♻️(backend) merge room name regex and centralize patterns in enums

Combine the regex used in Drive with the one from the recording
feature and centralize them in the enums module.

Although the module name suggests only enums, it also hosts
shared constants used across the codebase.

src/backend/core/api/viewsets.py

@@ -1,7 +1,6 @@
 """API endpoints"""
 # pylint: disable=too-many-lines
 
-import re
 import uuid
 from logging import getLogger
 from urllib.parse import unquote, urlparse
@@ -34,6 +33,7 @@ from rest_framework import (
 
 from core import enums, models, utils
 from core.api.filters import ListFileFilter
+from core.enums import MEDIA_STORAGE_URL_PATTERN
 from core.recording.enums import FileExtension
 from core.recording.event.authentication import StorageEventAuthentication
 from core.recording.event.exceptions import (
@@ -78,16 +78,6 @@ from .feature_flag import FeatureFlag
 
 logger = getLogger(__name__)
 
-FILE_FOLDER = settings.FILE_UPLOAD_PATH
-UUID_REGEX = (
-    r"[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}"
-)
-FILE_EXT_REGEX = r"[\d\w]+"
-MEDIA_STORAGE_URL_PATTERN = re.compile(
-    f"{settings.MEDIA_URL:s}"
-    rf"(?P<key>{FILE_FOLDER:s}/(?P<pk>{UUID_REGEX:s})\.{FILE_EXT_REGEX:s})$"
-)
-
 
 class NestedGenericViewSet(viewsets.GenericViewSet):
     """

src/backend/core/enums.py

@@ -17,6 +17,12 @@ RECORDING_STORAGE_URL_PATTERN = re.compile(
     f"/media/{settings.RECORDING_OUTPUT_FOLDER}/(?P<recording_id>{UUID_REGEX:s}).(?P<extension>{FILE_EXT_REGEX:s})"
 )
 
+MEDIA_STORAGE_URL_PATTERN = re.compile(
+    f"{settings.MEDIA_URL:s}"
+    rf"(?P<key>{settings.FILE_UPLOAD_PATH:s}/(?P<pk>{UUID_REGEX:s})\.{FILE_EXT_REGEX:s})$"
+)
+
+
 # Django sets `LANGUAGES` by default with all supported languages. We can use it for
 # the choice of languages which should not be limited to the few languages active in
 # the app.