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341 lines
11 KiB
341 lines
11 KiB
import EventEmitter from 'events';
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import { ObservableStore } from '@metamask/obs-store';
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import { bufferToHex, stripHexPrefix } from 'ethereumjs-util';
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import { ethErrors } from 'eth-rpc-errors';
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import log from 'loglevel';
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import { MESSAGE_TYPE } from '../../../shared/constants/app';
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import { METAMASK_CONTROLLER_EVENTS } from '../metamask-controller';
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import createId from '../../../shared/modules/random-id';
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import { addHexPrefix } from './util';
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const hexRe = /^[0-9A-Fa-f]+$/gu;
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/**
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* Represents, and contains data about, an 'eth_decrypt' type decryption request. These are created when a
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* decryption for an eth_decrypt call is requested.
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*
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* @typedef {Object} DecryptMessage
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* @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 decryptMessage method once the decryption request is
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* approved.
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* @property {Object} msgParams.metamaskId Added to msgParams for tracking and identification within MetaMask.
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* @property {string} msgParams.data A hex string conversion of the raw buffer data of the decryption request
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* @property {number} time The epoch time at which the this message was created
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* @property {string} status Indicates whether the decryption request is 'unapproved', 'approved', 'decrypted' or 'rejected'
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* @property {string} type The json-prc decryption method for which a decryption request has been made. A 'Message' will
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* always have a 'eth_decrypt' type.
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*/
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export default class DecryptMessageManager extends EventEmitter {
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/**
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* Controller in charge of managing - storing, adding, removing, updating - DecryptMessage.
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*
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* @param {object} opts - Controller options
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* @param {Function} opts.metricEvent - A function for emitting a metric event.
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*/
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constructor(opts) {
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super();
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this.memStore = new ObservableStore({
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unapprovedDecryptMsgs: {},
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unapprovedDecryptMsgCount: 0,
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});
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this.messages = [];
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this.metricsEvent = opts.metricsEvent;
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}
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/**
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* A getter for the number of 'unapproved' DecryptMessages in this.messages
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*
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* @returns {number} The number of 'unapproved' DecryptMessages in this.messages
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*/
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get unapprovedDecryptMsgCount() {
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return Object.keys(this.getUnapprovedMsgs()).length;
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}
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/**
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* A getter for the 'unapproved' DecryptMessages in this.messages
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*
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* @returns {Object} An index of DecryptMessage ids to DecryptMessages, for all 'unapproved' DecryptMessages in
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* this.messages
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*/
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getUnapprovedMsgs() {
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return this.messages
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.filter((msg) => msg.status === 'unapproved')
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.reduce((result, msg) => {
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result[msg.id] = msg;
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return result;
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}, {});
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}
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/**
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* Creates a new DecryptMessage with an 'unapproved' status using the passed msgParams. this.addMsg is called to add
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* the new DecryptMessage to this.messages, and to save the unapproved DecryptMessages from that list to
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* this.memStore.
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*
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* @param {Object} msgParams - The params for the eth_decrypt call to be made after the message is approved.
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* @param {Object} [req] - The original request object possibly containing the origin
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* @returns {Promise<Buffer>} The raw decrypted message contents
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*/
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addUnapprovedMessageAsync(msgParams, req) {
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return new Promise((resolve, reject) => {
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if (!msgParams.from) {
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reject(new Error('MetaMask Decryption: from field is required.'));
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return;
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}
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const msgId = this.addUnapprovedMessage(msgParams, req);
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this.once(`${msgId}:finished`, (data) => {
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switch (data.status) {
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case 'decrypted':
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resolve(data.rawData);
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return;
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case 'rejected':
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reject(
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ethErrors.provider.userRejectedRequest(
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'MetaMask Decryption: User denied message decryption.',
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),
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);
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return;
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case 'errored':
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reject(new Error('This message cannot be decrypted'));
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return;
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default:
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reject(
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new Error(
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`MetaMask Decryption: Unknown problem: ${JSON.stringify(
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msgParams,
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)}`,
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),
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);
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}
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});
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});
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}
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/**
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* Creates a new DecryptMessage with an 'unapproved' status using the passed msgParams. this.addMsg is called to add
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* the new DecryptMessage to this.messages, and to save the unapproved DecryptMessages from that list to
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* this.memStore.
