| """Load only the explicitly allowed, hash-verified local preprocessing code.""" | |
| import hashlib | |
| import importlib | |
| from pathlib import Path | |
| ROOT=Path(__file__).resolve().parent | |
| ALLOWED={'command_normalizer':set(),'command_canonicalizer':{'command_normalizer.py'},'command_normalizer_v2':set(),'command_canonicalizer_v2':{'command_normalizer_v2.py'}} | |
| def load_preprocessor(metadata): | |
| name=metadata.get('module') | |
| if name not in ALLOWED:raise ValueError('Unrecognized input preprocessing module') | |
| file=ROOT/(name+'.py') | |
| if hashlib.sha256(file.read_bytes()).hexdigest()!=metadata.get('sha256'):raise ValueError('Input preprocessing source mismatch') | |
| dependencies=metadata.get('dependencies',{}) | |
| if set(dependencies)!=ALLOWED[name]:raise ValueError('Input preprocessing dependencies mismatch') | |
| for filename,expected in dependencies.items(): | |
| if hashlib.sha256((ROOT/filename).read_bytes()).hexdigest()!=expected:raise ValueError('Input preprocessing dependency source mismatch') | |
| module=importlib.import_module(name) | |
| if Path(module.__file__).resolve()!=file or module.VERSION!=metadata.get('version'):raise ValueError('Input preprocessing module identity mismatch') | |
| return module.normalize_state | |