Add notifications for statuses deleted by moderators (#17204)

app/models/admin/status_batch_action.rb

@@ -0,0 +1,92 @@
+# frozen_string_literal: true
+
+class Admin::StatusBatchAction
+  include ActiveModel::Model
+  include AccountableConcern
+  include Authorization
+
+  attr_accessor :current_account, :type,
+                :status_ids, :report_id
+
+  def save!
+    process_action!
+  end
+
+  private
+
+  def statuses
+    Status.with_discarded.where(id: status_ids)
+  end
+
+  def process_action!
+    return if status_ids.empty?
+
+    case type
+    when 'delete'
+      handle_delete!
+    when 'report'
+      handle_report!
+    when 'remove_from_report'
+      handle_remove_from_report!
+    end
+  end
+
+  def handle_delete!
+    statuses.each { |status| authorize(status, :destroy?) }
+
+    ApplicationRecord.transaction do
+      statuses.each do |status|
+        status.discard
+        log_action(:destroy, status)
+      end
+
+      if with_report?
+        report.resolve!(current_account)
+        log_action(:resolve, report)
+      end
+
+      @warning = target_account.strikes.create!(
+        action: :delete_statuses,
+        account: current_account,
+        report: report,
+        status_ids: status_ids
+      )
+
+      statuses.each { |status| Tombstone.find_or_create_by(uri: status.uri, account: status.account, by_moderator: true) } unless target_account.local?
+    end
+
+    UserMailer.warning(target_account.user, @warning).deliver_later! if target_account.local?
+    RemovalWorker.push_bulk(status_ids) { |status_id| [status_id, preserve: target_account.local?, immediate: !target_account.local?] }
+  end
+
+  def handle_report!
+    @report = Report.new(report_params) unless with_report?
+    @report.status_ids = (@report.status_ids + status_ids.map(&:to_i)).uniq
+    @report.save!
+
+    @report_id = @report.id
+  end
+
+  def handle_remove_from_report!
+    return unless with_report?
+
+    report.status_ids -= status_ids.map(&:to_i)
+    report.save!
+  end
+
+  def report
+    @report ||= Report.find(report_id) if report_id.present?
+  end
+
+  def with_report?
+    !report.nil?
+  end
+
+  def target_account
+    @target_account ||= statuses.first.account
+  end
+
+  def report_params
+    { account: current_account, target_account: target_account }
+  end
+end