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"""Procedures that operate on files/ directories"""
import hashlib
import json
import os
import shutil
import random
import string
import tarfile
from functools import partial
from typing import Dict
from werkzeug.utils import secure_filename
from gn3.settings import APP_DEFAULTS
def get_dir_hash(directory: str) -> str:
"""Return the hash of a DIRECTORY"""
md5hash = hashlib.md5()
if not os.path.exists(directory):
raise FileNotFoundError
for root, _, files in os.walk(directory):
for names in sorted(files):
file_path = os.path.join(root, names)
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 lookup_file(environ_var: str,
root_dir: str,
file_name: str) -> str:
"""Look up FILE_NAME in the path defined by ENVIRON_VAR/ROOT_DIR/; If
ENVIRON_VAR/ROOT_DIR/FILE_NAME does not exist, raise an exception.
Otherwise return ENVIRON_VAR/ROOT_DIR/FILE_NAME.
"""
_dir = APP_DEFAULTS.get(environ_var,
os.environ.get(environ_var))
if _dir:
_file = os.path.join(_dir, root_dir, file_name)
if os.path.isfile(_file):
return _file
raise FileNotFoundError
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) -> Dict:
"""Get the (directory) hash of extracted contents of GZIPPED_FILE; and move
contents to TARGET_DIR/<dir-hash>.
"""
tar_target_loc = os.path.join(target_dir,
secure_filename(gzipped_file.filename))
gzipped_file.save(tar_target_loc)
try:
# Extract to "tar_target_loc/tempdir"
tar = tarfile.open(tar_target_loc)
tar.extractall(
path=os.path.join(target_dir, "tempdir"))
tar.close()
# pylint: disable=W0703
except Exception:
return {"status": 128, "error": "gzip failed to unpack file"}
dir_hash = get_dir_hash(tar_target_loc)
if os.path.exists(os.path.join(target_dir, dir_hash)):
shutil.rmtree(os.path.join(target_dir, 'tempdir'))
else:
os.rename(os.path.join(target_dir, "tempdir"),
os.path.join(target_dir, dir_hash))
return {"status": 0, "token": dir_hash}
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