VLN-API integriert
This commit is contained in:
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"""HTTP-Client für die VLN-Manager-API.
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API-Vertrag (Stand 2026-06-08):
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Basis-URL: https://api.flurneuordnung-sachsen.de/v2
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POST /person/login
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Body: {"mail": "...", "password": "..."}
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Antwort: {"data": {"userauth": "<url_token>", "id": ...}}
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Das userauth-Token ist der API-Key (= PERSON.url_token).
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GET /tgen -> Teilnehmergemeinschaften (Verfahren)
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GET /maps/<layer>/{vkz} -> GeoJSON FeatureCollection (EPSG:25833)
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PUT /maps/<layer>/{vkz} <- GeoJSON (ersetzt den Layer dieser VKZ)
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Antwort: {"data": {"vkz", "layer", "art", "speicher_id"}, "status": "ok"}
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Layer: umringe, p41, st, kas, we
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Auth nach Login über den Header "X-API-Key".
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Fehlerformat: RFC 7807 (application/problem+json).
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Es wird QgsBlockingNetworkRequest verwendet, damit Proxy- und
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Zertifikatseinstellungen aus QGIS automatisch greifen.
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"""
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import json
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from sn_basis.functions.qt_wrapper import QUrl, QNetworkRequest
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from sn_basis.functions.qgiscore_wrapper import QgsBlockingNetworkRequest
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# Fest verdrahtete Produktiv-API des VLN Managers.
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DEFAULT_BASE_URL = "https://api.flurneuordnung-sachsen.de/v2"
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class ApiError(Exception):
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"""Fehler bei der Kommunikation mit der Karten-API."""
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class AuthError(ApiError):
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"""API-Key fehlt, ist abgelaufen oder hat keine Berechtigung (401/403)."""
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class KartenApiClient:
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def __init__(self, base_url=DEFAULT_BASE_URL, api_key=None, mail=None):
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self.base_url = base_url.rstrip("/")
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self.api_key = api_key
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self.mail = mail
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@property
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def is_authenticated(self):
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return bool(self.api_key)
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def login(self, mail, password):
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"""Meldet den Benutzer an. Die API liefert das userauth-Token
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(= API-Key), das für alle weiteren Requests verwendet wird."""
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data = self._request(
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"POST",
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"/person/login",
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payload={"mail": mail, "password": password},
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with_auth=False,
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)
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payload = data.get("data") if isinstance(data, dict) else None
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if not isinstance(payload, dict):
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payload = data if isinstance(data, dict) else {}
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api_key = payload.get("userauth")
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if not api_key:
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raise ApiError(
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"Login-Antwort enthielt kein userauth-Token. "
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"Erhaltene Antwort: %s" % json.dumps(data)[:300]
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)
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self.api_key = api_key
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self.mail = mail
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return api_key
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def logout(self):
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self.api_key = None
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self.mail = None
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# ------------------------------------------------------------------
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# Verfahren (Teilnehmergemeinschaften)
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# ------------------------------------------------------------------
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def get_verfahren(self):
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"""Liste der Verfahren (TGs) als [{"vkz": ..., "name": ...}, ...],
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sortiert nach VKZ. Quelle: GET /tgen."""
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data = self._request("GET", "/tgen")
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rows = None
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if isinstance(data, list):
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rows = data
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elif isinstance(data, dict):
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for key in ("data", "rows"):
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value = data.get(key)
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if isinstance(value, list):
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rows = value
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break
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if isinstance(value, dict) and isinstance(value.get("rows"), list):
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rows = value["rows"]
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break
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if rows is None:
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raise ApiError(
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"Antwort von /tgen hat ein unerwartetes Format: %s"
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% json.dumps(data)[:200]
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)
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verfahren = []
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for row in rows:
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if not isinstance(row, dict):
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continue
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vkz = row.get("vkz") or row.get("VKZ")
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name = (
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row.get("kurzname")
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or row.get("Kurzname")
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or row.get("name")
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or row.get("Name")
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or ""
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)
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if vkz:
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verfahren.append({"vkz": str(vkz), "name": str(name)})
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verfahren.sort(key=lambda v: v["vkz"])
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return verfahren
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# ------------------------------------------------------------------
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# Karten-Layer
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# ------------------------------------------------------------------
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def load_layer_complete(self, layer_key, vkz, page_size=2000):
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"""Lädt ALLE Objekte eines Layers für eine VKZ aus KARTE_OBJEKT.
