Use a builder view for the capabilities call

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

diff --git a/app/controllers/api_controller.rb b/app/controllers/api_controller.rb
index 99afae6729e98a46be9dc27118db686c09617602..90883376c97d7af2cf8239b582baea67d576b7e9 100644 (file)
--- a/app/controllers/api_controller.rb
+++ b/app/controllers/api_controller.rb
@@ -1,27 +1,275 @@
 class ApiController < ApplicationController
 class ApiController < ApplicationController

+  skip_before_action :verify_authenticity_token
+  before_action :check_api_readable, :except => [:capabilities]
+  before_action :setup_user_auth, :only => [:permissions]
+  around_action :api_call_handle_error, :api_call_timeout

 
 

-  def map
+  # 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

 
 

+    # 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 StandardError => err
+      report_error(err.message)
+      return
+    end
+
+    # get all the points
+    ordered_points = Tracepoint.bbox(bbox).joins(:trace).where(:gpx_files => { :visibility => %w[trackable identifiable] }).order("gpx_id DESC, trackid ASC, timestamp ASC")
+    unordered_points = Tracepoint.bbox(bbox).joins(:trace).where(:gpx_files => { :visibility => %w[public private] }).order("gps_points.latitude", "gps_points.longitude", "gps_points.timestamp")
+    points = ordered_points.union_all(unordered_points).offset(offset).limit(TRACEPOINTS_PER_PAGE)

 
     doc = XML::Document.new
 
     doc = XML::Document.new

-    doc.encoding = 'UTF-8' 
-    root = XML::Node.new 'osm'
-    root['version'] = '0.4'
-    root['generator'] = 'OpenStreetMap server'
+    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
 
     doc.root = root
 

-    render :text => doc.to_s
-    
-    #el1 = XML::Node.new 'node'
-    #el1['id'] = self.id.to_s
-    #el1['lat'] = self.latitude.to_s
-    #el1['lon'] = self.longitude.to_s
-    #Node.split_tags(el1, self.tags)
-    #el1['visible'] = self.visible.to_s
-    #el1['timestamp'] = self.timestamp.xmlschema
-    #root << el1
+    # 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)
+
+        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 => "traces", :action => "show", :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 :xml => doc.to_s

   end
 
   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
+    # 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 StandardError => err
+      report_error(err.message)
+      return
+    end
+
+    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
+
+    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 = []
+    if node_ids.empty?
+      list_of_way_nodes = []
+    else
+      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 do |way|
+        way.way_nodes.collect(&:node_id)
+      end
+      list_of_way_nodes.flatten!
+    end
+
+    # - [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]
+
+    nodes += Node.includes(:node_tags).find(nodes_to_fetch) unless nodes_to_fetch.empty?
+
+    visible_nodes = {}
+    changeset_cache = {}
+    user_display_name_cache = {}

 
 

+    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

 
 

+    way_ids = []
+    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
+
+    relations = Relation.nodes(visible_nodes.keys).visible +
+                Relation.ways(way_ids).visible
+
+    # 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(&:id)).visible
+
+    # 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(changeset_cache, user_display_name_cache)
+    end
+
+    response.headers["Content-Disposition"] = "attachment; filename=\"map.osm\""
+
+    render :xml => doc.to_s
+  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) && 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
+
+    if zoom >= 1 && zoom <= 16 &&
+       endtime > starttime && 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 :xml => doc.to_s
+    else
+      render :plain => "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
+
+  # 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
+    @database_status = database_status
+    @api_status = api_status
+    @gpx_status = gpx_status
+  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 = if current_token.present?
+                     ClientApplication.all_permissions.select { |p| current_token.read_attribute(p) }
+                   elsif current_user
+                     ClientApplication.all_permissions
+                   else
+                     []
+                   end
+  end

 end
 end