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metamask-extension/app/scripts/detect-multiple-instances.js

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/**
* Sets up two-way communication between the
* mainline version of extension and Flask build
* in order to detect & warn if there are two different
* versions running simultaneously.
*/
import browser from 'webextension-polyfill';
import {
PLATFORM_CHROME,
PLATFORM_FIREFOX,
CHROME_BUILD_IDS,
FIREFOX_BUILD_IDS,
} from '../../shared/constants/app';
import { getPlatform } from './lib/util';
const MESSAGE_TEXT = 'isRunning';
const showWarning = () =>
console.warn('Warning! You have multiple instances of MetaMask running!');
/**
* Handles the ping message sent from other extension.
* Displays console warning if it's active.
*
* @param message - The message received from the other extension
*/
export const onMessageReceived = (message) => {
if (message === MESSAGE_TEXT) {
showWarning();
}
};
/**
* Sends the ping message sent to other extensions to detect whether it's active or not.
*/
export const checkForMultipleVersionsRunning = async () => {
if (getPlatform() !== PLATFORM_CHROME && getPlatform() !== PLATFORM_FIREFOX) {
return;
}
const buildIds =
getPlatform() === PLATFORM_CHROME ? CHROME_BUILD_IDS : FIREFOX_BUILD_IDS;
const thisBuild = browser.runtime.id;
for (const id of buildIds) {
if (id !== thisBuild) {
try {
await browser.runtime.sendMessage(id, MESSAGE_TEXT);
} catch (error) {
// Should do nothing if receiving end was not reached (no other instances running)
}
}
}
};