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109 lines
2.9 KiB
PHP
109 lines
2.9 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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* @param string $filename
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*
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* @return string|null
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*/
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public static function getComposerJson($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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*
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* @return bool|int
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*/
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private static function locateFile(\ZipArchive $zip, $filename)
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{
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$indexOfShortestMatch = false;
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$lengthOfShortestMatch = -1;
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for ($i = 0; $i < $zip->numFiles; $i++) {
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$stat = $zip->statIndex($i);
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if (strcmp(basename($stat['name']), $filename) === 0) {
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$directoryName = dirname($stat['name']);
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if ($directoryName === '.') {
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//if composer.json is in root directory
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//it has to be the one to use.
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return $i;
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}
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if (strpos($directoryName, '\\') !== false ||
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strpos($directoryName, '/') !== false) {
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//composer.json files below first directory are rejected
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continue;
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}
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$length = strlen($stat['name']);
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if ($indexOfShortestMatch === false || $length < $lengthOfShortestMatch) {
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//Check it's not a directory.
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$contents = $zip->getFromIndex($i);
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if ($contents !== false) {
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$indexOfShortestMatch = $i;
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$lengthOfShortestMatch = $length;
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}
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}
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}
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}
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return $indexOfShortestMatch;
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}
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}
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