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Mini Shell
Mini Shell
'use strict';
// Translate the old options to the new Resolver functionality.
const fs = require('fs');
const pa = require('path');
const nmod = require('module');
const {EventEmitter} = require('events');
const util = require('util');
const {
Resolver,
DefaultResolver
} = require('./resolver');
const {VMScript} = require('./script');
const {VM} = require('./vm');
const {VMError} = require('./bridge');
/**
* Require wrapper to be able to annotate require with webpackIgnore.
*
* @private
* @param {string} moduleName - Name of module to load.
* @return {*} Module exports.
*/
function defaultRequire(moduleName) {
// Set module.parser.javascript.commonjsMagicComments=true in your webpack config.
// eslint-disable-next-line global-require
return require(/* webpackIgnore: true */ moduleName);
}
// source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#Escaping
function escapeRegExp(string) {
return string.replace(/[.*+\-?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}
function makeExternalMatcherRegex(obj) {
return escapeRegExp(obj).replace(/\\\\|\//g, '[\\\\/]')
.replace(/\\\*\\\*/g, '.*').replace(/\\\*/g, '[^\\\\/]*').replace(/\\\?/g, '[^\\\\/]');
}
function makeExternalMatcher(obj) {
const regexString = makeExternalMatcherRegex(obj);
return new RegExp(`[\\\\/]node_modules[\\\\/]${regexString}(?:[\\\\/](?!(?:.*[\\\\/])?node_modules[\\\\/]).*)?$`);
}
class LegacyResolver extends DefaultResolver {
constructor(builtinModules, checkPath, globalPaths, pathContext, customResolver, hostRequire, compiler, externals, allowTransitive) {
super(builtinModules, checkPath, globalPaths, pathContext, customResolver, hostRequire, compiler);
this.externals = externals;
this.currMod = undefined;
this.trustedMods = new WeakMap();
this.allowTransitive = allowTransitive;
}
isPathAllowed(path) {
return this.isPathAllowedForModule(path, this.currMod);
}
isPathAllowedForModule(path, mod) {
if (!super.isPathAllowed(path)) return false;
if (mod) {
if (mod.allowTransitive) return true;
if (path.startsWith(mod.path)) {
const rem = path.slice(mod.path.length);
if (!/(?:^|[\\\\/])node_modules(?:$|[\\\\/])/.test(rem)) return true;
}
}
return this.externals.some(regex => regex.test(path));
}
registerModule(mod, filename, path, parent, direct) {
const trustedParent = this.trustedMods.get(parent);
this.trustedMods.set(mod, {
filename,
path,
paths: this.genLookupPaths(path),
allowTransitive: this.allowTransitive &&
((direct && trustedParent && trustedParent.allowTransitive) || this.externals.some(regex => regex.test(filename)))
});
}
resolveFull(mod, x, options, ext, direct) {
this.currMod = undefined;
if (!direct) return super.resolveFull(mod, x, options, ext, false);
const trustedMod = this.trustedMods.get(mod);
if (!trustedMod || mod.path !== trustedMod.path) return super.resolveFull(mod, x, options, ext, false);
const paths = [...mod.paths];
if (paths.length === trustedMod.length) {
for (let i = 0; i < paths.length; i++) {
if (paths[i] !== trustedMod.paths[i]) {
return super.resolveFull(mod, x, options, ext, false);
}
}
}
const extCopy = Object.assign({__proto__: null}, ext);
try {
this.currMod = trustedMod;
return super.resolveFull(trustedMod, x, undefined, extCopy, true);
} finally {
this.currMod = undefined;
}
}
checkAccess(mod, filename) {
const trustedMod = this.trustedMods.get(mod);
if ((!trustedMod || trustedMod.filename !== filename) && !this.isPathAllowedForModule(filename, undefined)) {
