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335 lines
10 KiB
335 lines
10 KiB
2 years ago
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<?php
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/**
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* Interface for the zip extension
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*/
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declare(strict_types=1);
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namespace PhpMyAdmin;
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use ZipArchive;
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use function __;
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use function array_combine;
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use function count;
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use function crc32;
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use function getdate;
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use function gzcompress;
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use function implode;
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use function is_array;
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use function is_string;
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use function pack;
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use function preg_match;
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use function sprintf;
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use function str_replace;
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use function strcmp;
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use function strlen;
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use function strpos;
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use function substr;
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/**
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* Transformations class
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*/
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class ZipExtension
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{
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/** @var ZipArchive|null */
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private $zip;
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public function __construct(?ZipArchive $zip = null)
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{
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$this->zip = $zip;
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}
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/**
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* Gets zip file contents
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*
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* @param string $file path to zip file
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* @param string $specificEntry regular expression to match a file
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*
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* @return array ($error_message, $file_data); $error_message
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* is empty if no error
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*/
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public function getContents($file, $specificEntry = null)
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{
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/**
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* This function is used to "import" a SQL file which has been exported earlier
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* That means that this function works on the assumption that the zip file contains only a single SQL file
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* It might also be an ODS file, look below
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*/
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if ($this->zip === null) {
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return [
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'error' => sprintf(__('The %s extension is missing. Please check your PHP configuration.'), 'zip'),
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'data' => '',
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];
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}
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$errorMessage = '';
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$fileData = '';
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$res = $this->zip->open($file);
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if ($res !== true) {
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$errorMessage = __('Error in ZIP archive:') . ' ' . $this->zip->getStatusString();
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$this->zip->close();
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return [
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'error' => $errorMessage,
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'data' => $fileData,
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];
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}
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if ($this->zip->numFiles === 0) {
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$errorMessage = __('No files found inside ZIP archive!');
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$this->zip->close();
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return [
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'error' => $errorMessage,
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'data' => $fileData,
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];
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}
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/* Is the the zip really an ODS file? */
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$odsMediaType = 'application/vnd.oasis.opendocument.spreadsheet';
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$firstZipEntry = $this->zip->getFromIndex(0);
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if (! strcmp($odsMediaType, (string) $firstZipEntry)) {
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$specificEntry = '/^content\.xml$/';
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}
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if (! isset($specificEntry)) {
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$fileData = $firstZipEntry;
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$this->zip->close();
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return [
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'error' => $errorMessage,
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'data' => $fileData,
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];
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}
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/* Return the correct contents, not just the first entry */
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for ($i = 0; $i < $this->zip->numFiles; $i++) {
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if (preg_match($specificEntry, (string) $this->zip->getNameIndex($i))) {
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$fileData = $this->zip->getFromIndex($i);
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break;
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}
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}
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/* Couldn't find any files that matched $specific_entry */
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if (empty($fileData)) {
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$errorMessage = __('Error in ZIP archive:')
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. ' Could not find "' . $specificEntry . '"';
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}
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$this->zip->close();
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return [
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'error' => $errorMessage,
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'data' => $fileData,
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];
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}
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/**
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* Returns the filename of the first file that matches the given $file_regexp.
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*
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* @param string $file path to zip file
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* @param string $regex regular expression for the file name to match
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*
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* @return string|false the file name of the first file that matches the given regular expression
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*/
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public function findFile($file, $regex)
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{
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if ($this->zip === null) {
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return false;
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}
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$res = $this->zip->open($file);
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if ($res === true) {
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for ($i = 0; $i < $this->zip->numFiles; $i++) {
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if (preg_match($regex, (string) $this->zip->getNameIndex($i))) {
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$filename = $this->zip->getNameIndex($i);
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$this->zip->close();
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return $filename;
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}
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}
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}
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return false;
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}
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/**
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* Returns the number of files in the zip archive.
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*
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* @param string $file path to zip file
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*
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* @return int the number of files in the zip archive or 0, either if there weren't any files or an error occurred.
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*/
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public function getNumberOfFiles($file)
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{
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if ($this->zip === null) {
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return 0;
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}
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$num = 0;
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$res = $this->zip->open($file);
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if ($res === true) {
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$num = $this->zip->numFiles;
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}
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return $num;
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}
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/**
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* Extracts the content of $entry.
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*
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* @param string $file path to zip file
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* @param string $entry file in the archive that should be extracted
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*
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* @return string|false data on success, false otherwise
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*/
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public function extract($file, $entry)
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{
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if ($this->zip === null) {
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return false;
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}
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if ($this->zip->open($file) === true) {
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$result = $this->zip->getFromName($entry);
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$this->zip->close();
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return $result;
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}
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return false;
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}
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/**
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* Creates a zip file.
