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1<?php
2
3// {{{ License
4
5// This file is part of GNU social - https://www.gnu.org/software/social
6//
7// GNU social is free software: you can redistribute it and/or modify
8// it under the terms of the GNU Affero General Public License as published by
9// the Free Software Foundation, either version 3 of the License, or
10// (at your option) any later version.
11//
12// GNU social is distributed in the hope that it will be useful,
13// but WITHOUT ANY WARRANTY; without even the implied warranty of
14// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15// GNU Affero General Public License for more details.
16//
17// You should have received a copy of the GNU Affero General Public License
18// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.
19
20// }}}
21
22namespace App\Entity;
23
24use App\Core\Cache;
25use App\Core\DB\DB;
26use App\Core\Entity;
27use App\Core\Event;
28use App\Core\GSFile;
29use function App\Core\I18n\_m;
30use App\Core\Log;
31use App\Core\Router\Router;
32use App\Util\Common;
33use App\Util\Exception\ClientException;
34use App\Util\Exception\NotFoundException;
35use App\Util\Exception\NotStoredLocallyException;
36use App\Util\Exception\ServerException;
37use DateTimeInterface;
38use Symfony\Component\Mime\MimeTypes;
39
40/**
41 * Entity for Attachment thumbnails
42 *
43 * @category  DB
44 * @package   GNUsocial
45 *
46 * @author    Zach Copley <zach@status.net>
47 * @copyright 2010 StatusNet Inc.
48 * @author    Mikael Nordfeldth <mmn@hethane.se>
49 * @copyright 2009-2014 Free Software Foundation, Inc http://www.fsf.org
50 * @author    Hugo Sales <hugo@hsal.es>
51 * @author    Diogo Peralta Cordeiro <mail@diogo.site>
52 * @copyright 2020-2021 Free Software Foundation, Inc http://www.fsf.org
53 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
54 */
55class AttachmentThumbnail extends Entity
56{
57    // {{{ Autocode
58    // @codeCoverageIgnoreStart
59    private int $attachment_id;
60    private ?string $mimetype;
61    private int $width;
62    private int $height;
63    private string $filename;
64    private \DateTimeInterface $modified;
65
66    public function setAttachmentId(int $attachment_id): self
67    {
68        $this->attachment_id = $attachment_id;
69        return $this;
70    }
71
72    public function getAttachmentId(): int
73    {
74        return $this->attachment_id;
75    }
76
77    public function setMimetype(?string $mimetype): self
78    {
79        $this->mimetype = $mimetype;
80        return $this;
81    }
82
83    public function getMimetype(): ?string
84    {
85        return $this->mimetype;
86    }
87
88    public function setWidth(int $width): self
89    {
90        $this->width = $width;
91        return $this;
92    }
93
94    public function getWidth(): int
95    {
96        return $this->width;
97    }
98
99    public function setHeight(int $height): self
100    {
101        $this->height = $height;
102        return $this;
103    }
104
105    public function getHeight(): int
106    {
107        return $this->height;
108    }
109
110    public function setFilename(string $filename): self
111    {
112        $this->filename = $filename;
113        return $this;
114    }
115
116    public function getFilename(): string
117    {
118        return $this->filename;
119    }
120
121    public function setModified(DateTimeInterface $modified): self
122    {
123        $this->modified = $modified;
124        return $this;
125    }
126
127    public function getModified(): DateTimeInterface
128    {
129        return $this->modified;
130    }
131
132    // @codeCoverageIgnoreEnd
133    // }}} Autocode
134
135    private ?Attachment $attachment = null;
136
137    public function setAttachment(?Attachment $attachment)
138    {
139        $this->attachment = $attachment;
140    }
141
142    public function getAttachment()
143    {
144        if (isset($this->attachment) && !is_null($this->attachment)) {
145            return $this->attachment;
146        } else {
147            return $this->attachment = DB::findOneBy('attachment', ['id' => $this->attachment_id]);
148        }
149    }
150
151    /**
152     * @param Attachment $attachment
153     * @param int        $width
154     * @param int        $height
155     * @param bool       $crop
156     *
157     * @throws ClientException
158     * @throws NotFoundException
159     * @throws ServerException
160     *
161     * @return mixed
162     */
163    public static function getOrCreate(Attachment $attachment, int $width, int $height, bool $crop)
164    {
165        // We need to keep these in mind for DB indexing
166        $predicted_width  = null;
167        $predicted_height = null;
168        try {
169            if (is_null($attachment->getWidth()) || is_null($attachment->getHeight())) {
170                // @codeCoverageIgnoreStart
171                // TODO: check if we can generate from an existing thumbnail
172                throw new ClientException(_m('Invalid dimensions requested for thumbnail.'));
173                // @codeCoverageIgnoreEnd
174            }
175            return Cache::get('thumb-' . $attachment->getId() . "-{$width}x{$height}",
176                function () use ($crop, $attachment, $width, $height, &$predicted_width, &$predicted_height) {
177                    [$predicted_width, $predicted_height] = self::predictScalingValues($attachment->getWidth(), $attachment->getHeight(), $width, $height, $crop);
178                    return DB::findOneBy('attachment_thumbnail', ['attachment_id' => $attachment->getId(), 'width' => $predicted_width, 'height' => $predicted_height]);
179                });
180        } catch (NotFoundException $e) {
181            if (!file_exists($attachment->getPath())) {
182                throw new NotStoredLocallyException();
183            }
184            $thumbnail              = self::create(['attachment_id' => $attachment->getId()]);
