class ApiController < ApplicationController
session :off
+ before_filter :check_read_availability, :except => [:capabilities]
after_filter :compress_output
+ # Help methods for checking boundary sanity and area size
+ include MapBoundary
+
#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
-
+ 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
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")
+ min_lon, min_lat, max_lon, max_lat = sanitise_boundaries(bbox)
+ # check boundary is sane and area within defined
+ # see /config/application.yml
+ begin
+ check_boundaries(min_lon, min_lat, max_lon, max_lat)
+ rescue Exception => err
+ report_error(err.message)
return
end
# get all the points
- points = Tracepoint.find_by_area(min_lat, min_lon, max_lat, max_lon, :select => "DISTINCT *", :offset => offset, :limit => TRACEPOINTS_PER_PAGE, :order => "timestamp DESC" )
+ points = Tracepoint.find_by_area(min_lat, min_lon, max_lat, max_lon, :offset => offset, :limit => TRACEPOINTS_PER_PAGE, :order => "timestamp DESC" )
doc = XML::Document.new
doc.encoding = 'UTF-8'
exit!
end
- render :text => doc.to_s, :content_type => "text/xml"
+ response.headers["Content-Disposition"] = "attachment; filename=\"map.osm\""
+ 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
-
# Figure out the bbox
bbox = params['bbox']
+
unless bbox and bbox.count(',') == 3
+ # alternatively: report_error(TEXT['boundary_parameter_required']
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
+ min_lon, min_lat, max_lon, max_lat = sanitise_boundaries(bbox)
- # 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")
+ # check boundary is sane and area within defined
+ # see /config/application.yml
+ begin
+ check_boundaries(min_lon, min_lat, max_lon, max_lat)
+ rescue Exception => err
+ report_error(err.message)
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
-
- # get all the nodes
- nodes = Node.find(:all, :conditions => ['latitude BETWEEN ? AND ? AND longitude BETWEEN ? AND ? AND visible = 1', min_lat, max_lat, min_lon, max_lon])
- node_ids = nodes.collect {|node| node.id }
+ # 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
+ #@nodes = Node.search(bbox, params[:tag])
- 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")
+ node_ids = @nodes.collect(&:id)
+ if node_ids.length > APP_CONFIG['max_number_of_nodes']
+ report_error("You requested too many nodes (limit is #{APP_CONFIG['max_number_of_nodes']}). 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"
+ render :text => "<osm version='#{API_VERSION}' generator='#{GENERATOR}'></osm>", :content_type => "text/xml"
return
end
- # 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})"
- 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!
-
- missing_nodes = segments_nodes - node_ids
-
- # get missing nodes if there are any
- nodes += Node.find(missing_nodes) if missing_nodes.length > 0
-
doc = OSM::API.new.get_xml_doc
+ # add bounds
+ bounds = XML::Node.new 'bounds'
+ bounds['minlat'] = min_lat.to_s
+ bounds['minlon'] = min_lon.to_s
+ bounds['maxlat'] = max_lat.to_s
+ bounds['maxlon'] = max_lon.to_s
+ doc.root << bounds
+
# 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.
-
- # seg_ids = way_segments.collect {|way_segment| way_segment.segment_id }
-
- list_of_way_segs = ways.collect {|way| way.way_segments}
- list_of_way_segs.flatten!
+ if node_ids.length > 0
+ way_nodes = WayNode.find_all_by_node_id(node_ids)
+ way_ids = way_nodes.collect { |way_node| way_node.id[0] }
+ ways = Way.find(way_ids)
- list_of_way_segments = list_of_way_segs.collect { |way_seg| way_seg.segment_id }
+ 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_segments = Array.new
+ else
+ list_of_way_nodes = Array.new
end
- # - [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]
+ # - [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]
- if segments_to_fetch.length > 0
- segments += Segment.find(segments_to_fetch)
+ if nodes_to_fetch.length > 0
+ @nodes += Node.find(nodes_to_fetch)
end
- # get more nodes
- #
-
- segments_nodes = segments.collect {|segment| segment.node_a }
- segments_nodes += segments.collect {|segment| segment.node_b }
-
- node_ids_a = nodes.collect {|node| node.id }
-
- nodes_to_get = segments_nodes - node_ids_a
- nodes += Node.find(nodes_to_get) if nodes_to_get.length > 0
-
visible_nodes = {}
user_display_name_cache = {}
- nodes.each do |node|
+ @nodes.each do |node|
if node.visible?
doc.root << node.to_xml_node(user_display_name_cache)
visible_nodes[node.id] = node
end
end
- visible_segments = {}
-
- segments.each do |segment|
- if visible_nodes[segment.node_a] and visible_nodes[segment.node_b] and segment.visible?
- doc.root << segment.to_xml_node(user_display_name_cache)
- visible_segments[segment.id] = segment
+ way_ids = Array.new
+ ways.each do |way|
+ if way.visible?
+ doc.root << way.to_xml_node(visible_nodes, user_display_name_cache)
+ way_ids << way.id
end
+ end
+
+ relations = Relation.find_for_nodes(visible_nodes.keys, :conditions => "visible = 1") +
+ Relation.find_for_ways(way_ids, :conditions => "visible = 1")
+
+ # 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.find_for_relations(relations.collect { |r| r.id }, :conditions => "visible = 1")
+
+ # 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(user_display_name_cache)
end
- ways.each do |way|
- doc.root << way.to_xml_node(visible_segments, user_display_name_cache) if way.visible?
- end
+ response.headers["Content-Disposition"] = "attachment; filename=\"map.osm\""
render :text => doc.to_s, :content_type => "text/xml"
end
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
+ starttime = endtime - hours
+ end
+
+ if zoom >= 1 and zoom <= 16 and
+ endtime > starttime and endtime - starttime <= 24.hours
+ mask = (1 << zoom) - 1
+
+ tiles = Node.count(:conditions => ["timestamp BETWEEN ? AND ?", starttime, endtime],
+ :group => "maptile_for_point(latitude, longitude, #{zoom})")
+
+ 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
+
+ # 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
api = XML::Node.new 'api'
version = XML::Node.new 'version'
- version['minimum'] = '0.4';
- version['maximum'] = '0.4';
+ 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'] = APP_CONFIG['tracepoints_per_page'].to_s
+ api << tracepoints
+ waynodes = XML::Node.new 'waynodes'
+ waynodes['maximum'] = APP_CONFIG['max_number_of_way_nodes'].to_s
+ api << waynodes
doc.root << api
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