add route for processing parameters (#403)

#307

Author: jdries

openeo_driver/backend.py

@@ -894,6 +894,28 @@ def file_formats(self) -> dict:
         """
         return {"input": {}, "output": {}}
 
+    def processing_parameters(self) -> dict:
+        """
+        List the available processing parameters in the format defined by openEO processing parameters extension.
+
+        https://github.com/Open-EO/openeo-api/blob/draft/extensions/processing-parameters/openapi.yaml
+
+        Example output:
+        ```
+        {
+          "name": "memory"
+          "description": "Maximum amount of memory that will be allocated for processing, in gigabytes."
+          "optional": True
+          "default": 32
+          "schema":{
+            "type": "integer"
+            "minimum": 1
+          }
+        }
+        ```
+        """
+        return {}
+
     def load_disk_data(
             self, format: str, glob_pattern: str, options: dict, load_params: LoadParameters, env: EvalEnv
     ) -> DriverDataCube:

openeo_driver/views.py

@@ -507,6 +507,12 @@ def output_formats():
     def file_formats():
         return jsonify(backend_implementation.file_formats())
 
+    @api_endpoint(version=ComparableVersion("1.0.0").or_higher)
+    @blueprint.route('/processing_parameters')
+    @backend_implementation.cache_control
+    def processing_parameters():
+        return jsonify(backend_implementation.processing_parameters())
+
     @api_endpoint
     @blueprint.route('/udf_runtimes')
     @backend_implementation.cache_control

tests/test_views.py

@@ -258,6 +258,7 @@ def test_capabilities_endpoints(self, api100):
         assert endpoints["/processes"] == ["GET"]
         assert endpoints["/udf_runtimes"] == ["GET"]
         assert endpoints["/file_formats"] == ["GET"]
+        assert endpoints["/processing_parameters"] == ["GET"]
         assert endpoints["/service_types"] == ["GET"]
         assert endpoints["/services"] == ["GET", "POST"]
         assert endpoints["/services/{service_id}"] == ["DELETE", "GET"]
@@ -565,6 +566,13 @@ def test_file_formats(self, api100):
         }
         assert response.headers["Cache-Control"] == "max-age=900, public"
 
+    def test_processing_parameters(self, api100):
+        response = api100.get('/processing_parameters')
+        resp = response.assert_status_code(200).json
+        assert resp == {}
+        assert response.headers["Cache-Control"] == "max-age=900, public"
+
+
     @pytest.mark.parametrize(
         ["user_id", "expect_success"],
         [