feat: fediblock

app/models/activity_pub/fediblock.rb

@@ -0,0 +1,77 @@
+# frozen_string_literal: true
+
+require 'httparty'
+
+# Listas de bloqueo y sus URLs de descarga
+class ActivityPub
+  class Fediblock < ApplicationRecord
+    class Client
+      include ::HTTParty
+
+      # @param url [String]
+      # @return [HTTParty::Response]
+      def get(url)
+        self.class.get(url, parser: csv_parser)
+      end
+
+      # Procesa el CSV
+      #
+      # @return [Proc]
+      def csv_parser
+        @csv_parser ||=
+          begin
+            require 'csv'
+
+            proc do |body, _|
+              CSV.parse(body, headers: true)
+            end
+          end
+      end
+    end
+
+    class FediblockDownloadError < ::StandardError; end
+
+    validates_presence_of :title, :url, :download_url, :format
+    validates_inclusion_of :format, in: %w[mastodon fediblock]
+
+    HOSTNAME_HEADERS = {
+      'mastodon'  => '#domain',
+      'fediblock' => 'domain'
+    }
+
+    def client
+      @client ||= Client.new
+    end
+
+    # Descarga la lista y crea las instancias con el estado necesario
+    def process!
+      response = client.get(download_url)
+
+      raise FediblockDownloadError unless response.ok?
+
+      Fediblock.transaction do
+        csv = response.parsed_response
+        process_csv! csv
+
+        update(instances: csv.map { |r| r[hostname_header] })
+      end
+    end
+
+    private
+
+    def hostname_header
+      HOSTNAME_HEADERS[format]
+    end
+
+    # Crea o encuentra instancias que ya existían y las bloquea
+    #
+    # @param csv [CSV::Table]
+    def process_csv!(csv)
+      csv.each do |row|
+        ActivityPub::Instance.find_or_create_by(hostname: row[hostname_header]).tap do |i|
+          i.block! if i.may_block?
+        end
+      end
+    end
+  end
+end

app/models/activity_pub/instance.rb

@@ -21,6 +21,12 @@ class ActivityPub
       state :paused, initial: true
       state :allowed
       state :blocked
+
+      # Al pasar una instancia a bloqueo, quiere decir que todos los
+      # sitios adoptan esta lista
+      event :block do
+        transitions from: %i[paused allowed], to: :blocked
+      end
     end
 
     def list_name

db/migrate/20240227134845_create_fediblocks.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+# Las fediblocks son listas descargables de instancias bloqueadas.  El
+# formato hace una recomendación sobre suspensión o desfederación, pero
+# nosotres bloqueamos todo.
+class CreateFediblocks < ActiveRecord::Migration[6.1]
+  def up
+    create_table :activity_pub_fediblocks, id: :uuid do |t|
+      t.timestamps
+
+      t.string :title, null: false
+      t.string :url, null: false
+      t.string :download_url, null: false
+      t.string :format, null: false
+      t.jsonb  :instances, default: []
+    end
+
+    YAML.safe_load(File.read('db/seeds/activity_pub/fediblocks.yml')).each do |fediblock|
+      ActivityPub::Fediblock.create(**fediblock).process!
+    end
+  end
+
+  def down
+    drop_table :activity_pub_fediblocks
+  end
+end

db/seeds.rb

@@ -27,3 +27,9 @@ if PrivacyPolicy.count.zero?
     PrivacyPolicy.new(**pp).save!
   end
 end 
+
+YAML.safe_load(File.read('db/seeds/activity_pub/fediblocks.yml')).each do |fediblock|
+  ActivityPub::Fediblock.find_or_create_by(id: fediblock['id']).tap do |f|
+    f.update(**fediblock)
+  end
+end

db/seeds/activity_pub/fediblocks.yml

@@ -0,0 +1,16 @@
+---
+- title: "Gardenfence"
+  url: "https://gardenfence.github.io/"
+  download_url: "https://github.com/gardenfence/blocklist/raw/main/gardenfence-fediblocksync.csv"
+  format: "fediblock"
+  id: "9046789a-5de8-4b16-beed-796060f8f3cc"
+- title: "Oliphant Tier 0"
+  url: "https://writer.oliphant.social/oliphant/the-oliphant-social-blocklist"
+  download_url: "https://codeberg.org/oliphant/blocklists/raw/branch/main/blocklists/mastodon/tier0.csv"
+  format: "mastodon"
+  id: "fc1efcb8-7e68-4a76-ae9e-0c447752b12b"
+- title: "The Bad Space (90%)"
+  url: "https://tweaking.thebad.space/exports"
+  download_url: "https://tweaking.thebad.space/exports/mastodon/90"
+  format: "fediblock"
+  id: "5dd6705a-c28f-4912-9456-07b0d4983108"

db/structure.sql

@@ -502,6 +502,22 @@ CREATE TABLE public.activity_pub_actors (
 );
 
 
+--
+-- Name: activity_pub_fediblocks; Type: TABLE; Schema: public; Owner: -
+--
+
+CREATE TABLE public.activity_pub_fediblocks (
+    id uuid DEFAULT gen_random_uuid() NOT NULL,
+    created_at timestamp(6) without time zone NOT NULL,
+    updated_at timestamp(6) without time zone NOT NULL,
+    title character varying NOT NULL,
+    url character varying NOT NULL,
+    download_url character varying NOT NULL,
+    format character varying NOT NULL,
+    instances jsonb DEFAULT '[]'::jsonb
+);
+
+
 --
 -- Name: activity_pub_instances; Type: TABLE; Schema: public; Owner: -
 --
@@ -1694,6 +1710,14 @@ ALTER TABLE ONLY public.activity_pub_actors
     ADD CONSTRAINT activity_pub_actors_pkey PRIMARY KEY (id);
 
 
+--
+-- Name: activity_pub_fediblocks activity_pub_fediblocks_pkey; Type: CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY public.activity_pub_fediblocks
+    ADD CONSTRAINT activity_pub_fediblocks_pkey PRIMARY KEY (id);
+
+
 --
 -- Name: activity_pub_instances activity_pub_instances_pkey; Type: CONSTRAINT; Schema: public; Owner: -
 --
@@ -2546,6 +2570,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20240221184007'),
 ('20240223170317'),
 ('20240226133022'),
-('20240226134335');
+('20240226134335'),
+('20240227134845');