198 lines
6.5 KiB
PHP
198 lines
6.5 KiB
PHP
<?php
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/**
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* This is the implementation of the server side part of
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* Flow.js client script, which sends/uploads files
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* to a server in several chunks.
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*
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* The script receives the files in a standard way as if
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* the files were uploaded using standard HTML form (multipart).
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*
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* This PHP script stores all the chunks of a file in a temporary
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* directory (`temp`) with the extension `_part<#ChunkN>`. Once all
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* the parts have been uploaded, a final destination file is
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* being created from all the stored parts (appending one by one).
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*
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* @author Buster "Silver Eagle" Neece
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* @email buster@busterneece.com
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*
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* @author Gregory Chris (http://online-php.com)
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* @email www.online.php@gmail.com
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*
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* @editor Bivek Joshi (http://www.bivekjoshi.com.np)
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* @email meetbivek@gmail.com
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*/
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namespace App\Service;
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use Psr\Http\Message\UploadedFileInterface;
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use App\Http\Request;
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use App\Http\Response;
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class Flow
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{
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/** @var Request */
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protected $request;
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/** @var Response */
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protected $response;
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/** @var string */
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protected $temp_dir;
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public function __construct(Request $request, Response $response, $temp_dir = null)
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{
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$this->request = $request;
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$this->response = $response;
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if (null === $temp_dir) {
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$temp_dir = sys_get_temp_dir().'/uploads/';
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}
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$this->temp_dir = $temp_dir;
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}
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/**
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* Process the request and return a response if necessary, or the completed file details if successful.
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*
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* @return Response|array|null
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* @throws \Azura\Exception
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*/
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public function process()
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{
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$flowIdentifier = $this->request->getParam('flowIdentifier', '');
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$flowChunkNumber = (int)$this->request->getParam('flowChunkNumber', '');
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$flowFilename = $this->request->getParam('flowFilename', $flowIdentifier ?: 'upload-'.date('Ymd'));
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// init the destination file (format <filename.ext>.part<#chunk>
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$chunkBaseDir = $this->temp_dir . '/' . $flowIdentifier;
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$chunkPath = $chunkBaseDir . '/' . $flowIdentifier . '.part' . $flowChunkNumber;
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$currentChunkSize = (int)$this->request->getParam('flowCurrentChunkSize', 0);
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$targetSize = (int)$this->request->getParam('flowTotalSize', 0);
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$targetChunks = (int)$this->request->getParam('flowTotalChunks', 0);
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// Check if request is GET and the requested chunk exists or not. This makes testChunks work
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if ($this->request->isGet()) {
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// Force a reupload of the last chunk if all chunks are uploaded, to trigger processing below.
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if ($flowChunkNumber !== $targetChunks
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&& file_exists($chunkPath)
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&& filesize($chunkPath) === $currentChunkSize) {
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return $this->response->withStatus(200, 'OK');
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}
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return $this->response->withStatus(204, 'No Content');
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}
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if (!empty($this->request->getUploadedFiles())) {
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$files = $this->request->getUploadedFiles();
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foreach ($files as $file) {
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/** @var UploadedFileInterface $file */
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if ($file->getError() !== UPLOAD_ERR_OK) {
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throw new \Azura\Exception('Error ' . $file->getError() . ' in file ' . $flowFilename);
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}
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// the file is stored in a temporary directory
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if (!is_dir($chunkBaseDir)) {
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@mkdir($chunkBaseDir, 0777, true);
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}
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if ($file->getSize() !== $currentChunkSize) {
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throw new \Azura\Exception('File size of '.$file->getSize().' does not match expected size of '.$currentChunkSize);
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}
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$file->moveTo($chunkPath);
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}
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if ($this->_allPartsExist($chunkBaseDir, $targetSize, $targetChunks)) {
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return $this->_createFileFromChunks($chunkBaseDir, $flowIdentifier, $flowFilename, $targetChunks);
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}
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// Return an OK status to indicate that the chunk upload itself succeeded.
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return $this->response->withStatus(200, 'OK');
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}
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return null;
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}
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/**
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* Check if all parts exist and are uploaded.
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*
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* @param $chunkBaseDir
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* @param $targetSize
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* @param $targetChunkNumber
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* @return bool
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*/
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protected function _allPartsExist($chunkBaseDir, $targetSize, $targetChunkNumber): bool
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{
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$chunkSize = 0;
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$chunkNumber = 0;
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foreach (array_diff(scandir($chunkBaseDir, \SCANDIR_SORT_NONE), array('.', '..')) as $file) {
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$chunkSize += filesize($chunkBaseDir.'/'.$file);
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$chunkNumber++;
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}
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return ($chunkSize === $targetSize && $chunkNumber === $targetChunkNumber);
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}
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/**
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* Reassemble the file on the local destination disk and return the relevant information.
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*
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* @param $chunkBaseDir
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* @param $chunkIdentifier
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* @param $originalFileName
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* @param $numChunks
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* @return array
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*/
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protected function _createFileFromChunks($chunkBaseDir, $chunkIdentifier, $originalFileName, $numChunks): array
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{
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$originalFileName = \Azura\File::sanitizeFileName(basename($originalFileName));
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$finalPath = $this->temp_dir.'/'.$originalFileName;
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$fp = fopen($finalPath, 'w+');
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for ($i = 1; $i <= $numChunks; $i++) {
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fwrite($fp, file_get_contents($chunkBaseDir.'/'.$chunkIdentifier.'.part'.$i));
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}
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fclose($fp);
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// rename the temporary directory (to avoid access from other
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// concurrent chunk uploads) and then delete it.
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if (rename($chunkBaseDir, $chunkBaseDir . '_UNUSED')) {
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$this->_rrmdir($chunkBaseDir . '_UNUSED');
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} else {
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$this->_rrmdir($chunkBaseDir);
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}
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return [
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'path' => $finalPath,
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'filename' => $originalFileName,
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'size' => filesize($finalPath),
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];
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}
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/**
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* Delete a directory RECURSIVELY
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* @param string $dir - directory path
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* @link http://php.net/manual/en/function.rmdir.php
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*/
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protected function _rrmdir($dir): void
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{
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if (is_dir($dir)) {
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$objects = array_diff(scandir($dir, \SCANDIR_SORT_NONE), array('.', '..'));
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foreach ($objects as $object) {
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if (is_dir($dir . '/' . $object)) {
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$this->_rrmdir($dir . '/' . $object);
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} else {
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unlink($dir . '/' . $object);
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}
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}
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reset($objects);
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rmdir($dir);
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}
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}
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}
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