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import {
generateRegistrationOptions,
verifyRegistrationResponse,
generateAuthenticationOptions,
verifyAuthenticationResponse,
type RegistrationResponseJSON,
type AuthenticationResponseJSON,
type AuthenticatorTransportFuture,
} from "@simplewebauthn/server";
import type { Route } from "./+types/api.passkey";
import { getSession, commitSession } from "~/lib/session.server";
import {
upsertUser,
getUserById,
getCredentialById,
listCredentials,
saveCredential,
updateCredentialCounter,
} from "~/lib/db.server";
import { rpID, rpName, origin } from "~/lib/passkey.server";
function uuidToBytes(uuid: string): Uint8Array {
const hex = uuid.replace(/-/g, "");
const bytes = new Uint8Array(16);
for (let i = 0; i < 16; i++) bytes[i] = parseInt(hex.slice(i * 2, i * 2 + 2), 16);
return bytes;
}
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 === "reg-options") {
const body = (await request.json()) as { username?: string; token?: string };
const registerToken = process.env.REGISTER_TOKEN;
if (!registerToken || body.token !== registerToken) {
return Response.json({ error: "トークンが違います" }, { status: 403 });
}
const username = (body.username ?? "").trim();
if (!username) return Response.json({ error: "ユーザー名を入力してください" }, { status: 400 });
const userId = crypto.randomUUID();
const user = upsertUser(userId, username);
const options = await generateRegistrationOptions({
rpName,
rpID,
userID: uuidToBytes(user.id) as Uint8Array<ArrayBuffer>,
userName: user.username,
userDisplayName: user.username,
attestationType: "none",
authenticatorSelection: { residentKey: "required", userVerification: "required" },
excludeCredentials: listCredentials()
.filter((c) => c.user_id === user.id)
.map((c) => ({ id: c.id })),
});
session.set("challenge", options.challenge);
session.set("pendingUserId", user.id);
return Response.json(options, {
headers: { "Set-Cookie": await commitSession(session) },
});
}
if (intent === "reg-verify") {
const challenge = session.get("challenge") as string | undefined;
const pendingUserId = session.get("pendingUserId") as string | undefined;
if (!challenge || !pendingUserId) {
return Response.json({ error: "セッション切れです" }, { status: 400 });
}
const body = (await request.json()) as RegistrationResponseJSON;
let verification;
try {
verification = await verifyRegistrationResponse({
response: body,
expectedChallenge: challenge,
expectedOrigin: origin,
expectedRPID: rpID,
});
} catch (err) {
const msg = err instanceof Error ? err.message : String(err);
return Response.json({ error: msg }, { status: 400 });
}
if (!verification.verified || !verification.registrationInfo) {
return Response.json({ error: "登録に失敗しました" }, { status: 400 });
}
const { credential } = verification.registrationInfo;
saveCredential({
id: credential.id,
userId: pendingUserId,
publicKey: credential.publicKey,
counter: credential.counter,
transports: (body.response as { transports?: AuthenticatorTransportFuture[] }).transports,
});
const user = getUserById(pendingUserId)!;
session.unset("challenge");
session.unset("pendingUserId");
session.set("userId", user.id);
session.set("username", user.username);
return Response.json({ ok: true }, {
headers: { "Set-Cookie": await commitSession(session) },
});
}
if (intent === "login-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 === "login-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 cred = getCredentialById(body.id);
if (!cred) 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: cred.id,
publicKey: new Uint8Array(Buffer.from(cred.public_key, "base64url")),
counter: cred.counter,
transports: cred.transports
? (JSON.parse(cred.transports) as AuthenticatorTransportFuture[])
: undefined,
},
});
if (!verification.verified) {
return Response.json({ error: "認証に失敗しました" }, { status: 400 });
}
updateCredentialCounter(cred.id, verification.authenticationInfo.newCounter);
const user = getUserById(cred.user_id)!;
session.unset("challenge");
session.set("userId", user.id);
session.set("username", user.username);
return Response.json({ ok: true }, {
headers: { "Set-Cookie": await commitSession(session) },
});
}
return Response.json({ error: "不正なリクエスト" }, { status: 400 });
}
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