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metamask-extension/test/helpers/protect-intrinsics-helpers.js

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const { strict: assert } = require('assert');
module.exports = {
getGlobalProperties,
testIntrinsic,
};
/**
* Gets the global intrinsic property names in a locked down environemnt.
*
* @returns {Set<string>} All global intrinsic property names.
*/
function getGlobalProperties() {
// These are Agoric inventions, and we don't care about them.
const ignoreList = new Set([
'Compartment',
'HandledPromise',
'StaticModuleRecord',
]);
const namedIntrinsics = Reflect.ownKeys(new Compartment().globalThis);
return new Set(
[
// Added to global scope by ses/dist/lockdown.cjs.
...namedIntrinsics,
// TODO: Also include the named platform globals
// This grabs every enumerable property on globalThis.
// ...Object.keys(globalThis),
].filter((propertyName) => !ignoreList.has(propertyName)),
);
}
/**
* Performs a number of assertions on the specified intrinsic property to
* ensure that the environment is locked down properly.
* Throws if any assertion fails.
*
* @param {string} propertyName - The name of the intrinsic property to test.
*/
function testIntrinsic(propertyName) {
const descriptor = Reflect.getOwnPropertyDescriptor(globalThis, propertyName);
assert.ok(
descriptor,
`globalThis["${propertyName}"] should have a descriptor`,
);
// As long as Object.isFrozen is the true Object.isFrozen, the object
// it is called with cannot lie about being frozen.
const value = globalThis[propertyName];
if (value !== globalThis) {
assert.equal(
Object.isFrozen(value),
true,
`value of universal property globalThis["${propertyName}"] should be frozen`,
);
}
// The writability of properties with accessors cannot be modified.
if ('set' in descriptor || 'get' in descriptor) {
assert.equal(
descriptor.configurable,
false,
`globalThis["${propertyName}"] should be non-configurable`,
);
} else {
assert.equal(
descriptor.configurable,
false,
`globalThis["${propertyName}"] should be non-configurable`,
);
assert.equal(
descriptor.writable,
false,
`globalThis["${propertyName}"] should be non-writable`,
);
}
}