refactor custom file lookup (#3536)

* refactor custom file lookup

* Rename function

InvenTree/InvenTree/config.py

@@ -7,6 +7,9 @@ import shutil
 import string
 from pathlib import Path
 
+from django.contrib.staticfiles.storage import StaticFilesStorage
+from django.core.files.storage import default_storage
+
 import yaml
 
 logger = logging.getLogger('inventree')
@@ -203,3 +206,27 @@ def get_secret_key():
     key_data = secret_key_file.read_text().strip()
 
     return key_data
+
+
+def get_custom_file(env_ref: str, conf_ref: str, log_ref: str, lookup_media: bool = False):
+    """Returns the checked path to a custom file.
+
+    Set lookup_media to True to also search in the media folder.
+    """
+    value = get_setting(env_ref, conf_ref, None)
+
+    if not value:
+        return None
+
+    static_storage = StaticFilesStorage()
+
+    if static_storage.exists(value):
+        logger.info(f"Loading {log_ref} from static directory: {value}")
+    elif lookup_media and default_storage.exists(value):
+        logger.info(f"Loading {log_ref} from media directory: {value}")
+    else:
+        add_dir_str = ' or media' if lookup_media else ''
+        logger.warning(f"The {log_ref} file '{value}' could not be found in the static{add_dir_str} directories")
+        value = False
+
+    return value

InvenTree/InvenTree/settings.py

@@ -16,8 +16,6 @@ import sys
 from pathlib import Path
 
 import django.conf.locale
-from django.contrib.staticfiles.storage import StaticFilesStorage
-from django.core.files.storage import default_storage
 from django.http import Http404
 from django.utils.translation import gettext_lazy as _
 
@@ -26,7 +24,7 @@ import sentry_sdk
 from sentry_sdk.integrations.django import DjangoIntegration
 
 from . import config
-from .config import get_boolean_setting, get_setting
+from .config import get_boolean_setting, get_custom_file, get_setting
 
 # Determine if we are running in "test" mode e.g. "manage.py test"
 TESTING = 'test' in sys.argv
@@ -818,37 +816,11 @@ PLUGIN_RETRY = CONFIG.get('PLUGIN_RETRY', 5)  # how often should plugin loading
 PLUGIN_FILE_CHECKED = False                    # Was the plugin file checked?
 
 # User interface customization values
+CUSTOM_LOGO = get_custom_file('INVENTREE_CUSTOM_LOGO', 'customize.logo', 'custom logo', lookup_media=True)
+CUSTOM_SPLASH = get_custom_file('INVENTREE_CUSTOM_SPLASH', 'customize.splash', 'custom splash')
+
 CUSTOMIZE = get_setting('INVENTREE_CUSTOMIZE', 'customize', {})
 
-static_storage = StaticFilesStorage()
-
-"""
-Check for the existence of a 'custom logo' file:
-- Check the 'static' directory
-- Check the 'media' directory (legacy)
-"""
-
-CUSTOM_LOGO = get_setting('INVENTREE_CUSTOM_LOGO', 'customize.logo', None)
-
-if CUSTOM_LOGO:
-    if static_storage.exists(CUSTOM_LOGO):
-        logger.info(f"Loading custom logo from static directory: {CUSTOM_LOGO}")
-    elif default_storage.exists(CUSTOM_LOGO):
-        logger.info(f"Loading custom logo from media directory: {CUSTOM_LOGO}")
-    else:
-        logger.warning(f"The custom logo file '{CUSTOM_LOGO}' could not be found in the static or media directories")
-        CUSTOM_LOGO = False
-
-# Check for a custom splash screen
-CUSTOM_SPLASH = get_setting('INVENTREE_CUSTOM_SPLASH', 'customize.splash', None)
-
-if CUSTOM_SPLASH:
-    if static_storage.exists(CUSTOM_SPLASH):
-        logger.info(f"Loading custom splash screen from static directory: {CUSTOM_SPLASH}")
-    else:
-        logger.warning(f"The custom splash screen '{CUSTOM_SPLASH}' could not be found in the static directory")
-        CUSTOM_SPLASH = False
-
 if DEBUG:
     logger.info("InvenTree running with DEBUG enabled")