9fb8f5a84b
The production servers all have mod_deflate enabled anyway, which almost certainly does a better job of compression than this.
317 lines
11 KiB
Ruby
317 lines
11 KiB
Ruby
class ApiController < ApplicationController
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skip_before_action :verify_authenticity_token
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before_action :check_api_readable, :except => [:capabilities]
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before_action :setup_user_auth, :only => [:permissions]
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around_action :api_call_handle_error, :api_call_timeout
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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_s.to_i
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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 * TRACEPOINTS_PER_PAGE
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# Figure out the 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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bbox = BoundingBox.from_bbox_params(params)
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bbox.check_boundaries
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bbox.check_size
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rescue StandardError => 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.bbox(bbox).offset(offset).limit(TRACEPOINTS_PER_PAGE).order("gpx_id DESC, trackid ASC, timestamp ASC")
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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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# initialise these variables outside of the loop so that they
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# stay in scope and don't get free'd up by the GC during the
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# loop.
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gpx_id = -1
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trackid = -1
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track = nil
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trkseg = nil
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anon_track = nil
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anon_trkseg = nil
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gpx_file = nil
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timestamps = false
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points.each do |point|
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if gpx_id != point.gpx_id
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gpx_id = point.gpx_id
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trackid = -1
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gpx_file = Trace.find(gpx_id)
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if gpx_file.trackable?
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track = XML::Node.new "trk"
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doc.root << track
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timestamps = true
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if gpx_file.identifiable?
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track << (XML::Node.new("name") << gpx_file.name)
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track << (XML::Node.new("desc") << gpx_file.description)
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track << (XML::Node.new("url") << url_for(:controller => "trace", :action => "view", :display_name => gpx_file.user.display_name, :id => gpx_file.id))
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end
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else
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# use the anonymous track segment if the user hasn't allowed
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# their GPX points to be tracked.
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timestamps = false
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if anon_track.nil?
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anon_track = XML::Node.new "trk"
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doc.root << anon_track
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end
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track = anon_track
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end
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end
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if trackid != point.trackid
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if gpx_file.trackable?
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trkseg = XML::Node.new "trkseg"
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track << trkseg
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trackid = point.trackid
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else
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if anon_trkseg.nil?
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anon_trkseg = XML::Node.new "trkseg"
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anon_track << anon_trkseg
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end
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trkseg = anon_trkseg
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end
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end
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trkseg << point.to_xml_node(timestamps)
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end
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response.headers["Content-Disposition"] = "attachment; filename=\"tracks.gpx\""
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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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# 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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bbox = BoundingBox.from_bbox_params(params)
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bbox.check_boundaries
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bbox.check_size
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rescue StandardError => err
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report_error(err.message)
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return
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end
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@nodes = Node.bbox(bbox).where(:visible => true).includes(:node_tags).limit(MAX_NUMBER_OF_NODES + 1)
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node_ids = @nodes.collect(&:id)
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if node_ids.length > MAX_NUMBER_OF_NODES
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report_error("You requested too many nodes (limit is #{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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doc.root << bbox.add_bounds_to(XML::Node.new "bounds")
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# get ways
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# find which ways are needed
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ways = []
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if node_ids.length > 0
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way_nodes = WayNode.where(: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.preload(:way_nodes, :way_tags).find(way_ids)
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list_of_way_nodes = ways.collect do |way|
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way.way_nodes.collect(&:node_id)
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end
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list_of_way_nodes.flatten!
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else
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list_of_way_nodes = []
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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.includes(:node_tags).find(nodes_to_fetch)
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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 = []
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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.nodes(visible_nodes.keys).visible +
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Relation.ways(way_ids).visible
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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.relations(relations.collect(&:id)).visible
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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(nil, 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) && 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 && zoom <= 16 &&
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endtime > starttime && endtime - starttime <= 24.hours
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mask = (1 << zoom) - 1
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tiles = Node.where(:timestamp => starttime..endtime).group("maptile_for_point(latitude, longitude, #{zoom})").count
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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"] = 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"] = 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"] = 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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timeout = XML::Node.new "timeout"
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timeout["seconds"] = API_TIMEOUT.to_s
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api << timeout
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status = XML::Node.new "status"
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status["database"] = database_status.to_s
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status["api"] = api_status.to_s
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status["gpx"] = gpx_status.to_s
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api << status
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doc.root << api
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policy = XML::Node.new "policy"
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blacklist = XML::Node.new "imagery"
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IMAGERY_BLACKLIST.each do |url_regex|
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xnd = XML::Node.new "blacklist"
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xnd["regex"] = url_regex.to_s
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blacklist << xnd
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end
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policy << blacklist
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doc.root << policy
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render :text => doc.to_s, :content_type => "text/xml"
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end
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# External apps that use the api are able to query which permissions
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# they have. This currently returns a list of permissions granted to the current user:
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# * if authenticated via OAuth, this list will contain all permissions granted by the user to the access_token.
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# * if authenticated via basic auth all permissions are granted, so the list will contain all permissions.
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# * unauthenticated users have no permissions, so the list will be empty.
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def permissions
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@permissions = case
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when current_token.present?
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ClientApplication.all_permissions.select { |p| current_token.read_attribute(p) }
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when @user
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ClientApplication.all_permissions
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else
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[]
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end
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end
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end
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