Refactor architecture documentation and enhance security features

- Updated architecture constraints documentation to include detailed sections on technical, organizational, regulatory, environmental, and performance constraints.
- Created separate markdown files for each type of constraint for better organization and clarity.
- Revised the architecture scope section to provide a clearer overview of the system's key areas.
- Enhanced the solution strategy documentation with detailed explanations of the client-server architecture, technology choices, trade-offs, and future considerations.
- Added comprehensive descriptions of backend and frontend components, middleware, and utilities in the architecture documentation.
- Migrated UI, templates, and styling notes to a dedicated section for better structure.
- Updated requirements.txt to include missing dependencies.
- Refactored user authentication logic in the users.py and security.py files to improve code organization and maintainability, including the integration of OAuth2 password bearer token handling.

routes/users.py

@@ -1,40 +1,15 @@
 from fastapi import APIRouter, Depends, HTTPException, status
-from fastapi.security import OAuth2PasswordBearer
 from sqlalchemy.orm import Session
 
 from config.database import get_db
 from models.user import User
-from services.security import get_password_hash, verify_password, create_access_token, SECRET_KEY, ALGORITHM
+from services.security import get_password_hash, verify_password, create_access_token, SECRET_KEY, ALGORITHM, get_current_user, oauth2_scheme
 from jose import jwt, JWTError
 from schemas.user import UserCreate, UserInDB, UserLogin, UserUpdate, PasswordResetRequest, PasswordReset, Token
 
 router = APIRouter(prefix="/users", tags=["users"])
 
 
-oauth2_scheme = OAuth2PasswordBearer(tokenUrl="users/login")
-
-
-async def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)):
-    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
-        if username is None:
-            raise credentials_exception
-    except JWTError:
-        raise credentials_exception
-    user = db.query(User).filter(User.username == username).first()
-    if user is None:
-        raise credentials_exception
-    return user
-
-
 @router.post("/register", response_model=UserInDB, status_code=status.HTTP_201_CREATED)
 async def register_user(user: UserCreate, db: Session = Depends(get_db)):
     db_user = db.query(User).filter(User.username == user.username).first()