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#!/usr/local/cpanel/3rdparty/bin/perl

# cpanel - scripts/custom_backup_destination.pl.sample
#                                                  Copyright 2022 cPanel, L.L.C.
#                                                           All rights reserved.
# copyright@cpanel.net                                         http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited

use strict;
use warnings;
use Cwd qw(getcwd abs_path);
use File::Spec;
use File::Copy;
use File::Path qw(make_path remove_tree);
use autodie    qw(:all copy);

# These are the commands that a custom destination script must process
my %commands = (
    put    => \&my_put,
    get    => \&my_get,
    ls     => \&my_ls,
    mkdir  => \&my_mkdir,
    chdir  => \&my_chdir,
    rmdir  => \&my_rmdir,
    delete => \&my_delete,
);

# There must be at least the command and the local directory
usage() if ( @ARGV < 2 );

#
# The command line arguments passed to the script will be in the following order:
# command, local_directory, command arguments, and optionally, host and user
# The local directory is passed in so we know from which directory to run the command
# we need to pass this in each time since we start the script fresh for each command
#
my ( $cmd, $local_dir, @args ) = @ARGV;

# complain if the command does not exist
usage() unless exists $commands{$cmd};

# For this example transport, we are going to simply copy everything under this directory
my $dest_root_dir = '/custom_transport_demo';
mkdir $dest_root_dir unless -d $dest_root_dir;

# Step into the local directory
# This will be under the directory that we have as the file destination
$local_dir = File::Spec->catdir( $dest_root_dir, $local_dir );
make_path($local_dir) unless -d $local_dir;
chdir $local_dir;

# Run our command
$commands{$cmd}->(@args);

#
# This script should only really be executed by the custom backup destination type
# If someone executes it directly out of curiosity, give them usage info
#
sub usage {
    my @cmds = sort keys %commands;
    print STDERR "This script is for implementing a custom backup destination\n";
    print STDERR "It requires the following arguments:  cmd, local_dir, cmd_args\n";
    print STDERR "These are the valid commands:  @cmds\n";
    exit 1;
}

#
# Convert a path to be under our destination directory
# Absolute paths will be directly under it,
# relative paths will be relative to the local directory
#
sub convert_path {
    my ($path) = @_;

    if ( $path =~ m|^/| ) {
        $path = File::Spec->catdir( $dest_root_dir, $path );
    }
    else {
        $path = File::Spec->catdir( $local_dir, $path );
    }

    return $path;
}

#
# Convert a full path to the path under the the directory
# where we copy all the files
#
sub get_sub_directory {
    my ($path) = @_;

    # The first part will be the destination root directory,
    # Remove that part of the path and we will have the subdirectory
    $path =~ s|^$dest_root_dir||;

    return $path;
}

#
# This portion contains the implementations for the various commands
# that the script needs to support in order to implement a custom destination
#

#
# Copy a local file to a remote destination
#
sub my_put {
    my ( $local, $remote ) = @_;

    $remote = convert_path($remote);

    # Make sure the full destination directory exists
    my ( undef, $dir, undef ) = File::Spec->splitpath($remote);
    make_path($dir) unless ( $dir and -d $dir );
    copy( $local, $remote );
    return;
}

#
# Copy a remote file to a local destination
#
sub my_get {
    my ( $remote, $local ) = @_;

    $remote = convert_path($remote);

    copy( $remote, $local );
    return;
}

#
# Print out the results of doing an ls operation
# The calling program will expect the data to be
# in the format supplied by 'ls -l' and have it
# printed to STDOUT
#
sub my_ls {
    my ($path) = @_;

    $path = convert_path($path);

    # Cheesy, but this is a demo
    my $ls = `ls -al $path`;

    # Remove the annoying 'total' line
    $ls =~ s|^total[^\n]*\n||;

    print $ls;
    return;
}

#
# Create a directory on the remote destination
#
sub my_mkdir {
    my ($path) = @_;

    $path = convert_path($path);

    make_path($path);

    die "Failed to create $path" unless -d $path;
    return;
}

#
# Change into a directory on the remote destination
# This does not have the same meaning as it normally would since the script
# is run anew for each command call.
# This needs to do the operation to ensure it doesn't fail
# then print the new resulting directory that the calling program
# will pass in as the local directory for subsequent calls
#
sub my_chdir {
    my ($path) = @_;

    $path = convert_path($path);
    chdir $path;

    print get_sub_directory( getcwd() ) . "\n";
    return;
}

#
# Recursively delete a directory on the remote destination
#
sub my_rmdir {
    my ($path) = @_;

    $path = convert_path($path);

    remove_tree($path);

    die "$path still exists" if -d $path;
    return;
}

#
# Delete an individual file on the remote destination
#
sub my_delete {
    my ($path) = @_;

    $path = convert_path($path);

    unlink $path;
    return;
}