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import {type Response} from 'got';
import {exportJWK, generateKeyPair} from 'jose';
import joseFactory from '../../../jose.ts';
const isBrowser: boolean = typeof window !== 'undefined' && typeof window.document !== 'undefined';
const key = async (alg: string, options?: object): Promise<object> => ({
alg,
...(await exportJWK((await generateKeyPair(alg, options)).privateKey)),
});
interface IToken {
access_token: string;
expires_in: number;
refresh_token?: string;
refresh_token_expires_in?: number;
}
export default handler<{
token: unknown;
tokenExpire: number;
}>(({config: {token, tokenExpire}}) => {
let jose: Awaited<ReturnType<typeof joseFactory>> | undefined,
serverKey: {encrypt: unknown; sign: unknown},
pending: Promise<{body?: unknown}> | null,
refreshToken: string | null,
refreshTokenExpire: number;
const encrypt = (msg: unknown, protectedHeader?: object): unknown => {
return jose
? globalThis.window &&
msg &&
(msg as Record<string, unknown>).formData instanceof globalThis.window.FormData
? msg
: jose.signEncrypt(
msg as object,
serverKey.encrypt as Parameters<typeof jose.signEncrypt>[1],
protectedHeader,
)
: msg;
};
const decrypt = async (object: object, property: string): Promise<void> => {
const rec = object as Record<string, unknown>;
if (rec?.[property] && typeof rec[property] !== 'string') {
if (
typeof window === 'object' &&
'result' in rec &&
rec.result instanceof window.Blob
) {
rec[property] = rec.result;
} else if (jose) {
const decrypted = await jose.decryptVerify(
rec[property] as Parameters<typeof jose.decryptVerify>[0],
serverKey.sign as Parameters<typeof jose.decryptVerify>[1],
);
if (rec) rec[property] = decrypted;
}
}
};
// Public (auth: 'login') endpoints — pre-auth callers hold no blong token, so the MLE
// request is encrypted with the handshake keys carried in the JWE protected header.
// Shared by the loginTokenCreate / accessRegistrationAdd / loginTokenExchange /
// loginTokenRefresh / loginTokenRestore request senders.
const encryptPublic = async (
params: {$http?: unknown} & Record<string, unknown>,
): Promise<{$http?: unknown} & Record<string, unknown>> => {
if (!jose) return params;
const {$http, ...rest} = params;
const encrypted = (await encrypt(rest, {
mlsk: jose.keys.sign,
mlek: jose.keys.encrypt,
})) as typeof params;
if ($http && encrypted) encrypted.$http = $http;
return encrypted;
};
function readToken(where: IToken): void {
tokenExpire = Date.now() + where.expires_in * 1000 - 5000; // let it refresh 5 seconds earlier
token = where.access_token;
if (where.refresh_token) {
refreshToken = where.refresh_token;
refreshTokenExpire = Date.now() + where.refresh_token_expires_in! * 1000 + 5000; // give it extra 5 seconds validity
}
}
function clearTokens(): void {
token = null;
tokenExpire = 0;
refreshToken = null;
refreshTokenExpire = 0;
}
/**
* Redeem a refresh token at `login.token.refresh` (auth: 'login' — MLE
* handshake keys, plain JSON-RPC response). On success the new access +
* refresh tokens are stored in memory. On refusal (revoked / inactive /
* expired session) the tokens are cleared so the next request surfaces a
* clean 401 to the caller, which the UI turns into a login prompt.
*/
async function refresh(this: {
exec?(...params: unknown[]): Promise<unknown>;
error?(error: unknown, $meta?: unknown): void;
}, opts: {force?: boolean} = {}): Promise<void> {
const now = Date.now();
if (token && (opts.force || tokenExpire < now)) {
if (refreshToken && refreshTokenExpire > now) {
try {
pending =
pending ||
(async () => {
const params = await encryptPublic({refreshToken});
const result = (await this.exec!(
{
path: '/rpc/login/token/refresh',
method: 'POST',
responseType: 'json',
json: {
jsonrpc: '2.0',
id: 1,
method: 'login.token.refresh',
params,
},
},
{},
)) as {
statusCode?: number;
body?: {result?: IToken; error?: {type?: string; message?: string; statusCode?: number}};
};
return result;
})();
const result = await pending!;
if (pending !== null) pending = null;
const {body, statusCode} = result as {
statusCode?: number;
body?: {result?: IToken; error?: {type?: string; message?: string; statusCode?: number}};
};
// The gateway MLE-encrypts the response with the handshake
// keys, so decrypt the result before reading the token.
await decrypt(body as object, 'result');
if (body?.error || (statusCode != null && statusCode >= 400)) {
clearTokens();
const error = new Error(
body?.error?.message || 'Token refresh failed',
) as Error & {
type?: string;
statusCode?: number;
auth?: boolean;
};
error.type = body?.error?.type || 'rpc.refreshFailed';
error.statusCode = body?.error?.statusCode ?? statusCode ?? 401;
error.auth = true;
throw error;
}
readToken(body!.result as IToken);
} catch (error) {
pending = null;
// Keep auth-classified failures as-is; otherwise drop tokens
// so the next request reports a clean 401.
