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Mini Shell
Mini Shell
/* global host, bridge, data, context */
'use strict';
const {
Object: localObject,
Array: localArray,
Error: LocalError,
Reflect: localReflect,
Proxy: LocalProxy,
WeakMap: LocalWeakMap,
Function: localFunction,
Promise: localPromise,
eval: localEval
} = global;
const {
freeze: localObjectFreeze
} = localObject;
const {
getPrototypeOf: localReflectGetPrototypeOf,
apply: localReflectApply,
deleteProperty: localReflectDeleteProperty,
has: localReflectHas,
defineProperty: localReflectDefineProperty,
setPrototypeOf: localReflectSetPrototypeOf,
getOwnPropertyDescriptor: localReflectGetOwnPropertyDescriptor
} = localReflect;
const {
isArray: localArrayIsArray
} = localArray;
const {
ensureThis,
ReadOnlyHandler,
from,
fromWithFactory,
readonlyFactory,
connect,
addProtoMapping,
VMError,
ReadOnlyMockHandler
} = bridge;
const {
allowAsync,
GeneratorFunction,
AsyncFunction,
AsyncGeneratorFunction
} = data;
const {
get: localWeakMapGet,
set: localWeakMapSet
} = LocalWeakMap.prototype;
function localUnexpected() {
return new VMError('Should not happen');
}
// global is originally prototype of host.Object so it can be used to climb up from the sandbox.
if (!localReflectSetPrototypeOf(context, localObject.prototype)) throw localUnexpected();
Object.defineProperties(global, {
global: {value: global, writable: true, configurable: true, enumerable: true},
globalThis: {value: global, writable: true, configurable: true},
GLOBAL: {value: global, writable: true, configurable: true},
root: {value: global, writable: true, configurable: true}
});
if (!localReflectDefineProperty(global, 'VMError', {
__proto__: null,
value: VMError,
writable: true,
enumerable: false,
configurable: true
})) throw localUnexpected();
// Fixes buffer unsafe allocation
/* eslint-disable no-use-before-define */
class BufferHandler extends ReadOnlyHandler {
apply(target, thiz, args) {
if (args.length > 0 && typeof args[0] === 'number') {
return LocalBuffer.alloc(args[0]);
}
return localReflectApply(LocalBuffer.from, LocalBuffer, args);
}
construct(target, args, newTarget) {
if (args.length > 0 && typeof args[0] === 'number') {
return LocalBuffer.alloc(args[0]);
}
return localReflectApply(LocalBuffer.from, LocalBuffer, args);
}
}
/* eslint-enable no-use-before-define */
const LocalBuffer = fromWithFactory(obj => new BufferHandler(obj), host.Buffer);
if (!localReflectDefineProperty(global, 'Buffer', {
__proto__: null,
value: LocalBuffer,
writable: true,
enumerable: false,
configurable: true
})) throw localUnexpected();
addProtoMapping(LocalBuffer.prototype, host.Buffer.prototype, 'Uint8Array');
/**
*
* @param {*} size Size of new buffer
* @this LocalBuffer
* @return {LocalBuffer}
*/
function allocUnsafe(size) {
return LocalBuffer.alloc(size);
}
connect(allocUnsafe, host.Buffer.allocUnsafe);
/**
*
* @param {*} size Size of new buffer
* @this LocalBuffer
* @return {LocalBuffer}
*/
function allocUnsafeSlow(size) {
return LocalBuffer.alloc(size);
}
connect(allocUnsafeSlow, host.Buffer.allocUnsafeSlow);
/**
* Replacement for Buffer inspect
*
* @param {*} recurseTimes
* @param {*} ctx
* @this LocalBuffer
* @return {string}
*/
function inspect(recurseTimes, ctx) {
// Mimic old behavior, could throw but didn't pass a test.