throw new VMError(`Module '${filename}' is not allowed to be required. The path is outside the border!`, 'EDENIED');
}
}
loadJS(vm, mod, filename) {
filename = this.pathResolve(filename);
this.checkAccess(mod, filename);
if (this.pathContext(filename, 'js') === 'sandbox') {
const trustedMod = this.trustedMods.get(mod);
const script = this.readScript(filename);
vm.run(script, {filename, strict: true, module: mod, wrapper: 'none', dirname: trustedMod ? trustedMod.path : mod.path});
} else {
const m = this.hostRequire(filename);
mod.exports = vm.readonly(m);
}
}
}
function defaultBuiltinLoader(resolver, vm, id) {
const mod = resolver.hostRequire(id);
return vm.readonly(mod);
}
const eventsModules = new WeakMap();
function defaultBuiltinLoaderEvents(resolver, vm, id) {
return eventsModules.get(vm);
}
let cacheBufferScript;
function defaultBuiltinLoaderBuffer(resolver, vm, id) {
if (!cacheBufferScript) {
cacheBufferScript = new VMScript('return buffer=>({Buffer: buffer});', {__proto__: null, filename: 'buffer.js'});
}
const makeBuffer = vm.run(cacheBufferScript, {__proto__: null, strict: true, wrapper: 'none'});
return makeBuffer(Buffer);
}
let cacheUtilScript;
function defaultBuiltinLoaderUtil(resolver, vm, id) {
if (!cacheUtilScript) {
cacheUtilScript = new VMScript(`return function inherits(ctor, superCtor) {
ctor.super_ = superCtor;
Object.setPrototypeOf(ctor.prototype, superCtor.prototype);
}`, {__proto__: null, filename: 'util.js'});
}
const inherits = vm.run(cacheUtilScript, {__proto__: null, strict: true, wrapper: 'none'});
const copy = Object.assign({}, util);
copy.inherits = inherits;
return vm.readonly(copy);
}
const BUILTIN_MODULES = (nmod.builtinModules || Object.getOwnPropertyNames(process.binding('natives'))).filter(s=>!s.startsWith('internal/'));
let EventEmitterReferencingAsyncResourceClass = null;
if (EventEmitter.EventEmitterAsyncResource) {
// eslint-disable-next-line global-require
const {AsyncResource} = require('async_hooks');
const kEventEmitter = Symbol('kEventEmitter');
class EventEmitterReferencingAsyncResource extends AsyncResource {
constructor(ee, type, options) {
super(type, options);
this[kEventEmitter] = ee;
}
get eventEmitter() {
return this[kEventEmitter];
}
}
EventEmitterReferencingAsyncResourceClass = EventEmitterReferencingAsyncResource;
}
let cacheEventsScript;
const SPECIAL_MODULES = {
events(vm) {
if (!cacheEventsScript) {
const eventsSource = fs.readFileSync(`${__dirname}/events.js`, 'utf8');
cacheEventsScript = new VMScript(`(function (fromhost) { const module = {}; module.exports={};{ ${eventsSource}
} return module.exports;})`, {filename: 'events.js'});
}
const closure = VM.prototype.run.call(vm, cacheEventsScript);
const eventsInstance = closure(vm.readonly({
kErrorMonitor: EventEmitter.errorMonitor,
once: EventEmitter.once,
on: EventEmitter.on,
getEventListeners: EventEmitter.getEventListeners,
EventEmitterReferencingAsyncResource: EventEmitterReferencingAsyncResourceClass
}));
eventsModules.set(vm, eventsInstance);
vm._addProtoMapping(EventEmitter.prototype, eventsInstance.EventEmitter.prototype);
return defaultBuiltinLoaderEvents;
},
buffer(vm) {
return defaultBuiltinLoaderBuffer;
},
util(vm) {
return defaultBuiltinLoaderUtil;
}
};
function addDefaultBuiltin(builtins, key, vm) {
if (builtins[key]) return;
const special = SPECIAL_MODULES[key];
builtins[key] = special ? special(vm) : defaultBuiltinLoader;
}
function genBuiltinsFromOptions(vm, builtinOpt, mockOpt, override) {