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Nutzt den Listen-Endpunkt /maps/<layer>?vkz=… mit limit/offset-Paging,
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bis keine weitere Seite mehr kommt."""
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from urllib.parse import quote
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features = []
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offset = 0
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while True:
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data = self._request(
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"GET",
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"/maps/%s?vkz=%s&limit=%d&offset=%d"
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% (quote(str(layer_key)), quote(str(vkz)), page_size, offset),
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)
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if not isinstance(data, dict) or data.get("type") != "FeatureCollection":
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raise ApiError(
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"Antwort von /maps/%s ist keine GeoJSON FeatureCollection."
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% layer_key
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)
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page = data.get("features", [])
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features.extend(page)
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if len(page) < page_size:
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break
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offset += page_size
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return {"type": "FeatureCollection", "features": features}
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def load_feature_collection(self, path):
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"""Lädt einen Layer als GeoJSON FeatureCollection (dict)."""
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data = self._request("GET", path)
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if isinstance(data, dict):
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if data.get("type") == "FeatureCollection":
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return data
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inner = data.get("data")
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if isinstance(inner, dict) and inner.get("type") == "FeatureCollection":
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return inner
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raise ApiError(
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"Antwort von %s ist keine GeoJSON FeatureCollection." % path
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)
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def save_feature_collection(self, path, feature_collection):
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"""Schreibt eine GeoJSON FeatureCollection zurück an die API
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(PUT ersetzt den kompletten Layer der jeweiligen VKZ)."""
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return self._request("PUT", path, payload=feature_collection)
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# ------------------------------------------------------------------
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# Intern
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# ------------------------------------------------------------------
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def _request(self, method, path, payload=None, with_auth=True):
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if with_auth and not self.is_authenticated:
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raise AuthError("Nicht angemeldet — bitte zuerst einloggen.")
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request = QNetworkRequest(QUrl(self.base_url + path))
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request.setHeader(
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QNetworkRequest.KnownHeaders.ContentTypeHeader, "application/json"
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)
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request.setRawHeader(b"Accept", b"application/json")
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if with_auth:
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request.setRawHeader(b"X-API-Key", self.api_key.encode("utf-8"))
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body = b""
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if payload is not None:
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body = json.dumps(payload).encode("utf-8")
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blocking = QgsBlockingNetworkRequest()
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if method == "GET":
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error = blocking.get(request)
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elif method == "POST":
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error = blocking.post(request, body)
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elif method == "PUT":
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error = blocking.put(request, body)
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else:
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raise ApiError("Nicht unterstützte HTTP-Methode: %s" % method)
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reply = blocking.reply()
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content = bytes(reply.content())
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status = reply.attribute(
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QNetworkRequest.Attribute.HttpStatusCodeAttribute
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)
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status = int(status) if status is not None else None
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if status in (401, 403):
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raise AuthError(
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"Keine Berechtigung für %s %s (HTTP %s)%s"
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% (method, path, status, self._error_detail(content))
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)
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if error != QgsBlockingNetworkRequest.NoError:
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raise ApiError(
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"%s %s fehlgeschlagen: %s%s"
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% (method, path, blocking.errorMessage(), self._error_detail(content))
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)
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if status is not None and status >= 400:
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raise ApiError(
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"%s %s lieferte HTTP %s%s"
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% (method, path, status, self._error_detail(content))
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)
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if not content:
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return None
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try:
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return json.loads(content.decode("utf-8"))
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except ValueError:
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raise ApiError(
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"Antwort von %s ist kein gültiges JSON." % path
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)
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@staticmethod
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def _error_detail(content):
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"""Liest title/detail aus einer RFC-7807-Fehlerantwort."""
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if not content:
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return ""
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try:
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problem = json.loads(content.decode("utf-8"))
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parts = [
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str(problem[k]) for k in ("title", "detail") if problem.get(k)
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]
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if parts:
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return " — " + ": ".join(parts)
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except (ValueError, AttributeError):
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pass
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return " — " + content[:300].decode("utf-8", "replace")
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@@ -0,0 +1,378 @@
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"""
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sn_plan41/modules/vln_api_logic.py – Fachlogik für die VLN-API-Integration in Tab A.
