Move dns backends to separate directory

src/dns/route53.js

@@ -0,0 +1,193 @@
+/* jslint node:true */
+
+'use strict';
+
+exports = module.exports = {
+    addSubdomain: addSubdomain,
+    delSubdomain: delSubdomain,
+    getChangeStatus: getChangeStatus
+};
+
+var assert = require('assert'),
+    AWS = require('aws-sdk'),
+    config = require('../config.js'),
+    debug = require('debug')('box:dns/route53'),
+    settings = require('../settings.js'),
+    SubdomainError = require('../subdomainerror.js');
+
+function getDnsCredentials(callback) {
+    assert.strictEqual(typeof callback, 'function');
+
+    settings.getDnsConfig(function (error, dnsConfig) {
+        if (error) return callback(new SubdomainError(SubdomainError.INTERNAL_ERROR, error));
+
+        var credentials = {
+            accessKeyId: dnsConfig.accessKeyId,
+            secretAccessKey: dnsConfig.secretAccessKey,
+            region: dnsConfig.region
+        };
+
+        if (dnsConfig.endpoint) credentials.endpoint = new AWS.Endpoint(dnsConfig.endpoint);
+
+        callback(null, credentials);
+    });
+}
+
+function getZoneByName(zoneName, callback) {
+    assert.strictEqual(typeof zoneName, 'string');
+    assert.strictEqual(typeof callback, 'function');
+
+    debug('getZoneByName: %s', zoneName);
+
+    getDnsCredentials(function (error, credentials) {
+        if (error) return callback(error);
+
+        var route53 = new AWS.Route53(credentials);
+        route53.listHostedZones({}, function (error, result) {
+            if (error) return callback(new SubdomainError(SubdomainError.EXTERNAL_ERROR, new Error(error)));
+
+            var zone = result.HostedZones.filter(function (zone) {
+                return zone.Name.slice(0, -1) === zoneName;     // aws zone name contains a '.' at the end
+            })[0];
+
+            if (!zone) return callback(new SubdomainError(SubdomainError.NOT_FOUND, 'no such zone'));
+
+            debug('getZoneByName: found zone', zone);
+
+            callback(null, zone);
+        });
+    });
+}
+
+function addSubdomain(zoneName, subdomain, type, value, callback) {
+    assert.strictEqual(typeof zoneName, 'string');
+    assert.strictEqual(typeof subdomain, 'string');
+    assert.strictEqual(typeof type, 'string');
+    assert.strictEqual(typeof value, 'string');
+    assert.strictEqual(typeof callback, 'function');
+
+    debug('addSubdomain: ' + subdomain + ' for domain ' + zoneName + ' with value ' + value);
+
+    getZoneByName(zoneName, function (error, zone) {
+        if (error) return callback(error);
+
+        var fqdn = config.appFqdn(subdomain);
+        var params = {
+            ChangeBatch: {
+                Changes: [{
+                    Action: 'UPSERT',
+                    ResourceRecordSet: {
+                        Type: type,
+                        Name: fqdn,
+                        ResourceRecords: [{
+                            Value: value
+                        }],
+                        Weight: 0,
+                        SetIdentifier: fqdn,
+                        TTL: 1
+                    }
+                }]
+            },
+            HostedZoneId: zone.Id
+        };
+
+        getDnsCredentials(function (error, credentials) {
+            if (error) return callback(error);
+
+            var route53 = new AWS.Route53(credentials);
+            route53.changeResourceRecordSets(params, function(error, result) {
+                if (error && error.code === 'PriorRequestNotComplete') {
+                    return callback(new SubdomainError(SubdomainError.STILL_BUSY, error.message));
+                } else if (error) {
+                    return callback(new SubdomainError(SubdomainError.EXTERNAL_ERROR, error.message));
+                }
+
+                debug('addSubdomain: success. changeInfoId:%j', result);
+
+                callback(null, result.ChangeInfo.Id);
+            });
+        });
+    });
+}
+
+function delSubdomain(zoneName, subdomain, type, value, callback) {
+    assert.strictEqual(typeof zoneName, 'string');
+    assert.strictEqual(typeof subdomain, 'string');
+    assert.strictEqual(typeof type, 'string');
+    assert.strictEqual(typeof value, 'string');
+    assert.strictEqual(typeof callback, 'function');
+
+    debug('delSubdomain: %s for domain %s.', subdomain, zoneName);
+
+    getZoneByName(zoneName, function (error, zone) {
+        if (error) return callback(error);
+
+        var fqdn = config.appFqdn(subdomain);
+        var resourceRecordSet = {
+            Name: fqdn,
+            Type: type,
+            ResourceRecords: [{
+                Value: value
+            }],
+            Weight: 0,
+            SetIdentifier: fqdn,
+            TTL: 1
+        };
+
+        var params = {
+            ChangeBatch: {
+                Changes: [{
+                    Action: 'DELETE',
+                    ResourceRecordSet: resourceRecordSet
+                }]
+            },
+            HostedZoneId: zone.Id
+        };
+
+        getDnsCredentials(function (error, credentials) {
+            if (error) return callback(error);
+
+            var route53 = new AWS.Route53(credentials);
+            route53.changeResourceRecordSets(params, function(error, result) {
+                if (error && error.message && error.message.indexOf('it was not found') !== -1) {
+                    debug('delSubdomain: resource record set not found.', error);
+                    return callback(new SubdomainError(SubdomainError.NOT_FOUND, new Error(error)));
+                } else if (error && error.code === 'NoSuchHostedZone') {
+                    debug('delSubdomain: hosted zone not found.', error);
+                    return callback(new SubdomainError(SubdomainError.NOT_FOUND, new Error(error)));
+                } else if (error && error.code === 'PriorRequestNotComplete') {
+                    debug('delSubdomain: resource is still busy', error);
+                    return callback(new SubdomainError(SubdomainError.STILL_BUSY, new Error(error)));
+                } else if (error && error.code === 'InvalidChangeBatch') {
+                    debug('delSubdomain: invalid change batch. No such record to be deleted.');
+                    return callback(new SubdomainError(SubdomainError.NOT_FOUND, new Error(error)));
+                } else if (error) {
+                    debug('delSubdomain: error', error);
+                    return callback(new SubdomainError(SubdomainError.EXTERNAL_ERROR, new Error(error)));
+                }
+
+                debug('delSubdomain: success');
+
+                callback(null);
+            });
+        });
+    });
+}
+
+function getChangeStatus(changeId, callback) {
+    assert.strictEqual(typeof changeId, 'string');
+    assert.strictEqual(typeof callback, 'function');
+
+    if (changeId === '') return callback(null, 'INSYNC');
+
+    getDnsCredentials(function (error, credentials) {
+        if (error) return callback(error);
+
+        var route53 = new AWS.Route53(credentials);
+        route53.getChange({ Id: changeId }, function (error, result) {
+            if (error) return callback(error);
+
+            callback(null, result.ChangeInfo.Status);
+        });
+    });
+}