const max = host.INSPECT_MAX_BYTES;
const actualMax = Math.min(max, this.length);
const remaining = this.length - max;
let str = this.hexSlice(0, actualMax).replace(/(.{2})/g, '$1 ').trim();
if (remaining > 0) str += ` ... ${remaining} more byte${remaining > 1 ? 's' : ''}`;
return `<${this.constructor.name} ${str}>`;
}
connect(inspect, host.Buffer.prototype.inspect);
connect(localFunction.prototype.bind, host.Function.prototype.bind);
connect(localObject.prototype.__defineGetter__, host.Object.prototype.__defineGetter__);
connect(localObject.prototype.__defineSetter__, host.Object.prototype.__defineSetter__);
connect(localObject.prototype.__lookupGetter__, host.Object.prototype.__lookupGetter__);
connect(localObject.prototype.__lookupSetter__, host.Object.prototype.__lookupSetter__);
/*
* PrepareStackTrace sanitization
*/
const oldPrepareStackTraceDesc = localReflectGetOwnPropertyDescriptor(LocalError, 'prepareStackTrace');
let currentPrepareStackTrace = LocalError.prepareStackTrace;
const wrappedPrepareStackTrace = new LocalWeakMap();
if (typeof currentPrepareStackTrace === 'function') {
wrappedPrepareStackTrace.set(currentPrepareStackTrace, currentPrepareStackTrace);
}
let OriginalCallSite;
LocalError.prepareStackTrace = (e, sst) => {
OriginalCallSite = sst[0].constructor;
};
new LocalError().stack;
if (typeof OriginalCallSite === 'function') {
LocalError.prepareStackTrace = undefined;
function makeCallSiteGetters(list) {
const callSiteGetters = [];
for (let i=0; i<list.length; i++) {
const name = list[i];
const func = OriginalCallSite.prototype[name];
callSiteGetters[i] = {__proto__: null,
name,
propName: '_' + name,
func: (thiz) => {
return localReflectApply(func, thiz, []);
}
};
}
return callSiteGetters;
}
function applyCallSiteGetters(thiz, callSite, getters) {
for (let i=0; i<getters.length; i++) {
const getter = getters[i];
localReflectDefineProperty(thiz, getter.propName, {
__proto__: null,
value: getter.func(callSite)
});
}
}
const callSiteGetters = makeCallSiteGetters([
'getTypeName',
'getFunctionName',
'getMethodName',
'getFileName',
'getLineNumber',
'getColumnNumber',
'getEvalOrigin',
'isToplevel',
'isEval',
'isNative',
'isConstructor',
'isAsync',
'isPromiseAll',
'getPromiseIndex'
]);
class CallSite {
constructor(callSite) {
applyCallSiteGetters(this, callSite, callSiteGetters);
}
getThis() {
return undefined;
}
getFunction() {
return undefined;
}
toString() {
return 'CallSite {}';
}
}
for (let i=0; i<callSiteGetters.length; i++) {
const name = callSiteGetters[i].name;
const funcProp = localReflectGetOwnPropertyDescriptor(OriginalCallSite.prototype, name);
if (!funcProp) continue;
const propertyName = callSiteGetters[i].propName;
const func = {func() {
return this[propertyName];
}}.func;
const nameProp = localReflectGetOwnPropertyDescriptor(func, 'name');
if (!nameProp) throw localUnexpected();
nameProp.value = name;
if (!localReflectDefineProperty(func, 'name', nameProp)) throw localUnexpected();
funcProp.value = func;
if (!localReflectDefineProperty(CallSite.prototype, name, funcProp)) throw localUnexpected();
}
if (!localReflectDefineProperty(LocalError, 'prepareStackTrace', {
configurable: false,
enumerable: false,
get() {
return currentPrepareStackTrace;
},
set(value) {
if (typeof(value) !== 'function') {
currentPrepareStackTrace = value;
return;
}
const wrapped = localReflectApply(localWeakMapGet, wrappedPrepareStackTrace, [value]);
if (wrapped) {
currentPrepareStackTrace = wrapped;
return;
}
const newWrapped = (error, sst) => {
if (localArrayIsArray(sst)) {
for (let i=0; i < sst.length; i++) {
const cs = sst[i];
if (typeof cs === 'object' && localReflectGetPrototypeOf(cs) === OriginalCallSite.prototype) {
sst[i] = new CallSite(cs);
}
}
}
return value(error, sst);
};
localReflectApply(localWeakMapSet, wrappedPrepareStackTrace, [value, newWrapped]);
localReflectApply(localWeakMapSet, wrappedPrepareStackTrace, [newWrapped, newWrapped]);
currentPrepareStackTrace = newWrapped;
}
})) throw localUnexpected();
} else if (oldPrepareStackTraceDesc) {
localReflectDefineProperty(LocalError, 'prepareStackTrace', oldPrepareStackTraceDesc);
} else {
localReflectDeleteProperty(LocalError, 'prepareStackTrace');
}
/*
* Exception sanitization
*/
const withProxy = localObjectFreeze({
__proto__: null,
has(target, key) {
if (key === host.INTERNAL_STATE_NAME) return false;
