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const {
Error,
ObjectDefineProperties,
ObjectGetOwnPropertyDescriptors,
ObjectGetPrototypeOf,
ObjectSetPrototypeOf,
ObjectValues,
ReflectConstruct,
StringPrototypeSplit,
} = primordials;
const {
messaging_deserialize_symbol,
messaging_transfer_symbol,
messaging_clone_symbol,
messaging_transfer_list_symbol
} = internalBinding('symbols');
const {
JSTransferable,
setDeserializerCreateObjectFunction
} = internalBinding('messaging');
function setup() {
// Register the handler that will be used when deserializing JS-based objects
// from .postMessage() calls. The format of `deserializeInfo` is generally
// 'module:Constructor', e.g. 'internal/fs/promises:FileHandle'.
setDeserializerCreateObjectFunction((deserializeInfo) => {
const { 0: module, 1: ctor } = StringPrototypeSplit(deserializeInfo, ':');
const Ctor = require(module)[ctor];
if (typeof Ctor !== 'function' ||
typeof Ctor.prototype[messaging_deserialize_symbol] !== 'function') {
// Not one of the official errors because one should not be able to get
// here without messing with Node.js internals.
// eslint-disable-next-line no-restricted-syntax
throw new Error(`Unknown deserialize spec ${deserializeInfo}`);
}
return new Ctor();
});
}
function makeTransferable(obj) {
// If the object is already transferable, skip all this.
if (obj instanceof JSTransferable) return obj;
const inst = ReflectConstruct(JSTransferable, [], obj.constructor);
const properties = ObjectGetOwnPropertyDescriptors(obj);
const propertiesValues = ObjectValues(properties);
for (let i = 0; i < propertiesValues.length; i++) {
// We want to use null-prototype objects to not rely on globally mutable
// %Object.prototype%.
ObjectSetPrototypeOf(propertiesValues[i], null);
}
ObjectDefineProperties(inst, properties);
ObjectSetPrototypeOf(inst, ObjectGetPrototypeOf(obj));
return inst;
}
module.exports = {
makeTransferable,
setup,
JSTransferable,
kClone: messaging_clone_symbol,
kDeserialize: messaging_deserialize_symbol,
kTransfer: messaging_transfer_symbol,
kTransferList: messaging_transfer_list_symbol,
};
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