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Kapselt:
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- Anmeldung / Abmeldung (KartenApiClient aus vln_karten)
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- Persistierung des API-Keys in QSettings
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- Verfahrensliste laden (GET /tgen)
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- Persistierung der VKZ-Auswahl in der Projektdatei
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- Plan 41 laden (2 Layer + Stile aus sn_plan41/assets/)
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- Aktiven Layer hochladen
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Voraussetzung: Das Plugin `vln_karten` muss installiert sein.
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Wenn nicht vorhanden, liefert :attr:`is_available` False; die UI
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kann dann einen entsprechenden Hinweis anzeigen.
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Sitzungsablauf bei AuthError:
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- :meth:`handle_session_expired` aufrufen → API-Key löschen + logout
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- In der UI danach :meth:`_update_vln_ui_state` aufrufen und
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QMessageBox.warning anzeigen. Kein automatischer Login-Dialog.
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"""
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from __future__ import annotations
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from typing import Optional
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from sn_basis.functions.qt_wrapper import QSettings
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from sn_basis.functions.qgiscore_wrapper import QgsProject
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from sn_basis.functions.sys_wrapper import get_plugin_root, join_path
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from sn_basis.functions.ly_style_wrapper import apply_style_from_path
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# Lokale API-Module — fallenübrig, sobald QGIS verfügbar ist.
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# In der reinen Python-Testumgebung (kein qgis-Paket) schlagen die
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# qgis-Imports in den Untermodulen fehl; daher der try/except-Guard.
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try:
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from sn_plan41.modules.vln_api_client import KartenApiClient, ApiError, AuthError
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from sn_plan41.modules.vln_layer_manager import (
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feature_collection_to_layers,
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plugin_layers,
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layers_to_feature_collection,
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layer_api_path,
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PROP_DATASET,
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PROP_VERFAHREN,
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)
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VLN_KARTEN_AVAILABLE = True
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except (ImportError, ModuleNotFoundError):
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KartenApiClient = None # type: ignore[assignment,misc]
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ApiError = Exception # type: ignore[assignment,misc]
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AuthError = Exception # type: ignore[assignment,misc]
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VLN_KARTEN_AVAILABLE = False
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# Geometrietyp-Konstanten (QGIS intern: 1 = Linie, 2 = Fläche)
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try:
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from qgis.core import Qgis as _Qgis
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_GEOM_LINE = _Qgis.GeometryType.Line
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_GEOM_POLYGON = _Qgis.GeometryType.Polygon
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except (ImportError, AttributeError):
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try:
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from qgis.core import QgsWkbTypes as _QgsWkbTypes
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_GEOM_LINE = _QgsWkbTypes.LineGeometry
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_GEOM_POLYGON = _QgsWkbTypes.PolygonGeometry
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except (ImportError, AttributeError):
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_GEOM_LINE = 1
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_GEOM_POLYGON = 2
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# Konstanten
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SETTINGS_GROUP = "vln_karten"
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PROJECT_SCOPE = "vln_karten"
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PROJECT_KEY_VKZ = "/vkz"
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P41_DATASET_KEY = "p41"
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P41_LABEL = "Plan 41 (Wege- und Gewässerplan)"
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P41_PATH_TEMPLATE = "/maps/p41/{vkz}"
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P41_GEOMETRY = "MultiPolygon"
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STYLE_FLAECHE = "QGIS_P41_API_Layer_flaeche.qml"
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STYLE_LINIE = "QGIS_P41_API_Layer_Linie.qml"
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class VlnApiLogic:
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"""
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Kapselt die VLN-API-Fachlogik für den Plan41-Tab.
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Alle Methoden, die Netzwerkkommunikation erfordern, können
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``ApiError`` oder ``AuthError`` werfen – die UI ist für die
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Fehlerdarstellung zuständig.
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"""
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def __init__(self, pruefmanager=None) -> None:
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self.pruefmanager = pruefmanager
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self._client: Optional[object] = None # KartenApiClient | None
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# API-Client aus gespeicherten Credentials initialisieren
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if VLN_KARTEN_AVAILABLE:
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api_key, mail = self.load_stored_credentials()
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if api_key:
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self._client = KartenApiClient(api_key=api_key, mail=mail)
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# ------------------------------------------------------------------
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# Verfügbarkeit
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# ------------------------------------------------------------------
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@staticmethod
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def is_available() -> bool:
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"""True, wenn die lokalen API-Module geladen werden konnten
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(erfordert eine QGIS-Laufzeitumgebung)."""
