D in accounting program

[Adam D. Ruppe]

Mengu asked:
> how did you handle file uploads and user sessions?

File uploads are passed through CGI applications through
stdin. My Cgi class (http://arsdnet.net/dcode/cgi.d) supports
it through an associative array interface:
====
        struct UploadedFile {
                string name;
                string filename;
                string contentType;
                immutable(ubyte)[] content;
        }

        immutable(UploadedFile)[string] files;
=====

So if you have a file upload form, the file sits there in memory.
The maximum size of file is set in the constructor (defaults
to ~5 MB to avoid using too much memory).

A better way might be to replace the AA with a range that
lazily reads stdin, but I wanted to keep it simple.

To save it in code, you just:

std.file.write("myfile.png", cgi.files["name-from-form"].content);



User sessions are just done through the mysql database, with
a key that comes from a cookie and the user agent and ip address.
I didn't bother with anything like PHP's $_SESSION - the
active_sessions database table works better anyway.