X-Git-Url: https://git.openstreetmap.org/rails.git/blobdiff_plain/5f8ab9e9244550b20b8d3bd97b3567df7020d06d..dc2a95903722644f6109244cec9a2d1e195fef0e:/app/controllers/changeset_controller.rb

diff --git a/app/controllers/changeset_controller.rb b/app/controllers/changeset_controller.rb
index 8668611eb..a24f61e28 100644
--- a/app/controllers/changeset_controller.rb
+++ b/app/controllers/changeset_controller.rb
@@ -2,6 +2,7 @@
 
 class ChangesetController < ApplicationController
   require 'xml/libxml'
+  require 'diff_reader'
 
   before_filter :authorize, :only => [:create, :update, :delete, :upload]
   before_filter :check_write_availability, :only => [:create, :update, :delete, :upload]
@@ -57,112 +58,50 @@ class ChangesetController < ApplicationController
   
   def close 
     begin
-      if not request.put?
+      unless request.put?
         render :nothing => true, :status => :method_not_allowed
         return
       end
       changeset = Changeset.find(params[:id])
       changeset.open = false
-      changeset.save
+      changeset.save!
       render :nothing => true
     rescue ActiveRecord::RecordNotFound
       render :nothing => true, :status => :not_found
     end
   end
 
+  ##
+  # Upload a diff in a single transaction.
+  #
+  # This means that each change within the diff must succeed, i.e: that
+  # each version number mentioned is still current. Otherwise the entire
+  # transaction *must* be rolled back.
+  #
+  # Furthermore, each element in the diff can only reference the current
+  # changeset.
+  #
+  # Returns: ??? the new document? updated diffs?
   def upload
-    if not request.put?
+    # only allow POST requests, as the upload method is most definitely
+    # not idempotent, as several uploads with placeholder IDs will have
+    # different side-effects.
+    # see http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.1.2
+    unless request.post?
       render :nothing => true, :status => :method_not_allowed
       return
     end
 
-    p = XML::Reader.new request.raw_post
-
-    node_ids, way_ids, rel_ids = {}, {}, {}
-    ids = {"node"=>node_ids, "way"=>way_ids, "relation"=>rel_ids}
-
-    models = {"node"=>Node, "way"=>Way, "relation"=>Relation}
-
-    res = XML::Document.new
-    res.encoding = 'UTF-8'
-    root = XML::Node.new 'osm'
-    root['version'] = '0.6'
-    root['creator'] = 'OpenStreetMap.org'
-    res.root = root
-
-    root << XML::Node.new_comment(" Warning: this is a 0.6 result document, " +
-      "not a normal OSM file. ")
-
+    changeset = Changeset.find(params[:id])
+    
+    diff_reader = DiffReader.new(request.raw_post, changeset)
     Changeset.transaction do
-      while p.read == 1
-	break if p.node_type == 15 # end element
-	next unless p.node_type == 1 # element
-
-	case p.name
-	when 'create':
-	  while p.read == 1
-	    break if p.node_type == 15 # end element
-	    next unless p.node_type == 1 # element
-
-	    model = models[p.name]
-	    next if model.nil?
-
-	    elem = XML::Node.new p.name
-	    nd = p.expand; p.next
-	    osm = model.from_xml_node(nd, true)
-	    elem['old_id'] = nd['id']
-
-	    case nd.name
-	    when 'way':
-	      fix_way(osm, node_ids)
-	      raise OSM::APIPreconditionFailedError.new if !osm.preconditions_ok?
-	    when 'relation':
-	      fix_rel(osm, ids)
-	      raise OSM::APIPreconditionFailedError.new if !osm.preconditions_ok?
-	    end
-
-	    create_prim ids[nd.name], osm, nd
-	    elem['new_id'] = osm.id.to_s
-	    elem['new_version'] = osm.version.to_s
-	    root << elem
-	  end
-	when 'modify':
-	  while p.read == 1
-	    break if p.node_type == 15 # end element
-	    next unless p.node_type == 1 # element
-
-	    model = models[p.name]
-	    next if model.nil?
-
-	    elem = XML::Node.new p.name
-	    new_osm = model.from_xml_node(p.expand); p.next
-	    osm = model.find(new_osm.id)
-	    osm.update_from new_osm, @user
-	    elem['old_id'] = elem['new_id'] = osm.id.to_s
-	    elem['new_version'] = osm.version.to_s
-	    root << elem
-	  end
-	when 'delete':
-	  while p.read == 1
-	    break if p.node_type == 15 # end element
-	    next unless p.node_type == 1 # element
-
-	    model = models[p.name]
-	    next if model.nil?
-
-	    elem = XML::Node.new p.name
-	    osm = model.find(p.expand['id']); p.next
-	    osm.delete_with_history(@user)
-	    elem['old_id'] = elem['new_id'] = osm.id.to_s
-	    elem['new_version'] = osm.version.to_s
-	    root << elem
-	  end
-	end
-      end
+      result = diff_reader.commit
+      render :text => result.to_s, :content_type => "text/xml"
     end
-
-    render :text => res.to_s, :content_type => "text/xml"
-
+    
+  rescue ActiveRecord::RecordNotFound
+    render :nothing => true, :status => :not_found
   rescue OSM::APIError => ex
     render ex.render_opts
   end