move code to crs_utils (#84)

* move code to crs_utils

* typo

src/django_oapif/crs_utils.py

@@ -0,0 +1,56 @@
+import re
+
+from pyproj import CRS
+
+# taken from https://github.com/geopython/pygeoapi/blob/953b6fa74d2ce292d8f566c4f4d3bcb4161d6e95/pygeoapi/util.py#L90
+
+
+CRS_AUTHORITY = [
+ "AUTO",
+ "EPSG",
+ "OGC",
+]
+CRS_URI_PATTERN = re.compile(
+ (
+ rf"^http://www.opengis\.net/def/crs/"
+ rf"(?P<auth>{'|'.join(CRS_AUTHORITY)})/"
+ rf"[\d|\.]+?/(?P<code>\w+?)$"
+ )
+)
+
+
+def get_crs_from_uri(uri: str) -> CRS:
+ """
+ Get a `pyproj.CRS` instance from a CRS URI.
+ Author: @MTachon
+
+ :param uri: Uniform resource identifier of the coordinate
+ reference system.
+ :type uri: str
+
+ :raises `CRSError`: Error raised if no CRS could be identified from the
+ URI.
+
+ :returns: `pyproj.CRS` instance matching the input URI.
+ :rtype: `pyproj.CRS`
+ """
+
+ try:
+ crs = CRS.from_authority(*CRS_URI_PATTERN.search(uri).groups())
+ except RuntimeError:
+ msg = (
+ f"CRS could not be identified from URI {uri!r} "
+ f"(Authority: {CRS_URI_PATTERN.search(uri).group('auth')!r}, "
+ f"Code: {CRS_URI_PATTERN.search(uri).group('code')!r})."
+ )
+ raise RuntimeError(msg)
+ except AttributeError:
+ msg = (
+ f"CRS could not be identified from URI {uri!r}. CRS URIs must "
+ "follow the format "
+ "'http://www.opengis.net/def/crs/{authority}/{version}/{code}' "
+ "(see https://docs.opengeospatial.org/is/18-058r1/18-058r1.html#crs-overview)." # noqa
+ )
+ raise AttributeError(msg)
+ else:
+ return crs

src/django_oapif/decorators.py

@@ -1,4 +1,3 @@
-import re
 from os import getenv
 from typing import Any, Callable, Dict, Optional
 
@@ -12,61 +11,9 @@
 from django_oapif.mixins import OAPIFDescribeModelViewSetMixin
 from django_oapif.urls import oapif_router
 
+from .crs_utils import get_crs_from_uri
 from .filters import BboxFilterBackend
 
-# taken from https://github.com/geopython/pygeoapi/blob/953b6fa74d2ce292d8f566c4f4d3bcb4161d6e95/pygeoapi/util.py#L90
-CRS_AUTHORITY = [
- "AUTO",
- "EPSG",
- "OGC",
-]
-
-CRS_URI_PATTERN = re.compile(
- (
- rf"^http://www.opengis\.net/def/crs/"
- rf"(?P<auth>{'|'.join(CRS_AUTHORITY)})/"
- rf"[\d|\.]+?/(?P<code>\w+?)$"
- )
-)
-
-
-# taken from
-def get_crs_from_uri(uri: str) -> CRS:
- """
- Get a `pyproj.CRS` instance from a CRS URI.
- Author: @MTachon
-
- :param uri: Uniform resource identifier of the coordinate
- reference system.
- :type uri: str
-
- :raises `CRSError`: Error raised if no CRS could be identified from the
- URI.
-
- :returns: `pyproj.CRS` instance matching the input URI.
- :rtype: `pyproj.CRS`
- """
-
- try:
- crs = CRS.from_authority(*CRS_URI_PATTERN.search(uri).groups())
- except RuntimeError:
- msg = (
- f"CRS could not be identified from URI {uri!r} "
- f"(Authority: {CRS_URI_PATTERN.search(uri).group('auth')!r}, "
- f"Code: {CRS_URI_PATTERN.search(uri).group('code')!r})."
- )
- raise RuntimeError(msg)
- except AttributeError:
- msg = (
- f"CRS could not be identified from URI {uri!r}. CRS URIs must "
- "follow the format "
- "'http://www.opengis.net/def/crs/{authority}/{version}/{code}' "
- "(see https://docs.opengeospatial.org/is/18-058r1/18-058r1.html#crs-overview)." # noqa
- )
- raise AttributeError(msg)
- else:
- return crs
-
 
 def register_oapif_viewset(
  key: Optional[str] = None,