Initial: Pokedexter TCG-Collector webapp

backend/app/auth.py

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+import os
+import bcrypt
+from datetime import datetime, timedelta, timezone
+from jose import JWTError, jwt
+from fastapi import Depends, HTTPException, status, Request
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+from .database import get_db
+from .models import User
+
+SECRET_KEY = os.getenv("SECRET_KEY", "skift-mig-til-en-sikker-noegle")
+ALGORITHM = "HS256"
+TOKEN_EXPIRE_DAYS = 30
+
+bearer_scheme = HTTPBearer(auto_error=False)
+
+
+def hash_password(password: str) -> str:
+    return bcrypt.hashpw(password.encode("utf-8"), bcrypt.gensalt()).decode("utf-8")
+
+
+def verify_password(plain: str, hashed: str) -> bool:
+    return bcrypt.checkpw(plain.encode("utf-8"), hashed.encode("utf-8"))
+
+
+def create_token(username: str, role: str) -> str:
+    expire = datetime.now(timezone.utc) + timedelta(days=TOKEN_EXPIRE_DAYS)
+    payload = {"sub": username, "role": role, "exp": expire}
+    return jwt.encode(payload, SECRET_KEY, algorithm=ALGORITHM)
+
+
+def decode_token(token: str) -> dict | None:
+    try:
+        return jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+    except JWTError:
+        return None
+
+
+async def get_current_user(
+    request: Request,
+    credentials: HTTPAuthorizationCredentials | None = Depends(bearer_scheme),
+    db: AsyncSession = Depends(get_db),
+) -> User | None:
+    """Return the current user, or None if not authenticated.
+    Checks both Authorization header and cookie."""
+    token = None
+    if credentials:
+        token = credentials.credentials
+    if not token:
+        token = request.cookies.get("token")
+    if not token:
+        return None
+    payload = decode_token(token)
+    if not payload:
+        return None
+    result = await db.execute(select(User).where(User.username == payload["sub"]))
+    return result.scalar_one_or_none()
+
+
+async def require_admin(user: User | None = Depends(get_current_user)) -> User:
+    if not user or user.role != "admin":
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Admin login required",
+        )
+    return user