refactor(tlon): centralize Urbit request helpers

extensions/tlon/src/urbit/base-url.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from "vitest";
+import { validateUrbitBaseUrl } from "./base-url.js";
+
+describe("validateUrbitBaseUrl", () => {
+  it("adds https:// when scheme is missing and strips path/query fragments", () => {
+    const result = validateUrbitBaseUrl("example.com/foo?bar=baz");
+    expect(result.ok).toBe(true);
+    if (!result.ok) return;
+    expect(result.baseUrl).toBe("https://example.com");
+    expect(result.hostname).toBe("example.com");
+  });
+
+  it("rejects non-http schemes", () => {
+    const result = validateUrbitBaseUrl("file:///etc/passwd");
+    expect(result.ok).toBe(false);
+    if (result.ok) return;
+    expect(result.error).toContain("http:// or https://");
+  });
+
+  it("rejects embedded credentials", () => {
+    const result = validateUrbitBaseUrl("https://user:pass@example.com");
+    expect(result.ok).toBe(false);
+    if (result.ok) return;
+    expect(result.error).toContain("credentials");
+  });
+
+  it("normalizes a trailing dot in the hostname for origin construction", () => {
+    const result = validateUrbitBaseUrl("https://example.com./foo");
+    expect(result.ok).toBe(true);
+    if (!result.ok) return;
+    expect(result.baseUrl).toBe("https://example.com");
+    expect(result.hostname).toBe("example.com");
+  });
+
+  it("preserves port in the normalized origin", () => {
+    const result = validateUrbitBaseUrl("http://example.com:8080/~/login");
+    expect(result.ok).toBe(true);
+    if (!result.ok) return;
+    expect(result.baseUrl).toBe("http://example.com:8080");
+  });
+});