Add appeals (#17364)

* Add appeals

* Add ability to reject appeals and ability to browse pending appeals in admin UI

* Add strikes to account page in settings

* Various fixes and improvements

- Add separate notification setting for appeals, separate from reports
- Fix style of links in report/strike header
- Change approving an appeal to not restore statuses (due to federation complexities)
- Change style of successfully appealed strikes on account settings page
- Change account settings page to only show unappealed or recently appealed strikes

* Change appealed_at to overruled_at

* Fix missing method error

7 files changed, 126 insertions, 1 deletions

diff --git a/app/models/account.rb b/app/models/account.rb
index 771cc0b1b..2ad45feda 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -270,6 +270,10 @@ class Account < ApplicationRecord
     true
   end
 
+  def previous_strikes_count
+    strikes.where(overruled_at: nil).count
+  end
+
   def keypair
     @keypair ||= OpenSSL::PKey::RSA.new(private_key || public_key)
   end
diff --git a/app/models/account_filter.rb b/app/models/account_filter.rb
index 86b7f5f41..9da1522dd 100644
--- a/app/models/account_filter.rb
+++ b/app/models/account_filter.rb
@@ -24,6 +24,8 @@ class AccountFilter
     scope = Account.includes(:account_stat, user: [:ips, :invite_request]).without_instance_actor.reorder(nil)
 
     params.each do |key, value|
+      next if key.to_s == 'page'
+
       scope.merge!(scope_for(key, value.to_s.strip)) if value.present?
     end
 
diff --git a/app/models/account_warning.rb b/app/models/account_warning.rb
index fc0d988fd..05d01942d 100644
--- a/app/models/account_warning.rb
+++ b/app/models/account_warning.rb
@@ -12,6 +12,7 @@
 #  updated_at        :datetime         not null
 #  report_id         :bigint(8)
 #  status_ids        :string           is an Array
+#  overruled_at      :datetime
 #
 
 class AccountWarning < ApplicationRecord
@@ -28,12 +29,17 @@ class AccountWarning < ApplicationRecord
   belongs_to :target_account, class_name: 'Account', inverse_of: :strikes
   belongs_to :report, optional: true
 
-  has_one :appeal, dependent: :destroy
+  has_one :appeal, dependent: :destroy, inverse_of: :strike
 
   scope :latest, -> { order(id: :desc) }
   scope :custom, -> { where.not(text: '') }
+  scope :active, -> { where(overruled_at: nil).or(where('account_warnings.overruled_at >= ?', 30.days.ago)) }
 
   def statuses
     Status.with_discarded.where(id: status_ids || [])
   end
+
+  def overruled?
+    overruled_at.present?
+  end
 end
diff --git a/app/models/admin/action_log_filter.rb b/app/models/admin/action_log_filter.rb
index 12136223b..0f2f712a2 100644
--- a/app/models/admin/action_log_filter.rb
+++ b/app/models/admin/action_log_filter.rb
@@ -8,6 +8,8 @@ class Admin::ActionLogFilter
   ).freeze
 
   ACTION_TYPE_MAP = {
+    approve_appeal: { target_type: 'Appeal', action: 'approve' }.freeze,
+    reject_appeal: { target_type: 'Appeal', action: 'reject' }.freeze,
     assigned_to_self_report: { target_type: 'Report', action: 'assigned_to_self' }.freeze,
     change_email_user: { target_type: 'User', action: 'change_email' }.freeze,
     confirm_user: { target_type: 'User', action: 'confirm' }.freeze,
diff --git a/app/models/admin/appeal_filter.rb b/app/models/admin/appeal_filter.rb
new file mode 100644
index 000000000..b163d2e56
--- /dev/null
+++ b/app/models/admin/appeal_filter.rb
@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+class Admin::AppealFilter
+  KEYS = %i(
+    status
+  ).freeze
+
+  attr_reader :params
+
+  def initialize(params)
+    @params = params
+  end
+
+  def results
+    scope = Appeal.order(id: :desc)
+
+    params.each do |key, value|
+      next if %w(page).include?(key.to_s)
+
+      scope.merge!(scope_for(key, value.to_s.strip)) if value.present?
+    end
+
+    scope
+  end
+
+  private
+
+  def scope_for(key, value)
+    case key.to_s
+    when 'status'
+      status_scope(value)
+    else
+      raise "Unknown filter: #{key}"
+    end
+  end
+
+  def status_scope(value)
+    case value
+    when 'approved'
+      Appeal.approved
+    when 'rejected'
+      Appeal.rejected
+    when 'pending'
+      Appeal.pending
+    else
+      raise "Unknown status: #{value}"
+    end
+  end
+end
diff --git a/app/models/appeal.rb b/app/models/appeal.rb
new file mode 100644
index 000000000..46f35ae37
--- /dev/null
+++ b/app/models/appeal.rb
@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: appeals
+#
+#  id                     :bigint(8)        not null, primary key
+#  account_id             :bigint(8)        not null
+#  account_warning_id     :bigint(8)        not null
+#  text                   :text             default(""), not null
+#  approved_at            :datetime
+#  approved_by_account_id :bigint(8)
+#  rejected_at            :datetime
+#  rejected_by_account_id :bigint(8)
+#  created_at             :datetime         not null
+#  updated_at             :datetime         not null
+#
+class Appeal < ApplicationRecord
+  belongs_to :account
+  belongs_to :strike, class_name: 'AccountWarning', foreign_key: 'account_warning_id'
+  belongs_to :approved_by_account, class_name: 'Account', optional: true
+  belongs_to :rejected_by_account, class_name: 'Account', optional: true
+
+  validates :text, presence: true, length: { maximum: 2_000 }
+  validates :account_warning_id, uniqueness: true
+
+  validate :validate_time_frame, on: :create
+
+  scope :approved, -> { where.not(approved_at: nil) }
+  scope :rejected, -> { where.not(rejected_at: nil) }
+  scope :pending, -> { where(approved_at: nil, rejected_at: nil) }
+
+  def pending?
+    !approved? && !rejected?
+  end
+
+  def approved?
+    approved_at.present?
+  end
+
+  def rejected?
+    rejected_at.present?
+  end
+
+  def approve!(current_account)
+    update!(approved_at: Time.now.utc, approved_by_account: current_account)
+  end
+
+  def reject!(current_account)
+    update!(rejected_at: Time.now.utc, rejected_by_account: current_account)
+  end
+
+  private
+
+  def validate_time_frame
+    errors.add(:base, I18n.t('strikes.errors.too_late')) if Time.now.utc > (strike.created_at + 20.days)
+  end
+end
diff --git a/app/models/user.rb b/app/models/user.rb
index fd1d7049a..517254a91 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -265,6 +265,10 @@ class User < ApplicationRecord
     settings.notification_emails['pending_account']
   end
 
+  def allows_appeal_emails?
+    settings.notification_emails['appeal']
+  end
+
   def allows_trending_tag_emails?
     settings.notification_emails['trending_tag']
   end