dns: implement wildcard dns validation

src/dns/wildcard.js

@@ -0,0 +1,85 @@
+'use strict';
+
+exports = module.exports = {
+    upsert: upsert,
+    get: get,
+    del: del,
+    waitForDns: require('./waitfordns.js'),
+    verifyDnsConfig: verifyDnsConfig
+};
+
+var assert = require('assert'),
+    debug = require('debug')('box:dns/manual'),
+    dns = require('../native-dns.js'),
+    DomainsError = require('../domains.js').DomainsError,
+    sysinfo = require('../sysinfo.js'),
+    util = require('util');
+
+function upsert(dnsConfig, zoneName, subdomain, type, values, callback) {
+    assert.strictEqual(typeof dnsConfig, 'object');
+    assert.strictEqual(typeof zoneName, 'string');
+    assert.strictEqual(typeof subdomain, 'string');
+    assert.strictEqual(typeof type, 'string');
+    assert(util.isArray(values));
+    assert.strictEqual(typeof callback, 'function');
+
+    debug('upsert: %s for zone %s of type %s with values %j', subdomain, zoneName, type, values);
+
+    return callback(null);
+}
+
+function get(dnsConfig, zoneName, subdomain, type, callback) {
+    assert.strictEqual(typeof dnsConfig, 'object');
+    assert.strictEqual(typeof zoneName, 'string');
+    assert.strictEqual(typeof subdomain, 'string');
+    assert.strictEqual(typeof type, 'string');
+    assert.strictEqual(typeof callback, 'function');
+
+    callback(null, [ ]); // returning ip confuses apptask into thinking the entry already exists
+}
+
+function del(dnsConfig, zoneName, subdomain, type, values, callback) {
+    assert.strictEqual(typeof dnsConfig, 'object');
+    assert.strictEqual(typeof zoneName, 'string');
+    assert.strictEqual(typeof subdomain, 'string');
+    assert.strictEqual(typeof type, 'string');
+    assert(util.isArray(values));
+    assert.strictEqual(typeof callback, 'function');
+
+    return callback();
+}
+
+function verifyDnsConfig(dnsConfig, domain, zoneName, ip, callback) {
+    assert.strictEqual(typeof dnsConfig, 'object');
+    assert.strictEqual(typeof domain, 'string');
+    assert.strictEqual(typeof zoneName, 'string');
+    assert.strictEqual(typeof ip, 'string');
+    assert.strictEqual(typeof callback, 'function');
+
+    if ('hyphenatedSubdomains' in dnsConfig && typeof dnsConfig.hyphenatedSubdomains !== 'boolean') return callback(new DomainsError(DomainsError.BAD_FIELD, 'hyphenatedSubdomains must be a boolean'));
+
+    var config = {
+        hyphenatedSubdomains: !!dnsConfig.hyphenatedSubdomains
+    };
+
+    // Very basic check if the nameservers can be fetched
+    dns.resolve(zoneName, 'NS', { timeout: 5000 }, function (error, nameservers) {
+        if (error && error.code === 'ENOTFOUND') return callback(new DomainsError(DomainsError.BAD_FIELD, 'Unable to resolve nameservers for this domain'));
+        if (error || !nameservers) return callback(new DomainsError(DomainsError.BAD_FIELD, error ? error.message : 'Unable to get nameservers'));
+
+        const separator = config.hyphenatedSubdomains ? '-' : '.';
+        const fqdn = `cloudrontest${separator}${domain}`;
+        dns.resolve(fqdn, 'A', { server: '127.0.0.1', timeout: 5000 }, function (error, result) {
+            if (error && error.code === 'ENOTFOUND') return callback(new DomainsError(DomainsError.BAD_FIELD, `Unable to resolve ${fqdn}`));
+            if (error || !result) return callback(new DomainsError(DomainsError.BAD_FIELD, error ? error.message : `Unable to resolve ${fqdn}`));
+
+            sysinfo.getPublicIp(function (error, ip) {
+                if (error) return callback(new DomainsError(DomainsError.EXTERNAL_ERROR, `Failed to detect IP of this server: ${error.message}`));
+
+                if (result.length !== 1 || ip !== result[0]) return callback(new DomainsError(DomainsError.EXTERNAL_ERROR, `Domain resolves to ${JSON.stringify(result)} instead of ${ip}`));
+
+                callback(null, config);
+            });
+        });
+    });
+}