From 14b8e7619f284aa2e95ffdea605783384d202822 Mon Sep 17 00:00:00 2001
From: John McKerrell <john@mckerrell.net>
Date: Thu, 10 May 2007 14:07:37 +0000
Subject: [PATCH] Added trackpoint serving support to 0.4 API

---
 app/controllers/api_controller.rb | 95 ++++++++++++++++++++++++++++++-
 app/models/tracepoint.rb          |  8 +++
 config/routes.rb                  |  2 +
 3 files changed, 104 insertions(+), 1 deletion(-)

diff --git a/app/controllers/api_controller.rb b/app/controllers/api_controller.rb
index 3c739e37f..15e4f1c40 100644
--- a/app/controllers/api_controller.rb
+++ b/app/controllers/api_controller.rb
@@ -6,7 +6,7 @@ class ApiController < ApplicationController
   helper :user
   model :user
 
-  #COUNT is the number of map requests to allow before exiting and stating a new process
+  #COUNT is the number of map requests to allow before exiting and starting a new process
   @@count = COUNT
 
   def authorize_web
@@ -16,6 +16,99 @@ class ApiController < ApplicationController
   # 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
+    response.headers["Content-Type"] = 'text/xml'
+    #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 => ['gps_points.latitude > ? AND gps_points.longitude > ? AND gps_points.latitude < ? AND gps_points.longitude < ? AND ( public = 1 OR gpx_files.user_id = ? ) AND visible = 1', min_lat.to_i, min_lon.to_i, max_lat.to_i, max_lon.to_i, @user.id ], :select => "gps_points.*", :joins => "INNER JOIN gpx_files ON gpx_files.id = gpx_id", :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
+      @@count = COUNT
+      exit!
+    end
+
+    render :text => doc.to_s
+
+  end
+
   def map
     @@count+=1
 
diff --git a/app/models/tracepoint.rb b/app/models/tracepoint.rb
index 90de368b5..70d0f99e8 100644
--- a/app/models/tracepoint.rb
+++ b/app/models/tracepoint.rb
@@ -22,4 +22,12 @@ set_table_name 'gps_points'
   def lon
     return self.longitude.to_f / 1000000
   end
+
+  def to_xml_node
+    el1 = XML::Node.new 'trkpt'
+    el1['lat'] = self.lat.to_s
+    el1['lon'] = self.lon.to_s
+    return el1
+  end
+
 end
diff --git a/config/routes.rb b/config/routes.rb
index bcf340b8b..941991cdc 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -19,6 +19,8 @@ ActionController::Routing::Routes.draw do |map|
 
   map.connect "api/#{API_VERSION}/map", :controller => 'api', :action => 'map'
   
+  map.connect "api/#{API_VERSION}/trackpoints", :controller => 'api', :action => 'trackpoints'
+  
   map.connect "api/#{API_VERSION}/search", :controller => 'search', :action => 'search_all'
   map.connect "api/#{API_VERSION}/way/search", :controller => 'search', :action => 'search_ways'
   map.connect "api/#{API_VERSION}/segment/search", :controller => 'search', :action => 'search_segments'
-- 
2.43.2