/* eslint no-console: 0 */
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'use strict';
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const urllib = require('url');
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const util = require('util');
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const fs = require('fs');
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const fetch = require('../fetch');
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const dns = require('dns');
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const net = require('net');
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const DNS_TTL = 5 * 60 * 1000;
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const resolver = (family, hostname, callback) => {
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dns['resolve' + family](hostname, (err, addresses) => {
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if (err) {
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switch (err.code) {
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case dns.NODATA:
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case dns.NOTFOUND:
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case dns.NOTIMP:
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case dns.SERVFAIL:
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case dns.CONNREFUSED:
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case 'EAI_AGAIN':
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return callback(null, []);
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}
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return callback(err);
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}
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return callback(null, Array.isArray(addresses) ? addresses : [].concat(addresses || []));
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});
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};
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const dnsCache = (module.exports.dnsCache = new Map());
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module.exports.resolveHostname = (options, callback) => {
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options = options || {};
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if (!options.host || net.isIP(options.host)) {
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// nothing to do here
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let value = {
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host: options.host,
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servername: options.servername || false
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};
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return callback(null, value);
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}
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let cached;
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if (dnsCache.has(options.host)) {
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cached = dnsCache.get(options.host);
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if (!cached.expires || cached.expires >= Date.now()) {
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return callback(null, {
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host: cached.value.host,
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servername: cached.value.servername,
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_cached: true
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});
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}
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}
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resolver(4, options.host, (err, addresses) => {
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if (err) {
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if (cached) {
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// ignore error, use expired value
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return callback(null, cached.value);
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}
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return callback(err);
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}
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if (addresses && addresses.length) {
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let value = {
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host: addresses[0] || options.host,
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servername: options.servername || options.host
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};
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dnsCache.set(options.host, {
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value,
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expires: Date.now() + DNS_TTL
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});
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return callback(null, value);
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}
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resolver(6, options.host, (err, addresses) => {
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if (err) {
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if (cached) {
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// ignore error, use expired value
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return callback(null, cached.value);
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}
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return callback(err);
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}
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if (addresses && addresses.length) {
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let value = {
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host: addresses[0] || options.host,
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servername: options.servername || options.host
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};
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dnsCache.set(options.host, {
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value,
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expires: Date.now() + DNS_TTL
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});
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return callback(null, value);
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}
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try {
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dns.lookup(options.host, {}, (err, address) => {
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if (err) {
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if (cached) {
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// ignore error, use expired value
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return callback(null, cached.value);
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}
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return callback(err);
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}
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if (!address && cached) {
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// nothing was found, fallback to cached value
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return callback(null, cached.value);
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}
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let value = {
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host: address || options.host,
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servername: options.servername || options.host
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};
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dnsCache.set(options.host, {
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value,
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expires: Date.now() + DNS_TTL
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});
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return callback(null, value);
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});
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} catch (err) {
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if (cached) {
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// ignore error, use expired value
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return callback(null, cached.value);
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}
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return callback(err);
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}
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});
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});
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};
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/**
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* Parses connection url to a structured configuration object
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*
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* @param {String} str Connection url
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* @return {Object} Configuration object
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*/
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module.exports.parseConnectionUrl = str => {
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str = str || '';
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let options = {};
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[urllib.parse(str, true)].forEach(url => {
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let auth;
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switch (url.protocol) {
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case 'smtp:':
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options.secure = false;
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break;
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case 'smtps:':
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options.secure = true;
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break;
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case 'direct:':
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options.direct = true;
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break;
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}
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if (!isNaN(url.port) && Number(url.port)) {
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options.port = Number(url.port);
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}
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if (url.hostname) {
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options.host = url.hostname;
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}
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if (url.auth) {
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auth = url.auth.split(':');
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if (!options.auth) {
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options.auth = {};
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}
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options.auth.user = auth.shift();
