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export type GithubUser = {  id: number;  login: string;  avatar_url: string;  name: string;};
export type GithubOauthConfig = {  clientId?: string;  clientSecret?: string;};
export class GithubOauth implements Middleware {  readonly name: string = "github-oauth";
  #config: GithubOauthConfig;
  constructor(config: GithubOauthConfig) {    this.#config = config;  }
  async fetch(req: Request, ctx: Context) {    const { pathname, searchParams } = new URL(req.url);    const session = await ctx.getSession<{ user: GithubUser }>();
    if (pathname === "/logout") {      return session.end("/");    }
    if (!session.store?.user) {      const code = searchParams.get("code");      if (!code) {        const loginUrl =          `https://github.com/login/oauth/authorize?client_id=${this.#config.clientId}&scope=read:user+user:email`;        return new Response("Not logged in", {          status: 302,          headers: { Location: loginUrl },        });      }
      const ret: { access_token: string; error?: string } = await fetch(        "https://github.com/login/oauth/access_token",        {          method: "POST",          body: JSON.stringify({            client_id: this.#config.clientId,            client_secret: this.#config.clientSecret,            state: searchParams.get("state") || undefined,            code,          }),          headers: {            "Content-Type": "application/json",            "Accept": "application/json",          },        },      ).then((res) => res.json());      if (ret.error) {        return new Response(ret.error, { status: 500 });      }
      const user: GithubUser = await fetch("https://api.github.com/user", {        headers: {          "Authorization": `token ${ret.access_token}`,          "Accept": "application/json",        },      }).then((res) => res.json());
      return session.update(        { user },        searchParams.get("redirect") ?? "/",      );    }
    ctx.user = session.store.user;    return ctx.next();  }}