auth begin

backend/auth.py

@@ -0,0 +1,72 @@
+import os
+from datetime import datetime, timedelta, timezone
+from typing import Optional
+
+import bcrypt
+import jwt
+from jwt.exceptions import PyJWTError
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from sqlalchemy.orm import Session
+
+import database
+import models
+
+
+SECRET = os.getenv("GYM_JWT_SECRET", "dev-secret-change-me")
+ALGORITHM = "HS256"
+EXPIRE_DAYS = int(os.getenv("GYM_JWT_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(password: str, hashed: str) -> bool:
+    try:
+        return bcrypt.checkpw(password.encode("utf-8"), hashed.encode("utf-8"))
+    except ValueError:
+        return False
+
+
+def create_access_token(user: models.User) -> str:
+    now = datetime.now(timezone.utc)
+    payload = {
+        "sub": str(user.id),
+        "username": user.username,
+        "iat": int(now.timestamp()),
+        "exp": int((now + timedelta(days=EXPIRE_DAYS)).timestamp()),
+    }
+    return jwt.encode(payload, SECRET, algorithm=ALGORITHM)
+
+
+def get_current_user(
+    credentials: Optional[HTTPAuthorizationCredentials] = Depends(bearer_scheme),
+    db: Session = Depends(database.get_db),
+) -> models.User:
+    if credentials is None or not credentials.credentials:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Not authenticated",
+        )
+
+    try:
+        payload = jwt.decode(credentials.credentials, SECRET, algorithms=[ALGORITHM])
+        user_id = int(payload["sub"])
+    except (PyJWTError, KeyError, ValueError):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Invalid token",
+        )
+
+    user = db.query(models.User).filter(models.User.id == user_id).first()
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="User not found",
+        )
+
+    return user