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WBO

WBO is an online collaborative whiteboard that allows many users to draw simultaneously on a large virtual board. The board is updated in real time for all connected users, and its state is always persisted. It can be used for many different purposes, including art, entertainment, design, teaching.

A demonstration server is available at wbo.ophir.dev

Screenshots

The anonymous board collaborative diagram editing Screenshot of WBO's user interface: architecture
teaching math on WBO wbo teaching drawing art kawai cats on WBO

Running your own instance of WBO

If you have your own web server, and want to run a private instance of WBO on it, you can. It should be very easy to get it running on your own server.

Running the code in a container (safer)

If you use the docker containerization service, you can easily run WBO as a container. An official docker image for WBO is hosted on dockerhub as lovasoa/wbo: WBO 1M docker pulls.

You can run the following bash command to launch WBO on port 5001, while persisting the boards outside of docker:

mkdir wbo-boards # Create a directory that will contain your whiteboards
chown -R 1000:1000 wbo-boards # Make this directory accessible to WBO
docker run -it --publish 5001:80 --volume "$(pwd)/wbo-boards:/opt/app/server-data" lovasoa/wbo:latest # run wbo

You can then access WBO at http://localhost:5001.

Running the code without a container

Alternatively, you can run the code with node.js directly, without docker.

First, download the sources:

git clone https://github.com/lovasoa/whitebophir.git
cd whitebophir

Then install node.js (v10.0 or superior) if you don't have it already, then install WBO's dependencies:

npm install --production

Finally, you can start the server:

PORT=5001 npm start

This will run WBO directly on your machine, on port 5001, without any isolation from the other services. You can also use an invokation like

PORT=5001 HOST=127.0.0.1 npm start

to make whitebophir only listen on the loopback device. This is useful if you want to put whitebophir behind a reverse proxy.

Running WBO on a subfolder

By default, WBO launches its own web server and serves all of its content at the root of the server (on /). If you want to make the server accessible with a different path like https://your.domain.com/wbo/ you have to setup a reverse proxy. See instructions on our Wiki about how to setup a reverse proxy for WBO.

Translations

WBO is available in multiple languages. The translations are stored in server/translations.json. If you feel like contributing to this collaborative project, you can translate WBO into your own language.

Authentication

WBO supports authentication using Json Web Tokens. This should be passed in as a query with the key token, eg, http://myboard.com/boards/test?token={token}

The AUTH_SECRET_KEY variable in configuration.js should be filled with the secret key for the JWT.

Within the payload, you can declare the user's roles as an array. Currently the only accepted roles are moderator and editor.

  • moderator will give the user an additional tool to wipe all data from the board. To declare this role, see the example below.
  • editor will give the user the ability to edit the board. This is the default role for all users.
{
  "iat": 1516239022,
  "exp": 1516298489,
  "roles": ["moderator"]
}

Moderators have access to the Clear tool, which will wipe all content from the board.

Board name verification in the JWT

WBO supports verification of the board with a JWT.

To check for a valid board name just add the board name to the role with a ":". With this you can set a moderator for a specific board.

{
  "roles": [
    "moderator:<boardName1>",
    "moderator:<boardName2>",
    "editor:<boardName3>",
    "editor:<boardName4>"
  ]
}

eg, http://myboard.com/boards/mySecretBoardName?token={token}

{
  "iat": 1516239022,
  "exp": 1516298489,
  "roles": ["moderator:mySecretBoardName"]
}

You can now be sure that only users who have the correct token have access to the board with the specific name.

Configuration

When you start a WBO server, it loads its configuration from several environment variables. You can see a list of these variables in configuration.js. Some important environment variables are :

  • WBO_HISTORY_DIR : configures the directory where the boards are saved. Defaults to ./server-data/.
  • WBO_MAX_EMIT_COUNT : the maximum number of messages that a client can send per unit of time. Increase this value if you want smoother drawings, at the expense of being susceptible to denial of service attacks if your server does not have enough processing power. By default, the units of this quantity are messages per 4 seconds, and the default value is 192.
  • AUTH_SECRET_KEY : If you would like to authenticate your boards using jwt, this declares the secret key.

Troubleshooting

If you experience an issue or want to propose a new feature in WBO, please open a github issue.

Monitoring

If you are self-hosting a WBO instance, you may want to monitor its load, the number of connected users, and various other metrics.

You can start WBO with the STATSD_URL environment variable to send it to a statsd-compatible metrics collection agent.

Example: docker run -e STATSD_URL=udp://127.0.0.1:8125 lovasoa/wbo.

  • If you use prometheus, you can collect the metrics with statsd-exporter.
  • If you use datadog, you can collect the metrics with dogstatsd.

Download SVG preview

To download a preview of a board in SVG format you can got to /preview/{boardName}, e.g. change https://wbo.ophir.dev/board/anonymous to https://wbo.ophir.dev/preview/anonymous. The renderer is not 100% faithful, but it's often good enough.