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* If $data is an array and $name is a string, the filenames will be indexed.
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* The function will return false if $data is a string but $name is an array
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* or if $data is an array and $name is an array, but they don't have the
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* same amount of elements.
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*
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* @param array|string $data contents of the file/files
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* @param array|string $name name of the file/files in the archive
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* @param int $time the current timestamp
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*
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* @return string|bool the ZIP file contents, or false if there was an error.
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*/
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public function createFile($data, $name, $time = 0)
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{
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$datasec = []; // Array to store compressed data
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$ctrlDir = []; // Central directory
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$oldOffset = 0; // Last offset position
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$eofCtrlDir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; // End of central directory record
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if (is_string($data) && is_string($name)) {
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$data = [$name => $data];
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} elseif (is_array($data) && is_string($name)) {
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$extPos = (int) strpos($name, '.');
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$extension = substr($name, $extPos);
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$newData = [];
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foreach ($data as $key => $value) {
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$newName = str_replace($extension, '_' . $key . $extension, $name);
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$newData[$newName] = $value;
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}
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$data = $newData;
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} elseif (is_array($data) && is_array($name) && count($data) === count($name)) {
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/** @var array $data */
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$data = array_combine($name, $data);
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} else {
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return false;
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}
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foreach ($data as $table => $dump) {
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$tempName = str_replace('\\', '/', $table);
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/* Get Local Time */
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$timearray = getdate();
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if ($timearray['year'] < 1980) {
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$timearray['year'] = 1980;
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$timearray['mon'] = 1;
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$timearray['mday'] = 1;
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$timearray['hours'] = 0;
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$timearray['minutes'] = 0;
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$timearray['seconds'] = 0;
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}
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$time = $timearray['year'] - 1980 << 25
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| ($timearray['mon'] << 21)
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| ($timearray['mday'] << 16)
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| ($timearray['hours'] << 11)
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| ($timearray['minutes'] << 5)
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| ($timearray['seconds'] >> 1);
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$hexdtime = pack('V', $time);
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$uncLen = strlen($dump);
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$crc = crc32($dump);
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$zdata = (string) gzcompress($dump);
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$zdata = substr((string) substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
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$cLen = strlen($zdata);
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$fr = "\x50\x4b\x03\x04"
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. "\x14\x00" // ver needed to extract
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. "\x00\x00" // gen purpose bit flag
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. "\x08\x00" // compression method
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. $hexdtime // last mod time and date
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// "local file header" segment
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. pack('V', $crc) // crc32
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. pack('V', $cLen) // compressed filesize
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. pack('V', $uncLen) // uncompressed filesize
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. pack('v', strlen($tempName)) // length of filename
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. pack('v', 0) // extra field length
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. $tempName
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// "file data" segment
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. $zdata;
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$datasec[] = $fr;
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// now add to central directory record
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$cdrec = "\x50\x4b\x01\x02"
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. "\x00\x00" // version made by
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. "\x14\x00" // version needed to extract
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. "\x00\x00" // gen purpose bit flag
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. "\x08\x00" // compression method
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. $hexdtime // last mod time & date
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. pack('V', $crc) // crc32
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. pack('V', $cLen) // compressed filesize
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. pack('V', $uncLen) // uncompressed filesize
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. pack('v', strlen($tempName)) // length of filename
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. pack('v', 0) // extra field length
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. pack('v', 0) // file comment length
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. pack('v', 0) // disk number start
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. pack('v', 0) // internal file attributes
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. pack('V', 32) // external file attributes
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// - 'archive' bit set
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. pack('V', $oldOffset) // relative offset of local header
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. $tempName; // filename
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$oldOffset += strlen($fr);
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// optional extra field, file comment goes here
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// save to central directory
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$ctrlDir[] = $cdrec;
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}
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/* Build string to return */
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$tempCtrlDir = implode('', $ctrlDir);
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$header = $tempCtrlDir .
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$eofCtrlDir .
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pack('v', count($ctrlDir)) . //total #of entries "on this disk"
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pack('v', count($ctrlDir)) . //total #of entries overall
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pack('V', strlen($tempCtrlDir)) . //size of central dir
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pack('V', $oldOffset) . //offset to start of central dir
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"\x00\x00"; //.zip file comment length
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$data = implode('', $datasec);
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return $data . $header;
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}
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}
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