Fix refresh token in demo page

Author: diazmartin

index.php

@@ -169,20 +169,29 @@
 
                     if($_GET['code'] && $_GET['publish_item']) {
 
-                        // If the code was in get parameter we authorize
-                        $user = $meli->authorize($_GET['code'], $redirectURI);
+                        // If code exist and session is empty
+                        if($_GET['code'] && !($_SESSION['access_token'])) {
+                            // If the code was in get parameter we authorize
+                            $user = $meli->authorize($_GET['code'], $redirectURI);
 
-                        // Now we create the sessions with the authenticated user
-                        $_SESSION['access_token'] = $user['body']->access_token;
-                        $_SESSION['expires_in'] = $user['body']->expires_in;
-                        $_SESSION['refresh_token'] = $user['body']->refresh_token;
+                            // Now we create the sessions with the authenticated user
+                            $_SESSION['access_token'] = $user['body']->access_token;
+                            $_SESSION['expires_in'] = time() + $user['body']->expires_in;
+                            $_SESSION['refresh_token'] = $user['body']->refresh_token;
+                        } else {
+                            // We can check if the access token in invalid checking the time
+                            if($_SESSION['expires_in'] < time()) {
+                                try {
+                                    // Make the refresh proccess
+                                    $refresh = $meli->refreshAccessToken();
 
-                        // We can check if the access token in invalid checking the time
-                        if($_SESSION['expires_in'] + time() + 1 < time()) {
-                            try {
-                                print_r($meli->refreshAccessToken());
-                            } catch (Exception $e) {
-                                echo "Exception: ",  $e->getMessage(), "\n";
+                                    // Now we create the sessions with the new parameters
+                                    $_SESSION['access_token'] = $refresh['body']->access_token;
+                                    $_SESSION['expires_in'] = time() + $refresh['body']->expires_in;
+                                    $_SESSION['refresh_token'] = $refresh['body']->refresh_token;
+                                } catch (Exception $e) {
+                                    echo "Exception: ",  $e->getMessage(), "\n";
+                                }
                             }
                         }