check callback from lichess server

src/server/lichess.ts

@@ -0,0 +1,35 @@
+import { randomBytes } from "node:crypto";
+import { redirect } from "@tanstack/react-router";
+import { createServerFn } from "@tanstack/react-start";
+import { env } from "#/env.ts";
+import { base64UrlEncode, sha256 } from "#/lib/encodeDecode.ts";
+
+export const getToken = createServerFn({ method: "POST" }).handler(async () => {
+	console.log("getTokens");
+});
+
+export const login = createServerFn({ method: "POST" }).handler(async () => {
+	const createVerifier = () => base64UrlEncode(randomBytes(32));
+	const createChallenge = (verifier: string) =>
+		base64UrlEncode(sha256(verifier));
+
+	const verifier = createVerifier();
+	const challenge = createChallenge(verifier);
+
+	const params = new URLSearchParams({
+		response_type: "code",
+		client_id: env.LICHESS_CLIENT_ID || "",
+		redirect_uri: `${process.env.NODE_ENV === "production" ? `https://${env.LICHESS_CLIENT_ID}/callback` : "http://localhost:3000/callback"}`,
+		scope: "study:read",
+		code_challenge_method: "S256",
+		code_challenge: challenge,
+	});
+
+	throw redirect({
+		href: `https://lichess.org/oauth?${params.toString()}`,
+		statusCode: 302,
+		headers: {
+			"Set-Cookie": `lichess_oauth_verifier=${verifier}; Path=/; HttpOnly; Secure; SameSite=Lax; Max-Age=600`, // Expires in 10 mins
+		},
+	});
+});