Generate ActivityPub content warnings from [spoiler] elements

src/Content/Text/BBCode.php

@@ -2180,6 +2180,30 @@ class BBCode
 		return $abstract;
 	}
 	
+	/**
+	 * Returns a list of the headings of "spoiler" elements
+	 * 
+	 * @param string $text The text containing spoiler elements
+	 * @return array The list of spoiler headings
+	 */
+	public static function getSpoilerHeadings(string $text): array
+	{
+		DI::profiler()->startRecording('rendering');
+		
+		$headings = BBCode::performWithEscapedTags($text, ['code', 'noparse', 'nobb', 'pre'], function ($text) {
+			$headings = [];
+			if (preg_match_all('/\[spoiler=[\"\']*(.*?)[\"\']*\]/ism', $text, $matches)) {
+				foreach ($matches[1] as $item) {
+					$headings[] = BBCode::toPlaintext($item);
+				}
+			}
+			return $headings;
+		});
+		
+		DI::profiler()->stopRecording();
+		return $headings;
+	}
+
 	/**
 	 * Callback function to replace a Friendica style mention in a mention for Diaspora
 	 *

src/Protocol/ActivityPub.php

@@ -76,6 +76,7 @@ class ActivityPub
 		'discoverable' => 'toot:discoverable',
 		'PropertyValue' => 'schema:PropertyValue',
 		'value' => 'schema:value',
+		'keithext' => 'http://bytes.keithhacks.cyou/keith/friendica/',
 	]];
 	const ACCOUNT_TYPES = ['Person', 'Organization', 'Service', 'Group', 'Application', 'Tombstone'];
 	/**

src/Protocol/ActivityPub/Receiver.php

@@ -1835,6 +1835,12 @@ class Receiver
 		$object_data['sensitive'] = JsonLD::fetchElement($object, 'as:sensitive');
 		$object_data['name'] = JsonLD::fetchElement($object, 'as:name', '@value');
 		$object_data['summary'] = JsonLD::fetchElement($object, 'as:summary', '@value');
+		// HACK Don't know exactly where I should be checking keithext:summaryFromSpoilers to prevent
+		//  auto-generated spoiler CWs from showing up on Friendica, but it's definitely not here.
+		//  However, this should work for now.
+		// TODO @keith clean this up or else
+		if (JsonLD::fetchElement($object, 'keithext:summaryFromSpoilers', '@value'))
+			$object_data['summary'] = null;
 		$object_data['content'] = JsonLD::fetchElement($object, 'as:content', '@value');
 		$object_data['mediatype'] = JsonLD::fetchElement($object, 'as:mediaType', '@value');
 		$object_data = self::getSource($object, $object_data);

src/Protocol/ActivityPub/Transmitter.php

@@ -1599,7 +1599,16 @@ class Transmitter
 			return $data;
 		}
 
-		$data['summary'] = BBCode::toPlaintext(BBCode::getAbstract($item['body'], Protocol::ACTIVITYPUB));
+		$abstract = BBCode::getAbstract($item['body'], Protocol::ACTIVITYPUB);
+		if (!empty($abstract)) {
+			$data['summary'] = BBCode::toPlaintext($abstract);
+		} else {
+			$warnings = BBCode::getSpoilerHeadings($item['body']);
+			if ($warnings) {
+				$data['summary'] = implode(', ', $warnings);
+				$data['keithext:summaryFromSpoilers'] = true;
+			}
+		}
 
 		if ($item['uri'] != $item['thr-parent']) {
 			$data['inReplyTo'] = $item['thr-parent'];

src/Protocol/DFRN.php

@@ -780,7 +780,7 @@ class DFRN
 		}
 
 		// Remove the abstract element. It is only locally important.
-		$body = BBCode::stripAbstract($body);
+		// $body = BBCode::stripAbstract($body);
 
 		$htmlbody = '';
 		if ($type == 'html') {