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import fp from 'fastify-plugin';
import jose from './jose.ts';
export type IConfig = Parameters<typeof jose>[0] & {public: {sign: unknown; encrypt: unknown}};
export default fp<IConfig>(async function mlePlugin(fastify: FastifyInstance, config: IConfig) {
const mle = await jose(config);
if (config) {
config.public.sign = mle.keys.sign;
config.public.encrypt = mle.keys.encrypt;
}
fastify.addHook(
'preValidation',
async (request: FastifyRequest<{Body: {jsonrpc?: string}}>, reply) => {
if (
request.routeOptions.config.auth &&
request.headers['content-type'] === 'application/json'
) {
const [where, what]: [Record<string, unknown>, string] = (
request.body?.jsonrpc ? [request.body, 'params'] : [request, 'body']
) as [Record<string, unknown>, string];
if (where[what] && request.routeOptions.config.mle !== false) {
const credentials = request.auth?.credentials;
if (!credentials) {
reply.code(401);
throw new Error('Missing authorization');
}
try {
if (credentials.mlsk === 'header' && credentials.mlek === 'header') {
const {
protectedHeader: {mlsk, mlek},
plaintext,
} = (await mle.decrypt(where[what] as string, {complete: true})) as {
plaintext: string | Uint8Array;
protectedHeader: {mlek?: {type: string}; mlsk?: {type: string}};
};
credentials.mlsk = mlsk;
credentials.mlek = mlek;
where[what] = await mle.verify(
plaintext,
mlsk as unknown as Parameters<typeof mle.verify>[1],
);
} else {
where[what] = await mle.decryptVerify(
where[what] as string,
credentials.mlsk as Parameters<typeof mle.decryptVerify>[1],
);
}
} catch (error) {
reply.code(400);
const newError = new Error('Decryption failed');
newError.cause = error instanceof Error ? error : String(error);
throw newError;
}
}
}
},
);
fastify.addHook(
'preSerialization',
async (
request,
reply,
payload:
| Error
| {
id?: unknown;
jsonrpc?: unknown;
result?: Record<string, unknown>;
error?: Record<string, unknown>;
checkpoints?: unknown;
},
) => {
if (payload instanceof Error) return payload;
if (
request.routeOptions.config.auth &&
request.headers['content-type'] === 'application/json' &&
payload
) {
const encrypt: (message: object) => unknown = message =>
request.routeOptions.config.mle === false
? message
: mle.signEncrypt(
message,
request.auth?.credentials?.mlek as {type: string},
);
const where = payload.jsonrpc
? payload
: {
result: payload,
id: undefined,
jsonrpc: undefined,
error: undefined,
checkpoints: undefined,
};
let result,
error = undefined as string | undefined;
const code = reply.statusCode.toString().slice(0, 1) + 'xx';
if ('result' in where)
result = reply.serializeInput(
where.result as Record<string, unknown>,
code,
) as string;
if (payload.jsonrpc && 'error' in where)
error = reply.serializeInput(
payload.error as Record<string, unknown>,
code,
) as string;
reply.serializer(x => x);
try {
return JSON.stringify({
id: where.id,
jsonrpc: where.jsonrpc,
result: result && (await encrypt(Buffer.from(result))),
error: error && (await encrypt(Buffer.from(error))),
checkpoints: where.checkpoints,
});
} catch (error) {
reply.code(400);
throw error;
}
}
},
);
fastify.route({
method: 'GET',
url: '/rpc/login/.well-known/mle',
config: {auth: false},
handler() {
return config.public;
},
});
});
|