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makeShared
} from './sharedFactory'
import {
API,
Token,
Response,
ValueWrapperRecord,
ValueWrapperWellKnown,
ValueWrapper,
ResponseFailed,
World,
} from './interface.js'
import {
createProxyFactoryFactory
} from './proxyFactoryBuilder'
const SES = {
makeShared,
createProxyFactoryFactory,
init,
createScript,
fastInit,
fastInitNode,
DEV: false
}
// this need to be run before any other script to get properly untainted global
export function init(configureCallback ?: API.ConfigureCallback) {
'use strict';
const createProxyFactory = SES.createProxyFactoryFactory(SES)
// Must not use any global object
// And using only the frozen object returns from makeShared
const shared = SES.makeShared()
// lock down options after this point
shared.dropPrototypeRecursive(SES as any)
const FArrayIsArray = shared.FArrayIsArray
const FError = shared.FError
const FMap = shared.FMap
const FBMapSet = shared.FBMapSet
const FBMapGet = shared.FBMapGet
const FBMapHas = shared.FBMapHas
const FWeakMap = shared.FWeakMap
const FBWeakMapHas = shared.FBWeakMapHas
const FBWeakMapSet = shared.FBWeakMapSet
const FBWeakMapGet = shared.FBWeakMapGet
const FReflect = shared.FReflect
const FCreateEmpty = shared.FCreateEmpty
const FBArrayMap = shared.FBArrayMap
const FBArrayToIterator = shared.FBArrayToIterator
const dropPrototypeRecursive = shared.dropPrototypeRecursive
const safeGetProp = shared.safeGetProp
return function createServer<T>(root: T, options: { fixInternalSlot: boolean} = { fixInternalSlot: false}) {
const successVal = <T>(v: T) => ({
success: true as const,
value: v
})
const failVal = <T>(v: T) => ({
success: false as const,
value: v
})
// real object in this world to token
const realToToken = new FWeakMap<object, Token>()
// token to real object in this world
const tokenToReal = new FWeakMap<Token, object>()
// token from external world to proxy in this world
const tokenToProxy = new FWeakMap<Token, object>()
// proxy in this world to token from external
const proxyToToken = new FWeakMap<object, Token>()
// token from external world to proxy in this world
const tokenToRedirected = new FWeakMap<Token, object>()
// proxy in this world to token from external
const redirectedToToken = new FWeakMap<object, Token>()
// not freezing these until configure complete
const metaAttachCallBacks: API.IMetaAttach<any>[] = []
const proxyInitCallbacks: API.ICustomProxyInit[] = []
const customTraps: Record<string, API.ICustomTrap> = {}
const unwrapCallBacks: API.UnwrapCallBack[] = []
const trapHooks: API.TrapHooks[] = []
const wellKnownValues = new FMap<string | symbol, any>()
const wellKnownValuesReversed = new FMap<any, string | symbol>()
FReflect.setPrototypeOf(customTraps, null)
const registerMetaCallback: API.RegisterMetaCallback = (cb) => {
metaAttachCallBacks[metaAttachCallBacks.length] = cb
}
const registerCustomProxyInit: API.RegisterCustomProxyInit = (cb) => {
proxyInitCallbacks[proxyInitCallbacks.length] = cb
}
const registerCustomTrap: API.RegisterCustomTrap = (str, cb) => {
if (FReflect.getOwnPropertyDescriptor(customTraps, str)) {
throw new FError(`trap ${str} already exists`)
}
customTraps[str] = (...args) => {
try {
// enforce safety policy
const result = cb(...args)
dropPrototypeRecursive(result)
return result
} catch (err) {
// this shouldn't happen
if (SES.DEV) debugger
return badPayload
}
}
}
const registerUnwrapCallback: API.RegisterUnwrapCallback = (cb) => {
unwrapCallBacks[unwrapCallBacks.length] = cb
}
const registerTrapHooks: API.RegisterTrapHooks = (cb) => {
trapHooks[trapHooks.length] = cb
}
const registerWellKnownValue: API.RegisterWellKnownValue = (key, value) => {
FBMapSet(wellKnownValues, key, value)
FBMapSet(wellKnownValuesReversed, value, key)
}
/**
* get a safe token that represent this object
* @param obj
*/
function toToken<T extends object>(obj: T, world: World, type: 'function' | 'object'): Token {
Iif (redirectedToToken.has(obj)) {
return redirectedToToken.get(obj)!
}
if (proxyToToken.has(obj)) {
return proxyToToken.get(obj)!
