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, 0 insertions, 32 deletions

diff --git a/spec/lib/feed_manager_spec.rb b/spec/lib/feed_manager_spec.rb
index 3ba8aaa9f..48c57b86e 100644
--- a/spec/lib/feed_manager_spec.rb
+++ b/spec/lib/feed_manager_spec.rb
@@ -127,38 +127,6 @@ RSpec.describe FeedManager do
         reblog = Fabricate(:status, reblog: status, account: jeff)
         expect(FeedManager.instance.filter?(:home, reblog, alice)).to be true
       end
-
-      context 'for irreversibly muted phrases' do
-        it 'considers word boundaries when matching' do
-          alice.custom_filters.create!(phrase: 'bob', context: %w(home), irreversible: true)
-          alice.follow!(jeff)
-          status = Fabricate(:status, text: 'bobcats', account: jeff)
-          expect(FeedManager.instance.filter?(:home, status, alice)).to be_falsy
-        end
-
-        it 'returns true if phrase is contained' do
-          alice.custom_filters.create!(phrase: 'farts', context: %w(home public), irreversible: true)
-          alice.custom_filters.create!(phrase: 'pop tarts', context: %w(home), irreversible: true)
-          alice.follow!(jeff)
-          status = Fabricate(:status, text: 'i sure like POP TARts', account: jeff)
-          expect(FeedManager.instance.filter?(:home, status, alice)).to be true
-        end
-
-        it 'matches substrings if whole_word is false' do
-          alice.custom_filters.create!(phrase: 'take', context: %w(home), whole_word: false, irreversible: true)
-          alice.follow!(jeff)
-          status = Fabricate(:status, text: 'shiitake', account: jeff)
-          expect(FeedManager.instance.filter?(:home, status, alice)).to be true
-        end
-
-        it 'returns true if phrase is contained in a poll option' do
-          alice.custom_filters.create!(phrase: 'farts', context: %w(home public), irreversible: true)
-          alice.custom_filters.create!(phrase: 'pop tarts', context: %w(home), irreversible: true)
-          alice.follow!(jeff)
-          status = Fabricate(:status, text: 'what do you prefer', poll: Fabricate(:poll, options: %w(farts POP TARts)), account: jeff)
-          expect(FeedManager.instance.filter?(:home, status, alice)).to be true
-        end
-      end
     end
 
     context 'for mentions feed' do