Add link to unredacted element history for moderators

app/controllers/browse_controller.rb

@@ -6,6 +6,7 @@ class BrowseController < ApplicationController
   before_action -> { check_database_readable(:need_api => true) }
   before_action :require_oauth
   before_action :update_totp, :only => [:query]
+  before_action :require_moderator_for_unredacted_history, :only => [:relation_history, :way_history, :node_history]
   around_action :web_timeout
   authorize_resource :class => false
 
@@ -77,4 +78,10 @@ class BrowseController < ApplicationController
   end
 
   def query; end
+
+  private
+
+  def require_moderator_for_unredacted_history
+    deny_access(nil) if params[:show_redactions] && !current_user&.moderator?
+  end
 end

app/views/browse/feature.html.erb

@@ -18,6 +18,10 @@
     ·
   <% end %>
     <%= link_to t("browse.view_history"), :action => "#{@type}_history" %>
+  <% if current_user&.moderator? %>
+    &middot;
+    <%= link_to(t("browse.view_unredacted_history"), :action => "#{@type}_history", :params => { :show_redactions => true }) %>
+  <% end %>
   <% if @feature.version > 1 %>
     &middot;
     <%= link_to({ :controller => "old_#{@type.pluralize}", :action => :show, :version => @feature.version }, :class => "icon-link") do %>

app/views/browse/history.html.erb

@@ -8,4 +8,11 @@
   <%= link_to(t("browse.download_xml"), :controller => "api/old_#{@type.pluralize}", :action => "history") %>
   &middot;
   <%= link_to(t("browse.view_details"), :action => @type) %>
+  <% if params[:show_redactions] %>
+    &middot;
+    <%= link_to(t("browse.view_history"), :action => "#{@type}_history") %>
+  <% elsif current_user&.moderator? %>
+    &middot;
+    <%= link_to(t("browse.view_unredacted_history"), :action => "#{@type}_history", :params => { :show_redactions => true }) %>
+  <% end %>
 </div>