fix(hub): a downloaded file opens in a tab only under a type that runs nothing

Open is offered for PDFs, raster images, audio, video and plain text, typed
from the name; HTML, SVG and the rest are not opened in the hub's origin.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/packages/meshbay-hub/tests/test_transfers.py b/packages/meshbay-hub/tests/test_transfers.py
index 1d0c0f0..c7a9dc5 100644
--- a/packages/meshbay-hub/tests/test_transfers.py
+++ b/packages/meshbay-hub/tests/test_transfers.py
@@ -918,3 +918,23 @@ def test_the_reason_is_translated_everywhere():
     `transfers.not_pausable` in a tooltip rather than a sentence."""
     for path in sorted((STATIC / "locales").glob("*.js")):
         assert "'transfers.not_pausable'" in path.read_text(encoding="utf-8"), path.name
+
+
+def test_open_is_offered_only_when_the_target_says_it_can_be(tmp_path):
+    """A row whose file cannot be opened (a type that could run in the hub's
+    origin, an archive, a stream the page cannot read back) has no Open button,
+    rather than one that does nothing."""
+    result = _run("""
+const store = new TransferStore();
+const done = (openable) => store.start({
+  kind: 'download', name: 'f', total: 1,
+  prepare: async () => (openable === undefined ? {} : { openable }),
+  open: () => {},
+  run: async ({ onProgress }) => { onProgress(1, 1); },
+});
+done(false); done(true); done(undefined);
+await new Promise(r => setTimeout(r, 30));
+say(...store.list().map(it => [it.status, it.canOpen]));
+""", tmp_path)
+    assert sorted(map(tuple, result)) == sorted([
+        ("done", False), ("done", True), ("done", True)])