}
if (realToToken.has(obj)) {
return realToToken.get(obj)!
}
var token: Token = FCreateEmpty({})
token.owner = world
token.type = type
// wtf?
// https://tc39.es/ecma262/#sec-isarray
// https://tc39.es/ecma262/#sec-proxy-revocation-functions
try {
token.isArray = FArrayIsArray(obj)
token.isRevoked = false
} catch (err) {
token.isArray = false
token.isRevoked = true
}
let meta = {}
// hooks: attach metadata
if (metaAttachCallBacks.length > 0) {
for (let i = 0; i < metaAttachCallBacks.length; i++) {
let res
try {
res = metaAttachCallBacks[i](obj)
} catch (err) {
// mock the error
debugger
throw 'Token creation error'
}
meta = { ...meta, ...res }
}
}
// hooks end: attach metadata
token.meta = meta
token.functionHasNoPrototype = false
if (type === 'function') {
const desc = FReflect.getOwnPropertyDescriptor(obj, 'prototype')
Eif (desc == null) {
token.functionHasNoPrototype = true
} else if (desc.configurable) {
token.functionHasNoPrototype = true
}
}
token.REALLY_DANGEROUS_INVOKE_WITH_RAW_THIS = (self, ...argsWrapped) => {
try {
for (let i = 0; i < trapHooks.length; i++) {
var hook = trapHooks[i]
if (hook.dangerousApply) {
const res = hook.dangerousApply(self, obj, argsWrapped)
if (res != null) {
return res
}
}
}
} catch (err) {
return failVal(toWrapper(err, currentWorld))
}
try {
const argsRes = FBArrayMap(argsWrapped, i => unwrap(i))
for (let i of FBArrayToIterator(argsRes)) {
if (!i.success) {
throw new Error('bad input')
}
}
const args = FBArrayMap(argsRes, i => i.value)
const res = FReflect.apply(self, obj, args)
return successVal(toWrapper(res, currentWorld))
} catch (err) {
return failVal(toWrapper(err, currentWorld))
}
}
dropPrototypeRecursive(token.REALLY_DANGEROUS_INVOKE_WITH_RAW_THIS)
FBWeakMapSet(realToToken, obj, token)
FBWeakMapSet(tokenToReal, token, obj)
return token
}
function unwrapToken(token: Token): Response<any, any> {
if (FBWeakMapHas(tokenToReal, token)) {
const real = FBWeakMapGet(tokenToReal, token)
for (let i = 0; i < unwrapCallBacks.length; i++) {
try {
unwrapCallBacks[i](real)
} catch (err) {
// return it is allowed because user do allowed to do it
return {
success: false,
value: err
}
}
}
return {
success: true,
value: real
}
}
Iif (FBWeakMapHas(tokenToRedirected, token)) {
return {
success: true,
value: FBWeakMapGet(tokenToRedirected, token)
}
}
if (FBWeakMapHas(tokenToProxy, token)) {
return {
success: true,
value: FBWeakMapGet(tokenToProxy, token)
}
}
// to fake
const type: string | null = FReflect.get(token, 'type')
const world: World = FReflect.get(token, 'owner')
Iif (world === currentWorld) {
return {
success: true,
value: new FError('Unexpected owner of current world')
}
}
switch (type) {
case 'function':
return {
success: true,
value: createProxy(token)
}
case 'object':
return {
success: true,
value: createProxy(token)
}
default:
return {
success: true,
value: new FError('bad type')
}
}
}
function toWrapper(obj: any, world: World): ValueWrapper {
// skip all following process if the value is `well known`
Iif (FBMapHas(wellKnownValuesReversed, obj)) {
return {
type: 'well-known',
value: FBMapGet(wellKnownValuesReversed, obj)
}
}
if (obj === null) {
return {
type: 'primitive',
value: obj
}
}
switch (typeof obj) {
case 'bigint':
case 'boolean':
case 'number':
case 'string':
case 'symbol':
return {
type: 'primitive',
value: obj
}
case 'undefined':
return {
type: 'primitive',
value: undefined // thanks to document.all
}
case 'function':
return {
type: 'function',
value: toToken(obj, world, 'function')
}
case 'object':
return {
type: 'object',
value: toToken(obj, world, 'object')
}
default:
throw new FError('how is this possible?')
