105 lines
4.1 KiB
JavaScript
105 lines
4.1 KiB
JavaScript
/**
|
|
* 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 webLabelsUrl = link ? link.href : cache.webLabels && new URL(cache.webLabels.href, document.baseURI);
|
|
if (webLabelsUrl) try {
|
|
const response = await fetch(webLabelsUrl);
|
|
if (!response.ok) throw `${response.status} ${response.statusText}`;
|
|
const doc = new DOMParser().parseFromString(
|
|
await response.text(),
|
|
'text/html'
|
|
);
|
|
// Sets the base url to be the url of the weblabel page if it
|
|
// does not exist. Otherwise relative links on the weblabels
|
|
// page will use the base of the current page.
|
|
if (!doc.querySelector("base")) {
|
|
doc.head.appendChild(doc.createElement("base")).href = webLabelsUrl;
|
|
}
|
|
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", webLabelsUrl, 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);
|
|
}
|
|
});
|
|
}
|