104 lines
3.7 KiB
Ruby
104 lines
3.7 KiB
Ruby
module Api
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class MapController < ApiController
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before_action :check_api_readable
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authorize_resource :class => false
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around_action :api_call_handle_error, :api_call_timeout
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before_action :set_request_formats
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# This is probably the most common call of all. It is used for getting the
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# OSM data for a specified bounding box, usually for editing. First the
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# bounding box (bbox) is checked to make sure that it is sane. All nodes
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# are searched, then all the ways that reference those nodes are found.
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# All Nodes that are referenced by those ways are fetched and added to the list
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# of nodes.
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# Then all the relations that reference the already found nodes and ways are
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# fetched. All the nodes and ways that are referenced by those ways are then
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# fetched. Finally all the xml is returned.
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def index
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# Figure out the bbox
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# check boundary is sane and area within defined
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# see /config/application.yml
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begin
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raise OSM::APIBadUserInput, "The parameter bbox is required" unless params[:bbox]
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@bounds = BoundingBox.from_bbox_params(params)
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@bounds.check_boundaries
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@bounds.check_size
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rescue StandardError => e
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report_error(e.message)
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return
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end
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nodes = Node.bbox(@bounds).where(:visible => true).includes(:node_tags).limit(Settings.max_number_of_nodes + 1)
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node_ids = nodes.collect(&:id)
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if node_ids.length > Settings.max_number_of_nodes
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report_error("You requested too many nodes (limit is #{Settings.max_number_of_nodes}). Either request a smaller area, or use planet.osm")
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return
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end
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# get ways
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# find which ways are needed
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ways = []
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if node_ids.empty?
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list_of_way_nodes = []
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else
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way_nodes = WayNode.where(:node_id => node_ids)
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way_ids = way_nodes.collect { |way_node| way_node.id[0] }
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ways = Way.preload(:way_nodes, :way_tags).find(way_ids)
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list_of_way_nodes = ways.collect do |way|
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way.way_nodes.collect(&:node_id)
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end
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list_of_way_nodes.flatten!
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end
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# - [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
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nodes_to_fetch = (list_of_way_nodes.uniq - node_ids) - [0]
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nodes += Node.includes(:node_tags).find(nodes_to_fetch) unless nodes_to_fetch.empty?
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visible_nodes = {}
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@nodes = []
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nodes.each do |node|
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if node.visible?
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visible_nodes[node.id] = node
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@nodes << node
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end
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end
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@ways = []
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way_ids = []
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ways.each do |way|
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if way.visible?
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way_ids << way.id
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@ways << way
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end
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end
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@relations = Relation.nodes(visible_nodes.keys).visible +
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Relation.ways(way_ids).visible
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# we do not normally return the "other" partners referenced by an relation,
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# e.g. if we return a way A that is referenced by relation X, and there's
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# another way B also referenced, that is not returned. But we do make
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# an exception for cases where an relation references another *relation*;
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# in that case we return that as well (but we don't go recursive here)
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@relations += Relation.relations(@relations.collect(&:id)).visible
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# this "uniq" may be slightly inefficient; it may be better to first collect and output
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# all node-related relations, then find the *not yet covered* way-related ones etc.
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@relations.uniq!
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response.headers["Content-Disposition"] = "attachment; filename=\"map.osm\""
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# Render the result
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respond_to do |format|
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format.xml
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format.json
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end
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end
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end
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end
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