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// Copyright (C) 2018 Agoric
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// SPDX-License-Identifier: Apache-2.0
// Based upon:
// https://github.com/google/caja/blob/HEAD/src/com/google/caja/ses/startSES.js
// https://github.com/google/caja/blob/HEAD/src/com/google/caja/ses/repairES5.js
// https://github.com/tc39/proposal-ses/blob/e5271cc42a257a05dcae2fd94713ed2f46c08620/shim/src/freeze.js
'use strict';
const {
AggregateError,
AggregateErrorPrototype,
Array,
ArrayBuffer,
ArrayBufferPrototype,
ArrayIteratorPrototype,
ArrayPrototype,
ArrayPrototypeForEach,
ArrayPrototypePush,
BigInt,
BigInt64Array,
BigInt64ArrayPrototype,
BigIntPrototype,
BigUint64Array,
BigUint64ArrayPrototype,
Boolean,
BooleanPrototype,
DataView,
DataViewPrototype,
Date,
DatePrototype,
Error,
ErrorPrototype,
EvalError,
EvalErrorPrototype,
FinalizationRegistry,
FinalizationRegistryPrototype,
Float32Array,
Float32ArrayPrototype,
Float64Array,
Float64ArrayPrototype,
Function,
FunctionPrototype,
Int16Array,
Int16ArrayPrototype,
Int32Array,
Int32ArrayPrototype,
Int8Array,
Int8ArrayPrototype,
Map,
MapPrototype,
Number,
NumberPrototype,
Object,
ObjectDefineProperty,
ObjectFreeze,
ObjectGetOwnPropertyDescriptor,
ObjectGetOwnPropertyDescriptors,
ObjectGetOwnPropertyNames,
ObjectGetOwnPropertySymbols,
ObjectGetPrototypeOf,
ObjectPrototype,
ObjectPrototypeHasOwnProperty,
Promise,
PromisePrototype,
Proxy,
RangeError,
RangeErrorPrototype,
ReferenceError,
ReferenceErrorPrototype,
ReflectOwnKeys,
RegExp,
RegExpPrototype,
SafeSet,
Set,
SetPrototype,
String,
StringIteratorPrototype,
StringPrototype,
Symbol,
SymbolIterator,
SymbolMatchAll,
SymbolPrototype,
SyntaxError,
SyntaxErrorPrototype,
TypeError,
TypeErrorPrototype,
TypedArray,
TypedArrayPrototype,
Uint16Array,
Uint16ArrayPrototype,
Uint32Array,
Uint32ArrayPrototype,
Uint8Array,
Uint8ArrayPrototype,
Uint8ClampedArray,
Uint8ClampedArrayPrototype,
URIError,
URIErrorPrototype,
WeakMap,
WeakMapPrototype,
WeakRef,
WeakRefPrototype,
WeakSet,
WeakSetPrototype,
decodeURI,
decodeURIComponent,
encodeURI,
encodeURIComponent,
escape,
globalThis,
unescape,
} = primordials;
const {
Atomics,
Intl,
SharedArrayBuffer,
WebAssembly
} = globalThis;
module.exports = function() {
const { Console } = require('internal/console/constructor');
const { console } = require('internal/console/global');
const {
clearImmediate,
clearInterval,
clearTimeout,
setImmediate,
setInterval,
setTimeout
} = require('timers');
const intrinsicPrototypes = [
// 20 Fundamental Objects
ObjectPrototype, // 20.1
FunctionPrototype, // 20.2
BooleanPrototype, // 20.3
SymbolPrototype, // 20.4
ErrorPrototype, // 20.5
AggregateErrorPrototype,
EvalErrorPrototype,
RangeErrorPrototype,
ReferenceErrorPrototype,
SyntaxErrorPrototype,
TypeErrorPrototype,
URIErrorPrototype,
// 21 Numbers and Dates
NumberPrototype, // 21.1
BigIntPrototype, // 21.2
DatePrototype, // 21.4
// 22 Text Processing
StringPrototype, // 22.1
StringIteratorPrototype, // 22.1.5
RegExpPrototype, // 22.2
// 22.2.7 RegExpStringIteratorPrototype
ObjectGetPrototypeOf(/e/[SymbolMatchAll]()),
// 23 Indexed Collections
ArrayPrototype, // 23.1
ArrayIteratorPrototype, // 23.1.5
TypedArrayPrototype, // 23.2
Int8ArrayPrototype,
Uint8ArrayPrototype,
Uint8ClampedArrayPrototype,
Int16ArrayPrototype,
Uint16ArrayPrototype,
Int32ArrayPrototype,
Uint32ArrayPrototype,
Float32ArrayPrototype,
Float64ArrayPrototype,
BigInt64ArrayPrototype,
BigUint64ArrayPrototype,
// 24 Keyed Collections
MapPrototype, // 24.1
// 24.1.5 MapIteratorPrototype
ObjectGetPrototypeOf(new Map()[SymbolIterator]()),
SetPrototype, // 24.2
// 24.2.5 SetIteratorPrototype
ObjectGetPrototypeOf(new Set()[SymbolIterator]()),
WeakMapPrototype, // 24.3
WeakSetPrototype, // 24.4
// 25 Structured Data
ArrayBufferPrototype, // 25.1
SharedArrayBuffer.prototype, // 25.2
DataViewPrototype, // 25.3
// 26 Managing Memory
