adding base project

app/core/deps.py

@@ -0,0 +1,34 @@
+from typing import Generator, Optional
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from sqlalchemy.orm import Session
+from app.core.database import SessionLocal
+from app.core.security import decode_access_token
+
+security = HTTPBearer(auto_error=False)
+
+def get_db() -> Generator:
+    """Dependency that yields a database session and ensures closure."""
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+def get_current_user_token(credentials: Optional[HTTPAuthorizationCredentials] = Depends(security)) -> Optional[dict]:
+    """Extracts and verifies JWT token payload from Authorization header."""
+    if not credentials:
+        return None
+    token = credentials.credentials
+    payload = decode_access_token(token)
+    return payload
+
+def require_current_user(payload: Optional[dict] = Depends(get_current_user_token)) -> dict:
+    """Ensures request is authenticated with a valid token."""
+    if not payload:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Could not validate credentials or token expired",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    return payload