}
}
function toRecord(obj: any, world: World): ValueWrapper {
const keys = FReflect.ownKeys(obj)
const target: ValueWrapperRecord = FCreateEmpty({}) as any
target.type = 'record'
target.value = FCreateEmpty({})
for (let key of FBArrayToIterator(keys)) {
// symbol bug
target.value[key as any] = toWrapper(obj[key], world)
}
return target
}
function unwrap(unsafeObj: ValueWrapper): Response<any, any> {
switch (safeGetProp(unsafeObj, 'type')) {
case 'primitive':
const value = safeGetProp(unsafeObj, 'value')
Iif (value != null && (typeof value === 'function' || typeof value === 'object')) {
return failVal(new FError('bad'))
}
return successVal(value)
case 'function':
case 'object': {
const result = unwrapToken(safeGetProp(unsafeObj, 'value') as any)
if (result.success) {
return successVal(result.value)
} else {
return failVal(result.value)
}
}
case 'record': {
const result = FCreateEmpty({})
const value = safeGetProp(unsafeObj, 'value') as { [key: string]: ValueWrapper }
for (let key of FBArrayToIterator(FReflect.ownKeys(value))) {
// symbol bug
const res = unwrap(value[key as any])
Eif (res.success) {
result[key] = res.value
} else {
return failVal(res.value)
}
}
return successVal(result)
}
case 'well-known': {
const value = safeGetProp(unsafeObj as ValueWrapperWellKnown, 'value')!
const result = FBMapGet(wellKnownValues, value)
for (let i = 0; i < unwrapCallBacks.length; i++) {
try {
unwrapCallBacks[i](result)
} catch (err) {
// return it is allowed because user do allowed to do it
return {
success: false,
value: err
}
}
}
return successVal(result)
}
default:
return failVal(new FError('bad wrapper'))
}
}
// this need to be initialized outside of service catch, so it can't throw yet another stack overflow
const badPayload: ResponseFailed<ValueWrapper> = dropPrototypeRecursive({
success: false,
value: {
type: 'primitive',
value: 'Internal Error'
}
})
type MapToWrapper<T> = {
[Key in keyof T]: ValueWrapper
}
type BeArray<T> = T extends any[] ? T : never
function createHandler<
T extends keyof typeof FReflect,
U extends (typeof FReflect)[T],
V extends BeArray<MapToWrapper<Parameters<U>>>,
>(key: T) {
return function (...args: V) {
try {
for (let i = 0; i < trapHooks.length; i++) {
if ((trapHooks[i] as any)[key]) {
const fn = (trapHooks[i] as any)[key]
const res = fn(...args)
Eif (res != null) {
return dropPrototypeRecursive(res)
}
}
}
const unwrappedRes: Response<any, any>[] = FBArrayMap(args, (i: ValueWrapper) => unwrap(i))
for (let item of FBArrayToIterator(unwrappedRes)) {
if (!item.success) {
return failPayload(item)
}
}
const unwrapped = FBArrayMap(unwrappedRes, (i: Response<any, any>) => i.value)
let value: any
let success: boolean
// start of zone that user mat throw error
try {
value = FReflect.apply(FReflect[key], null, unwrapped)
success = true
} catch (err) {
// return this is okay
success = false
value = err
}
// end of zone
return dropPrototypeRecursive({
success,
value: toWrapper(value, currentWorld)
})
} catch (err) {
// just don't touch any function because it may cause yet another stack overflow here
if (SES.DEV) debugger
return badPayload
}
}
}
const failPayload = <T>(arg: ResponseFailed<T>): ResponseFailed<ValueWrapper> => {
var wrapped = toWrapper(arg.value, currentWorld)
return {
success: false,
value: wrapped
}
}
// These shouldn't leak refs
const currentWorld: World = {
create(world: World) {
let res
try {
res = unwrap(world.getRoot().value)
} catch (err) {
// this shouldn't happen
if (SES.DEV) debugger
throw new Error('failed create')
}
Eif (res.success) {
return res.value
} else {
throw res.value
}
},
getRoot() {
try {
return dropPrototypeRecursive({
success: true,
value: toWrapper(root, currentWorld)
})
} catch (err) {
// this simply shouldn't happen, so we ate it
if (SES.DEV) debugger
return badPayload
}
},
getCustomTrap (name) {
return customTraps[name]
},
// TODO: redo with custom resolve
trap_get: createHandler('get'),
// TODO: redo with custom resolve
