<?php

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/*

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* This file is part of the ManageWP Worker plugin.

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*

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* (c) ManageWP LLC <contact@managewp.com>

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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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class MWP_Action_IncrementalBackup_HashFiles extends MWP_Action_IncrementalBackup_AbstractFiles

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{

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// 100MB

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const UNIX_HASH_THRESHOLD = 104857600;

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// 100KB

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const MAX_CHUNK_SIZE = 102400;

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public function execute(array $params = array(), MWP_Worker_Request $request)

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{

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$hashComputer = new MWP_IncrementalBackup_HashComputer();

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/**

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* Each file is structured like:

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* [

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* "relativePath" => file path relative to ABSPATH,

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* "pathEncoded" => is path url encoded?,

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* "size" => file size sent for reference,

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* "offset" => number of bytes to offset hash start (integer, optional, default 0),

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* "limit" => number of bytes to hash (integer, optional, default 0),

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* "forcePartialHashing" => partially hashes file instead of md5_file always (boolean, optional, default false),

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* ]

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*/

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$files = $params['files'];

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$result = array();

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// Allow overriding max chunk byte size per request for doing partial hashes

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$chunkByteSize = isset($params['maxChunkByteSize']) ? $params['maxChunkByteSize'] : self::MAX_CHUNK_SIZE;

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$hashComputer->setMaxChunkByteSize($chunkByteSize);

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$unixHashThreshold = isset($params['unixMd5Threshold']) ? $params['unixMd5Threshold'] : self::UNIX_HASH_THRESHOLD;

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foreach ($files as $file) {

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$relativePath = $file['path'];

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$size = $file['size'];

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$offset = isset($file['offset']) ? $file['offset'] : 0;

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$limit = isset($file['limit']) ? $file['limit'] : 0;

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$forcePartial = isset($file['forcePartialHashing']) ? $file['forcePartialHashing'] : false;

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$decodedRelativePath = $file['pathEncoded'] ? $this->pathDecode($relativePath) : $relativePath;

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$realPath = $this->getRealPath($decodedRelativePath);

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// Run a unix command to generate md5 hash if file size exceeds threshold

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// Ignore partial requests for big files because of speed problems

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if ($size > $unixHashThreshold && $offset === 0 && $limit === 0) {

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$hash = $hashComputer->computeUnixMd5Sum($realPath);

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if ($hash !== null) {

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$result[] = array(

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'path' => $relativePath,

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'hash' => $hash,

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);

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continue;

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}

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// In case of a failed hashing fall back bellow to compute md5 hash from PHP

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}

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$hash = $hashComputer->computeMd5Hash($realPath, $offset, $limit, $forcePartial);

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$result[] = array(

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'path' => $relativePath,

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'hash' => $hash,

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);

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}

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return $this->createResult(array(

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'files' => $result,

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));

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}

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}

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