def get_signature_from_signature_string(self, signature):
        match = self.SIGNATURE_RE.search(signature)
        if not match:
            return None
        return match.group(1)
Return the signature from the signature header or None.
dataset/ETHPy150Open etoccalino/django-rest-framework-httpsignature/rest_framework_httpsignature/authentication.py/SignatureAuthentication.get_signature_from_signature_string