Merge pull request #35 from tomhughes/routing

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

diff --git a/app/controllers/api_controller.rb b/app/controllers/api_controller.rb
index 3cebdcf5319bc6ff6c002ce4b769809f1934a703..2f630c6d62f7801c274ea7b23b94a9e1c06f05ef 100644 (file)
--- a/app/controllers/api_controller.rb
+++ b/app/controllers/api_controller.rb
@@ -1,98 +1,319 @@
 class ApiController < ApplicationController
 
 class ApiController < ApplicationController
 

-  before_filter :authorize
+  skip_before_filter :verify_authenticity_token
+  before_filter :check_api_readable, :except => [:capabilities]
+  before_filter :setup_user_auth, :only => [:permissions]

   after_filter :compress_output
   after_filter :compress_output

+  around_filter :api_call_handle_error, :api_call_timeout

 
 

-  # The maximum area you're allowed to request, in square degrees
-  MAX_REQUEST_AREA = 0.25
+  # 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
+    #retrieve the page number
+    page = params['page'].to_s.to_i
+
+    unless page >= 0
+        report_error("Page number must be greater than or equal to 0")
+        return
+    end
+
+    offset = page * TRACEPOINTS_PER_PAGE

 
 

-  def map
-    response.headers["Content-Type"] = 'text/xml'

     # Figure out the bbox
     # 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")
+    # check boundary is sane and area within defined
+    # see /config/application.yml
+    begin
+      bbox = BoundingBox.from_bbox_params(params)
+      bbox.check_boundaries
+      bbox.check_size
+    rescue Exception => err
+      report_error(err.message)

       return
     end
 
       return
     end
 

-    bbox = bbox.split(',')
+    # get all the points
+    points = Tracepoint.bbox(bbox).offset(offset).limit(TRACEPOINTS_PER_PAGE).order("gpx_id DESC, trackid ASC, timestamp ASC")
+
+    doc = XML::Document.new
+    doc.encoding = XML::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
+
+    # initialise these variables outside of the loop so that they
+    # stay in scope and don't get free'd up by the GC during the
+    # loop.
+    gpx_id = -1
+    trackid = -1
+    track = nil
+    trkseg = nil
+    anon_track = nil
+    anon_trkseg = nil
+    gpx_file = nil
+    timestamps = false
+
+    points.each do |point|
+      if gpx_id != point.gpx_id
+        gpx_id = point.gpx_id
+        trackid = -1
+        gpx_file = Trace.find(gpx_id)

 
 

-    min_lon = bbox[0].to_f
-    min_lat = bbox[1].to_f
-    max_lon = bbox[2].to_f
-    max_lat = bbox[3].to_f
+        if gpx_file.trackable?
+          track = XML::Node.new 'trk'
+          doc.root << track
+          timestamps = true
+
+          if gpx_file.identifiable?
+            track << (XML::Node.new("name") << gpx_file.name)
+            track << (XML::Node.new("desc") << gpx_file.description)
+            track << (XML::Node.new("url") << url_for(:controller => 'trace', :action => 'view', :display_name => gpx_file.user.display_name, :id => gpx_file.id))
+          end
+        else
+          # use the anonymous track segment if the user hasn't allowed
+          # their GPX points to be tracked.
+          timestamps = false
+          if anon_track.nil? 
+            anon_track = XML::Node.new 'trk'
+            doc.root << anon_track
+          end
+          track = anon_track
+        end
+      end
+      
+      if trackid != point.trackid
+        if gpx_file.trackable?
+          trkseg = XML::Node.new 'trkseg'
+          track << trkseg
+          trackid = point.trackid
+        else
+          if anon_trkseg.nil? 
+            anon_trkseg = XML::Node.new 'trkseg'
+            anon_track << anon_trkseg
+          end
+          trkseg = anon_trkseg
+        end
+      end
+
+      trkseg << point.to_xml_node(timestamps)
+    end
+
+    response.headers["Content-Disposition"] = "attachment; filename=\"tracks.gpx\""
+
+    render :text => doc.to_s, :content_type => "text/xml"
+  end

 
 

