mirror of https://github.com/mifi/lossless-cut
use js expressions instead of mathjs #2002
Mikael Finstad
1 year ago
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096db54f11
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# Expressions
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## Select segments by expression
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LosslessCut has support for normal JavaScript expressions. You will be given a variable `segment` and can create an expression that returns `true` or `false`. For example to select all segments with a duration of less than 5 seconds use this expression:
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```js
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segment.duration < 5
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```
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See more examples in-app.
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const workerUrl = new URL('evalWorker.js', import.meta.url);
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// https://v3.vitejs.dev/guide/features.html#web-workers
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// todo terminate() and recreate in case of error?
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const worker = new Worker(workerUrl);
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let lastRequestId = 0;
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export default async function safeishEval(code: string, context: unknown) {
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return new Promise((resolve, reject) => {
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lastRequestId += 1;
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const id = lastRequestId;
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// console.log({ lastRequestId, code, context })
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function cleanup() {
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// eslint-disable-next-line no-use-before-define
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worker.removeEventListener('message', onMessage);
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// eslint-disable-next-line no-use-before-define
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worker.removeEventListener('messageerror', onMessageerror);
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// eslint-disable-next-line no-use-before-define
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worker.removeEventListener('error', onError);
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}
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function onMessage({ data: { id: responseId, error, data } }) {
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// console.log('message', { responseId, error, data })
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if (responseId === id) {
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cleanup();
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if (error) reject(new Error(error));
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else resolve(data);
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}
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}
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function onMessageerror() {
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cleanup();
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reject(new Error('safeishEval messageerror'));
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}
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function onError(err: ErrorEvent) {
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cleanup();
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reject(new Error(`safeishEval error: ${err.message}`));
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}
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worker.addEventListener('message', onMessage);
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worker.addEventListener('messageerror', onMessageerror);
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worker.addEventListener('error', onError);
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worker.postMessage({ id, code, context: JSON.stringify(context) });
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});
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}
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@ -0,0 +1,138 @@
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// eslint-disable-next-line unicorn/no-this-assignment, @typescript-eslint/no-this-alias
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const myGlobal = this;
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// https://stackoverflow.com/a/10796616/6519037
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// https://github.com/Zirak/SO-ChatBot/blob/master/source/eval.js
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// https://github.com/Zirak/SO-ChatBot/blob/master/source/codeWorker.js
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const wl = {
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self: 1,
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onmessage: 1,
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postMessage: 1,
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global: 1,
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wl: 1,
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eval: 1,
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Array: 1,
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Boolean: 1,
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Date: 1,
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Function: 1,
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Number: 1,
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Object: 1,
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RegExp: 1,
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String: 1,
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Error: 1,
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EvalError: 1,
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RangeError: 1,
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ReferenceError: 1,
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SyntaxError: 1,
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TypeError: 1,
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URIError: 1,
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decodeURI: 1,
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decodeURIComponent: 1,
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encodeURI: 1,
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encodeURIComponent: 1,
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isFinite: 1,
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isNaN: 1,
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parseFloat: 1,
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parseInt: 1,
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Infinity: 1,
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JSON: 1,
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Math: 1,
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NaN: 1,
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undefined: 1,
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// Chrome errors if you attempt to write over either of these properties, so put them in the whitelist
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// https://github.com/owl-factory/lantern/blob/addda28034d5d30a7ea720646aa56fefa8f05cf4/archive/src/nodes/sandbox/workers/sandboxed-code.worker.ts#L47
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TEMPORARY: 1,
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PERSISTENT: 1,
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};
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// eslint-disable-next-line prefer-arrow-callback, func-names
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Object.getOwnPropertyNames(myGlobal).forEach(function (prop) {
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// eslint-disable-next-line no-prototype-builtins
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if (!wl.hasOwnProperty(prop)) {
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Object.defineProperty(myGlobal, prop, {
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// eslint-disable-next-line func-names, object-shorthand
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get: function () {
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// eslint-disable-next-line no-throw-literal
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throw `Security Exception: cannot access ${prop}`;
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},
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configurable: false,
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});
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}
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});
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// eslint-disable-next-line no-proto, prefer-arrow-callback, func-names
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Object.getOwnPropertyNames(myGlobal.__proto__).forEach(function (prop) {
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// eslint-disable-next-line no-prototype-builtins
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if (!wl.hasOwnProperty(prop)) {
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// eslint-disable-next-line no-proto
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Object.defineProperty(myGlobal.__proto__, prop, {
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// eslint-disable-next-line func-names, object-shorthand
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get: function () {
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// eslint-disable-next-line no-throw-literal
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throw `Security Exception: cannot access ${prop}`;
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},
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configurable: false,
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});
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}
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});
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// Array(5000000000).join("adasdadadasd") instantly crashing some browser tabs
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// eslint-disable-next-line no-extend-native
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Object.defineProperty(Array.prototype, 'join', {
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writable: false,
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configurable: false,
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enumerable: false,
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// eslint-disable-next-line wrap-iife, func-names
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value: function (old) {
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// eslint-disable-next-line func-names
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return function (arg) {
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// @ts-expect-error dunno how to fix
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if (this.length > 500 || (arg && arg.length > 500)) {
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// eslint-disable-next-line no-throw-literal
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throw 'Exception: too many items';
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}
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// eslint-disable-next-line unicorn/prefer-reflect-apply, prefer-rest-params
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// @ts-expect-error dunno how to fix
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return old.apply(this, arg);
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};
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}(Array.prototype.join),
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});
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/*
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https://github.com/Zirak/SO-ChatBot/blob/accbfb4b8738781afaf4f080a6bb0337e13f7c25/source/codeWorker.js#L87
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DOM specification doesn't define an enumerable `fetch` function object on
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the global object so we add the property here, and the following code will
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blacklist it. (`fetch` descends from `GlobalFetch`, and is thus present in
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worker code as well)
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Just in case someone runs the bot on some old browser where `fetch` is not
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defined anyways, this will have no effect.
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Reason for blacklisting fetch: well, same as XHR.
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*/
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// @ts-expect-error expected
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myGlobal.fetch = undefined;
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// eslint-disable-next-line wrap-iife, func-names
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(function () {
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onmessage = (event) => {
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// eslint-disable-next-line strict, lines-around-directive
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'use strict';
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const { code, id, context: contextStr } = event.data;
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const context = { ...JSON.parse(contextStr) };
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try {
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// https://stackoverflow.com/questions/8403108/calling-eval-in-particular-context
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// eslint-disable-next-line unicorn/new-for-builtins, no-new-func
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const result = Function(`\nwith (this) { return (${code}); }`).call(context);
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postMessage({ id, data: result });
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} catch (e) {
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postMessage({ id, error: `${e}` });
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}
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};
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})();
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