libredirect/background.js

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JavaScript
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'use strict';
const invidiousDefault = 'https://invidio.us';
const youtubeDomains = [
'm.youtube.com',
'youtube.com',
'img.youtube.com',
'www.youtube.com',
'youtube-nocookie.com',
'www.youtube-nocookie.com',
'youtu.be',
's.ytimg.com',
];
const nitterDefault = 'https://nitter.net';
const twitterDomains = [
'twitter.com',
'www.twitter.com',
'mobile.twitter.com',
'pbs.twimg.com',
'video.twimg.com',
];
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const bibliogramDefault = 'https://bibliogram.art';
const instagramRegex = /((www|about|help)\.)?instagram\.com/;
const instagramPathsRegex = /\/(a|admin|api|favicon.ico|static|imageproxy|p|u|developer|about|legal|explore|director)/;
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const osmDefault = 'https://openstreetmap.org';
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const googleMapsRegex = /https?:\/\/(((www|maps)\.)?(google).*(\/maps)|maps\.(google).*)/;
const mapCentreRegex = /@(-?\d[0-9.]*),(-?\d[0-9.]*),(\d{1,2})[.z]/;
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const dataLatLngRegex = /(!3d|!4d)(-?[0-9]{1,10}.[0-9]{1,10})/g;
const placeRegex = /\/place\/(.*)\//;
const travelModes = {
'driving': 'fossgis_osrm_car',
'walking': 'fossgis_osrm_foot',
'bicycling': 'fossgis_osrm_bike',
'transit': 'fossgis_osrm_car' // not implemented on OSM, default to car.
};
const layers = {
'none': 'S',
'transit': 'T',
'traffic': 'S', // not implemented on OSM, default to standard.
'bicycling': 'C'
}
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let disableNitter;
let disableInvidious;
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let disableBibliogram;
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let disableOsm;
let nitterInstance;
let invidiousInstance;
let bibliogramInstance;
let osmInstance;
let alwaysProxy;
let onlyEmbeddedVideo;
let videoQuality;
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window.browser = window.browser || window.chrome;
browser.storage.sync.get(
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[
'nitterInstance',
'invidiousInstance',
'bibliogramInstance',
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'osmInstance',
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'disableNitter',
'disableInvidious',
'disableBibliogram',
'disableOsm',
'alwaysProxy',
'onlyEmbeddedVideo',
'videoQuality'
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],
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result => {
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disableNitter = result.disableNitter;
disableInvidious = result.disableInvidious;
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disableBibliogram = result.disableBibliogram;
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disableOsm = result.disableOsm;
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nitterInstance = result.nitterInstance || nitterDefault;
invidiousInstance = result.invidiousInstance || invidiousDefault;
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bibliogramInstance = result.bibliogramInstance || bibliogramDefault;
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osmInstance = result.osmInstance || osmDefault;
alwaysProxy = result.alwaysProxy;
onlyEmbeddedVideo = result.onlyEmbeddedVideo;
videoQuality = result.videoQuality;
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}
);
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browser.storage.onChanged.addListener(changes => {
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if ('nitterInstance' in changes) {
nitterInstance = changes.nitterInstance.newValue || nitterDefault;
}
if ('invidiousInstance' in changes) {
invidiousInstance = changes.invidiousInstance.newValue || invidiousDefault;
}
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if ('bibliogramInstance' in changes) {
bibliogramInstance = changes.bibliogramInstance.newValue || bibliogramDefault;
}
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if ('osmInstance' in changes) {
osmInstance = changes.osmInstance.newValue || osmDefault;
}
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if ('disableNitter' in changes) {
disableNitter = changes.disableNitter.newValue;
}
if ('disableInvidious' in changes) {
disableInvidious = changes.disableInvidious.newValue;
}
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if ('disableBibliogram' in changes) {
disableBibliogram = changes.disableBibliogram.newValue;
}
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if ('disableOsm' in changes) {
disableOsm = changes.disableOsm.newValue;
}
if ('alwaysProxy' in changes) {
alwaysProxy = changes.alwaysProxy.newValue;
}
if ('onlyEmbeddedVideo' in changes) {
onlyEmbeddedVideo = changes.onlyEmbeddedVideo.newValue;
}
if ('videoQuality' in changes) {
videoQuality = changes.videoQuality.newValue;
}
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});
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function addressToLatLng(address, callback) {
const xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = () => {
if (xmlhttp.readyState === XMLHttpRequest.DONE) {
if (xmlhttp.status === 200) {
const json = JSON.parse(xmlhttp.responseText)[0];
if (json) {
callback(
`${json.lat}%2C${json.lon}`,
`${json.boundingbox[2]},${json.boundingbox[1]},${json.boundingbox[3]},${json.boundingbox[0]}`
);
}
}
else {
console.info("Error: Status is " + xmlhttp.status);
}
}
};
xmlhttp.open(
'GET',
`https://nominatim.openstreetmap.org/search/${address}?format=json&limit=1`,
false
);
xmlhttp.send();
}
function redirectYouTube(url, type) {
if (disableInvidious) {
return null;
}
if (url.pathname.match(/iframe_api/)) {
// Redirect requests for YouTube Player API to local files instead
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return browser.runtime.getURL('assets/iframe_api.js');
} else if (url.pathname.match(/www-widgetapi/)) {
// Redirect requests for YouTube Player API to local files instead
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return browser.runtime.getURL('assets/www-widgetapi.js');
} else {
// Proxy video through the server if enabled by user
if (alwaysProxy) {
url.searchParams.append('local', true);
}
if (videoQuality) {
url.searchParams.append('quality', videoQuality);
}
if (onlyEmbeddedVideo && type !== 'sub_frame') {
return null;
}
return `${invidiousInstance}${url.pathname}${url.search}`;
}
}
function redirectTwitter(url) {
if (disableNitter) {
return null;
}
if (url.host.split('.')[0] === 'pbs') {
return `${nitterInstance}/pic/${encodeURIComponent(url.href)}`;
} else if (url.host.split('.')[0] === 'video') {
return `${nitterInstance}/gif/${encodeURIComponent(url.href)}`;
} else {
return `${nitterInstance}${url.pathname}${url.search}`;
}
}
function redirectInstagram(url) {
if (disableBibliogram) {
return null;
}
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if (url.pathname === '/' || url.pathname.match(instagramPathsRegex)) {
return `${bibliogramInstance}${url.pathname}${url.search}`;
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} else {
// Redirect user profile requests to '/u/...'
