Allow hashed refresh tokens

[mongkok]

Hash refresh tokens before save:

import hashlib

from django.db.models.signals import pre_save
from django.dispatch import receiver

from graphql_jwt.settings import jwt_settings


@receiver(pre_save, sender=jwt_settings.JWT_REFRESH_TOKEN_MODEL)
def hash_refresh_token(sender, instance, **kwargs):
    if not instance.pk:
        instance.token = hashlib.sha512(instance.token.encode()).hexdigest()

Hash refresh tokens before get instances:

import hashlib

from graphql_jwt.refresh_token.utils import get_refresh_token_by_model


def get_refresh_token(refresh_token_model, token, context=None):
    token = hashlib.sha512(token.encode()).hexdigest()
    return get_refresh_token_by_model(refresh_token_model, token, context)

Configure JWT settings:

GRAPHQL_JWT = {
    'JWT_VERIFY_EXPIRATION': True,
    'JWT_LONG_RUNNING_REFRESH_TOKEN': True,
    'JWT_GET_REFRESH_TOKEN_HANDLER': 'mysite.get_refresh_token',
}

Edit: renamed handler function

[codecov-io]

Codecov Report

Merging #57 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #57   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          16     16           
  Lines         331    275   -56     
  Branches       40     30   -10     
=====================================
- Hits          331    275   -56

Impacted Files	Coverage Δ
graphql_jwt/refresh_token/shortcuts.py	100% <100%> (ø)	⬆️
...t/refresh_token/management/commands/cleartokens.py	100% <100%> (ø)	⬆️
graphql_jwt/refresh_token/models.py	100% <100%> (ø)	⬆️
graphql_jwt/refresh_token/utils.py	100% <100%> (ø)
graphql_jwt/utils.py

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