feat: support duplicate base path handling in router

Author: Bekacru

src/router.test.ts

@@ -183,6 +183,25 @@ describe("router", () => {
 		const response = await router.handler(new Request("http://localhost"));
 		expect(response.status).toBe(403);
 	});
+
+	it("should work with duplicate base path", async () => {
+		const endpoint = createEndpoint(
+			"/test/api/v1/test",
+			{
+				method: "GET",
+			},
+			async (c) => {
+				return c.path;
+			},
+		);
+		const router = createRouter({ endpoint }, { basePath: "/api/v1" });
+		const response = await router.handler(
+			new Request("http://localhost/api/v1/test/api/v1/test"),
+		);
+		expect(response.status).toBe(200);
+		const text = await response.text();
+		expect(text).toBe("/test/api/v1/test");
+	});
 });
 
 describe("route middleware", () => {

src/router.ts

@@ -123,7 +123,21 @@ export const createRouter = <E extends Record<string, Endpoint>, Config extends
 
 	const processRequest = async (request: Request) => {
 		const url = new URL(request.url);
-		const path = config?.basePath ? url.pathname.split(config.basePath)[1] : url.pathname;
+		const path = config?.basePath
+			? url.pathname
+					.split(config.basePath)
+					.reduce((acc, curr, index) => {
+						if (index !== 0) {
+							if (index > 1) {
+								acc.push(`${config.basePath}${curr}`);
+							} else {
+								acc.push(curr);
+							}
+						}
+						return acc;
+					}, [] as string[])
+					.join("")
+			: url.pathname;
 
 		if (!path?.length) {
 			return new Response(null, { status: 404, statusText: "Not Found" });