Viewing file:  Timestamps.php (5.49 KB) -rw-r--r--
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<?php
/*
* This file is part of PHAR Utils.
*
* (c) Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Seld\PharUtils;
class Timestamps
{
private $contents;
/**
* @param string $file path to the phar file to use
*/
public function __construct($file)
{
$this->contents = file_get_contents($file);
}
/**
* Updates each file's unix timestamps in the PHAR
*
* The PHAR signature can then be produced in a reproducible manner.
*
* @param int|DateTime|string $timestamp Date string or DateTime or unix timestamp to use
*/
public function updateTimestamps($timestamp = null)
{
if ($timestamp instanceof \DateTime) {
$timestamp = $timestamp->getTimestamp();
} elseif (is_string($timestamp)) {
$timestamp = strtotime($timestamp);
} elseif (!is_int($timestamp)) {
$timestamp = strtotime('1984-12-24T00:00:00Z');
}
// detect manifest offset / end of stub
if (!preg_match('{__HALT_COMPILER\(\);(?: +\?>)?\r?\n}', $this->contents, $match, PREG_OFFSET_CAPTURE)) {
throw new \RuntimeException('Could not detect the stub\'s end in the phar');
}
// set starting position and skip past manifest length
$pos = $match[0][1] + strlen($match[0][0]);
$stubEnd = $pos + $this->readUint($pos, 4);
$pos += 4;
$numFiles = $this->readUint($pos, 4);
$pos += 4;
// skip API version (YOLO)
$pos += 2;
// skip PHAR flags
$pos += 4;
$aliasLength = $this->readUint($pos, 4);
$pos += 4 + $aliasLength;
$metadataLength = $this->readUint($pos, 4);
$pos += 4 + $metadataLength;
while ($pos < $stubEnd) {
$filenameLength = $this->readUint($pos, 4);
$pos += 4 + $filenameLength;
// skip filesize
$pos += 4;
// update timestamp to a fixed value
$this->contents = substr_replace($this->contents, pack('L', $timestamp), $pos, 4);
// skip timestamp, compressed file size, crc32 checksum and file flags
$pos += 4*4;
$metadataLength = $this->readUint($pos, 4);
$pos += 4 + $metadataLength;
$numFiles--;
}
if ($numFiles !== 0) {
throw new \LogicException('All files were not processed, something must have gone wrong');
}
}
/**
* Saves the updated phar file, optionally with an updated signature.
*
* @param string $path
* @param int $signatureAlgo One of Phar::MD5, Phar::SHA1, Phar::SHA256 or Phar::SHA512
* @return bool
*/
public function save($path, $signatureAlgo)
{
$pos = $this->determineSignatureBegin();
$algos = array(
\Phar::MD5 => 'md5',
\Phar::SHA1 => 'sha1',
\Phar::SHA256 => 'sha256',
\Phar::SHA512 => 'sha512',
);
if (!isset($algos[$signatureAlgo])) {
throw new \UnexpectedValueException('Invalid hash algorithm given: '.$signatureAlgo.' expected one of Phar::MD5, Phar::SHA1, Phar::SHA256 or Phar::SHA512');
}
$algo = $algos[$signatureAlgo];
// re-sign phar
// signature
$signature = hash($algo, substr($this->contents, 0, $pos), true)
// sig type
. pack('L', $signatureAlgo)
// ohai Greg & Marcus
. 'GBMB';
$this->contents = substr($this->contents, 0, $pos) . $signature;
return file_put_contents($path, $this->contents);
}
private function readUint($pos, $bytes)
{
$res = unpack('V', substr($this->contents, $pos, $bytes));
return $res[1];
}
/**
* Determine the beginning of the signature.
*
* @return int
*/
private function determineSignatureBegin()
{
// detect signature position
if (!preg_match('{__HALT_COMPILER\(\);(?: +\?>)?\r?\n}', $this->contents, $match, PREG_OFFSET_CAPTURE)) {
throw new \RuntimeException('Could not detect the stub\'s end in the phar');
}
// set starting position and skip past manifest length
$pos = $match[0][1] + strlen($match[0][0]);
$manifestEnd = $pos + 4 + $this->readUint($pos, 4);
$pos += 4;
$numFiles = $this->readUint($pos, 4);
$pos += 4;
// skip API version (YOLO)
$pos += 2;
// skip PHAR flags
$pos += 4;
$aliasLength = $this->readUint($pos, 4);
$pos += 4 + $aliasLength;
$metadataLength = $this->readUint($pos, 4);
$pos += 4 + $metadataLength;
$compressedSizes = 0;
while (($numFiles > 0) && ($pos < $manifestEnd - 24)) {
$filenameLength = $this->readUint($pos, 4);
$pos += 4 + $filenameLength;
// skip filesize and timestamp
$pos += 2*4;
$compressedSizes += $this->readUint($pos, 4);
// skip compressed file size, crc32 checksum and file flags
$pos += 3*4;
$metadataLength = $this->readUint($pos, 4);
$pos += 4 + $metadataLength;
$numFiles--;
}
if ($numFiles !== 0) {
throw new \LogicException('All files were not processed, something must have gone wrong');
}
return $manifestEnd + $compressedSizes;
}
}
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