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import { useState } from "react";
import { redirect } from "react-router";
import type { Route } from "./+types/auth.register";
import { getSession } from "~/lib/session.server";
import type { RegistrationResponseJSON, AuthenticatorTransportFuture } from "@simplewebauthn/server";
export async function loader({ request }: Route.LoaderArgs) {
const session = await getSession(request.headers.get("Cookie"));
if (session.get("authenticated")) return redirect("/");
return {};
}
function b64urlToBuffer(b64url: string): ArrayBuffer {
const base64 = b64url.replace(/-/g, "+").replace(/_/g, "/");
const pad = "=".repeat((4 - (base64.length % 4)) % 4);
const binary = atob(base64 + pad);
const bytes = new Uint8Array(binary.length);
for (let i = 0; i < binary.length; i++) bytes[i] = binary.charCodeAt(i);
return bytes.buffer;
}
function bufferToB64url(buf: ArrayBuffer): string {
const bytes = new Uint8Array(buf);
let binary = "";
for (let i = 0; i < bytes.byteLength; i++) binary += String.fromCharCode(bytes[i]);
return btoa(binary).replace(/\+/g, "-").replace(/\//g, "_").replace(/=/g, "");
}
export default function Register() {
const [token, setToken] = useState("");
const [status, setStatus] = useState<"idle" | "loading" | "error">("idle");
const [errorMsg, setErrorMsg] = useState("");
async function handleRegister() {
setStatus("loading");
setErrorMsg("");
try {
const optRes = await fetch("/api/passkey?intent=reg-options", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ token }),
});
if (!optRes.ok) {
const err = await optRes.json();
throw new Error(err.error ?? "オプション取得に失敗しました");
}
const optJSON = await optRes.json();
const userObj = optJSON.user as Record<string, string>;
const challenge = b64urlToBuffer(optJSON.challenge as string);
const credential = await navigator.credentials.create({
publicKey: {
rp: { name: (optJSON.rp as Record<string, string>).name },
user: {
id: b64urlToBuffer(userObj.id),
name: userObj.name,
displayName: userObj.displayName ?? userObj.name,
},
challenge,
pubKeyCredParams: optJSON.pubKeyCredParams as PublicKeyCredentialParameters[],
},
}) as PublicKeyCredential | null;
if (!credential) throw new Error("クレデンシャルの作成に失敗しました");
const attestation = credential.response as AuthenticatorAttestationResponse;
const regResponse: RegistrationResponseJSON = {
id: credential.id,
rawId: bufferToB64url(credential.rawId),
response: {
clientDataJSON: bufferToB64url(attestation.clientDataJSON),
attestationObject: bufferToB64url(attestation.attestationObject),
transports: attestation.getTransports
? (attestation.getTransports() as AuthenticatorTransportFuture[])
: [],
},
authenticatorAttachment: credential.authenticatorAttachment ?? undefined,
clientExtensionResults: credential.getClientExtensionResults(),
type: "public-key",
};
const verRes = await fetch("/api/passkey?intent=reg-verify", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify(regResponse),
});
if (!verRes.ok) {
const err = await verRes.json();
throw new Error(err.error ?? "登録に失敗しました");
}
window.location.href = "/";
} catch (e) {
setStatus("error");
setErrorMsg(e instanceof Error ? `${e.name}: ${e.message}` : String(e));
}
}
return (
<div className="wrap">
<header className="site-header">
<h1>log</h1>
</header>
<div className="auth-box">
<h2>パスキーを登録</h2>
<p>登録トークンを入力してパスキーを作成します。</p>
<input
type="password"
placeholder="登録トークン"
value={token}
onChange={(e) => setToken(e.target.value)}
onKeyDown={(e) => e.key === "Enter" && handleRegister()}
style={{
width: "100%",
marginBottom: ".75rem",
padding: ".5rem .75rem",
border: "1px solid #d1d5db",
borderRadius: "4px",
fontSize: ".875rem",
fontFamily: "ui-monospace, monospace",
}}
/>
<button className="btn" onClick={handleRegister} disabled={status === "loading" || !token}>
{status === "loading" ? "登録中…" : "パスキーを登録"}
</button>
{status === "error" && (
<p className="error-msg" style={{ marginTop: ".75rem" }}>{errorMsg}</p>
)}
</div>
</div>
);
}
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