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options.auth.pass = auth.join(':');
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}
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Object.keys(url.query || {}).forEach(key => {
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let obj = options;
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let lKey = key;
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let value = url.query[key];
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if (!isNaN(value)) {
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value = Number(value);
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}
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switch (value) {
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case 'true':
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value = true;
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break;
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case 'false':
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value = false;
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break;
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}
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// tls is nested object
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if (key.indexOf('tls.') === 0) {
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lKey = key.substr(4);
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if (!options.tls) {
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options.tls = {};
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}
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obj = options.tls;
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} else if (key.indexOf('.') >= 0) {
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// ignore nested properties besides tls
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return;
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}
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if (!(lKey in obj)) {
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obj[lKey] = value;
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}
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});
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});
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return options;
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};
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module.exports._logFunc = (logger, level, defaults, data, message, ...args) => {
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let entry = {};
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Object.keys(defaults || {}).forEach(key => {
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if (key !== 'level') {
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entry[key] = defaults[key];
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}
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});
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Object.keys(data || {}).forEach(key => {
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if (key !== 'level') {
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entry[key] = data[key];
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}
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});
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logger[level](entry, message, ...args);
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};
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/**
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* Returns a bunyan-compatible logger interface. Uses either provided logger or
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* creates a default console logger
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*
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* @param {Object} [options] Options object that might include 'logger' value
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* @return {Object} bunyan compatible logger
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*/
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module.exports.getLogger = (options, defaults) => {
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options = options || {};
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let response = {};
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let levels = ['trace', 'debug', 'info', 'warn', 'error', 'fatal'];
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if (!options.logger) {
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// use vanity logger
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levels.forEach(level => {
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response[level] = () => false;
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});
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return response;
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}
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let logger = options.logger;
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if (options.logger === true) {
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// create console logger
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logger = createDefaultLogger(levels);
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}
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levels.forEach(level => {
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response[level] = (data, message, ...args) => {
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module.exports._logFunc(logger, level, defaults, data, message, ...args);
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};
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});
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return response;
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};
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/**
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* Wrapper for creating a callback that either resolves or rejects a promise
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* based on input
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*
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* @param {Function} resolve Function to run if callback is called
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* @param {Function} reject Function to run if callback ends with an error
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*/
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module.exports.callbackPromise = (resolve, reject) =>
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function() {
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let args = Array.from(arguments);
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let err = args.shift();
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if (err) {
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reject(err);
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} else {
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resolve(...args);
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}
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};
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/**
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* Resolves a String or a Buffer value for content value. Useful if the value
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* is a Stream or a file or an URL. If the value is a Stream, overwrites
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* the stream object with the resolved value (you can't stream a value twice).
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*
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* This is useful when you want to create a plugin that needs a content value,
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* for example the `html` or `text` value as a String or a Buffer but not as
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* a file path or an URL.
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*
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* @param {Object} data An object or an Array you want to resolve an element for
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* @param {String|Number} key Property name or an Array index
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* @param {Function} callback Callback function with (err, value)
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*/
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module.exports.resolveContent = (data, key, callback) => {
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let promise;
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if (!callback) {
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promise = new Promise((resolve, reject) => {
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callback = module.exports.callbackPromise(resolve, reject);
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});
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}
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let content = (data && data[key] && data[key].content) || data[key];
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let contentStream;
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let encoding = ((typeof data[key] === 'object' && data[key].encoding) || 'utf8')
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.toString()
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.toLowerCase()
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.replace(/[-_\s]/g, '');
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if (!content) {
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return callback(null, content);
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}
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if (typeof content === 'object') {
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if (typeof content.pipe === 'function') {
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return resolveStream(content, (err, value) => {
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if (err) {
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return callback(err);
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}
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// we can't stream twice the same content, so we need
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// to replace the stream object with the streaming result
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data[key] = value;
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callback(null, value);
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});
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} else if (/^https?:\/\//i.test(content.path || content.href)) {
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contentStream = fetch(content.path || content.href);
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return resolveStream(contentStream, callback);
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} else if (/^data:/i.test(content.path || content.href)) {
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let parts = (content.path || content.href).match(/^data:((?:[^;]*;)*(?:[^,]*)),(.*)$/i);
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if (!parts) {
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return callback(null, Buffer.from(0));
