Verify if the file uploaded in django is a zip file

I'm working on a POST method handler in Django that deals with uploaded files, and I want to ensure that the file is a valid zip file before continuing.

My current code snippet looks like this:

@login_required(login_url="login/")
def upload(request):
    if request.method == 'POST' and request.FILES['upload_file']:
        uploaded_file = request.FILES['upload_file']
        print type(uploaded_file)

    return render(request, 'upload.html', {'context': RequestContext(request)})

Right now, uploaded_file is shown as being of type

<class 'django.core.files.uploadedfile.InMemoryUploadedFile'>
. My question is, what would be the most effective way to confirm that this is indeed a valid archive? Do I have to save it to disk first and then utilize the zipfile module, or could there be a way to validate without writing to disk?

Note: I've opted not to use the Django model with a FileField and Form for reasons unrelated to this specific issue.

Answer №1

A recommended approach is to utilize the zipfile module.

To check if a file is a valid ZIP file, you can use the zipfile.is_zipfile(filename) method.

If the filename corresponds to a valid ZIP file based on its magic number, the function will return True; otherwise, it will return False. It's important to note that the filename parameter can also refer to a file or a file-like object. (Updated in version 3.1: Added support for file and file-like objects.)

Alternatively: (unlikely but still an option)

Refer to this resource for guidance on how to determine the type of compression used in a file when no file extension is specified: How to detect type of compression used on the file? (if no file extension is specified)

Detailed information about the header formats can be found in the descriptions:

Description of Zip (.zip) format, which typically begins with values like 0x50, 0x4b, 0x03, 0x04 (unless empty — in which case the last two could be 0x05, 0x06 or 0x06, 0x06)

Answer №2

Keep track of the name of the item

Item_name = request.FILES['filename'].name

Next, verify if it's a zip file

If Item_name.endswith('.zip'):
     print(True)

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