added asynch authorizers

Author: Leon Strauss

index.js

@@ -5,6 +5,7 @@ function buildMiddleware(options) {
     var challenge = options.challenge != undefined ? !!options.challenge : true;
     var users = options.users || {};
     var authorizer = options.authorizer || staticUsersAuthorizer;
+    var isAsync = options.authorizeAsync != undefined ? !!options.authorizeAsync : false;
 
     assert(typeof users == 'object', 'Expected an object for the basic auth users, found ' + typeof users + ' instead');
     assert(typeof authorizer == 'function', 'Expected a function for the basic auth authorizer, found ' + typeof authorizer + ' instead');
@@ -20,7 +21,22 @@ function buildMiddleware(options) {
     return function authMiddleware(req, res, next) {
         var authentication = auth(req);
 
-        if(!authentication || !authorizer(authentication.name, authentication.pass)) {
+        if(!authentication)
+            return unauthorized();
+
+        if(isAsync)
+            return authorizer(authentication.name, authentication.pass, authorizerCallback);
+        else if(!authorizer(authentication.name, authentication.pass))
+            return unauthorized();
+
+        req.auth = {
+            user: authentication.name,
+            password: authentication.pass
+        };
+
+        next();
+
+        function unauthorized() {
             res.status(401);
 
             if(challenge)
@@ -29,12 +45,14 @@ function buildMiddleware(options) {
             return res.send('');
         }
 
-        req.auth = {
-            user: authentication.name,
-            password: authentication.pass
-        };
+        function authorizerCallback(err, approved) {
+            assert.ifError(err);
 
-        next();
+            if(approved)
+                return next();
+
+            return unauthorized();
+        }
     };
 }