179 lines
6.9 KiB
JavaScript
179 lines
6.9 KiB
JavaScript
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"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.Browser = void 0;
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const dns_txt_1 = __importDefault(require("./dns-txt"));
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const dns_equal_1 = __importDefault(require("./utils/dns-equal"));
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const events_1 = require("events");
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const service_types_1 = require("./service-types");
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const filter_service_1 = __importDefault(require("./utils/filter-service"));
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const filter_txt_1 = __importDefault(require("./utils/filter-txt"));
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const equal_txt_1 = __importDefault(require("./utils/equal-txt"));
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const TLD = '.local';
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const WILDCARD = '_services._dns-sd._udp' + TLD;
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class Browser extends events_1.EventEmitter {
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constructor(mdns, opts, onup) {
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super();
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this.onresponse = undefined;
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this.serviceMap = {};
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this.wildcard = false;
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this._services = [];
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if (typeof opts === 'function')
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return new Browser(mdns, null, opts);
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this.mdns = mdns;
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this.txt = new dns_txt_1.default(opts !== null && opts.txt != null ? opts.txt : undefined);
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if (opts === null || opts.type === undefined) {
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this.name = WILDCARD;
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this.wildcard = true;
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}
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else {
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this.name = (0, service_types_1.toString)({ name: opts.type, protocol: opts.protocol || 'tcp' }) + TLD;
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if (opts.name)
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this.name = opts.name + '.' + this.name;
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this.wildcard = false;
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}
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if (opts != null && opts.txt !== undefined)
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this.txtQuery = (0, filter_txt_1.default)(opts.txt);
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if (onup)
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this.on('up', onup);
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this.start();
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}
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start() {
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if (this.onresponse || this.name === undefined)
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return;
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var self = this;
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var nameMap = {};
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if (!this.wildcard)
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nameMap[this.name] = true;
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this.onresponse = (packet, rinfo) => {
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if (self.wildcard) {
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packet.answers.forEach((answer) => {
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if (answer.type !== 'PTR' || answer.name !== self.name || answer.name in nameMap)
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return;
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nameMap[answer.data] = true;
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self.mdns.query(answer.data, 'PTR');
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});
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}
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Object.keys(nameMap).forEach(function (name) {
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self.goodbyes(name, packet).forEach(self.removeService.bind(self));
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var matches = self.buildServicesFor(name, packet, self.txt, rinfo);
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if (matches.length === 0)
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return;
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matches.forEach((service) => {
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if (self.serviceMap[service.fqdn]) {
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self.updateService(service);
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return;
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}
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self.addService(service);
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});
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});
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};
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this.mdns.on('response', this.onresponse);
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this.update();
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}
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stop() {
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if (!this.onresponse)
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return;
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this.mdns.removeListener('response', this.onresponse);
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this.onresponse = undefined;
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}
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update() {
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this.mdns.query(this.name, 'PTR');
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}
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get services() {
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return this._services;
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}
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addService(service) {
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if ((0, filter_service_1.default)(service, this.txtQuery) === false)
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return;
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this._services.push(service);
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this.serviceMap[service.fqdn] = true;
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this.emit('up', service);
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}
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updateService(service) {
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var _a;
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if ((0, equal_txt_1.default)(service.txt, ((_a = this._services.find((s) => (0, dns_equal_1.default)(s.fqdn, service.fqdn))) === null || _a === void 0 ? void 0 : _a.txt) || {}))
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return;
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if (!(0, filter_service_1.default)(service, this.txtQuery)) {
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this.removeService(service.fqdn);
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return;
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}
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this._services = this._services.map(function (s) {
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if (!(0, dns_equal_1.default)(s.fqdn, service.fqdn))
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return s;
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return service;
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});
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this.emit('txt-update', service);
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}
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removeService(fqdn) {
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var service, index;
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this._services.some(function (s, i) {
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if ((0, dns_equal_1.default)(s.fqdn, fqdn)) {
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service = s;
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index = i;
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return true;
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}
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});
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if (!service || index === undefined)
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return;
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this._services.splice(index, 1);
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delete this.serviceMap[fqdn];
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this.emit('down', service);
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}
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goodbyes(name, packet) {
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return packet.answers.concat(packet.additionals)
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.filter((rr) => rr.type === 'PTR' && rr.ttl === 0 && (0, dns_equal_1.default)(rr.name, name))
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.map((rr) => rr.data);
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}
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buildServicesFor(name, packet, txt, referer) {
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var records = packet.answers.concat(packet.additionals).filter((rr) => rr.ttl > 0);
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return records
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.filter((rr) => rr.type === 'PTR' && (0, dns_equal_1.default)(rr.name, name))
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.map((ptr) => {
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const service = {
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addresses: [],
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subtypes: []
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};
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records.filter((rr) => {
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return (rr.type === 'PTR' && (0, dns_equal_1.default)(rr.data, ptr.data) && rr.name.includes('._sub'));
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}).forEach((rr) => {
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const types = (0, service_types_1.toType)(rr.name);
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service.subtypes.push(types.subtype);
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});
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records
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.filter((rr) => {
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return (rr.type === 'SRV' || rr.type === 'TXT') && (0, dns_equal_1.default)(rr.name, ptr.data);
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})
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.forEach((rr) => {
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if (rr.type === 'SRV') {
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var parts = rr.name.split('.');
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var name = parts[0];
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var types = (0, service_types_1.toType)(parts.slice(1, -1).join('.'));
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service.name = name;
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service.fqdn = rr.name;
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service.host = rr.data.target;
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service.referer = referer;
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service.port = rr.data.port;
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service.type = types.name;
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service.protocol = types.protocol;
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}
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else if (rr.type === 'TXT') {
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service.rawTxt = rr.data;
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service.txt = this.txt.decodeAll(rr.data);
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}
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});
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if (!service.name)
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return;
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records
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.filter((rr) => (rr.type === 'A' || rr.type === 'AAAA') && (0, dns_equal_1.default)(rr.name, service.host))
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.forEach((rr) => service.addresses.push(rr.data));
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return service;
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})
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.filter((rr) => !!rr);
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}
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}
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exports.Browser = Browser;
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exports.default = Browser;
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//# sourceMappingURL=browser.js.map
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