From d8c4d9fc5a62741f0c4c2b692a3a94874714bbcc Mon Sep 17 00:00:00 2001 From: kim Date: Mon, 28 Apr 2025 20:12:27 +0000 Subject: [feature] proof of work scraper deterrence (#4043) This adds a proof-of-work based scraper deterrence to GoToSocial's middleware stack on profile and status web pages. Heavily inspired by https://github.com/TecharoHQ/anubis, but massively stripped back for our own usecase. Todo: - ~~add configuration option so this is disabled by default~~ - ~~fix whatever weirdness is preventing this working with CSP (even in debug)~~ - ~~use our standard templating mechanism going through apiutil helper func~~ - ~~probably some absurdly small performance improvements to be made in pooling re-used hex encode / hash encode buffers~~ the web endpoints aren't as hot a path as API / ActivityPub, will leave as-is for now as it is already very minimal and well optimized - ~~verify the cryptographic assumptions re: using a portion of token as challenge data~~ this isn't a serious application of cryptography, if it turns out to be a problem we'll fix it, but it definitely should not be easily possible to guess a SHA256 hash from the first 1/4 of it even if mathematically it might make it a bit easier - ~~theme / make look nice??~~ - ~~add a spinner~~ - ~~add entry in example configuration~~ - ~~add documentation~~ Verification page originally based on https://github.com/LucienV1/powtect Co-authored-by: tobi Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4043 Reviewed-by: tobi Co-authored-by: kim Co-committed-by: kim --- web/source/nollamas/index.js | 63 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 web/source/nollamas/index.js (limited to 'web/source/nollamas/index.js') diff --git a/web/source/nollamas/index.js b/web/source/nollamas/index.js new file mode 100644 index 000000000..792a5c7f5 --- /dev/null +++ b/web/source/nollamas/index.js @@ -0,0 +1,63 @@ +/* + 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 . +*/ + +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("Your browser is currently solving a proof-of-work challenge designed to deter \"ai\" scrapers. This should take no more than a few seconds...")); + nollamas.appendChild(p); + + // Add a loading spinner as well if motion is allowed. + if (!window.matchMedia('(prefers-reduced-motion: reduce)').matches) { + const i = this.createElement("i"); + i.className = "fa fa-2x fa-spin fa-refresh nollamas-solving"; + i.setAttribute("title","Solving..."); + nollamas.appendChild(i); + } + + // Read the challenge and difficulty from + // data attributes on the nollamas section. + const challenge = nollamas.dataset.nollamasChallenge; + const difficulty = nollamas.dataset.nollamasDifficulty; + + console.log('challenge:', challenge); // eslint-disable-line no-console + console.log('difficulty:', difficulty); // eslint-disable-line no-console + + // Prepare the worker with task function. + const worker = new Worker("/assets/dist/nollamasworker.js"); + worker.postMessage({ + challenge: challenge, + difficulty: difficulty, + }); + + // Set the main worker function. + worker.onmessage = function (e) { + if (e.data.done) { + console.log('solution found for:', e.data.nonce); // eslint-disable-line no-console + let url = new URL(window.location.href); + url.searchParams.set('nollamas_solution', e.data.nonce); + window.location.href = url.toString(); + } + }; +}); -- cgit v1.2.3