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/**
* GNU LibreJS - A browser add-on to block nonfree nontrivial JavaScript.
*
* Copyright (C) 2018 Giorgio Maone <giorgio@maone.net>
* Copyright (C) 2022 Yuchen Pei <id@ypei.org>
*
* This file is part of GNU LibreJS.
*
* GNU LibreJS is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNU LibreJS 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU LibreJS. If not, see <http://www.gnu.org/licenses/>.
*/
"use strict";
{
// Find and fetch the url to the web labels table, and returns the
// license info in the table as a map from the script url to
// { script: {url, label},
// licenseLinks: [{url, label}],
// sources: [{url, label}] }
//
// see https://www.gnu.org/software/librejs/free-your-javascript.html#step3
const fetchWebLabels = async args => {
const { map, cache } = args;
const link = document.querySelector(`link[rel="jslicense"], link[data-jslicense="1"], a[rel="jslicense"], a[data-jslicense="1"]`);
const baseURL = link ? link.href : cache.webLabels && new URL(cache.webLabels.href, document.baseURI);
if (baseURL) try {
const response = await fetch(baseURL);
if (!response.ok) throw `${response.status} ${response.statusText}`;
const doc = new DOMParser().parseFromString(
await response.text(),
"text/html"
);
const link = a => ({ url: a.href, label: a.textContent });
const firstLink = parent => link(parent.querySelector("a"));
const allLinks = parent => Array.prototype.map.call(parent.querySelectorAll("a"), link);
for (const row of doc.querySelectorAll("table#jslicense-labels1 > tbody > tr")) {
try {
const cols = row.querySelectorAll("td");
const script = firstLink(cols[0]);
const licenseLinks = allLinks(cols[1]);
const sources = cols[2] ? allLinks(cols[2]) : [];
map.set(script.url, { script, licenseLinks, sources });
} catch (e) {
console.error("LibreJS: error parsing Web Labels at %s, row %s", baseURL, row.innerHTML, e);
}
}
} catch (e) {
console.error("Error fetching Web Labels at %o", link, e);
}
return map;
}
const fetchLicenseInfo = async cache => {
const map = new Map();
const args = { map, cache };
// in the fetchXxx methods we add to a map whatever license(s)
// URLs and source code references we can find in various formats
// (WebLabels is currently the only implementation), keyed by script URLs.
await Promise.all([
fetchWebLabels(args),
// fetchXmlSpdx(args),
// fetchTxtSpdx(args),
// ...
]);
return map;
}
const handlers = {
// Look up the script url in the web labels and return it if found,
// otherwise return undefined. The found value is of the format
// { script: {url, label},
// licenseLinks: [{url, label}],
// sources: [{url, label}] }
async checkLicensedScript(m) {
const { url, cache } = m;
const licensedScripts = await fetchLicenseInfo(cache);
return licensedScripts.get(url) || licensedScripts.get(url.replace(/\?.*/, ''));
}
}
browser.runtime.onMessage.addListener(async m => {
if (m.action in handlers) try {
debug("Received message", m);
const result = await handlers[m.action](m);
return result;
} catch (e) {
console.error(e);
}
});
}
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