Send email to contact_email if there are flags submitted more than 48 hours ago. Configurable with the notify_about_flags_after site setting.

app/jobs/scheduled/pending_flags_reminder.rb

@@ -0,0 +1,21 @@
+require_dependency 'flag_query'
+
+module Jobs
+
+  class PendingFlagsReminder < Jobs::Scheduled
+
+    every 1.day
+
+    def execute(args)
+      if SiteSetting.notify_about_flags_after > 0 &&
+         PostAction.flagged_posts_count > 0 &&
+         FlagQuery.flagged_post_actions('active').where('post_actions.created_at < ?', 48.hours.ago).pluck(:id).count > 0
+
+          message = PendingFlagsMailer.notify
+          Email::Sender.new(message, :pending_flags_reminder).send
+      end
+    end
+
+  end
+
+end

app/mailers/pending_flags_mailer.rb

@@ -0,0 +1,30 @@
+require_dependency 'email/message_builder'
+require_dependency 'flag_query'
+
+class PendingFlagsMailer < ActionMailer::Base
+  include Email::BuildEmailHelper
+
+  def notify
+    return unless SiteSetting.contact_email
+
+    @posts, users = FlagQuery.flagged_posts_report(Discourse.system_user, 'active', 0, 20)
+
+    @posts.each do |post| # Note: post is a Hash, not a Post.
+      counts = flag_reason_counts(post)
+      post[:reason_counts] = counts.map do |reason, count|
+        "#{I18n.t('post_action_types.' + reason.to_s + '.title')}: #{count}"
+      end.join(', ')
+    end
+
+    @hours = SiteSetting.notify_about_flags_after
+
+    build_email( SiteSetting.contact_email,
+                 subject: "[#{SiteSetting.title}] " + I18n.t('flags_reminder.subject_template', {count: PostAction.flagged_posts_count}) )
+  end
+
+  private
+
+  def flag_reason_counts(post)
+    post[:post_actions].inject({}) {|h,v| h[v[:name_key]] ||= 0; h[v[:name_key]] += 1; h }
+  end
+end

app/views/pending_flags_mailer/notify.html.erb

@@ -0,0 +1,27 @@
+<p>
+  <%=t 'flags_reminder.flags_were_submitted', count: @hours %>
+  <a href="<%= Discourse.base_url + '/admin/flags/active' %>"><%=t 'flags_reminder.please_review' %></a>
+</p>
+
+<hr/>
+
+<table>
+  <tr>
+    <td></td>
+    <td><%=t 'flags_reminder.post_number' %></td>
+    <td></td>
+  </tr>
+  <% @posts.each do |post| %>
+  <tr>
+    <td><%= link_to post[:title], "#{Discourse.base_url}/t/#{post[:topic_slug]}/#{post[:topic_id]}/#{post[:post_number]}" %></td>
+    <td align="center"><%= post[:post_number] %></td>
+    <td><%= post[:reason_counts] %></td>
+  </tr>
+  <% end %>
+</table>
+
+<hr/>
+
+<p>
+  <%=t 'flags_reminder.how_to_disable' %>
+</p>

app/views/pending_flags_mailer/notify.text.erb

@@ -0,0 +1,9 @@
+<%=t 'flags_reminder.flags_were_submitted', count: @hours %> <%=t 'flags_reminder.please_review' %>
+
+<%= Discourse.base_url + '/admin/flags/active' %>
+
+<% @posts.each do |post| %>
+<%= post[:title] %>: <%=t 'flags_reminder.post_number' %> <%= post[:post_number] %> - <%= post[:reason_counts] %>
+<% end %>
+
+<%=t 'flags_reminder.how_to_disable' %>