# Blosxom Plugin: ASIN
# Author: Nelson Minar <nelson@monkey.org>
# Version: 20030301
# http://www.nelson.monkey.org/~nelson/weblog/
# License: Public Domain

# ASIN is a Blosxom plugin that simplifies linking into Amazon's catalog.
# A link in a story like this:
#   <a href="asin:B000003RGY">the album I'm listening to</a>
# Turn into a link like this:
#   <a
# href="http://www.amazon.com/exec/obidos/ASIN/B000003RGY/ref=nosim/nelsonminar">the album I'm listening to</a>
# This link format is not a guaranteed standard, in particular the ref=nosim
# part. For the authority see
#   https://associates.amazon.com/exec/panama/associates/resources/build-links/individual-item-link.html

# Installation:
#   Modify the $associateID (or don't :-)
#   Drop asin into your plugins directory

# Todo:
#   Generalize this to any pseudoURI, not just asin:

package asin;

$associateID = 'nelsonminar';

sub start {
    1;
}

sub rewriteASIN {
    my ($url) = @_;
    $url =~ s%"asin:(.+)"%"\"http://www.amazon.com/exec/obidos/ASIN/$1/ref=nosim/$associateID\""%ies;
    return $url;    
}

# Modify the body of stories by rewriting asin: URIs to real URLs
sub story {
    my($pkg, $path, $filename, $story_ref, $title_ref, $body_ref) = @_;
    # Rewrite any <a href="asin:..."> tag in the post body
    $$body_ref =~ s/(<a\s[^>]*href="asin:[^>]+>)/rewriteASIN($1)/geis;
    1;
}

1;