From 8331fdf7e0ea85ecc6d7dbff00b784bb6aa1f7d4 Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Sun, 21 Feb 2021 19:50:12 +0100
Subject: [PATCH] Add server rules (#15769)

---
 app/controllers/about_controller.rb           |  1 +
 app/controllers/admin/rules_controller.rb     | 59 +++++++++++++++++++
 .../api/v1/instances/rules_controller.rb      | 17 ++++++
 app/javascript/styles/mastodon/about.scss     | 21 +++++++
 app/models/rule.rb                            | 22 +++++++
 app/policies/rule_policy.rb                   | 19 ++++++
 app/presenters/instance_presenter.rb          |  4 ++
 app/serializers/rest/instance_serializer.rb   |  4 +-
 app/serializers/rest/rule_serializer.rb       |  9 +++
 app/views/about/more.html.haml                | 13 ++++
 app/views/admin/rules/_rule.html.haml         | 11 ++++
 app/views/admin/rules/edit.html.haml          | 11 ++++
 app/views/admin/rules/index.html.haml         | 24 ++++++++
 config/locales/en.yml                         |  7 +++
 config/locales/simple_form.en.yml             |  4 ++
 config/navigation.rb                          |  1 +
 config/routes.rb                              |  2 +
 db/migrate/20210221045109_create_rules.rb     | 11 ++++
 db/schema.rb                                  | 10 +++-
 spec/fabricators/rule_fabricator.rb           |  5 ++
 spec/models/rule_spec.rb                      |  5 ++
 21 files changed, 258 insertions(+), 2 deletions(-)
 create mode 100644 app/controllers/admin/rules_controller.rb
 create mode 100644 app/controllers/api/v1/instances/rules_controller.rb
 create mode 100644 app/models/rule.rb
 create mode 100644 app/policies/rule_policy.rb
 create mode 100644 app/serializers/rest/rule_serializer.rb
 create mode 100644 app/views/admin/rules/_rule.html.haml
 create mode 100644 app/views/admin/rules/edit.html.haml
 create mode 100644 app/views/admin/rules/index.html.haml
 create mode 100644 db/migrate/20210221045109_create_rules.rb
 create mode 100644 spec/fabricators/rule_fabricator.rb
 create mode 100644 spec/models/rule_spec.rb

diff --git a/app/controllers/about_controller.rb b/app/controllers/about_controller.rb
index dcad5d3b44..d7e78d6b91 100644
--- a/app/controllers/about_controller.rb
+++ b/app/controllers/about_controller.rb
@@ -20,6 +20,7 @@ class AboutController < ApplicationController
 
     toc_generator = TOCGenerator.new(@instance_presenter.site_extended_description)
 
+    @rules             = Rule.ordered
     @contents          = toc_generator.html
     @table_of_contents = toc_generator.toc
     @blocks            = DomainBlock.with_user_facing_limitations.by_severity if display_blocks?
diff --git a/app/controllers/admin/rules_controller.rb b/app/controllers/admin/rules_controller.rb
new file mode 100644
index 0000000000..f3bed3ad8e
--- /dev/null
+++ b/app/controllers/admin/rules_controller.rb
@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+module Admin
+  class RulesController < BaseController
+    before_action :set_rule, except: [:index, :create]
+
+    def index
+      authorize :rule, :index?
+
+      @rules = Rule.ordered
+      @rule  = Rule.new
+    end
+
+    def create
+      authorize :rule, :create?
+
+      @rule = Rule.new(resource_params)
+
+      if @rule.save
+        redirect_to admin_rules_path
+      else
+        @rules = Rule.ordered
+        render :index
+      end
+    end
+
+    def edit
+      authorize @rule, :update?
+    end
+
+    def update
+      authorize @rule, :update?
+
+      if @rule.update(resource_params)
+        redirect_to admin_rules_path
+      else
+        render :edit
+      end
+    end
+
+    def destroy
+      authorize @rule, :destroy?
+
+      @rule.discard
+
+      redirect_to admin_rules_path
+    end
+
+    private
+
+    def set_rule
+      @rule = Rule.find(params[:id])
+    end
+
+    def resource_params
+      params.require(:rule).permit(:text, :priority)
+    end
+  end
+end
diff --git a/app/controllers/api/v1/instances/rules_controller.rb b/app/controllers/api/v1/instances/rules_controller.rb
new file mode 100644
index 0000000000..93cf3c7594
--- /dev/null
+++ b/app/controllers/api/v1/instances/rules_controller.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class Api::V1::Instances::RulesController < Api::BaseController
+  skip_before_action :require_authenticated_user!, unless: :whitelist_mode?
+
+  before_action :set_rules
+
+  def index
+    render json: @rules, each_serializer: REST::RuleSerializer
+  end
+
+  private
+
+  def set_rules
+    @rules = Rule.ordered
+  end
+end
diff --git a/app/javascript/styles/mastodon/about.scss b/app/javascript/styles/mastodon/about.scss
index d6bd9e3c60..281f5b2bfe 100644
--- a/app/javascript/styles/mastodon/about.scss
+++ b/app/javascript/styles/mastodon/about.scss
@@ -884,3 +884,24 @@ $small-breakpoint: 960px;
   }
 }
 
