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| 1 | + |
| 2 | +const fs = require('fs'); |
| 3 | +const nmod = require('module'); |
| 4 | +const {EventEmitter} = require('events'); |
| 5 | +const util = require('util'); |
| 6 | +const {VMScript} = require('./script'); |
| 7 | +const {VM} = require('./vm'); |
| 8 | + |
| 9 | +const eventsModules = new WeakMap(); |
| 10 | + |
| 11 | +function defaultBuiltinLoaderEvents(vm) { |
| 12 | + return eventsModules.get(vm); |
| 13 | +} |
| 14 | + |
| 15 | +let cacheBufferScript; |
| 16 | + |
| 17 | +function defaultBuiltinLoaderBuffer(vm) { |
| 18 | + if (!cacheBufferScript) { |
| 19 | + cacheBufferScript = new VMScript('return buffer=>({Buffer: buffer});', {__proto__: null, filename: 'buffer.js'}); |
| 20 | + } |
| 21 | + const makeBuffer = vm.run(cacheBufferScript, {__proto__: null, strict: true, wrapper: 'none'}); |
| 22 | + return makeBuffer(Buffer); |
| 23 | +} |
| 24 | + |
| 25 | +let cacheUtilScript; |
| 26 | + |
| 27 | +function defaultBuiltinLoaderUtil(vm) { |
| 28 | + if (!cacheUtilScript) { |
| 29 | + cacheUtilScript = new VMScript(`return function inherits(ctor, superCtor) { |
| 30 | + ctor.super_ = superCtor; |
| 31 | + Object.setPrototypeOf(ctor.prototype, superCtor.prototype); |
| 32 | + }`, {__proto__: null, filename: 'util.js'}); |
| 33 | + } |
| 34 | + const inherits = vm.run(cacheUtilScript, {__proto__: null, strict: true, wrapper: 'none'}); |
| 35 | + const copy = Object.assign({}, util); |
| 36 | + copy.inherits = inherits; |
| 37 | + return vm.readonly(copy); |
| 38 | +} |
| 39 | + |
| 40 | +const BUILTIN_MODULES = (nmod.builtinModules || Object.getOwnPropertyNames(process.binding('natives'))).filter(s=>!s.startsWith('internal/')); |
| 41 | + |
| 42 | +let EventEmitterReferencingAsyncResourceClass = null; |
| 43 | +if (EventEmitter.EventEmitterAsyncResource) { |
| 44 | + // eslint-disable-next-line global-require |
| 45 | + const {AsyncResource} = require('async_hooks'); |
| 46 | + const kEventEmitter = Symbol('kEventEmitter'); |
| 47 | + class EventEmitterReferencingAsyncResource extends AsyncResource { |
| 48 | + constructor(ee, type, options) { |
| 49 | + super(type, options); |
| 50 | + this[kEventEmitter] = ee; |
| 51 | + } |
| 52 | + get eventEmitter() { |
| 53 | + return this[kEventEmitter]; |
| 54 | + } |
| 55 | + } |
| 56 | + EventEmitterReferencingAsyncResourceClass = EventEmitterReferencingAsyncResource; |
| 57 | +} |
| 58 | + |
| 59 | +let cacheEventsScript; |
| 60 | + |
| 61 | +const SPECIAL_MODULES = { |
| 62 | + events: { |
| 63 | + init(vm) { |
| 64 | + if (!cacheEventsScript) { |
| 65 | + const eventsSource = fs.readFileSync(`${__dirname}/events.js`, 'utf8'); |
| 66 | + cacheEventsScript = new VMScript(`(function (fromhost) { const module = {}; module.exports={};{ ${eventsSource} |
| 67 | + } return module.exports;})`, {filename: 'events.js'}); |
| 68 | + } |
| 69 | + const closure = VM.prototype.run.call(vm, cacheEventsScript); |
| 70 | + const eventsInstance = closure(vm.readonly({ |
