gnu-social/actions/attachment_thumbnail.php

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<?php
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// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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defined('GNUSOCIAL') || die();
/**
* Show notice attachments
*
* @category Personal
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
*/
class Attachment_thumbnailAction extends AttachmentAction
{
protected $thumb_w = null; // max width
protected $thumb_h = null; // max height
protected $thumb_c = null; // crop?
protected function doPreparation()
{
parent::doPreparation();
$this->thumb_w = $this->int('w');
$this->thumb_h = $this->int('h');
$this->thumb_c = $this->boolean('c');
}
/**
* Show an inline representation of an attachment of the size
* requested in the GET variables (read in the constructor). Tries
* to send the most appropriate file with the correct size and
* headers or displays an error if it's not possible.
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* @throws ClientException
* @throws ReflectionException
* @throws ServerException
*/
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public function showPage(): void
{
// Returns a File_thumbnail object or throws exception if not available
try {
$thumbnail = $this->attachment->getThumbnail($this->thumb_w, $this->thumb_h, $this->thumb_c);
$file = $thumbnail->getFile();
} catch (UseFileAsThumbnailException $e) {
// With this exception, the file exists locally
$file = $e->file;
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} catch (FileNotFoundException $e) {
$this->clientError(_m('No such attachment'), 404);
}
// Disable errors, to not mess with the file contents (suppress errors in case access to this
// function is blocked, like in some shared hosts). Automatically reset at the end of the
// script execution, and we don't want to have any more errors until then, so don't reset it
@ini_set('display_errors', 0);
header("Content-Description: File Transfer");
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header("Content-Type: {$this->mimetype}");
header("Content-Disposition: inline; filename=\"{$this->filename}\"");
header('Expires: 0');
header('Content-Transfer-Encoding: binary');
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parent::sendFile();
}
}