Use the post language for the language detection / config for quality

src/Model/Item.php

@@ -117,7 +117,7 @@ class Item
 	const DELIVER_FIELDLIST = [
 		'uid', 'id', 'parent', 'uri-id', 'uri', 'thr-parent', 'parent-uri', 'guid',
 		'parent-guid', 'conversation', 'received', 'created', 'edited', 'verb', 'object-type', 'object', 'target',
-		'private', 'title', 'body', 'raw-body', 'location', 'coord', 'app',
+		'private', 'title', 'body', 'raw-body', 'language', 'location', 'coord', 'app',
 		'inform', 'deleted', 'extid', 'post-type', 'post-reason', 'gravity',
 		'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 		'author-id', 'author-addr', 'author-link', 'author-name', 'author-avatar', 'owner-id', 'owner-link', 'contact-uid',
@@ -1484,6 +1484,10 @@ class Item
 	 */
 	private static function setOwnerforResharedItem(array $item)
 	{
+		if ($item['uid'] == 0) {
+			return;
+		}
+
 		$parent = Post::selectFirst(
 			['id', 'causer-id', 'owner-id', 'author-id', 'author-link', 'origin', 'post-reason'],
 			['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]

src/Protocol/ActivityPub/Processor.php

@@ -1673,7 +1673,39 @@ class Processor
 			}
 		}
 
-		return Relay::isSolicitedPost($messageTags, $content, $authorid, $id, Protocol::ACTIVITYPUB, $activity['thread-completion'] ?? 0);
+		$languages = self::getPostLanguages($activity);
+
+		return Relay::isSolicitedPost($messageTags, $content, $authorid, $id, Protocol::ACTIVITYPUB, $activity['thread-completion'] ?? 0, $languages);
+	}
+
+	/**
+	 * Fetch the post language from the content
+	 *
+	 * @param array $activity
+	 * @return array
+	 */
+	private static function getPostLanguages(array $activity): array
+	{
+		$content   = JsonLD::fetchElement($activity['as:object'], 'as:content') ?? '';
+		$languages = JsonLD::fetchElementArray($activity['as:object'], 'as:content', '@language') ?? [];
+		if (empty($languages)) {
+			return [];
+		}
+
+		$iso639 = new \Matriphe\ISO639\ISO639;
+
+		$result = [];
+		foreach ($languages as $language) {
+			if ($language == $content) {
+				continue;
+  			}
+			$language = DI::l10n()->toISO6391($language);
+			if (!in_array($language, array_column($iso639->allLanguages(), 0))) {
+				continue;
+			}
+			$result[] = $language;
+		}
+		return $result;
 	}
 
 	/**

src/Protocol/ActivityPub/Transmitter.php

@@ -895,6 +895,19 @@ class Transmitter
 	 */
 	public static function getReceiversForUriId(int $uri_id, bool $blindcopy)
 	{
+		$tags = Tag::getByURIId($uri_id, [Tag::TO, Tag::CC, Tag::BCC, Tag::AUDIENCE]);
+		if (empty($tags)) {
+			Logger::debug('No receivers found', ['uri-id' => $uri_id]);
+			$post = Post::selectFirst([Item::DELIVER_FIELDLIST], ['uri-id' => $uri_id, 'origin' => true]);
+			if (!empty($post)) {
+				ActivityPub\Transmitter::storeReceiversForItem($post);
+				$tags = Tag::getByURIId($uri_id, [Tag::TO, Tag::CC, Tag::BCC, Tag::AUDIENCE]);
+				Logger::debug('Receivers are created', ['uri-id' => $uri_id, 'receivers' => count($tags)]);
+			} else {
+				Logger::debug('Origin item not found', ['uri-id' => $uri_id]);
+			}
+		}
+
 		$receivers = [
 			'to'       => [],
 			'cc'       => [],
@@ -902,7 +915,7 @@ class Transmitter
 			'audience' => [],
 		];
 
-		foreach (Tag::getByURIId($uri_id, [Tag::TO, Tag::CC, Tag::BCC, Tag::AUDIENCE]) as $receiver) {
+		foreach ($tags as $receiver) {
 			switch ($receiver['type']) {
 				case Tag::TO:
 					$receivers['to'][] = $receiver['url'];
@@ -1884,7 +1897,7 @@ class Transmitter
 		if (!empty($item['language'])) {
 			$languages = array_keys(json_decode($item['language'], true));
 			if (!empty($languages[0])) {
-				return $languages[0];
+				return DI::l10n()->toISO6391($languages[0]);
 			}
 		}
 
@@ -1892,12 +1905,12 @@ class Transmitter
 		if (!empty($item['uid'])) {
 			$user = DBA::selectFirst('user', ['language'], ['uid' => $item['uid']]);
 			if (!empty($user['language'])) {
-				return $user['language'];
+				return DI::l10n()->toISO6391($user['language']);
 			}
 		}
 
