99 lines
2.2 KiB
JavaScript
99 lines
2.2 KiB
JavaScript
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// This WebWorker provides a safe environment to run user scripts
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// See http://stackoverflow.com/questions/10653809/making-webworkers-a-safe-environment/10796616
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import Handlebars from 'handlebars';
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// Classeur own helpers
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Handlebars.registerHelper('tocToHtml', (toc, depth = 6) => {
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function arrayToHtml(arr) {
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if (!arr || !arr.length || arr[0].level > depth) {
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return '';
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}
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const ulHtml = arr.map((item) => {
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let result = '<li>';
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if (item.anchor && item.title) {
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result += `<a href="#${item.anchor}">${item.title}</a>`;
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}
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result += arrayToHtml(item.children);
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return `${result}</li>`;
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}).join('\n');
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return `\n<ul>\n${ulHtml}\n</ul>\n`;
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}
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return new Handlebars.SafeString(arrayToHtml(toc));
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});
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const whiteList = {
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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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whiteList: 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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safeEval: 1,
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close: 1,
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Handlebars: 1,
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};
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let global = self;
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while (global !== Object.prototype) {
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Object.getOwnPropertyNames(global).forEach((prop) => { // eslint-disable-line no-loop-func
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if (!Object.prototype.hasOwnProperty.call(whiteList, prop)) {
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try {
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Object.defineProperty(global, prop, {
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get() {
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throw new Error(`Security Exception: cannot access ${prop}`);
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},
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configurable: false,
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});
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} catch (e) {
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// Ignore
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}
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}
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});
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global = Object.getPrototypeOf(global);
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}
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function safeEval(code) {
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eval(`"use strict";\n${code}`); // eslint-disable-line no-eval
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}
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self.onmessage = (evt) => {
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try {
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const template = Handlebars.compile(evt.data[0]);
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const context = evt.data[1];
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safeEval(evt.data[2]);
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self.postMessage([null, template(context)]);
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} catch (e) {
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self.postMessage([e.toString()]);
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}
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close();
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};
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