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'use strict';
// function/object that prefixed with F (which means the binding is frozen after the return)
const FArray = Array
const FArrayIsArray = Array.isArray
const FProxy = Proxy
const FProxyRevocable = Proxy.revocable
const FError = Error
const FCall = Function.prototype.call
const FMap = Map
const FMapHas = Map.prototype.has
const FMapSet = Map.prototype.set
const FMapGet = Map.prototype.get
const FWeakMap = WeakMap
const FWeakMapHas = WeakMap.prototype.has
const FWeakMapSet = WeakMap.prototype.set
const FWeakMapGet = WeakMap.prototype.get
const FBWeakMapHas: (self: WeakMap<any, any>, ...args: any[]) => any = FCall.bind(FWeakMapHas)
const FBWeakMapSet: (self: WeakMap<any, any>, ...args: any[]) => any = FCall.bind(FWeakMapSet)
const FBWeakMapGet: (self: WeakMap<any, any>, ...args: any[]) => any = FCall.bind(FWeakMapGet)
const FBMapHas: (self: Map<any, any>, ...args: any[]) => any = FCall.bind(FMapHas)
const FBMapSet: (self: Map<any, any>, ...args: any[]) => any = FCall.bind(FMapSet)
const FBMapGet: (self: Map<any, any>, ...args: any[]) => any = FCall.bind(FMapGet)
const FSet = Set
const FSetHas = Set.prototype.has
const FSetAdd = Set.prototype.add
const FSetDelete = Set.prototype.delete
const FWeakSet = WeakSet
const FWeakSetHas = WeakSet.prototype.has
const FWeakSetAdd = WeakSet.prototype.add
const FWeakSetDelete = WeakSet.prototype.delete
const FBSetHas: (self: Set<any>, ...args: any[]) => any = FCall.bind(FSetHas)
const FBSetAdd: (self: Set<any>, ...args: any[]) => any = FCall.bind(FSetAdd)
const FBSetDelete: (self: Set<any>, ...args: any[]) => any = FCall.bind(FSetDelete)
const FBWeakSetHas: (self: WeakSet<any>, ...args: any[]) => any = FCall.bind(FWeakSetHas)
const FBWeakSetAdd: (self: WeakSet<any>, ...args: any[]) => any = FCall.bind(FWeakSetAdd)
const FBWeakSetDelete: (self: WeakSet<any>, ...args: any[]) => any = FCall.bind(FWeakSetDelete)
const FArrayMap = Array.prototype.map
const FBArrayMap: <T, U>(arg: T[], cb: (v: T, i: number) => U)=>U[] = FCall.bind(FArrayMap) as any
const FReflect: typeof Reflect = {
// ...Reflect,
construct: Reflect.construct,
ownKeys: Reflect.ownKeys,
get: Reflect.get,
set: Reflect.set,
getOwnPropertyDescriptor: Reflect.getOwnPropertyDescriptor,
apply: Reflect.apply,
getPrototypeOf: Reflect.getPrototypeOf,
defineProperty: Reflect.defineProperty,
setPrototypeOf: Reflect.setPrototypeOf,
isExtensible: Reflect.isExtensible,
preventExtensions: Reflect.preventExtensions,
has: Reflect.has,
deleteProperty: Reflect.deleteProperty,
enumerate: Reflect.enumerate
}
const FCreateEmpty = Object.create.bind(Object, null)
const FSetPrototypeOf = Object.setPrototypeOf
const FGetPrototypeOf = Object.getPrototypeOf
const FGetOwnPropertyDescriptor = Object.getOwnPropertyDescriptor
const FFreeze = Object.freeze
const FIsFrozen = Object.isFrozen
const SymbolIterator: (typeof Symbol)['iterator'] = Symbol.iterator
const FBArrayToIterator: <T>(arr: T[])=> Iterable<T> = (arr: any[]) => {
let index = 0
const next = () => {
if (index >= arr.length) {
return {
value: undefined,
done: true
}
} else {
const result = {
value: arr[index],
done: false
}
index++
return result
}
}
const value: {
next: typeof next,
[Symbol.iterator]: any
} = {
next,
[SymbolIterator]: function () { return this }
} as any
return value
}
const FSetValues = Set.prototype.values
const FSetIteratorNext = (FReflect.getPrototypeOf((new Set).values()) as any).next
const FBSetToIterator = (set: Set<any>) => {
const iterator = FReflect.apply(FSetValues, set, [])
const next = () => FReflect.apply(FSetIteratorNext, iterator, [])
const value: {
next: typeof next,
[Symbol.iterator]: any
} = {
next,
[SymbolIterator]: function () { return this }
} as any
return value
}
const FConsoleError = console.error
/**
* Using the getOwnPropertyDescriptor and FGetPrototypeOf
* @param obj any
* @param key object key
*/
const FResolveDesc = (obj: any, key: string | number | symbol) => {
const weak = new FWeakMap()
let currentTarget = obj
while (currentTarget && !FBWeakMapHas(weak, currentTarget)) {
FBWeakMapSet(weak, currentTarget, true)
const desc = FReflect.getOwnPropertyDescriptor(currentTarget, key)
if (desc !== undefined) {
FSetPrototypeOf(desc, null)
return desc
}
currentTarget = FGetPrototypeOf(currentTarget)
}
return undefined
}
/**
* Clear all prototype prop from the whole object
*/
const dropPrototypeRecursive = <T extends object>(unsafeObj: T, record = FReflect.construct(FWeakMap, [])) => {
if (FBWeakMapHas(record, unsafeObj)) {
return unsafeObj
}
if (unsafeObj != null && (typeof unsafeObj === 'function' || typeof unsafeObj === 'object')) {
FSetPrototypeOf(unsafeObj, null)
Iif (FGetPrototypeOf(unsafeObj) !== null) {
throw new FError('PROTOTYPE LEAKING!!!')