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*
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* @param {Object} msgParams - The params for the eth_decryptMsg call to be made after the message is approved.
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* @param {Object} [req] - The original request object possibly containing the origin
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* @returns {number} The id of the newly created DecryptMessage.
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*/
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addUnapprovedMessage(msgParams, req) {
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log.debug(
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`DecryptMessageManager addUnapprovedMessage: ${JSON.stringify(
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msgParams,
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)}`,
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);
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// add origin from request
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if (req) {
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msgParams.origin = req.origin;
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}
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msgParams.data = this.normalizeMsgData(msgParams.data);
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// create txData obj with parameters and meta data
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const time = new Date().getTime();
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const msgId = createId();
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const msgData = {
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id: msgId,
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msgParams,
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time,
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status: 'unapproved',
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type: MESSAGE_TYPE.ETH_DECRYPT,
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};
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this.addMsg(msgData);
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// signal update
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this.emit('update');
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return msgId;
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}
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/**
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* Adds a passed DecryptMessage to this.messages, and calls this._saveMsgList() to save the unapproved DecryptMessages from that
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* list to this.memStore.
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*
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* @param {Message} msg - The DecryptMessage to add to this.messages
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*/
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addMsg(msg) {
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this.messages.push(msg);
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this._saveMsgList();
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}
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/**
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* Returns a specified DecryptMessage.
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*
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* @param {number} msgId - The id of the DecryptMessage to get
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* @returns {DecryptMessage|undefined} The DecryptMessage with the id that matches the passed msgId, or undefined
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* if no DecryptMessage has that id.
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*/
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getMsg(msgId) {
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return this.messages.find((msg) => msg.id === msgId);
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}
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/**
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* Approves a DecryptMessage. Sets the message status via a call to this.setMsgStatusApproved, and returns a promise
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* with the message params modified for proper decryption.
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*
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* @param {Object} msgParams - The msgParams to be used when eth_decryptMsg is called, plus data added by MetaMask.
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* @param {Object} msgParams.metamaskId - Added to msgParams for tracking and identification within MetaMask.
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* @returns {Promise<object>} Promises the msgParams object with metamaskId removed.
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*/
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approveMessage(msgParams) {
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this.setMsgStatusApproved(msgParams.metamaskId);
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return this.prepMsgForDecryption(msgParams);
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}
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/**
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* Sets a DecryptMessage status to 'approved' via a call to this._setMsgStatus.
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*
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* @param {number} msgId - The id of the DecryptMessage to approve.
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*/
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setMsgStatusApproved(msgId) {
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this._setMsgStatus(msgId, 'approved');
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}
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/**
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* Sets a DecryptMessage status to 'decrypted' via a call to this._setMsgStatus and updates that DecryptMessage in
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* this.messages by adding the raw decryption data of the decryption request to the DecryptMessage
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*
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* @param {number} msgId - The id of the DecryptMessage to decrypt.
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* @param {buffer} rawData - The raw data of the message request
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*/
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setMsgStatusDecrypted(msgId, rawData) {
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const msg = this.getMsg(msgId);
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msg.rawData = rawData;
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this._updateMsg(msg);
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this._setMsgStatus(msgId, 'decrypted');
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}
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/**
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* Removes the metamaskId property from passed msgParams and returns a promise which resolves the updated msgParams
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*
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* @param {Object} msgParams - The msgParams to modify
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* @returns {Promise<object>} Promises the msgParams with the metamaskId property removed
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*/
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prepMsgForDecryption(msgParams) {
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delete msgParams.metamaskId;
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return Promise.resolve(msgParams);
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}
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/**
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* Sets a DecryptMessage status to 'rejected' via a call to this._setMsgStatus.
