Add simple admin overview of PuSH subscriptions

app/assets/stylesheets/application.scss

@@ -234,3 +234,4 @@ body {
 @import 'stream_entries';
 @import 'components';
 @import 'about';
+@import 'tables';

app/assets/stylesheets/tables.scss

@@ -0,0 +1,25 @@
+.table {
+  width: 100%;
+  max-width: 100%;
+  border-spacing: 0;
+  border-collapse: collapse;
+
+  th, td {
+    padding: 8px;
+    line-height: 1.42857143;
+    vertical-align: top;
+    border-top: 1px solid #ddd;
+    text-align: left;
+  }
+
+  & > thead > tr > th {
+    vertical-align: bottom;
+    border-bottom: 2px solid #ddd;
+    border-top: 0;
+    font-weight: 500;
+  }
+}
+
+samp {
+  font-family: 'Roboto Mono', monospace;
+}

app/controllers/admin/pubsubhubbub_controller.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class Admin::PubsubhubbubController < ApplicationController
+  before_action :require_admin!
+
+  layout 'public'
+
+  def index
+    @subscriptions = Subscription.includes(:account).paginate(page: params[:page], per_page: 40)
+  end
+end

app/controllers/application_controller.rb

@@ -31,6 +31,10 @@ class ApplicationController < ActionController::Base
     I18n.locale = I18n.default_locale
   end
 
+  def require_admin!
+    redirect_to root_path unless current_user&.admin?
+  end
+
   protected
 
   def not_found

app/helpers/admin/pubsubhubbub_helper.rb

@@ -0,0 +1,2 @@
+module Admin::PubsubhubbubHelper
+end

app/views/admin/pubsubhubbub/index.html.haml

@@ -0,0 +1,20 @@
+%table.table
+  %thead
+    %tr
+      %th Topic
+      %th Callback URL
+      %th Confirmed
+      %th Expires in
+  %tbody
+    - @subscriptions.each do |subscription|
+      %tr
+        %td
+          %samp= subscription.account.acct
+        %td
+          %samp= subscription.callback_url
+        %td
+          - if subscription.confirmed?
+            %i.fa.fa-check
+        %td= distance_of_time_in_words(Time.now, subscription.expires_at)
+
+= will_paginate @subscriptions, pagination_options