return localReflectHas(target, key);
}
});
const interanState = localObjectFreeze({
__proto__: null,
wrapWith(x) {
if (x === null || x === undefined) return x;
return new LocalProxy(localObject(x), withProxy);
},
handleException: ensureThis,
import(what) {
throw new VMError('Dynamic Import not supported');
}
});
if (!localReflectDefineProperty(global, host.INTERNAL_STATE_NAME, {
__proto__: null,
configurable: false,
enumerable: false,
writable: false,
value: interanState
})) throw localUnexpected();
/*
* Eval sanitization
*/
function throwAsync() {
return new VMError('Async not available');
}
function makeFunction(inputArgs, isAsync, isGenerator) {
const lastArgs = inputArgs.length - 1;
let code = lastArgs >= 0 ? `${inputArgs[lastArgs]}` : '';
let args = lastArgs > 0 ? `${inputArgs[0]}` : '';
for (let i = 1; i < lastArgs; i++) {
args += `,${inputArgs[i]}`;
}
try {
code = host.transformAndCheck(args, code, isAsync, isGenerator, allowAsync);
} catch (e) {
throw bridge.from(e);
}
return localEval(code);
}
const FunctionHandler = {
__proto__: null,
apply(target, thiz, args) {
return makeFunction(args, this.isAsync, this.isGenerator);
},
construct(target, args, newTarget) {
return makeFunction(args, this.isAsync, this.isGenerator);
}
};
const EvalHandler = {
__proto__: null,
apply(target, thiz, args) {
if (args.length === 0) return undefined;
let code = `${args[0]}`;
try {
code = host.transformAndCheck(null, code, false, false, allowAsync);
} catch (e) {
throw bridge.from(e);
}
return localEval(code);
}
};
const AsyncErrorHandler = {
__proto__: null,
apply(target, thiz, args) {
throw throwAsync();
},
construct(target, args, newTarget) {
throw throwAsync();
}
};
function makeCheckFunction(isAsync, isGenerator) {
if (isAsync && !allowAsync) return AsyncErrorHandler;
return {
__proto__: FunctionHandler,
isAsync,
isGenerator
};
}
function overrideWithProxy(obj, prop, value, handler) {
const proxy = new LocalProxy(value, handler);
if (!localReflectDefineProperty(obj, prop, {__proto__: null, value: proxy})) throw localUnexpected();
return proxy;
}
const proxiedFunction = overrideWithProxy(localFunction.prototype, 'constructor', localFunction, makeCheckFunction(false, false));
if (GeneratorFunction) {
if (!localReflectSetPrototypeOf(GeneratorFunction, proxiedFunction)) throw localUnexpected();
overrideWithProxy(GeneratorFunction.prototype, 'constructor', GeneratorFunction, makeCheckFunction(false, true));
}
if (AsyncFunction) {
if (!localReflectSetPrototypeOf(AsyncFunction, proxiedFunction)) throw localUnexpected();
overrideWithProxy(AsyncFunction.prototype, 'constructor', AsyncFunction, makeCheckFunction(true, false));
}
if (AsyncGeneratorFunction) {
if (!localReflectSetPrototypeOf(AsyncGeneratorFunction, proxiedFunction)) throw localUnexpected();
overrideWithProxy(AsyncGeneratorFunction.prototype, 'constructor', AsyncGeneratorFunction, makeCheckFunction(true, true));
}
global.Function = proxiedFunction;
global.eval = new LocalProxy(localEval, EvalHandler);
/*
* Promise sanitization
*/
if (localPromise && !allowAsync) {
const PromisePrototype = localPromise.prototype;
overrideWithProxy(PromisePrototype, 'then', PromisePrototype.then, AsyncErrorHandler);
// This seems not to work, and will produce
// UnhandledPromiseRejectionWarning: TypeError: Method Promise.prototype.then called on incompatible receiver [object Object].
// This is likely caused since the host.Promise.prototype.then cannot use the VM Proxy object.
// Contextify.connect(host.Promise.prototype.then, Promise.prototype.then);
if (PromisePrototype.finally) {
overrideWithProxy(PromisePrototype, 'finally', PromisePrototype.finally, AsyncErrorHandler);
// Contextify.connect(host.Promise.prototype.finally, Promise.prototype.finally);
}
if (Promise.prototype.catch) {
overrideWithProxy(PromisePrototype, 'catch', PromisePrototype.catch, AsyncErrorHandler);
// Contextify.connect(host.Promise.prototype.catch, Promise.prototype.catch);
}
}
function readonly(other, mock) {
// Note: other@other(unsafe) mock@other(unsafe) returns@this(unsafe) throws@this(unsafe)
if (!mock) return fromWithFactory(readonlyFactory, other);
const tmock = from(mock);
return fromWithFactory(obj=>new ReadOnlyMockHandler(obj, tmock), other);
}
return {
__proto__: null,
readonly,
global
};
Zerion Mini Shell 1.0