Password hashing example — Dependency Injector 4.46.0 documentation (original) (raw)

This example demonstrates an injection of the Callable provider.

The source code is available on the Github.

Sample code¶

Listing of the pattern example:

"""Password hashing example."""

from typing import Callable, Dict

import passlib.hash

from dependency_injector import containers, providers

class UserService:

def __init__(self, password_hasher: Callable[[str], str]) -> None:
    self._password_hasher = password_hasher

def create_user(self, name: str, password: str) -> Dict[str, str]:
    hashed_password = self._password_hasher(password)
    return {
        "name": name,
        "password": hashed_password,
    }

class Container(containers.DeclarativeContainer):

config = providers.Configuration()

password_hasher = providers.Callable(
    passlib.hash.sha256_crypt.hash,
    salt_size=config.salt_size,
    rounds=config.rounds,
)

user_service = providers.Factory(
    UserService,
    password_hasher=password_hasher.provider,
)

if name == "main": container = Container( config={ "salt_size": 16, "rounds": 10000, }, )

user_service = container.user_service()

user = user_service.create_user(name="Roman", password="secret1")
print(user)

Run the example¶

Instructions for running: