Played trivial pursuit with the kids today, it came up, I got the answer!

On Sat, Feb 18, 2012 at 8:05 PM, C. Mundi <[email protected]> wrote:

> @deitcher: yeah. That's where I'm headed now.  I really messed myself up
> looking for something complicated when all I needed was to send a file.
> BTW...Dylan is always a good example.  :)
> On Feb 18, 2012 10:04 AM, "deitch" <[email protected]> wrote:
>
>> Yeah, I would do that. However, I would not store the files that way,
>> because what if one file (dylan.mp3) is accessible to three users? So
>> I would do
>>
>> Files: /some/private/dir/music/files/dylan.mp3 (or some other naming
>> convention)
>> Path: /downloads/:user/:musicfile
>>
>> You *cannot* get to /some/private/dir/music/files/ directly by URL,
>> only to /downloads/:user/:musicfile, which first checks that the user
>> is authenticated to /downloads/:user, then checks if :musicfile is
>> allowed for user, and if it is, then fetches the file from its true
>> path.
>>
>> On Feb 18, 3:57 am, Edward Smith <[email protected]> wrote:
>> > I would put them in a directory not accessible by clients, and have node
>> > route urls with specific hashes, for each file for each user.  The route
>> > could be something like /$user/download/$hash (anything with a $ in
>> front
>> > of it will vary based off of user).  The combination of $user and $hash
>> > should be stored in a database so you can find out if it is valid and
>> what
>> > file it should be.  Then send the file.
>> >
>> > I have never implemented something like this, but this is how I would
>> > probably do it.
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > On Fri, Feb 17, 2012 at 5:45 PM, C. Mundi <[email protected]> wrote:
>> > > This is obviously a solved problem.  I don't want to reinvent the
>> wheel.
>> >
>> > > Imagine a digital music store.  I have a set of static files which I
>> need
>> > > to serve only to authenticated users.  So the set of accessible files
>> > > depends on the user.  How do I let each user get the files she is
>> entitled
>> > > to and no other files?
>> >
>> > > Bad Idea 1: security by obscurity: hide the files behind query strings
>> > > generated on the fly for session.user in the form of nasty looking
>> hard to
>> > > guess hashes.  Ugly hack and vulnerable to brute force hash collision.
>> > > Yuck!
>> >
>> > > Bad Idea 2: set up an instance of node-static.Server() for each
>> > > authenticated session, specifically serving a directory created on
>> the fly
>> > > for that session and containing symlinks to all (and only) files for
>> which
>> > > session.user has privileges.  The main server would redirect requests
>> for
>> > > files to the ad hoc static server.  Kludgus maximus!
>> >
>> > > Good Idea: what you tell me.  :)
>> >
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