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return VLN_KARTEN_AVAILABLE
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# ------------------------------------------------------------------
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# Authentifizierungsstatus
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# ------------------------------------------------------------------
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@property
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def is_authenticated(self) -> bool:
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"""True, wenn ein gültiger API-Key vorhanden ist."""
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if self._client is None:
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return False
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return bool(getattr(self._client, "is_authenticated", False))
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@property
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def mail(self) -> Optional[str]:
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"""E-Mail-Adresse des angemeldeten Benutzers oder None."""
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if self._client is None:
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return None
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return getattr(self._client, "mail", None)
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# ------------------------------------------------------------------
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# QSettings: API-Key persistieren
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# ------------------------------------------------------------------
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def load_stored_credentials(self) -> tuple:
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"""Liest API-Key und Mail aus QSettings.
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Gibt ``(api_key, mail)`` zurück – leere Strings wenn nicht vorhanden.
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"""
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settings = QSettings()
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settings.beginGroup(SETTINGS_GROUP)
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api_key = settings.value("api_key", "")
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mail = settings.value("mail", "")
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settings.endGroup()
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return api_key or None, mail or None
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def save_api_key(self, api_key: str, mail: str) -> None:
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"""Speichert API-Key und Mail in QSettings."""
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settings = QSettings()
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settings.beginGroup(SETTINGS_GROUP)
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settings.setValue("api_key", api_key)
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settings.setValue("mail", mail or "")
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settings.endGroup()
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def clear_api_key(self) -> None:
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"""Entfernt API-Key aus QSettings."""
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settings = QSettings()
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settings.beginGroup(SETTINGS_GROUP)
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settings.remove("api_key")
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settings.endGroup()
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# ------------------------------------------------------------------
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# Login / Logout
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# ------------------------------------------------------------------
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def login(self, mail: str, password: str) -> None:
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"""
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Meldet den Benutzer an und speichert den API-Key.
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:raises ApiError: Bei ungültigen Zugangsdaten oder Netzwerkproblem.
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:raises RuntimeError: Wenn QGIS nicht verfügbar ist (kein qgis-Paket).
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"""
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if not VLN_KARTEN_AVAILABLE:
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raise RuntimeError(
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"VLN-API-Module nicht verfügbar (QGIS-Laufzeitumgebung benötigt)."
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)
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client = KartenApiClient()
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client.login(mail, password) # wirft ApiError bei Fehler
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self._client = client
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self.save_api_key(client.api_key, mail)
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def logout(self) -> None:
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"""Meldet den Benutzer ab (lokal, kein API-Aufruf)."""
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if self._client is not None:
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getattr(self._client, "logout", lambda: None)()
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self._client = None
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def handle_session_expired(self) -> None:
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"""
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Behandelt einen abgelaufenen API-Key:
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entfernt ihn aus QSettings und setzt den Client zurück.
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"""
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self.clear_api_key()
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self.logout()
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# ------------------------------------------------------------------
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# Verfahrensliste
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# ------------------------------------------------------------------
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def get_verfahren(self) -> list:
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"""
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Lädt alle Verfahren (TGs) vom Server.
|
||||
|
||||
:returns: Sortierte Liste von ``{"vkz": ..., "name": ...}``-Dicts.
|
||||
:raises AuthError: Wenn nicht angemeldet oder Session abgelaufen.
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:raises ApiError: Bei sonstigem Netzwerkfehler.
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"""
|
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if self._client is None:
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raise AuthError("Nicht angemeldet.")
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return self._client.get_verfahren()
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# ------------------------------------------------------------------
|
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# VKZ-Persistenz in Projektdatei
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||||
# ------------------------------------------------------------------
|
||||
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def load_stored_vkz(self) -> Optional[str]:
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"""Liest die zuletzt gewählte VKZ aus der Projektdatei."""
