plugin "wms_geotiff_output" is destroying capabilities document

[danceb]

Using the "wms_geotiff_output" plugin, the xml which is requested with GetCapabilities and GetProjectSettings is disturbed in several ways.

• the xml elements of whole layers from the service are missing within the request
• The encoding is not recognized as UTF-8 anymore, so special characters are not printed properly
• each new line is separated by two additional and unused blank lines (except the position, where <Format>image/tiff</Format> is inserted
• as the indent is spaces before, now it is tabs

the last two points could be solved by changing [1] to:

        xmlString = capabilitiesDoc.toprettyxml(indent=' ', encoding='utf-8')
        xmlString = '\n'.join(line for line in xmlString.decode().split('\n') if line.strip())

But I could not get the document requested in utf-8 with correct special characters and didn't find the reason, why parts are skipped in the request answer.

If I print xmlString to the console before [2], the print output contains all the layers. But somehow they are missing within the final result.

[1] https://github.com/qwc-services/qwc-qgis-server-plugins/blob/main/wms_geotiff_output/wms_geotiff_output.py#L161-L163 [2] https://github.com/qwc-services/qwc-qgis-server-plugins/blob/main/wms_geotiff_output/wms_geotiff_output.py#L164

[manisandro]

Are you requesting the final result directly from the qgis server of from the ogc service? Could you submit a PR for the fixes?

[danceb]

Via ogc service. As I couldn't find a solution for two of the four mentioned issues, I wouldn't submit a PR at the moment ...

[manisandro]

It is likely the ogc service which is filtering out the layers. Try querying directly from the qgis server (you can expose the port (say to 8001) in the docker-compose.yml and query http://localhost:8001/ows/project_name?SERVICE=WMS&....

[danceb]

Yes, the ogc service is filtering out all the layers, which contain special characters in the layer name... But it does this only with using the "wms_geotiff_output" plugin.

I don't get it, why ...

The plugin is using import xml.dom.minidom, while the ogc service is using from xml.etree import ElementTree to handle the capabilities xml. Maybe the packages are handling the reading/saving of xml a little different?

[manisandro]

Can you attach or PM the two capabilities files with and without the plugin?

[danceb]

For sure: capabilities_xml.zip

Within the archive you can find four xml files. Direct qgis server request and via ogc service, each with and without plugin. Unfortunately, I could'nt find any key difference, besides the missing layers in ogc service with plugin ...

edit: just checked, the layers with special characters are regularly written to the ogcConfig.json and permissions.json via the config server, so the ogc service should read them correctly.