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[rails.git] / app / controllers / api_controller.rb

diff --git a/app/controllers/api_controller.rb b/app/controllers/api_controller.rb
index bb135a01f55a7733de3fb75f22a54848844007bf..39706edf0b3b4e2228aa5c08735eaa4f748b5111 100644 (file)
--- a/app/controllers/api_controller.rb
+++ b/app/controllers/api_controller.rb
@@ -1,21 +1,110 @@
 class ApiController < ApplicationController
 
-  before_filter :authorize
+  session :off
   after_filter :compress_output
 
-  helper :user
-  model :user
-
-  def authorize_web
-    @current_user = User.find_by_token(session[:token])
-  end
+  #COUNT is the number of map requests to allow before exiting and starting a new process
+  @@count = COUNT
 
   # The maximum area you're allowed to request, in square degrees
   MAX_REQUEST_AREA = 0.25
 
+
+  # Number of GPS trace/trackpoints returned per-page
+  TRACEPOINTS_PER_PAGE = 5000
+  
+  def trackpoints
+    @@count+=1
+    #retrieve the page number
+    page = params['page'].to_i
+    unless page
+        page = 0;
+    end
+
+    unless page >= 0
+        report_error("Page number must be greater than or equal to 0")
+        return
+    end
+
+    offset = page * TRACEPOINTS_PER_PAGE
+
+    # Figure out the bbox
+    bbox = params['bbox']
+    unless bbox and bbox.count(',') == 3
+      report_error("The parameter bbox is required, and must be of the form min_lon,min_lat,max_lon,max_lat")
+      return
+    end
+
+    bbox = bbox.split(',')
+
+    min_lon = bbox[0].to_f
+    min_lat = bbox[1].to_f
+    max_lon = bbox[2].to_f
+    max_lat = bbox[3].to_f
+
+    # check the bbox is sane
+    unless min_lon <= max_lon
+      report_error("The minimum longitude must be less than the maximum longitude, but it wasn't")
+      return
+    end
+    unless min_lat <= max_lat
+      report_error("The minimum latitude must be less than the maximum latitude, but it wasn't")
+      return
+    end
+    unless min_lon >= -180 && min_lat >= -90 && max_lon <= 180 && max_lat <= 90
+      report_error("The latitudes must be between -90 and 90, and longitudes between -180 and 180")
+      return
+    end
+
+    # check the bbox isn't too large
+    requested_area = (max_lat-min_lat)*(max_lon-min_lon)
+    if requested_area > MAX_REQUEST_AREA
+      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")
+      return
+    end
+
+    # integerise
+    min_lat = min_lat * 1000000
+    max_lat = max_lat * 1000000
+    min_lon = min_lon * 1000000
+    max_lon = max_lon * 1000000
+    # get all the points
+    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" )
+
+    doc = XML::Document.new
+    doc.encoding = 'UTF-8'
+    root = XML::Node.new 'gpx'
+    root['version'] = '1.0'
+    root['creator'] = 'OpenStreetMap.org'
+    root['xmlns'] = "http://www.topografix.com/GPX/1/0/"
+    
+    doc.root = root
+
+    track = XML::Node.new 'trk'
+    doc.root << track
+
+    trkseg = XML::Node.new 'trkseg'
+    track << trkseg
+
+    points.each do |point|
+      trkseg << point.to_xml_node()
+    end
+
+    #exit when we have too many requests
+    if @@count > MAX_COUNT
+      render :text => doc.to_s, :content_type => "text/xml"
+      @@count = COUNT
+      exit!
+    end
+
+    render :text => doc.to_s, :content_type => "text/xml"
+
+  end
+
   def map
     GC.start
-    response.headers["Content-Type"] = 'text/xml'
+    @@count+=1
+
     # Figure out the bbox
     bbox = params['bbox']
     unless bbox and bbox.count(',') == 3
@@ -58,6 +147,12 @@ class ApiController < ApplicationController
 
     if node_ids.length > 50_000
       report_error("You requested too many nodes (limit is 50,000). Either request a smaller area, or use planet.osm")
+      return
+    end
+
+    if node_ids.length == 0
+      render :text => "<osm version='0.4'></osm>", :content_type => "text/xml"
+      return
     end
 
     # grab the segments
@@ -96,9 +191,12 @@ class ApiController < ApplicationController
 
       list_of_way_segments = list_of_way_segs.collect { |way_seg| way_seg.segment_id }
 
+       else
+         list_of_way_segments = Array.new
     end
 
-    segments_to_fetch = list_of_way_segments.uniq - segment_ids
+    # - [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
+    segments_to_fetch = (list_of_way_segments.uniq - segment_ids) - [0]
 
     if segments_to_fetch.length > 0
       segments += Segment.find(segments_to_fetch)
@@ -138,7 +236,14 @@ class ApiController < ApplicationController
       doc.root << way.to_xml_node(visible_segments, user_display_name_cache) if way.visible?
     end 
 
-    render :text => doc.to_s
+    render :text => doc.to_s, :content_type => "text/xml"
+    
+    #exit when we have too many requests
+    if @@count > MAX_COUNT
+      @@count = COUNT
+      
+      exit!
+    end
 
   end
 end