♻️(backend) encapsulate recording key and extension logic as properties

Move logic for calculating recording keys and file extensions into proper
properties on recording objects. Simplifies access to Minio storage keys
and clearly documents expected behavior when saving recordings across the
application.

src/backend/core/models.py

@@ -18,6 +18,8 @@ from django.utils.translation import gettext_lazy as _
 
 from timezone_field import TimeZoneField
 
+from .recording.enums import FileExtension
+
 logger = getLogger(__name__)
 
 
@@ -576,6 +578,21 @@ class Recording(BaseModel):
             RecordingStatusChoices.STOPPED,
         }
 
+    @property
+    def extension(self):
+        """Get recording extension based on its mode."""
+        extensions = {
+            RecordingModeChoices.TRANSCRIPT: FileExtension.OGG.value,
+            RecordingModeChoices.SCREEN_RECORDING: FileExtension.MP4.value,
+        }
+        return extensions.get(self.mode, FileExtension.MP4.value)
+
+    @property
+    def key(self):
+        """Generate the file key based on recording mode."""
+
+        return f"{settings.RECORDING_OUTPUT_FOLDER}/{self.id}.{self.extension}"
+
 
 class RecordingAccess(BaseAccess):
     """Relation model to give access to a recording for a user or a team with a role."""