270 lines
9.2 KiB
Ruby
270 lines
9.2 KiB
Ruby
class ApiController < ApplicationController
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session :off
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before_filter :check_api_readable, :except => [:capabilities]
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after_filter :compress_output
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# Help methods for checking boundary sanity and area size
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include MapBoundary
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# Get an XML response containing a list of tracepoints that have been uploaded
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# within the specified bounding box, and in the specified page.
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def trackpoints
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#retrieve the page number
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page = params['page'].to_i
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unless page
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page = 0;
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end
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unless page >= 0
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report_error("Page number must be greater than or equal to 0")
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return
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end
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offset = page * APP_CONFIG['tracepoints_per_page']
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# Figure out the bbox
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bbox = params['bbox']
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unless bbox and bbox.count(',') == 3
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report_error("The parameter bbox is required, and must be of the form min_lon,min_lat,max_lon,max_lat")
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return
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end
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bbox = bbox.split(',')
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min_lon, min_lat, max_lon, max_lat = sanitise_boundaries(bbox)
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# check boundary is sane and area within defined
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# see /config/application.yml
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begin
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check_boundaries(min_lon, min_lat, max_lon, max_lat)
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rescue Exception => err
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report_error(err.message)
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return
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end
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# get all the points
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points = Tracepoint.find_by_area(min_lat, min_lon, max_lat, max_lon, :offset => offset, :limit => APP_CONFIG['tracepoints_per_page'], :order => "timestamp DESC" )
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doc = XML::Document.new
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doc.encoding = XML::Encoding::UTF_8
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root = XML::Node.new 'gpx'
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root['version'] = '1.0'
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root['creator'] = 'OpenStreetMap.org'
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root['xmlns'] = "http://www.topografix.com/GPX/1/0/"
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doc.root = root
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track = XML::Node.new 'trk'
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doc.root << track
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trkseg = XML::Node.new 'trkseg'
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track << trkseg
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points.each do |point|
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trkseg << point.to_xml_node()
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end
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response.headers["Content-Disposition"] = "attachment; filename=\"map.osm\""
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render :text => doc.to_s, :content_type => "text/xml"
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end
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# This is probably the most common call of all. It is used for getting the
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# OSM data for a specified bounding box, usually for editing. First the
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# bounding box (bbox) is checked to make sure that it is sane. All nodes
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# are searched, then all the ways that reference those nodes are found.
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# All Nodes that are referenced by those ways are fetched and added to the list
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# of nodes.
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# Then all the relations that reference the already found nodes and ways are
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# fetched. All the nodes and ways that are referenced by those ways are then
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# fetched. Finally all the xml is returned.
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def map
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# Figure out the bbox
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bbox = params['bbox']
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unless bbox and bbox.count(',') == 3
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# alternatively: report_error(TEXT['boundary_parameter_required']
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report_error("The parameter bbox is required, and must be of the form min_lon,min_lat,max_lon,max_lat")
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return
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end
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bbox = bbox.split(',')
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min_lon, min_lat, max_lon, max_lat = sanitise_boundaries(bbox)
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# check boundary is sane and area within defined
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# see /config/application.yml
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begin
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check_boundaries(min_lon, min_lat, max_lon, max_lat)
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rescue Exception => err
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report_error(err.message)
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return
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end
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# FIXME um why is this area using a different order for the lat/lon from above???
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@nodes = Node.find_by_area(min_lat, min_lon, max_lat, max_lon, :conditions => {:visible => true}, :include => :node_tags, :limit => APP_CONFIG['max_number_of_nodes']+1)
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# get all the nodes, by tag not yet working, waiting for change from NickB
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# need to be @nodes (instance var) so tests in /spec can be performed
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#@nodes = Node.search(bbox, params[:tag])
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node_ids = @nodes.collect(&:id)
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if node_ids.length > APP_CONFIG['max_number_of_nodes']
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report_error("You requested too many nodes (limit is #{APP_CONFIG['max_number_of_nodes']}). Either request a smaller area, or use planet.osm")
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return
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end
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if node_ids.length == 0
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render :text => "<osm version='#{API_VERSION}' generator='#{GENERATOR}'></osm>", :content_type => "text/xml"
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return
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end
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doc = OSM::API.new.get_xml_doc
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# add bounds
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bounds = XML::Node.new 'bounds'
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bounds['minlat'] = min_lat.to_s
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bounds['minlon'] = min_lon.to_s
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bounds['maxlat'] = max_lat.to_s
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bounds['maxlon'] = max_lon.to_s
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doc.root << bounds
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# get ways
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# find which ways are needed
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ways = Array.new
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if node_ids.length > 0
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way_nodes = WayNode.find_all_by_node_id(node_ids)
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way_ids = way_nodes.collect { |way_node| way_node.id[0] }
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ways = Way.find(way_ids, :include => [:way_nodes, :way_tags])
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list_of_way_nodes = ways.collect { |way|
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way.way_nodes.collect { |way_node| way_node.node_id }
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}
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list_of_way_nodes.flatten!
