utils.py

#
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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
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#
#   http://www.apache.org/licenses/LICENSE-2.0
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import os
import urllib.request
import tarfile
import glob
import onnx
import logging
logging.basicConfig(level=logging.INFO, format='%(asctime)-15s %(message)s')


def download_model(url):
    download_dir = '/tmp/'
    with tarfile.open(check_exist_or_download(url), 'r') as t:
        def is_within_directory(directory, target):
            
            abs_directory = os.path.abspath(directory)
            abs_target = os.path.abspath(target)
        
            prefix = os.path.commonprefix([abs_directory, abs_target])
            
            return prefix == abs_directory
        
        def safe_extract(tar, path=".", members=None, *, numeric_owner=False):
        
            for member in tar.getmembers():
                member_path = os.path.join(path, member.name)
                if not is_within_directory(path, member_path):
                    raise Exception("Attempted Path Traversal in Tar File")
        
            tar.extractall(path, members, numeric_owner=numeric_owner) 
            
        
        safe_extract(t, path=download_dir)


def load_dataset(test_data_dir):
    # load inputs
    inputs = []
    inputs_num = len(glob.glob(os.path.join(test_data_dir, 'input_*.pb')))
    for i in range(inputs_num):
        input_file = os.path.join(test_data_dir, 'input_{}.pb'.format(i))
        onnx_tensor = onnx.TensorProto()
        with open(input_file, 'rb') as f:
            onnx_tensor.ParseFromString(f.read())
        inputs.append(onnx.numpy_helper.to_array(onnx_tensor))

    # load reference outputs
    ref_outputs = []
    ref_outputs_num = len(glob.glob(os.path.join(test_data_dir, 'output_*.pb')))
    for i in range(ref_outputs_num):
        output_file = os.path.join(test_data_dir, 'output_{}.pb'.format(i))
        onnx_tensor = onnx.TensorProto()
        with open(output_file, 'rb') as f:
            onnx_tensor.ParseFromString(f.read())
        ref_outputs.append(onnx.numpy_helper.to_array(onnx_tensor))
    return inputs, ref_outputs


def check_exist_or_download(url):
    download_dir = '/tmp/'
    name = url.rsplit('/', 1)[-1]
    filename = os.path.join(download_dir, name)
    if not os.path.isfile(filename):
        logging.info("Downloading %s" % url)
        urllib.request.urlretrieve(url, filename)
    return filename