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Create api map resource

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Anton Khorev 2025-01-24 10:47:58 +03:00
parent 8cf77a2f36
commit 01b5ed5d28
9 changed files with 30 additions and 30 deletions
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100
app/controllers/api/map_controller.rb
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module Api
class MapController < ApiController
authorize_resource :class => false
before_action :set_request_formats
# 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 index
# Figure out the bbox
# check boundary is sane and area within defined
# see /config/application.yml
begin
raise OSM::APIBadUserInput, "The parameter bbox is required" unless params[:bbox]
@bounds = BoundingBox.from_bbox_params(params)
@bounds.check_boundaries
@bounds.check_size
rescue StandardError => e
report_error(e.message)
return
end
nodes = Node.bbox(@bounds).where(:visible => true).includes(:node_tags).limit(Settings.max_number_of_nodes + 1)
node_ids = nodes.collect(&:id)
if node_ids.length > Settings.max_number_of_nodes
report_error("You requested too many nodes (limit is #{Settings.max_number_of_nodes}). Either request a smaller area, or use planet.osm")
return
end
# 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 = {}
@nodes = []
nodes.each do |node|
if node.visible?
visible_nodes[node.id] = node
@nodes << node
end
end
@ways = []
way_ids = []
ways.each do |way|
if way.visible?
way_ids << way.id
@ways << way
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!
response.headers["Content-Disposition"] = "attachment; filename=\"map.osm\""
# Render the result
respond_to do |format|
format.xml
format.json
end
end
end
end