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import got, {type HTTPAlias, type Headers} from 'got';
import busGateway from './busGateway.ts';
import jose from './jose.ts';
import oidc from './oidc.ts';
import type {IResolution} from './Resolution.ts';
import tls from './tls.ts';
type Protocol = 'http' | 'https';
export interface IGatewayCodec {
gateway: ($meta: object, methodName: string) => object | void;
codec: (
$meta: object,
methodType: 'request' | 'publish',
) => Promise<{
encode: (...params: unknown[]) => Promise<{
params: object;
headers?: object;
method?: string;
}>;
decode: (result: unknown, unpack?: boolean) => Promise<unknown>;
requestParams: {
protocol: Protocol;
hostname: string;
port: string;
path: string;
cache?: string;
namespace?: string;
};
}>;
verify: (
token: string,
flags: {nonce?: string; audience: string},
isId?: boolean,
) => Promise<object>;
}
export interface IConfig {
client?: {tls?: {ca?: string | string[]; key?: string; cert?: string; crl?: string}};
gateway?: object;
protocol?: Protocol;
host?: string;
port?: string;
service?: string;
openId?: unknown;
blongLogin?: unknown;
}
type Sender = (a: unknown, b: unknown) => Promise<unknown>;
export default class GatewayCodecImpl implements IGatewayCodec {
#gatewayCodec: Promise<ReturnType<typeof busGateway>>;
#protocol: Protocol;
#port: string;
#config: IConfig;
#tlsClient: object;
#resolution: IResolution;
public verify!: IGatewayCodec['verify'];
public constructor(
config: IConfig,
protocol: Protocol,
port: string,
errors: unknown,
sender: Sender,
resolution: IResolution,
) {
this.#config = config;
this.#protocol = protocol;
this.#port = port;
this.#tlsClient = tls(this.#config.client ?? {}, true) as object;
this.#resolution = resolution;
async function session(token: {
oid?: string;
sub?: string;
per?: string;
ses?: string;
enc?: object;
sig?: object;
}): Promise<void> {
const result = (await sender(
{
username: token.oid || token.sub,
installationId: token.oid || token.sub,
type: 'oidc',
password: '*',
channel: 'web',
},
{method: 'identity.checkInternal'},
)) as [
{
'identity.check': {
actorId: unknown;
sessionId: string;
};
permissionMap: string;
mle?: {
mlek: string;
mlsk: string;
};
},
];
const [
{
'identity.check': {actorId, sessionId},
permissionMap,
mle,
},
] = result;
if (token) {
token.per = permissionMap;
token.ses = sessionId;
if (mle && mle.mlek) token.enc = JSON.parse(mle.mlek);
if (mle && mle.mlsk) token.sig = JSON.parse(mle.mlsk);
token.sub = String(actorId);
}
}
const {verify, get} = oidc({
async request(
{
json,
method,
url,
headers,
}: {
json: unknown;
method: HTTPAlias;
url: string;
headers: Headers;
},
callback: (error: Error | null, response?: unknown, body?: unknown) => void,
) {
try {
const response = await got(url, {
method,
headers,
responseType: json ? 'json' : undefined,
});
if (response.request) Object.assign(response.request, {method, href: url});
callback(null, response, response.body);
} catch (error) {
callback(error as Error);
}
},
discoverService: this._discoverService.bind(this),
errorPrefix: 'rpc.',
errors: errors as never,
session,
tls: this.#tlsClient,
issuers: (config.openId || {
...(config.blongLogin !== false && {'blong-login': {audience: 'blong'}}),
}) as unknown as Record<string, false | {[key: string]: unknown}>,
} as unknown as Parameters<typeof oidc>[0]);
this.#gatewayCodec = (async () => {
const mleClient = await jose((config.client || {}) as Parameters<typeof jose>[0]);
return busGateway({
errorPrefix: 'rpc.',
serverInfo: (key: 'protocol' | 'port') => ({protocol, port})[key],
mleClient: mleClient as never,
errors: errors as never,
get: get as never,
} as never) as unknown as ReturnType<typeof busGateway>;
})();
this.verify = verify as IGatewayCodec['verify'];
}
public gateway($meta: IMeta, methodName: string = $meta.method!): object | void {
if (this.#config.gateway && methodName !== 'identity.checkInternal') {
const gw = this.#config.gateway as Record<string, unknown>;
const [prefix, method] = methodName.split('/');
if (method) {
if (gw[prefix]) return {...(gw[prefix] as object), ...$meta.gateway, method};
} else {
const [namespace] = prefix.split('.');
const gwEntry = gw[namespace] || gw[prefix];
if (gwEntry) return {...(gwEntry as object), ...$meta.gateway, method: prefix};
}
}
if ($meta.gateway) return {...$meta.gateway, method: methodName};
}
public async codec(
$meta: IMeta,
methodType: 'request' | 'publish',
): ReturnType<IGatewayCodec['codec']> {
const gatewayConfig = this.gateway($meta);
if (gatewayConfig)
return (await this.#gatewayCodec)(gatewayConfig as never) as unknown as Awaited<
ReturnType<IGatewayCodec['codec']>
>;
const [namespace, event] = $meta.method!.split('.');
const op = ['start', 'stop', 'drain'].includes(event) ? event : methodType;
return {
encode: async (...params) => ({params}),
decode: async result => result,
requestParams: {
...(await this._discoverService('rpc-' + namespace)),
path: `/rpc/ports/${namespace}/${op}`,
},
};
}
private async _discoverService(namespace: string): Promise<{
protocol: Protocol;
hostname: string;
port: string;
service: string;
}> {
const serviceName = namespace.replace(/\//g, '-');
const params = {
protocol: this.#config.protocol || this.#protocol,
hostname: this.#config.host || serviceName,
port: this.#config.port || this.#port,
service: this.#config.service!,
};
const requestParams = Object.assign({}, params);
if (this.#resolution)
Object.assign(
requestParams,
await this.#resolution.resolve(serviceName, false, namespace),
);
return requestParams;
}
}
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