#280 Schneider capability

* refactors update_parcels() method in Geometry model to work on Schneider
* old WFS based logic still exists as update_parcels_wfs() in Geometry model to have a fallback. Can be deleted in the future

konova/utils/schneider/fetcher.py

@@ -0,0 +1,59 @@
+"""
+Author: Michel Peltriaux
+Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
+Contact: ksp-servicestelle@sgdnord.rlp.de
+Created on: 14.12.22
+
+"""
+import json
+from json import JSONDecodeError
+
+import requests
+
+from konova.sub_settings import schneider_settings
+
+
+class ParcelFetcher:
+    base_url = schneider_settings.base_url
+    auth_header = schneider_settings.auth_header
+    auth_header_token = schneider_settings.auth_header_token
+
+    geometry = None
+    geojson = None
+    results = None
+
+    def __init__(self, geometry):
+        if geometry is None:
+            raise AssertionError("Geometry must not be none")
+        self.geometry = geometry
+
+        # Reduce size of geometry to avoid "intersections" because of exact border matching
+        geom = geometry.geom.buffer(-0.001)
+        self.geojson = geom.ewkt
+        self.results = []
+
+    def get_parcels(self, url: str = None):
+        post_url = url
+        if post_url is None:
+            post_url = f"{self.base_url}/parcel/intersect/"
+
+        response = requests.post(
+            url=post_url,
+            data=self.geojson,
+            headers={
+                self.auth_header: self.auth_header_token
+            }
+        )
+
+        try:
+            content = json.loads(response.content.decode("utf-8"))
+        except JSONDecodeError:
+            content = {}
+        next = content.get("next", None)
+        fetched_parcels = content.get("results", [])
+        self.results += fetched_parcels
+
+        if next:
+            self.get_parcels(next)
+
+        return self.results