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}
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return callback(null, /\bbase64$/i.test(parts[1]) ? Buffer.from(parts[2], 'base64') : Buffer.from(decodeURIComponent(parts[2])));
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} else if (content.path) {
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return resolveStream(fs.createReadStream(content.path), callback);
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}
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}
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if (typeof data[key].content === 'string' && !['utf8', 'usascii', 'ascii'].includes(encoding)) {
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content = Buffer.from(data[key].content, encoding);
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}
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// default action, return as is
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setImmediate(() => callback(null, content));
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return promise;
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};
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/**
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* Copies properties from source objects to target objects
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*/
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module.exports.assign = function(/* target, ... sources */) {
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let args = Array.from(arguments);
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let target = args.shift() || {};
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args.forEach(source => {
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Object.keys(source || {}).forEach(key => {
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if (['tls', 'auth'].includes(key) && source[key] && typeof source[key] === 'object') {
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// tls and auth are special keys that need to be enumerated separately
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// other objects are passed as is
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if (!target[key]) {
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// ensure that target has this key
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target[key] = {};
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}
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Object.keys(source[key]).forEach(subKey => {
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target[key][subKey] = source[key][subKey];
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});
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} else {
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target[key] = source[key];
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}
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});
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});
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return target;
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};
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module.exports.encodeXText = str => {
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// ! 0x21
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// + 0x2B
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// = 0x3D
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// ~ 0x7E
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if (!/[^\x21-\x2A\x2C-\x3C\x3E-\x7E]/.test(str)) {
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return str;
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}
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let buf = Buffer.from(str);
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let result = '';
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for (let i = 0, len = buf.length; i < len; i++) {
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let c = buf[i];
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if (c < 0x21 || c > 0x7e || c === 0x2b || c === 0x3d) {
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result += '+' + (c < 0x10 ? '0' : '') + c.toString(16).toUpperCase();
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} else {
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result += String.fromCharCode(c);
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}
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}
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return result;
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};
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/**
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* Streams a stream value into a Buffer
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*
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* @param {Object} stream Readable stream
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* @param {Function} callback Callback function with (err, value)
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*/
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function resolveStream(stream, callback) {
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let responded = false;
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let chunks = [];
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let chunklen = 0;
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stream.on('error', err => {
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if (responded) {
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return;
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}
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responded = true;
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callback(err);
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});
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stream.on('readable', () => {
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let chunk;
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while ((chunk = stream.read()) !== null) {
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chunks.push(chunk);
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chunklen += chunk.length;
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}
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});
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stream.on('end', () => {
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if (responded) {
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return;
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}
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responded = true;
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let value;
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try {
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value = Buffer.concat(chunks, chunklen);
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} catch (E) {
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return callback(E);
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}
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callback(null, value);
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});
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}
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/**
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* Generates a bunyan-like logger that prints to console
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*
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* @returns {Object} Bunyan logger instance
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*/
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function createDefaultLogger(levels) {
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let levelMaxLen = 0;
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let levelNames = new Map();
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levels.forEach(level => {
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if (level.length > levelMaxLen) {
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levelMaxLen = level.length;
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}
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});
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levels.forEach(level => {
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let levelName = level.toUpperCase();
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if (levelName.length < levelMaxLen) {
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levelName += ' '.repeat(levelMaxLen - levelName.length);
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}
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levelNames.set(level, levelName);
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});
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let print = (level, entry, message, ...args) => {
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let prefix = '';
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if (entry) {
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if (entry.tnx === 'server') {
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prefix = 'S: ';
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} else if (entry.tnx === 'client') {
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prefix = 'C: ';
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}
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if (entry.sid) {
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prefix = '[' + entry.sid + '] ' + prefix;
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}
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if (entry.cid) {
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prefix = '[#' + entry.cid + '] ' + prefix;
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}
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}
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message = util.format(message, ...args);
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message.split(/\r?\n/).forEach(line => {
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console.log(
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'[%s] %s %s',
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new Date()
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.toISOString()
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.substr(0, 19)
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.replace(/T/, ' '),
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levelNames.get(level),
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prefix + line
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);
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});
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};
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let logger = {};
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levels.forEach(level => {
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logger[level] = print.bind(null, level);
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});
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return logger;
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}
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