Fixing review comments

Added scoping for unredacted items, cleaned up authorization and
railsified old_node_controller.

app/controllers/application_controller.rb

@@ -160,6 +160,18 @@ class ApplicationController < ActionController::Base
     end 
   end 
 
+  ##
+  # to be used as a before_filter *after* authorize. this checks that
+  # the user is a moderator and, if not, returns a forbidden error.
+  #
+  def authorize_moderator(errormessage="Access restricted to moderators") 
+    # check user is a moderator
+    unless @user.moderator?
+      render :text => errormessage, :status => :forbidden
+      return false
+    end 
+  end 
+
   def check_database_readable(need_api = false)
     if STATUS == :database_offline or (need_api and STATUS == :api_offline)
       redirect_to :controller => 'site', :action => 'offline'

app/controllers/old_node_controller.rb

@@ -2,59 +2,77 @@ class OldNodeController < ApplicationController
   require 'xml/libxml'
 
   skip_before_filter :verify_authenticity_token
+  before_filter :setup_user_auth, :only => [ :history, :version ]
   before_filter :authorize, :only => [ :redact ]
+  before_filter :authorize_moderator, :only => [ :redact ]
   before_filter :require_allow_write_api, :only => [ :redact ]
   before_filter :check_api_readable
   before_filter :check_api_writable, :only => [ :redact ]
+  before_filter :lookup_old_node, :except => [ :history ]
   after_filter :compress_output
   around_filter :api_call_handle_error, :api_call_timeout
 
   def history
-    # TODO - maybe a bit heavyweight to do this on every
-    # call, perhaps try lazy auth.
-    setup_user_auth
-
     node = Node.find(params[:id].to_i)
     
     doc = OSM::API.new.get_xml_doc
     
-    node.old_nodes.each do |old_node|
-      unless old_node.redacted? and (@user.nil? or not @user.moderator?)
-        doc.root << old_node.to_xml_node
-      end
+    visible_nodes = if @user and @user.moderator?
+                      node.old_nodes
+                    else
+                      node.old_nodes.unredacted
+                    end
+
+    visible_nodes.each do |old_node|
+      doc.root << old_node.to_xml_node
     end
     
     render :text => doc.to_s, :content_type => "text/xml"
   end
   
   def version
-    if old_node = OldNode.where(:node_id => params[:id], :version => params[:version]).first
-      # TODO - maybe a bit heavyweight to do this on every
-      # call, perhaps try lazy auth.
-      setup_user_auth
-      
-      if old_node.redacted? and (@user.nil? or not @user.moderator?)
-        render :nothing => true, :status => :forbidden
-      else
-
-        response.last_modified = old_node.timestamp
-        
-        doc = OSM::API.new.get_xml_doc
-        doc.root << old_node.to_xml_node
-        
-        render :text => doc.to_s, :content_type => "text/xml"
-      end
+    if @old_node.redacted? and (@user.nil? or not @user.moderator?)
+      render :nothing => true, :status => :forbidden
     else
-      render :nothing => true, :status => :not_found
+
+      response.last_modified = @old_node.timestamp
+      
+      doc = OSM::API.new.get_xml_doc
+      doc.root << @old_node.to_xml_node
+        
+      render :text => doc.to_s, :content_type => "text/xml"
     end
   end
 
   def redact
-    if @user && @user.moderator?
-      render :nothing => true
-
+    redaction_id = params['redaction']
+    unless redaction_id.nil?
+      # if a redaction ID was specified, then set this node to
+      # be redacted in that redaction. (TODO: check that the
+      # user doing the redaction owns the redaction object too)
+      redaction = Redaction.find(redaction_id.to_i)
+      @old_node.redact!(redaction)
+      
     else
-      render :nothing => true, :status => :forbidden
+      # if no redaction ID was provided, then this is an unredact
+      # operation.
+      @old_node.redact!(nil)
+    end
+    
+    # just return an empty 200 OK for success
+    render :nothing => true
+  end
+
+  private
+  
+  def lookup_old_node
+    @old_node = OldNode.where(:node_id => params[:id], :version => params[:version]).first
+    if @old_node.nil?
+      # i want to do this
+      #raise OSM::APINotFoundError.new
+      # but i get errors, so i'm getting very fed up and doing this instead
+      render :nothing => true, :status => :not_found
+      return false
     end
   end
 end