admin login

app/internal/auth.py

@@ -0,0 +1,53 @@
+from datetime import datetime, timedelta, timezone
+from pwdlib import PasswordHash
+import jwt
+from jwt.exceptions import InvalidTokenError
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from sqlmodel import Session, select
+
+from app.core.database import get_session
+from app.internal.models import Admin
+
+SECRET_KEY = "CHANGE_THIS_IN_PRODUCTION"
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 30
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="admin/login")
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return PasswordHash.recommended().verify(plain_password, hashed_password)
+
+def hash_password(password: str) -> str:
+    return PasswordHash.recommended().hash(password)
+
+
+def create_access_token(data: dict, expires_delta: timedelta | None = None) -> str:
+    to_encode = data.copy()
+    expire = datetime.now(timezone.utc) + (expires_delta or timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES))
+    to_encode.update({"exp": expire})
+    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+
+def get_current_admin_user(
+    token: str = Depends(oauth2_scheme),
+    session: Session = Depends(get_session)
+):
+    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: str = payload.get("sub")
+        if username is None:
+            raise credentials_exception
+    except InvalidTokenError:
+        raise credentials_exception
+
+    admin_user = session.exec(select(Admin).where(Admin.username == username)).first()
+    if not admin_user:
+        raise credentials_exception
+    return admin_user
+