initial commit

.prettierrc

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+{
+  "bracketSpacing": true,
+  "printWidth": 80,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "trailingComma": "none",
+  "useTabs": true
+}

README.md

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+# [acme-dns-01-duckdns](https://git.rootprojects.org/root/acme-dns-01-duckdns) | a [Root](https://rootrpojects.org) project
+
+DuckDNS for Let's Encrypt / ACME dns-01 challenges with ACME.js and Greenlock.js (Node.js).
+
+# Tests
+
+```
+# node ./test.js domain-zone api-token
+node ./test.js example.com xxxxxx
+```

index.js

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+'use strict';
+
+module.exports = require('./lib/index.js');

lib/index.js

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+'use strict';
+
+var request = require('@root/request');
+request = require('util').promisify(request);
+
+var dns = require('dns');
+
+module.exports.create = function(config) {
+	// config = { baseUrl, token, apiTimeout }
+	var baseUrl = config.baseUrl || 'https://www.duckdns.org';
+	var authtoken = config.token;
+	var apiTimeout = config.apiTimeout || 5000;
+	// return object containing get/set/remove functions
+	return {
+		set: function(data) {
+			var domain_name = data.challenge.identifier.value;
+			var txt = data.challenge.dnsAuthorization;
+			var url =
+				baseUrl +
+				'/update?domains=' +
+				domain_name +
+				'&token=' +
+				authtoken +
+				'&txt=' +
+				txt;
+
+			// console.log("adding txt", data);
+			return request({
+				method: 'GET',
+				url: url
+			}).then(function(resp) {
+				if (resp === 'OK') {
+					return true;
+				}
+				throw new Error('record did not set. check subdomain, api key, etc');
+			});
+		},
+		remove: function(data) {
+			var domain_name = data.challenge.identifier.value;
+			var txt = data.challenge.dnsAuthorization;
+			var url =
+				baseUrl +
+				'/update?domains=' +
+				domain_name +
+				'&token=' +
+				authtoken +
+				'&txt=' +
+				txt +
+				'&clear=true';
+
+			// console.log("removing txt");
+			return request({
+				method: 'GET',
+				url: url
+			}).then(function(resp) {
+				if (resp === 'OK') {
+					return true;
+				}
+				throw new Error('Couldnt remove record. check subdomain, api key, etc');
+			});
+		},
+		get: function(data) {
+			// the duckdns doesnt provide an API to fetch DNS records so we are using Node DNS library to get TXT record.
+			// We need to add manual delay as the DNS records do not get updated instantly.
+			var domain_name = data.challenge.identifier.value;
+			return delay(apiTimeout).then(function() {
+				console.log('fetching txt', data);
+				return new Promise(function(resolve, reject) {
+					dns.resolveTxt(domain_name, (err, txt) => {
+						if (err) {
+							console.error(err);
+							reject(null);
+						}
+						// console.log(txt);
+						if (txt && txt[0] && txt[0][0])
+							resolve({ dnsAuthorization: txt[0][0] });
+						else resolve(null);
+					});
+				});
+			});
+		}
+	};
+};
+
+function delay(ms) {
+	return new Promise(resolve => setTimeout(resolve, ms));
+}

package.json

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+{
+	"name": "acme-dns-01-duckdns",
+	"version": "3.0.0",
+	"description": "DuckDNS for Let's Encrypt / ACME dns-01 challenges with ACME.js and Greenlock.js",
+	"main": "index.js",
+	"scripts": {
+		"test": "node ./test.js"
+	},
+	"repository": {
+		"type": "git",
+		"url": "https://git.rootprojects.org/root/acme-dns-01-duckdns.git"
+	},
+	"keywords": [
+		"duckdns",
+		"duck",
+		"dns",
+		"dns-01",
+		"letsencrypt",
+		"acme",
+		"greenlock"
+	],
+	"author": "AJ ONeal <coolaj86@gmail.com> (https://coolaj86.com/)",
+	"license": "MPL-2.0",
+	"dependencies": {
+		"@root/request": "^1.3.11"
+	},
+	"devDependencies": {
+		"acme-challenge-test": "^3.1.0"
+	}
+}

test.js

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+#!/usr/bin/env node
+'use strict';
+
+// See https://git.coolaj86.com/coolaj86/acme-challenge-test.js
+var tester = require('acme-challenge-test');
+
+// Usage: node ./test.js example.com xxxxxxxxx
+var zone = process.argv[2];
+var challenger = require('./index.js').create({
+	token: process.argv[3]
+});
+
+// The dry-run tests can pass on, literally, 'example.com'
+// but the integration tests require that you have control over the domain
+tester
+	.testZone('dns-01', zone, challenger)
+	.then(function() {
+		console.info('PASS', zone);
+	})
+	.catch(function(e) {
+		console.error(e.message);
+		console.error(e.stack);
+	});