+.rules-list {
+  background: darken($ui-base-color, 2%);
+  border: 1px solid darken($ui-base-color, 8%);
+  border-radius: 4px;
+  padding: 0.5em 2.5em !important;
+  margin-top: 1.85em !important;
+
+  li {
+    border-bottom: 1px solid lighten($ui-base-color, 4%);
+    color: $dark-text-color;
+    padding: 1em;
+
+    &:last-child {
+      border-bottom: 0;
+    }
+  }
+
+  &__text {
+    color: $primary-text-color;
+  }
+}
diff --git a/app/models/rule.rb b/app/models/rule.rb
new file mode 100644
index 0000000000..7b62f2b354
--- /dev/null
+++ b/app/models/rule.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: rules
+#
+#  id         :bigint(8)        not null, primary key
+#  priority   :integer          default(0), not null
+#  deleted_at :datetime
+#  text       :text             default(""), not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+class Rule < ApplicationRecord
+  include Discard::Model
+
+  self.discard_column = :deleted_at
+
+  validates :text, presence: true, length: { maximum: 300 }
+
+  scope :ordered, -> { kept.order(priority: :asc) }
+end
diff --git a/app/policies/rule_policy.rb b/app/policies/rule_policy.rb
new file mode 100644
index 0000000000..6a4def0090
--- /dev/null
+++ b/app/policies/rule_policy.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class RulePolicy < ApplicationPolicy
+  def index?
+    staff?
+  end
+
+  def create?
+    admin?
+  end
+
+  def update?
+    admin?
+  end
+
+  def destroy?
+    admin?
+  end
+end
diff --git a/app/presenters/instance_presenter.rb b/app/presenters/instance_presenter.rb
index 1bfdd40ac9..8cd774abe8 100644
--- a/app/presenters/instance_presenter.rb
+++ b/app/presenters/instance_presenter.rb
@@ -16,6 +16,10 @@ class InstancePresenter
     Account.find_local(Setting.site_contact_username.strip.gsub(/\A@/, ''))
   end
 
+  def rules
+    Rule.ordered
+  end
+
   def user_count
     Rails.cache.fetch('user_count') { User.confirmed.joins(:account).merge(Account.without_suspended).count }
   end
diff --git a/app/serializers/rest/instance_serializer.rb b/app/serializers/rest/instance_serializer.rb
index b388e448e3..d39092b56d 100644
--- a/app/serializers/rest/instance_serializer.rb
+++ b/app/serializers/rest/instance_serializer.rb
@@ -9,7 +9,9 @@ class REST::InstanceSerializer < ActiveModel::Serializer
 
   has_one :contact_account, serializer: REST::AccountSerializer
 
-  delegate :contact_account, to: :instance_presenter
+  has_many :rules, serializer: REST::RuleSerializer
+
+  delegate :contact_account, :rules, to: :instance_presenter
 
   def uri
     Rails.configuration.x.local_domain
diff --git a/app/serializers/rest/rule_serializer.rb b/app/serializers/rest/rule_serializer.rb
new file mode 100644
index 0000000000..fc925925a9
--- /dev/null
+++ b/app/serializers/rest/rule_serializer.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class REST::RuleSerializer < ActiveModel::Serializer
+  attributes :id, :text
+
+  def id
+    object.id.to_s
+  end
+end
diff --git a/app/views/about/more.html.haml b/app/views/about/more.html.haml
index 109b5fa863..3c5f4f6f1c 100644
--- a/app/views/about/more.html.haml
+++ b/app/views/about/more.html.haml
@@ -48,6 +48,16 @@
     - else
       .box-widget
         .rich-formatting
+          - unless @rules.empty?
+            %h2#rules= t('about.rules')
+
+            %p= t('about.rules_html')
+
+            %ol.rules-list
+              - @rules.each do |rule|
+                %li
+                  .rules-list__text= rule.text
+
           = @contents.html_safe
 
