gnu-social/actions/attachment.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/>.
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 AttachmentAction extends ManagedAction
{
/**
* Attachment File object to show
*/
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public $attachment = null;
public $filehash = null;
public $filepath = null;
public $filesize = null;
public $mimetype = null;
public $filename = null;
/**
* Load attributes based on database arguments
*
* Loads all the DB stuff
*
* @param array $args $_REQUEST array
*
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* @return bool flag
* @throws ClientException
* @throws FileNotFoundException
* @throws FileNotStoredLocallyException
* @throws InvalidFilenameException
* @throws ServerException
*/
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protected function prepare(array $args = [])
{
parent::prepare($args);
try {
if (!empty($id = $this->trimmed('attachment'))) {
$this->attachment = File::getByID($id);
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} elseif (!empty($this->filehash = $this->trimmed('filehash'))) {
$this->attachment = File::getByHash($this->filehash);
}
} catch (Exception $e) {
// Not found
}
if (!$this->attachment instanceof File) {
// TRANS: Client error displayed trying to get a non-existing attachment.
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$this->clientError(_m('No such attachment.'), 404);
}
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$this->filepath = $this->attachment->getFileOrThumbnailPath();
if (empty($this->filepath)) {
$this->clientError(_m('Requested local URL for a file that is not stored locally.'), 404);
}
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$this->filesize = $this->attachment->getFileOrThumbnailSize();
$this->mimetype = $this->attachment->getFileOrThumbnailMimetype();
$this->filename = MediaFile::getDisplayName($this->attachment);
return true;
}
/**
* Is this action read-only?
*
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* @return bool true
*/
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public function isReadOnly($args): bool
{
return true;
}
/**
* Title of the page
*
* @return string title of the page
*/
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public function title(): string
{
$a = new Attachment($this->attachment);
return $a->title();
}
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public function showPage(): void
{
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if (empty($this->filepath)) {
// if it's not a local file, gtfo
common_redirect($this->attachment->getUrl(), 303);
}
parent::showPage();
}
/**
* Fill the content area of the page
*
* Shows a single notice list item.
*
* @return void
*/
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public function showContent(): void
{
$ali = new Attachment($this->attachment, $this);
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$ali->show();
}
/**
* Don't show page notice
*
* @return void
*/
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public function showPageNoticeBlock(): void
{
}
/**
* Show aside: this attachments appears in what notices
*
* @return void
*/
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public function showSections(): void
{
$ns = new AttachmentNoticeSection($this);
$ns->show();
}
/**
* Last-modified date for file
*
* @return int last-modified date as unix timestamp
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* @throws ServerException
*/
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public function lastModified(): ?int
{
if (common_config('site', 'use_x_sendfile')) {
return null;
}
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$path = $this->filepath;
if (!empty($path)) {
return filemtime($path);
} else {
return null;
}
}
/**
* etag header for file
*
* This returns the same data (inode, size, mtime) as Apache would,
* but in decimal instead of hex.
*
* @return string etag http header
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* @throws ServerException
*/
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public function etag(): string
{
if (common_config('site', 'use_x_sendfile')) {
return null;
}
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$path = $this->filepath;
$cache = Cache::instance();
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if ($cache) {
if (empty($path)) {
return null;
}
$key = Cache::key('attachments:etag:' . $path);
$etag = $cache->get($key);
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if ($etag === false) {
$etag = crc32(file_get_contents($path));
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$cache->set($key, $etag);
}
return $etag;
}
if (!empty($path)) {
$stat = stat($path);
return '"' . $stat['ino'] . '-' . $stat['size'] . '-' . $stat['mtime'] . '"';
} else {
return null;
}
}
/**
* Include $filepath in the response, for viewing and downloading.
* If provided, $filesize is used to size the HTTP request,
* otherwise it's value is calculated
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* @throws ServerException
*/
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public function sendFile(): void
{
if (is_string(common_config('site', 'x-static-delivery'))) {
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$tmp = explode(INSTALLDIR, $this->filepath);
$relative_path = end($tmp);
common_debug("Using Static Delivery with header: '" .
common_config('site', 'x-static-delivery') . ": {$relative_path}'");
header(common_config('site', 'x-static-delivery') . ": {$relative_path}");
} else {
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if (empty($this->filesize)) {
$this->filesize = filesize($this->filepath);
}
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header("Content-Length: {$this->filesize}");
// header('Cache-Control: private, no-transform, no-store, must-revalidate');
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$ret = @readfile($this->filepath);
if ($ret === false) {
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common_log(LOG_ERR, "Couldn't read file at {$this->filepath}.");
} elseif ($ret !== $this->filesize) {
common_log(LOG_ERR, "The lengths of the file as recorded on the DB (or on disk) for the file " .
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"{$this->filepath} differ from what was sent to the user ({$this->filesize} vs {$ret}).");
}
}
}
}