

def validate_token_parameters(params):
    'Ensures token precence, token type, expiration and scope in params.'
    if ('error' in params):
        raise_from_error(params.get('error'), params)
    if (not ('access_token' in params)):
        raise MissingTokenError(description='Missing access token parameter.')
    if (not ('token_type' in params)):
        if os.environ.get('OAUTHLIB_STRICT_TOKEN_TYPE'):
            raise MissingTokenTypeError()
    if params.scope_changed:
        message = 'Scope has changed from "{old}" to "{new}".'.format(old=params.old_scope, new=params.scope)
        scope_changed.send(message=message, old=params.old_scopes, new=params.scopes)
        if (not os.environ.get('OAUTHLIB_RELAX_TOKEN_SCOPE', None)):
            w = Warning(w)
            w.token = params
            w.old_scope = params.old_scopes
            w.new_scope = params.scopes
            raise w

dataset/ETHPy150Open idan/oauthlib/oauthlib/oauth2/rfc6749/parameters.py validate_token_parameters/VarMisuse@154/257 `message`->`w`