import { describe, it, expect } from "vitest";

import { sanitizeRedirectUrl } from "../../src/lib/url";

describe("sanitizeRedirectUrl", () => {
	it("allows simple relative paths", () => {
		expect(sanitizeRedirectUrl("/_emdash/admin")).toBe("/_emdash/admin");
	});

	it("allows deep relative paths", () => {
		expect(sanitizeRedirectUrl("/_emdash/admin/content/posts")).toBe(
			"/_emdash/admin/content/posts",
		);
	});

	it("allows root path", () => {
		expect(sanitizeRedirectUrl("/")).toBe("/");
	});

	it("allows paths with query strings", () => {
		expect(sanitizeRedirectUrl("/_emdash/admin?tab=settings")).toBe("/_emdash/admin?tab=settings");
	});

	it("allows paths with hash fragments", () => {
		expect(sanitizeRedirectUrl("/_emdash/admin#section")).toBe("/_emdash/admin#section");
	});

	it("rejects absolute http URLs (open redirect)", () => {
		expect(sanitizeRedirectUrl("https://evil.com/phishing")).toBe("/_emdash/admin");
	});

	it("rejects absolute http URLs without TLS", () => {
		expect(sanitizeRedirectUrl("http://evil.com")).toBe("/_emdash/admin");
	});

	it("rejects protocol-relative URLs (//evil.com)", () => {
		expect(sanitizeRedirectUrl("//evil.com/phishing")).toBe("/_emdash/admin");
	});

	it("rejects javascript: scheme (DOM XSS)", () => {
		expect(sanitizeRedirectUrl("javascript:alert(document.cookie)")).toBe("/_emdash/admin");
	});

	it("rejects data: scheme", () => {
		expect(sanitizeRedirectUrl("data:text/html,<script>alert(1)</script>")).toBe("/_emdash/admin");
	});

	it("rejects backslash trick (/\\evil.com)", () => {
		expect(sanitizeRedirectUrl("/\\evil.com")).toBe("/_emdash/admin");
	});

	it("rejects empty string", () => {
		expect(sanitizeRedirectUrl("")).toBe("/_emdash/admin");
	});

	it("rejects bare domain", () => {
		expect(sanitizeRedirectUrl("evil.com")).toBe("/_emdash/admin");
	});
});