add license, move folders

app/scripts/url.gd

@@ -0,0 +1,29 @@
+extends RefCounted
+class_name Url
+
+const url_regex: String = "^(https?)://[^\\s()<>]+(?:\\([\\w\\d]+\\)|([^[:punct:]\\s]|/))$"
+
+
+static func join(base_url: String, path: String) -> String:
+	var url = ""
+	if path.is_empty():
+		url = base_url
+	elif path.begins_with("http"):
+		url = path
+	else:
+		url = base_url.get_base_dir() + "/" + path
+	return url
+
+
+static func fix_gate_url(url: String) -> String:
+	if url.get_extension() != "gate":
+		var slash = "" if url.ends_with("/") else "/"
+		url += slash + "world.gate"
+	return url
+
+
+static func is_valid(url: String) -> bool:
+	var regex = RegEx.new()
+	regex.compile(url_regex)
+	var result = regex.search(url)
+	return false if result == null else result.get_string() == url