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try:
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||||
vkz, _ok = QgsProject.instance().readEntry(
|
||||
PROJECT_SCOPE, PROJECT_KEY_VKZ, ""
|
||||
)
|
||||
return vkz if vkz else None
|
||||
except Exception:
|
||||
return None
|
||||
|
||||
def save_vkz(self, vkz: Optional[str]) -> None:
|
||||
"""Schreibt die gewählte VKZ in die Projektdatei."""
|
||||
if not vkz:
|
||||
return
|
||||
try:
|
||||
QgsProject.instance().writeEntry(PROJECT_SCOPE, PROJECT_KEY_VKZ, vkz)
|
||||
except Exception:
|
||||
pass
|
||||
|
||||
# ------------------------------------------------------------------
|
||||
# Plan 41 laden
|
||||
# ------------------------------------------------------------------
|
||||
|
||||
def get_p41_layers(self, vkz: str) -> list:
|
||||
"""Gibt alle bereits geladenen P41-Layer für diese VKZ zurück."""
|
||||
return plugin_layers(P41_DATASET_KEY, vkz)
|
||||
|
||||
def remove_p41_layers(self, vkz: str) -> None:
|
||||
"""Entfernt alle P41-Layer dieser VKZ aus dem Projekt."""
|
||||
existing = plugin_layers(P41_DATASET_KEY, vkz)
|
||||
if existing:
|
||||
QgsProject.instance().removeMapLayers([l.id() for l in existing])
|
||||
|
||||
def load_p41(self, vkz: str) -> list:
|
||||
"""
|
||||
Lädt den Plan-41-Datensatz für eine VKZ vom Server und legt
|
||||
Memory-Layer im Projekt an. Auf die entstandenen Layer werden
|
||||
die passenden QML-Stile aus ``sn_plan41/assets/`` angewendet.
|
||||
|
||||
:returns: Liste der erzeugten ``QgsVectorLayer``.
|
||||
:raises AuthError: Wenn nicht angemeldet oder Session abgelaufen.
|
||||
:raises ApiError: Bei sonstigem Netzwerkfehler.
|
||||
:raises RuntimeError: Wenn QGIS nicht verfügbar ist.
|
||||
"""
|
||||
if not VLN_KARTEN_AVAILABLE:
|
||||
raise RuntimeError(
|
||||
"VLN-API-Module nicht verfügbar (QGIS-Laufzeitumgebung benötigt)."
|
||||
)
|
||||
if self._client is None:
|
||||
raise AuthError("Nicht angemeldet.")
|
||||
|
||||
path = P41_PATH_TEMPLATE.format(vkz=vkz)
|
||||
feature_collection = self._client.load_layer_complete(
|
||||
P41_DATASET_KEY, vkz
|
||||
)
|
||||
base_name = "%s %s" % (P41_LABEL, vkz)
|
||||
layers = feature_collection_to_layers(
|
||||
feature_collection,
|
||||
base_name,
|
||||
P41_GEOMETRY,
|
||||
P41_DATASET_KEY,
|
||||
vkz,
|
||||
path,
|
||||
)
|
||||
self._apply_p41_styles(layers)
|
||||
return layers
|
||||
|
||||
def _apply_p41_styles(self, layers: list) -> None:
|
||||
"""Wendet den passenden QML-Stil auf jeden Layer an."""
|
||||
assets_dir = join_path(get_plugin_root(), "sn_plan41", "assets")
|
||||
for layer in layers:
|
||||
try:
|
||||
gtype = layer.geometryType()
|
||||
except Exception:
|
||||
continue
|
||||
|
||||
if gtype == _GEOM_POLYGON:
|
||||
style_file = STYLE_FLAECHE
|
||||
elif gtype == _GEOM_LINE:
|
||||
style_file = STYLE_LINIE
|
||||
else:
|
||||
continue # Punkt- und None-Layer erhalten keinen Stil
|
||||
|
||||
style_path = join_path(assets_dir, style_file)
|
||||
apply_style_from_path(layer, style_path)
|
||||
|
||||
# ------------------------------------------------------------------
|
||||
# Upload
|
||||
# ------------------------------------------------------------------
|
||||
|
||||
def upload_active_layer(self, active_layer) -> tuple:
|
||||
"""
|
||||
Lädt alle Teil-Layer des aktiven Layers zum Server hoch.