185            $mimetype               = $attachment->getMimetype();
186            $event_map[$mimetype]   = [];
187            $major_mime             = GSFile::mimetypeMajor($mimetype);
188            $event_map[$major_mime] = [];
189            Event::handle('FileResizerAvailable', [&$event_map, $mimetype]);
190            // Always prefer specific encoders
191            $encoders = array_merge($event_map[$mimetype], $event_map[$major_mime]);
192            foreach ($encoders as $encoder) {
193                $temp = null; // Let the EncoderPlugin create a temporary file for us
194                if ($encoder($attachment->getPath(), $temp, $width, $height, $crop, $mimetype)) {
195                    $thumbnail->setAttachment($attachment);
196                    $thumbnail->setWidth($predicted_width);
197                    $thumbnail->setHeight($predicted_height);
198                    $ext      = '.' . MimeTypes::getDefault()->getExtensions($temp->getMimeType())[0];
199                    $filename = "{$predicted_width}x{$predicted_height}{$ext}-" . $attachment->getFilehash();
200                    $thumbnail->setFilename($filename);
201                    $thumbnail->setMimetype($mimetype);
202                    DB::persist($thumbnail);
203                    DB::flush();
204                    $temp->move(Common::config('thumbnail', 'dir'), $filename);
205                    return $thumbnail;
206                }
207            }
208            throw new ClientException(_m('Can not generate thumbnail for attachment with id={id}', ['id' => $attachment->getId()]));
209        }
210    }
211
212    public function getPath()
213    {
214        return Common::config('thumbnail', 'dir') . DIRECTORY_SEPARATOR . $this->getFilename();
215    }
216
217    public function getUrl()
218    {
219        return Router::url('attachment_thumbnail', ['id' => $this->getAttachmentId(), 'w' => $this->getWidth(), 'h' => $this->getHeight()]);
220    }
221
222    /**
223     * Get the HTML attributes for this thumbnail
224     */
225    public function getHTMLAttributes(array $orig = [], bool $overwrite = true)
226    {
227        $attrs = [
228            'height' => $this->getHeight(),
229            'width'  => $this->getWidth(),
230            'src'    => $this->getUrl(),
231        ];
232        return $overwrite ? array_merge($orig, $attrs) : array_merge($attrs, $orig);
233    }
234
235    /**
236     * Delete an attachment thumbnail
237     */
238    public function delete(bool $flush = true): void
239    {
240        $filepath = $this->getPath();
241        if (file_exists($filepath)) {
242            if (@unlink($filepath) === false) {
243                // @codeCoverageIgnoreStart
244                Log::warning("Failed deleting file for attachment thumbnail with id={$this->attachment_id}, width={$this->width}, height={$this->height} at {$filepath}");
245                // @codeCoverageIgnoreEnd
246            }
247        }
248        DB::remove($this);
249        if ($flush) {
250            DB::flush();
251        }
252    }
253
254    /**
255     * Gets scaling values for images of various types. Cropping can be enabled.
256     *
257     * Values will scale _up_ to fit max values if cropping is enabled!
258     * With cropping disabled, the max value of each axis will be respected.
259     *
260     * @param $width    int Original width
261     * @param $height   int Original height
262     * @param $maxW     int Resulting max width
263     * @param $maxH     int Resulting max height
264     * @param $crop     bool Crop to the size (not preserving aspect ratio)
265     *
266     * @return array [predicted width, predicted height]
267     */
268    public static function predictScalingValues(
269        int $existing_width,
270        int $existing_height,
271        int $requested_width,
272        int $requested_height,
273        bool $crop
274    ): array {
275        if ($crop) {
276            $rw = min($existing_width, $requested_width);
277            $rh = min($existing_height, $requested_height);
278        } else {
279            if ($existing_width > $existing_height) {
280                $rw = min($existing_width, $requested_width);
281                $rh = ceil($existing_height * $rw / $existing_width);
282            } else {
283                $rh = min($existing_height, $requested_height);
284                $rw = ceil($existing_width * $rh / $existing_height);
285            }
286        }
287
288        return [(int) $rw, (int) $rh];
289    }
290
291    public static function schemaDef(): array
292    {
293        return [
294            'name'   => 'attachment_thumbnail',
295            'fields' => [
296                'attachment_id' => ['type' => 'int', 'foreign key' => true, 'target' => 'Attachment.id', 'multiplicity' => 'one to one', 'not null' => true, 'description' => 'thumbnail for what attachment'],
297                'mimetype'      => ['type' => 'varchar',   'length' => 129,  'description' => 'resource mime type 64+1+64, images hardly will show up with long mimetypes, this is probably safe considering rfc6838#section-4.2'],
298                'width'         => ['type' => 'int', 'not null' => true, 'description' => 'width of thumbnail'],
299                'height'        => ['type' => 'int', 'not null' => true, 'description' => 'height of thumbnail'],
300                'filename'      => ['type' => 'varchar', 'length' => 191, 'not null' => true, 'description' => 'thumbnail filename'],
301                'modified'      => ['type' => 'timestamp', 'not null' => true, 'default' => 'CURRENT_TIMESTAMP', 'description' => 'date this record was modified'],
302            ],
303            'primary key' => ['attachment_id', 'width', 'height'],
304            'indexes'     => [
305                'attachment_thumbnail_attachment_id_idx' => ['attachment_id'],
306            ],
307        ];
308    }
309}