115 lines
3.5 KiB
PHP
115 lines
3.5 KiB
PHP
<?php
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/*
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* This file is part of Composer.
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*
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* (c) Nils Adermann <naderman@naderman.de>
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* Jordi Boggiano <j.boggiano@seld.be>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Composer\Util;
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/**
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* @author Andreas Schempp <andreas.schempp@terminal42.ch>
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*/
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class Zip
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{
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/**
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* Gets content of the root composer.json inside a ZIP archive.
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*
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* @param string $pathToZip
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*
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* @return string|null
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*/
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public static function getComposerJson($pathToZip)
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{
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if (!extension_loaded('zip')) {
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throw new \RuntimeException('The Zip Util requires PHP\'s zip extension');
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}
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$zip = new \ZipArchive();
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if ($zip->open($pathToZip) !== true) {
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return null;
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}
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if (0 == $zip->numFiles) {
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$zip->close();
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return null;
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}
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$foundFileIndex = self::locateFile($zip, 'composer.json');
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if (false === $foundFileIndex) {
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$zip->close();
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return null;
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}
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$content = null;
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$configurationFileName = $zip->getNameIndex($foundFileIndex);
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$stream = $zip->getStream($configurationFileName);
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if (false !== $stream) {
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$content = stream_get_contents($stream);
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}
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$zip->close();
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return $content;
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}
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/**
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* Find a file by name, returning the one that has the shortest path.
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*
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* @param \ZipArchive $zip
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* @param string $filename
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* @throws \RuntimeException
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*
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* @return int
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*/
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private static function locateFile(\ZipArchive $zip, $filename)
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{
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// return root composer.json if it is there and is a file
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if (false !== ($index = $zip->locateName($filename)) && $zip->getFromIndex($index) !== false) {
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return $index;
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}
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$topLevelPaths = array();
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for ($i = 0; $i < $zip->numFiles; $i++) {
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$name = $zip->getNameIndex($i);
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$dirname = dirname($name);
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// ignore OSX specific resource fork folder
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if (strpos($name, '__MACOSX') !== false) {
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continue;
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}
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// handle archives with proper TOC
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if ($dirname === '.') {
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$topLevelPaths[$name] = true;
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if (\count($topLevelPaths) > 1) {
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throw new \RuntimeException('Archive has more than one top level directories, and no composer.json was found on the top level, so it\'s an invalid archive. Top level paths found were: '.implode(',', array_keys($topLevelPaths)));
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}
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continue;
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}
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// handle archives which do not have a TOC record for the directory itself
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if (false === strpos($dirname, '\\') && false === strpos($dirname, '/')) {
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$topLevelPaths[$dirname.'/'] = true;
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if (\count($topLevelPaths) > 1) {
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throw new \RuntimeException('Archive has more than one top level directories, and no composer.json was found on the top level, so it\'s an invalid archive. Top level paths found were: '.implode(',', array_keys($topLevelPaths)));
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}
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}
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}
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if ($topLevelPaths && false !== ($index = $zip->locateName(key($topLevelPaths).$filename)) && $zip->getFromIndex($index) !== false) {
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return $index;
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}
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throw new \RuntimeException('No composer.json found either at the top level or within the topmost directory');
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}
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}
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