New struture for post related links

src/Model/Item.php

@@ -2755,6 +2755,7 @@ class Item
 		}
 		$attachments = Post\Media::splitAttachments($item['uri-id'], $item['guid'] ?? '', $shared_links);
 		$item['body'] = self::replaceVisualAttachments($attachments, $item['body'] ?? '');
+		$item['body'] = Post\Link::insertFromBody($item['uri-id'], $item['body']);
 
 		$item['body'] = preg_replace("/\s*\[attachment .*?\].*?\[\/attachment\]\s*/ism", "\n", $item['body']);
 		self::putInCache($item);
@@ -2780,13 +2781,13 @@ class Item
 
 		if (!empty($shared_attachments)) {
 			$s = self::addVisualAttachments($shared_attachments, $item, $s, true);
-			$s = self::addLinkAttachment($shared_attachments, $body, $s, true, []);
+			$s = self::addLinkAttachment($shared_uri_id, $shared_attachments, $body, $s, true, []);
 			$s = self::addNonVisualAttachments($shared_attachments, $item, $s, true);
 			$body = preg_replace("/\s*\[share .*?\].*?\[\/share\]\s*/ism", '', $body);
 		}
 
 		$s = self::addVisualAttachments($attachments, $item, $s, false);
-		$s = self::addLinkAttachment($attachments, $body, $s, false, $shared_links);
+		$s = self::addLinkAttachment($item['uri-id'], $attachments, $body, $s, false, $shared_links);
 		$s = self::addNonVisualAttachments($attachments, $item, $s, false);
 
 		// Map.
@@ -2967,7 +2968,7 @@ class Item
 	 * @param array  $ignore_links A list of URLs to ignore
 	 * @return string modified content
 	 */
-	private static function addLinkAttachment(array $attachments, string $body, string $content, bool $shared, array $ignore_links)
+	private static function addLinkAttachment(int $uriid, array $attachments, string $body, string $content, bool $shared, array $ignore_links)
 	{
 		$stamp1 = microtime(true);
 		// @ToDo Check only for audio and video
@@ -3052,6 +3053,14 @@ class Item
 					}
 				}
 
+				if (!empty($data['image'])) {
+					$data['image']   = Post\Link::getByLink($uriid, $data['image']);
+				}
+
+				if (!empty($data['preview'])) {
+					$data['preview'] = Post\Link::getByLink($uriid, $data['preview']);
+				}
+
 				// @todo Use a template
 				$rendered = BBCode::convertAttachment('', BBCode::INTERNAL, false, $data);
 			} elseif (!self::containsLink($content, $data['url'], Post\Media::HTML)) {

src/Model/Post/Link.php

@@ -0,0 +1,122 @@
+<?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);
+	}
+}