From 639a781125aa4dc97b8af480130289cb15025802 Mon Sep 17 00:00:00 2001
From: Michael <heluecht@pirati.ca>
Date: Tue, 9 Mar 2021 22:34:41 +0000
Subject: [PATCH] Block tags from the trending tags

---
 src/Model/Tag.php          | 25 +++++++++++++++++++++++--
 static/defaults.config.php |  4 ++++
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/src/Model/Tag.php b/src/Model/Tag.php
index 451ed687b..c7155b539 100644
--- a/src/Model/Tag.php
+++ b/src/Model/Tag.php
@@ -518,6 +518,23 @@ class Tag
 		}
 	}
 
+	/**
+	 * Fetch the blocked tags as SQL
+	 *
+	 * @return string 
+	 */
+	private static function getBlockedSQL()
+	{
+		$blocked_txt = DI::config()->get('system', 'blocked_tags');
+		if (empty($blocked_txt)) {
+			return '';
+		}
+
+		$blocked = explode(',', $blocked_txt);
+		array_walk($blocked, function(&$value) { $value = "'" . DBA::escape(trim($value)) . "'";});
+		return " AND NOT `name` IN (" . implode(',', $blocked) . ")";
+	}
+
 	/**
 	 * Creates a list of the most frequent global hashtags over the given period
 	 *
@@ -528,9 +545,11 @@ class Tag
 	 */
 	public static function setGlobalTrendingHashtags(int $period, int $limit = 10)
 	{
+		$block_sql = self::getBlockedSQL();
+
 		$tagsStmt = DBA::p("SELECT `name` AS `term`, COUNT(*) AS `score`
 			FROM `tag-search-view`
-			WHERE `private` = ? AND `uid` = ? AND `received` > DATE_SUB(NOW(), INTERVAL ? HOUR)
+			WHERE `private` = ? AND `uid` = ? AND `received` > DATE_SUB(NOW(), INTERVAL ? HOUR) $block_sql
 			GROUP BY `term` ORDER BY `score` DESC LIMIT ?",
 			Item::PUBLIC, 0, $period, $limit);
 
@@ -571,9 +590,11 @@ class Tag
 	 */
 	public static function setLocalTrendingHashtags(int $period, int $limit = 10)
 	{
+		$block_sql = self::getBlockedSQL();
+
 		$tagsStmt = DBA::p("SELECT `name` AS `term`, COUNT(*) AS `score`
 			FROM `tag-search-view`
-			WHERE `private` = ? AND `wall` AND `origin` AND `received` > DATE_SUB(NOW(), INTERVAL ? HOUR)
+			WHERE `private` = ? AND `wall` AND `origin` AND `received` > DATE_SUB(NOW(), INTERVAL ? HOUR) $block_sql
 			GROUP BY `term` ORDER BY `score` DESC LIMIT ?",
 			Item::PUBLIC, $period, $limit);
 
diff --git a/static/defaults.config.php b/static/defaults.config.php
index 3e05cab2b..7578e3c55 100644
--- a/static/defaults.config.php
+++ b/static/defaults.config.php
@@ -121,6 +121,10 @@ return [
 		// Deny public access to the local user directory.
 		'block_local_dir' => false,
 
+		// blocked_tags (String)
+		// Comma separated list of hash tags that shouldn't be displayed in the trending tags
+		'blocked_tags' => '',
+
 		// community_no_sharer (Boolean)
 		// Don't display sharing accounts on the global community
 		'community_no_sharer' => false,