+ ##
+ # query changesets by bounding box, time, user or open/closed status.
+ def query
+ # create the conditions that the user asked for. some or all of
+ # these may be nil.
+ conditions = conditions_bbox(params['bbox'])
+ cond_merge conditions, conditions_user(params['user'])
+ cond_merge conditions, conditions_time(params['time'])
+ cond_merge conditions, conditions_open(params['open'])
+
+ # create the results document
+ results = OSM::API.new.get_xml_doc
+
+ # add all matching changesets to the XML results document
+ Changeset.find(:all,
+ :conditions => conditions,
+ :limit => 100,
+ :order => 'created_at desc').each do |cs|
+ results.root << cs.to_xml_node
+ end
+
+ render :text => results.to_s, :content_type => "text/xml"
+
+ rescue ActiveRecord::RecordNotFound
+ render :nothing => true, :status => :not_found
+ rescue OSM::APIError => ex
+ render ex.render_opts
+ rescue String => s
+ render :text => s, :content_type => "text/plain", :status => :bad_request
+ end
+
+ ##
+ # merge two conditions
+ def cond_merge(a, b)
+ if a and b
+ a_str = a.shift
+ b_str = b.shift
+ return [ a_str + " and " + b_str ] + a + b
+ elsif a
+ return a
+ else b
+ return b
+ end
+ end
+
+ ##
+ # if a bounding box was specified then parse it and do some sanity
+ # checks. this is mostly the same as the map call, but without the
+ # area restriction.
+ def conditions_bbox(bbox)
+ unless bbox.nil?
+ raise "Bounding box should be min_lon,min_lat,max_lon,max_lat" unless bbox.count(',') == 3
+ bbox = sanitise_boundaries(bbox.split(/,/))
+ raise "Minimum longitude should be less than maximum." unless bbox[0] <= bbox[2]
+ raise "Minimum latitude should be less than maximum." unless bbox[1] <= bbox[3]
+ return ['min_lon < ? and max_lon > ? and min_lat < ? and max_lat > ?',
+ bbox[2] * SCALE, bbox[0] * SCALE, bbox[3]* SCALE, bbox[1] * SCALE]
+ else
+ return nil
+ end
+ end
+
+ ##
+ # restrict changesets to those by a particular user
+ def conditions_user(user)
+ unless user.nil?
+ u = User.find(user.to_i)
+ raise OSM::APINotFoundError unless u.data_public?
+ return ['user_id = ?', u.id]
+ else
+ return nil
+ end
+ end
+
+ ##
+ # restrict changes to those during a particular time period
+ def conditions_time(time)
+ unless time.nil?
+ # if there is a range, i.e: comma separated, then the first is
+ # low, second is high - same as with bounding boxes.
+ if time.count(',') == 1
+ from, to = time.split(/,/).collect { |t| Date.parse(t) }
+ return ['created_at > ? and created_at < ?', from, to]
+ else
+ # if there is no comma, assume its a lower limit on time
+ return ['created_at > ?', Date.parse(time)]
+ end
+ else
+ return nil
+ end
+ rescue ArgumentError => ex
+ raise ex.message.to_s
+ end
+
+ ##
+ # restrict changes to those which are open
+ def conditions_open(open)
+ return open.nil? ? nil : ['open = ?', true]
+ end
+
projects / rails.git / commitdiff