New model class for tag

src/Model/Tag.php

@@ -0,0 +1,81 @@
+<?php
+/**
+ * @copyright Copyright (C) 2020, Friendica
+ *
+ * @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;
+
+use Friendica\Core\Logger;
+use Friendica\Database\DBA;
+use Friendica\Content\Text\BBCode;
+
+/**
+ * Class Tag
+ *
+ * This Model class handles tag table interactions.
+ * This tables stores relevant tags related to posts, like hashtags and mentions.
+ */
+class Tag
+{
+    const UNKNOWN           = 0;
+    const HASHTAG           = 1;
+    const MENTION           = 2;
+    const CATEGORY          = 3;
+    const FILE              = 5;
+	/**
+	 * An implicit mention is a mention in a comment body that is redundant with the threading information.
+	 */
+    const IMPLICIT_MENTION  = 8;
+	/**
+	 * An exclusive mention transfers the ownership of the post to the target account, usually a forum.
+	 */
+    const EXCLUSIVE_MENTION = 9;
+
+    const TAG_CHARACTER = [
+    	self::HASHTAG           => '#',
+    	self::MENTION           => '@',
+    	self::IMPLICIT_MENTION  => '%',
+    	self::EXCLUSIVE_MENTION => '!',
+    ];
+
+	/**
+	 * Store tags from the body
+	 *
+	 * @param integer $uriid
+	 * @param string $body
+	 */
+	public static function storeFromBody(int $uriid, string $body)
+	{
+		$tags = BBCode::getTags($body);
+		if (empty($tags)) {
+			return;
+		}
+
+		foreach ($tags as $tag) {
+			if ((substr($tag, 0, 1) != Term::TAG_CHARACTER[Term::HASHTAG]) || (strlen($tag) <= 1)) {
+				Logger::info('Skip tag', ['uriid' => $uriid, 'tag' => $tag]);
+				continue;
+			}
+
+			$fields = ['uri-id' => $uriid, 'name' => substr($tag, 1, 64), 'type' => Term::HASHTAG];
+			DBA::insert('tag', $fields, true);
+			Logger::info('Stored tag', ['uriid' => $uriid, 'tag' => $tag, 'fields' => $fields]);
+		}
+	}
+}