+<?php
+/**
+ * @copyright Copyright (C) 2010-2021, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program 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.
+ *
+ * This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Model\Post;
+
+use Friendica\Core\Logger;
+use Friendica\Database\DBA;
+use Friendica\DI;
+use Friendica\Util\Proxy;
+
+/**
+ * Class Link
+ *
+ * This Model class handles post related external links
+ */
+class Link
+{
+ public static function getByLink(int $uri_id, string $url, $size = '')
+ {
+ if (empty($url) || Proxy::isLocalImage($url)) {
+ return $url;
+ }
+
+ $link = DBA::selectFirst('post-link', ['id'], ['uri-id' => $uri_id, 'url' => $url]);
+ if (!empty($link['id'])) {
+ $id = $link['id'];
+ Logger::info('Found', ['id' => $id, 'url' => $url]);
+ } else {
+ $mime = self::fetchMimeType($url);
+
+ DBA::insert('post-link', ['uri-id' => $uri_id, 'url' => $url, 'mimetype' => $mime]);
+ $id = DBA::lastInsertId();
+ Logger::info('Inserted', ['id' => $id, 'url' => $url]);
+ }
+
+ if (empty($id)) {
+ return $url;
+ }
+
+ $url = DI::baseUrl() . '/photo/link/';
+ switch ($size) {
+ case Proxy::SIZE_MICRO:
+ $url .= Proxy::PIXEL_MICRO . '/';
+ break;
+ case Proxy::SIZE_THUMB:
+ $url .= Proxy::PIXEL_THUMB . '/';
+ break;
+ case Proxy::SIZE_SMALL:
+ $url .= Proxy::PIXEL_SMALL . '/';
+ break;
+ case Proxy::SIZE_MEDIUM:
+ $url .= Proxy::PIXEL_MEDIUM . '/';
+ break;
+ case Proxy::SIZE_LARGE:
+ $url .= Proxy::PIXEL_LARGE . '/';
+ break;
+ }
+ return $url . $id;
+ }
+
+ private static function fetchMimeType(string $url)
+ {
+ $timeout = DI::config()->get('system', 'xrd_timeout');
+ $curlResult = DI::httpRequest()->head($url, ['timeout' => $timeout]);
+ if ($curlResult->isSuccess()) {
+ if (empty($media['mimetype'])) {
+ return $curlResult->getHeader('Content-Type');
+ }
+ }
+ return '';
+ }
+
+ /**
+ * Add external links and replace them in the body
+ *
+ * @param integer $uriid
+ * @param string $body
+ * @return string Body with replaced links
+ */
+ public static function insertFromBody(int $uriid, string $body)
+ {
+ if (preg_match_all("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", $body, $pictures, PREG_SET_ORDER)) {
+ foreach ($pictures as $picture) {
+ $body = str_replace($picture[3], self::getByLink($uriid, $picture[3]), $body);
+ }
+ }
+
+ if (preg_match_all("/\[img=([^\[\]]*)\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures, PREG_SET_ORDER)) {
+ foreach ($pictures as $picture) {
+ if (parse_url($picture[1], PHP_URL_SCHEME)) {
+ $body = str_replace($picture[1], self::getByLink($uriid, $picture[1]), $body);
+ }
+ }
+ }
+
+ if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/ism", $body, $pictures, PREG_SET_ORDER)) {
+ foreach ($pictures as $picture) {
+ $body = str_replace($picture[1], self::getByLink($uriid, $picture[1]), $body);
+ }
+ }
+
+ return trim($body);
+ }
+}