Move map method to its own controller

[rails.git] / app / controllers / api / map_controller.rb

diff --git a/app/controllers/api/map_controller.rb b/app/controllers/api/map_controller.rb
new file mode 100644 (file)
index 0000000..47c0aeb
--- /dev/null
+++ b/app/controllers/api/map_controller.rb
@@ -0,0 +1,107 @@
+module Api
+  class MapController < ApplicationController
+    skip_before_action :verify_authenticity_token
+    before_action :api_deny_access_handler
+
+    authorize_resource :class => false
+
+    before_action :check_api_readable
+    around_action :api_call_handle_error, :api_call_timeout
+
+    # This is probably the most common call of all. It is used for getting the
+    # OSM data for a specified bounding box, usually for editing. First the
+    # bounding box (bbox) is checked to make sure that it is sane. All nodes
+    # are searched, then all the ways that reference those nodes are found.
+    # All Nodes that are referenced by those ways are fetched and added to the list
+    # of nodes.
+    # Then all the relations that reference the already found nodes and ways are
+    # fetched. All the nodes and ways that are referenced by those ways are then
+    # fetched. Finally all the xml is returned.
+    def index
+      # Figure out the bbox
+      # check boundary is sane and area within defined
+      # see /config/application.yml
+      begin
+        bbox = BoundingBox.from_bbox_params(params)
+        bbox.check_boundaries
+        bbox.check_size
+      rescue StandardError => err
+        report_error(err.message)
+        return
+      end
+
+      nodes = Node.bbox(bbox).where(:visible => true).includes(:node_tags).limit(MAX_NUMBER_OF_NODES + 1)
+
+      node_ids = nodes.collect(&:id)
+      if node_ids.length > MAX_NUMBER_OF_NODES
+        report_error("You requested too many nodes (limit is #{MAX_NUMBER_OF_NODES}). Either request a smaller area, or use planet.osm")
+        return
+      end
+
+      doc = OSM::API.new.get_xml_doc
+
+      # add bounds
+      doc.root << bbox.add_bounds_to(XML::Node.new("bounds"))
+
+      # get ways
+      # find which ways are needed
+      ways = []
+      if node_ids.empty?
+        list_of_way_nodes = []
+      else
+        way_nodes = WayNode.where(:node_id => node_ids)
+        way_ids = way_nodes.collect { |way_node| way_node.id[0] }
+        ways = Way.preload(:way_nodes, :way_tags).find(way_ids)
+
+        list_of_way_nodes = ways.collect do |way|
+          way.way_nodes.collect(&:node_id)
+        end
+        list_of_way_nodes.flatten!
+      end
+
+      # - [0] in case some thing links to node 0 which doesn't exist. Shouldn't actually ever happen but it does. FIXME: file a ticket for this
+      nodes_to_fetch = (list_of_way_nodes.uniq - node_ids) - [0]
+
+      nodes += Node.includes(:node_tags).find(nodes_to_fetch) unless nodes_to_fetch.empty?
+
+      visible_nodes = {}
+      changeset_cache = {}
+      user_display_name_cache = {}
+
+      nodes.each do |node|
+        if node.visible?
+          doc.root << node.to_xml_node(changeset_cache, user_display_name_cache)
+          visible_nodes[node.id] = node
+        end
+      end
+
+      way_ids = []
+      ways.each do |way|
+        if way.visible?
+          doc.root << way.to_xml_node(visible_nodes, changeset_cache, user_display_name_cache)
+          way_ids << way.id
+        end
+      end
+
+      relations = Relation.nodes(visible_nodes.keys).visible +
+                  Relation.ways(way_ids).visible
+
+      # we do not normally return the "other" partners referenced by an relation,
+      # e.g. if we return a way A that is referenced by relation X, and there's
+      # another way B also referenced, that is not returned. But we do make
+      # an exception for cases where an relation references another *relation*;
+      # in that case we return that as well (but we don't go recursive here)
+      relations += Relation.relations(relations.collect(&:id)).visible
+
+      # this "uniq" may be slightly inefficient; it may be better to first collect and output
+      # all node-related relations, then find the *not yet covered* way-related ones etc.
+      relations.uniq.each do |relation|
+        doc.root << relation.to_xml_node(changeset_cache, user_display_name_cache)
+      end
+
+      response.headers["Content-Disposition"] = "attachment; filename=\"map.osm\""
+
+      render :xml => doc.to_s
+    end
+  end
+end