356 lines
11 KiB
JavaScript
356 lines
11 KiB
JavaScript
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'use strict'
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const v8Util = process.atomBinding('v8_util')
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const { isPromise } = require('electron')
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const resolvePromise = Promise.resolve.bind(Promise)
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const CallbacksRegistry = require('@electron/internal/renderer/callbacks-registry')
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const bufferUtils = require('@electron/internal/common/buffer-utils')
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const errorUtils = require('@electron/internal/common/error-utils')
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const ipcRenderer = require('@electron/internal/renderer/ipc-renderer-internal')
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const callbacksRegistry = new CallbacksRegistry()
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const remoteObjectCache = v8Util.createIDWeakMap()
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// An unique ID that can represent current context.
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const contextId = v8Util.getHiddenValue(global, 'contextId')
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// Notify the main process when current context is going to be released.
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// Note that when the renderer process is destroyed, the message may not be
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// sent, we also listen to the "render-view-deleted" event in the main process
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// to guard that situation.
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process.on('exit', () => {
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const command = 'ELECTRON_BROWSER_CONTEXT_RELEASE'
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ipcRenderer.sendSync(command, contextId)
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})
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// Convert the arguments object into an array of meta data.
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function wrapArgs (args, visited = new Set()) {
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const valueToMeta = (value) => {
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// Check for circular reference.
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if (visited.has(value)) {
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return {
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type: 'value',
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value: null
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}
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}
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if (Array.isArray(value)) {
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visited.add(value)
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const meta = {
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type: 'array',
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value: wrapArgs(value, visited)
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}
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visited.delete(value)
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return meta
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} else if (bufferUtils.isBuffer(value)) {
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return {
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type: 'buffer',
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value: bufferUtils.bufferToMeta(value)
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}
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} else if (value instanceof Date) {
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return {
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type: 'date',
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value: value.getTime()
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}
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} else if ((value != null) && typeof value === 'object') {
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if (isPromise(value)) {
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return {
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type: 'promise',
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then: valueToMeta(function (onFulfilled, onRejected) {
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value.then(onFulfilled, onRejected)
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})
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}
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} else if (v8Util.getHiddenValue(value, 'atomId')) {
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return {
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type: 'remote-object',
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id: v8Util.getHiddenValue(value, 'atomId')
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}
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}
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const meta = {
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type: 'object',
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name: value.constructor ? value.constructor.name : '',
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members: []
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}
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visited.add(value)
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for (const prop in value) {
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meta.members.push({
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name: prop,
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value: valueToMeta(value[prop])
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})
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}
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visited.delete(value)
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return meta
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} else if (typeof value === 'function' && v8Util.getHiddenValue(value, 'returnValue')) {
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return {
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type: 'function-with-return-value',
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value: valueToMeta(value())
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}
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} else if (typeof value === 'function') {
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return {
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type: 'function',
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id: callbacksRegistry.add(value),
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location: v8Util.getHiddenValue(value, 'location'),
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length: value.length
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}
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} else {
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return {
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type: 'value',
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value: value
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}
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}
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}
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return args.map(valueToMeta)
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}
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// Populate object's members from descriptors.
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// The |ref| will be kept referenced by |members|.
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// This matches |getObjectMemebers| in rpc-server.
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function setObjectMembers (ref, object, metaId, members) {
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if (!Array.isArray(members)) return
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for (const member of members) {
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if (object.hasOwnProperty(member.name)) continue
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const descriptor = { enumerable: member.enumerable }
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if (member.type === 'method') {
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const remoteMemberFunction = function (...args) {
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let command
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if (this && this.constructor === remoteMemberFunction) {
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command = 'ELECTRON_BROWSER_MEMBER_CONSTRUCTOR'
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} else {
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command = 'ELECTRON_BROWSER_MEMBER_CALL'
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}
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const ret = ipcRenderer.sendSync(command, contextId, metaId, member.name, wrapArgs(args))
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return metaToValue(ret)
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}
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let descriptorFunction = proxyFunctionProperties(remoteMemberFunction, metaId, member.name)
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descriptor.get = () => {
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descriptorFunction.ref = ref // The member should reference its object.
