Registration action is handled and create a user

See https://github.com/FreshRSS/FreshRSS/issues/679

app/Controllers/userController.php

@@ -12,9 +12,14 @@ class FreshRSS_user_Controller extends Minz_ActionController {
 	 * This action is called before every other action in that class. It is
 	 * the common boiler plate for every action. It is triggered by the
 	 * underlying framework.
+	 *
+	 * @todo clean up the access condition.
 	 */
 	public function firstAction() {
-		if (!FreshRSS_Auth::hasAccess()) {
+		if (!FreshRSS_Auth::hasAccess() && !(
+				Minz_Request::actionName() === 'create' &&
+				!max_registrations_reached()
+		)) {
 			Minz_Error::error(403);
 		}
 	}
@@ -111,11 +116,16 @@ class FreshRSS_user_Controller extends Minz_ActionController {
 	 *   - new_user_name
 	 *   - new_user_passwordPlain
 	 *   - new_user_email
+	 *   - r (i.e. a redirection url, optional)
 	 *
 	 * @todo clean up this method. Idea: write a method to init a user with basic information.
+	 * @todo handle r redirection in Minz_Request::forward directly?
 	 */
 	public function createAction() {
-		if (Minz_Request::isPost() && FreshRSS_Auth::hasAccess('admin')) {
+		if (Minz_Request::isPost() && (
+				FreshRSS_Auth::hasAccess('admin') ||
+				!max_registrations_reached()
+		)) {
 			$db = FreshRSS_Context::$system_conf->db;
 			require_once(APP_PATH . '/SQL/install.sql.' . $db['type'] . '.php');
 
@@ -186,7 +196,11 @@ class FreshRSS_user_Controller extends Minz_ActionController {
 			Minz_Session::_param('notification', $notif);
 		}
 
-		Minz_Request::forward(array('c' => 'user', 'a' => 'manage'), true);
+		$redirect_url = urldecode(Minz_Request::param('r', false, true));
+		if (!$redirect_url) {
+			$redirect_url = array('c' => 'user', 'a' => 'manage');
+		}
+		Minz_Request::forward($redirect_url, true);
 	}
 
 	/**

app/views/auth/register.phtml

@@ -29,6 +29,13 @@
         </div>
 
         <div>
+            <?php
+                $redirect_url = urlencode(Minz_Url::display(
+                    array('c' => 'index', 'a' => 'index'),
+                    'php', true
+                ));
+            ?>
+            <input type="hidden" name="r" value="<?php echo $redirect_url; ?>" />
             <button type="submit" class="btn btn-important"><?php echo _t('gen.action.create'); ?></button>
             <a class="btn" href="<?php echo _url('index', 'index'); ?>"><?php echo _t('gen.action.cancel'); ?></a>
         </div>

lib/lib_rss.php

@@ -266,6 +266,22 @@ function listUsers() {
 }
 
 
+/**
+ * Return if the maximum number of registrations has been reached.
+ *
+ * Note a max_regstrations of 0 means there is no limit.
+ *
+ * @return true if number of users >= max registrations, false else.
+ */
+function max_registrations_reached() {
+	$system_conf = Minz_Configuration::get('system');
+	$limit_registrations = $system_conf->limits['max_registrations'];
+	$number_accounts = count(listUsers());
+
+	return $limit_registrations > 0 && $number_accounts >= $limit_registrations;
+}
+
+
 /**
  * Register and return the configuration for a given user.
  *