           - if display_blocks? && !@blocks.empty?
@@ -70,6 +80,9 @@
 
   .column-4
     %ul.table-of-contents
+      - unless @rules.empty?
+        %li= link_to t('about.rules'), '#rules'
+
       - @table_of_contents.each do |item|
         %li
           = link_to item.title, "##{item.anchor}"
diff --git a/app/views/admin/rules/_rule.html.haml b/app/views/admin/rules/_rule.html.haml
new file mode 100644
index 0000000000..f8a9ac7868
--- /dev/null
+++ b/app/views/admin/rules/_rule.html.haml
@@ -0,0 +1,11 @@
+.announcements-list__item
+  = link_to edit_admin_rule_path(rule), class: 'announcements-list__item__title' do
+    = "#{rule_counter + 1}."
+    = truncate(rule.text)
+
+  .announcements-list__item__action-bar
+    .announcements-list__item__meta
+      = rule.text
+
+    %div
+      = table_link_to 'trash', t('admin.rules.delete'), admin_rule_path(rule), method: :delete, data: { confirm: t('admin.accounts.are_you_sure') } if can?(:destroy, rule)
diff --git a/app/views/admin/rules/edit.html.haml b/app/views/admin/rules/edit.html.haml
new file mode 100644
index 0000000000..ba7e6451a1
--- /dev/null
+++ b/app/views/admin/rules/edit.html.haml
@@ -0,0 +1,11 @@
+- content_for :page_title do
+  = t('admin.rules.edit')
+
+= simple_form_for @rule, url: admin_rule_path(@rule) do |f|
+  = render 'shared/error_messages', object: @rule
+
+  .fields-group
+    = f.input :text, wrapper: :with_block_label
+
+  .actions
+    = f.button :button, t('generic.save_changes'), type: :submit
diff --git a/app/views/admin/rules/index.html.haml b/app/views/admin/rules/index.html.haml
new file mode 100644
index 0000000000..3b069d083f
--- /dev/null
+++ b/app/views/admin/rules/index.html.haml
@@ -0,0 +1,24 @@
+- content_for :page_title do
+  = t('admin.rules.title')
+
+.simple_form
+  %p.hint= t('admin.rules.description')
+
+- if can? :create, :rule
+  = simple_form_for @rule, url: admin_rules_path do |f|
+    = render 'shared/error_messages', object: @rule
+
+    .fields-group
+      = f.input :text, wrapper: :with_block_label
+
+    .actions
+      = f.button :button, t('admin.rules.add_new'), type: :submit
+
+  %hr.spacer/
+
+- if @rules.empty?
+  %div.muted-hint.center-text
+    = t 'admin.rules.empty'
+- else
+  .announcements-list
+    = render partial: 'rule', collection: @rules
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 8245397d7c..0c38c5ae11 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -26,6 +26,8 @@ en:
       It is used for federation purposes and should not be blocked unless you want to block the whole instance, in which case you should use a domain block.
     learn_more: Learn more
     privacy_policy: Privacy policy
+    rules: Server rules
+    rules_html: 'Below is a summary of rules you need to follow if you want to have an account on this server of Mastodon:'
     see_whats_happening: See what's happening
     server_stats: 'Server stats:'
     source_code: Source code
@@ -542,6 +544,11 @@ en:
       unassign: Unassign
       unresolved: Unresolved
       updated_at: Updated
+    rules:
+      add_new: Add rule
+      description: While most claim to have read and agree to the terms of service, usually people do not read through until after a problem arises. Make it easier to see your server's rules at a glance by providing them in a flat bullet point list. Try to keep individual rules short and simple, but try not to split them up into many separate items either.
+      edit: Edit rule
+      title: Server rules
     settings:
       activity_api_enabled:
         desc_html: Counts of locally posted statuses, active users, and new registrations in weekly buckets
diff --git a/config/locales/simple_form.en.yml b/config/locales/simple_form.en.yml
index 20c9165602..4b5ff7ae8e 100644
--- a/config/locales/simple_form.en.yml
+++ b/config/locales/simple_form.en.yml
@@ -73,6 +73,8 @@ en:
           no_access: Block access to all resources
           sign_up_requires_approval: New sign-ups will require your approval
         severity: Choose what will happen with requests from this IP
+      rule:
+        text: Describe a rule or requirement for users on this server. Try to keep it short and simple
       sessions:
         otp: 'Enter the two-factor code generated by your phone app or use one of your recovery codes:'
         webauthn: If it's an USB key be sure to insert it and, if necessary, tap it.
@@ -197,6 +199,8 @@ en:
         reblog: Someone boosted your status
         report: New report is submitted
         trending_tag: An unreviewed hashtag is trending
+      rule:
+        text: Rule
       tag:
         listable: Allow this hashtag to appear in searches and on the profile directory
         name: Hashtag
diff --git a/config/navigation.rb b/config/navigation.rb
index 4a56abe18c..3a82c7971b 100644
--- a/config/navigation.rb
+++ b/config/navigation.rb
@@ -47,6 +47,7 @@ SimpleNavigation::Configuration.run do |navigation|
     n.item :admin, safe_join([fa_icon('cogs fw'), t('admin.title')]), admin_dashboard_url, if: proc { current_user.staff? } do |s|
       s.item :dashboard, safe_join([fa_icon('tachometer fw'), t('admin.dashboard.title')]), admin_dashboard_url
       s.item :settings, safe_join([fa_icon('cogs fw'), t('admin.settings.title')]), edit_admin_settings_url, if: -> { current_user.admin? }, highlights_on: %r{/admin/settings}
+      s.item :rules, safe_join([fa_icon('gavel fw'), t('admin.rules.title')]), admin_rules_path, highlights_on: %r{/admin/rules}
       s.item :announcements, safe_join([fa_icon('bullhorn fw'), t('admin.announcements.title')]), admin_announcements_path, highlights_on: %r{/admin/announcements}
       s.item :custom_emojis, safe_join([fa_icon('smile-o fw'), t('admin.custom_emojis.title')]), admin_custom_emojis_url, highlights_on: %r{/admin/custom_emojis}
       s.item :relays, safe_join([fa_icon('exchange fw'), t('admin.relays.title')]), admin_relays_url, if: -> { current_user.admin? && !whitelist_mode? }, highlights_on: %r{/admin/relays}
diff --git a/config/routes.rb b/config/routes.rb
index fd118f1d61..0ff48cf482 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -220,6 +220,7 @@ Rails.application.routes.draw do
     end
 
