Mastodon anti-spam patch

Background

Recently mastoadmins have been hit by a flood of spam posts. This patch will prevent spam posts from flowing into your instance, cutting off the hazzles of reporting, suspending, and removing spam from database procedures.

Installation

cd into your mastodon installation directory:

# Download patch from github
wget https://raw.githubusercontent.com/dragonfly-club/mastodon-antispam/main/antispam.patch

# Modify according to your needs (optional)
vim antispam.patch

# Apply patch
git apply antispam.patch

And restart ingress sidekiq queue:

# As root
systemctl restart mastodon-sidekiq

# Or, if you have modified systemd services
systemctl restart mastodon-sidekiq-ingress

When spam posts hit your instance, your ingress sidekiq should log something like:

Rejected 荒らし.com spam from https://xxx.social/users/xxx with content <p><a href="https://荒らし.com/" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://</span><span class="">荒らし.com/</span><span class="invisible"></span></a></p><p><span class="h-card" translate="no"><a href="https://mast.dragon-fly.club/@abc" class="u-url mention">@<span>abc</span></a></span> <span class="h-card" translate="no"><a href="https://mast.dragon-fly.club/@def" class="u-url mention">@<span>def</span></a></span> <span class="h-card" translate="no"><a href="https://mast.dragon-fly.club/@ghi" class="u-url mention">@<span>ghi</span></a></span><br /><span class="h-card" translate="no"><a href="https://mast.dragon-fly.club/@jkl" class="u-url mention">@<span>jkl</span></a></span></p>

Advantages

No need for human intervention, the instance itself will handle all the process.

Disadvantages

The post won't be reported, and the account won't be blacklist.