User:Suffusion of Yellow/AnonSettings/sw.js
Appearance
Code that you insert on this page could contain malicious content capable of compromising your account. If you import a script from another page with "importScript", "mw.loader.load", "iusc", or "lusc", take note that this causes you to dynamically load a remote script, which could be changed by others. Editors are responsible for all edits and actions they perform, including by scripts. User scripts are not centrally supported and may malfunction or become inoperable due to software changes. A guide to help you find broken scripts is available. If you are unsure whether code you are adding to this page is safe, you can ask at the appropriate village pump. This code will be executed when previewing this page. |
Documentation for this user script can be added at User:Suffusion of Yellow/AnonSettings/sw. |
// DO NOT INSTALL THIS IN YOUR common.js!
const DEFAULT_SETTINGS = {
skin : "vector",
nologin : true
};
const CONFIG_SRC = "https://en.wikipedia.org/w/index.php?title=User:Suffusion_of_Yellow/AnonSettings/config.js&action=raw&ctype=text/javascript";
function saveSettings(settings) {
return self.caches.open("anonsettings")
.then(cache => cache.put("/anonsettings/data", new Response(JSON.stringify(settings))));
}
function getSettings() {
return self.caches.open("anonsettings")
.then(cache => cache.match("/anonsettings/data"))
.then(settings => settings ? settings.json() : DEFAULT_SETTINGS);
}
function injectSettingsScript(response, settings) {
return response.text()
.then(text => new Response(text.replace(
/<\/body>\s*<\/html>\s*$/,
`<script>const ANON_SETTINGS=${JSON.stringify(settings)};</script><script src="${CONFIG_SRC}"></script>$&`), {
headers : response.headers
}));
}
function getResponse(event, url, settings) {
// Unregister if attempting to log in
if (settings.nologin && url.pathname == "/w/index.php" && url.searchParams.get("title") == "Special:UserLogin") {
return self.registration.unregister()
.then(() => fetch(event.request));
}
if (settings.skin && !url.searchParams.get("useskin"))
url.searchParams.set("useskin", settings.skin);
if (settings.lang && !url.searchParams.get("uselang"))
url.searchParams.set("uselang", settings.lang);
if (settings.gadget && !url.searchParams.get("withgadget"))
url.searchParams.set("withgadget", settings.gadget);
let options = {};
for (let option of ["method", "headers", "credentials", "cache", "redirect", "referrer", "referrerPolicy", "integrity"])
if (option in event.request)
options[option] = event.request[option];
if (url.pathname == "/wiki/User:Suffusion_of_Yellow/AnonSettings/Setup") {
return fetch(new Request(url, options))
.then(response => injectSettingsScript(response, settings))
.catch(e => getErrorResponse(e));
}
if (event.request.method == "GET" || event.request.method == "HEAD")
return fetch(new Request(url, options)).catch(e => getErrorResponse(e));
return event.request.blob()
.then(body => {
options.body = body;
return fetch(new Request(url, options)).catch(e => getErrorResponse(e));
});
}
function getErrorResponse(err) {
if (!self.navigator.userAgent.includes("Firefox"))
return null; // Trigger network error in client
// Apparently Firefox will "helpfully" remove the ServiceWorker after
// too many network errors. So send a fake 503 response instead.
return new Response(`AnonSettings: ${err}`, {
status: 503
});
}
// Flush out any buggy old versions, at least while still in development
self.addEventListener('install', event => {
self.skipWaiting();
});
self.addEventListener('activate', event => {
event.waitUntil(self.clients.claim());
});
self.addEventListener('message', event => {
if (event.data && event.data.settings)
event.waitUntil(saveSettings(event.data.settings));
});
self.addEventListener('fetch', event => {
let url = new URL(event.request.url);
if (url.origin !== self.location.origin)
return;
// Safe mode means "no user scripts", which I guess should include this one
if (url.searchParams.get("safemode"))
return;
// Hack to detect an already logged-in session. This is the only
// non-"navigate" request we look at and we don't modify it
if (url.pathname == "/w/load.php" && url.searchParams.get("modules") && url.searchParams.get("modules").split("|").includes("user")) {
event.waitUntil(getSettings().then(settings => {
if (settings.nologin)
self.registration.unregister();
}));
return;
}
// Ignore JS, CSS, etc.
if (event.request.mode !== "navigate")
return;
// Don't add irritating warnings to every API help page...
if (!url.pathname.match(/^\/w\/index.php$|^\/$|^\/wiki/))
return;
// Fallback uninstallation link, in case the settings page fails to load
if (url.pathname == "/wiki/User:Suffusion_of_Yellow/AnonSettings/Uninstall" ) {
event.respondWith(self.registration.unregister()
.then(() => Response.redirect("/")));
return;
}
// Default response if offline
if (!self.navigator.onLine)
return;
event.respondWith(getSettings().then(settings => getResponse(event, url, settings)));
});
// DO NOT INSTALL THIS IN YOUR common.js!