     resources :instances, only: [:index, :show], constraints: { id: /[^\/]+/ }
+    resources :rules
 
     resources :reports, only: [:index, :show] do
       member do
@@ -405,6 +406,7 @@ Rails.application.routes.draw do
       resource :instance, only: [:show] do
         resources :peers, only: [:index], controller: 'instances/peers'
         resource :activity, only: [:show], controller: 'instances/activity'
+        resources :rules, only: [:index], controller: 'instances/rules'
       end
 
       resource :domain_blocks, only: [:show, :create, :destroy]
diff --git a/db/migrate/20210221045109_create_rules.rb b/db/migrate/20210221045109_create_rules.rb
new file mode 100644
index 0000000000..abe2fd42a0
--- /dev/null
+++ b/db/migrate/20210221045109_create_rules.rb
@@ -0,0 +1,11 @@
+class CreateRules < ActiveRecord::Migration[5.2]
+  def change
+    create_table :rules do |t|
+      t.integer :priority, null: false, default: 0
+      t.datetime :deleted_at
+      t.text :text, null: false, default: ''
+
+      t.timestamps
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 18bf1d4ca8..4b85fce8dc 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_12_18_054746) do
+ActiveRecord::Schema.define(version: 2021_02_21_045109) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -723,6 +723,14 @@ ActiveRecord::Schema.define(version: 2020_12_18_054746) do
     t.index ["target_account_id"], name: "index_reports_on_target_account_id"
   end
 
+  create_table "rules", force: :cascade do |t|
+    t.integer "priority", default: 0, null: false
+    t.datetime "deleted_at"
+    t.text "text", default: "", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
   create_table "scheduled_statuses", force: :cascade do |t|
     t.bigint "account_id"
     t.datetime "scheduled_at"
diff --git a/spec/fabricators/rule_fabricator.rb b/spec/fabricators/rule_fabricator.rb
new file mode 100644
index 0000000000..4bdfd05e0e
--- /dev/null
+++ b/spec/fabricators/rule_fabricator.rb
@@ -0,0 +1,5 @@
+Fabricator(:rule) do
+  priority   ""
+  deleted_at "2021-02-21 05:51:09"
+  text       "MyText"
+end
\ No newline at end of file
diff --git a/spec/models/rule_spec.rb b/spec/models/rule_spec.rb
new file mode 100644
index 0000000000..8666bda713
--- /dev/null
+++ b/spec/models/rule_spec.rb
@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe Rule, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end