Added relation redaction logic, same as node and way logic, plus tests

app/controllers/old_relation_controller.rb

@@ -2,15 +2,28 @@ class OldRelationController < 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_relation, :except => [ :history ]
   after_filter :compress_output
   around_filter :api_call_handle_error, :api_call_timeout
 
   def history
-    relation = Relation.find(params[:id])
+    relation = Relation.find(params[:id].to_i)
+    
     doc = OSM::API.new.get_xml_doc
     
-    relation.old_relations.each do |old_relation|
+    visible_relations = if @user and @user.moderator? and params[:show_redactions] == "true"
+                          relation.old_relations
+                        else
+                          relation.old_relations.unredacted
+                        end
+    
+    visible_relations.each do |old_relation|
       doc.root << old_relation.to_xml_node
     end
     
@@ -18,15 +31,45 @@ class OldRelationController < ApplicationController
   end
   
   def version
-    if old_relation = OldRelation.where(:relation_id => params[:id], :version => params[:version]).first
-      response.last_modified = old_relation.timestamp
-
-      doc = OSM::API.new.get_xml_doc
-      doc.root << old_relation.to_xml_node
-
-      render :text => doc.to_s, :content_type => "text/xml"
+    if @old_relation.redacted? and not (@user and @user.moderator? and params[:show_redactions] == "true")
+      render :nothing => true, :status => :forbidden
     else
+
+      response.last_modified = @old_relation.timestamp
+      
+      doc = OSM::API.new.get_xml_doc
+      doc.root << @old_relation.to_xml_node
+        
+      render :text => doc.to_s, :content_type => "text/xml"
+    end
+  end
+
+  def redact
+    redaction_id = params['redaction']
+    unless redaction_id.nil?
+      # if a redaction ID was specified, then set this relation 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_relation.redact!(redaction)
+      
+    else
+      # if no redaction ID was provided, then this is an unredact
+      # operation.
+      @old_relation.redact!(nil)
+    end
+    
+    # just return an empty 200 OK for success
+    render :nothing => true
+  end
+
+  private
+  
+  def lookup_old_relation
+    @old_relation = OldRelation.where(:relation_id => params[:id], :version => params[:version]).first
+    if @old_relation.nil?
       render :nothing => true, :status => :not_found
+      return false
     end
   end
 end

app/models/old_relation.rb

@@ -1,10 +1,13 @@
 class OldRelation < ActiveRecord::Base
   include ConsistencyValidations
-  include Redactable
   
   self.table_name = "relations"
   self.primary_keys = "relation_id", "version"
 
+  # note this needs to be included after the table name changes, or
+  # the queries generated by Redactable will use the wrong table name.
+  include Redactable
+
   belongs_to :changeset
   belongs_to :redaction
   belongs_to :current_relation, :class_name => "Relation", :foreign_key => "relation_id"