Add API calls to manage tags

app/Api/Authorization/ProjectAuthorization.php

@@ -23,13 +23,13 @@ class ProjectAuthorization extends Base
     protected function checkProjectPermission($class, $method, $project_id)
     {
         if (empty($project_id)) {
-            throw new AccessDeniedException('Project not found');
+            throw new AccessDeniedException('Project Not Found');
         }
         
         $role = $this->projectUserRoleModel->getUserRole($project_id, $this->userSession->getId());
 
         if (! $this->apiProjectAuthorization->isAllowed($class, $method, $role)) {
-            throw new AccessDeniedException('Project access denied');
+            throw new AccessDeniedException('Project Access Denied');
         }
     }
 }

app/Api/Authorization/TagAuthorization.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Kanboard\Api\Authorization;
+
+/**
+ * Class TagAuthorization
+ *
+ * @package Kanboard\Api\Authorization
+ * @author  Frederic Guillot
+ */
+class TagAuthorization extends ProjectAuthorization
+{
+    public function check($class, $method, $tag_id)
+    {
+        if ($this->userSession->isLogged()) {
+            $tag = $this->tagModel->getById($tag_id);
+
+            if (! empty($tag)) {
+                $this->checkProjectPermission($class, $method, $tag['project_id']);
+            }
+        }
+    }
+}

app/Api/Authorization/TaskAuthorization.php

@@ -10,10 +10,10 @@ namespace Kanboard\Api\Authorization;
  */
 class TaskAuthorization extends ProjectAuthorization
 {
-    public function check($class, $method, $category_id)
+    public function check($class, $method, $task_id)
     {
         if ($this->userSession->isLogged()) {
-            $this->checkProjectPermission($class, $method, $this->taskFinderModel->getProjectId($category_id));
+            $this->checkProjectPermission($class, $method, $this->taskFinderModel->getProjectId($task_id));
         }
     }
 }