Add tests for domain parser

packages/util/src/tests/url.unit.test.ts

@@ -0,0 +1,63 @@
+// Copyright 2021-2024 Prosopo (UK) Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+import { describe, expect, it } from "vitest";
+import { validateDomain } from "../url.js";
+
+describe("url", () => {
+	it("validates valid domains", () => {
+		const domains = [
+			"google.com",
+			"www.google.com",
+			"www.google.co.uk",
+			"www.google.co",
+			"google.co",
+			"google.co.uk",
+			"www.google.com.au",
+			"prosopo.io",
+			"averylongdomainnamethatnobodywouldeverremember.com",
+		];
+		domains.map((domain) => {
+			expect(validateDomain(domain)).to.equal(true);
+		});
+	});
+	it("does not validate an email address", () => {
+		expect(validateDomain("[email protected]")).to.equal(false);
+	});
+	it("does not validate a domain ending in a dot", () => {
+		expect(validateDomain("google.")).to.equal(false);
+	});
+	it("does not validate a domain containing an @", () => {
+		expect(validateDomain("goo@gle")).to.equal(false);
+	});
+	it("does not validate a domain with a leading dot", () => {
+		expect(validateDomain(".google.com")).to.equal(false);
+	});
+	it("validates a very long domain name", () => {
+		// 253 characters is the maximum length of full domain name, including dots: e.g. www.example.com = 15 characters.
+		//
+		// 63 characters in the maximum length of a "label" (part of domain name separated by dot). Labels for www.example.com are com, example and www.
+		expect(
+			validateDomain(
+				`${"a".repeat(62)}.${"a".repeat(62)}.${"a".repeat(62)}.${"a".repeat(61)}.co`,
+			),
+		).to.equal(true);
+	});
+	it("does not validate a domain name that is too long", () => {
+		expect(
+			validateDomain(
+				`${"a".repeat(62)}.${"a".repeat(62)}.${"a".repeat(62)}.${"a".repeat(62)}.co`,
+			),
+		).to.equal(false);
+	});
+});

packages/util/src/url.ts

@@ -18,16 +18,24 @@ export const getURLProtocol = (url: URL) => {
 	return "https";
 };
 
-export const parseUrl = (domain: string) =>
-	new URL(`https://${domain.replace(/^https?:\/\//, "")}`);
+export const parseUrl = (domain: string) => {
+	//check the url is not an email address
+	if (domain.match(/@/)) {
+		throw new Error("Invalid domain");
+	}
+
+	return new URL(`https://${domain.replace(/^https?:\/\//, "")}`);
+};
 
 export const validateDomain = (domain: string): boolean => {
-	if (domain.length > 253) return false;
+	if (domain.length > 253) {
+		return false;
+	}
 
 	// https://stackoverflow.com/a/57129472/1178971
 	if (
 		!domain.match(
-			/^(?!.*?_.*?)(?!(?:[\d\w]+?\.)?\-[\w\d\.\-]*?)(?![\w\d]+?\-\.(?:[\d\w\.\-]+?))(?=[\w\d])(?=[\w\d\.\-]*?\.+[\w\d\.\-]*?)(?![\w\d\.\-]{254})(?!(?:\.?[\w\d\-\.]*?[\w\d\-]{64,}\.)+?)[\w\d\.\-]+?(?<![\w\d\-\.]*?\.[\d]+?)(?<=[\w\d\-]{2,})(?<![\w\d\-]{25})$/,
+			/^\s*(?!.*?_.*?)(?!(?:[\d\w]+?\.)?\-[\w\d\.\-]*?)(?![\w\d]+?\-\.(?:[\d\w\.\-]+?))(?=[\w\d])(?=[\w\d\.\-]*?\.+[\w\d\.\-]*?)(?![\w\d\.\-]{254})(?!(?:\.?[\w\d\-\.]*?[\w\d\-]{64,}\.)+?)[\w\d\.\-]+?(?<![\w\d\-\.]*?\.[\d]+?)(?<=[\w\d\-]{2,})(?<![\w\d\-]{25})(\s*,\s*(?!.*?_.*?)(?!(?:[\d\w]+?\.)?\-[\w\d\.\-]*?)(?![\w\d]+?\-\.(?:[\d\w\.\-]+?))(?=[\w\d])(?=[\w\d\.\-]*?\.+[\w\d\.\-]*?)(?![\w\d\.\-]{254})(?!(?:\.?[\w\d\-\.]*?[\w\d\-]{64,}\.)+?)[\w\d\.\-]+?(?<![\w\d\-\.]*?\.[\d]+?)(?<=[\w\d\-]{2,})(?<![\w\d\-]{25}))*$/,
 		)
 	) {
 		return false;