demize/ghirahim_rs

Ghirahim_Bot is a Twitch IRC bot designed specifically to delete links from chat without timing users out, and with robust link detection.

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Ghirahim_Bot: A Twitch IRC bot to defeat links

Ghirahim_Bot is a Twitch IRC bot designed specifically to delete links from chat without timing users out, and with robust link detection. It will delete individual messages, and it will only detect links with valid TLDs: no more erasing someone's whole chat history because they forgot a space!

If you just want to use the bot, the instructions are in the next section. If you want to run the bot yourself, skip to the Running the bot yourself section.

Using the bot without running it

The bot should be running as the Twitch user Ghirahim_Bot, and you can use it!

Joining and leaving

Joining

To have the bot join your channel, go to its channel and type !join. It will respond indicating it's joined your channel. It's possible that it might fail to join if it's up against the rate limit; if it doesn't respond to commands in your channel, you can always tell it to !join again.

Once the bot joins your channel you need to add it as a mod for it to function (/mod Girahim_Bot). If you do not make the bot a mod, and it tries to delete a message, send duplicate messages, or send messages too quickly, then it will put your channel in a 5-minute cooldown. While in this cooldown, it will not respond to any messages in your channel (commands or messages with links).

By default, the bot will delete any link posted by anyone who is not a VIP, mod, or the broadcaster. See the configuring the bot section for details on how to allow specific domains or change the default settings.

Leaving

To have the bot leave your channel, go to its channel and type !leave. It will no longer respond to commands or delete messages in your channel. It should leave immediately, but again, it's possible it could run up against the rate limit; if this is the case, it will leave the next time it receives a message in your channel.

Configuring the bot

The bot offers a number of configuation commands:

Command	Description	Default	Valid values
!links list	Print the current allow list for the channel	Empty	N/A
!links allow	Add a new link to the allow list	N/A	Any domain (or a list of space-separated domains)
!links deny	Remove a link from the allow list	N/A	Any domain (or a list of space-separated domains)
!links slash	Slash matching: if enabled, URLs will be considered for removal if they have a slash in them. If disabled, they will be considered for removal regardless of a slash. (e.g. google.com/ or https://google.com (if Yes) or just google.com (if No))	Yes	Enable: yes, true Disable: no, false
!links dot	Dot matching: if enabled, URLs will be considered for removal if they have more than one dot (e.g. www.google.com or example.org/index.html). This has practically no effect if slash matching is disabled; it is designed to counteract some of the downsides of slash matching.	Yes	Enable: yes, true Disable: no, false
!links subdomains	Whether to match domains including subdomains or strictly (e.g. whether www.google.com would be allowed by google.com or not)	Yes	Include: yes, true Strict matching: no, false
!links role	The minimum role a user must have to be allowed to post links Roles are evaluated according to the following hierarchy: Broadcaster > Moderator > VIP > Subscriber > User. Setting the role to Moderator or higher will prevent anyone but moderators from posting links; setting it to User will allow anyone to post links.	VIP	Subscriber, VIP, Moderator (User and Broadcaster will work but are not recommended)
!links reply	How to reply to users when their messages are deleted. Put __user__ or @__user__ in the reply message to specify where the user is mentioned; otherwise a user mention will be prefixed to the beginning of the message.	@__user__, please ask for permission before posting a link.	Any string

The allow command and deny command can also be called as add and remove/del respectively.

If you want to test your channel settings, you can use the !links test command. Any text following !links test will be parsed per your channel settings, and the bot will reply saying whether it would have deleted the message or not.

Advanced URL matching

The bot has support for two additional features when matching URLs: wildcards and regexes.

You can provide a wildcard domain in the format *.example.org and it will match any subdomains of that domain. Note that this will truly match any subdomain, i.e. a.b.example.org and a.example.org will both match.

You can also provide a regex to match on. Note that there is a tight timeout on regex execution, and the bot will remove any regexes where the timeout expires (with a message in chat advising you of it). To add a regex, use the format /regex/. Regexes will be matched on the full URL, including scheme, so your regexes should keep that in mind; any URL sent in chat without a scheme will have http:// prepended to it due to internal processing.

Using the bot

Once configured, the bot will work by itself. Unless you need to change any further settings, you will not need to use the !links commands again.

To allow a user to post a link temporarily, issue the user a permit with !permit <user>. The user specified will be allowed to post links for 5 minutes.

Limitations

• The bot will not detect links that are hidden/obfuscated. In general, if you can click on them and they're real, it will detect them; if you can't click on them, it will ignore them.
• The bot will mistakenly detect links from mistyped messages (e.g. hello.how are you doing) if the mistyped message includes a valid domain (with a valid TLD per IANA's current list). To prevent this, you can turn on the slash option (which is enabled by default). If the slash option is too lenient, you can also enable the dot option to detect links that contain multiple dots.

Running the bot yourself

Prerequisites

You'll need the following to run Ghirahim_Bot yourself:

• A Twitch account, preferably (but not necessarily) a dedicated one
• A registered Twitch application, with a client ID

• An OAuth token for your registered application, with at minimum the chat:read, chat:edit, and moderator:manage:chat_messages scopes, created by your bot account

  • You can generate this by authorizing your application with the following URL from your bot account: https://id.twitch.tv/oauth2/authorize?response_type=token&scope=chat%3Aread+chat%3Aedit+moderator%3Amanage%3Achat_messages&client_id=[YOUR CLIENT ID]&redirect_uri=[YOUR REDIRECT URI]. The redirect URI can be anything; it doesn't really matter in this context, so long as you can copy the token from the resulting URL.

• A redis server
• A mongodb server

The following packages are also required (exact packages may vary based on your OS and package manager):

• C compiler/linker/ar (just install build-essential on Ubuntu/Debian)
• libssl-dev
• pkg-config

Setup

All config is kept in girahim.yaml. Copy ghirahim.yaml.sample to ghirahim.yaml and edit the settings. Ensure that you specify an OAuth token matching your client ID, and that it's specified as in the sample file (that is, with no oauth: prefix).

Once the config is set up, you can build the bot with cargo build or cargo build --release. There are some test cases that you can run with cargo test as well.

Running the bot

The executable produced by cargo (target/*/ghirahim_bot) can be copied out of the target directory and run directly. Running the bot under its own account is recommended. It can be easily run as a service with a basic systemd unit file; it does not fork, so it should be run with exec, and it will print all log messages to stdout to be caught and logged by systemd.

Getting support

The primary way to get support should be through Github: for bugs or other issues, open an issue; for feature requests, start a discussion. That said, we do have a discord server that you can join for support if necessary.