Module: GeoblacklightAdmin::ImageService::Tms

Defined in:
app/services/geoblacklight_admin/image_service/tms.rb

Class Method Summary collapse

Class Method Details

.image_url(document, size) ⇒ String

Formats and returns a thumbnail url for a TMS endpoint from a Web Map Service. This utilizes the GeoServer specific ‘reflect’ service to generate parameters like bbox that are difficult to tweak without more detailed information about the layer.



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# File 'app/services/geoblacklight_admin/image_service/tms.rb', line 16

def self.image_url(document, size)
  # Begins with:
  # https://cugir.library.cornell.edu/geoserver/gwc/service/tms/1.0.0/cugir%3Acugir007957@EPSG%3A3857@png/{z}/{x}/{y}.png

  # Works with:
  # https://cugir.library.cornell.edu/geoserver/wms/reflect?&FORMAT=image%2Fpng&TRANSPARENT=TRUE&LAYERS=cugir007957&WIDTH=1500&HEIGHT=1500

  # Parse the URL using Addressable::URI which handles more complex URIs
  parsed_url = Addressable::URI.parse(document.viewer_endpoint)

  # Build a hash to store the extracted components
  parsed_data = {
    base_url: "#{parsed_url.scheme}://#{parsed_url.host}#{parsed_url.port ? ":" + parsed_url.port.to_s : ""}",
    path_pattern: parsed_url.path
  }

  endpoint = parsed_data[:base_url]
  "#{endpoint}/geoserver/wms/reflect?" \
    "&FORMAT=image%2Fpng" \
    "&TRANSPARENT=TRUE" \
    "&LAYERS=#{document["gbl_wxsIdentifier_s"]}" \
    "&WIDTH=#{size}" \
    "&HEIGHT=#{size}"
end