tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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ModuleLoader.mjs (1889B)

      1 /**
      2 * Any copyright is dedicated to the Public Domain.
      3 * http://creativecommons.org/publicdomain/zero/1.0/
      4 */
      5 
      6 // This file expectes the SpecialPowers to be available in the scope
      7 // it is loaded into.
      8 /* global SpecialPowers */
      9 
     10 export function ModuleLoader(base, depth, proto) {
     11  const modules = {};
     12 
     13  const principal = SpecialPowers.wrap(document).nodePrincipal;
     14 
     15  const sharedGlobalSandbox = SpecialPowers.Cu.Sandbox(principal, {
     16    invisibleToDebugger: true,
     17    sandboxName: "FS Module Loader",
     18    sandboxPrototype: proto,
     19    wantComponents: false,
     20    wantGlobalProperties: [],
     21    wantXrays: false,
     22  });
     23 
     24  const require = async function (id) {
     25    if (modules[id]) {
     26      return modules[id].exported_symbols;
     27    }
     28 
     29    const url = new URL(depth + id, base);
     30 
     31    const module = Object.create(null, {
     32      exported_symbols: {
     33        configurable: false,
     34        enumerable: true,
     35        value: Object.create(null),
     36        writable: true,
     37      },
     38    });
     39 
     40    modules[id] = module;
     41 
     42    const properties = {
     43      require_module: require,
     44      exported_symbols: module.exported_symbols,
     45    };
     46 
     47    // Create a new object in this sandbox, that will be used as the "scope"
     48    // object for this particular module.
     49    const pseudoSandbox = SpecialPowers.Cu.createObjectIn(sharedGlobalSandbox, {
     50      defineAs: "tempGlobalScope",
     51    });
     52    Object.assign(pseudoSandbox, properties);
     53 
     54    const request = new XMLHttpRequest();
     55    request.open("GET", url, false); // `false` makes the request synchronous
     56    request.send(null);
     57    const code = request.responseText;
     58 
     59    SpecialPowers.Cu.evalInSandbox(
     60      `with (tempGlobalScope) { ${code} }`,
     61      sharedGlobalSandbox
     62    );
     63 
     64    return module.exported_symbols;
     65  };
     66 
     67  const returnObj = {
     68    require: {
     69      enumerable: true,
     70      value: require,
     71    },
     72  };
     73 
     74  return Object.create(null, returnObj);
     75 }