[Zope] one time downloads

Thu, 19 Jun 2003 15:33:59 -0400

On Wed, 18 Jun 2003 10:51:38 -0700 (PDT)
Ed Colmar <ed@greengraphics.net> wrote:

> 
> Hey fellow zope fiends.
> 
> I've got a little project I'm working on that involves setting up
> multiple one-time downloads.
> 
> I'm curious if anyone out there has done something similar that would
> like to share ideas and or code.
> 
> My concept was to have all the files in a secure directory somewhere.
> Make a temporary directory somewhere with a random id
> "oahnw3487cfyawcry7baw385vbyawy348vyaw" or whatever...  Set the
> directory name and a flag into a db somewhere.  Then after the
> download is complete(or after a certain amount of time, delete the dir
> and the files.

Yes, it is not real hard.  You will probably need an external method. 
Here is what I do, more or less:

import sha, os
my_secret='Put your site secret string here'
f_base='absolute path to file base'
def upload(self, name, attachment):
  # make sure index.html is there
  # to block people from simply reading the directory
  if not os.access(f_base+'/index.html', os.F_OK):
    f.open('index.html', w)
    f.write("""<html><head><title>No Peaking</title></head>
      <body>No Peaking!</body></html>"""
    f.close()
  so=sha.new(my_secret+name)
  hx=so.hexdigest()
  fpth=f_base+name+hx+'.html'    # or whatever extension
  f=open(fpth, 'wb')
  while 1:
    s=attachment.read(4096)
    if not s:
      break
    once = 1
    f.write(s)
  f.close()
  return fpth

Then you can use fpth to compose your email, athough you probably
actually want to construct an URL, not a file path.

And a simple cron job can take care of cleaning the directory for you
periodically.  Just try to avoid deleting index.html.

Jim Penny

> Anyone have something like this already?
> 
> Thanks!
> 
> -ed-
> 
> -- 
> Green Graphics   :::   Print and Web Design   :::   510.923.0000
> 
> 
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