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return descriptorFunction
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}
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// Enable monkey-patch the method
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descriptor.set = (value) => {
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descriptorFunction = value
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return value
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}
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descriptor.configurable = true
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} else if (member.type === 'get') {
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descriptor.get = () => {
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const command = 'ELECTRON_BROWSER_MEMBER_GET'
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const meta = ipcRenderer.sendSync(command, contextId, metaId, member.name)
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return metaToValue(meta)
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}
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if (member.writable) {
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descriptor.set = (value) => {
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const args = wrapArgs([value])
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const command = 'ELECTRON_BROWSER_MEMBER_SET'
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const meta = ipcRenderer.sendSync(command, contextId, metaId, member.name, args)
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if (meta != null) metaToValue(meta)
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return value
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}
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}
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}
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Object.defineProperty(object, member.name, descriptor)
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}
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}
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// Populate object's prototype from descriptor.
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// This matches |getObjectPrototype| in rpc-server.
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function setObjectPrototype (ref, object, metaId, descriptor) {
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if (descriptor === null) return
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const proto = {}
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setObjectMembers(ref, proto, metaId, descriptor.members)
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setObjectPrototype(ref, proto, metaId, descriptor.proto)
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Object.setPrototypeOf(object, proto)
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}
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// Wrap function in Proxy for accessing remote properties
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function proxyFunctionProperties (remoteMemberFunction, metaId, name) {
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let loaded = false
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// Lazily load function properties
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const loadRemoteProperties = () => {
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if (loaded) return
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loaded = true
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const command = 'ELECTRON_BROWSER_MEMBER_GET'
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const meta = ipcRenderer.sendSync(command, contextId, metaId, name)
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setObjectMembers(remoteMemberFunction, remoteMemberFunction, meta.id, meta.members)
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}
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return new Proxy(remoteMemberFunction, {
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set: (target, property, value, receiver) => {
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if (property !== 'ref') loadRemoteProperties()
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target[property] = value
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return true
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},
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get: (target, property, receiver) => {
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if (!target.hasOwnProperty(property)) loadRemoteProperties()
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const value = target[property]
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if (property === 'toString' && typeof value === 'function') {
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return value.bind(target)
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}
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return value
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},
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ownKeys: (target) => {
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loadRemoteProperties()
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return Object.getOwnPropertyNames(target)
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},
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getOwnPropertyDescriptor: (target, property) => {
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const descriptor = Object.getOwnPropertyDescriptor(target, property)
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if (descriptor) return descriptor
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loadRemoteProperties()
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return Object.getOwnPropertyDescriptor(target, property)
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}
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})
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}
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// Convert meta data from browser into real value.
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function metaToValue (meta) {
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const types = {
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value: () => meta.value,
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array: () => meta.members.map((member) => metaToValue(member)),
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buffer: () => bufferUtils.metaToBuffer(meta.value),
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promise: () => resolvePromise({ then: metaToValue(meta.then) }),
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error: () => metaToPlainObject(meta),
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date: () => new Date(meta.value),
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exception: () => { throw errorUtils.deserialize(meta.value) }
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}
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if (meta.type in types) {
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return types[meta.type]()
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} else {
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let ret
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if (remoteObjectCache.has(meta.id)) {
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return remoteObjectCache.get(meta.id)
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}
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// A shadow class to represent the remote function object.
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if (meta.type === 'function') {
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const remoteFunction = function (...args) {
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let command
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if (this && this.constructor === remoteFunction) {
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command = 'ELECTRON_BROWSER_CONSTRUCTOR'
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} else {
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command = 'ELECTRON_BROWSER_FUNCTION_CALL'
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}
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const obj = ipcRenderer.sendSync(command, contextId, meta.id, wrapArgs(args))
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return metaToValue(obj)
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}
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ret = remoteFunction
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} else {
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ret = {}
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}
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setObjectMembers(ret, ret, meta.id, meta.members)
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setObjectPrototype(ret, ret, meta.id, meta.proto)
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Object.defineProperty(ret.constructor, 'name', { value: meta.name })
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// Track delegate obj's lifetime & tell browser to clean up when object is GCed.
