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"""Utilities to deal with uploaded files."""
import hashlib
from pathlib import Path
from datetime import datetime
from flask import current_app
from werkzeug.utils import secure_filename
from werkzeug.datastructures import FileStorage
from .chunks import chunked_binary_read
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 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()
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