 		// And finally just use the system language
-		return DI::config()->get('system', 'language');
+		return DI::l10n()->toISO6391(DI::config()->get('system', 'language'));
 	}
 
 	/**

src/Protocol/Relay.php

@@ -53,13 +53,16 @@ class Relay
 	/**
 	 * Check if a post is wanted
 	 *
-	 * @param array $tags
+	 * @param array  $tags
 	 * @param string $body
-	 * @param int $authorid
+	 * @param int    $authorid
 	 * @param string $url
+	 * @param string $network
+	 * @param int    $causerid
+	 * @param array  $languages
 	 * @return boolean "true" is the post is wanted by the system
 	 */
-	public static function isSolicitedPost(array $tags, string $body, int $authorid, string $url, string $network = '', int $causerid = 0): bool
+	public static function isSolicitedPost(array $tags, string $body, int $authorid, string $url, string $network = '', int $causerid = 0, array $languages = []): bool
 	{
 		$config = DI::config();
 
@@ -128,7 +131,7 @@ class Relay
 			}
 		}
 
-		if (!self::isWantedLanguage($body, 0, $authorid)) {
+		if (!self::isWantedLanguage($body, 0, $authorid, $languages)) {
 			Logger::info('Unwanted or Undetected language found - rejected', ['network' => $network, 'url' => $url, 'causer' => $causer, 'tags' => $tags]);
 			return false;
 		}
@@ -171,37 +174,45 @@ class Relay
 	 * @param string $body
 	 * @param int    $uri_id
 	 * @param int    $author_id
+	 * @param array  $languages
 	 * @return boolean
 	 */
-	public static function isWantedLanguage(string $body, int $uri_id = 0, int $author_id = 0)
+	public static function isWantedLanguage(string $body, int $uri_id = 0, int $author_id = 0, array $languages = [])
 	{
-		if (empty($body) || Smilies::isEmojiPost($body)) {
+		if (empty($languages) && (empty($body) || Smilies::isEmojiPost($body))) {
 			Logger::debug('Empty body or only emojis', ['body' => $body]);
 			return true;
 		}
 
-		$languages = [];
+		$detected = [];
+		$quality  = DI::config()->get('system', 'relay_language_quality');
 		foreach (Item::getLanguageArray($body, 10, $uri_id, $author_id) as $language => $reliability) {
-			if ($reliability > 0) {
+			if (($reliability >= $quality) && ($quality > 0)) {
-				$languages[] = $language;
+				$detected[] = $language;
 			}
 		}
 
-		if (!empty($languages)) {
+		if (!empty($languages) || !empty($detected)) {
 			$cachekey = 'relay:isWantedLanguage';
 			$user_languages = DI::cache()->get($cachekey);
 			if (is_null($user_languages)) {
 				$user_languages = User::getLanguages();
-				DI::cache()->set($cachekey, $user_languages, Duration::HALF_HOUR);
+				DI::cache()->set($cachekey, $user_languages);
 			}
 
-			foreach ($languages as $language) {
+			foreach ($detected as $language) {
 				if (in_array($language, $user_languages)) {
-					Logger::debug('Wanted language found', ['language' => $language, 'languages' => $languages, 'userlang' => $user_languages, 'body' => $body]);
+					Logger::debug('Wanted language found in detected languages', ['language' => $language, 'detected' => $detected, 'userlang' => $user_languages, 'body' => $body]);
 					return true;
 				}
 			}
-			Logger::debug('No wanted language found', ['languages' => $languages, 'userlang' => $user_languages, 'body' => $body]);
+			foreach ($languages as $language) {
+				if (in_array($language, $user_languages)) {
+					Logger::debug('Wanted language found in defined languages', ['language' => $language, 'languages' => $languages, 'detected' => $detected, 'userlang' => $user_languages, 'body' => $body]);
+					return true;
+				}
+			}
+			Logger::debug('No wanted language found', ['languages' => $languages, 'detected' => $detected, 'userlang' => $user_languages, 'body' => $body]);
 			return false;
 		} elseif (DI::config()->get('system', 'relay_deny_undetected_language')) {
 			Logger::info('Undetected language found', ['body' => $body]);

static/defaults.config.php

@@ -562,6 +562,10 @@ return [
 		// Deny undetected languages
 		'relay_deny_undetected_language' => false,
 
+		// relay_language_quality (Integer)
+		// Minimum value for the language detection quality for relay posts. The value must be betweeen 0 and 1.
+		'relay_language_quality' => 0,
+
 		// session_handler (database|cache|native)
 		// Whether to use Cache to store session data or to use PHP native session storage.
 		'session_handler' => 'database',