WeakRefPrototype, // 26.1
FinalizationRegistryPrototype, // 26.2
// 27 Control Abstraction Objects
// 27.1 Iteration
ObjectGetPrototypeOf(ArrayIteratorPrototype), // 27.1.2 IteratorPrototype
// 27.1.3 AsyncIteratorPrototype
ObjectGetPrototypeOf(ObjectGetPrototypeOf(ObjectGetPrototypeOf(
(async function*() {})()
))),
PromisePrototype, // 27.2
// Other APIs / Web Compatibility
Console.prototype,
WebAssembly.Module.prototype,
WebAssembly.Instance.prototype,
WebAssembly.Table.prototype,
WebAssembly.Memory.prototype,
WebAssembly.CompileError.prototype,
WebAssembly.LinkError.prototype,
WebAssembly.RuntimeError.prototype,
];
const intrinsics = [
// 10.2.4.1 ThrowTypeError
ObjectGetOwnPropertyDescriptor(FunctionPrototype, 'caller').get,
// 19 The Global Object
// 19.2 Function Properties of the Global Object
// eslint-disable-next-line node-core/prefer-primordials
eval,
// eslint-disable-next-line node-core/prefer-primordials
isFinite,
// eslint-disable-next-line node-core/prefer-primordials
isNaN,
// eslint-disable-next-line node-core/prefer-primordials
parseFloat,
// eslint-disable-next-line node-core/prefer-primordials
parseInt,
// 19.2.6 URI Handling Functions
decodeURI,
decodeURIComponent,
encodeURI,
encodeURIComponent,
// 20 Fundamental Objects
Object, // 20.1
Function, // 20.2
Boolean, // 20.3
Symbol, // 20.4
Error, // 20.5
AggregateError,
EvalError,
RangeError,
ReferenceError,
SyntaxError,
TypeError,
URIError,
// 21 Numbers and Dates
Number, // 21.1
BigInt, // 21.2
// eslint-disable-next-line node-core/prefer-primordials
Math, // 21.3
Date, // 21.4
// 22 Text Processing
String, // 22.1
StringIteratorPrototype, // 22.1.5
RegExp, // 22.2
// 22.2.7 RegExpStringIteratorPrototype
ObjectGetPrototypeOf(/e/[SymbolMatchAll]()),
// 23 Indexed Collections
Array, // 23.1
ArrayIteratorPrototype, // 23.1.5
// 23.2 TypedArray
TypedArray,
Int8Array,
Uint8Array,
Uint8ClampedArray,
Int16Array,
Uint16Array,
Int32Array,
Uint32Array,
Float32Array,
Float64Array,
BigInt64Array,
BigUint64Array,
// 24 Keyed Collections
Map, // 24.1
// 24.1.5 MapIteratorPrototype
ObjectGetPrototypeOf(new Map()[SymbolIterator]()),
Set, // 24.2
// 24.2.5 SetIteratorPrototype
ObjectGetPrototypeOf(new Set()[SymbolIterator]()),
WeakMap, // 24.3
WeakSet, // 24.4
// 25 Structured Data
ArrayBuffer, // 25.1
SharedArrayBuffer, // 25.2
DataView, // 25.3
Atomics, // 25.4
// eslint-disable-next-line node-core/prefer-primordials
JSON, // 25.5
// 26 Managing Memory
WeakRef, // 26.1
FinalizationRegistry, // 26.2
// 27 Control Abstraction Objects
// 27.1 Iteration
ObjectGetPrototypeOf(ArrayIteratorPrototype), // 27.1.2 IteratorPrototype
// 27.1.3 AsyncIteratorPrototype
ObjectGetPrototypeOf(ObjectGetPrototypeOf(ObjectGetPrototypeOf(
(async function*() {})()
))),
Promise, // 27.2
// 27.3 GeneratorFunction
ObjectGetPrototypeOf(function* () {}),
// 27.4 AsyncGeneratorFunction
ObjectGetPrototypeOf(async function* () {}),
// 27.7 AsyncFunction
ObjectGetPrototypeOf(async function() {}),
// 28 Reflection
// eslint-disable-next-line node-core/prefer-primordials
Reflect, // 28.1
Proxy, // 28.2
// B.2.1
escape,
unescape,
// Other APIs / Web Compatibility
clearImmediate,
clearInterval,
clearTimeout,
setImmediate,
setInterval,
setTimeout,
console,
WebAssembly,
];
if (typeof Intl !== 'undefined') {
ArrayPrototypePush(intrinsicPrototypes,
Intl.Collator.prototype,
Intl.DateTimeFormat.prototype,
Intl.ListFormat.prototype,
Intl.NumberFormat.prototype,
Intl.PluralRules.prototype,
Intl.RelativeTimeFormat.prototype,
);
ArrayPrototypePush(intrinsics, Intl);
}
ArrayPrototypeForEach(intrinsicPrototypes, enableDerivedOverrides);
const frozenSet = new WeakSet();
ArrayPrototypeForEach(intrinsics, deepFreeze);
// 19.1 Value Properties of the Global Object
ObjectDefineProperty(globalThis, 'globalThis', {
__proto__: null,
configurable: false,
writable: false,
value: globalThis,
});
// Objects that are deeply frozen.
