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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Simple FileDownloader class based on Symfony HttpFoundation. |
| 5 | * This class manages the stream of a generic content |
| 6 | * taking into account the correct http headers settings |
| 7 | * |
| 8 | * Currently, it supports only 3 content (mime) types: |
| 9 | * - PDF: application/pdf |
| 10 | * - CSV: text/csv |
| 11 | * - JSON: application/json |
| 12 | * - Generic file: application/octet-stream |
| 13 | * |
| 14 | * This Source Code Form is subject to the terms of the Mozilla Public License, |
| 15 | * v. 2.0. If a copy of the MPL was not distributed with this file, You can |
| 16 | * obtain one at https://mozilla.org/MPL/2.0/. |
| 17 | * |
| 18 | * @package phpMyFAQ |
| 19 | * @author Matteo Scaramuccia <matteo@scaramuccia.com> |
| 20 | * @copyright 2005-2026 phpMyFAQ Team |
| 21 | * @license https://www.mozilla.org/MPL/2.0/ Mozilla Public License Version 2.0 |
| 22 | * @link https://www.phpmyfaq.de |
| 23 | * @since 2005-11-02 |
| 24 | */ |
| 25 | |
| 26 | declare(strict_types=1); |
| 27 | |
| 28 | namespace phpMyFAQ\Administration; |
| 29 | |
| 30 | use DateTime; |
| 31 | use phpMyFAQ\Core\Exception; |
| 32 | use phpMyFAQ\Export; |
| 33 | use Symfony\Component\HttpFoundation\HeaderUtils; |
| 34 | use Symfony\Component\HttpFoundation\Response; |
| 35 | |
| 36 | /** |
| 37 | * Class FileDownloader |
| 38 | * |
| 39 | * @package phpMyFAQ |
| 40 | */ |
| 41 | class FileDownloader |
| 42 | { |
| 43 | /** HTTP Content Disposition. */ |
| 44 | private string $disposition = HeaderUtils::DISPOSITION_INLINE; |
| 45 | |
| 46 | /** HTTP streaming data length. */ |
| 47 | private readonly int $size; |
| 48 | |
| 49 | private Response $response; |
| 50 | |
| 51 | /** |
| 52 | * Constructor. |
| 53 | * |
| 54 | * @param string $type Type |
| 55 | * @param string $content Content |
| 56 | */ |
| 57 | public function __construct( |
| 58 | private readonly string $type, |
| 59 | private readonly string $content, |
| 60 | ) { |
| 61 | $this->size = strlen($this->content); |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Sends data. |
| 66 | * |
| 67 | * @param string $disposition Disposition |
| 68 | * @throws Exception |
| 69 | */ |
| 70 | public function send(string $disposition): void |
| 71 | { |
| 72 | // Sanity checks |
| 73 | if (headers_sent()) { |
| 74 | throw new Exception(message: 'Error: unable to send my headers: someone already sent other headers!'); |
| 75 | } |
| 76 | |
| 77 | if (ob_get_contents()) { |
| 78 | throw new Exception(message: 'Error: unable to send my data: someone already sent other data!'); |
| 79 | } |
| 80 | |
| 81 | $this->getResponse($disposition)->send(); |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Builds the streaming response so it can be returned by a controller and |
| 86 | * sent by the HTTP kernel, instead of being flushed directly to the client. |
| 87 | * |
| 88 | * @param string $disposition Disposition |
| 89 | */ |
| 90 | public function getResponse(string $disposition): Response |
| 91 | { |
| 92 | $this->disposition = $disposition; |
| 93 | |
| 94 | $this->response = new Response(); |
| 95 | $this->setHttpHeaders(); |
| 96 | $this->response->setContent(content: $this->streamContent()); |
| 97 | |
| 98 | return $this->response; |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Sends HTTP Headers. |
| 103 | */ |
| 104 | private function setHttpHeaders(): void |
| 105 | { |
| 106 | // Evaluate data upon export type request |
| 107 | switch ($this->type) { |
| 108 | case 'pdf': |
| 109 | $filename = 'phpmyfaq.pdf'; |
| 110 | $description = 'phpMyFAQ PDF export file'; |
| 111 | $mimeType = 'application/pdf'; |
| 112 | break; |
| 113 | case 'csv': |
| 114 | $filename = 'phpmyfaq.csv'; |
| 115 | $description = 'phpMyFAQ CSV export file'; |
| 116 | $mimeType = 'text/csv'; |
| 117 | break; |
| 118 | case 'json': |
| 119 | $filename = 'phpmyfaq.json'; |
| 120 | $description = 'phpMyFAQ JSON export file'; |
| 121 | $mimeType = 'application/json'; |
| 122 | break; |
| 123 | // In this case, no default statement is required: |
| 124 | // the one above is just for clean coding style |
| 125 | default: |
| 126 | $filename = 'phpmyfaq.pmf'; |
| 127 | $description = 'phpMyFAQ Generic export file'; |
| 128 | $mimeType = 'application/octet-stream'; |
| 129 | break; |
| 130 | } |
| 131 | |
| 132 | $filename = Export::getExportTimestamp() . '_' . $filename; |
| 133 | |
| 134 | // Set the correct HTTP headers: |
| 135 | // 1. Prevent proxies&browsers caching |
| 136 | $this->response->setLastModified(date: new DateTime()); |
| 137 | $this->response->setExpires(date: new DateTime()); |
| 138 | $this->response->setCache(options: [ |
| 139 | 'must_revalidate' => true, |
| 140 | 'no_cache' => true, |
| 141 | 'no_store' => true, |
| 142 | 'no_transform' => false, |
| 143 | 'public' => false, |
| 144 | 'private' => true, |
| 145 | ]); |
| 146 | |
| 147 | // 2. Set the correct values for file streaming |
| 148 | $this->response->headers->set(key: 'Content-Type', values: $mimeType); |
| 149 | |
| 150 | // 3. RFC2616, ยง19.5.1: $filename must be a quoted-string |
| 151 | $disposition = HeaderUtils::makeDisposition(disposition: $this->disposition, filename: $filename); |
| 152 | $this->response->headers->set(key: 'Content-Disposition', values: $disposition); |
| 153 | $this->response->headers->set(key: 'Content-Description', values: $description); |
| 154 | $this->response->headers->set(key: 'Content-Transfer-Encoding', values: 'binary'); |
| 155 | $this->response->headers->set(key: 'Accept-Ranges', values: 'none'); |
| 156 | $this->response->headers->set(key: 'Content-Length', values: (string) $this->size); |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * Streams the content. |
| 161 | */ |
| 162 | private function streamContent(): string |
| 163 | { |
| 164 | return $this->content; |
| 165 | } |
| 166 | } |