refactor: split flask app structure

app/config.py

@@ -0,0 +1,50 @@
+from __future__ import annotations
+
+import os
+import secrets
+from pathlib import Path
+
+BASE_DIR = Path(__file__).resolve().parent.parent
+DATA_DIR = BASE_DIR / "data"
+STATIC_DIR = BASE_DIR / "static"
+UPLOAD_DIR = BASE_DIR / "uploads"
+IMAGE_DIR = STATIC_DIR / "images"
+
+
+def env_int(name: str, default: int) -> int:
+    try:
+        return int(os.environ.get(name, str(default)))
+    except ValueError:
+        return default
+
+
+def env_bool(name: str, default: bool = False) -> bool:
+    value = os.environ.get(name)
+    if value is None:
+        return default
+    return value.strip().lower() in {"1", "true", "yes", "on"}
+
+
+class Config:
+    SECRET_KEY = os.environ.get("SECRET_KEY") or secrets.token_hex(32)
+    SECRET_KEY_GENERATED = not bool(os.environ.get("SECRET_KEY"))
+    SQLALCHEMY_DATABASE_URI = os.environ.get(
+        "DATABASE_URL",
+        f"sqlite:///{DATA_DIR / 'pipe_survival_0331.db'}",
+    )
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+    MAX_CONTENT_LENGTH = env_int("MAX_UPLOAD_BYTES", 16 * 1024 * 1024)
+    SESSION_COOKIE_HTTPONLY = True
+    SESSION_COOKIE_SAMESITE = "Lax"
+    MODEL_PATH = os.environ.get(
+        "MODEL_PATH",
+        str(BASE_DIR / "my_survival_forest_model_quxi-10-0331.joblib"),
+    )
+    ALLOW_REGISTRATION = env_bool("ALLOW_REGISTRATION", False)
+    ADMIN_USERNAME = os.environ.get("ADMIN_USERNAME", "admin").strip() or "admin"
+    ADMIN_PASSWORD = os.environ.get("ADMIN_PASSWORD")
+
+
+def ensure_dirs() -> None:
+    for path in (DATA_DIR, STATIC_DIR, IMAGE_DIR, UPLOAD_DIR):
+        path.mkdir(parents=True, exist_ok=True)