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core/security.py

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+from datetime import datetime, timedelta
+from typing import Optional
+from jose import JWTError, jwt
+import hashlib
+from fastapi import HTTPException, status, Depends
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from sqlalchemy.orm import Session
+import os
+
+from database.models import User
+from database.session import get_db
+
+# Security configuration
+SECRET_KEY = os.getenv("SECRET_KEY", "auranexus-secret-key-change-in-production")
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 30
+
+# For demo purposes, using a simple hash function
+# In production, use proper password hashing like bcrypt
+security = HTTPBearer()
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    # Simple hash comparison for demo purposes
+    return get_password_hash(plain_password) == hashed_password
+
+def get_password_hash(password: str) -> str:
+    # Simple hash for demo purposes
+    return hashlib.sha256(password.encode()).hexdigest()
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=15)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(security),
+    db: Session = Depends(get_db)
+) -> User:
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = jwt.decode(credentials.credentials, SECRET_KEY, algorithms=[ALGORITHM])
+        user_id: str = payload.get("sub")
+        if user_id is None:
+            raise credentials_exception
+    except JWTError:
+        raise credentials_exception
+    
+    user = db.query(User).filter(User.id == user_id).first()
+    if user is None:
+        raise credentials_exception
+    return user