import express from 'express'
import {Issuer, generators} from 'openid-client'
import bodyParser from 'body-parser'

async function run() {
    const app = express();
    app.use(bodyParser.urlencoded());
    app.use(bodyParser.json())

    const issuer = await Issuer.discover(process.env.OIDC_GATEWAY_URI);
    console.log('Discovered issuer %s %O', issuer.issuer, issuer.metadata);

    const client = new issuer.Client({
        client_id: process.env.OIDC_CLIENT_ID,
        redirect_uris: [process.env.OIDC_REDIRECT_URIS],
        response_types: ['id_token'],
        // id_token_signed_response_alg (default "RS256")
    })
    const nonce = generators.nonce();

    app.get('/', async function (req, res) {
        let url = client.authorizationUrl({
            redirect_uri: process.env.CLIENT_URL + '/cb',
            scope: 'openid',
            response_mode: 'form_post',
            nonce,
        });

        res.redirect(url);
    });
    app.post('/cb', async function (req, res) {
        const params = client.callbackParams(req);
        const tokenSet = await client.callback(process.env.CLIENT_URL + '/cb', params, {nonce});
        console.log('received and validated tokens %j', tokenSet);
        console.log('validated ID Token claims %j', tokenSet.claims());
        res.send(tokenSet.claims());
    });

    app.listen(3000);
}

run().catch(console.dir);