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import { useState } from "react";
import { redirect } from "react-router";
import {
generateAuthenticationOptions,
verifyAuthenticationResponse,
type AuthenticationResponseJSON,
type AuthenticatorTransportFuture,
} from "@simplewebauthn/server";
import type { Route } from "./+types/auth.login";
import { getSession, commitSession } from "~/lib/session.server";
import { listCredentials, getCredentialById, updateCredentialCounter } from "~/lib/db.server";
import { rpID, origin } from "~/lib/passkey.server";
export async function loader({ request }: Route.LoaderArgs) {
const session = await getSession(request.headers.get("Cookie"));
if (session.get("authenticated")) return redirect("/");
if (listCredentials().length === 0) return redirect("/auth/register");
return {};
}
export async function action({ request }: Route.ActionArgs) {
const url = new URL(request.url);
const intent = url.searchParams.get("intent");
const session = await getSession(request.headers.get("Cookie"));
if (intent === "options") {
const credentials = listCredentials();
const options = await generateAuthenticationOptions({
rpID,
allowCredentials: credentials.map((c) => ({
id: c.id,
transports: c.transports
? (JSON.parse(c.transports) as AuthenticatorTransportFuture[])
: undefined,
})),
userVerification: "required",
});
session.set("challenge", options.challenge);
return Response.json(options, {
headers: { "Set-Cookie": await commitSession(session) },
});
}
if (intent === "verify") {
const challenge = session.get("challenge") as string | undefined;
if (!challenge) return Response.json({ error: "セッション切れです" }, { status: 400 });
const body = (await request.json()) as AuthenticationResponseJSON;
const credential = getCredentialById(body.id);
if (!credential) return Response.json({ error: "パスキーが見つかりません" }, { status: 400 });
const verification = await verifyAuthenticationResponse({
response: body,
expectedChallenge: challenge,
expectedOrigin: origin,
expectedRPID: rpID,
credential: {
id: credential.id,
publicKey: new Uint8Array(Buffer.from(credential.public_key, "base64url")),
counter: credential.counter,
transports: credential.transports
? (JSON.parse(credential.transports) as AuthenticatorTransportFuture[])
: undefined,
},
});
if (!verification.verified) {
return Response.json({ error: "認証に失敗しました" }, { status: 400 });
}
updateCredentialCounter(credential.id, verification.authenticationInfo.newCounter);
session.unset("challenge");
session.set("authenticated", true);
return redirect("/", {
headers: { "Set-Cookie": await commitSession(session) },
});
}
return Response.json({ error: "不正なリクエスト" }, { status: 400 });
}
export default function Login() {
const [status, setStatus] = useState<"idle" | "loading" | "error">("idle");
const [errorMsg, setErrorMsg] = useState("");
async function handleLogin() {
setStatus("loading");
setErrorMsg("");
try {
const { startAuthentication } = await import("@simplewebauthn/browser");
const optRes = await fetch("/auth/login?intent=options", { method: "POST" });
if (!optRes.ok) throw new Error("オプション取得に失敗しました");
const options = await optRes.json();
const authResponse = await startAuthentication({ optionsJSON: options });
const verRes = await fetch("/auth/login?intent=verify", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify(authResponse),
});
if (!verRes.ok) {
const err = await verRes.json();
throw new Error(err.error ?? "認証に失敗しました");
}
window.location.href = "/";
} catch (e) {
setStatus("error");
setErrorMsg(e instanceof Error ? e.message : "エラーが発生しました");
}
}
return (
<div className="wrap">
<header className="site-header">
<h1>log</h1>
</header>
<div className="auth-box">
<h2>ログイン</h2>
<p>登録済みのパスキーで認証します。</p>
<button className="btn" onClick={handleLogin} disabled={status === "loading"}>
{status === "loading" ? "認証中…" : "パスキーでログイン"}
</button>
{status === "error" && (
<p className="error-msg" style={{ marginTop: ".75rem" }}>{errorMsg}</p>
)}
</div>
</div>
);
}
|
