From 22de74430fc3aa83a82c34bc3cfc8753701db995 Mon Sep 17 00:00:00 2001
From: emeric <emeric.poupon@laposte.net>
Date: Sun, 22 Feb 2026 22:19:46 +0100
Subject: [PATCH] Added OS field 'readonly' in playlist responses

---
 SUBSONIC.md                                   |  2 ++
 src/libs/subsonic/impl/responses/Playlist.cpp | 12 ++++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/SUBSONIC.md b/SUBSONIC.md
index 3b8a2a0c..9c106e7e 100644
--- a/SUBSONIC.md
+++ b/SUBSONIC.md
@@ -61,6 +61,8 @@ The following extra fields are implemented:
   * `musicBrainzId`
   * `sortName`
   * `roles`
+* `Playlist` response:
+  * `readonly`
 
 ## Supported extensions
 * [API Key Authentication](https://opensubsonic.netlify.app/docs/extensions/apikeyauth/)
diff --git a/src/libs/subsonic/impl/responses/Playlist.cpp b/src/libs/subsonic/impl/responses/Playlist.cpp
index 2ba03013..9e4c6871 100644
--- a/src/libs/subsonic/impl/responses/Playlist.cpp
+++ b/src/libs/subsonic/impl/responses/Playlist.cpp
@@ -43,8 +43,10 @@ namespace lms::api::subsonic
         playlistNode.setAttribute("public", tracklist->getVisibility() == db::TrackList::Visibility::Public);
         playlistNode.setAttribute("changed", core::stringUtils::toISO8601String(tracklist->getLastModifiedDateTime()));
         playlistNode.setAttribute("created", core::stringUtils::toISO8601String(tracklist->getCreationDateTime()));
-        if (const db::User::pointer user{ tracklist->getUser() })
-            playlistNode.setAttribute("owner", user->getLoginName());
+
+        const db::User::pointer trackListUser{ tracklist->getUser() };
+        if (trackListUser)
+            playlistNode.setAttribute("owner", trackListUser->getLoginName());
 
         if (const db::ArtworkId artworkId{ core::Service<artwork::IArtworkService>::get()->findTrackListImage(tracklist->getId()) }; artworkId.isValid())
         {
@@ -55,6 +57,12 @@ namespace lms::api::subsonic
             }
         }
 
+        if (context.isOpenSubsonicEnabled())
+        {
+            // A playlist with no owner is always read only, and only the owner of a tracklist can modify it
+            playlistNode.setAttribute("readonly", !trackListUser || trackListUser != context.getUser());
+        }
+
         return playlistNode;
     }
 } // namespace lms::api::subsonic
\ No newline at end of file