if (!(error as {auth?: boolean}).auth) clearTokens();
throw error;
}
} else clearTokens();
}
}
return {
async ready() {
let mleKey = null; // isBrowser && JSON.parse(window.localStorage.getItem('mle-jose') || 'null');
if (!mleKey) {
const {body: {sign, encrypt} = {}}: {body?: {sign?: unknown; encrypt?: unknown}} =
(await (this as {exec?(...params: unknown[]): Promise<unknown>}).exec!(
{
method: 'GET',
responseType: 'json',
path: '/rpc/login/.well-known/mle',
},
{},
)) as {body?: {sign?: unknown; encrypt?: unknown}};
if (sign && encrypt) {
const signKey = await key('ES384', {crv: 'P-384', extractable: true});
const encryptKey = await key('ECDH-ES+A256KW', {
crv: 'P-384',
extractable: true,
});
mleKey = {
serverKey: {sign, encrypt},
clientKey: {
sign: signKey,
encrypt: encryptKey,
},
};
if (isBrowser) window.localStorage.setItem('mle-jose', JSON.stringify(mleKey));
}
}
if (mleKey) {
if (isBrowser && (!window.crypto || !window.crypto.subtle)) {
const errorMessage =
window.location.protocol === 'https:'
? "Your browser doesn't support SubtleCrypto interface of the Web Crypto API"
: 'SubtleCrypto interface of the Web Crypto API is available only in secure contexts (HTTPS) ';
window.alert(errorMessage);
throw new Error(errorMessage);
}
jose = await joseFactory(mleKey.clientKey);
serverKey = mleKey.serverKey;
}
},
async send(
params: {
$http?: {
url?: string;
method?: string;
headers?: {authorization?: string};
path?: unknown;
};
},
$meta: unknown,
) {
let {$http, ...rest} = params; // eslint-disable-line prefer-const
params = (await encrypt(params instanceof Array ? params : rest)) as typeof params;
await refresh.call(this);
if (token) {
$http = $http || {};
if (!$http.headers) $http.headers = {};
$http.headers.authorization = 'Bearer ' + token;
}
if ($http && params) params.$http = $http;
// An unexpected 401 is surfaced as-is: the automatic pre-send
// `refresh()` above already renewed the token when it was close to
// expiry, so a 401 here means the session is genuinely unusable
// (e.g. revoked/closed server-side) — a forced renewal would only
// add a failing round-trip. The UI turns the 401 into a login
// prompt.
return super.send(params, $meta);
},
async receive(
result: Response<{
jsonrpc?: string;
error?: object;
result?: object;
validation?: unknown;
debug?: unknown;
}>,
$meta: unknown,
) {
await decrypt(result.body, 'error');
await decrypt(result.body, 'result');
this.log?.debug?.(
{...(result.body?.error || result.body?.result), $meta},
result.body?.error ? 'Received error response' : 'Received successful response',
);
return super.receive(result, $meta);
},
async errorReceive(result: Response, $meta: unknown) {
if (result.statusCode === 401) token = null;
await decrypt(result.body as object, 'error');
return super.receive(result, $meta);
},
async loginTokenCreateRequestSend(params: {$http?: unknown}, $meta: unknown) {
return super.send(await encryptPublic(params), $meta);
},
async loginTokenCreateResponseReceive(result: Response<{result: unknown}>, $meta: unknown) {
await decrypt(result.body, 'result');
if ((result.body as {error?: unknown})?.error) return super.receive(result, $meta);
readToken(result.body.result as IToken);
return super.receive(result, $meta);
},
// Explicit token renewal (auth: 'login') — the same path the automatic
// `refresh()` uses; feeds the new tokens into memory.
async loginTokenRefreshRequestSend(params: {$http?: unknown}, $meta: unknown) {
return super.send(await encryptPublic(params), $meta);
},
async loginTokenRefreshResponseReceive(result: Response<{result: unknown}>, $meta: unknown) {
await decrypt(result.body, 'result');
if ((result.body as {error?: unknown})?.error) return super.receive(result, $meta);
readToken(result.body.result as IToken);
return super.receive(result, $meta);
},
// Public (auth: 'login') endpoints — see encryptPublic.
async accessRegistrationAddRequestSend(params: {$http?: unknown}, $meta: unknown) {
return super.send(await encryptPublic(params), $meta);
},
async loginTokenExchangeRequestSend(params: {$http?: unknown}, $meta: unknown) {
return super.send(await encryptPublic(params), $meta);
},
// Session restore (auth: 'login') — exchanges the path-scoped HttpOnly
// cookie for fresh tokens; the response feeds the same readToken path.
async loginTokenRestoreRequestSend(params: {$http?: unknown}, $meta: unknown) {
return super.send(await encryptPublic(params), $meta);
},
async loginTokenRestoreResponseReceive(result: Response<{result: unknown}>, $meta: unknown) {
await decrypt(result.body, 'result');
if ((result.body as {error?: unknown})?.error) return super.receive(result, $meta);
readToken(result.body.result as IToken);
return super.receive(result, $meta);
},
};
});
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