Limit time controls to those dates that are actually available

[christophfriedrich]

It would be nice if the date slider and picker wouldn't blindly allow ANY date to be selected, but just those that are listed in the WMS as available. (The ODC WMS explicitly lists EACH date for that it has data, which is often annoying (because it bloats responses), but in this case very helpful.)

Excerpt of the relevant part of such a WMS GetCapabilities response:

<Layer>
  <Title>VI-Differenzen Winterweizen</Title>
  <Name>s2_vi_ndvi_diff_winter_wheat</Name>
  ....
  <KeywordList>
  <Keyword>time-series</Keyword>
  </KeywordList>
  ...
  <Dimension name="time" units="ISO8601" default="2024-08-31">
    2017-01-01,2017-01-03,2017-01-04,2017-01-07,2017-01-10,...,2024-08-28,2024-08-29,2024-08-30,2024-08-31
  </Dimension>
  ...
</Layer>

Skeleton for accessing a WMS GetCapabilities response via OpenLayers:

import WMSCapabilities from 'ol/format/WMSCapabilities';

function initTimeControls() {
  fetch('https://ows.eo2cube.org/wms?request=GetCapabilities')
  .then(function (response) {
    return response.text();
  })
  .then(function (text) {
    const parser = new WMSCapabilities();
    const result = parser.read(text);
    console.log(result);
  });
}