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*
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* @param {number} msgId - The id of the DecryptMessage to reject.
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* @param reason
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*/
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rejectMsg(msgId, reason = undefined) {
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if (reason) {
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this.metricsEvent({
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event: reason,
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category: 'Messages',
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properties: {
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action: 'Decrypt Message Request',
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},
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});
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}
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this._setMsgStatus(msgId, 'rejected');
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}
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/**
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* Sets a TypedMessage status to 'errored' via a call to this._setMsgStatus.
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*
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* @param {number} msgId - The id of the TypedMessage to error
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* @param error
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*/
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errorMessage(msgId, error) {
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const msg = this.getMsg(msgId);
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msg.error = error;
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this._updateMsg(msg);
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this._setMsgStatus(msgId, 'errored');
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}
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/**
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* Clears all unapproved messages from memory.
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*/
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clearUnapproved() {
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this.messages = this.messages.filter((msg) => msg.status !== 'unapproved');
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this._saveMsgList();
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}
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/**
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* Updates the status of a DecryptMessage in this.messages via a call to this._updateMsg
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*
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* @private
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* @param {number} msgId - The id of the DecryptMessage to update.
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* @param {string} status - The new status of the DecryptMessage.
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* @throws A 'DecryptMessageManager - DecryptMessage not found for id: "${msgId}".' if there is no DecryptMessage
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* in this.messages with an id equal to the passed msgId
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* @fires An event with a name equal to `${msgId}:${status}`. The DecryptMessage is also fired.
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* @fires If status is 'rejected' or 'decrypted', an event with a name equal to `${msgId}:finished` is fired along
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* with the DecryptMessage
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*/
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_setMsgStatus(msgId, status) {
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const msg = this.getMsg(msgId);
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if (!msg) {
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throw new Error(
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`DecryptMessageManager - Message not found for id: "${msgId}".`,
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);
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}
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msg.status = status;
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this._updateMsg(msg);
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this.emit(`${msgId}:${status}`, msg);
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if (
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status === 'rejected' ||
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status === 'decrypted' ||
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status === 'errored'
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) {
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this.emit(`${msgId}:finished`, msg);
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}
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}
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/**
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* Sets a DecryptMessage in this.messages to the passed DecryptMessage if the ids are equal. Then saves the
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* unapprovedDecryptMsgs index to storage via this._saveMsgList
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*
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* @private
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* @param {DecryptMessage} msg - A DecryptMessage that will replace an existing DecryptMessage (with the same
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* id) in this.messages
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*/
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_updateMsg(msg) {
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const index = this.messages.findIndex((message) => message.id === msg.id);
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if (index !== -1) {
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this.messages[index] = msg;
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}
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this._saveMsgList();
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}
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/**
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* Saves the unapproved DecryptMessages, and their count, to this.memStore
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*
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* @private
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* @fires 'updateBadge'
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*/
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_saveMsgList() {
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const unapprovedDecryptMsgs = this.getUnapprovedMsgs();
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const unapprovedDecryptMsgCount = Object.keys(unapprovedDecryptMsgs).length;
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this.memStore.updateState({
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unapprovedDecryptMsgs,
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unapprovedDecryptMsgCount,
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});
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this.emit(METAMASK_CONTROLLER_EVENTS.UPDATE_BADGE);
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}
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/**
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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.
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*
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* @param {any} data - The buffer data to convert to a hex
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* @returns {string} A hex string conversion of the buffer data
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*/
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normalizeMsgData(data) {
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try {
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const stripped = stripHexPrefix(data);
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if (stripped.match(hexRe)) {
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return addHexPrefix(stripped);
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}
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} catch (e) {
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log.debug(`Message was not hex encoded, interpreting as utf8.`);
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}
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return bufferToHex(Buffer.from(data, 'utf8'));
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}
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}
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