Pxls is a collaborative image editor where you can only place one pixel every 3 minutes.

Pxls is a simple Java application, that can be run as follows:

git clone https://github.com/xSke/Pxls
cd Pxls
mvn clean package
java -jar target/pxls-1.0-SNAPSHOT.jar

The server will start on port 4567 by default, and will expose a rudimentary console with a few commands.

Pxls can be configured with a few environment variables:

CANVAS_WIDTH - the width of the canvas (default 1000)
CANVAS_HEIGHT - the height of the canvas (default 1000)
COOLDOWN - the cooldown to apply between pixel placements, in seconds (default 180)
PORT - the port to run the web server on (default 4567)
STORAGE - the directory to store map data, logs, and backups (default .)
CAPTCHA_KEY - the Invisible ReCaptcha secret key (default none, captcha disabled)
CAPTCHA_THRESHOLD - how often the captcha should appear (higher threshold = less captchas) BAN_TOR - whether to ban tor exit nodes, true/false (default true)

Pxls will automatically save a backup of the map every five minutes to $STORAGE/backups/board.<timestamp>.dat, as well as before executing a blank operation and right before exiting (via Ctrl-C).

Commands are entered directly into the running instance (stdin).

cooldown <secs> - changes the cooldown server-wide
alert <message> - broadcasts an alert message to all clients
blank <x1> <y1> <x2> <y2> - wipes out a section of the map to white, logging as <blank operation> and backing up beforehand
trusted - lists all trusted IPs (a trusted IP has no captcha or cooldown, does not persist through restarts)
trust <ip> - adds an IP to the trusted list
untrust <ip> - removes an IP from the trusted list
ban <ip> - bans an IP (does not persist through restarts) unban <ip> - unbans an IP
captcha_threshold <threshold> - changes the captcha threshold, see above
save - saves the map