Consider this situation:
import gzip
from django.http import FileResponse
def some_request(request):
return FileResponse(
gzip.open('/path/to/filename.gz'),
content_type="text/plain",
filename="filename.txt",
as_attachment=True
)
This theoretically should work fine, because why shouldn't it?
However the code that determines the Content-Length is as such (
https://github.com/django/django/blob/c1c68d1ac0f0d50eb37df32892b132f31a1179da/django/http/response.py#L425
):
if os.path.isabs(filename):
self['Content-Length'] = os.path.getsize(filelike.name)
elif hasattr(filelike, 'getbuffer'):
self['Content-Length'] = filelike.getbuffer().nbytes
Which gets the file size of the *compressed* gzip file. (the elif branch is
never run) That means that the Content-Length will be shorter than the
*uncompressed* content that I am actually sending.
My current "dumb" solution is as such:
from io import BytesIO
import shutil
def some_request(request):
buff = BytesIO()
with gzip.open('/path/to/filename.gz') as g:
shutil.copyfileobj(g, buff)
buff.seek(0)
return FileResponse(
buff,
content_type="text/plain",
filename="filename.txt",
as_attachment=True
)
This reads all the uncompressed content into a separate file-like object
that does not have the original file name information. Which forces
FileResponse to run the elif branch. Is there a better way to do things?
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