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browser.js
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Fri, Jan 10, 02:55

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

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