Introduction

JWT utilities module for Ellar.

Installation

$(venv) pip install ellar-jwt

Usage

Import JWTModule:

from ellar.common import Module
from ellar_jwt import JWTModule


@Module(
    modules=[JWTModule.setup(signing_secret_key='my_private_key')]
)
class AuthModule:
    pass

Inject JWTService where its needed as shown below

from ellar_jwt import JWTService
from ellar.di import injectable


@injectable()
class AuthService:
  def __init__(self, jwt_service: JWTService) -> None:
    self.jwt_service = jwt_service

  async def sign_in(self, username: str, password: str) -> t.Dict:
      user = await self.user_service.find_one(username)
      if user.password != credentials.password:
          raise HTTPException(status_code=status.HTTP_403_FORBIDDEN)

      return {
          'access_token': await self.jwt_service.sign_async(user.dict())
      }

JWTModule Setup

There are two ways in config JWTModule

• setup:

  JWTModule.setup takes some parameters that allows instant configuration of the JWTConfiguration schema required by the JWTService

  For example:

  from ellar.common import Module
  from ellar_jwt import JWTModule
  
  
  @Module(
      modules=[JWTModule.setup(signing_secret_key='my_private_key', issuer='https://google.com')]
  )
  class AuthModule:
      pass

• register:

  JWTModule.register lets you provide JWT configuration in the Ellar application config object using the JWT_CONFIG key. The register function will create a ModuleSetup object that will inject application config to a JWT config factory

  for example:

  # config.py
  import json
  from datetime import timedelta
  
  class DevelopmentConfig:
      JWT_CONFIG = {
          'algorithm':"HS256", # allow_algorithms=["HS256","HS384","HS512","RS256","RS384","RS512","ES256","ES384","ES512"]
          'leeway': 0, # t.Union[float, int, timedelta]
      
          'signing_secret_key': 'secret', # secret or private key
          'verifying_secret_key': "", # public key
          'audience': None,
      
          'issuer': None,
          'jwk_url': None,
      
          'jti': "jti",
          'lifetime': timedelta(minutes=5), # token lifetime, this will example in 5 mins
      
          'json_encoder':json.JSONEncoder # token lifetime, this will be an example 
      }

  In auth/module.py

  from ellar.common import Module
  from ellar_jwt import JWTModule
      
      
  @Module(
      modules=[JWTModule.register_setup()]
  )
  class AuthModule:
      pass

JWT Configuration Options

import json
from datetime import timedelta


JWT_CONFIG = {
    'algorithm':"HS256", # allow_algorithms=["HS256","HS384","HS512","RS256","RS384","RS512","ES256","ES384","ES512"]
    'leeway': 0, # t.Union[float, int, timedelta]

    'signing_secret_key': 'secret', # secret or private key
    'verifying_secret_key': "", # public key
    'audience': None,

    'issuer': None,
    'jwk_url': None,

    'jti': "jti",
    'lifetime': timedelta(minutes=5), # token lifetime, this will example in 5 mins

    'json_encoder':json.JSONEncoder # token lifetime, this will be an example 
}

• lifetime

A datetime.timedelta object is employed to define the validity duration of the tokens. When generating a token, this timedelta value is combined with the present UTC time to establish the default exp claim value for the token.

• algorithm

The chosen algorithm from the PyJWT library governs the signing and verification procedures for tokens. For symmetric HMAC signing and verification, you have the option to use the following algorithms: HS256, HS384, and HS512. In the case of an HMAC algorithm, the signing_secret_key serves both as the signing and verifying key, rendering the verifying_secret_key setting redundant. On the other hand, for asymmetric RSA signing and verification, you can opt for the following algorithms: RS256, RS384, and RS512. In this scenario, selecting an RSA algorithm mandates configuring the signing_secret_key setting with an RSA private key string. Correspondingly, the verifying_secret_key setting must contain an RSA public key string

• signing_secret_key

The signing key utilized for signing the content of generated tokens has distinct requirements based on the signing protocol. For HMAC signing, it should be a randomly generated string containing at least as many bits as dictated by the signing protocol. Conversely, an RSA signing should be a string encompassing an RSA private key with a length of 2048 bits or more. As Simple JWT defaults to 256-bit HMAC signing, the signing_secret_key setting automatically takes on the value of your Django project's SECRET_KEY. While this default is practical, developers should modify this setting to a value separate from the Django project's secret key. This adjustment facilitates easier token signing key changes if the key is ever compromised.

• verifying_secret_key

The verification key is employed to authenticate the contents of generated tokens. In case an HMAC algorithm is indicated by the algorithm setting, the verifying_secret_key configuration is disregarded, and the signing_secret_key setting value will be utilized. However, if an RSA algorithm is designated by the algorithm setting, the verifying_secret_key parameter must be populated with an RSA public key string

• audience

The audience claim is incorporated into generated tokens and/or verified within decoded tokens. If configured as None, this element is omitted from tokens and isn't subjected to validation.

• issuer

The issuer claim is added to generated tokens and/or validated within decoded tokens. If configured as None, this attribute is omitted from tokens and isn't subjected to validation.

• jwk_url

The JWK_URL serves the purpose of dynamically retrieving the required public keys for token signature verification. For instance, with Auth0, you could configure it as 'https://yourdomain.auth0.com/.well-known/jwks.json'. If set to None, this field is omitted from the token backend and remains inactive during validation.

• leeway

Leeway provides a buffer for the expiration time, which can be defined as an integer representing seconds or a datetime.timedelta object. For further details, please consult the following link: https://pyjwt.readthedocs.io/en/latest/usage.html#expiration-time-claim-exp

• jti

The claim is designated for storing a token's unique identifier, which is utilized to distinguish revoked tokens within the blacklist application. There might be instances where an alternative claim other than the default "jti" claim needs to be employed for storing this value

• json_encoder

JSON Encoder class that will be used by the PYJWT to encode the jwt_payload.

API Spec

The JwtService uses PYJWT underneath.

jwt_service.sign(payload: dict, headers: Dict[str, t.Any] = None, **jwt_config: t.Any) -> str

Creates a jwt token for the provided payload. Also, you can override the default jwt config by using passing some keyword argument as a jwt_config

jwt_service.sign_async(payload: dict, headers: Dict[str, t.Any] = None, **jwt_config: t.Any) -> str

Async action for jwt_service.sign

jwt_service.decode(token: str, verify: bool = True, **jwt_config: t.Any) -> t.Dict[str, t.Any]:

Verifies and decodes provided token. And raises a JWTException exception if the token is invalid or expired

jwt_service.decode_async(token: str, verify: bool = True, **jwt_config: t.Any) -> t.Dict[str, t.Any]:

Async action for jwt_service.decode

License

Ellar is MIT licensed.