Matrix-communication-helper NPM

Matrix communication helper

Matrix communication helper is an NPM package that provides end-to-end encrypted (e2ee) secure communication between web services, built on top of the Matrix protocol. This package makes it easy to send and receive encrypted messages, create and manage rooms, and invite users to rooms.

Requirements

Node.js version 18 or higher.
A valid account on the desired homeserver, where are NOT back up keys set up.

Installation

To install the package, run the following command:

npm install matrix-communication-helper

Web app - specific prerequisites

In WebApp, after install package, you need to move olm.wasm file from node_modules/@matrix-org/olm and put it in public folder and in web app you need to declare variable global before using this package.

<script> var global = window; </script>

Exported methods

runClient(credentials) Initializes and starts the Matrix client with the given credentials.
createRoom(roomName) Creates a new private, end-to-end encrypted room.
inviteUser(roomId, userId) Invites a user to a room.
sendEncryptedMessage(roomId, message) Sends an encrypted message to a room.
sendMessage(roomId, message) Sends a plain text message to a room.
onMessage(roomId, onMessageCallback) Sets up a message listener for plain text messages in a room.
onEncryptedMessage(roomId, onMessageCallback) Sets up a message listener for encrypted messages in a room.
getJoinedRoomsID() Retrieves an array of room IDs that the client has joined.
getAllMemberUserIds(roomId) Retrieves an array of room member's user ids.
getMyPowerLevel(roomId) Retrieves the power level of the client in a room.
isCurrentClientJoinedInRoom(roomId) Checks if the client is a member of a room.

Usage

Import the package:

import m_helper from "matrix-communication-helper";

Provide the user's login credentials (homeserver URL, username and password as object):

const credentials = {
    homeserverUrl: "https://matrix.org",
    username: "your-username",
    password: "your-password",
};

or in Node app use json file like this conf.json and add relative path to this file as parameter, e.g. "./config.json"

{
    "homeserverUrl": "https://matrix.org",
    "username": "yourUsername",
    "password": "yourPassword"
}

Start the client with the provided credentials using object or file path to file with creds:

m_helper.runClient(credentials)
.then(() => {
    // Your code here
})
.catch((error) => {
    console.error("Error while running client:", error);
});

Use the available functions to perform various tasks, such as sending encrypted messages, listening for encrypted messages, inviting users to a room, and more. See the following examples:

const roomsID = await m_helper.getJoinedRoomsID();
const roomId = roomsID[0];

const mess = {
    albumId: 1,
    id: 2,
    title: "reprehenderit est deserunt velit ipsam",
    url: "https://via.placeholder.com/600/771796",
    thumbnailUrl: "https://via.placeholder.com/150/771796",
};

// Send an encrypted message
m_helper.sendEncryptedMessage(roomId, mess)
.then((response) => {
    console.log(response);
})
.catch((error) => {
    console.error("Error while sending encrypted message:", error);
});

// Listen for encrypted messages
m_helper.onEncryptedMessage( roomId, (message) => {
        console.log("Received message:", message);
    }
);