Dont create multiple access tokens when one has not expired yet for e…

src/OAuth2/ResponseType/AccessToken.php

@@ -100,7 +100,14 @@ public function createAccessToken($client_id, $user_id, $scope = null, $includeR
             "scope" => $scope
         );
 
-        $this->tokenStorage->setAccessToken($token["access_token"], $client_id, $user_id, $this->config['access_lifetime'] ? time() + $this->config['access_lifetime'] : null, $scope);
+        $response = $this->tokenStorage->setAccessToken($token["access_token"], $client_id, $user_id, $this->config['access_lifetime'] ? time() + $this->config['access_lifetime'] : null, $scope);
+
+        //update token to the existing one for efficiency purposes
+        if(is_object($response)){
+            $token['access_token'] = $response->access_token;
+            $token['expires_in'] = $response->expires;
+            $token['scope'] = $response->scope;
+        }
 
         /*
          * Issue a refresh token also, if we support them

src/OAuth2/Storage/MongoDB.php

@@ -129,6 +129,13 @@ public function getAccessToken($access_token)
 
     public function setAccessToken($access_token, $client_id, $user_id, $expires, $scope = null)
     {
+
+        //Dont create multiple access tokens when one has not expired yet for efficient purposes and security. Included this to avoid too much of new tokens when one has not expired - Also updated OAuth2\ResponseType\AccessToken to use the existing token that has not expired instead of creating a new one
+        $result = $this->collection('access_token_table')->findOne(array('client_id' => $client_id, 'expires' => ['$gt' => time()]));
+        if(!is_null($result)){
+            return $result;
+        }
+
         // if it exists, update it.
         if ($this->getAccessToken($access_token)) {
             $result = $this->collection('access_token_table')->updateOne(