beaconInfo.timeout - Date.now();
if (expiryInMs > 1) {
this.livenessWatchTimeout = setTimeout(() => {
this.monitorLiveness();
}, expiryInMs);
}
} else if (this.beaconInfo.timestamp > Date.now()) {
// beacon start timestamp is in the future
// check liveness again then
this.livenessWatchTimeout = setTimeout(() => {
this.monitorLiveness();
}, this.beaconInfo.timestamp - Date.now());
}
}
/**
* Process Beacon locations
* Emits BeaconEvent.LocationUpdate
*/
addLocations(beaconLocationEvents) {
// discard locations for beacons that are not live
if (!this.isLive) {
return;
}
const validLocationEvents = beaconLocationEvents.filter(event => {
const content = event.getContent();
const parsed = (0, _contentHelpers.parseBeaconContent)(content);
if (!parsed.uri || !parsed.timestamp) return false; // we won't be able to process these
const {
timestamp
} = parsed;
return this._beaconInfo.timestamp &&
// only include positions that were taken inside the beacon's live period
isTimestampInDuration(this._beaconInfo.timestamp, this._beaconInfo.timeout, timestamp) && (
// ignore positions older than our current latest location
!this.latestLocationState || timestamp > this.latestLocationState.timestamp);
});
const latestLocationEvent = validLocationEvents.sort(_utils.sortEventsByLatestContentTimestamp)?.[0];
if (latestLocationEvent) {
this._latestLocationEvent = latestLocationEvent;
this.emit(BeaconEvent.LocationUpdate, this.latestLocationState);
}
}
setBeaconInfo(event) {
this._beaconInfo = (0, _contentHelpers.parseBeaconInfoContent)(event.getContent());
this.checkLiveness();
}
checkLiveness() {
const prevLiveness = this.isLive;
// element web sets a beacon's start timestamp to the senders local current time
// when Alice's system clock deviates slightly from Bob's a beacon Alice intended to be live
// may have a start timestamp in the future from Bob's POV
// handle this by adding 6min of leniency to the start timestamp when it is in the future
if (!this.beaconInfo) return;
const startTimestamp = this.beaconInfo.timestamp > Date.now() ? this.beaconInfo.timestamp - 360000 /* 6min */ : this.beaconInfo.timestamp;
this._isLive = !!this._beaconInfo.live && !!startTimestamp && isTimestampInDuration(startTimestamp, this._beaconInfo.timeout, Date.now());
if (prevLiveness !== this.isLive) {
this.emit(BeaconEvent.LivenessChange, this.isLive, this);
}
}
}
exports.Beacon = Beacon;