I'm writing a small app with pyramid. One view serves files with a FileResponse. What I want to do is limiting those files to certain domains.
If this site http://www.example.com/index.html includes a file like:
<img src="http://myapp.com/servethisfile" />
I want to know the domain of the site which requests a file from my app. (example.com)
The limitation has to be done within the view as if will change during runtime.
The browser sends the referrer in the HTTP headers when doing a request. It's easily hackable though and I would not rely on this to protect something important.
In Pyramid, you can access that header in request.referrer
.