1 class ApiController < ApplicationController
4 after_filter :compress_output
6 #COUNT is the number of map requests to allow before exiting and starting a new process
9 # The maximum area you're allowed to request, in square degrees
10 MAX_REQUEST_AREA = 0.25
13 # Number of GPS trace/trackpoints returned per-page
14 TRACEPOINTS_PER_PAGE = 5000
18 #retrieve the page number
19 page = params['page'].to_i
25 report_error("Page number must be greater than or equal to 0")
29 offset = page * TRACEPOINTS_PER_PAGE
33 unless bbox and bbox.count(',') == 3
34 report_error("The parameter bbox is required, and must be of the form min_lon,min_lat,max_lon,max_lat")
38 bbox = bbox.split(',')
40 min_lon = bbox[0].to_f
41 min_lat = bbox[1].to_f
42 max_lon = bbox[2].to_f
43 max_lat = bbox[3].to_f
45 # check the bbox is sane
46 unless min_lon <= max_lon
47 report_error("The minimum longitude must be less than the maximum longitude, but it wasn't")
50 unless min_lat <= max_lat
51 report_error("The minimum latitude must be less than the maximum latitude, but it wasn't")
54 unless min_lon >= -180 && min_lat >= -90 && max_lon <= 180 && max_lat <= 90
55 report_error("The latitudes must be between -90 and 90, and longitudes between -180 and 180")
59 # check the bbox isn't too large
60 requested_area = (max_lat-min_lat)*(max_lon-min_lon)
61 if requested_area > MAX_REQUEST_AREA
62 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")
67 points = Tracepoint.find_by_area(min_lat, min_lon, max_lat, max_lon, :offset => offset, :limit => TRACEPOINTS_PER_PAGE, :order => "timestamp DESC" )
69 doc = XML::Document.new
70 doc.encoding = 'UTF-8'
71 root = XML::Node.new 'gpx'
72 root['version'] = '1.0'
73 root['creator'] = 'OpenStreetMap.org'
74 root['xmlns'] = "http://www.topografix.com/GPX/1/0/"
78 track = XML::Node.new 'trk'
81 trkseg = XML::Node.new 'trkseg'
84 points.each do |point|
85 trkseg << point.to_xml_node()
88 #exit when we have too many requests
89 if @@count > MAX_COUNT
90 render :text => doc.to_s, :content_type => "text/xml"
95 render :text => doc.to_s, :content_type => "text/xml"
103 # Figure out the bbox
104 bbox = params['bbox']
105 unless bbox and bbox.count(',') == 3
106 report_error("The parameter bbox is required, and must be of the form min_lon,min_lat,max_lon,max_lat")
110 bbox = bbox.split(',')
112 min_lon = bbox[0].to_f
113 min_lat = bbox[1].to_f
114 max_lon = bbox[2].to_f
115 max_lat = bbox[3].to_f
117 # check the bbox is sane
118 unless min_lon <= max_lon
119 report_error("The minimum longitude must be less than the maximum longitude, but it wasn't")
122 unless min_lat <= max_lat
123 report_error("The minimum latitude must be less than the maximum latitude, but it wasn't")
126 unless min_lon >= -180 && min_lat >= -90 && max_lon <= 180 && max_lat <= 90
127 report_error("The latitudes must be between -90 and 90, and longitudes between -180 and 180")
131 # check the bbox isn't too large
132 requested_area = (max_lat-min_lat)*(max_lon-min_lon)
133 if requested_area > MAX_REQUEST_AREA
134 report_error("The maximum bbox size is " + MAX_REQUEST_AREA.to_s +
135 ", and your request was too large. Either request a smaller area, or use planet.osm")
140 nodes = Node.find(:all, :conditions => ['latitude BETWEEN ? AND ? AND longitude BETWEEN ? AND ? AND visible = 1', min_lat, max_lat, min_lon, max_lon])
142 node_ids = nodes.collect {|node| node.id }
144 if node_ids.length > 50_000
145 report_error("You requested too many nodes (limit is 50,000). Either request a smaller area, or use planet.osm")
149 if node_ids.length == 0
150 render :text => "<osm version='0.5'></osm>", :content_type => "text/xml"
154 relations = Array.new
156 doc = OSM::API.new.get_xml_doc
159 # find which ways are needed
161 if node_ids.length > 0
162 way_nodes = WayNode.find_all_by_node_id(node_ids)
163 way_ids = way_nodes.collect {|way_node| way_node.id }
164 ways = Way.find(way_ids)
166 list_of_way_nodes = ways.collect { |way|
167 way.way_nodes.collect { |way_node| way_node.node_id }
169 list_of_way_nodes.flatten!
172 list_of_way_nodes = Array.new
175 # - [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
176 nodes_to_fetch = (list_of_way_nodes.uniq - node_ids) - [0]
178 if nodes_to_fetch.length > 0
179 nodes += Node.find(nodes_to_fetch)
183 user_display_name_cache = {}
187 doc.root << node.to_xml_node(user_display_name_cache)
188 visible_nodes[node.id] = node
195 doc.root << way.to_xml_node(visible_nodes, user_display_name_cache)
200 # collect relationships. currently done in one big block at the end;
201 # may need to move this upwards if people want automatic completion of
202 # relationships, i.e. deliver referenced objects like we do with ways...
203 relations = Relation.find_by_sql("select e.* from current_relations e,current_relation_members em where " +
205 "em.id = e.id and em.member_type='node' and em.member_id in (#{visible_nodes.keys.join(',')})")
206 relations += Relation.find_by_sql("select e.* from current_relations e,current_relation_members em where " +
208 "em.id = e.id and em.member_type='way' and em.member_id in (#{way_ids.join(',')})")
209 # we do not normally return the "other" partners referenced by an relation,
210 # e.g. if we return a way A that is referenced by relation X, and there's
211 # another way B also referenced, that is not returned. But we do make
212 # an exception for cases where an relation references another *relation*;
213 # in that case we return that as well (but we don't go recursive here)
214 relation_ids = relations.collect { |relation| relation.id }
215 if relation_ids.length > 0
216 relations += Relation.find_by_sql("select e.* from current_relations e,current_relation_members em where " +
218 "em.id = e.id and em.member_type='relation' and em.member_id in (#{relation_ids.join(',')})")
221 # this "uniq" may be slightly inefficient; it may be better to first collect and output
222 # all node-related relations, then find the *not yet covered* way-related ones etc.
223 relations.uniq.each do |relation|
224 doc.root << relation.to_xml_node(user_display_name_cache)
227 render :text => doc.to_s, :content_type => "text/xml"
229 #exit when we have too many requests
230 if @@count > MAX_COUNT
238 doc = OSM::API.new.get_xml_doc
240 api = XML::Node.new 'api'
241 version = XML::Node.new 'version'
242 version['minimum'] = '0.5';
243 version['maximum'] = '0.5';
245 area = XML::Node.new 'area'
246 area['maximum'] = MAX_REQUEST_AREA.to_s;
251 render :text => doc.to_s, :content_type => "text/xml"