bizou/plugins/tar/tar.php

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<?php
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/*
Bizou - a (french) KISS php image gallery
Copyright (C) 2010 Marc MAURICE
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 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
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
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# do not enable recursive tars by default
$TAR_FLAGS = "--no-recursion";
# send content length for browsers to display the progress bar
# note : won't work if the http server uses Chunked transfer encoding (http://en.wikipedia.org/wiki/Chunked_transfer_encoding)
# probably the case with gzip content-encoding.
# For this we need to tar files to /dev/null before the real tar
$SEND_CONTENT_LENGTH = true;
########################
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$bizouRootFromHere = '../..';
require "$bizouRootFromHere/config.php";
if (isset($_SERVER["PATH_INFO"])) {
$simplePath = $_SERVER["PATH_INFO"];
} else {
$simplePath = '/';
}
if (strpos($simplePath, '..') !== false) die(".. found in url");
$realDir = "$bizouRootFromHere/".IMAGES_DIR.$simplePath;
if ( ! is_dir($realDir) ) {
header("HTTP/1.1 404 Not Found");
die("Directory Not Found");
}
# change to the parent directory
chdir(dirname($realDir));
$filesarg = escapeshellarg(basename($realDir))."/*";
# compute and send content-length header
if ($SEND_CONTENT_LENGTH) {
$out = exec("tar $TAR_FLAGS --totals -cf /dev/null $filesarg 2>&1");
preg_match('/^Total bytes written: ([0-9]+) /', $out, $matches);
$totalsize = $matches[1];
header("Content-Length: $totalsize");
}
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# final step : stream the directory content via tar
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header('Content-Type: application/x-tar');
header('Content-Disposition: attachment; filename="'.basename($realDir).'.tar"');
passthru("tar $TAR_FLAGS -c $filesarg");
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?>