web/js/auth.js

/*
Auth process: User Requests Key => Server emails key to user =>
              user opens link to auth.html =>
              website POSTs key to server => Server checks validity =>
              Server responds with the users auth key =>
              auth.js adds this to localStorage
*/
const cmd = document.getElementById("cmd") // Assign element to const
init(); // Run init function

async function sendHome(){
    await delay(2000);
    location.replace('/')
}

async function cmdOut(message) {
    html = "<p>" + message + "</p>"
    cmd.insertAdjacentHTML("beforeend", html)
}

async function registerKey(key) { // Posts key to server and listens for response.
    const url = `${window.location.origin}/api/v1/register/register`;
    const res = await fetch(url, { // The response will contain the UUID which will be registered
        method: "POST",
        headers: {
          "Content-Type": "application/json"
        },
        redirect: "follow",
        body: JSON.stringify({uuid: key})
    })
    const data = await res.json();
    return res.status === 201
        ? (localStorage.setItem("uuid", data.api_key), true)
        : false;
}

async function checkAuth(key) {
    const url = `${window.location.origin}/api/v1/auth/test`;
    const res = await fetch(url, {
        method: "GET",
        redirect: "follow",
        headers: {
            "uuid": key
        }
    })
    return res.status === 200 ? true : false
}

async function init(){ // Reads registration key from query, and calls registerKey(key)
  cmdOut("Reading authorisation code");
  const key = await getQuery("key");
  cmdOut("Requesting API Key from server");
  if (!await registerKey(key)) {
    cmdOut("Failed to register key")
    hideLoading()
    return
  }
  showLoading()
  if (! await checkAuth(localStorage.getItem("uuid"))) {
    cmdOut("Authentication Check failed")
    cmdOut("Please try again")
    hideLoading()
    await delay(2000)
    location.replace("./")
  }
  hideLoading();
  cmdOut("Authentication succesful")
  await delay(2000)
  location.replace("./")
}