A Metamask fork with Infura removed and default networks editable
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
ciphermask/app/scripts/lib/message-manager.js

294 lines
9.8 KiB

import EventEmitter from 'events'
import { ObservableStore } from '@metamask/obs-store'
import ethUtil from 'ethereumjs-util'
import { ethErrors } from 'eth-json-rpc-errors'
import { MESSAGE_TYPE } from '../../../shared/constants/app'
import createId from './random-id'
/**
* Represents, and contains data about, an 'eth_sign' type signature request. These are created when a signature for
* an eth_sign call is requested.
*
* @see {@link https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign}
*
* @typedef {Object} Message
* @property {number} id An id to track and identify the message object
7 years ago
* @property {Object} msgParams The parameters to pass to the eth_sign method once the signature request is approved.
* @property {Object} msgParams.metamaskId Added to msgParams for tracking and identification within MetaMask.
* @property {string} msgParams.data A hex string conversion of the raw buffer data of the signature request
* @property {number} time The epoch time at which the this message was created
* @property {string} status Indicates whether the signature request is 'unapproved', 'approved', 'signed' or 'rejected'
* @property {string} type The json-prc signing method for which a signature request has been made. A 'Message' with
* always have a 'eth_sign' type.
*
*/
export default class MessageManager extends EventEmitter {
/**
* Controller in charge of managing - storing, adding, removing, updating - Messages.
*
* @typedef {Object} MessageManager
7 years ago
* @property {Object} memStore The observable store where Messages are saved.
* @property {Object} memStore.unapprovedMsgs A collection of all Messages in the 'unapproved' state
* @property {number} memStore.unapprovedMsgCount The count of all Messages in this.memStore.unapprovedMsgs
* @property {Array} messages Holds all messages that have been created by this MessageManager
*
*/
constructor() {
super()
this.memStore = new ObservableStore({
unapprovedMsgs: {},
unapprovedMsgCount: 0,
})
this.messages = []
}
/**
* A getter for the number of 'unapproved' Messages in this.messages
*
* @returns {number} The number of 'unapproved' Messages in this.messages
*
*/
get unapprovedMsgCount() {
return Object.keys(this.getUnapprovedMsgs()).length
}
/**
* A getter for the 'unapproved' Messages in this.messages
*
* @returns {Object} An index of Message ids to Messages, for all 'unapproved' Messages in this.messages
*
*/
getUnapprovedMsgs() {
return this.messages
.filter((msg) => msg.status === 'unapproved')
.reduce((result, msg) => {
result[msg.id] = msg
return result
}, {})
}
/**
* Creates a new Message with an 'unapproved' status using the passed msgParams. this.addMsg is called to add the
* new Message to this.messages, and to save the unapproved Messages from that list to this.memStore.
*
* @param {Object} msgParams - The params for the eth_sign call to be made after the message is approved.
* @param {Object} [req] - The original request object possibly containing the origin
* @returns {promise} after signature has been
*
*/
addUnapprovedMessageAsync(msgParams, req) {
return new Promise((resolve, reject) => {
const msgId = this.addUnapprovedMessage(msgParams, req)
// await finished
this.once(`${msgId}:finished`, (data) => {
switch (data.status) {
case 'signed':
return resolve(data.rawSig)
case 'rejected':
return reject(
ethErrors.provider.userRejectedRequest(
'MetaMask Message Signature: User denied message signature.',
),
)
default:
return reject(
new Error(
`MetaMask Message Signature: Unknown problem: ${JSON.stringify(
msgParams,
)}`,
),
)
}
})
})
}
/**
* Creates a new Message with an 'unapproved' status using the passed msgParams. this.addMsg is called to add the
* new Message to this.messages, and to save the unapproved Messages from that list to this.memStore.
*
* @param {Object} msgParams - The params for the eth_sign call to be made after the message is approved.
* @param {Object} [req] - The original request object where the origin may be specified
* @returns {number} The id of the newly created message.
*
*/
addUnapprovedMessage(msgParams, req) {
// add origin from request
if (req) {
msgParams.origin = req.origin
}
msgParams.data = normalizeMsgData(msgParams.data)
// create txData obj with parameters and meta data
const time = new Date().getTime()
const msgId = createId()
const msgData = {
id: msgId,
msgParams,
time,
status: 'unapproved',
type: MESSAGE_TYPE.ETH_SIGN,
}
this.addMsg(msgData)
// signal update
this.emit('update')
return msgId
}
/**
* Adds a passed Message to this.messages, and calls this._saveMsgList() to save the unapproved Messages from that
* list to this.memStore.
