source: subversion/sites/rails_port_branches/api06/app/controllers/api_controller.rb @ 10902

Last change on this file since 10902 was 10902, checked in by smsm1, 6 years ago

Doing a resync from mainline 8633:10895. There was one simple to resolve conflict on app/models/node.rb. Also moving the migrations for API0.6 to new sequence numbers since there was some new migrations added to mainline, where the migration numbers would conflict if not moved.

File size: 7.8 KB
Line 
1class ApiController < ApplicationController
2
3  session :off
4  before_filter :check_read_availability, :except => [:capabilities]
5  after_filter :compress_output
6
7  # Help methods for checking boundary sanity and area size
8  include MapBoundary
9
10  #COUNT is the number of map requests to allow before exiting and starting a new process
11  @@count = COUNT
12
13  # The maximum area you're allowed to request, in square degrees
14  MAX_REQUEST_AREA = 0.25
15
16  # Number of GPS trace/trackpoints returned per-page
17  TRACEPOINTS_PER_PAGE = 5000
18
19 
20  def trackpoints
21    @@count+=1
22    #retrieve the page number
23    page = params['page'].to_i
24    unless page
25        page = 0;
26    end
27
28    unless page >= 0
29        report_error("Page number must be greater than or equal to 0")
30        return
31    end
32
33    offset = page * TRACEPOINTS_PER_PAGE
34
35    # Figure out the bbox
36    bbox = params['bbox']
37    unless bbox and bbox.count(',') == 3
38      report_error("The parameter bbox is required, and must be of the form min_lon,min_lat,max_lon,max_lat")
39      return
40    end
41
42    bbox = bbox.split(',')
43    min_lon, min_lat, max_lon, max_lat = sanitise_boundaries(bbox)
44    # check boundary is sane and area within defined
45    # see /config/application.yml
46    begin
47      check_boundaries(min_lon, min_lat, max_lon, max_lat)
48    rescue Exception => err
49      report_error(err.message)
50      return
51    end
52
53    # get all the points
54    points = Tracepoint.find_by_area(min_lat, min_lon, max_lat, max_lon, :offset => offset, :limit => TRACEPOINTS_PER_PAGE, :order => "timestamp DESC" )
55
56    doc = XML::Document.new
57    doc.encoding = 'UTF-8'
58    root = XML::Node.new 'gpx'
59    root['version'] = '1.0'
60    root['creator'] = 'OpenStreetMap.org'
61    root['xmlns'] = "http://www.topografix.com/GPX/1/0/"
62   
63    doc.root = root
64
65    track = XML::Node.new 'trk'
66    doc.root << track
67
68    trkseg = XML::Node.new 'trkseg'
69    track << trkseg
70
71    points.each do |point|
72      trkseg << point.to_xml_node()
73    end
74
75    #exit when we have too many requests
76    if @@count > MAX_COUNT
77      render :text => doc.to_s, :content_type => "text/xml"
78      @@count = COUNT
79      exit!
80    end
81
82    response.headers["Content-Disposition"] = "attachment; filename=\"map.osm\""
83
84    render :text => doc.to_s, :content_type => "text/xml"
85  end
86
87  def map
88    GC.start
89    @@count+=1
90    # Figure out the bbox
91    bbox = params['bbox']
92
93    unless bbox and bbox.count(',') == 3
94      # alternatively: report_error(TEXT['boundary_parameter_required']
95      report_error("The parameter bbox is required, and must be of the form min_lon,min_lat,max_lon,max_lat")
96      return
97    end
98
99    bbox = bbox.split(',')
100
101    min_lon, min_lat, max_lon, max_lat = sanitise_boundaries(bbox)
102
103    # check boundary is sane and area within defined
104    # see /config/application.yml
105    begin
106      check_boundaries(min_lon, min_lat, max_lon, max_lat)
107    rescue Exception => err
108      report_error(err.message)
109      return
110    end
111
112    @nodes = Node.find_by_area(min_lat, min_lon, max_lat, max_lon, :conditions => "visible = 1", :limit => APP_CONFIG['max_number_of_nodes']+1)
113    # get all the nodes, by tag not yet working, waiting for change from NickB
114    # need to be @nodes (instance var) so tests in /spec can be performed
115    #@nodes = Node.search(bbox, params[:tag])
116
117    node_ids = @nodes.collect(&:id)
118    if node_ids.length > APP_CONFIG['max_number_of_nodes']
119      report_error("You requested too many nodes (limit is 50,000). Either request a smaller area, or use planet.osm")
120      return
121    end
122    if node_ids.length == 0
123      render :text => "<osm version='#{API_VERSION}'></osm>", :content_type => "text/xml"
124      return
125    end
126
127    doc = OSM::API.new.get_xml_doc
128
129    # add bounds
130    bounds = XML::Node.new 'bounds'
131    bounds['minlat'] = min_lat.to_s