|
||||
|
||||
:param active_layer: Aktiver ``QgsVectorLayer`` (aus ``iface.activeLayer()``).
|
||||
:returns: ``(success: bool, message: str)``
|
||||
:raises AuthError: Wenn Session abgelaufen.
|
||||
:raises ApiError: Bei Netzwerkfehler.
|
||||
"""
|
||||
if not VLN_KARTEN_AVAILABLE:
|
||||
return False, (
|
||||
"VLN-API-Module nicht verfügbar (QGIS-Laufzeitumgebung benötigt)."
|
||||
)
|
||||
|
||||
if self._client is None:
|
||||
raise AuthError("Nicht angemeldet.")
|
||||
|
||||
path = layer_api_path(active_layer) if active_layer else None
|
||||
if not path:
|
||||
return (
|
||||
False,
|
||||
"Der aktive Layer wurde nicht über 'vln_karten' geladen. "
|
||||
"Bitte einen Plan41-Layer aus dem Projekt auswählen.",
|
||||
)
|
||||
|
||||
dataset_key = active_layer.customProperty(PROP_DATASET)
|
||||
vkz = active_layer.customProperty(PROP_VERFAHREN)
|
||||
siblings = plugin_layers(dataset_key, vkz)
|
||||
|
||||
for layer in siblings:
|
||||
if layer.isEditable() and not layer.commitChanges():
|
||||
return (
|
||||
False,
|
||||
"Die Bearbeitungssitzung von '%s' konnte nicht "
|
||||
"gespeichert werden." % layer.name(),
|
||||
)
|
||||
|
||||
feature_collection = layers_to_feature_collection(siblings)
|
||||
self._client.save_feature_collection(path, feature_collection)
|
||||
|
||||
total = sum(layer.featureCount() for layer in siblings)
|
||||
return (
|
||||
True,
|
||||
"%d Objekte aus %d Layer(n) erfolgreich hochgeladen."
|
||||
% (total, len(siblings)),
|
||||
)
|
||||
|
||||
def upload_summary(self, active_layer) -> Optional[dict]:
|
||||
"""
|
||||
Gibt eine Zusammenfassung der zu hochladenden Layer zurück
|
||||
(für den Bestätigungs-Dialog in der UI), ohne den Upload
|
||||
tatsächlich auszuführen.
|
||||
|
||||
:returns: Dict mit ``dataset_label``, ``vkz``, ``siblings``
|
||||
(Layer-Liste), ``total`` (Objektanzahl), ``listing`` (str)
|
||||
oder ``None`` wenn kein gültiger Layer.
|
||||
"""
|
||||
if not VLN_KARTEN_AVAILABLE or active_layer is None:
|
||||
return None
|
||||
path = layer_api_path(active_layer)
|
||||
if not path:
|
||||
return None
|
||||
|
||||
dataset_key = active_layer.customProperty(PROP_DATASET)
|
||||
vkz = active_layer.customProperty(PROP_VERFAHREN)
|
||||
siblings = plugin_layers(dataset_key, vkz)
|
||||
|
||||
total = sum(l.featureCount() for l in siblings)
|
||||
listing = "\n".join(
|
||||
"• %s (%d Objekte)" % (l.name(), l.featureCount())
|
||||
for l in siblings
|
||||
)
|
||||
return {
|
||||
"dataset_label": P41_LABEL if dataset_key == P41_DATASET_KEY else dataset_key,
|
||||
"vkz": vkz,
|
||||
"siblings": siblings,
|
||||
"total": total,
|
||||
"listing": listing,
|
||||
}
|
||||
@@ -0,0 +1,177 @@
|
||||
"""Konvertierung GeoJSON <-> QGIS-Layer für die VLN-API.
|
||||
|
||||
Lokale Kopie des Layer-Managers aus dem vln_karten-Plugin — sn_plan41
|
||||
benötigt kein separat installiertes vln_karten-Plugin mehr.
|
||||
|
||||
Die API liefert je Layer (z.B. Plan 41) gemischte Geometrietypen in einer
|
||||
FeatureCollection: Punkte, Linien, Polygone sowie deren Multi-Varianten.
|
||||
QGIS-Memory-Layer können nur einen Geometrietyp halten — beim Laden wird
|
||||
deshalb nach Geometrie-Familie (Punkte/Linien/Flächen) in bis zu drei
|
||||
Layer gesplittet; Single-Geometrien werden zu Multi befördert.
