Discord-bot

Usage

From binary

discord-bot binaries are available on releases page.

From Dockerfile

Registry	Image
Docker Hub	blueprintue/discord-bot
GitHub Container Registry	ghcr.io/blueprintue/discord-bot

Build from source

git clone https://github.com/blueprintue/discord-bot.git discord-bot
cd discord-bot

# build docker image and output to docker with discord-bot tag (default)
docker buildx bake

# build multi-platform image
docker buildx bake image-all

# create artifacts in ./dist
docker buildx bake artifact-all

Run docker image inside project

If you git clone you will see a docker-composer.yml already setup for local image.
You need to create config.json in project folder.
By default log folder is /var/log/discord-bot so you need to set:

    "log": {
      "filename": "/var/log/discord-bot/discord-bot.log",
      "level": "info"
    },

Then you can run image.

docker-compose up --build -d

If you want to use image from repository replace image in docker-composer.yml.

Configuration explanations

General

Mandatory parameters to run discord-bot without modules.

Discord

JSON Parameter	ENV Parameter	Mandatory	Type	Description
name	DBOT_DISCORD_NAME	YES	string	discord server name (also called guild name)
token	DBOT_DISCORD_TOKEN	YES	string	token for a bot

How to get discord name?

When you are on a discord server, you will see a list of channels on the left, at the top you will see the discord server name.

How to generate token?

You need to create a bot, you can start by looking at tutorial from Discord: https://discord.com/developers/docs/getting-started.

Log

JSON Parameter	ENV Parameter	Mandatory	Type	Specific values	Default value	Description
filename	DBOT_LOG_FILENAME	YES	string			relative or absolute path to log file (it will create directories if not exist, for rotation you must use a directory with no other directories inside)
level	DBOT_LOG_LEVEL	NO	string	trace | debug | info | warn | error | fatal | panic	""	level of log (if empty then no log)
number_files_rotation	DBOT_LOG_NUMBER_FILES_ROTATION	NO	int		0	0 if no rotation at all - just reopen file on rotation. e.g. you would like use logrotate; >0 if rotation enabled

What is level?

It uses zerolog levels (from highest to lowest):

• panic (zerolog.PanicLevel, 5)
• fatal (zerolog.FatalLevel, 4)
• error (zerolog.ErrorLevel, 3)
• warn (zerolog.WarnLevel, 2)
• info (zerolog.InfoLevel, 1)
• debug (zerolog.DebugLevel, 0)
• trace (zerolog.TraceLevel, -1)

Modules

Healthchecks

Uses the Healthchecks.io service to check whether discord-bot is online or not.
It can triggers alerts on several systems if it is down.

If you don't want to use it, leave uuid empty.

You can use your own version by using a custom base_url.

JSON configuration used:

"healthchecks": {
  "base_url": "https://hc-ping.com/",
  "uuid": "00000000-0000-0000-0000-000000000000",
  "started_message": "discord-bot started",
  "failed_message": "discord-bot failed"
}

JSON Parameter	Mandatory	Type	Default value	Description
base_url	NO	string	https://hc-ping.com/	url to ping, by default use the healthchecks service
uuid	YES	string		uuid, on healthchecks dashboard it's after https://hc-ping.com/
started_message	NO	string	discord-bot started	message sent to healthchecks when discord-bot starts
failed_message	NO	string	discord-bot failed	message sent to healthchecks when discord-bot stops

How it works?

Each time you start discord-bot, the healthchecks module will check the configuration in config.json.
Then, when all modules have been started, it sends a Start ping message to indicate that the discord-bot is up and running.
Finally, if discord-bot receives a signal from the OS to terminate the program, it will send a Fail ping message.

Welcome

Define the user's role when using an emoji.
You can define one or more messages in only one channel.
In each message you can define title, description, color, role and emoji to use.

You can see an example below:

JSON configuration used:

"welcome": {
  "channel": "😃test",
  "messages": [
    {
      "title": "Are you interested by blueprintUE?",
      "description": "Click the :blueprintUE: below to join the blueprintUE part",
      "color": 5301186,
      "role": "is member",
      "emoji": "blueprintUE",
      "can_purge_reactions": true,
      "purge_threshold_members_reacted": 100,
      "purge_below_count_members_not_in_guild": 10
    }
  ]
}

Channel

You can define only one channel.

JSON Parameter	Mandatory	Type	Description
channel	YES	string	channel name

Message

You can defines multiple messages.

JSON Parameter	Mandatory	Type	Default value	Description
title	YES	string		title's message
description	YES	string		description's message
color	NO	int	0	color on the left of the message (format is integer representation of hexadecimal color code)
role	YES	string		role's name to assign when user use correct emoji
emoji	YES	string		emoji to use (format is my_emoji without :)
can_purge_reactions	NO	bool	false	only on startup, allow the purging of reactions from users who are not on the Discord server
purge_threshold_members_reacted	NO	int	0	threshold for the number of users having reacted to the message
purge_below_count_members_not_in_guild	NO	int	0	purge only if the number of invalid users is below a certain threshold

How it works?

Each time you start discord-bot, welcome module will check the configuration in the config.json.
If there is nothing missing, it will fetch channels, roles and emoji.
Then it will do another check to see if channel, role and emoji exists.

Secondly it will listen two events on onMessageReactionAdd and onMessageReactionRemove.

After it will search the last 100 messages in the channel.
If the message is not found then it will publish it and add a reaction to show user which emoji to use.
If the message is found then it will fetch all reactions by the users and apply role.

If the user is no longer in the Discord server and you have set can_purge_reactions to true then it will:

1. check purge_threshold_members_reacted whether the threshold for the number of users who have reacted to the message has been exceeded or equal.
2. check purge_below_count_members_not_in_guild whether the number of invalid users is below or equal a certain threshold.

If the answer to these questions is positive, the reaction to the message will be deleted.
For example you can set purge_threshold_members_reacted to 150 and purge_below_count_members_not_in_guild to 10.
It will purge only if you have 150 or more reactions and only 10 or less users not in the server.