infinity-auth-example.js

const express = require("express");
const querystring = require("querystring");
const session = require("express-session");

const app = express();
const port = 8080;
const url = `http://localhost:${port}`;
const oauthServer = "https://app.startinfinity.com";

const appId = "<paste-app-id>";
const appSecret = "<paste-app-scret>";
const callbackUrl = `${url}/callback`;

app.use(session({ secret: "keyboard cat", cookie: { maxAge: 60000 } }));

app.get("/redirect", (req, res) => {
  const state = "<generate-random-string-token>";
  req.session.state = state;

  const query = querystring.stringify({
    client_id: appId,
    redirect_uri: callbackUrl,
    response_type: "code",
    scope: "",
    state: state,
  });

  res.redirect(`${oauthServer}/oauth/authorize?${query}`);
});

app.get("/callback", async (req, res) => {
  if (req.session.state !== req.query.state) {
    throw Error("States do not match");
  }
  const data = {
    grant_type: "authorization_code",
    client_id: appId,
    client_secret: appSecret,
    redirect_uri: callbackUrl,
    code: req.query.code,
  };
  const response = await fetch(`${oauthServer}/oauth/token`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    redirect: "follow",
    body: JSON.stringify(data),
  });

  const token = await response.json();

  res.json(token);
});

app.listen(port, () => {
  console.log(`Example app listening at ${url}`);
});

  const response = await fetch('https://app.startinfinity.com/oauth/token/refresh', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    redirect: 'follow',
    body: JSON.stringify({
       refresh_token: token.refresh_token
    }),
  });