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v8Util.setRemoteObjectFreer(ret, contextId, meta.id)
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v8Util.setHiddenValue(ret, 'atomId', meta.id)
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remoteObjectCache.set(meta.id, ret)
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return ret
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}
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}
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// Construct a plain object from the meta.
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function metaToPlainObject (meta) {
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const obj = (() => meta.type === 'error' ? new Error() : {})()
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for (let i = 0; i < meta.members.length; i++) {
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const { name, value } = meta.members[i]
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obj[name] = value
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}
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return obj
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}
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function handleMessage (channel, handler) {
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ipcRenderer.on(channel, (event, passedContextId, id, ...args) => {
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if (passedContextId === contextId) {
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handler(id, ...args)
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} else {
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// Message sent to an un-exist context, notify the error to main process.
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ipcRenderer.send('ELECTRON_BROWSER_WRONG_CONTEXT_ERROR', contextId, passedContextId, id)
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}
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})
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}
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// Browser calls a callback in renderer.
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handleMessage('ELECTRON_RENDERER_CALLBACK', (id, args) => {
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callbacksRegistry.apply(id, metaToValue(args))
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})
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// A callback in browser is released.
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handleMessage('ELECTRON_RENDERER_RELEASE_CALLBACK', (id) => {
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callbacksRegistry.remove(id)
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})
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exports.require = (module) => {
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const command = 'ELECTRON_BROWSER_REQUIRE'
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const meta = ipcRenderer.sendSync(command, contextId, module)
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return metaToValue(meta)
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}
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// Alias to remote.require('electron').xxx.
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exports.getBuiltin = (module) => {
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const command = 'ELECTRON_BROWSER_GET_BUILTIN'
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const meta = ipcRenderer.sendSync(command, contextId, module)
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return metaToValue(meta)
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}
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exports.getCurrentWindow = () => {
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const command = 'ELECTRON_BROWSER_CURRENT_WINDOW'
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const meta = ipcRenderer.sendSync(command, contextId)
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return metaToValue(meta)
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}
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// Get current WebContents object.
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exports.getCurrentWebContents = () => {
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return metaToValue(ipcRenderer.sendSync('ELECTRON_BROWSER_CURRENT_WEB_CONTENTS', contextId))
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}
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// Get a global object in browser.
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exports.getGlobal = (name) => {
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const command = 'ELECTRON_BROWSER_GLOBAL'
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const meta = ipcRenderer.sendSync(command, contextId, name)
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return metaToValue(meta)
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}
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// Get the process object in browser.
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exports.__defineGetter__('process', () => exports.getGlobal('process'))
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// Create a function that will return the specified value when called in browser.
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exports.createFunctionWithReturnValue = (returnValue) => {
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const func = () => returnValue
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v8Util.setHiddenValue(func, 'returnValue', true)
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return func
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}
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// Get the guest WebContents from guestInstanceId.
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exports.getGuestWebContents = (guestInstanceId) => {
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const command = 'ELECTRON_BROWSER_GUEST_WEB_CONTENTS'
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const meta = ipcRenderer.sendSync(command, contextId, guestInstanceId)
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return metaToValue(meta)
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}
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const addBuiltinProperty = (name) => {
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Object.defineProperty(exports, name, {
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get: () => exports.getBuiltin(name)
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})
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}
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const browserModules =
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require('@electron/internal/common/api/module-list').concat(
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require('@electron/internal/browser/api/module-list'))
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// And add a helper receiver for each one.
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browserModules
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.filter((m) => !m.private)
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.map((m) => m.name)
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.forEach(addBuiltinProperty)
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