Merge pull request #80 from pblottiere/raster_layer_metadata_type

Add data type and band counts metadata for raster layers

docs/src/sandbox/raster/layers.md

@@ -23,8 +23,26 @@ true
 ### List layers and get metadata
 
 ```` shell
+# list layers
 $ curl "http://localhost:5000/api/projects/my_project/layers?schema=my_schema"
 ["polygons","dem"]
+
+# get metadata
+$ curl "http://localhost:5000/api/projects/my_project/layers/dem?schema=my_schema"
+{
+  "bands": 1,
+  "bbox": "18.6662979442000001 45.77670143760000343, 18.70359794419999844 45.81170143760000002",
+  "crs": "EPSG:4326",
+  "current_style": "default",
+  "data_type": "float32",
+  "name": "dem",
+  "source": "/dem.tif",
+  "styles": [
+    "default"
+  ],
+  "type": "raster",
+  "valid": true
+}
 ````
 
 

qsa-api/qsa_api/project.py

@@ -218,6 +218,9 @@ def layer(self, name: str) -> dict:
 
             if layer.type() == Qgis.LayerType.Vector:
                 infos["geometry"] = QgsWkbTypes.displayString(layer.wkbType())
+            elif layer.type() == Qgis.LayerType.Raster:
+                infos["bands"] = layer.bandCount()
+                infos["data_type"] = layer.dataProvider().dataType(1).name.lower()
 
             infos["source"] = layer.source()
             infos["crs"] = layer.crs().authid()
@@ -320,6 +323,10 @@ def exists(self) -> bool:
             )
             projects = storage.listProjects(uri)
 
+            # necessary step if the project has been created without QSA
+            if self.name in projects:
+                self._qgis_projects_dir().mkdir(parents=True, exist_ok=True)
+
             return self.name in projects and self._qgis_projects_dir().exists()
 
     def create(self, author: str) -> (bool, str):