116 lines
3.5 KiB
Ruby
116 lines
3.5 KiB
Ruby
class ApiController < ApplicationController
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before_filter :authorize
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after_filter :compress_output
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helper :user
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model :user
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#COUNT is the number of map requests to allow before exiting and stating a new process
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@@count = COUNT
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def authorize_web
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@current_user = User.find_by_token(session[:token])
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end
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# The maximum area you're allowed to request, in square degrees
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MAX_REQUEST_AREA = 0.25
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def map
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@@count+=1
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response.headers["Content-Type"] = 'text/xml'
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# Figure out the bbox
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bbox = params['bbox']
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unless bbox and bbox.count(',') == 3
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report_error("The parameter bbox is required, and must be of the form min_lon,min_lat,max_lon,max_lat")
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return
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end
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bbox = bbox.split(',')
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min_lon = bbox[0].to_f
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min_lat = bbox[1].to_f
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max_lon = bbox[2].to_f
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max_lat = bbox[3].to_f
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# check the bbox is sane
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unless min_lon <= max_lon
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report_error("The minimum longitude must be less than the maximum longitude, but it wasn't")
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return
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end
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unless min_lat <= max_lat
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report_error("The minimum latitude must be less than the maximum latitude, but it wasn't")
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return
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end
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unless min_lon >= -180 && min_lat >= -90 && max_lon <= 180 && max_lat <= 90
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report_error("The latitudes must be between -90 and 90, and longitudes between -180 and 180")
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return
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end
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# check the bbox isn't too large
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requested_area = (max_lat-min_lat)*(max_lon-min_lon)
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if requested_area > MAX_REQUEST_AREA
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report_error("The maximum bbox size is " + MAX_REQUEST_AREA.to_s + ", and your request was too large. Either request a smaller area, or use planet.osm")
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return
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end
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# get all the nodes
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nodes = Node.find(:all, :conditions => ['latitude > ? AND longitude > ? AND latitude < ? AND longitude < ? AND visible = 1', min_lat, min_lon, max_lat, max_lon])
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node_ids = nodes.collect {|node| node.id }
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# (in the future, we may wish to abort here if we found too many nodes)
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# grab the segments
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segments = Array.new
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if node_ids.length > 0
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node_ids_sql = "(#{node_ids.join(',')})"
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# get the referenced segments
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segments = Segment.find_by_sql "select * from current_segments where visible = 1 and (node_a in #{node_ids_sql} or node_b in #{node_ids_sql})"
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end
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# see if we have any missing nodes
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segments_nodes = segments.collect {|segment| segment.node_a }
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segments_nodes += segments.collect {|segment| segment.node_b }
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segments_nodes.uniq!
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missing_nodes = segments_nodes - node_ids
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# get missing nodes if there are any
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nodes += Node.find(missing_nodes) if missing_nodes.length > 0
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doc = OSM::API.new.get_xml_doc
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# get ways
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# find which ways are needed
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segment_ids = segments.collect {|segment| segment.id }
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ways = Array.new
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if segment_ids.length > 0
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way_segments = WaySegment.find_all_by_segment_id(segment_ids)
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way_ids = way_segments.collect {|way_segment| way_segment.id }
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ways = Way.find(way_ids) # NB: doesn't pick up segments, tags from db until accessed via way.way_segments etc.
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end
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nodes.each do |node|
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doc.root << node.to_xml_node()
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end
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segments.each do |segment|
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doc.root << segment.to_xml_node()
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end
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ways.each do |way|
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doc.root << way.to_xml_node()
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end
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#exit when we have too many requests
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if @@count > MAX_COUNT
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render :text => doc.to_s
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@@count = COUNT
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exit
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end
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render :text => doc.to_s
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end
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end
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