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// const [httpPost] = [request.post].map(require('util').promisify);
import type {Errors, IMeta, ITypedError} from '@feasibleone/blong';
import ky from 'ky';
const decode = (result: unknown, method: string, unpack: boolean) =>
unpack ? result : [result, {method, mtid: 'response'}];
export default ({
serverInfo,
mleClient,
errors,
get,
}: {
serverInfo: (key: 'protocol' | 'port') => string;
mleClient: {
keys: {sign?: string; encrypt?: string};
signEncrypt: (
params: unknown,
encryptKey: string,
localKeys?: {mlsk: string; mlek: string},
) => Promise<unknown>;
decryptVerify: (result: unknown, signKey: string) => Promise<unknown>;
};
errors: Errors<{
'bus.jsonRpcHttp': unknown;
'bus.jsonRpcEmpty': unknown;
}>;
get: (
url: string,
httpErrorType: (params?: unknown, $meta?: IMeta) => ITypedError,
emptyErrorType: (params?: unknown, $meta?: IMeta) => ITypedError,
) => Promise<{
sign: string;
encrypt: string;
}>;
}) => {
const localCache: Record<
string,
{
auth?: {
access_token: string;
refresh_token: string;
expires_in: number;
refresh_token_expires_in: number;
sign?: string;
encrypt?: string;
};
tokenInfo?: {
tokenExpire: number;
refreshTokenExpire: number;
};
remoteKeys?: {
sign: string;
encrypt: string;
};
}
> = {};
const localKeys =
mleClient.keys.sign && mleClient.keys.encrypt
? {mlsk: mleClient.keys.sign, mlek: mleClient.keys.encrypt}
: undefined;
function tokenInfo(auth: {expires_in: number; refresh_token_expires_in: number}) {
const now = Date.now() - 5000; // latency tolerance of 5 seconds
return {
tokenExpire: now + auth.expires_in * 1000,
refreshTokenExpire: now + auth.refresh_token_expires_in * 1000,
};
}
async function login(
cache: (typeof localCache)[string],
url: string,
username?: string,
password?: string,
channel?: string,
) {
const {sign, encrypt} = (localKeys && (cache.auth || cache.remoteKeys)) || {};
if (sign && encrypt && localKeys) {
const {result, error} = await ky
.post<{result: unknown; error: unknown}>(`${url}/rpc/login/identity/exchange`, {
json: {
jsonrpc: '2.0',
method: 'login.identity.exchange',
id: 1,
params: await mleClient.signEncrypt(
{username, password, channel},
encrypt,
localKeys,
),
},
})
.json();
if (error) throw Object.assign(new Error(), await mleClient.decryptVerify(error, sign));
else if (result)
cache.auth = (await mleClient.decryptVerify(result, sign)) as {
access_token: string;
refresh_token: string;
expires_in: number;
refresh_token_expires_in: number;
sign?: string;
encrypt?: string;
};
else throw errors['bus.jsonRpcEmpty']();
} else {
const {result, error} = await ky
.post<{result: unknown; error: unknown}>(`${url}/rpc/login/identity/check`, {
json: {
jsonrpc: '2.0',
method: 'login.identity.check',
id: 1,
params: {username, password, channel},
},
})
.json();
if (error) throw Object.assign(new Error(), error);
else if (result)
cache.auth = result as {
access_token: string;
refresh_token: string;
expires_in: number;
refresh_token_expires_in: number;
sign?: string;
encrypt?: string;
};
else throw errors['bus.jsonRpcEmpty']();
}
cache.tokenInfo = tokenInfo(cache.auth);
}
return async function gateway({
username,
password,
channel = 'web',
protocol = serverInfo('protocol'),
host: hostname = 'localhost',
port = serverInfo('port'),
url,
auth,
method,
}: {
username?: string;
password?: string;
channel?: string;
protocol?: string;
host?: string;
port?: number | string;
url?: string;
tls?: boolean;
auth?: {
access_token: string;
refresh_token: string;
expires_in: number;
refresh_token_expires_in: number;
sign?: string;
encrypt?: string;
};
encrypt?: boolean;
method: string;
}) {
// don't put a default value for uri in arguments as it can be empty string or null
if (url) {
const parsed = new URL(url);
hostname = parsed.hostname;
port = parsed.port;
protocol = parsed.protocol.split(':')[0];
if (parsed.username) username = parsed.username;
if (parsed.password) password = parsed.password;
} else {
protocol = protocol && protocol.split(':')[0];
url = `${protocol}://${hostname}:${port}`;
}
const codec: {
encode?: (params: unknown) => Promise<unknown> | unknown;
decode?: (result: unknown, unpack: boolean) => Promise<unknown> | unknown;
requestParams?: {
protocol: string;
hostname: string;
port: number | string;
path: string;
};
} = {
requestParams: {
protocol,
hostname,
port,
path: `/rpc/${method.replace(/\./g, '/')}`,
},
};
const cache = (localCache[url] = localCache[url] || {});
if (localKeys && !cache.remoteKeys) {
const body = await get(
`${url}/rpc/login/.well-known/mle`,
errors['bus.jsonRpcHttp'],
errors['bus.jsonRpcEmpty'],
);
if (body.sign && body.encrypt) cache.remoteKeys = body;
}
if (auth) {
cache.auth = auth;
cache.tokenInfo = tokenInfo(auth);
}
if (!cache.auth && !(username && password)) {
if (cache.remoteKeys) {
const remoteKeys = cache.remoteKeys;
codec.encode = async params => ({
params: await mleClient.signEncrypt(
params,
remoteKeys.encrypt,
localKeys,
),
method,
});
codec.decode = async (result, unpack) =>
decode(
await mleClient.decryptVerify(result, remoteKeys.sign),
method,
unpack,
);
} else {
codec.encode = params => ({params, method});
codec.decode = (result, unpack) => decode(result, method, unpack);
}
return codec;
}
if (!cache.auth) await login(cache, url, username, password, channel);
const exp = Date.now();
if (exp > cache.tokenInfo!.tokenExpire) {
if (exp > cache.tokenInfo!.refreshTokenExpire) {
await login(cache, url, username, password, channel);
} else {
const {body} = await ky
.post<{body: {expires_in: number; refresh_token_expires_in: number}}>(
`${url}/rpc/login/token`,
{
json: {
grant_type: 'refresh_token',
refresh_token: cache.auth!.refresh_token,
},
},
)
.json();
Object.assign(cache.auth!, body);
cache.tokenInfo = tokenInfo(body);
}
}
const cachedAuth = cache.auth!;
if (cachedAuth.sign && cachedAuth.encrypt) {
codec.encode = async params => ({
params: await mleClient.signEncrypt(params, cachedAuth.encrypt!),
headers: {
authorization: 'Bearer ' + cachedAuth.access_token,
},
method,
});
codec.decode = async (result, unpack) =>
decode(await mleClient.decryptVerify(result, cachedAuth.sign!), method, unpack);
} else {
codec.encode = params => ({
params,
headers: {
authorization: 'Bearer ' + cachedAuth.access_token,
},
method,
});
codec.decode = (result, unpack) => decode(result, method, unpack);
}
return codec;
};
};
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