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"""Procedures that operate on files/ directories"""
import hashlib
import json
import os
import random
import string
import tarfile
import pathlib
from functools import partial
from typing import Dict
from typing import List
from werkzeug.utils import secure_filename
import ipfshttpclient
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, encoding="utf-8") 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: str = "") -> 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=os.path.join(target_dir, token))
tar.close()
# pylint: disable=W0703
except Exception:
return {"status": 128, "error": "gzip failed to unpack file"}
return {"status": 0, "token": token}
def cache_ipfs_file(ipfs_file: str,
cache_dir: str,
ipfs_addr: str = "/ip4/127.0.0.1/tcp/5001") -> str:
"""Check if a file exists in cache; if it doesn't, cache it. Return the
cached file location
"""
file_loc = os.path.join(cache_dir, ipfs_file.split("ipfs/")[-1])
if not os.path.exists(file_loc):
client = ipfshttpclient.connect(ipfs_addr)
client.get(ipfs_file,
target=str(
pathlib.Path
(os.path.join(cache_dir,
ipfs_file.split("ipfs/")[-1])).parent))
return file_loc
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