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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; under version 2 |
| 7 | * of the License (non-upgradable). |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 17 | * |
| 18 | * Copyright (c) 2021 (original work) Open Assessment Technologies SA ; |
| 19 | */ |
| 20 | |
| 21 | declare(strict_types=1); |
| 22 | |
| 23 | namespace oat\tao\model\media\sourceStrategy; |
| 24 | |
| 25 | use common_Exception; |
| 26 | use GuzzleHttp\Psr7\Stream; |
| 27 | use League\MimeTypeDetection\GeneratedExtensionToMimeTypeMap; |
| 28 | use oat\tao\model\media\MediaBrowser; |
| 29 | use oat\tao\model\media\mediaSource\DirectorySearchQuery; |
| 30 | use RuntimeException; |
| 31 | |
| 32 | class InlineSource implements MediaBrowser |
| 33 | { |
| 34 | public const FILENAME_PREFIX = 'inline-media-'; |
| 35 | |
| 36 | public function getDirectories(DirectorySearchQuery $params): array |
| 37 | { |
| 38 | throw new common_Exception(__FUNCTION__ . ' not implemented'); |
| 39 | } |
| 40 | |
| 41 | public function getDirectory($parentLink = '/', $acceptableMime = [], $depth = 1) |
| 42 | { |
| 43 | throw new common_Exception(__FUNCTION__ . ' not implemented'); |
| 44 | } |
| 45 | |
| 46 | public function getFileInfo($link) |
| 47 | { |
| 48 | throw new common_Exception(__FUNCTION__ . ' not implemented'); |
| 49 | } |
| 50 | |
| 51 | public function download($link) |
| 52 | { |
| 53 | $stream = $this->getFileStream($link); |
| 54 | |
| 55 | return $stream->getContents(); |
| 56 | } |
| 57 | |
| 58 | public function getFileStream($link) |
| 59 | { |
| 60 | return new Stream($this->createResource($link)); |
| 61 | } |
| 62 | |
| 63 | public function getBaseName($link) |
| 64 | { |
| 65 | return self::FILENAME_PREFIX . md5($link) . '.' . $this->detectFileExtension($link); |
| 66 | } |
| 67 | |
| 68 | private function detectFileExtension($link): ?string |
| 69 | { |
| 70 | $stream = $this->getFileStream($link); |
| 71 | $mimetype = $stream->getMetadata('mediatype'); |
| 72 | $extension = array_search($mimetype, GeneratedExtensionToMimeTypeMap::MIME_TYPES_FOR_EXTENSIONS); |
| 73 | if (!$extension) { |
| 74 | throw new RuntimeException( |
| 75 | sprintf('Could not determined inline asset file extension from the mime type: %s.', $mimetype) |
| 76 | ); |
| 77 | } |
| 78 | |
| 79 | return $extension; |
| 80 | } |
| 81 | |
| 82 | private function createResource($link) |
| 83 | { |
| 84 | $this->verifyDataUrlScheme($link); |
| 85 | |
| 86 | $resource = @fopen($link, 'r'); |
| 87 | if (!$resource) { |
| 88 | throw new RuntimeException('Invalid Data URL, could not create a resource.'); |
| 89 | } |
| 90 | |
| 91 | return $resource; |
| 92 | } |
| 93 | |
| 94 | private function verifyDataUrlScheme($link): void |
| 95 | { |
| 96 | $urlScheme = parse_url($link, PHP_URL_SCHEME); |
| 97 | if ($urlScheme !== 'data') { |
| 98 | throw new RuntimeException('Provided URL should match the Data (RFC 2397) scheme.'); |
| 99 | } |
| 100 | } |
| 101 | } |