trap_set: createHandler('set'),
// trap_getOwnPropertyDescriptor: createHandler('getOwnPropertyDescriptor'),
trap_getOwnPropertyDescriptor(tokenW: ValueWrapper, keyW: ValueWrapper) {
try {
for (let i = 0; i < trapHooks.length; i++) {
const fn = trapHooks[i].getOwnPropertyDescriptor
Iif (fn) {
const res = fn(tokenW, keyW)
if (res != null) {
return dropPrototypeRecursive(res)
}
}
}
const tokenT = unwrap(tokenW)
const keyT = unwrap(keyW)
if (!tokenT.success) return failPayload(tokenT)
Iif (!keyT.success) return failPayload(keyT)
let value: any
let success: boolean
// start of zone that user mat throw error
try {
value = FReflect.getOwnPropertyDescriptor(tokenT.value, keyT.value)
success = true
} catch (err) {
// forward user error
success = false
value = err
}
return dropPrototypeRecursive({
success,
value: success && typeof value === 'object' ? toRecord(value, currentWorld) : toWrapper(value, currentWorld)
})
} catch (err) {
// just don't touch any function because it may cause yet another stack overflow here
if (SES.DEV) debugger
return badPayload
}
},
trap_ownKeys (tokenW: ValueWrapper) {
try {
for (let i = 0; i < trapHooks.length; i++) {
const fn = trapHooks[i].ownKeys
if (fn) {
const res = fn(tokenW)
if (res != null) {
return dropPrototypeRecursive(res)
}
}
}
const token = unwrap(tokenW)
if (!token.success) return failPayload(token)
let value: any
let success: boolean
// start of zone that user mat throw error
try {
value = FReflect.ownKeys(token.value)
success = true
} catch (err) {
// forward user error
success = false
value = err
}
return dropPrototypeRecursive({
success,
value: success ? toRecord(value, currentWorld) : toWrapper(value, currentWorld)
})
} catch (err) {
// just don't touch any function because it may cause yet another stack overflow here
if (SES.DEV) debugger
return badPayload
}
},
trap_apply: createHandler('apply'),
trap_construct: createHandler('construct'),
trap_getPrototypeOf: createHandler('getPrototypeOf'),
trap_defineProperty: createHandler('defineProperty'),
trap_setPrototypeOf: createHandler('setPrototypeOf'),
trap_isExtensible: createHandler('isExtensible'),
trap_preventExtensions: createHandler('preventExtensions'),
trap_has: createHandler('has'),
trap_deleteProperty: createHandler('deleteProperty')
}
dropPrototypeRecursive(currentWorld)
const createProxy = createProxyFactory(
shared,
unwrap,
toWrapper,
toRecord,
currentWorld,
proxyToToken,
tokenToProxy,
redirectedToToken,
tokenToRedirected,
proxyInitCallbacks
)
if (configureCallback != null) {
configureCallback({
registerMetaCallback,
registerCustomTrap,
registerCustomProxyInit,
registerUnwrapCallback,
registerTrapHooks,
registerWellKnownValue,
shared,
proxyToToken,
tokenToProxy,
tokenToRedirected,
redirectedToToken,
realToToken,
tokenToReal,
unwrap,
toWrapper,
toRecord,
world: currentWorld
})
}
function wrapMethodAndInvokeThisAsRaw (func: (...any: any[]) => any) {
var wrapped = new Proxy(func, {
apply (target, self, args) {
if (!FBWeakMapHas(proxyToToken, self) && !FBWeakMapHas(redirectedToToken, self)) {
return FReflect.apply(func, self, args)
} else {
let token!: Token
if (FBWeakMapHas(proxyToToken, self)) {
token = FBWeakMapGet(proxyToToken, self)
} else {
token = FBWeakMapGet(redirectedToToken, self)
}
const wrappedArgs = FBArrayMap(args, (i) => toWrapper(i, currentWorld))
try {
const res = token.REALLY_DANGEROUS_INVOKE_WITH_RAW_THIS(func, ...FBArrayToIterator(wrappedArgs))
if (res.success) {
let { success, value } = unwrap(res.value)
if (success) {
return value
} else {
throw value
}
} else {
let { success, value } = unwrap(res.value)
if (success) {
return value
} else {
throw value
}
}
} catch (err) {
let message = 'internal crash'
try {
message = err.message
} finally {
throw new Error(message)
}
}
}
}
})
return wrapped
}
Iif (options.fixInternalSlot) {
for (let obj of FBArrayToIterator(shared.whitelistedPrototypes)) {
for (let key of FBArrayToIterator(FReflect.ownKeys(obj))) {
if (key === 'constructor') {