function deepFreeze(root) {
/**
* "innerDeepFreeze()" acts like "Object.freeze()", except that:
*
* To deepFreeze an object is to freeze it and all objects transitively
* reachable from it via transitive reflective property and prototype
* traversal.
*/
function innerDeepFreeze(node) {
// Objects that we have frozen in this round.
const freezingSet = new SafeSet();
// If val is something we should be freezing but aren't yet,
// add it to freezingSet.
function enqueue(val) {
if (Object(val) !== val) {
// ignore primitives
return;
}
const type = typeof val;
if (type !== 'object' && type !== 'function') {
// NB: handle for any new cases in future
}
if (frozenSet.has(val) || freezingSet.has(val)) {
// TODO: Use uncurried form
// Ignore if already frozen or freezing
return;
}
freezingSet.add(val); // TODO: Use uncurried form
}
function doFreeze(obj) {
// Immediately freeze the object to ensure reactive
// objects such as proxies won't add properties
// during traversal, before they get frozen.
// Object are verified before being enqueued,
// therefore this is a valid candidate.
// Throws if this fails (strict mode).
ObjectFreeze(obj);
// We rely upon certain commitments of Object.freeze and proxies here
// Get stable/immutable outbound links before a Proxy has a chance to do
// something sneaky.
const proto = ObjectGetPrototypeOf(obj);
const descs = ObjectGetOwnPropertyDescriptors(obj);
enqueue(proto);
ArrayPrototypeForEach(ReflectOwnKeys(descs), (name) => {
const desc = descs[name];
if (ObjectPrototypeHasOwnProperty(desc, 'value')) {
// todo uncurried form
enqueue(desc.value);
} else {
enqueue(desc.get);
enqueue(desc.set);
}
});
}
function dequeue() {
// New values added before forEach() has finished will be visited.
freezingSet.forEach(doFreeze); // TODO: Curried forEach
}
function commit() {
// TODO: Curried forEach
// We capture the real WeakSet.prototype.add above, in case someone
// changes it. The two-argument form of forEach passes the second
// argument as the 'this' binding, so we add to the correct set.
freezingSet.forEach(frozenSet.add, frozenSet);
}
enqueue(node);
dequeue();
commit();
}
innerDeepFreeze(root);
return root;
}
/**
* For a special set of properties (defined below), it ensures that the
* effect of freezing does not suppress the ability to override these
* properties on derived objects by simple assignment.
*
* Because of lack of sufficient foresight at the time, ES5 unfortunately
* specified that a simple assignment to a non-existent property must fail if
* it would override a non-writable data property of the same name. (In
* retrospect, this was a mistake, but it is now too late and we must live
* with the consequences.) As a result, simply freezing an object to make it
* tamper proof has the unfortunate side effect of breaking previously correct
* code that is considered to have followed JS best practices, if this
* previous code used assignment to override.
*
* To work around this mistake, deepFreeze(), prior to freezing, replaces
* selected configurable own data properties with accessor properties which
* simulate what we should have specified -- that assignments to derived
* objects succeed if otherwise possible.
*/
function enableDerivedOverride(obj, prop, desc) {
if (ObjectPrototypeHasOwnProperty(desc, 'value') && desc.configurable) {
const value = desc.value;
function getter() {
return value;
}
// Re-attach the data property on the object so
// it can be found by the deep-freeze traversal process.
getter.value = value;
function setter(newValue) {
if (obj === this) {
// eslint-disable-next-line no-restricted-syntax
throw new TypeError(
`Cannot assign to read only property '${prop}' of object '${obj}'`
);
}
if (ObjectPrototypeHasOwnProperty(this, prop)) {
this[prop] = newValue;
} else {
ObjectDefineProperty(this, prop, {
__proto__: null,
value: newValue,
writable: true,
enumerable: true,
configurable: true
});
}
}
ObjectDefineProperty(obj, prop, {
__proto__: null,
get: getter,
set: setter,
enumerable: desc.enumerable,
configurable: desc.configurable
});
}
}
function enableDerivedOverrides(obj) {
if (!obj) {
return;
}
const descs = ObjectGetOwnPropertyDescriptors(obj);
if (!descs) {
return;
}
ArrayPrototypeForEach(ObjectGetOwnPropertyNames(obj), (prop) => {
return enableDerivedOverride(obj, prop, descs[prop]);
});
ArrayPrototypeForEach(ObjectGetOwnPropertySymbols(obj), (prop) => {
return enableDerivedOverride(obj, prop, descs[prop]);
});
}
};
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