fix: LEAP-38: Rework secret key generation to use data volume more re…

…liably (#4716)

fix: LEAP-38: rework secret key generation to use data volume more reliably (#4713)

* fix: LEAP-38: rework secret key generation to use data volume more reliably

* remove key name param

* Update label_studio/core/utils/secret_key.py

---------

Co-authored-by: Jo Booth <jo.m.booth@gmail.com>

label_studio/core/settings/base.py

@@ -74,8 +74,9 @@
 if not logging.getLogger().hasHandlers():
     logging.basicConfig(level=logging.DEBUG, format='%(message)s')
 
-from label_studio.core.utils.io import get_data_dir, generate_key_if_missing
+from label_studio.core.utils.io import get_data_dir
 from label_studio.core.utils.params import get_bool_env, get_env, get_env_list_int
+from label_studio.core.utils.secret_key import generate_secret_key_if_missing
 
 logger = logging.getLogger(__name__)
 SILENCED_SYSTEM_CHECKS = []
@@ -104,9 +105,6 @@
 
 INTERNAL_PORT = '8080'
 
-# SECURITY WARNING: keep the secret key used in production secret!
-SECRET_KEY = generate_key_if_missing('SECRET_KEY')
-
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = get_bool_env('DEBUG', True)
 DEBUG_MODAL_EXCEPTIONS = get_bool_env('DEBUG_MODAL_EXCEPTIONS', True)
@@ -119,6 +117,9 @@
 os.makedirs(BASE_DATA_DIR, exist_ok=True)
 logger.info('=> Database and media directory: %s', BASE_DATA_DIR)
 
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = generate_secret_key_if_missing(BASE_DATA_DIR)
+
 # Databases
 # https://docs.djangoproject.com/en/2.1/ref/settings/#databases
 DJANGO_DB_MYSQL = 'mysql'

label_studio/core/utils/io.py

@@ -16,9 +16,6 @@
 from contextlib import contextmanager
 from tempfile import mkstemp, mkdtemp
 
-from django.conf import settings
-from django.core.management.utils import get_random_secret_key
-from label_studio.core.utils.params import env, env_file
 from appdirs import user_config_dir, user_data_dir, user_cache_dir
 
 # full path import results in unit test failures
@@ -210,20 +207,3 @@ def validate_upload_url(url, block_local_urls=True):
     for subnet in local_subnets:
         if ipaddress.ip_address(ip) in ipaddress.ip_network(subnet):
             raise InvalidUploadUrlError
-
-def generate_key_if_missing(key):
-    value = env.str(key, "")
-
-    if value == "":
-        print(f'Warning: {key} not found in environment variables will generate a random key.')
-        value = get_random_secret_key()
-        try:
-            with open(env_file, 'a') as f:
-                f.write(f'\n{key}={value}\n')
-        except Exception as e:
-            print(f'Warning: failed to write {key} to .env file: {e}, new key will be regenerated on every server restart. If this key is used for signing, it will invalidate all existing sessions or tokens. Please set {key} in your environment variables to avoid this warning.')
-
-        os.environ[key] = value
-
-    return value
-

label_studio/core/utils/params.py

@@ -1,14 +1,8 @@
 import os
-import environ
 
 from rest_framework.exceptions import ValidationError
 
 
-env = environ.Env()
-data_dir = os.environ.get('LABEL_STUDIO_DATA_DIR', os.path.join(os.path.dirname(__file__), '..', '..', '..', 'data'))
-env_file = os.path.join(data_dir, '.env')
-environ.Env.read_env(env_file)
-
 def cast_bool_from_str(value):
     if isinstance(value, str):
         if value.lower() in ['true', 'yes', 'on', '1']:

label_studio/core/utils/secret_key.py

@@ -0,0 +1,28 @@
+import logging
+import os
+import environ
+from django.core.management.utils import get_random_secret_key
+
+
+logger = logging.getLogger(__name__)
+
+
+def generate_secret_key_if_missing(data_dir: str) -> str:
+    env_key = 'SECRET_KEY'
+    env = environ.Env()
+    env_filepath = os.path.join(data_dir, '.env')
+    environ.Env.read_env(env_filepath)
+
+    if existing_secret := env.str(env_key, ""):
+        return existing_secret
+
+    logger.warning(f'Warning: {env_key} not found in environment variables. Will generate a random key.')
+    new_secret = get_random_secret_key()
+    try:
+        with open(env_filepath, 'a') as f:
+            f.write(f'\n{env_key}={new_secret}\n') # nosec
+    except Exception as e:
+        logger.warning(f'Warning: failed to write {env_key} to .env file: {e}, new key will be regenerated on every server restart. If this key is used for signing, it will invalidate all existing sessions or tokens. Please set {key} in your environment variables to avoid this warning.')
+
+    os.environ[env_key] = new_secret
+    return new_secret