continue // we should not patch the constructor for obvious reason
}
const desc = FReflect.getOwnPropertyDescriptor(obj, key)
if (!desc) continue
FReflect.setPrototypeOf(desc, null)
if (FReflect.getOwnPropertyDescriptor(desc, 'value')) {
// has value
if (typeof desc.value === 'function') {
FReflect.defineProperty(obj, key, {
...desc,
value: wrapMethodAndInvokeThisAsRaw(desc.value)
})
}
} else {
// has getter/setter
if (typeof desc.set === 'function') {
FReflect.defineProperty(obj, key, {
...desc,
set: wrapMethodAndInvokeThisAsRaw(desc.set)
})
}
if (typeof desc.get === 'function') {
FReflect.defineProperty(obj, key, {
...desc,
get: wrapMethodAndInvokeThisAsRaw(desc.get)
})
}
}
}
}
}
dropPrototypeRecursive(metaAttachCallBacks)
dropPrototypeRecursive(proxyInitCallbacks)
dropPrototypeRecursive(customTraps)
dropPrototypeRecursive(unwrapCallBacks)
dropPrototypeRecursive(trapHooks)
return currentWorld
}
}
export function createScript(obj: any) {
const keys = Object.keys(obj)
let text = `
(function (SES) {
"use strict";
`
for (let key of keys) {
text += `
const ${key} = ${Reflect.apply(
typeof obj[key] === 'function'
? Function.prototype.toString
: typeof obj[key] === 'boolean'
? Boolean.prototype.toString
: Object.prototype.toString
,
obj[key],
[]
)}
`
}
for (let key of keys) {
text += `
SES.${key} = ${key}
`
}
text += `
return SES
})({})
`
return text
}
/* istanbul ignore next */ export async function fastInit(
root: any,
configureCallback ?: API.ConfigureCallback,
remoteConfigureCallback ?: API.ConfigureCallback | string,
remoteRootExpr = "globalThis",
options: { fixInternalSlot: boolean} = { fixInternalSlot: false}
) {
let iframe = document.createElement('iframe')
iframe.src = 'about:blank'
iframe.setAttribute('sandbox', 'allow-same-origin allow-scripts');
iframe.style.display = 'none'
document.body.append(iframe)
await Promise.race([
new Promise(resolve => iframe.onload = resolve),
new Promise(resolve => setTimeout(resolve, 100))
])
const createRoot = init(configureCallback)
const server = createRoot(root, options)
let realm = (iframe.contentWindow as any).eval(`
"use strict";
const SES = ${createScript(SES)}
const createRoot = SES.init(${remoteConfigureCallback ? remoteConfigureCallback.toString() : ''})
const server = createRoot(${remoteRootExpr}, ${JSON.stringify(options)})
server
//# sourceURL=sandbox-service:/SES.js
`)
delete (iframe.contentWindow as any).opener
const remote = server.create(realm)
if (SES.DEV) {
console.error('iframe is not detached in DEV mode')
} else {
// say good bye to the iframe, even ourself can't access the `real` sandbox object after this point
iframe.remove()
}
return remote
}
export function fastInitNode(root: any, configureCallback ?: API.ConfigureCallback, remoteConfigureCallback ?: API.ConfigureCallback | string) {
const createRoot = init(configureCallback)
const server = createRoot(root)
const rawRealGlobalExpr = `(0, eval)("'use strict'; this")`
let script = createScript(SES)
let fullScript = `
"use strict";
const SES = ${script}
const createRoot = SES.init(${remoteConfigureCallback ? remoteConfigureCallback.toString() : ''})
const server = createRoot(${rawRealGlobalExpr})
server
`
/* istanbul ignore next */ if (process.env.NODE_ENV === 'test' && /cov_[a-zA-Z0-9]+/.test(fullScript)) {
// use prebuilds
/* istanbul ignore next */
const preBuild = eval(`
"use strict";
const path = require('path')
const file = require('fs').readFileSync(path.resolve(__dirname, './test/dist.js'), { encoding: 'utf8' })
file
`)
fullScript = `
"use strict";
const SES = ${preBuild}
const createRoot = SES.init(${remoteConfigureCallback ? remoteConfigureCallback.toString() : ''})
const server = createRoot(${rawRealGlobalExpr})
server
`
}
const { runInNewContext } = require('vm')
let sandboxGlobal = runInNewContext(rawRealGlobalExpr)
let realm = sandboxGlobal.eval(fullScript)
sandboxGlobal = null // throw the reference away
const remote = server.create(realm)
return remote
}
export default SES |