Emdash source with visual editor image upload fix

Fixes:
1. media.ts: wrap placeholder generation in try-catch
2. toolbar.ts: check r.ok, display error message in popover

packages/admin/tests/lib/url.test.ts

@@ -0,0 +1,59 @@
+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");
+	});
+});