public static function patchFile($item, $info, $algorithm, $patch)
{
switch ($algorithm) {
case 'bsdiff':
case 'xdelta':
case 'vcdiff':
break;
case 'xdiff':
if (!function_exists('xdiff_file_patch_binary')) {
throw new Exception("=xdiff not available");
}
break;
default:
throw new Exception("Invalid algorithm '{$algorithm}'", Z_ERROR_INVALID_INPUT);
}
$originalInfo = Zotero_S3::getLocalFileItemInfo($item);
$basePath = "/tmp/zfsupload/";
$path = $basePath . $info->hash . "_" . uniqid() . "/";
mkdir($path, 0777, true);
$cleanup = function () use($basePath, $path) {
unlink("original");
unlink("patch");
unlink("new");
chdir($basePath);
rmdir($path);
};
$e = null;
try {
// Download file from S3 to temp directory
if (!Zotero_S3::downloadFile($originalInfo, $path, "original")) {
throw new Exception("Error downloading original file");
}
chdir($path);
// Save body to temp file
file_put_contents("patch", $patch);
// Patch file
switch ($algorithm) {
case 'bsdiff':
exec('bspatch original new patch 2>&1', $output, $ret);
if ($ret) {
throw new Exception("Error applying patch ({$ret}): " . implode("\n", $output));
}
if (!file_exists("new")) {
throw new Exception("Error applying patch ({$ret})");
}
break;
case 'xdelta':
case 'vcdiff':
exec('xdelta3 -d -s original patch new 2>&1', $output, $ret);
if ($ret) {
if ($ret == 2) {
Z_HTTP::e400("Invalid delta");
}
throw new Exception("Error applying patch ({$ret}): " . implode("\n", $output));
}
if (!file_exists("new")) {
throw new Exception("Error applying patch ({$ret})");
}
break;
case 'xdiff':
$ret = xdiff_file_patch_binary("original", "patch", "new");
if (!$ret) {
throw new Exception("Error applying patch");
}
break;
}
// Check MD5 hash
if (md5_file("new") != $info->hash) {
$cleanup();
Z_HTTP::e409("Patched file does not match hash");
}
// Check file size
if (filesize("new") != $info->size) {
$cleanup();
Z_HTTP::e409("Patched file size does not match (" . filesize("new") . " != {$info->size})");
}
// If ZIP, make sure it's a ZIP
if ($info->zip && file_get_contents("new", false, null, 0, 4) != "PK" . chr(03) . chr(04)) {
$cleanup();
Z_HTTP::e409("Patched file is not a ZIP file");
}
// Upload to S3
$t = $info->contentType . ($info->contentType && $info->charset ? "; charset={$info->charset}" : "");
$storageFileID = Zotero_S3::uploadFile($info, "new", $t);
} catch (Exception $e) {
//$cleanup();
throw $e;
}
return $storageFileID;
}
