Revamp post filtering system (#18058)

* Add model for custom filter keywords

* Use CustomFilterKeyword internally

Does not change the API

* Fix /filters/edit and /filters/new

* Add migration tests

* Remove whole_word column from custom_filters (covered by custom_filter_keywords)

* Redesign /filters

Instead of a list, present a card that displays more information and handles
multiple keywords per filter.

* Redesign /filters/new and /filters/edit to add and remove keywords

This adds a new gem dependency: cocoon, as well as a npm dependency:
cocoon-js-vanilla. Those are used to easily populate and remove form fields
from the user interface when manipulating multiple keyword filters at once.

* Add /api/v2/filters to edit filter with multiple keywords

Entities:
- `Filter`: `id`, `title`, `filter_action` (either `hide` or `warn`), `context`
  `keywords`
- `FilterKeyword`: `id`, `keyword`, `whole_word`

API endpoits:
- `GET /api/v2/filters` to list filters (including keywords)
- `POST /api/v2/filters` to create a new filter
  `keywords_attributes` can also be passed to create keywords in one request
- `GET /api/v2/filters/:id` to read a particular filter
- `PUT /api/v2/filters/:id` to update a new filter
  `keywords_attributes` can also be passed to edit, delete or add keywords in
   one request
- `DELETE /api/v2/filters/:id` to delete a particular filter
- `GET /api/v2/filters/:id/keywords` to list keywords for a filter
- `POST /api/v2/filters/:filter_id/keywords/:id` to add a new keyword to a
   filter
- `GET /api/v2/filter_keywords/:id` to read a particular keyword
- `PUT /api/v2/filter_keywords/:id` to edit a particular keyword
- `DELETE /api/v2/filter_keywords/:id` to delete a particular keyword

* Change from `irreversible` boolean to `action` enum

* Remove irrelevent `irreversible_must_be_within_context` check

* Fix /filters/new and /filters/edit with update for filter_action

* Fix Rubocop/Codeclimate complaining about task names

* Refactor FeedManager#phrase_filtered?

This moves regexp building and filter caching to the `CustomFilter` class.

This does not change the functional behavior yet, but this changes how the
cache is built, doing per-custom_filter regexps so that filters can be matched
independently, while still offering caching.

* Perform server-side filtering and output result in REST API

* Fix numerous filters_changed events being sent when editing multiple keywords at once

* Add some tests

* Use the new API in the WebUI

- use client-side logic for filters we have fetched rules for.
  This is so that filter changes can be retroactively applied without
  reloading the UI.
- use server-side logic for filters we haven't fetched rules for yet
  (e.g. network error, or initial timeline loading)

* Minor optimizations and refactoring

* Perform server-side filtering on the streaming server

* Change the wording of filter action labels

* Fix issues pointed out by linter

* Change design of “Show anyway” link in accordence to review comments

* Drop “irreversible” filtering behavior

* Move /api/v2/filter_keywords to /api/v1/filters/keywords

* Rename `filter_results` attribute to `filtered`

* Rename REST::LegacyFilterSerializer to REST::V1::FilterSerializer

* Fix systemChannelId value in streaming server

* Simplify code by removing client-side filtering code

The simplifcation comes at a cost though: filters aren't retroactively
applied anymore.

1 files changed, 17 insertions, 1 deletions

diff --git a/lib/tasks/tests.rake b/lib/tasks/tests.rake
index 0f3b44a74..65bff6a8e 100644
--- a/lib/tasks/tests.rake
+++ b/lib/tasks/tests.rake
@@ -38,10 +38,26 @@ namespace :tests do
         puts 'Instance actor does not have a private key'
         exit(1)
       end
+
+      unless Account.find_by(username: 'user', domain: nil).custom_filters.map { |filter| filter.keywords.pluck(:keyword) } == [['test'], ['take']]
+        puts 'CustomFilterKeyword records not created as expected'
+        exit(1)
+      end
+    end
+
+    desc 'Populate the database with test data for 2.4.3'
+    task populate_v2_4_3: :environment do # rubocop:disable Naming/VariableNumber
+      ActiveRecord::Base.connection.execute(<<~SQL)
+        INSERT INTO "custom_filters"
+          (id, account_id, phrase, context, whole_word, irreversible, created_at, updated_at)
+        VALUES
+          (1, 2, 'test', '{ "home", "public" }', true, true, now(), now()),
+          (2, 2, 'take', '{ "home" }', false, false, now(), now());
+      SQL
     end
 
     desc 'Populate the database with test data for 2.4.0'
-    task populate_v2_4: :environment do
+    task populate_v2_4: :environment do # rubocop:disable Naming/VariableNumber
       ActiveRecord::Base.connection.execute(<<~SQL)
         INSERT INTO "settings"
           (id, thing_type, thing_id, var, value, created_at, updated_at)