Pass metadata to request token store on get.

lib/strategy.js

@@ -143,7 +143,8 @@ OAuthStrategy.prototype.authenticate = function(req, options) {
     // fetch profile information from the service provider, is sufficient to
     // establish the identity of the user.
     var oauthToken = req.query.oauth_token;
-    this._requestTokenStore.get(req, oauthToken, function(err, oauthTokenSecret) {
+
+    function loaded(err, oauthTokenSecret) {
       if (err) { return self.error(err); }
 
       // NOTE: The oauth_verifier parameter will be supplied in the query portion
@@ -190,7 +191,18 @@ OAuthStrategy.prototype.authenticate = function(req, options) {
           });
         });
       });
-    });
+    }
+
+    try {
+      var arity = self._requestTokenStore.get.length;
+      if (arity == 4) {
+        this._requestTokenStore.get(req, oauthToken, meta, loaded);
+      } else { // arity == 3
+        this._requestTokenStore.get(req, oauthToken, loaded);
+      }
+    } catch (ex) {
+      return this.error(ex);
+    }
   } else {
     // In order to authenticate via OAuth, the application must obtain a request
     // token from the service provider and redirect the user to the service