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return `${bibliogramInstance}/u${url.pathname}${url.search}`;
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}
}
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function redirectGoogleMaps(url) {
if (disableOsm) {
return null;
}
let redirect;
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let mapCentre = '';
let params = '';
// Set map centre if present
if (url.pathname.match(mapCentreRegex)) {
const [, lat, lon, zoom] = url.pathname.match(mapCentreRegex);
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mapCentre = `#map=${zoom}/${lat}/${lon}`;
} else if (url.search.includes('center=')) {
const [lat, lon] = url.searchParams.get('center').split(',');
mapCentre = `#map=${url.searchParams.get('zoom') || '17'}/${lat}/${lon}`;
// Set default zoom if mapCentre not present
} else {
params = '&zoom=17';
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}
// Set map layer
params = `${params}&layers=${layers[url.searchParams.get('layer')] || layers['none']}`;
// Handle Google Maps Embed API
if (url.pathname.includes('/embed')) {
const query = url.searchParams.get('q') || url.searchParams.get('query');
let marker, bbox;
addressToLatLng(query, (coords, boundingbox) => {
marker = coords;
bbox = boundingbox;
});
redirect = `${osmInstance}/export/embed.html?bbox=${bbox}&layer=mapnik&marker=${marker}`;
// Handle Google Maps Directions
} else if (url.pathname.includes('/dir')) {
const travelMode = travelModes[url.searchParams.get('travelmode')] || travelModes['driving'];
let origin;
addressToLatLng(url.searchParams.get('origin'), coords => {
origin = coords;
});
let destination;
addressToLatLng(url.searchParams.get('destination'), coords => {
destination = coords;
});
redirect = `${osmInstance}/directions?engine=${travelMode}&route=${origin}%3B${destination}${mapCentre}${params}`;
// Get marker from data attribute
} else if (url.pathname.includes('data=') && url.pathname.match(dataLatLngRegex)) {
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const [mlat, mlon] = url.pathname.match(dataLatLngRegex);
redirect = `${osmInstance}/?mlat=${mlat.replace('!3d', '')}&mlon=${mlon.replace('!4d', '')}${mapCentre}${params}`;
// Get marker from ll param
} else if (url.searchParams.has('ll')) {
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const [mlat, mlon] = url.searchParams.get('ll').split(',');
redirect = `${osmInstance}/?mlat=${mlat}&mlon=${mlon}${mapCentre}${params}`;
// Get marker from viewpoint param.
} else if (url.searchParams.has('viewpoint')) {
const [mlat, mlon] = url.searchParams.get('viewpoint').split(',');
redirect = `${osmInstance}/?mlat=${mlat}&mlon=${mlon}${mapCentre}${params}`;
// Use query as search if present.
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} else {
let query;
if (url.searchParams.has('q')) {
query = url.searchParams.get('q');
} else if (url.searchParams.has('query')) {
query = url.searchParams.get('query');
} else if (url.pathname.match(placeRegex)) {
query = url.pathname.match(placeRegex)[1];
}
redirect = `${osmInstance}/${query ? 'search?query=' + query : ''}${mapCentre || '#'}${params}`;
}
return redirect;
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}
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browser.webRequest.onBeforeRequest.addListener(
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details => {
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const url = new URL(details.url);
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let redirect;
if (youtubeDomains.includes(url.host)) {
redirect = {
redirectUrl: redirectYouTube(url, details.type)
};
} else if (twitterDomains.includes(url.host)) {
redirect = {
redirectUrl: redirectTwitter(url)
};
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} else if (url.host.match(instagramRegex)) {
redirect = {
redirectUrl: redirectInstagram(url)
};
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} else if (url.href.match(googleMapsRegex)) {
redirect = {
redirectUrl: redirectGoogleMaps(url)
};
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}
if (redirect && redirect.redirectUrl) {
console.info(
'Redirecting', `"${url.href}"`, '=>', `"${redirect.redirectUrl}"`
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);
console.info('Details', details);
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}
return redirect;
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},
{
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urls: ["<all_urls>"]
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},
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['blocking']
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);