-    # 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")
+  # 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
+    # Figure out the bbox
+    # check boundary is sane and area within defined
+    # see /config/application.yml
+    begin
+      bbox = BoundingBox.from_bbox_params(params)
+      bbox.check_boundaries
+      bbox.check_size
+    rescue Exception => err
+      report_error(err.message)

       return
     end
       return
     end

-    unless min_lat <= max_lat
-       report_error("The minimum latitude must be less than the maximum latitude, but it wasn't")
+
+    @nodes = Node.bbox(bbox).where(:visible => true).includes(:node_tags).limit(MAX_NUMBER_OF_NODES+1)
+
+    node_ids = @nodes.collect(&:id)
+    if node_ids.length > MAX_NUMBER_OF_NODES
+      report_error("You requested too many nodes (limit is #{MAX_NUMBER_OF_NODES}). Either request a smaller area, or use planet.osm")

       return
     end
       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")
+    if node_ids.length == 0
+      render :text => "<osm version='#{API_VERSION}' generator='#{GENERATOR}'></osm>", :content_type => "text/xml"

       return
       return

-       end
+    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
+    doc = OSM::API.new.get_xml_doc
+
+    # add bounds
+    doc.root << bbox.add_bounds_to(XML::Node.new 'bounds')
+
+    # get ways
+    # find which ways are needed
+    ways = Array.new
+    if node_ids.length > 0
+      way_nodes = WayNode.where(:node_id => node_ids)
+      way_ids = way_nodes.collect { |way_node| way_node.id[0] }
+      ways = Way.preload(:way_nodes, :way_tags).find(way_ids)
+
+      list_of_way_nodes = ways.collect { |way|
+        way.way_nodes.collect { |way_node| way_node.node_id }
+      }
+      list_of_way_nodes.flatten!
+
+    else
+      list_of_way_nodes = Array.new

     end
 
     end
 

-    # get all the nodes
-    nodes = Node.find(:all, :conditions => ['latitude > ? AND longitude > ? AND latitude < ? AND longitude < ? AND visible = 1', min_lat, min_lon, max_lat, max_lon])
+    # - [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
+    nodes_to_fetch = (list_of_way_nodes.uniq - node_ids) - [0]

 
 

-    node_ids = nodes.collect {|node| node.id }
+    if nodes_to_fetch.length > 0
+      @nodes += Node.includes(:node_tags).find(nodes_to_fetch)
+    end

 
 

-    # (in the future, we may wish to abort here if we found too many nodes)
+    visible_nodes = {}
+    changeset_cache = {}
+    user_display_name_cache = {}

 
 

-    # grab the segments
-    segments = Array.new
-    if node_ids.length > 0
-      node_ids_sql = "(#{node_ids.join(',')})"
-      # get the referenced segments
-      segments = Segment.find_by_sql "select * from current_segments where visible = 1 and (node_a in #{node_ids_sql} or node_b in #{node_ids_sql})"
+    @nodes.each do |node|
+      if node.visible?
+        doc.root << node.to_xml_node(changeset_cache, user_display_name_cache)
+        visible_nodes[node.id] = node
+      end

     end
     end

-    # see if we have any missing nodes
-    segments_nodes = segments.collect {|segment| segment.node_a }
-    segments_nodes += segments.collect {|segment| segment.node_b }

 
 

-    segments_nodes.uniq!
+    way_ids = Array.new
+    ways.each do |way|
+      if way.visible?
+        doc.root << way.to_xml_node(visible_nodes, changeset_cache, user_display_name_cache)
+        way_ids << way.id
+      end
+    end 

 
 

-    missing_nodes = segments_nodes - node_ids
+    relations = Relation.nodes(visible_nodes.keys).visible +
+                Relation.ways(way_ids).visible

 
 

-    # get missing nodes if there are any
-    nodes += Node.find(missing_nodes) if missing_nodes.length > 0
+    # we do not normally return the "other" partners referenced by an relation, 
+    # e.g. if we return a way A that is referenced by relation X, and there's 
+    # another way B also referenced, that is not returned. But we do make 
+    # an exception for cases where an relation references another *relation*; 
+    # in that case we return that as well (but we don't go recursive here)
+    relations += Relation.relations(relations.collect { |r| r.id }).visible

 
 

-    doc = OSM::API.get_xml_doc
+    # this "uniq" may be slightly inefficient; it may be better to first collect and output
+    # all node-related relations, then find the *not yet covered* way-related ones etc.
+    relations.uniq.each do |relation|
+      doc.root << relation.to_xml_node(nil, changeset_cache, user_display_name_cache)
+    end

 
 