*
* @param {Message} msg - The Message to add to this.messages
*
*/
addMsg(msg) {
this.messages.push(msg)
this._saveMsgList()
}
/**
* Returns a specified Message.
*
* @param {number} msgId - The id of the Message to get
* @returns {Message|undefined} The Message with the id that matches the passed msgId, or undefined if no Message has that id.
*
*/
getMsg(msgId) {
return this.messages.find((msg) => msg.id === msgId)
}
/**
* Approves a Message. Sets the message status via a call to this.setMsgStatusApproved, and returns a promise with
* any the message params modified for proper signing.
*
* @param {Object} msgParams - The msgParams to be used when eth_sign is called, plus data added by MetaMask.
7 years ago
* @param {Object} msgParams.metamaskId Added to msgParams for tracking and identification within MetaMask.
* @returns {Promise<object>} Promises the msgParams object with metamaskId removed.
*
*/
approveMessage(msgParams) {
this.setMsgStatusApproved(msgParams.metamaskId)
return this.prepMsgForSigning(msgParams)
}
/**
* Sets a Message status to 'approved' via a call to this._setMsgStatus.
*
* @param {number} msgId - The id of the Message to approve.
*
*/
setMsgStatusApproved(msgId) {
this._setMsgStatus(msgId, 'approved')
}
/**
* Sets a Message status to 'signed' via a call to this._setMsgStatus and updates that Message in this.messages by
* adding the raw signature data of the signature request to the Message
*
* @param {number} msgId - The id of the Message to sign.
* @param {buffer} rawSig - The raw data of the signature request
*
*/
setMsgStatusSigned(msgId, rawSig) {
const msg = this.getMsg(msgId)
msg.rawSig = rawSig
this._updateMsg(msg)
this._setMsgStatus(msgId, 'signed')
}
/**
* Removes the metamaskId property from passed msgParams and returns a promise which resolves the updated msgParams
*
* @param {Object} msgParams - The msgParams to modify
* @returns {Promise<object>} Promises the msgParams with the metamaskId property removed
*
*/
prepMsgForSigning(msgParams) {
delete msgParams.metamaskId
return Promise.resolve(msgParams)
}
/**
* Sets a Message status to 'rejected' via a call to this._setMsgStatus.
*
* @param {number} msgId - The id of the Message to reject.
*
*/
rejectMsg(msgId) {
this._setMsgStatus(msgId, 'rejected')
}
/**
* Updates the status of a Message in this.messages via a call to this._updateMsg
*
* @private
* @param {number} msgId - The id of the Message to update.
* @param {string} status - The new status of the Message.
* @throws A 'MessageManager - Message not found for id: "${msgId}".' if there is no Message in this.messages with an
* id equal to the passed msgId
* @fires An event with a name equal to `${msgId}:${status}`. The Message is also fired.
* @fires If status is 'rejected' or 'signed', an event with a name equal to `${msgId}:finished` is fired along with the message
*
*/
_setMsgStatus(msgId, status) {
const msg = this.getMsg(msgId)
if (!msg) {
throw new Error(`MessageManager - Message not found for id: "${msgId}".`)
}
msg.status = status
this._updateMsg(msg)
this.emit(`${msgId}:${status}`, msg)
if (status === 'rejected' || status === 'signed') {
this.emit(`${msgId}:finished`, msg)
}
}
/**
* Sets a Message in this.messages to the passed Message if the ids are equal. Then saves the unapprovedMsg list to
* storage via this._saveMsgList
*
* @private
* @param {msg} Message - A Message that will replace an existing Message (with the same id) in this.messages
*
*/
_updateMsg(msg) {
const index = this.messages.findIndex((message) => message.id === msg.id)
if (index !== -1) {
this.messages[index] = msg
}
this._saveMsgList()
}
/**
* Saves the unapproved messages, and their count, to this.memStore
*
* @private
* @fires 'updateBadge'
*
*/
_saveMsgList() {
const unapprovedMsgs = this.getUnapprovedMsgs()
const unapprovedMsgCount = Object.keys(unapprovedMsgs).length
this.memStore.updateState({ unapprovedMsgs, unapprovedMsgCount })
this.emit('updateBadge')
}
}
/**
* A helper function that converts raw buffer data to a hex, or just returns the data if it is already formatted as a hex.
*
* @param {any} data - The buffer data to convert to a hex
* @returns {string} A hex string conversion of the buffer data
*
*/
function normalizeMsgData(data) {
if (data.slice(0, 2) === '0x') {
// data is already hex
return data
}
// data is unicode, convert to hex
return ethUtil.bufferToHex(Buffer.from(data, 'utf8'))
}