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metamask-extension/app/scripts/lib/message-manager.js

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import EventEmitter from 'events';
import { ObservableStore } from '@metamask/obs-store';
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import { bufferToHex } from 'ethereumjs-util';
import { ethErrors } from 'eth-rpc-errors';
import { MESSAGE_TYPE } from '../../../shared/constants/app';
import { METAMASK_CONTROLLER_EVENTS } from '../metamask-controller';
import createId from '../../../shared/modules/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
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* @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
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* @property {Object} memStore The observable store where Messages are saved.
* @property {Object} memStore.unapprovedMsgs A collection of all Messages in the 'unapproved' state
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* @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
*
*/
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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
*
*/
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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
*
*/
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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
*
*/
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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':
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return reject(
ethErrors.provider.userRejectedRequest(
'MetaMask Message Signature: User denied message signature.',
),
);
default:
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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.
*
*/
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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
*
*/
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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.
*
*/
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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.
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* @param {Object} msgParams.metamaskId Added to msgParams for tracking and identification within MetaMask.
* @returns {Promise<object>} Promises the msgParams object with metamaskId removed.
*
*/
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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.
*
*/
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setMsgStatusApproved(msgId) {
this._setMsgStatus(msgId, 'approved');
}
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/**
* 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
*
*/
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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
*
*/
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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.
*
*/
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rejectMsg(msgId) {
this._setMsgStatus(msgId, 'rejected');
}
/**
* Clears all unapproved messages from memory.
*/
clearUnapproved() {
this.messages = this.messages.filter((msg) => msg.status !== 'unapproved');
this._saveMsgList();
}
/**
* 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 `${msgId}:finished` is fired along with the message
*
*/
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_setMsgStatus(msgId, status) {
const msg = this.getMsg(msgId);
if (!msg) {
throw new Error(`MessageManager - Message not found for id: "${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
*
*/
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_updateMsg(msg) {
const index = this.messages.findIndex((message) => message.id === msg.id);
if (index !== -1) {
this.messages[index] = msg;
}
this._saveMsgList();
}
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/**
* Saves the unapproved messages, and their count, to this.memStore
*
* @private
* @fires 'updateBadge'
*
*/
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_saveMsgList() {
const unapprovedMsgs = this.getUnapprovedMsgs();
const unapprovedMsgCount = Object.keys(unapprovedMsgs).length;
this.memStore.updateState({ unapprovedMsgs, unapprovedMsgCount });
this.emit(METAMASK_CONTROLLER_EVENTS.UPDATE_BADGE);
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}
}
/**
* 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
*
*/
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function normalizeMsgData(data) {
if (data.slice(0, 2) === '0x') {
// data is already hex
return data;
}
// data is unicode, convert to hex
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return bufferToHex(Buffer.from(data, 'utf8'));
}