handlers: permisison check for all pages + retrieve user-specific permissions for pages (if any)

handlers/handlercategory.cpp

@@ -20,7 +20,7 @@ SOFTWARE.
 */
 #include "handlercategory.h"
 
-Response HandlerCategory::handle(const Request &r)
+Response HandlerCategory::handleRequest(const Request &r)
 {
 	try
 	{
@@ -48,3 +48,13 @@ Response HandlerCategory::handle(const Request &r)
 		return errorResponse("Error", "An unknown error occured");
 	}
 }
+
+std::string HandlerCategory::accessErrorMessage()
+{
+	return "You don't have permission to view categories";
+}
+
+bool HandlerCategory::canAccess(const Permissions &perms)
+{
+	return perms.canRead(); // TODO: we may need a more specific permission
+}