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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def process_request(self, request):
 """ Process a Django request and authenticate users. If a JWT authentication header is detected and it is determined to be valid, the user is set as ``request.user`` and CSRF protection is disabled (``request._dont_enforce_csrf_checks = True``) on the request. :param request: Django Request instance """

        if 'HTTP_AUTHORIZATION' not in request.META:
            return

        try:
            method, claim = request.META['HTTP_AUTHORIZATION'].split(' ', 1)
        except ValueError:
            return

        if method.upper() != AUTH_METHOD:
            return

        username = token.get_claimed_username(claim)
        if not username:
            return

        User = get_user_model()
        try:
            user = User.objects.get(username=username)
        except User.DoesNotExist:
            return

        claim_data = None
        for public in user.public_keys.all():
            claim_data = token.verify(claim, public.key, validate_nonce=self.validate_nonce)
            if claim_data:
                break
        if not claim_data:
            return

        logger.debug('Successfully authenticated %s using JWT', user.username)
        request._dont_enforce_csrf_checks = True
        request.user = user