}
FFreeze(unsafeObj)
Iif (!FIsFrozen) {
throw new FError('tainted object!!!')
}
// the object may use timing attack to bypass get prototype check
// because it is not frozen at that time
Iif (FGetPrototypeOf(unsafeObj) !== null) {
throw new FError('PROTOTYPE LEAKING!!!')
}
FBWeakMapSet(record, unsafeObj, true)
// burst it no matter it is enumerable or not
// nothing should ever leak
var keys = FReflect.ownKeys(/** @type {any} */(unsafeObj))
for (let i = 0; i < keys.length; i++) {
dropPrototypeRecursive((unsafeObj as any)[keys[i]], record)
}
}
return unsafeObj
}
/**
* get prop without trigger the getter
* @param unsafeObj
* @param name
*/
const safeGetProp = <T extends object, U extends keyof T>(unsafeObj: T, name: U): T[U] | null => {
Iif (unsafeObj == null || (typeof unsafeObj !== 'object' && typeof unsafeObj !== 'function')) {
return null
}
try {
const unsafeDesc = FGetOwnPropertyDescriptor(unsafeObj, name)
const valueDesc = FGetOwnPropertyDescriptor(unsafeDesc, 'value')
Iif (valueDesc == null) {
throw "value desk does not exist"
}
return 'value' in valueDesc ? valueDesc.value : null
} catch (err) {
FConsoleError('BAD ACTOR', unsafeObj, name)
throw 'This shouldn\'t happen'
}
}
const FNodeNodeNameGetter = typeof Node != 'undefined'
? FReflect.getOwnPropertyDescriptor(Node.prototype, 'nodeName')!.get!
: () => {}
// Test whether given object is a dom node or not
const getNodeName = (obj: any) => {
try {
return FReflect.apply(FNodeNodeNameGetter, obj, [])
} catch (err) {
return null
}
}
// prevent arguments.caller
dropPrototypeRecursive(safeGetProp)
/**
* expose `this` to getter/setter on these prototypes should be safe,
* because they only use internal slot of 'this'
* input/output still need to be wrapped
*/
const whitelistedPrototypes: any[] = [
Date.prototype,
Promise.prototype,
Map.prototype,
Set.prototype,
WeakMap.prototype,
WeakSet.prototype,
ArrayBuffer.prototype,
(Reflect.getPrototypeOf(Int8Array) as any).prototype, // TypedArray
Int8Array.prototype,
Int16Array.prototype,
Int32Array.prototype,
Uint8Array.prototype,
Uint8ClampedArray.prototype,
Uint16Array.prototype,
Uint32Array.prototype,
DataView.prototype,
RegExp.prototype,
FReflect.getPrototypeOf(FReflect.getPrototypeOf((function * () {})())), // generator prototype
FReflect.getPrototypeOf(new Map().values()), // map iterator
FReflect.getPrototypeOf(new Set().values()), // set iterator
]
Eif (typeof SharedArrayBuffer !== 'undefined') {
whitelistedPrototypes[whitelistedPrototypes.length] = SharedArrayBuffer.prototype
}
const shared = {
FProxy,
FProxyRevocable,
FError,
FArray,
FArrayIsArray,
FMap,
FBMapHas,
FBMapGet,
FBMapSet,
FWeakMap,
FBWeakMapHas,
FBWeakMapSet,
FBWeakMapGet,
FSet,
FBSetHas,
FBSetAdd,
FBSetDelete,
FWeakSet,
FBWeakSetHas,
FBWeakSetAdd,
FBWeakSetDelete,
FBArrayMap,
FBArrayToIterator,
FBSetToIterator,
FReflect,
FCreateEmpty,
FFreeze,
FIsFrozen,
FResolveDesc,
FConsoleError,
dropPrototypeRecursive,
safeGetProp,
getNodeName,
whitelistedPrototypes
}
FSetPrototypeOf(shared, null)
FFreeze(shared)
return shared
}
export type IShared = ReturnType<typeof makeShared>
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