update for upcoming v3

lib/middleware.js

@@ -49,20 +49,46 @@ module.exports.create = function (gl) {
 
       var copy = utils.merge({ domains: [ hostname ] }, gl);
       copy = utils.tplCopy(copy);
+      copy.challenge = {};
+      copy.challenge.type = 'http-01'; // obviously...
+      copy.challenge.identifier = { type: 'dns', value: hostname };
+      copy.challenge.wildcard = false;
+      copy.challenge.token = token;
+      copy.challenge.altname = hostname;
 
-      // TODO tpl copy?
-      // TODO need to restore challengeType
-      gl.challenges['http-01'].get(copy, hostname, token, function (err, secret) {
-        if (err || !token) {
+      function cb(opts) {
+        var secret = opts.keyAuthorization || opts;
+        if (secret && 'string' === typeof secret) {
+          res.setHeader('Content-Type', 'text/plain; charset=utf-8');
+          res.end(secret);
+          return;
+        }
+        eb(new Error("couldn't retrieve keyAuthorization"));
+        return;
+      }
+      function eb(/*err*/) {
         res.statusCode = 404;
         res.setHeader('Content-Type', 'application/json; charset=utf-8');
         res.end('{ "error": { "message": "Error: These aren\'t the tokens you\'re looking for. Move along." } }');
         return;
       }
+      function mb(err, result) {
+        if (err) { eb(err); return; }
+        cb(result);
+      }
+
+      var challenger = gl.challenges['http-01'].get;
+      if (1 === challenger.length) {
+        /*global Promise*/
+        return Promise.resolve().then(function () {
+          return gl.challenges['http-01'].get(copy);
+        }).then(cb).catch(eb);
+      } else if (2 === challenger.length) {
+        gl.challenges['http-01'].get(copy, mb);
+      } else {
+        gl.challenges['http-01'].get(copy, hostname, token, mb);
+      }
 
-        res.setHeader('Content-Type', 'text/plain; charset=utf-8');
-        res.end(secret);
-      });
     };
   };
 };