add interactive dns test

index.js

@@ -0,0 +1,76 @@
+'use strict';
+
+var PromiseA = require('bluebird');
+var dns = PromiseA.promisifyAll(require('dns'));
+var Challenge = module.exports;
+
+Challenge.create = function (defaults) {
+  return  {
+    getOptions: function () {
+      return defaults || {};
+    }
+  , set: Challenge.set
+  , get: Challenge.get
+  , remove: Challenge.remove
+  , loopback: Challenge.loopback
+  , test: Challenge.test
+  };
+};
+
+// Show the user the token and key and wait for them to be ready to continue
+Challenge.set = function (args, domain, challenge, keyAuthorization, cb) {
+  var keyAuthDigest = require('crypto').createHash('sha256').update(keyAuthorization||'').digest('base64')
+    .replace(/\+/g, '-')
+    .replace(/\//g, '_')
+    .replace(/=+$/g, '')
+    ;
+  var challengeDomain = (args.test || '') + args.acmeChallengeDns + domain;
+
+  console.info("");
+  console.info("Challenge for '" + domain + "'");
+  console.info("");
+  console.info("We now present (for you copy-and-paste pleasure) your ACME Challenge");
+  console.info("public Challenge and secret KeyAuthorization and Digest, in that order, respectively:");
+  console.info(challenge);
+  console.info(keyAuthorization);
+  console.info(keyAuthDigest);
+  console.info("");
+  console.info(challengeDomain + "\tTXT " + keyAuthDigest + "\tTTL 60");
+  console.info("");
+  console.info(JSON.stringify({
+    domain: domain
+  , challenge: challenge
+  , keyAuthorization: keyAuthorization
+  , keyAuthDigest: keyAuthDigest
+  }, null, '  ').replace(/^/gm, '\t'));
+  console.info("");
+  console.info("hit enter to continue...");
+  process.stdin.resume();
+  process.stdin.on('data', function () {
+    process.stdin.pause();
+    cb(null);
+  });
+};
+
+// nothing to do here, that's why it's manual
+Challenge.get = function (defaults, domain, challenge, cb) {
+  cb(null);
+};
+
+// might as well tell the user that whatever they were setting up has been checked
+Challenge.remove = function (args, domain, challenge, cb) {
+  console.info("Challenge for '" + domain + "' complete. You may remove it.");
+  console.info("");
+  //console.info("hit enter to continue...");
+  //process.stdin.resume();
+  //process.stdin.on('data', function () {
+  //  process.stdin.pause();
+    cb(null);
+  //});
+};
+
+Challenge.loopback = function (defaults, domain, challenge, done) {
+  var challengeDomain = (defaults.test || '') + defaults.acmeChallengeDns + domain;
+  console.log("dig TXT +noall +answer @8.8.8.8 '" + challengeDomain + "' # " + challenge);
+  dns.resolveTxtAsync(challengeDomain).then(function (x) { done(null, x); }, done);
+};