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it's nice when important code is commented

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This commit is contained in:
ansuz 2022-01-21 17:44:09 +05:30
parent c438f0ba10
commit 23e47032bf
1 changed files with 29 additions and 2 deletions
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31
www/bounce/main.js
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@ -1,27 +1,46 @@
define(['/api/config'], function (ApiConfig) {
/* The 'bounce app' provides a unified way to do the following things in CryptPad
1. remove the 'opener' attribute from the tab/window every time you navigate
2. detect and block malicious URLs after warning the user
3. inform users when they are navigating away from their cryptpad instance
*/
// when a URL is rejected we close the window
var reject = function () {
window.close();
};
// this app is intended to be loaded and used exclusively from the sandbox domain
// where stricter CSP blocks various attacks. Reject any other usage.
if (ApiConfig.httpSafeOrigin !== window.location.origin) {
window.alert('The bounce application must only be used from the sandbox domain, ' +
'please report this issue on https://github.com/xwiki-labs/cryptpad');
return;
return void reject();
}
// Old/bad browsers lack the URL API, making it more difficult to validate and compare URLs.
// Warn and reject.
if (typeof(URL) !== 'function') {
window.alert("Your browser does not support functionality this page requires");
return void reject();
}
// remove the 'opener' to prevent 'reverse tabnabbing'.
window.opener = null;
// Parse the outer domain's root URL to facilitate comparisons.
// Reject everything if this fails to parse.
var host;
try {
host = new URL('', ApiConfig.httpUnsafeOrigin);
} catch (err) {
window.alert("This server is configured incorrectly. Its administrator should check its diagnostics page");
window.alert("This server is configured incorrectly. Details for its administrator can be found on its diagnostics page.");
return void reject();
}
// Decode the target URL that should have been provided through the document's hash.
// Reject if no URL was provided.
// Absolute URLs are easy to handle, other consider URLs relative to the outer domain.
var target;
try {
var bounceTo = decodeURIComponent(window.location.hash.slice(1));
@ -32,21 +51,29 @@ define(['/api/config'], function (ApiConfig) {
return void reject();
}
// Valid links should navigate to the normalized href
var go = function () {
window.location.href = target.href;
};
// Local URLs don't require any warning and can navigate directly without user input.
if (target.host === host.host) { return void go(); }
// Everything else requires user input, so we load the platform's translations.
// FIXME: this seems to infer language preferences from the browser instead of the user's account preferences
require([
'/customize/messages.js',
], function (Messages) {
// The provided URL seems to be a malicious or invalid payload.
// Inform the user that we won't navigate and that the 'bounce tab' will be closed.
if (['javascript:', 'vbscript:', 'data:', 'blob:'].includes(target.protocol)) {
window.alert(Messages._getKey('bounce_danger', [target.href]));
return void reject();
}
// The provided URL will navigate the user away from the outer domain.
var question = Messages._getKey('bounce_confirm', [host.hostname, target.href]);
// Confirm that they want to leave, then navigate or reject based on their choice.
var answer = window.confirm(question);
if (answer) { return void go(); }
reject();