First commit

framework/client/fileLoader.js

@@ -0,0 +1,75 @@
+/*
+
+	Copyright (c) 2020, 2023, The Unified Company.
+
+	This code is part of Unify.
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE,
+	as published by the Free Software Foundation.
+	See the GNU AFFERO GENERAL PUBLIC LICENSE, for more details.
+
+	https://unifyjs.org 
+
+*/
+
+export default class fileLoader{
+
+	files		= new Array();
+
+	filesExists	= new Array();
+
+	async get( url ) {
+
+		return await this.getFile( url );
+
+	}
+
+	exists( url )
+	{
+
+		if( this.filesExists[ url ] ) {
+
+			return this.filesExists[ url ];
+
+		}
+
+		var http = new XMLHttpRequest();
+
+		http.open('HEAD', url, false);
+
+		http.send();
+
+		this.filesExists[ url ]	= http.status != 404;
+
+		return http.status != 404;
+
+	}
+
+	async getFile( url ) {
+
+		if( this.files[ url ] ) {
+
+			return this.files[ url ];
+
+		} else {
+
+			var response 	= await fetch( url );
+
+			var json 		= await response.json();
+
+			this.addFile( url, json );
+
+			return json;
+
+		}
+
+	}
+
+	addFile( url, json ) {
+
+		this.files[ url ] = json;
+
+	}
+	
+}