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else
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list_of_way_nodes = Array.new
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end
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# - [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
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nodes_to_fetch = (list_of_way_nodes.uniq - node_ids) - [0]
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if nodes_to_fetch.length > 0
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@nodes += Node.find(nodes_to_fetch, :include => :node_tags)
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end
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visible_nodes = {}
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changeset_cache = {}
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user_display_name_cache = {}
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@nodes.each do |node|
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if node.visible?
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doc.root << node.to_xml_node(changeset_cache, user_display_name_cache)
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visible_nodes[node.id] = node
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end
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end
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way_ids = Array.new
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ways.each do |way|
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if way.visible?
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doc.root << way.to_xml_node(visible_nodes, changeset_cache, user_display_name_cache)
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way_ids << way.id
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end
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end
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relations = Relation.find_for_nodes(visible_nodes.keys, :conditions => {:visible => true}) +
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Relation.find_for_ways(way_ids, :conditions => {:visible => true})
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# we do not normally return the "other" partners referenced by an relation,
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# e.g. if we return a way A that is referenced by relation X, and there's
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# another way B also referenced, that is not returned. But we do make
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# an exception for cases where an relation references another *relation*;
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# in that case we return that as well (but we don't go recursive here)
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relations += Relation.find_for_relations(relations.collect { |r| r.id }, :conditions => {:visible => true})
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# this "uniq" may be slightly inefficient; it may be better to first collect and output
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# all node-related relations, then find the *not yet covered* way-related ones etc.
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relations.uniq.each do |relation|
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doc.root << relation.to_xml_node(changeset_cache, user_display_name_cache)
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end
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response.headers["Content-Disposition"] = "attachment; filename=\"map.osm\""
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render :text => doc.to_s, :content_type => "text/xml"
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end
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# Get a list of the tiles that have changed within a specified time
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# period
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def changes
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zoom = (params[:zoom] || '12').to_i
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if params.include?(:start) and params.include?(:end)
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starttime = Time.parse(params[:start])
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endtime = Time.parse(params[:end])
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else
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hours = (params[:hours] || '1').to_i.hours
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endtime = Time.now.getutc
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starttime = endtime - hours
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end
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if zoom >= 1 and zoom <= 16 and
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endtime > starttime and endtime - starttime <= 24.hours
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mask = (1 << zoom) - 1
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tiles = Node.count(:conditions => ["timestamp BETWEEN ? AND ?", starttime, endtime],
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:group => "maptile_for_point(latitude, longitude, #{zoom})")
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doc = OSM::API.new.get_xml_doc
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changes = XML::Node.new 'changes'
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changes["starttime"] = starttime.xmlschema
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changes["endtime"] = endtime.xmlschema
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tiles.each do |tile, count|
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x = (tile.to_i >> zoom) & mask
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y = tile.to_i & mask
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t = XML::Node.new 'tile'
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t["x"] = x.to_s
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t["y"] = y.to_s
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t["z"] = zoom.to_s
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t["changes"] = count.to_s
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changes << t
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end
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doc.root << changes
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render :text => doc.to_s, :content_type => "text/xml"
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else
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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
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end
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end
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# External apps that use the api are able to query the api to find out some
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# parameters of the API. It currently returns:
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# * minimum and maximum API versions that can be used.
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# * maximum area that can be requested in a bbox request in square degrees
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# * number of tracepoints that are returned in each tracepoints page
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def capabilities
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doc = OSM::API.new.get_xml_doc
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api = XML::Node.new 'api'
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version = XML::Node.new 'version'
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version['minimum'] = "#{API_VERSION}";
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version['maximum'] = "#{API_VERSION}";
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api << version
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area = XML::Node.new 'area'
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area['maximum'] = APP_CONFIG['max_request_area'].to_s;
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api << area
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tracepoints = XML::Node.new 'tracepoints'
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tracepoints['per_page'] = APP_CONFIG['tracepoints_per_page'].to_s
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api << tracepoints
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waynodes = XML::Node.new 'waynodes'
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waynodes['maximum'] = APP_CONFIG['max_number_of_way_nodes'].to_s
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api << waynodes
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changesets = XML::Node.new 'changesets'
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changesets['maximum_elements'] = Changeset::MAX_ELEMENTS.to_s
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api << changesets
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doc.root << api
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render :text => doc.to_s, :content_type => "text/xml"
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end
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end
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