-    # get ways
-    # find which ways are needed
-    segment_ids = segments.collect {|segment| segment.id }
-    ways = Array.new
-    if segment_ids.length > 0
-      way_segments = WaySegment.find_all_by_segment_id(segment_ids)
-      way_ids = way_segments.collect {|way_segment| way_segment.id }
-      ways = Way.find(way_ids) # NB: doesn't pick up segments, tags from db until accessed via way.way_segments etc.
+    response.headers["Content-Disposition"] = "attachment; filename=\"map.osm\""
+
+    render :text => doc.to_s, :content_type => "text/xml"
+  end
+
+  # Get a list of the tiles that have changed within a specified time
+  # period
+  def changes
+    zoom = (params[:zoom] || '12').to_i
+
+    if params.include?(:start) and params.include?(:end)
+      starttime = Time.parse(params[:start])
+      endtime = Time.parse(params[:end])
+    else
+      hours = (params[:hours] || '1').to_i.hours
+      endtime = Time.now.getutc
+      starttime = endtime - hours

     end
 
     end
 

-    nodes.each do |node|
-      doc.root << node.to_xml_node()
+    if zoom >= 1 and zoom <= 16 and
+       endtime > starttime and endtime - starttime <= 24.hours
+      mask = (1 << zoom) - 1
+
+      tiles = Node.where(:timestamp => starttime .. endtime).group("maptile_for_point(latitude, longitude, #{zoom})").count
+
+      doc = OSM::API.new.get_xml_doc
+      changes = XML::Node.new 'changes'
+      changes["starttime"] = starttime.xmlschema
+      changes["endtime"] = endtime.xmlschema
+
+      tiles.each do |tile, count|
+        x = (tile.to_i >> zoom) & mask
+        y = tile.to_i & mask
+
+        t = XML::Node.new 'tile'
+        t["x"] = x.to_s
+        t["y"] = y.to_s
+        t["z"] = zoom.to_s
+        t["changes"] = count.to_s
+
+        changes << t
+      end
+
+      doc.root << changes
+
+      render :text => doc.to_s, :content_type => "text/xml"
+    else
+      render :text => "Requested zoom is invalid, or the supplied start is after the end time, or the start duration is more than 24 hours", :status => :bad_request

     end
     end

+  end

 
 

-    segments.each do |segment|
-      doc.root << segment.to_xml_node()
-    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

 
 

-    ways.each do |way|
-      doc.root << way.to_xml_node()
-    end 
+    api = XML::Node.new 'api'
+    version = XML::Node.new 'version'
+    version['minimum'] = "#{API_VERSION}";
+    version['maximum'] = "#{API_VERSION}";
+    api << version
+    area = XML::Node.new 'area'
+    area['maximum'] = MAX_REQUEST_AREA.to_s;
+    api << area
+    tracepoints = XML::Node.new 'tracepoints'
+    tracepoints['per_page'] = TRACEPOINTS_PER_PAGE.to_s
+    api << tracepoints
+    waynodes = XML::Node.new 'waynodes'
+    waynodes['maximum'] = MAX_NUMBER_OF_WAY_NODES.to_s
+    api << waynodes
+    changesets = XML::Node.new 'changesets'
+    changesets['maximum_elements'] = Changeset::MAX_ELEMENTS.to_s
+    api << changesets
+    timeout = XML::Node.new 'timeout'
+    timeout['seconds'] = API_TIMEOUT.to_s
+    api << timeout
+    status = XML::Node.new 'status'
+    status['database'] = database_status.to_s
+    status['api'] = api_status.to_s
+    status['gpx'] = gpx_status.to_s
+    api << status
+    doc.root << api
+    policy = XML::Node.new 'policy'
+    blacklist = XML::Node.new 'imagery'
+    IMAGERY_BLACKLIST.each do |url_regex| 
+      xnd = XML::Node.new 'blacklist'
+      xnd['regex'] = url_regex.to_s
+      blacklist << xnd
+    end
+    policy << blacklist
+    doc.root << policy

 
 

-    render :text => doc.to_s
+    render :text => doc.to_s, :content_type => "text/xml"
+  end

 
 

+  # External apps that use the api are able to query which permissions
+  # they have. This currently returns a list of permissions granted to the current user:
+  # * if authenticated via OAuth, this list will contain all permissions granted by the user to the access_token.
+  # * if authenticated via basic auth all permissions are granted, so the list will contain all permissions.
+  # * unauthenticated users have no permissions, so the list will be empty.
+  def permissions
+    @permissions = case
+                   when current_token.present?
+                     ClientApplication.all_permissions.select { |p| current_token.read_attribute(p) }
+                   when @user
+                     ClientApplication.all_permissions
+                   else
+                     []
+                   end

   end
 end
   end
 end