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/**
* Any copyright is dedicated to the Public Domain.
*/
// This file expectes the SpecialPowers to be available in the scope
// it is loaded into.
/* global SpecialPowers */
export function ModuleLoader(base, depth, proto) {
const modules = {};
const principal = SpecialPowers.wrap(document).nodePrincipal;
const sharedGlobalSandbox = SpecialPowers.Cu.Sandbox(principal, {
invisibleToDebugger: true,
sandboxName: "FS Module Loader",
sandboxPrototype: proto,
wantComponents: false,
wantGlobalProperties: [],
wantXrays: false,
});
const require = async function (id) {
if (modules[id]) {
return modules[id].exported_symbols;
}
const url = new URL(depth + id, base);
const module = Object.create(null, {
exported_symbols: {
configurable: false,
enumerable: true,
value: Object.create(null),
writable: true,
},
});
modules[id] = module;
const properties = {
require_module: require,
exported_symbols: module.exported_symbols,
};
// Create a new object in this sandbox, that will be used as the "scope"
// object for this particular module.
const pseudoSandbox = SpecialPowers.Cu.createObjectIn(sharedGlobalSandbox, {
defineAs: "tempGlobalScope",
});
Object.assign(pseudoSandbox, properties);
const request = new XMLHttpRequest();
request.open("GET", url, false); // `false` makes the request synchronous
request.send(null);
const code = request.responseText;
SpecialPowers.Cu.evalInSandbox(
`with (tempGlobalScope) { ${code} }`,
sharedGlobalSandbox
);
return module.exported_symbols;
};
const returnObj = {
require: {
enumerable: true,
value: require,
},
};
return Object.create(null, returnObj);
}