add basic support for safe mode

app/logical/current_user.rb

@@ -42,6 +42,18 @@ class CurrentUser
     user.name
   end
 
+  def self.safe_mode?
+    Thread.current[:safe_mode]
+  end
+
+  def self.set_safe_mode(req)
+    if req.host =~ /safe/
+      Thread.current[:safe_mode] = true
+    else
+      Thread.current[:safe_mode] = false
+    end
+  end
+
   def self.method_missing(method, *params, &block)
     if user.respond_to?(method)
       user.__send__(method, *params, &block)

app/logical/post_query_builder.rb

@@ -112,6 +112,11 @@ class PostQueryBuilder
       raise ::Post::SearchError.new("You cannot search for more than #{Danbooru.config.tag_query_limit} tags at a time")
     end
 
+    if CurrentUser.safe_mode?
+      relation = relation.where(:rating => "s")
+      relation = relation.where("created_at <= ?", 3.months.ago)
+    end
+
     relation = add_range_relation(q[:post_id], "posts.id", relation)
     relation = add_range_relation(q[:mpixels], "posts.image_width * posts.image_height / 1000000.0", relation)
     relation = add_range_relation(q[:width], "posts.image_width", relation)