1 class ApiController < ApplicationController
3 after_filter :compress_output
5 #COUNT is the number of map requests to allow before exiting and starting a new process
8 # The maximum area you're allowed to request, in square degrees
9 MAX_REQUEST_AREA = 0.25
12 # Number of GPS trace/trackpoints returned per-page
13 TRACEPOINTS_PER_PAGE = 5000
17 #retrieve the page number
18 page = params['page'].to_i
24 report_error("Page number must be greater than or equal to 0")
28 offset = page * TRACEPOINTS_PER_PAGE
32 unless bbox and bbox.count(',') == 3
33 report_error("The parameter bbox is required, and must be of the form min_lon,min_lat,max_lon,max_lat")
37 bbox = bbox.split(',')
39 min_lon = bbox[0].to_f
40 min_lat = bbox[1].to_f
41 max_lon = bbox[2].to_f
42 max_lat = bbox[3].to_f
44 # check the bbox is sane
45 unless min_lon <= max_lon
46 report_error("The minimum longitude must be less than the maximum longitude, but it wasn't")
49 unless min_lat <= max_lat
50 report_error("The minimum latitude must be less than the maximum latitude, but it wasn't")
53 unless min_lon >= -180 && min_lat >= -90 && max_lon <= 180 && max_lat <= 90
54 report_error("The latitudes must be between -90 and 90, and longitudes between -180 and 180")
58 # check the bbox isn't too large
59 requested_area = (max_lat-min_lat)*(max_lon-min_lon)
60 if requested_area > MAX_REQUEST_AREA
61 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")
66 min_lat = min_lat * 1000000
67 max_lat = max_lat * 1000000
68 min_lon = min_lon * 1000000
69 max_lon = max_lon * 1000000
71 points = Tracepoint.find(:all, :conditions => ['latitude BETWEEN ? AND ? AND longitude BETWEEN ? AND ?', min_lat.to_i, max_lat.to_i, min_lon.to_i, max_lon.to_i], :select => "DISTINCT *", :offset => offset, :limit => TRACEPOINTS_PER_PAGE, :order => "timestamp DESC" )
73 doc = XML::Document.new
74 doc.encoding = 'UTF-8'
75 root = XML::Node.new 'gpx'
76 root['version'] = '1.0'
77 root['creator'] = 'OpenStreetMap.org'
78 root['xmlns'] = "http://www.topografix.com/GPX/1/0/"
82 track = XML::Node.new 'trk'
85 trkseg = XML::Node.new 'trkseg'
88 points.each do |point|
89 trkseg << point.to_xml_node()
92 #exit when we have too many requests
93 if @@count > MAX_COUNT
94 render :text => doc.to_s, :content_type => "text/xml"
99 render :text => doc.to_s, :content_type => "text/xml"
107 # Figure out the bbox
108 bbox = params['bbox']
109 unless bbox and bbox.count(',') == 3
110 report_error("The parameter bbox is required, and must be of the form min_lon,min_lat,max_lon,max_lat")
114 bbox = bbox.split(',')
116 min_lon = bbox[0].to_f
117 min_lat = bbox[1].to_f
118 max_lon = bbox[2].to_f
119 max_lat = bbox[3].to_f
121 # check the bbox is sane
122 unless min_lon <= max_lon
123 report_error("The minimum longitude must be less than the maximum longitude, but it wasn't")
126 unless min_lat <= max_lat
127 report_error("The minimum latitude must be less than the maximum latitude, but it wasn't")
130 unless min_lon >= -180 && min_lat >= -90 && max_lon <= 180 && max_lat <= 90
131 report_error("The latitudes must be between -90 and 90, and longitudes between -180 and 180")
135 # check the bbox isn't too large
136 requested_area = (max_lat-min_lat)*(max_lon-min_lon)
137 if requested_area > MAX_REQUEST_AREA
138 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")
143 nodes = Node.find(:all, :conditions => ['latitude > ? AND longitude > ? AND latitude < ? AND longitude < ? AND visible = 1', min_lat, min_lon, max_lat, max_lon])
145 node_ids = nodes.collect {|node| node.id }
147 if node_ids.length > 50_000
148 report_error("You requested too many nodes (limit is 50,000). Either request a smaller area, or use planet.osm")
152 if node_ids.length == 0
153 render :text => "<osm version='0.4'></osm>", :content_type => "text/xml"
159 if node_ids.length > 0
160 node_ids_sql = "(#{node_ids.join(',')})"
161 # get the referenced segments
162 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})"
164 # see if we have any missing nodes
165 segments_nodes = segments.collect {|segment| segment.node_a }
166 segments_nodes += segments.collect {|segment| segment.node_b }
170 missing_nodes = segments_nodes - node_ids
172 # get missing nodes if there are any
173 nodes += Node.find(missing_nodes) if missing_nodes.length > 0
175 doc = OSM::API.new.get_xml_doc
178 # find which ways are needed
179 segment_ids = segments.collect {|segment| segment.id }
181 if segment_ids.length > 0
182 way_segments = WaySegment.find_all_by_segment_id(segment_ids)
183 way_ids = way_segments.collect {|way_segment| way_segment.id }
184 ways = Way.find(way_ids) # NB: doesn't pick up segments, tags from db until accessed via way.way_segments etc.
186 # seg_ids = way_segments.collect {|way_segment| way_segment.segment_id }
188 list_of_way_segs = ways.collect {|way| way.way_segments}
189 list_of_way_segs.flatten!
191 list_of_way_segments = list_of_way_segs.collect { |way_seg| way_seg.segment_id }
194 list_of_way_segments = Array.new
197 # - [0] in case some thing links to segment 0 which doesn't exist. Shouldn't actually ever happen but it does. FIXME: file a ticket for this
198 segments_to_fetch = (list_of_way_segments.uniq - segment_ids) - [0]
200 if segments_to_fetch.length > 0
201 segments += Segment.find(segments_to_fetch)
207 segments_nodes = segments.collect {|segment| segment.node_a }
208 segments_nodes += segments.collect {|segment| segment.node_b }
210 node_ids_a = nodes.collect {|node| node.id }
212 nodes_to_get = segments_nodes - node_ids_a
213 nodes += Node.find(nodes_to_get) if nodes_to_get.length > 0
216 user_display_name_cache = {}
220 doc.root << node.to_xml_node(user_display_name_cache)
221 visible_nodes[node.id] = node
225 visible_segments = {}
227 segments.each do |segment|
228 if visible_nodes[segment.node_a] and visible_nodes[segment.node_b] and segment.visible?
229 doc.root << segment.to_xml_node(user_display_name_cache)
230 visible_segments[segment.id] = segment
235 doc.root << way.to_xml_node(visible_segments, user_display_name_cache) if way.visible?
238 render :text => doc.to_s, :content_type => "text/xml"
240 #exit when we have too many requests
241 if @@count > MAX_COUNT