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#!/usr/bin/perl
use HTTP::OAI;
use Getopt::Long;
use Pod::Usage;
use XML::LibXML;
=head1 NAME
oai_pmh.pl - pipe OAI-PMH to the command-line
=head1 SYNOPSIS
oai_pmh.pl <options> [baseURL]
=head1 OPTIONS
=over 8
=item --help
=item --man
=item --verbose
Be more verbose (repeatable).
=item --force
Force a non-conformant OAI request.
=item --from <ISO datetime>
=item --identifier <identifier>
OAI identifier to GetRecord or ListMetadataFormats.
=item --metadataPrefix <mdp>
Specify format of metadata to retrieve.
=item -X/--request <command>
Verb to request, defaults to ListRecords.
=item --set <oai set>
Request only those records in a set.
=item --until <ISO datetime>
=back
=head1 DESCRIPTION
Retrieve data from OAI-PMH endpoints. The output format is:
<headers>
<content>
<FORMFEED>
Where <headers> are in HTTP header format. Content will be the raw XML as exposed by the repository. Each record is separated by a FORMFEED character.
For example:
oai_pmh.pl -X GetRecord --metadataPrefix oai_dc \
--identifier oai:eprints.soton.ac.uk:20 http://eprints.soton.ac.uk/cgi/oai2
=cut
my %opts = (
verbose => 1,
);
GetOptions(\%opts,
'help',
'man',
'metadataPrefix=s',
'request|X=s',
'identifier=s',
'set=s',
'verbose+',
'force',
'from=s',
'until=s',
) or pod2usage(2);
pod2usage(1) if $opts{help};
pod2usage({-verbose => 2}) if $opts{man};
my $noise = delete $opts{verbose};
if (!exists $opts{request}) {
$opts{request} = 'ListRecords';
$opts{metadataPrefix} = 'oai_dc';
}
my $base_url = pop @ARGV;
pod2usage(1) if !$base_url;
my $ha = HTTP::OAI::Harvester->new(baseURL => $base_url);
my $f = delete $opts{request};
debug("Requesting $f", 2);
my $r = $ha->$f(
%opts,
onRecord => \&output_record,
);
if( $f eq "ListMetadataFormats" )
{
foreach my $mdf ($r->metadataFormat) {
print "metadataPrefix: " . $mdf->metadataPrefix . "\n";
print "schema: " . $mdf->schema . "\n";
print "metadataNamespace: " . $mdf->metadataNamespace . "\n";
print "\n";
print "\f";
}
}
if( !$r->is_success )
{
die "Error in response: " . $r->message . "\n";
}
sub debug
{
my( $msg, $level ) = @_;
warn "$msg\n" if $noise >= $level;
}
sub output_record
{
my( $rec ) = @_;
my $header = $rec->isa( 'HTTP::OAI::Header' ) ? $rec : $rec->header;
print "identifier: " . $header->identifier . "\n";
print "datestamp: " . $header->datestamp . "\n";
print "status: " . $header->status . "\n";
foreach my $set ($header->setSpec) {
print "setSpec: " . $set . "\n";
}
print "\n";
if ($rec->can( "metadata" ) && defined(my $metadata = $rec->metadata)) {
print $metadata->dom->toString( 1 );
}
print "\f";
}
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