#!/usr/bin/perl -w

# $Id: resolve,v 1.9 2008-04-11 12:03:31 mike Exp $
#
# This is the front end for Keystone Resolver when invoked either as
# an OpenURL 0.1 resolver, or as a Z39.88 (OpenURL 1.0) resolver using
# any of the transports
#	info:ofi/tsp:http:openurl-by-val
#	info:ofi/tsp:http:openurl-by-ref
#	info:ofi/tsp:http:openurl-inline
# or their secure HTTPS equivalents, as defined in Part 1, section
# 15.1 of the standard, and as described in Part 2, section 9.  It
# works using both HTTP GET and HTTP POST.
#
# The classes that do the actual work are designed to work with other
# Z39.88 transports too, but none have been defined yet.

use strict;
use warnings;
use CGI;
use Keystone::Resolver;

Keystone::Resolver::Utils::apache_non_moronic_logging();

{
my $cgi = new CGI();
if (0) {
    ### Temporary measure.  We will want better logging down the line.
    my $file = "/usr/local/src/cvs/resolver/samples/openurls/samples";
    open F, ">>$file"
	or die "can't write to OpenURL log file '$file': $!";

    print F $cgi->query_string(), "\n";
    close F;
}

binmode STDERR, ":utf8"; # For any temporary debugging output
my $referer = $ENV{HTTP_REFERER} || "http://made.up.referrer/foo";
my $resolver = new Keystone::Resolver();
my $openURL = Keystone::Resolver::OpenURL->newFromCGI($resolver, $cgi, $referer);

my($type, $content);
eval {
    ($type, $content) = $openURL->resolve();
}; if ($@ && !ref $@ && $@ =~ /DBI connect.*failed/) {
    print <<__EOT__;
It was not possible to connect to the Keystone Resolver database.
Please see /usr/share/libkeystone-resolver-perl/db/README

Detailed error message follows, but you can probably ignore it:
--
$@
__EOT__
} elsif ($@ && (!ref $@ || $@->isa("HTML::Mason::Exception")) && $@ =~ /Unknown column/) {
    print <<__EOT__;
A column was missing from a table in the Keystone Resolver database.
This probably means that the structure of your database is out of date
Please see /usr/share/libkeystone-resolver-perl/db/README.update

Detailed error message follows, but you can probably ignore it:
--
$@
__EOT__
    return;
} elsif ($@) {
    print "Uh-oh!\n$@";
    exit;
}

my $r = Keystone::Resolver::Utils::apache_request($cgi);
$r->content_type($type);
print $content;
}