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Re: A session-aware kind of FileLibrary - how/where to start

Posted by jtuchel on Mar 30, 2021; 10:11am
URL: https://forum.world.st/A-session-aware-kind-of-FileLibrary-how-where-to-start-tp5128139p5128141.html

Hi Sven,

I started with a WAFileLibrary subclass first. I couldn't get it to work the way I wanted.

One of the problems is that all FileLibraries added by addLibrary: end up as an endpoint in the /files path, unless I also register a WAFileHandler (subclass) at another endpoint. In my case, I'd like to separate things: /files is for "public" files, and then there should be /attachments for "private" stuff of my users. AFAIK there is no way to register an additional File Library in another path/endpoint then /files, or is there? (this really is a question, not an argument...). Why do I want that? Because I want to keep the configuration of the frontend web server (Apache in my case) simple. Redirecting all requests of /files and subdirectories to some folder is easy. Not sure whether redirecting all but one is just as easy...?

The other one is that a WAFileLibrary subclass doesn't know its session either. As an experimented I added this override to one of my FileLibraries:

    

    

      
handle: aRequestContext
   self session ifNotNil: [:s| s halt].
   super handle: aRequestContext

    

    


    

    
And it never halts. This makes some
      sense, because in order to save files, you don't need a session.
      Anybody can have these files. And that is what I don't want for
      some files...

    

    


    

    
So I started subclassing WAFileHandler
      and found out a FileHandler doesn't know the session either . But
      I want to have access to the logged-ob user in the session. So it
      seems I either have to subclass from something else or add
      "something" to my WAFileHandler in the Application configuration,
      like a Filter or whetever...

    


    

    
So either I need to know something more
      about FileLibraries (register at something else than /files, make
      them session aware) or FileLibrary is not what I  have to
      subclass...

    


    

    
Any more ideas?

    


    

    
Joachim

    

    


    

    


    

    


    

    


    

    


    

    


    

    
Am 30.03.21 um 11:51 schrieb Sven Van
      Caekenberghe:

    

    

      
Hi Joachim,

I would try to look at WAFileHandler, which is responsible for serving the files.

It seems to delegate most work to WAFileLibrary>>#handle:

Maybe you can subclass WAFileLibrary (insert your superclass before your concrete class) to check the session for a login.

Sven



      

        
On 30 Mar 2021, at 11:18, [hidden email] wrote:

Hi,


There are situations in which I feel like after 10+ years of using Seaside, I am still a newbie. (well, same for Smalltalk after 25+ years, so this may be normal).

I would like to implement some kind of FileLibrary that is aware of the current session and only delivers files to logged-on users.

It seems like the best starting point for this is to subclass WARequestHandler and register it with WAAdmin. So the first thing I did was implement handleFiltered: aRequestContext. Unfortunately, neither aRequestContext nor self return a WASession, although I entered _s and _k form a logged in session into the address bar of my Browser. This may be a naive approach, but as a fist test case this seemed like a good idea ;-)

Now the question I ask myself is: how do I teach my WARequestHandler subclass the trick of knowing/finding the current session. Do I add some Filter? Is subclassing WARequestHandler the wrong idea anyways? (I started my experiments with a subclass of WAFileLibrary, but that also didn't get me anywhere...).

I am not asking for a ready-made solution. I'd rather try to understand a little more about Seasides innards here...

Any pointers? Kick-off ideas what to look at?


tia,


Joachim




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