X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/24b21e4a29d28a3174965d449d36465ecda9ead7..32b280eb8dfd11d03646cb89c339d2b938f06a6e:/app/controllers/api_controller.rb

diff --git a/app/controllers/api_controller.rb b/app/controllers/api_controller.rb
index 8b876d3a7..c337038a0 100644
--- a/app/controllers/api_controller.rb
+++ b/app/controllers/api_controller.rb
@@ -11,12 +11,13 @@ class ApiController < ApplicationController
   @@count = COUNT
 
   # The maximum area you're allowed to request, in square degrees
-  MAX_REQUEST_AREA = 0.25
+  MAX_REQUEST_AREA = APP_CONFIG['max_request_area']
 
   # Number of GPS trace/trackpoints returned per-page
-  TRACEPOINTS_PER_PAGE = 5000
+  TRACEPOINTS_PER_PAGE = APP_CONFIG['tracepoints_per_page']
 
-  
+  # Get an XML response containing a list of tracepoints that have been uploaded
+  # within the specified bounding box, and in the specified page.
   def trackpoints
     @@count+=1
     #retrieve the page number
@@ -84,6 +85,15 @@ class ApiController < ApplicationController
     render :text => doc.to_s, :content_type => "text/xml"
   end
 
+  # This is probably the most common call of all. It is used for getting the 
+  # OSM data for a specified bounding box, usually for editing. First the
+  # bounding box (bbox) is checked to make sure that it is sane. All nodes 
+  # are searched, then all the ways that reference those nodes are found.
+  # All Nodes that are referenced by those ways are fetched and added to the list
+  # of nodes.
+  # Then all the relations that reference the already found nodes and ways are
+  # fetched. All the nodes and ways that are referenced by those ways are then 
+  # fetched. Finally all the xml is returned.
   def map
     GC.start
     @@count+=1
@@ -109,6 +119,7 @@ class ApiController < ApplicationController
       return
     end
 
+    # FIXME um why is this area using a different order for the lat/lon from above???
     @nodes = Node.find_by_area(min_lat, min_lon, max_lat, max_lon, :conditions => "visible = 1", :limit => APP_CONFIG['max_number_of_nodes']+1)
     # get all the nodes, by tag not yet working, waiting for change from NickB
     # need to be @nodes (instance var) so tests in /spec can be performed
@@ -204,6 +215,8 @@ class ApiController < ApplicationController
     end
   end
 
+  # Get a list of the tiles that have changed within a specified time
+  # period
   def changes
     zoom = (params[:zoom] || '12').to_i
 
@@ -245,10 +258,15 @@ class ApiController < ApplicationController
 
       render :text => doc.to_s, :content_type => "text/xml"
     else
-      render :nothing => true, :status => :bad_request
+      render :text => "Requested zoom is invalid", :status => :bad_request
     end
   end
 
+  # External apps that use the api are able to query the api to find out some 
+  # parameters of the API. It currently returns: 
+  # * minimum and maximum API versions that can be used.
+  # * maximum area that can be requested in a bbox request in square degrees
+  # * number of tracepoints that are returned in each tracepoints page
   def capabilities
     doc = OSM::API.new.get_xml_doc
 
@@ -260,6 +278,9 @@ class ApiController < ApplicationController
     area = XML::Node.new 'area'
     area['maximum'] = MAX_REQUEST_AREA.to_s;
     api << area
+    tracepoints = XML::Node.new 'tracepoints'
+    tracepoints['per_page'] = APP_CONFIG['tracepoints_per_page'].to_s
+    api << tracepoints
     
     doc.root << api