280 lines
8.4 KiB
PHP
280 lines
8.4 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* @copyright Copyright (c) 2022 Varun Patil <radialapps@gmail.com>
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* @author Varun Patil <radialapps@gmail.com>
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* @license AGPL-3.0-or-later
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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namespace OCA\Memories\Controller;
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use bantu\IniGetWrapper\IniGetWrapper;
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use OCP\AppFramework\Http;
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use OCP\AppFramework\Http\JSONResponse;
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use OCP\ISession;
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use OCP\Security\ISecureRandom;
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class DownloadController extends ApiBase
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{
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/**
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* @NoAdminRequired
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*
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* @PublicPage
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*
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* @UseSession
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*
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* Request to download one or more files
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*/
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public function request(): JSONResponse
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{
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// Get ids from body
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$files = $this->request->getParam('files');
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if (null === $files || !\is_array($files)) {
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return new JSONResponse([], Http::STATUS_BAD_REQUEST);
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}
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// Return id
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$handle = self::createHandle('memories', $files);
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return new JSONResponse(['handle' => $handle]);
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}
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/**
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* Get a handle for downloading files.
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*
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* The calling controller must have the UseSession annotation.
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*
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* @param string $name Name of zip file
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* @param int[] $files
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*/
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public static function createHandle(string $name, array $files): string
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{
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$handle = \OC::$server->get(ISecureRandom::class)->generate(16, ISecureRandom::CHAR_ALPHANUMERIC);
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\OC::$server->get(ISession::class)->set("memories_download_{$handle}", [$name, $files]);
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return $handle;
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}
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/**
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* @NoAdminRequired
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*
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* @NoCSRFRequired
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*
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* @PublicPage
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*
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* Download one or more files
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*/
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public function file(string $handle): Http\Response
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{
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// Get ids from request
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$session = \OC::$server->get(ISession::class);
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$key = "memories_download_{$handle}";
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$info = $session->get($key);
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$session->remove($key);
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if (null === $info) {
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return new JSONResponse([], Http::STATUS_NOT_FOUND);
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}
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$name = $info[0].'-'.date('YmdHis');
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$fileIds = $info[1];
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/** @var int[] $fileIds */
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$fileIds = array_filter(array_map('intval', $fileIds), function (int $id): bool {
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return $id > 0;
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});
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// Check if we have any valid ids
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if (0 === \count($fileIds)) {
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return new JSONResponse([], Http::STATUS_NOT_FOUND);
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}
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// Download single file
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if (1 === \count($fileIds)) {
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return $this->one($fileIds[0]);
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}
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// Download multiple files
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$this->multiple($name, $fileIds); // exits
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}
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/**
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* @NoAdminRequired
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*
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* @NoCSRFRequired
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*
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* @PublicPage
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*/
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public function one(int $fileid): Http\Response
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{
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$file = $this->getUserFile($fileid);
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if (null === $file) {
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return new JSONResponse([
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'message' => 'File not found',
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], Http::STATUS_NOT_FOUND);
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}
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// Get the owner's root folder
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$owner = $file->getOwner()->getUID();
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$userFolder = $this->rootFolder->getUserFolder($owner);
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// Get the file in the context of the owner
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$ownerFile = $userFolder->getById($fileid);
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if (0 === \count($ownerFile)) {
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// This should never happen, since the file was already found earlier
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// Except if it was deleted in the meantime ...
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return new JSONResponse([
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'message' => 'File not found in owner\'s root folder',
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], Http::STATUS_INTERNAL_SERVER_ERROR);
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}
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// Get DAV path of file relative to owner's root folder
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$path = $userFolder->getRelativePath($ownerFile[0]->getPath());
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if (null === $path) {
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return new JSONResponse([
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'message' => 'File path not found in owner\'s root folder',
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], Http::STATUS_INTERNAL_SERVER_ERROR);
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}
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// Setup filesystem for owner
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\OC_Util::tearDownFS();
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\OC_Util::setupFS($owner);
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// HEAD and RANGE support
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$server_params = ['head' => 'HEAD' === $this->request->getMethod()];
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if (isset($_SERVER['HTTP_RANGE'])) {
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$server_params['range'] = $this->request->getHeader('Range');
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}
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// Write file to output and exit
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\OC_Files::get(\dirname($path), basename($path), $server_params);
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exit;
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}
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/**
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* Download multiple files.
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*
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* @param string $name Name of zip file
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* @param int[] $fileIds
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*/
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private function multiple(string $name, array &$fileIds)
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{
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// Disable time limit
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$executionTime = (int) \OC::$server->get(IniGetWrapper::class)->getNumeric('max_execution_time');
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@set_time_limit(0);
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// Ensure we can abort the request if user stops it
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ignore_user_abort(true);
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// Pretend the size is huge so forced zip64
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// Lookup the constructor of \OC\Streamer for more info
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$size = \count($fileIds) * 1024 * 1024 * 1024 * 8;
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$streamer = new \OC\Streamer($this->request, $size, \count($fileIds));
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// Create a zip file
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$streamer->sendHeaders($name);
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// Multiple files might have the same name
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// So we need to add a number to the end of the name
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$nameCounts = [];
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// Send each file
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foreach ($fileIds as $fileId) {
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if (connection_aborted()) {
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break;
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}
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/** @var bool|resource */
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$handle = false;
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/** @var ?File */
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$file = null;
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/** @var ?string */
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$name = (string) $fileId;
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try {
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// This checks permissions
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$file = $this->getUserFile($fileId);
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if (null === $file) {
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throw new \Exception('File not found');
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}
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$name = $file->getName();
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// Open file
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$handle = $file->fopen('rb');
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if (false === $handle) {
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throw new \Exception('Failed to open file');
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}
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// Handle duplicate names
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if (isset($nameCounts[$name])) {
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++$nameCounts[$name];
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// add count before extension
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$extpos = strrpos($name, '.');
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if (false === $extpos) {
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$name .= " ({$nameCounts[$name]})";
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} else {
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$name = substr($name, 0, $extpos)." ({$nameCounts[$name]})".substr($name, $extpos);
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}
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} else {
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$nameCounts[$name] = 0;
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}
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// Add file to zip
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if (!$streamer->addFileFromStream(
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$handle,
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$name,
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$file->getSize(),
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$file->getMTime(),
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)) {
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throw new \Exception('Failed to add file to zip');
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}
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} catch (\Exception $e) {
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// create a dummy memory file with the error message
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$dummy = fopen('php://memory', 'rw+');
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fwrite($dummy, $e->getMessage());
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rewind($dummy);
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$streamer->addFileFromStream(
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$dummy,
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"{$name}_error.txt",
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\strlen($e->getMessage()),
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time(),
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);
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// close the dummy file
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fclose($dummy);
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} finally {
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if (false !== $handle) {
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fclose($handle);
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}
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}
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}
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// Restore time limit
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@set_time_limit($executionTime);
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// Done
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$streamer->finalize();
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exit;
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}
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}
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