authelia/internal/suites/example/compose/duo-api/duo_api.js

/*
 * This is a script to fake the Duo API for push notifications.
 *
 * For Auth API access is allowed by default but one can change the
 * behavior at runtime by POSTing to /allow or /deny. Then the /auth/v2/auth
 * endpoint will act accordingly.
 *
 * For PreAuth API device selection is bypassed by default but one can
 * change the behavior at runtime by POSTing to /preauth using the desired
 * result parameters (and devices). Then the /auth/v2/preauth endpoint
 * will act accordingly.
 */

const express = require("express");
const app = express();
const port = 3000;

app.use(express.json());
app.set("trust proxy", true);

// Auth API
let permission = "allow";

app.post("/allow", (req, res) => {
  permission = "allow";
  console.log("auth set allowed!");
  res.send("ALLOWED");
});

app.post("/deny", (req, res) => {
  permission = "deny";
  console.log("auth set denied!");
  res.send("DENIED");
});

app.post("/auth/v2/auth", (req, res) => {
  setTimeout(() => {
    let response;
    if (permission == "allow") {
      response = {
        response: {
          result: "allow",
          status: "allow",
          status_msg: "The user allowed access.",
        },
        stat: "OK",
      };
    } else {
      response = {
        response: {
          result: "deny",
          status: "deny",
          status_msg: "The user denied access.",
        },
        stat: "OK",
      };
    }
    res.json(response);
    console.log("Auth API responded with %s", permission);
  }, 2000);
});

// PreAuth API
let preauth = {
  result: "allow",
  status_msg: "Allowing unknown user",
};

app.post("/preauth", (req, res) => {
  preauth = req.body;
  console.log("set result to: %s", preauth);
  res.json(preauth);
});

app.post("/auth/v2/preauth", (req, res) => {
  setTimeout(() => {
    let response;
    response = {
      response: preauth,
      stat: "OK",
    };

    res.json(response);
    console.log("PreAuth API responded with %s", preauth);
  }, 2000);
});

app.listen(port, () => console.log(`Duo API listening on port ${port}!`));

// The signals we want to handle
// NOTE: although it is tempting, the SIGKILL signal (9) cannot be intercepted and handled
var signals = {
  SIGHUP: 1,
  SIGINT: 2,
  SIGTERM: 15,
};
// Create a listener for each of the signals that we want to handle
Object.keys(signals).forEach((signal) => {
  process.on(signal, () => {
    console.log(`process received a ${signal} signal`);
    process.exit(128 + signals[signal]);
  });
});