Publish added vector layers as WFS in QGIS Server

[JakobMiksch]

Adding vector layers to a QGIS project file works as expected. But they are not published as WFS in the QGIS Server settings. See screenshot below.

Is it possible to use the QSA API to publish a vector layer as WFS in the QGIS Server settings block?

relevant links:

• https://gis.stackexchange.com/questions/362890/publishing-a-layer-as-wfs-with-pyqgis
• https://gis.stackexchange.com/questions/412953/read-wfs-layers-with-pyqgis

I hacked together this function which might be useful:

# get published WFS layers
wfsLayers, ok = QgsProject.instance().readListEntry('WFSLayers', '/')
print('wfs_layers', wfsLayers)

# set published WFS layers
def set_wfs_layers(qgis_project_instance, layer_ids):
    qgis_project_instance.writeEntry( "WFSLayers" , "/", layer_ids)
    geometry_precision = 8
    for layer_id in layer_ids:
        qgis_project_instance.writeEntry( "WFSLayersPrecision", "/" + layer_id, geometry_precision) 
    qgis_project_instance.write()

• demo implemenation: siticom@fa47909

[JakobMiksch]

@pblottiere I am considering to implement this.

My idea would be to add a wfs property to the "layer definition" so it would look like this:

• type
• name
• datasource
• overview (optional)
• crs (optional)
• publication
  • wfs
    • published (boolean)
    • precision (integer)
    • in future: transaction (update, insert, delete)
  • in future: wms
  • in future: wmts
  • in future: wcs

what do you think about that?

[pblottiere]

Hello @JakobMiksch,

I am considering to implement this.

Nice 🎉

what do you think about that?

Yes indeed it's a good idea 👍. I'm just afraid to clutter the layer definition 🤔.

Another way would be to add a specific service endpoint for layers. For example a POST /api/projects/<project_name>/layers/<layer_name>/wfs with a payload for options and configuration.

"published": True,
"geometry_precision": 8,
"update": True,
...

For WMTS with /api/projects/<project_name>/layers/<layer_name>/wmts:

"published": True,
"PNG": True,
"JPEG": False

And by default a layer could only be published in WMS? What do you think?

[JakobMiksch]

Your approach looks good as well.

QGIS published WMS by default, that's why I would leave this behavior with QSA as well. However, it should be possible to deactivate the publication of WMS for a layer.

Another question:
how should a user find out if a layer is for example published via WFS?

would that be in the response of GET /api/projects/{project}/layers/{layer} ?

[pblottiere]

QGIS published WMS by default, that's why I would leave this behavior with QSA as well. However, it should be possible to deactivate the publication of WMS for a layer.

Yes, I agree 👍. A POST /api/projects/<project_name>/layers/<layer_name>/wms entrypoint should be made available too.

how should a user find out if a layer is for example published via WFS?

To be consistent with the "publish" API, a GET /api/projects/{project}/layers/{layer}/wfs entrypoint would probably be enough.