Python django.contrib.auth.hashers 模块，get_hasher() 实例源码

def identify_hasher(self, encoded):
        """
        Passlib replacement for identify_hasher() --
        Identify django hasher based on hash.
        """
        handler = self.context.identify(encoded, resolve=True, required=True)
        if handler.name == "django_salted_sha1" and encoded.startswith("sha1$$"):
            # Django uses a separate hasher for "sha1$$digest" hashes, but
            # passlib identifies it as belonging to "sha1$salt$digest" handler.
            # We want to resolve to correct django hasher.
            return self.get_hasher("unsalted_sha1")
        return self.passlib_to_django(handler)

    #=============================================================================
    # django.contrib.auth.hashers helpers -- password helpers
    #=============================================================================

def identify_hasher(self, encoded):
        """
        Passlib replacement for identify_hasher() --
        Identify django hasher based on hash.
        """
        handler = self.context.identify(encoded, resolve=True, required=True)
        if handler.name == "django_salted_sha1" and encoded.startswith("sha1$$"):
            # Django uses a separate hasher for "sha1$$digest" hashes, but
            # passlib identifies it as belonging to "sha1$salt$digest" handler.
            # We want to resolve to correct django hasher.
            return self.get_hasher("unsalted_sha1")
        return self.passlib_to_django(handler)

    #=============================================================================
    # django.contrib.auth.hashers helpers -- password helpers
    #=============================================================================

def _create_django_hasher(self, django_name):
        """
        helper to create new django hasher by name.
        wraps underlying django methods.
        """
        # if we haven't patched django, can use it directly
        module = sys.modules.get("passlib.ext.django.models")
        if module is None or not module.adapter.patched:
            from django.contrib.auth.hashers import get_hasher
            return get_hasher(django_name)

        # We've patched django's get_hashers(), so calling django's get_hasher()
        # or get_hashers_by_algorithm() would only land us back here.
        # As non-ideal workaround, have to use original get_hashers(),
        get_hashers = module.adapter._manager.getorig("django.contrib.auth.hashers:get_hashers").__wrapped__
        for hasher in get_hashers():
            if hasher.algorithm == django_name:
                return hasher

        # hardcode a few for cases where get_hashers() look won't work.
        path = self._builtin_django_hashers.get(django_name)
        if path:
            if "." not in path:
                path = "django.contrib.auth.hashers." + path
            from django.utils.module_loading import import_string
            return import_string(path)()

        raise ValueError("unknown hasher: %r" % django_name)

    #=============================================================================
    # reverse django -> passlib
    #=============================================================================

def get_hasher(self, algorithm="default"):
        """
        Passlib replacement for get_hasher() --
        Return django hasher by name
        """
        return self.resolve_django_hasher(algorithm)

def check(self, user, password):
    amount = int(get_channel_setting(user.channel.slug, "CANT_REUSE_LAST_PASSWORDS")[0])

    if amount:
      history = PasswordHistory.objects.filter(user=user).order_by('-id')[:amount]

      for item in history:
        algorithm = item.hashed_password.split("$")[0]
        hasher = get_hasher(algorithm=algorithm)
        matches = hasher.verify(password, item.hashed_password)

        if matches:
          raise serializers.ValidationError("You cannot reuse the last {} used passwords.".format(amount))

def _create_django_hasher(self, django_name):
        """
        helper to create new django hasher by name.
        wraps underlying django methods.
        """
        # if we haven't patched django, can use it directly
        module = sys.modules.get("passlib.ext.django.models")
        if module is None or not module.adapter.patched:
            from django.contrib.auth.hashers import get_hasher
            return get_hasher(django_name)

        # We've patched django's get_hashers(), so calling django's get_hasher()
        # or get_hashers_by_algorithm() would only land us back here.
        # As non-ideal workaround, have to use original get_hashers(),
        get_hashers = module.adapter._manager.getorig("django.contrib.auth.hashers:get_hashers").__wrapped__
        for hasher in get_hashers():
            if hasher.algorithm == django_name:
                return hasher

        # hardcode a few for cases where get_hashers() look won't work.
        path = self._builtin_django_hashers.get(django_name)
        if path:
            if "." not in path:
                path = "django.contrib.auth.hashers." + path
            from django.utils.module_loading import import_string
            return import_string(path)()

        raise ValueError("unknown hasher: %r" % django_name)

    #=============================================================================
    # reverse django -> passlib
    #=============================================================================

def get_hasher(self, algorithm="default"):
        """
        Passlib replacement for get_hasher() --
        Return django hasher by name
        """
        return self.resolve_django_hasher(algorithm)