|
||||
|
||||
Beim Hochladen müssen alle Teil-Layer desselben Datensatzes wieder zu
|
||||
EINER FeatureCollection vereint werden, weil der PUT der API den
|
||||
kompletten Layer-Bestand der VKZ ersetzt.
|
||||
|
||||
Custom-Properties an Layern (kompatibel mit vln_karten, falls beide
|
||||
Plugins gleichzeitig installiert sind):
|
||||
vln_karten/dataset — z.B. "p41"
|
||||
vln_karten/verfahren — VKZ-Nummer
|
||||
vln_karten/api_path — API-Pfad für Upload
|
||||
"""
|
||||
|
||||
import json
|
||||
|
||||
from sn_basis.functions.qgiscore_wrapper import (
|
||||
QgsJsonExporter,
|
||||
QgsJsonUtils,
|
||||
QgsProject,
|
||||
QgsVectorLayer,
|
||||
GEOM_POINT,
|
||||
GEOM_LINE,
|
||||
GEOM_POLYGON,
|
||||
)
|
||||
|
||||
_GEOM_POINT = GEOM_POINT
|
||||
_GEOM_LINE = GEOM_LINE
|
||||
_GEOM_POLYGON = GEOM_POLYGON
|
||||
|
||||
# Die VLN-API liefert Koordinaten in ETRS89 / UTM Zone 33 (EPSG:25833).
|
||||
GEOJSON_CRS = "EPSG:25833"
|
||||
|
||||
# Custom-Property-Schlüssel — identisch mit vln_karten für Kompatibilität.
|
||||
PROP_DATASET = "vln_karten/dataset"
|
||||
PROP_VERFAHREN = "vln_karten/verfahren"
|
||||
PROP_PATH = "vln_karten/api_path"
|
||||
|
||||
# Geometrie-Familie → (Memory-Provider-Typ, Namenszusatz).
|
||||
# Reihenfolge = Lade-Reihenfolge: Flächen zuerst, damit Punkte im
|
||||
# Layerbaum oben landen und nicht verdeckt werden.
|
||||
_FAMILIES = (
|
||||
("polygon", "MultiPolygon", "Flächen"),
|
||||
("line", "MultiLineString", "Linien"),
|
||||
("point", "MultiPoint", "Punkte"),
|
||||
("none", "None", "ohne Geometrie"),
|
||||
)
|
||||
|
||||
|
||||
def _family(feature):
|
||||
"""Geometrie-Familie eines Features. Unbekannte Typen (z.B.
|
||||
GeometryCollection) landen bei 'none'."""
|
||||
if not feature.hasGeometry() or feature.geometry().isNull():
|
||||
return "none"
|
||||
gtype = feature.geometry().type()
|
||||
if gtype == _GEOM_POINT:
|
||||
return "point"
|
||||
if gtype == _GEOM_LINE:
|
||||
return "line"
|
||||
if gtype == _GEOM_POLYGON:
|
||||
return "polygon"
|
||||
return "none"
|
||||
|
||||
|
||||
def memory_layer_from_features(
|
||||
uri_type, name, fields, features, dataset_key, verfahren_nr, api_path, promote=True
|
||||
):
|
||||
"""Baut einen Memory-Layer aus fertigen QgsFeatures, setzt die
|
||||
Plugin-Custom-Properties und hängt ihn ins Projekt."""
|
||||
uri = uri_type if uri_type == "None" else "%s?crs=%s" % (uri_type, GEOJSON_CRS)
|
||||
layer = QgsVectorLayer(uri, name, "memory")
|
||||
if not layer.isValid():
|
||||
raise RuntimeError("Memory-Layer '%s' konnte nicht erzeugt werden." % name)
|
||||
provider = layer.dataProvider()
|
||||
provider.addAttributes(fields.toList())
|
||||
layer.updateFields()
|
||||
prepared = []
|
||||
for feature in features:
|
||||
geometry = feature.geometry()
|
||||
if promote and not geometry.isNull() and not geometry.isMultipart():
|
||||
geometry.convertToMultiType()
|
||||
feature.setGeometry(geometry)
|
||||
prepared.append(feature)
|
||||
provider.addFeatures(prepared)
|
||||
layer.updateExtents()
|
||||
layer.setCustomProperty(PROP_DATASET, dataset_key)
|
||||
layer.setCustomProperty(PROP_VERFAHREN, verfahren_nr)
|
||||
layer.setCustomProperty(PROP_PATH, api_path)
|
||||
return layer
|
||||
|
||||
|
||||
def feature_collection_to_layers(
|
||||
feature_collection, base_name, default_geometry, dataset_key, verfahren_nr, api_path
|
||||
):
|
||||
"""Erzeugt aus einer GeoJSON FeatureCollection je vorkommender
|
||||
Geometrie-Familie einen Memory-Layer und hängt sie ins Projekt.
