103 lines
2.7 KiB
Ruby
103 lines
2.7 KiB
Ruby
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require 'uri'
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require 'nokogiri'
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require_relative '../../lib/carto/http/client'
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module CartoDB
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module WMS
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class Proxy
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SERVER_XPATH = "//OnlineResource[1]"
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FORMATS_XPATH = "//GetMap/Format"
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LAYERS_XPATH = "//Layer/Layer[BoundingBox or LatLonBoundingBox]"
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def initialize(url, preloaded_xml=nil)
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@url = url
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@response = preloaded_xml
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end
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def serialize
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run
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{ server: server, formats: formats, layers: layers }
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end
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def run
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request_capabilities unless response
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self
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end
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def request_capabilities
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http_client = Carto::Http::Client.get('wmsproxy')
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response = http_client.get(url, followlocation: true)
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raise URI::InvalidURIError unless [200, 201].include?(response.code)
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@response = response.response_body
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nil
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end
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def document
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Nokogiri::XML::Document.parse(response).remove_namespaces!
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end
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def server
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(document.at_xpath(SERVER_XPATH) || {})['href']
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end
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def formats
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document.xpath(FORMATS_XPATH).map(&:text)
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end
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def layers
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document.xpath(LAYERS_XPATH).map { |element|
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name = element.xpath("./Name").first
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title = element.xpath("./Title").first
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{
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name: (name.text if name),
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title: (title.text if title),
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crs: crs_for_element(element),
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srs: srs_for_element(element),
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bounding_boxes: bounding_boxes_for(element),
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attribution: nil
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}
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}
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end
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def crs_for_element(element)
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crs = element.xpath("./CRS").map { |element|
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element.text
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}.compact
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end
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def srs_for_element(element)
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srs = element.xpath("./SRS").map { |element|
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element.text
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}.compact
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end
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def bounding_boxes_for(element)
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bounding_boxes = element.xpath("./BoundingBox").map { |element|
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srs = element.xpath("./@SRS").first
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crs = element.xpath("./@CRS").first
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minx = element.xpath("./@minx").first
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miny = element.xpath("./@miny").first
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maxx = element.xpath("./@maxx").first
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maxy = element.xpath("./@maxy").first
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{
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srs: (srs.value if srs),
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crs: (crs.value if crs),
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minx: (minx.value if minx),
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miny: (miny.value if miny),
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maxx: (maxx.value if maxx),
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maxy: (maxy.value if maxy),
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}
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}
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end
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attr_reader :response
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private
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attr_reader :url
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end # Proxy
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end # WMS
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end # CartoDB
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