const builtins = {__proto__: null};
if (mockOpt) {
const keys = Object.getOwnPropertyNames(mockOpt);
for (let i = 0; i < keys.length; i++) {
const key = keys[i];
builtins[key] = (resolver, tvm, id) => tvm.readonly(mockOpt[key]);
}
}
if (override) {
const keys = Object.getOwnPropertyNames(override);
for (let i = 0; i < keys.length; i++) {
const key = keys[i];
builtins[key] = override[key];
}
}
if (Array.isArray(builtinOpt)) {
const def = builtinOpt.indexOf('*') >= 0;
if (def) {
for (let i = 0; i < BUILTIN_MODULES.length; i++) {
const name = BUILTIN_MODULES[i];
if (builtinOpt.indexOf(`-${name}`) === -1) {
addDefaultBuiltin(builtins, name, vm);
}
}
} else {
for (let i = 0; i < BUILTIN_MODULES.length; i++) {
const name = BUILTIN_MODULES[i];
if (builtinOpt.indexOf(name) !== -1) {
addDefaultBuiltin(builtins, name, vm);
}
}
}
} else if (builtinOpt) {
for (let i = 0; i < BUILTIN_MODULES.length; i++) {
const name = BUILTIN_MODULES[i];
if (builtinOpt[name]) {
addDefaultBuiltin(builtins, name, vm);
}
}
}
return builtins;
}
function defaultCustomResolver() {
return undefined;
}
const DENY_RESOLVER = new Resolver({__proto__: null}, [], id => {
throw new VMError(`Access denied to require '${id}'`, 'EDENIED');
});
function resolverFromOptions(vm, options, override, compiler) {
if (!options) {
if (!override) return DENY_RESOLVER;
const builtins = genBuiltinsFromOptions(vm, undefined, undefined, override);
return new Resolver(builtins, [], defaultRequire);
}
const {
builtin: builtinOpt,
mock: mockOpt,
external: externalOpt,
root: rootPaths,
resolve: customResolver,
customRequire: hostRequire = defaultRequire,
context = 'host'
} = options;
const builtins = genBuiltinsFromOptions(vm, builtinOpt, mockOpt, override);
if (!externalOpt) return new Resolver(builtins, [], hostRequire);
let checkPath;
if (rootPaths) {
const checkedRootPaths = (Array.isArray(rootPaths) ? rootPaths : [rootPaths]).map(f => pa.resolve(f));
checkPath = (filename) => {
return checkedRootPaths.some(path => {
if (!filename.startsWith(path)) return false;
const len = path.length;
if (filename.length === len || (len > 0 && path[len-1] === pa.sep)) return true;
const sep = filename[len];
return sep === '/' || sep === pa.sep;
});
};
} else {
checkPath = () => true;
}
let newCustomResolver = defaultCustomResolver;
let externals = undefined;
let external = undefined;
if (customResolver) {
let externalCache;
newCustomResolver = (resolver, x, path, extList) => {
if (external && !(resolver.pathIsAbsolute(x) || resolver.pathIsRelative(x))) {
if (!externalCache) {
externalCache = external.map(ext => new RegExp(makeExternalMatcherRegex(ext)));
}
if (!externalCache.some(regex => regex.test(x))) return undefined;
}
const resolved = customResolver(x, path);
if (!resolved) return undefined;
if (externals) externals.push(new RegExp('^' + escapeRegExp(resolved)));
return resolver.loadAsFileOrDirecotry(resolved, extList);
};
}
if (typeof externalOpt !== 'object') {
return new DefaultResolver(builtins, checkPath, [], () => context, newCustomResolver, hostRequire, compiler);
}
let transitive = false;
if (Array.isArray(externalOpt)) {
external = externalOpt;
} else {
external = externalOpt.modules;
transitive = context === 'sandbox' && externalOpt.transitive;
}
externals = external.map(makeExternalMatcher);
return new LegacyResolver(builtins, checkPath, [], () => context, newCustomResolver, hostRequire, compiler, externals, transitive);
}
exports.resolverFromOptions = resolverFromOptions;
Zerion Mini Shell 1.0