Backend

backend/app/core/auth.py

@@ -0,0 +1,62 @@
+# backend/app/core/auth.py
+from datetime import datetime, timedelta, timezone
+from typing import Optional
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+import jwt
+from jwt.exceptions import PyJWTError
+
+from .config import SECRET_KEY, ALGORITHM, ADMIN_USER
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="auth/token")
+oauth2_scheme_optional = OAuth2PasswordBearer(tokenUrl="auth/token", auto_error=False)
+
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.now(timezone.utc) + expires_delta
+    else:
+        expire = datetime.now(timezone.utc) + timedelta(minutes=15)
+
+    to_encode.update({"exp": expire})
+
+    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+
+async def get_current_user(token: str = Depends(oauth2_scheme)):
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        username = payload.get("sub")
+
+        if username is None or username != ADMIN_USER:
+            raise credentials_exception
+
+    except PyJWTError:
+        raise credentials_exception
+
+    return username
+
+
+async def get_optional_user(
+    token: Optional[str] = Depends(oauth2_scheme_optional),
+) -> Optional[str]:
+    if not token:
+        return None
+
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        username = payload.get("sub")
+        if username == ADMIN_USER:
+            return username
+    except Exception:
+        pass
+
+    return None