[ic] d/l link creation for soft goods with MV/Interchange 4.04

[Mark Stosberg <mark@summersault.com>]

Mike Heins wrote:
> There is a ready-to-go implementation [of soft goods] in the "simple" demo:
> 
>         ftp://ftp.minivend.com/pub/demos/

Thanks Mike,

   I grabbed that and I have been using it as model. At the moment I'm
concentrating on the example code on etc/receipt.html. I see the place
on the page where the "get_download" subroutine is created, but it
doesn't ever appear to be called! The page query/order_details.html has
a similiar structure, and it adds a call to get_download for each item
in the order, as given here. 

[calc]
	return unless
	q{[userdb function=check_file_acl mode=expire location="[sql-param sku]"]};
	return get_download(q{[sql-param sku]});
[/calc]

I tried merging this syntax with what was already on etc/receipt.html to
come up with the below code. 

My questions are: 

1. On etc/receipt.html in the simple demo, how are the download links
created? 
2. How can I get mine to show up? :) I followed the simple model
closely, and nothing is displaying on the page, and nothing is reported
in the error logs. Perhaps a more useful question is: When something
like this happens, what I can do to verify that parts of my code are
actually working? The standard Perl tricks I know don't seem to work here...

  Thanks much, 

	-mark

personal website             }      Summersault Website Development
http://mark.stosberg.com/    {      http://www.summersault.com/

### CODE STARTS HERE 

	[comment] Handle downloadables [/comment]
	[set download_present][/set]
	[item-list]
		[if-item-field download]
				[set download_present]1[/set]
				[userdb
						function=set_file_acl
						mode="expire 7 days"
						location="[item-code]"
				]
		[/if-item-field]
	[/item-list]
	[perl products]
		sub get_download {
			if (! $Scratch->{download_present}) {
				return '(<B>Must pay by credit card to download now.)</B>';
			}
			my $sku = shift;
			return '' unless tag_data('products', 'download', $sku);
			my $loc =  tag_data('products', 'dl_location', $sku);
			my $save = delete $Scratch->{mv_add_dot_html};
			my $url = $Tag->area( { href => "deliver/$loc", arg => $sku } ); 
			$Scratch->{mv_add_dot_html} = $save if $save;
			return qq{<BR><A HREF="$url">download</A>};
		}
		return;
	[/perl]	


	[item-list]
		[item-quantity]
		[item-code]
	    [item-field title]
	      	[calc]
				return unless q{[userdb function=check_file_acl mode=expire
location="[item-field sku]"]};
				return get_download(q{[item-field sku]});
			[/calc]	
		[item-price]
		[item-subtotal]
	[/item-list]

#################################

I also added the appropriate columns to products.txt, with the columns:

download	dl_type	dl_location

and the values:

1	application/pdf	test.pdf

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