Admin base controller (#1465)

* Add Admin::BaseController to wrap admin area

Extracts the setting of the `admin` layout and verifying that users are admins
to a common base class for the admin/ controllers.

* Add basic coverage for admin/reports and admin/settings controllers

app/controllers/admin/accounts_controller.rb

@@ -1,51 +1,50 @@
 # frozen_string_literal: true
 
-class Admin::AccountsController < ApplicationController
-  before_action :require_admin!
-  before_action :set_account, except: :index
+module Admin
+  class AccountsController < BaseController
+    before_action :set_account, except: :index
 
-  layout 'admin'
+    def index
+      @accounts = Account.alphabetic.paginate(page: params[:page], per_page: 40)
 
-  def index
-    @accounts = Account.alphabetic.paginate(page: params[:page], per_page: 40)
+      @accounts = @accounts.local                             if params[:local].present?
+      @accounts = @accounts.remote                            if params[:remote].present?
+      @accounts = @accounts.where(domain: params[:by_domain]) if params[:by_domain].present?
+      @accounts = @accounts.silenced                          if params[:silenced].present?
+      @accounts = @accounts.recent                            if params[:recent].present?
+      @accounts = @accounts.suspended                         if params[:suspended].present?
+    end
 
-    @accounts = @accounts.local                             if params[:local].present?
-    @accounts = @accounts.remote                            if params[:remote].present?
-    @accounts = @accounts.where(domain: params[:by_domain]) if params[:by_domain].present?
-    @accounts = @accounts.silenced                          if params[:silenced].present?
-    @accounts = @accounts.recent                            if params[:recent].present?
-    @accounts = @accounts.suspended                         if params[:suspended].present?
-  end
+    def show; end
 
-  def show; end
+    def suspend
+      Admin::SuspensionWorker.perform_async(@account.id)
+      redirect_to admin_accounts_path
+    end
 
-  def suspend
-    Admin::SuspensionWorker.perform_async(@account.id)
-    redirect_to admin_accounts_path
-  end
+    def unsuspend
+      @account.update(suspended: false)
+      redirect_to admin_accounts_path
+    end
 
-  def unsuspend
-    @account.update(suspended: false)
-    redirect_to admin_accounts_path
-  end
+    def silence
+      @account.update(silenced: true)
+      redirect_to admin_accounts_path
+    end
 
-  def silence
-    @account.update(silenced: true)
-    redirect_to admin_accounts_path
-  end
+    def unsilence
+      @account.update(silenced: false)
+      redirect_to admin_accounts_path
+    end
 
-  def unsilence
-    @account.update(silenced: false)
-    redirect_to admin_accounts_path
-  end
+    private
 
-  private
+    def set_account
+      @account = Account.find(params[:id])
+    end
 
-  def set_account
-    @account = Account.find(params[:id])
-  end
-
-  def account_params
-    params.require(:account).permit(:silenced, :suspended)
+    def account_params
+      params.require(:account).permit(:silenced, :suspended)
+    end
   end
 end