132    bounds['minlon'] = min_lon.to_s
133    bounds['maxlat'] = max_lat.to_s
134    bounds['maxlon'] = max_lon.to_s
135    doc.root << bounds
136
137    # get ways
138    # find which ways are needed
139    ways = Array.new
140    if node_ids.length > 0
141      way_nodes = WayNode.find_all_by_node_id(node_ids)
142      way_ids = way_nodes.collect { |way_node| way_node.id[0] }
143      ways = Way.find(way_ids)
144
145      list_of_way_nodes = ways.collect { |way|
146        way.way_nodes.collect { |way_node| way_node.node_id }
147      }
148      list_of_way_nodes.flatten!
149
150    else
151      list_of_way_nodes = Array.new
152    end
153
154    # - [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
155    nodes_to_fetch = (list_of_way_nodes.uniq - node_ids) - [0]
156
157    if nodes_to_fetch.length > 0
158      @nodes += Node.find(nodes_to_fetch)
159    end
160
161    visible_nodes = {}
162    user_display_name_cache = {}
163
164    @nodes.each do |node|
165      if node.visible?
166        doc.root << node.to_xml_node(user_display_name_cache)
167        visible_nodes[node.id] = node
168      end
169    end
170
171    way_ids = Array.new
172    ways.each do |way|
173      if way.visible?
174        doc.root << way.to_xml_node(visible_nodes, user_display_name_cache)
175        way_ids << way.id
176      end
177    end 
178
179    relations = Relation.find_for_nodes(visible_nodes.keys, :conditions => "visible = 1") +
180                Relation.find_for_ways(way_ids, :conditions => "visible = 1")
181
182    # we do not normally return the "other" partners referenced by an relation,
183    # e.g. if we return a way A that is referenced by relation X, and there's
184    # another way B also referenced, that is not returned. But we do make
185    # an exception for cases where an relation references another *relation*;
186    # in that case we return that as well (but we don't go recursive here)
187    relations += Relation.find_for_relations(relations.collect { |r| r.id }, :conditions => "visible = 1")
188
189    # this "uniq" may be slightly inefficient; it may be better to first collect and output
190    # all node-related relations, then find the *not yet covered* way-related ones etc.
191    relations.uniq.each do |relation|
192      doc.root << relation.to_xml_node(user_display_name_cache)
193    end
194
195    response.headers["Content-Disposition"] = "attachment; filename=\"map.osm\""
196
197    render :text => doc.to_s, :content_type => "text/xml"
198   
199    #exit when we have too many requests
200    if @@count > MAX_COUNT
201      @@count = COUNT
202     
203      exit!
204    end
205  end
206
207  def changes
208    zoom = (params[:zoom] || '12').to_i
209
210    if params.include?(:start) and params.include?(:end)
211      starttime = Time.parse(params[:start])
212      endtime = Time.parse(params[:end])
213    else
214      hours = (params[:hours] || '1').to_i.hours
215      endtime = Time.now
216      starttime = endtime - hours
217    end
218
219    if zoom >= 1 and zoom <= 16 and
220       endtime >= starttime and endtime - starttime <= 24.hours
221      mask = (1 << zoom) - 1
222
223      tiles = Node.count(:conditions => ["timestamp BETWEEN ? AND ?", starttime, endtime],
224                         :group => "maptile_for_point(latitude, longitude, #{zoom})")
225
226      doc = OSM::API.new.get_xml_doc
227      changes = XML::Node.new 'changes'
228      changes["starttime"] = starttime.xmlschema
229      changes["endtime"] = endtime.xmlschema
230
231      tiles.each do |tile, count|
232        x = (tile.to_i >> zoom) & mask
233        y = tile.to_i & mask
234
235        t = XML::Node.new 'tile'
236        t["x"] = x.to_s
237        t["y"] = y.to_s
238        t["z"] = zoom.to_s
239        t["changes"] = count.to_s
240
241        changes << t
242      end
243
244      doc.root << changes
245
246      render :text => doc.to_s, :content_type => "text/xml"
247    else
248      render :nothing => true, :status => :bad_request
249    end
250  end
251
252  def capabilities
253    doc = OSM::API.new.get_xml_doc
254
255    api = XML::Node.new 'api'
256    version = XML::Node.new 'version'
257    version['minimum'] = "#{API_VERSION}";
258    version['maximum'] = "#{API_VERSION}";
259    api << version
260    area = XML::Node.new 'area'
261    area['maximum'] = MAX_REQUEST_AREA.to_s;
262    api << area
263   
264    doc.root << api
265
266    render :text => doc.to_s, :content_type => "text/xml"
267  end
268end
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