|
||||
Liefert die Liste der erzeugten Layer."""
|
||||
text = json.dumps(feature_collection)
|
||||
fields = QgsJsonUtils.stringToFields(text)
|
||||
features = QgsJsonUtils.stringToFeatureList(text, fields)
|
||||
|
||||
groups = {}
|
||||
for feature in features:
|
||||
groups.setdefault(_family(feature), []).append(feature)
|
||||
|
||||
layers = []
|
||||
multiple = len(groups) > 1
|
||||
|
||||
def make_layer(uri_type, name, group_features, promote):
|
||||
layers.append(
|
||||
memory_layer_from_features(
|
||||
uri_type, name, fields, group_features,
|
||||
dataset_key, verfahren_nr, api_path, promote=promote,
|
||||
)
|
||||
)
|
||||
|
||||
if not groups:
|
||||
# Leerer Datensatz: ein leerer Layer im Default-Typ, damit der
|
||||
# Nutzer digitalisieren und hochladen kann.
|
||||
make_layer(default_geometry, base_name, [], promote=False)
|
||||
else:
|
||||
for family, uri_type, suffix in _FAMILIES:
|
||||
if family not in groups:
|
||||
continue
|
||||
name = "%s — %s" % (base_name, suffix) if multiple else base_name
|
||||
make_layer(uri_type, name, groups[family], promote=(family != "none"))
|
||||
|
||||
QgsProject.instance().addMapLayers(layers)
|
||||
return layers
|
||||
|
||||
|
||||
def plugin_layers(dataset_key, verfahren_nr):
|
||||
"""Alle Layer im Projekt, die zu diesem Datensatz und dieser VKZ
|
||||
gehören (z.B. die Punkte-/Linien-/Flächen-Teil-Layer von Plan 41)."""
|
||||
result = []
|
||||
for layer in QgsProject.instance().mapLayers().values():
|
||||
if (
|
||||
isinstance(layer, QgsVectorLayer)
|
||||
and layer.customProperty(PROP_DATASET) == dataset_key
|
||||
and str(layer.customProperty(PROP_VERFAHREN)) == str(verfahren_nr)
|
||||
):
|
||||
result.append(layer)
|
||||
return result
|
||||
|
||||
|
||||
def layers_to_feature_collection(layers):
|
||||
"""Vereint die Features mehrerer Layer zu EINER GeoJSON
|
||||
FeatureCollection (für den PUT, der den Serverbestand ersetzt).
|
||||
|
||||
Keine Transformation nach WGS84: Die API erwartet die Koordinaten im
|
||||
selben CRS, in dem sie sie liefert (EPSG:25833)."""
|
||||
merged = []
|
||||
for layer in layers:
|
||||
exporter = QgsJsonExporter(layer)
|
||||
exporter.setSourceCrs(layer.crs())
|
||||
exporter.setTransformGeometries(False)
|
||||
collection = json.loads(
|
||||
exporter.exportFeatures(list(layer.getFeatures()))
|
||||
)
|
||||
merged.extend(collection.get("features", []))
|
||||
return {"type": "FeatureCollection", "features": merged}
|
||||
|
||||
|
||||
def layer_api_path(layer):
|
||||
"""API-Pfad, unter dem dieser Layer geladen wurde — oder None,
|
||||
wenn der Layer nicht von diesem Plugin stammt."""
|
||||
if not isinstance(layer, QgsVectorLayer):
|
||||
return None
|
||||
return layer.customProperty(PROP_PATH) or None
|
||||
Reference in New Issue
Block a user