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"""Procedures that operate on files/ directories"""
import hashlib
import json
import os
import random
import string
import tarfile
from functools import partial
from typing import Dict
from typing import List
from werkzeug.utils import secure_filename
def get_hash_of_files(files: List[str]) -> str:
"""Given a list of valid of FILES, return their hash as a string"""
md5hash = hashlib.md5()
for file_path in sorted(files):
if not os.path.exists(file_path):
raise FileNotFoundError
with open(file_path, "rb") as file_:
for buf in iter(partial(file_.read, 4096), b''):
md5hash.update(bytearray(hashlib.md5(buf).hexdigest(),
"utf-8"))
return md5hash.hexdigest()
def get_dir_hash(directory: str) -> str:
"""Return the hash of a DIRECTORY"""
if not os.path.exists(directory):
raise FileNotFoundError
all_files = [os.path.join(root, names)
for root, _, files in os.walk(directory)
for names in sorted(files)]
return get_hash_of_files(all_files)
def jsonfile_to_dict(json_file: str) -> Dict:
"""Give a JSON_FILE, return a python dict"""
with open(json_file) as _file:
data = json.load(_file)
return data
raise FileNotFoundError
def generate_random_n_string(n_length: int) -> str:
"""Generate a random string that is N chars long"""
return ''.join(random.choice(string.ascii_uppercase + string.digits)
for _ in range(n_length))
def extract_uploaded_file(gzipped_file, target_dir: str, token="") -> Dict:
"""Get the (directory) hash of extracted contents of GZIPPED_FILE; and move
contents to TARGET_DIR/<dir-hash>.
"""
if not token:
token = (f"{generate_random_n_string(6)}-"
f"{generate_random_n_string(6)}")
tar_target_loc = os.path.join(
target_dir,
token,
secure_filename(gzipped_file.filename))
try:
if not os.path.exists(os.path.join(target_dir, token)):
os.mkdir(os.path.join(target_dir, token))
gzipped_file.save(tar_target_loc)
# Extract to "tar_target_loc/token"
tar = tarfile.open(tar_target_loc)
tar.extractall(path=tar_target_loc)
tar.close()
# pylint: disable=W0703
except Exception:
return {"status": 128, "error": "gzip failed to unpack file"}
return {"status": 0, "token": token}
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