gnu-social/src/Entity/Link.php

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<?php
// {{{ License
// 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/>.
// }}}
namespace App\Entity;
use App\Core\DB\DB;
use App\Core\Entity;
use App\Core\Event;
use App\Core\GSFile;
use App\Core\HTTPClient;
use App\Core\Log;
use App\Util\Common;
use App\Util\Exception\DuplicateFoundException;
use App\Util\Exception\NotFoundException;
use DateTimeInterface;
use InvalidArgumentException;
use Symfony\Component\HttpClient\Exception\ClientException as HTTPClientException;
use Symfony\Component\HttpClient\Exception\TransportException;
/**
* Entity for representing a Link
*
* @category DB
* @package GNUsocial
*
* @author Diogo Peralta Cordeiro <mail@diogo.site>
* @copyright 2021 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class Link extends Entity
{
// {{{ Autocode
// @codeCoverageIgnoreStart
private int $id;
private ?string $url;
private ?string $url_hash;
private ?string $mimetype;
private DateTimeInterface $modified;
public function setId(int $id): self
{
$this->id = $id;
return $this;
}
public function getId(): int
{
return $this->id;
}
public function getUrl(): ?string
{
return $this->url;
}
public function setUrl(?string $url): self
{
$this->url = $url;
return $this;
}
public function setUrlHash(?string $url_hash): self
{
$this->url_hash = $url_hash;
return $this;
}
public function getUrlHash(): ?string
{
return $this->url_hash;
}
public function setMimetype(?string $mimetype): self
{
$this->mimetype = $mimetype;
return $this;
}
public function getMimetype(): ?string
{
return $this->mimetype;
}
public function getMimetypeMajor(): ?string
{
$mime = $this->getMimetype();
return is_null($mime) ? $mime : GSFile::mimetypeMajor($mime);
}
public function getMimetypeMinor(): ?string
{
$mime = $this->getMimetype();
return is_null($mime) ? $mime : GSFile::mimetypeMinor($mime);
}
public function setModified(DateTimeInterface $modified): self
{
$this->modified = $modified;
return $this;
}
public function getModified(): DateTimeInterface
{
return $this->modified;
}
// @codeCoverageIgnoreEnd
// }}} Autocode
const URLHASH_ALGO = 'sha256';
/**
* Create an attachment for the given URL, fetching the mimetype
*
* @param string $url
*
*@throws InvalidArgumentException
* @throws DuplicateFoundException
*
* @return Link
*
*/
public static function getOrCreate(string $url): self
{
if (Common::isValidHttpUrl($url)) {
// If the URL is a local one, do not create a Link to it
if (parse_url($url, PHP_URL_HOST) === $_ENV['SOCIAL_DOMAIN']) {
Log::warning("It was attempted to create a Link to a local location {$url}.");
// Forbidden
throw new InvalidArgumentException(message: "A Link can't point to a local location ({$url}), it must be a remote one", code: 400);
}
try {
$head = HTTPClient::head($url);
// This must come before getInfo given that Symfony HTTPClient is lazy (thus forcing curl exec)
$headers = $head->getHeaders();
// @codeCoverageIgnoreStart
} catch (HTTPClientException | TransportException $e) {
throw new InvalidArgumentException(previous: $e);
// @codeCoverageIgnoreEnd
}
$url = $head->getInfo('url'); // The last effective url (after getHeaders, so it follows redirects)
$url_hash = hash(self::URLHASH_ALGO, $url);
try {
return DB::findOneBy('link', ['url_hash' => $url_hash]);
} catch (NotFoundException) {
$headers = array_change_key_case($headers, CASE_LOWER);
$link = self::create([
'url' => $url,
'url_hash' => $url_hash,
'mimetype' => $headers['content-type'][0],
]);
DB::persist($link);
Event::handle('LinkStoredNew', [&$link]);
return $link;
}
} else {
throw new InvalidArgumentException();
}
}
public static function schemaDef(): array
{
return [
'name' => 'link',
'fields' => [
'id' => ['type' => 'serial', 'not null' => true],
'url' => ['type' => 'text', 'description' => 'URL after following possible redirections'],
'url_hash' => ['type' => 'varchar', 'length' => 64, 'description' => 'sha256 of destination URL (url field)'],
'mimetype' => ['type' => 'varchar', 'length' => 50, 'description' => 'mime type of resource'],
'modified' => ['type' => 'timestamp', 'not null' => true, 'default' => 'CURRENT_TIMESTAMP', 'description' => 'date this record was modified'],
],
'primary key' => ['id'],
'indexes' => [
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'actor_url_hash_idx' => ['url_hash'],
],
];
}
}