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import { Hono } from "hono";
import { afterEach, beforeEach, describe, expect, it } from "vitest";
import { createCorsMiddleware } from "./cors.js";
describe("createCorsMiddleware", () => {
const originalEnv = process.env.CORS_ORIGIN;
afterEach(() => {
if (originalEnv === undefined) {
delete process.env.CORS_ORIGIN;
} else {
process.env.CORS_ORIGIN = originalEnv;
}
});
describe("when CORS_ORIGIN is not set", () => {
beforeEach(() => {
delete process.env.CORS_ORIGIN;
});
it("does not add CORS headers", async () => {
const app = new Hono();
app.use("*", createCorsMiddleware());
app.get("/test", (c) => c.json({ ok: true }));
const res = await app.request("/test", {
headers: { Origin: "https://attacker.com" },
});
expect(res.status).toBe(200);
expect(res.headers.get("Access-Control-Allow-Origin")).toBeNull();
});
it("does not allow preflight requests", async () => {
const app = new Hono();
app.use("*", createCorsMiddleware());
app.get("/test", (c) => c.json({ ok: true }));
const res = await app.request("/test", {
method: "OPTIONS",
headers: {
Origin: "https://attacker.com",
"Access-Control-Request-Method": "POST",
},
});
expect(res.headers.get("Access-Control-Allow-Origin")).toBeNull();
});
});
describe("when CORS_ORIGIN is set to single origin", () => {
beforeEach(() => {
process.env.CORS_ORIGIN = "https://allowed.example.com";
});
it("allows requests from the configured origin", async () => {
const app = new Hono();
app.use("*", createCorsMiddleware());
app.get("/test", (c) => c.json({ ok: true }));
const res = await app.request("/test", {
headers: { Origin: "https://allowed.example.com" },
});
expect(res.status).toBe(200);
expect(res.headers.get("Access-Control-Allow-Origin")).toBe(
"https://allowed.example.com",
);
});
it("does not allow requests from other origins", async () => {
const app = new Hono();
app.use("*", createCorsMiddleware());
app.get("/test", (c) => c.json({ ok: true }));
const res = await app.request("/test", {
headers: { Origin: "https://attacker.com" },
});
expect(res.status).toBe(200);
expect(res.headers.get("Access-Control-Allow-Origin")).toBeNull();
});
it("handles preflight requests correctly", async () => {
const app = new Hono();
app.use("*", createCorsMiddleware());
app.post("/test", (c) => c.json({ ok: true }));
const res = await app.request("/test", {
method: "OPTIONS",
headers: {
Origin: "https://allowed.example.com",
"Access-Control-Request-Method": "POST",
},
});
expect(res.headers.get("Access-Control-Allow-Origin")).toBe(
"https://allowed.example.com",
);
expect(res.headers.get("Access-Control-Allow-Methods")).toContain("POST");
});
it("exposes rate limit headers", async () => {
const app = new Hono();
app.use("*", createCorsMiddleware());
app.get("/test", (c) => c.json({ ok: true }));
const res = await app.request("/test", {
method: "OPTIONS",
headers: {
Origin: "https://allowed.example.com",
"Access-Control-Request-Method": "GET",
},
});
const exposeHeaders = res.headers.get("Access-Control-Expose-Headers");
expect(exposeHeaders).toContain("RateLimit-Limit");
expect(exposeHeaders).toContain("RateLimit-Remaining");
expect(exposeHeaders).toContain("RateLimit-Reset");
});
});
describe("when CORS_ORIGIN is set to multiple origins", () => {
beforeEach(() => {
process.env.CORS_ORIGIN =
"https://app.example.com, https://admin.example.com";
});
it("allows requests from first configured origin", async () => {
const app = new Hono();
app.use("*", createCorsMiddleware());
app.get("/test", (c) => c.json({ ok: true }));
const res = await app.request("/test", {
headers: { Origin: "https://app.example.com" },
});
expect(res.headers.get("Access-Control-Allow-Origin")).toBe(
"https://app.example.com",
);
});
it("allows requests from second configured origin", async () => {
const app = new Hono();
app.use("*", createCorsMiddleware());
app.get("/test", (c) => c.json({ ok: true }));
const res = await app.request("/test", {
headers: { Origin: "https://admin.example.com" },
});
expect(res.headers.get("Access-Control-Allow-Origin")).toBe(
"https://admin.example.com",
);
});
it("does not allow requests from unlisted origins", async () => {
const app = new Hono();
app.use("*", createCorsMiddleware());
app.get("/test", (c) => c.json({ ok: true }));
const res = await app.request("/test", {
headers: { Origin: "https://other.example.com" },
});
expect(res.headers.get("Access-Control-Allow-Origin")).toBeNull();
});
});
});
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