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/*
GoToSocial
Copyright (C) GoToSocial Authors admin@gotosocial.org
SPDX-License-Identifier: AGPL-3.0-or-later
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
const explanation = "Your browser is currently solving a proof-of-work challenge designed to deter \"ai\" scrapers. This should take no more than a few seconds...";
document.addEventListener("DOMContentLoaded", function() {
// Get the nollamas section container.
const nollamas = document.querySelector(".nollamas");
// Add some "loading" text to show that
// a proof-of-work captcha is being done.
const p = this.createElement("p");
p.className = "nollamas-explanation";
p.appendChild(document.createTextNode(explanation));
nollamas.appendChild(p);
// Add a loading spinner, but only
// animate it if motion is allowed.
const spinner = document.createElement("i");
spinner.className = "fa fa-spinner fa-2x fa-fw nollamas-status";
if (!window.matchMedia('(prefers-reduced-motion: reduce)').matches) {
spinner.className += " fa-pulse";
}
spinner.setAttribute("title","Solving...");
spinner.setAttribute("aria-label", "Solving");
nollamas.appendChild(spinner);
// Read the challenge and difficulty from
// data attributes on the nollamas section.
const seed = nollamas.dataset.nollamasSeed;
const challenge = nollamas.dataset.nollamasChallenge;
const threads = navigator.hardwareConcurrency;
if (typeof(threads) != "number" || threads < 1) { threads = 1; }
console.log("seed:", seed); // eslint-disable-line no-console
console.log("challenge:", challenge); // eslint-disable-line no-console
console.log("threads:", threads); // eslint-disable-line no-console
// Create an array to track
// all workers such that we
// can terminate them all.
const workers = [];
const terminateAll = () => { workers.forEach((worker) => worker.terminate() ); };
// Get time before task completion.
const startTime = performance.now();
// Prepare and start each worker,
// adding them to the workers array.
for (let i = 0; i < threads; i++) {
const worker = new Worker("/assets/dist/nollamasworker.js");
workers.push(worker);
// On any error terminate.
worker.onerror = (ev) => {
console.error("worker error:", ev); // eslint-disable-line no-console
terminateAll();
};
// Post worker message, where each
// worker will compute nonces in range:
// $threadNumber + $totalThreads * n
worker.postMessage({
challenge: challenge,
threads: threads,
thread: i,
seed: seed,
});
// Set main on-success function.
worker.onmessage = function (e) {
if (e.data.done) {
// Stop workers.
terminateAll();
// Log which thread found the solution.
console.log("solution from:", e.data.thread); // eslint-disable-line no-console
// Get total computation duration.
const endTime = performance.now();
const duration = endTime - startTime;
// Remove spinner and replace it with a tick
// and info about how long it took to solve.
nollamas.removeChild(spinner);
const solutionWrapper = document.createElement("div");
solutionWrapper.className = "nollamas-status";
const tick = document.createElement("i");
tick.className = "fa fa-check fa-2x fa-fw";
tick.setAttribute("title","Solved!");
tick.setAttribute("aria-label", "Solved!");
solutionWrapper.appendChild(tick);
const took = document.createElement("span");
const solvedText = `Solved after ${e.data.nonce} iterations by worker ${e.data.thread} of ${threads}, in ${duration.toString()}ms!`;
took.appendChild(document.createTextNode(solvedText));
solutionWrapper.appendChild(took);
nollamas.appendChild(solutionWrapper);
// Wait for 500ms before redirecting, to give
// visitors a shot at reading the message, but
// not so long that they have to wait unduly.
setTimeout(() => {
let url = new URL(window.location.href);
url.searchParams.set("nollamas_solution", e.data.nonce);
window.location.replace(url.toString());
}, 500);
}
};
}
});
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