Add support for accessing changesets as XML through the API via the

[rails.git] / app / controllers / changeset_controller.rb

diff --git a/app/controllers/changeset_controller.rb b/app/controllers/changeset_controller.rb
index 1041c74692eaf09d17b07dff3edc8f0da68e79f4..3e88eeec32b0425b10ca47c92cc90b057814b8fe 100644 (file)
--- a/app/controllers/changeset_controller.rb
+++ b/app/controllers/changeset_controller.rb
@@ -3,9 +3,10 @@
 class ChangesetController < ApplicationController
   require 'xml/libxml'
 
-  before_filter :authorize, :only => [:create, :update, :delete]
-  before_filter :check_write_availability, :only => [:create, :update, :delete]
-  before_filter :check_read_availability, :except => [:create, :update, :delete]
+  before_filter :authorize, :only => [:create, :update, :delete, :upload]
+  before_filter :check_write_availability, :only => [:create, :update, :delete, :upload]
+  before_filter :check_read_availability, :except => [:create, :update, :delete, :upload]
+  after_filter :compress_output
 
   # Create a changeset from XML.
   def create
@@ -23,4 +24,150 @@ class ChangesetController < ApplicationController
       render :nothing => true, :status => :method_not_allowed
     end
   end
+
+  def create_prim(ids, prim, nd)
+    prim.version = 0
+    prim.user_id = @user.id
+    prim.visible = true
+    prim.save_with_history!
+
+    ids[nd['id'].to_i] = prim.id
+  end
+
+  def fix_way(w, node_ids)
+    w.nds = w.instance_eval { @nds }.
+      map { |nd| node_ids[nd] || nd }
+    return w
+  end
+
+  def fix_rel(r, ids)
+    r.members = r.instance_eval { @members }.
+      map { |memb| [memb[0], ids[memb[0]][memb[1].to_i] || memb[1], memb[2]] }
+    return r
+  end
+  
+  def read
+    begin
+      changeset = Changeset.find(params[:id])
+      render :text => changeset.to_xml.to_s, :content_type => "text/xml"
+    rescue ActiveRecord::RecordNotFound
+      render :nothing => true, :status => :not_found
+    end
+  end
+
+  def upload
+    if not request.put?
+      render :nothing => true, :status => :method_not_allowed
+      return
+    end
+
+    # FIXME: this should really be done without loading the whole XML file
+    # into memory.
+    p = XML::Parser.new
+    p.string  = request.raw_post
+    doc = p.parse
+
+    node_ids, way_ids, rel_ids = {}, {}, {}
+    ids = {"node"=>node_ids, "way"=>way_ids, "relation"=>rel_ids}
+
+    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.transaction do
+      doc.find('//osm/create/node').each do |nd|
+       elem = XML::Node.new 'node'
+       node = Node.from_xml_node(nd, true)
+       elem['old_id'] = nd['id']
+       create_prim node_ids, node, nd
+       elem['new_id'] = node.id.to_s
+       elem['new_version'] = node.version.to_s
+       root << elem
+      end
+      doc.find('//osm/create/way').each do |nd|
+       elem = XML::Node.new 'way'
+       way = Way.from_xml_node(nd, true)
+       elem['old_id'] = nd['id']
+       fix_way(way, node_ids)
+       raise OSM::APIPreconditionFailedError.new if !way.preconditions_ok?
+       create_prim way_ids, way, nd
+       elem['new_id'] = way.id.to_s
+       elem['new_version'] = way.version.to_s
+       root << elem
+      end
+      doc.find('//osm/create/relation').each do |nd|
+       elem = XML::Node.new 'relation'
+       relation = Relation.from_xml_node(nd, true)
+       elem['old_id'] = nd['id']
+       fix_rel(relation, ids)
+       raise OSM::APIPreconditionFailedError.new if !relation.preconditions_ok?
+       create_prim rel_ids, relation, nd
+       elem['new_id'] = relation.id.to_s
+       elem['new_version'] = relation.version.to_s
+       root << elem
+      end
+
+      doc.find('//osm/modify/relation').each do |nd|
+       elem = XML::Node.new 'relation'
+       new_relation = Relation.from_xml_node(nd)
+       relation = Relation.find(new_relation.id)
+       relation.update_from new_relation, @user
+       elem['old_id'] = elem['new_id'] = relation.id.to_s
+       elem['new_version'] = relation.version.to_s
+       root << elem
+      end
+      doc.find('//osm/modify/way').each do |nd|
+       elem = XML::Node.new 'way'
+       new_way = Way.from_xml_node(nd)
+       way = Way.find(new_way.id)
+       way.update_from new_way, @user
+       elem['old_id'] = elem['new_id'] = way.id.to_s
+       elem['new_version'] = way.version.to_s
+       root << elem
+      end
+      doc.find('//osm/modify/node').each do |nd|
+       elem = XML::Node.new 'node'
+       new_node = Node.from_xml_node(nd)
+       node = Node.find(new_node.id)
+       node.update_from new_node, @user
+       elem['old_id'] = elem['new_id'] = node.id.to_s
+       elem['new_version'] = node.version.to_s
+       root << elem
+      end
+
+      doc.find('//osm/delete/relation').each do |nd|
+       elem = XML::Node.new 'relation'
+       relation = Relation.find(nd['id'])
+       relation.delete_with_history(@user)
+       elem['old_id'] = elem['new_id'] = relation.id.to_s
+       elem['new_version'] = relation.version.to_s
+       root << elem
+      end
+      doc.find('//osm/delete/way').each do |nd|
+       elem = XML::Node.new 'way'
+       way = Way.find(nd['id'])
+       way.delete_with_relations_and_history(@user)
+       elem['old_id'] = elem['new_id'] = way.id.to_s
+       elem['new_version'] = way.version.to_s
+       root << elem
+      end
+      doc.find('//osm/delete/node').each do |nd|
+       elem = XML::Node.new 'node'
+       new_node = Node.from_xml_node(nd)
+       node = Node.find(nd['id'])
+       node.delete_with_history(@user)
+       elem['old_id'] = elem['new_id'] = node.id.to_s
+       elem['new_version'] = node.version.to_s
+       root << elem
+      end
+    end
+
+    render :text => res.to_s, :content_type => "text/xml"
+  end
 end