| """Verify and extract an individual FlyControl figure archive.""" |
| import argparse, hashlib, json, tarfile |
| from pathlib import Path |
|
|
| def sha(path): |
| h=hashlib.sha256() |
| with Path(path).open('rb') as f: |
| for block in iter(lambda:f.read(8*1024*1024),b''):h.update(block) |
| return h.hexdigest() |
|
|
| def extract(figure, root, output): |
| root,output=Path(root).resolve(),Path(output).resolve() |
| index=json.loads((root/'archive_index.json').read_text())['archives'] |
| item=next(x for x in index if x['paper_item']==figure) |
| archive=root/item['path'] |
| assert archive.stat().st_size==item['bytes'] and sha(archive)==item['sha256'], 'Archive integrity failure' |
| manifest={x['path']:x for x in map(json.loads,(root/'manifests'/f'{figure}.jsonl').open())} |
| assert len(manifest)==item['members'] |
| output.mkdir(parents=True,exist_ok=True) |
| seen=set() |
| with tarfile.open(archive,'r|gz') as tar: |
| for member in tar: |
| if not member.isfile() or member.name not in manifest or member.name in seen: |
| raise ValueError('Unexpected archive member: '+member.name) |
| dest=(output/member.name).resolve() |
| if not dest.is_relative_to(output):raise ValueError('Unsafe member path') |
| expected=manifest[member.name] |
| assert member.size==expected['bytes'] |
| dest.parent.mkdir(parents=True,exist_ok=True) |
| if dest.exists(): |
| assert dest.stat().st_size==expected['bytes'] and sha(dest)==expected['sha256'], str(dest) |
| else: |
| stream=tar.extractfile(member) |
| hasher=hashlib.sha256() |
| try: |
| with dest.open('xb') as f: |
| for block in iter(lambda:stream.read(8*1024*1024),b''): |
| f.write(block);hasher.update(block) |
| assert hasher.hexdigest()==expected['sha256'], str(dest) |
| except BaseException: |
| dest.unlink(missing_ok=True) |
| raise |
| seen.add(member.name) |
| assert seen==set(manifest) |
| print(json.dumps(dict(figure=figure,members=len(seen),verified=True,output=str(output)))) |
|
|
| if __name__=='__main__': |
| p=argparse.ArgumentParser(description=__doc__) |
| p.add_argument('--figure',required=True) |
| p.add_argument('--dataset-dir',default=str(Path(__file__).parent)) |
| p.add_argument('--output',required=True) |
| a=p.parse_args();extract(a.figure,a.dataset_dir,a.output) |
|
|
