Pxls is a collaborative canvas where users can place one pixel from a limited palette at a time, inspired by Reddit's r/Place experiment.

This repository holds the back end server. The front end can be found here.

Note: A Docker image is available at aneurinprice/docker-pxls.space and on Docker Hub.

Installation

Automatically built pxls*.jar files are available as artifacts on each push here.

Building

The following are required on the build system:

• JDK 16
• Apache Maven

The following are required on the target system:

• JRE 16
• Postgres

To build, run mvn clean package in the project root.

The built pxls*.jar file is available in target/.

Running

Copy the built pxls*.jar along with the following (renamed) to the instance directory:

• reference.conf (pxls.conf)
• roles-reference.conf (roles.conf)
• palette-reference.conf (palette.conf)

Edit configuration files as necessary. The following pxls.conf keys MUST be configured from default for an instance to run:

• database.user
• database.pass
• database.url
• host
• oauth (necessary for any form of user authentication)
  • Reddit, Google, Discord, VK, and Tumblr are current supported.

Run with java -jar pxls*.jar

Notes

• The server will start on port 4567 by default.
• The instance has a rudimentary console.
• The configuration file uses HOCON.
• Unspecified configuration values will use built-in defaults from resources/reference.conf.
• Automatic backups of board.dat are saved every five minutes to backups/ in the configured storage directory, as well as before exiting (with CTRL + C).
• The Symbols template style uses the reference palette configuration. See here to modify or remove.

Configuring CAPTCHA

CAPTCHAs are disabled by default and must be configured to work. A CAPTCHA key and secret is needed and the type must be "Invisible reCAPTCHA".

The host configuration key must be an approved domain on the reCAPTCHA admin panel. For local testing, this will likely be localhost (no port).

An example CAPTCHA section could look like this:

host: "example.com"

captcha {
  enabled: false
  // Captcha will show rougly 1/<threshold> times
  threshold: 5
  key: "6LcedG4UAAAAAKA6l9BbRPvZ2vt3lTrCQwz8rfPe"
  secret: "6LcedG4UAAAAAIXZcNFhnLKvTQwG1E8BzQQt_-MR"
  maxPixels: 0
  allTime: true
}

Console Commands

Commands can be entered into the running instance through standard input.

exact |exact| (required description) [optional description] one-or-more... DEFAULT/possible/values {description}

General

Command	Arguments	Description
reload		Reloads pxls.conf and roles.conf, applying most changes immediately. Also reloads the user and faction cache.
save		Saves the board.
alert	[message]	Alerts every user with the given message (or blank if left empty).
cons	[|authed|]	Lists the total (or authenticated) connection count.
users		Lists all authenticated usernames.
broadcast	(message)	Sends the message in chat.
cf	(query)	Runs the query through the chat filter.
reloadusers		Reloads the user manager. Laggy!
idlecheck		Runs the user timeout check.
senduserdata		Broadcasts the non-idle user count in chat.
addnotification	(title) (expiry) (body)	Adds a new notification to the notification panel with the body. +123 for the expiry means 123 seconds from now.
bp	(packet)	Broadcasts a raw JSON packet to all connections.
up	(username) (packet)	Broadcasts a raw JSON packet to all active connections from the user.
f	(faction ID) [delete/tag [new tag]/name [new name]]	Prints information about the faction or changes the tag or name.

Canvas Management

Command	Arguments	Description
nuke	(x1) (y1) (x2) (y2) (color)	Replaces all pixels from (x1, y1) to (x2, y2) with the specified color index.
replace	(x1) (y1) (x2) (y2) (from color) (to color)	Replaces all pixels from (x1, y1) to (x2, y2) matching the from color index with the to color index.

User Management

Command	Arguments	Description
logins	(username) [{service ID}:{service user ID} ...]	Gets or sets the user's login method(s).
addlogins	(username) ({service ID}:{service user ID} ...)	Adds login method(s) to the user.
removelogins	(username) ({service ID}:{service user ID} ...)	Removes login method(s) from the user.
roles	(username) [role ID ...]	Gets or sets the user's roles.
addroles	(username) (role ID ...)	Adds role(s) to the user.
removeroles	(username) (role ID ...)	Removes role(s) from the user.
ban	(username) [reason]	Bans the user for 24 hours with the given reason.
permaban	(username) [reason]	Permanently bans the user with the given reason.
shadowban	(username) [reason]	Shadowbans the user (making new pixels local) with the given reason.
unban	(username) [{revert} TRUE/false] [reason]	Unbans the user, reverting their pixels and with the given reason.
stack	(user) [|set| (amount)]	Gets or sets the user's stacked pixels. User must not be on cooldown before setting.
placementOverride	|list|/(user) [placeAnyColor/ignoreCooldown/ignorePlacemap] [on/off]	Lists all placement overrides or turns a placement override on/off for the user.
captchaOverride	|list|/(user) [on/off]	Lists all captcha overrides or turns it on/off for the user.
chatban	(username) (length) ({purge} true/false) (reason)	Bans the user from chat for the length in seconds, optionally purging all of their messages, with the given reason.
permachatban	(username) ({purge} true/false) (reason)	Permanently bans the user from chat optionally purging all of their messages, with the given reason.
unchatban	(username)	Unbans the user from chat.
chatpurge	(username) [amount] [reason]	Purges up to amount chat messages from the user for the given reason.
flagrename	(username) [{flag} TRUE/false]	Flags or unflags the user for rename.
setname|updateusername	(username) (new username)	Renames the user.

Licenses

• This project includes icons from Font Awesome Free 5.9.0 by fontawesome - https://fontawesome.com
  • License: https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License)