blob: d37a53ea1d71914790b59a84800ccb5e14d5d6f7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
"""Utilities to deal with uploaded files."""
import hashlib
from pathlib import Path
from typing import Iterator
from datetime import datetime
from flask import current_app
from werkzeug.utils import secure_filename
from werkzeug.datastructures import FileStorage
def save_file(fileobj: FileStorage, upload_dir: Path) -> Path:
"""Save the uploaded file and return the path."""
assert bool(fileobj), "Invalid file object!"
hashed_name = hashlib.sha512(
f"{fileobj.filename}::{datetime.now().isoformat()}".encode("utf8")
).hexdigest()
filename = Path(secure_filename(hashed_name)) # type: ignore[arg-type]
if not upload_dir.exists():
upload_dir.mkdir()
filepath = Path(upload_dir, filename)
fileobj.save(filepath)
return filepath
def fullpath(filename: str):
"""Get a file's full path. This makes use of `flask.current_app`."""
return Path(current_app.config["UPLOAD_FOLDER"], filename).absolute()
def chunked_binary_read(filepath: Path, chunksize: int = 2048) -> Iterator:
"""Read a file in binary mode in chunks."""
with open(filepath, "rb") as inputfile:
while True:
data = inputfile.read(chunksize)
if data != b"":
yield data
continue
break
def sha256_digest_over_file(filepath: Path) -> str:
"""Compute the sha256 digest over a file's contents."""
filehash = hashlib.sha256()
for chunk in chunked_binary_read(filepath):
filehash.update(chunk)
return filehash.hexdigest()
|
