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config/env.py

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+import os
+import re
+from pathlib import Path
+
+
+_ENV_NAME = re.compile(r"^[A-Za-z_][A-Za-z0-9_]*$")
+
+
+def load_env_file(path: Path) -> bool:
+    """Load a simple dotenv file without overriding the process environment."""
+    path = Path(path)
+    if not path.is_file():
+        return False
+    for raw_line in path.read_text(encoding="utf-8-sig").splitlines():
+        line = raw_line.strip()
+        if not line or line.startswith("#"):
+            continue
+        if line.startswith("export "):
+            line = line[7:].lstrip()
+        key, separator, value = line.partition("=")
+        key = key.strip()
+        if not separator or not _ENV_NAME.fullmatch(key):
+            continue
+        value = value.strip()
+        if len(value) >= 2 and value[0] == value[-1] and value[0] in {'"', "'"}:
+            value = value[1:-1]
+        os.environ.setdefault(key, value)
+    return True
+
+
+def load_project_environment(base_dir: Path) -> Path | None:
+    """Select local/production dotenv while preserving injected server secrets."""
+    base_dir = Path(base_dir)
+    explicit = os.environ.get("DJANGO_ENV_FILE", "").strip()
+    if explicit:
+        selected = Path(explicit)
+        if not selected.is_absolute():
+            selected = base_dir / selected
+    else:
+        settings_module = os.environ.get("DJANGO_SETTINGS_MODULE", "")
+        selected = base_dir / (".env.local" if settings_module.endswith(".dev") else ".env")
+    load_env_file(selected)
+    return selected if selected.is_file() else None