-
- # - [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]
-
- if nodes_to_fetch.length > 0
- @nodes += Node.find(nodes_to_fetch, :include => :node_tags)
- end
-
- 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 = Array.new
- 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.find_for_nodes(visible_nodes.keys, :conditions => {:visible => true}) +
- Relation.find_for_ways(way_ids, :conditions => {:visible => true})
-
- # 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.find_for_relations(relations.collect { |r| r.id }, :conditions => {:visible => true})
-
- # 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(nil, changeset_cache, user_display_name_cache)
- end
-
- response.headers["Content-Disposition"] = "attachment; filename=\"map.osm\""
-
- render :text => doc.to_s, :content_type => "text/xml"
- end
-
- # Get a list of the tiles that have changed within a specified time
- # period
- def changes
- zoom = (params[:zoom] || '12').to_i
-
- if params.include?(:start) and params.include?(:end)
- starttime = Time.parse(params[:start])
- endtime = Time.parse(params[:end])
- else
- hours = (params[:hours] || '1').to_i.hours
- endtime = Time.now.getutc
- starttime = endtime - hours
- end
-
- if zoom >= 1 and zoom <= 16 and
- endtime > starttime and endtime - starttime <= 24.hours
- mask = (1 << zoom) - 1
-
- tiles = Node.count(:conditions => ["timestamp BETWEEN ? AND ?", starttime, endtime],
- :group => "maptile_for_point(latitude, longitude, #{zoom})")
-
- doc = OSM::API.new.get_xml_doc
- changes = XML::Node.new 'changes'
- changes["starttime"] = starttime.xmlschema
- changes["endtime"] = endtime.xmlschema
-
- tiles.each do |tile, count|
- x = (tile.to_i >> zoom) & mask
- y = tile.to_i & mask
-
- t = XML::Node.new 'tile'
- t["x"] = x.to_s
- t["y"] = y.to_s
- t["z"] = zoom.to_s
- t["changes"] = count.to_s
-
- changes << t
- end
-
- doc.root << changes
-
- render :text => doc.to_s, :content_type => "text/xml"
- else
- render :text => "Requested zoom is invalid, or the supplied start is after the end time, or the start duration is more than 24 hours", :status => :bad_request
- end
- end
-
- # External apps that use the api are able to query the api to find out some
- # parameters of the API. It currently returns:
- # * minimum and maximum API versions that can be used.
- # * maximum area that can be requested in a bbox request in square degrees
- # * number of tracepoints that are returned in each tracepoints page
- def capabilities
- doc = OSM::API.new.get_xml_doc
-
- api = XML::Node.new 'api'
- version = XML::Node.new 'version'
- version['minimum'] = "#{API_VERSION}";
- version['maximum'] = "#{API_VERSION}";
- api << version
- area = XML::Node.new 'area'
- area['maximum'] = APP_CONFIG['max_request_area'].to_s;
- api << area
- tracepoints = XML::Node.new 'tracepoints'
- tracepoints['per_page'] = APP_CONFIG['tracepoints_per_page'].to_s
- api << tracepoints
- waynodes = XML::Node.new 'waynodes'
- waynodes['maximum'] = APP_CONFIG['max_number_of_way_nodes'].to_s
- api << waynodes
- changesets = XML::Node.new 'changesets'
- changesets['maximum_elements'] = Changeset::MAX_ELEMENTS.to_s
- api << changesets
- timeout = XML::Node.new 'timeout'
- timeout['seconds'] = APP_CONFIG['api_timeout'].to_s
- api << timeout
-
- doc.root << api
-
- render :text => doc.to_s, :content_type => "text/xml"