Accept relay posts based on the selected user languages

src/Model/User.php

@@ -575,6 +575,46 @@ class User
 		return DI::l10n()->toISO6391(DI::config()->get('system', 'language'));
 	}
 
+	/**
+	 * Get a list of all languages that are used by the users
+	 *
+	 * @return array
+	 */
+	public static function getLanguages(): array
+	{
+		$supported = array_keys(DI::l10n()->getLanguageCodes());
+		$languages = [];
+		$uids      = [];
+
+		$users = DBA::select('user', ['uid', 'language'], ["`verified` AND NOT `blocked` AND NOT `account_removed` AND NOT `account_expired` AND `uid` > ?", 0]);
+		while ($user = DBA::fetch($users)) {
+			$uids[] = $user['uid'];
+			$code = DI::l10n()->toISO6391($user['language']);
+			if (!in_array($code, $supported)) {
+				continue;
+			}
+			$languages[$code] = $code;
+		}
+		DBA::close($users);
+
+		$channels = DBA::select('pconfig', ['uid', 'v'], ["`cat` = ? AND `k` = ? AND `v` != ?", 'channel', 'languages', '']);
+		while ($channel = DBA::fetch($channels)) {
+			if (!in_array($channel['uid'], $uids)) {
+				continue;
+			}
+			$values = unserialize($channel['v']);
+			if (!empty($values) && is_array($values)) {
+				foreach ($values as $language) {
+					$language = DI::l10n()->toISO6391($language);
+					$languages[$language] = $language;
+				}
+			}
+		}
+		DBA::close($channels);
+
+		return array_keys($languages);
+	}
+
 	/**
 	 * Authenticate a user with a clear text password
 	 *

src/Protocol/ActivityPub/Processor.php

@@ -1001,7 +1001,7 @@ class Processor
 		}
 
 		$tags = array_column(Tag::getByURIId($item['uri-id'], [Tag::HASHTAG]), 'name');
-		if (Relay::isSolicitedPost($tags, $item['body'], $item['author-id'], $item['uri'], Protocol::ACTIVITYPUB, $activity['thread-completion'] ?? 0)) {
+		if (Relay::isSolicitedPost($tags, $item['title'] . ' ' . ($item['content-warning'] ?? '') . ' ' . $item['body'], $item['author-id'], $item['uri'], Protocol::ACTIVITYPUB, $activity['thread-completion'] ?? 0)) {
 			Logger::debug('Post is accepted because of the relay settings', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
 			return true;
 		} else {

src/Protocol/Relay.php

@@ -23,6 +23,7 @@ namespace Friendica\Protocol;
 
 use Friendica\Content\Smilies;
 use Friendica\Content\Text\BBCode;
+use Friendica\Core\Cache\Enum\Duration;
 use Friendica\Core\Logger;
 use Friendica\Core\Protocol;
 use Friendica\Database\DBA;
@@ -34,6 +35,7 @@ use Friendica\Model\Item;
 use Friendica\Model\Post;
 use Friendica\Model\Search;
 use Friendica\Model\Tag;
+use Friendica\Model\User;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Strings;
 
@@ -185,13 +187,22 @@ class Relay
 			}
 		}
 
-		Logger::debug('Got languages', ['languages' => $languages, 'body' => $body]);
-
 		if (!empty($languages)) {
-			if (in_array($languages[0], DI::config()->get('system', 'relay_deny_languages'))) {
-				Logger::info('Unwanted language found', ['language' => $languages[0]]);
-				return false;
+			$cachekey = 'relay:isWantedLanguage';
+			$user_languages = DI::cache()->get($cachekey);
+			if (is_null($user_languages)) {
+				$user_languages = User::getLanguages();
+				DI::cache()->set($cachekey, $user_languages, Duration::HALF_HOUR);
 			}
+
+			foreach ($languages as $language) {
+				if (in_array($language, $user_languages)) {
+					Logger::debug('Wanted language found', ['language' => $language, 'languages' => $languages, 'userlang' => $user_languages, 'body' => $body]);
+					return true;
+				}
+			}
+			Logger::debug('No wanted language found', ['languages' => $languages, 'userlang' => $user_languages, 'body' => $body]);
+			return false;
 		} elseif (DI::config()->get('system', 'relay_deny_undetected_language')) {
 			Logger::info('Undetected language found', ['body' => $body]);
 			return false;

static/defaults.config.php

@@ -558,10 +558,6 @@ return [
 		// Redistribute incoming activities via ActivityPub
 		'redistribute_activities' => true,
 
-		// relay_deny_languages (Array)
-		// Array of languages (two digit format) that are rejected.
-		'relay_deny_languages' => [],
-
 		// relay_deny_undetected_language (Boolean)
 		// Deny undetected languages
 		'relay_deny_undetected_language' => false,