Support files inside shared folders

lib/Controller/findMementos.php

@@ -92,9 +92,14 @@ function findPublicMementos($shareManager, $userId) {
 		-1 /* no limit */
 	);
 
-	$urlForShare = function ($share) {
+	$urlForSharedFile = function ($share) {
 		return "/apps/raw/s/" . $share->getToken(); // XXX hardcoded dependency
 	};
+	$urlForFileInsideSharedFolder = function ($share, $folder, $file) {
+		$absoluteFilePath = $file->getPath();
+		$relativeFilePath = $folder->getRelativePath($absoluteFilePath);
+		return joinPaths("/apps/raw/s/{$share->getToken()}", $relativeFilePath);
+	};
 
 	// Look into every shared file to see if it is a memento.
 	$foundMementos = [];
@@ -103,11 +108,20 @@ function findPublicMementos($shareManager, $userId) {
 		if ($node->getType() === FileInfo::TYPE_FILE) {
 			$mementoInfo = extractMementoInfo($node);
 			if ($mementoInfo) {
-				$mementoInfo['mementoUrl'] = $urlForShare($share);
+				$mementoInfo['mementoUrl'] = $urlForSharedFile($share);
 				$foundMementos[] = $mementoInfo;
 			}
 		} else {
-			// TODO add files inside shared folders? How to make URLs for those?
+			// Share is a folder: Go through all html files inside the shared folder.
+			$folder = $node;
+			$files = $folder->searchByMime('text/html');
+			foreach ($files as $file) {
+				$mementoInfo = extractMementoInfo($file);
+				if ($mementoInfo) {
+					$mementoInfo['mementoUrl'] = $urlForFileInsideSharedFolder($share, $folder, $file);
+					$foundMementos[] = $mementoInfo;
+				}
+			}
 		}
 	}
 	return $foundMementos;