| 71 | + kErrorMonitor: EventEmitter.errorMonitor, |
| 72 | + once: EventEmitter.once, |
| 73 | + on: EventEmitter.on, |
| 74 | + getEventListeners: EventEmitter.getEventListeners, |
| 75 | + EventEmitterReferencingAsyncResource: EventEmitterReferencingAsyncResourceClass |
| 76 | + })); |
| 77 | + eventsModules.set(vm, eventsInstance); |
| 78 | + vm._addProtoMapping(EventEmitter.prototype, eventsInstance.EventEmitter.prototype); |
| 79 | + }, |
| 80 | + load: defaultBuiltinLoaderEvents |
| 81 | + }, |
| 82 | + buffer: defaultBuiltinLoaderBuffer, |
| 83 | + util: defaultBuiltinLoaderUtil |
| 84 | +}; |
| 85 | + |
| 86 | +function addDefaultBuiltin(builtins, key, hostRequire) { |
| 87 | + if (builtins.has(key)) return; |
| 88 | + const special = SPECIAL_MODULES[key]; |
| 89 | + builtins.set(key, special ? special : vm => vm.readonly(hostRequire(key))); |
| 90 | +} |
| 91 | + |
| 92 | + |
| 93 | +function makeBuiltinsFromLegacyOptions(builtins, hostRequire, mocks, overrides) { |
| 94 | + const res = new Map(); |
| 95 | + if (mocks) { |
| 96 | + const keys = Object.getOwnPropertyNames(mocks); |
| 97 | + for (let i = 0; i < keys.length; i++) { |
| 98 | + const key = keys[i]; |
| 99 | + res.set(key, (tvm) => tvm.readonly(mocks[key])); |
| 100 | + } |
| 101 | + } |
| 102 | + if (overrides) { |
| 103 | + const keys = Object.getOwnPropertyNames(overrides); |
| 104 | + for (let i = 0; i < keys.length; i++) { |
| 105 | + const key = keys[i]; |
| 106 | + res.set(key, overrides[key]); |
| 107 | + } |
| 108 | + } |
| 109 | + if (Array.isArray(builtins)) { |
| 110 | + const def = builtins.indexOf('*') >= 0; |
| 111 | + if (def) { |
| 112 | + for (let i = 0; i < BUILTIN_MODULES.length; i++) { |
| 113 | + const name = BUILTIN_MODULES[i]; |
| 114 | + if (builtins.indexOf(`-${name}`) === -1) { |
| 115 | + addDefaultBuiltin(res, name, hostRequire); |
| 116 | + } |
| 117 | + } |
| 118 | + } else { |
| 119 | + for (let i = 0; i < BUILTIN_MODULES.length; i++) { |
| 120 | + const name = BUILTIN_MODULES[i]; |
| 121 | + if (builtins.indexOf(name) !== -1) { |
| 122 | + addDefaultBuiltin(res, name, hostRequire); |
| 123 | + } |
| 124 | + } |
| 125 | + } |
| 126 | + } else if (builtins) { |
| 127 | + for (let i = 0; i < BUILTIN_MODULES.length; i++) { |
| 128 | + const name = BUILTIN_MODULES[i]; |
| 129 | + if (builtins[name]) { |
| 130 | + addDefaultBuiltin(res, name, hostRequire); |
| 131 | + } |
| 132 | + } |
| 133 | + } |
| 134 | + return res; |
| 135 | +} |
| 136 | + |
| 137 | +function makeBuiltins(builtins, hostRequire) { |
| 138 | + const res = new Map(); |
| 139 | + for (let i = 0; i < builtins.length; i++) { |
| 140 | + const name = builtins[i]; |
| 141 | + addDefaultBuiltin(res, name, hostRequire); |
| 142 | + } |
| 143 | + return res; |
| 144 | +} |
| 145 | + |
| 146 | +exports.makeBuiltinsFromLegacyOptions = makeBuiltinsFromLegacyOptions; |
| 147 | +exports.makeBuiltins = makeBuiltins; |
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