serverless-offline-dnsresolver/dist/index.js

Serverless dns proxy plugin to be used together with serverless offline in order to return mock dns responses.

"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
var dns = require("dns");
var lodash_1 = require("lodash");
var nativeDns = require("native-dns");
var ServerlessOfflineDnsResolver = /** @class */ (function () {
    function ServerlessOfflineDnsResolver(serverless, options) {
        var _this = this;
        this.options = options;
        this.serverless = serverless;
        this.hooks = {
            "before:offline:start:init": function () { return _this.start(); },
            "after:offline:start:end": function () { return _this.stop(); },
        };
    }
    ServerlessOfflineDnsResolver.prototype.start = function () {
        return __awaiter(this, void 0, void 0, function () {
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        this.log('starting plugin');
                        this.init();
                        return [4 /*yield*/, this.listen()];
                    case 1:
                        _a.sent();
                        return [2 /*return*/];
                }
            });
        });
    };
    ServerlessOfflineDnsResolver.prototype.stop = function () {
        return __awaiter(this, void 0, void 0, function () {
            return __generator(this, function (_a) {
                this.log("stopping plugin");
                this.server.close();
                return [2 /*return*/];
            });
        });
    };
    ServerlessOfflineDnsResolver.prototype.handleDnsRequest = function (request, response) {
        var _this = this;
        request.question.forEach(function (question) {
            var entry = _this.resolve.filter(function (r) { return new RegExp(r.domain, 'i').exec(question.name); });
            // a local resolved host
            if (entry.length) {
                entry[0].records.forEach(function (record) {
                    record.name = question.name;
                    record.ttl = record.ttl || 60;
                    response.answer.push(nativeDns[record.type](record));
                });
            }
        });
        if (!response.answer.length) {
            response.header.rcode = nativeDns.consts.NAME_TO_RCODE.NOTZONE;
        }
        response.send();
    };
    ServerlessOfflineDnsResolver.prototype.log = function (msg, prefix) {
        if (prefix === void 0) { prefix = "INFO[serverless-offline-dnsresolver]: "; }
        this.serverless.cli.log.call(this.serverless.cli, prefix + msg);
    };
    ServerlessOfflineDnsResolver.prototype.listen = function () {
        return __awaiter(this, void 0, void 0, function () {
            var _this = this;
            return __generator(this, function (_a) {
                return [2 /*return*/, new Promise(function (resolve, reject) {
                        var server = nativeDns.createServer();
                        server.on('listening', function () {
                            _this.log("server listening on " + server.address().address + ":" + server.address().port);
                            _this.originalServers = dns.getServers();
                            var servers = [server.address().address + ":" + server.address().port].concat(_this.originalServers);
                            dns.setServers(servers);
                            resolve();
                        });
                        server.on('close', function () {
                            dns.setServers(_this.originalServers);
                            _this.log('server closed');
                        });
                        server.on('error', function (err, buff, req, res) {
                            console.error(err.stack);
                            reject(err);
                        });
                        server.on('socketError', function (err, socket) { return console.error(err); });
                        server.on('request', _this.handleDnsRequest.bind(_this));
                        server.serve(_this.port, 'localhost');
                        _this.server = server;
                    })];
            });
        });
    };
    ServerlessOfflineDnsResolver.prototype.init = function () {
        process.env = lodash_1.extend({}, this.serverless.service.provider.environment, process.env);
        this.config = this.serverless.service.custom["serverless-offline-dnsresolver"] || {};
        this.port = this.config.port || 15536;
        this.resolveFile = process.cwd() + (this.config.resolveFile || '/dns-resolve.js');
        this.log('Use Resolve File: ' + this.resolveFile);
        this.resolve = require(this.resolveFile)();
    };
    return ServerlessOfflineDnsResolver;
}());
module.exports = ServerlessOfflineDnsResolver;