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#!/usr/bin/env perl

# Copyright (C) 2009 by Mark Atwood <mark@fallenpegasus.com>.
# 
# This module is not an official Amazon product or service.  Information
# used to create this module was obtained only from publicly available
# information, mainly from the published Amazon documentation.
#
# This module is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 2.1 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# and the GNU Lesser General Public License along with this program.
# If not, see <http://www.gnu.org/licenses/>.

use warnings;
use strict;
use Getopt::Long;
use Pod::Usage;
use Net::Amazon::S3;
use Net::Amazon::S3::Bucket;
use Getopt::ArgvFile qw/argvFile/;
use File::HomeDir;

use vars qw/$OWNER_ID $OWNER_DISPLAYNAME/;

my $aws_access_key_id = $ENV{AWS_ACCESS_KEY_ID};
my $aws_secret_access_key = $ENV{AWS_ACCESS_KEY_SECRET};
my $opt_verbose =0;
my $opt_help =0;
my $opt_man =0;
my $opt_secure =0;

# get the options from the users ~/.s3-tools file, if it exists
my $users_config = File::HomeDir->my_home() . '/.s3-tools';
if (-e $users_config) {
    unshift @ARGV, '@' . $users_config;
}
argvFile();

GetOptions('help|?' => \$opt_help, 'man' => \$opt_man,
	   'verbose+' => \$opt_verbose,
	   'access-key=s' => \$aws_access_key_id,
	   'secret-key=s' => \$aws_secret_access_key,
	   'secure' => \$opt_secure
	   )
    or pod2usage(2);
pod2usage(1) if $opt_help;
pod2usage(-exitstatus => 0, -verbose => 2) if $opt_man;
 
my $s3p = { aws_access_key_id => $aws_access_key_id,
	    aws_secret_access_key => $aws_secret_access_key };
$s3p->{secure} = $opt_secure
    if ($opt_secure);
my $s3 = Net::Amazon::S3->new($s3p);
($s3) or die("$0: fail Net::Amazon::S3: $!, stopped");

my $bkts = make_bucketlist();
foreach my $b (@{$bkts}) {
    next unless $b->{itemkey};
    if ($b->{bucketobject}->delete_key($b->{itemkey})) {
	print STDERR "$0: deleted item " . $b->{bucketname} . "/" . $b->{itemkey} . "\n"
	    if $opt_verbose;
    } else {
	print STDERR "$0: cannot delete item " . $b->{bucketname} . "/" . $b->{itemkey} . " :"
	    . $s3->err . ": " . $s3->errstr . "\n";
    }
}

# TODO, refactor this out and put it in the module
sub make_bucketlist
{
    my @B;
    my ($bn, $ik, $b);
    foreach my $arg (@ARGV) {
	$b = undef;
	$b->{arg} = $arg;
	($bn, $ik) = split('/', $arg, 2);
	$b->{bucketname} = $bn;
	$b->{itemkey} = $ik
	    if ($ik);
	$b->{bucketobject} = $s3->bucket($bn);
	push @B, $b;
    }
    return \@B;
}


__END__

=head1 NAME

s3rm - Delete Amazon AWS S3 items

=head1 SYNOPSIS

s3rm [options] [bucket/item ...]

 Options:
   --access-key    AWS Access Key ID
   --secret-key    AWS Secret Access Key
 Environment:
   AWS_ACCESS_KEY_ID
   AWS_ACCESS_KEY_SECRET

=head1 OPTIONS

=over 8

=item B<--help>

Print a brief help message and exits.

=item B<--man>

Prints the manual page and exits.

=item B<--verbose>

Print a message for each created bucket.

=item B<--access-key> and B<--secret-key>

Specify the "AWS Access Key Identifiers" for the AWS account.
B<--access-key> is the "Access Key ID", and B<--secret-key> is
the "Secret Access Key".  These are effectively the "username" and
"password" to the AWS account, and should be kept confidential.

The access keys MUST be specified, either via these command line
parameters, or via the B<AWS_ACCESS_KEY_ID> and
B<AWS_ACCESS_KEY_SECRET> environment variables.

Specifying them on the command line overrides the environment
variables.

=item B<--secure>

Uses SSL/TLS HTTPS to communicate with the AWS service, instead of
HTTP.

=back

=head1 ENVIRONMENT VARIABLES

=over 8

=item B<AWS_ACCESS_KEY_ID> and B<AWS_ACCESS_KEY_SECRET>

Specify the "AWS Access Key Identifiers" for the AWS account.
B<AWS_ACCESS_KEY_ID> contains the "Access Key ID", and
B<AWS_ACCESS_KEY_SECRET> contains the "Secret Access Key".  These are
effectively the "username" and "password" to the AWS service, and
should be kept confidential.

The access keys MUST be specified, either via these environment
variables, or via the B<--access-key> and B<--secret-key> command line
parameters.

If the command line parameters are set, they override these
environment variables.

=back

=head1 CONFIGURATION FILE

The configuration options will be read from the file C<~/.s3-tools> if it
exists.  The format is the same as the command line options with one option
per line.  For example, the file could contain:

    --access-key <AWS access key>
    --secret-key <AWS secret key>
    --secure

This example configuration file would specify the AWS access keys and that a
secure connection using HTTPS should be used for all communications.

=head1 DESCRIPTION

Delete items in the Amazon Simple Storage Service (S3).

=head1 BUGS

Report bugs to Mark Atwood L<mark@fallenpegasus.com>.

Occasionally the S3 service will randomly fail for no externally
apparent reason.  When that happens, this tool should retry, with a
delay and a backoff.

Access to the S3 service can be authenticated with a X.509
certificate, instead of via the "AWS Access Key Identifiers".  This
tool should support that.

It might be useful to be able to specify the "AWS Access Key
Identifiers" in the user's C<~/.netrc> file.  This tool should support
that.

Some errors and warnings are very "Perl-ish", and can be confusing.

=head1 AUTHOR

Written by Mark Atwood L<mark@fallenpegasus.com>.

Many thanks to Wotan LLC L<http://wotanllc.com>, for supporting the
development of these S3 tools.

Many thanks to the Amazon AWS engineers for developing S3.

=head1 SEE ALSO

These tools use the L<Net::Amazon:S3> Perl module.

The Amazon Simple Storage Service (S3) is documented at
L<http://aws.amazon.com/s3>.

=cut