bskyweb: add isPartOf jsonld post attr (#10945)

bskyweb/cmd/bskyweb/labels.go

@@ -20,3 +20,20 @@ func profileRequiresAuth(pv *appbsky.ActorDefs_ProfileViewDetailed) bool {
 	}
 	return false
 }
+
+// postAuthorRequiresAuth reports whether the post author self-applied the
+// !no-unauthenticated label, read from the author view embedded in a
+// getPostThread response. The appview surfaces the account's profile-record
+// self-labels on the post author (src == author DID), so this mirrors
+// profileRequiresAuth without a separate ActorGetProfile call.
+func postAuthorRequiresAuth(pv *appbsky.FeedDefs_PostView) bool {
+	if pv == nil || pv.Author == nil {
+		return false
+	}
+	for _, label := range pv.Author.Labels {
+		if label.Src == pv.Author.Did && label.Val == "!no-unauthenticated" {
+			return true
+		}
+	}
+	return false
+}