feat: add cookie helper for middlewares (#1275)

demo/nextjs/middleware.ts

@@ -1,20 +1,9 @@
-import { betterFetch } from "@better-fetch/fetch";
 import { NextRequest, NextResponse } from "next/server";
-import type { Session } from "./lib/auth-types";
+import { getSessionCookie } from "better-auth";
 
 export async function middleware(request: NextRequest) {
-	const { data: session } = await betterFetch<Session>(
-		"/api/auth/get-session",
-		{
-			baseURL: request.nextUrl.origin,
-			headers: {
-				//get the cookie from the request
-				cookie: request.headers.get("cookie") || "",
-			},
-		},
-	);
-
-	if (!session) {
+	const cookies = getSessionCookie(request);
+	if (!cookies) {
 		return NextResponse.redirect(new URL("/", request.url));
 	}
 	return NextResponse.next();