Add explit admin actions to (re)subscribe/unsubscribe remote accounts (#3640)

* Add explit admin actions to (re)subscribe/unsubscribe remote accounts
and re-download avatar/header

* Improve how admin NSFW toggle looks

app/controllers/admin/accounts_controller.rb

@@ -2,16 +2,43 @@
 
 module Admin
   class AccountsController < BaseController
+    before_action :set_account, only: [:show, :subscribe, :unsubscribe, :redownload]
+    before_action :require_remote_account!, only: [:subscribe, :unsubscribe, :redownload]
+
     def index
       @accounts = filtered_accounts.page(params[:page])
     end
 
-    def show
-      @account = Account.find(params[:id])
+    def show; end
+
+    def subscribe
+      Pubsubhubbub::SubscribeWorker.perform_async(@account.id)
+      redirect_to admin_account_path(@account.id)
+    end
+
+    def unsubscribe
+      UnsubscribeService.new.call(@account)
+      redirect_to admin_account_path(@account.id)
+    end
+
+    def redownload
+      @account.avatar = @account.avatar_remote_url
+      @account.header = @account.header_remote_url
+      @account.save!
+
+      redirect_to admin_account_path(@account.id)
     end
 
     private
 
+    def set_account
+      @account = Account.find(params[:id])
+    end
+
+    def require_remote_account!
+      redirect_to admin_account_path(@account.id) if @account.local?
+    end
+
     def filtered_accounts
       AccountFilter.new(filter_params).results
     end