add previews in binary content

features/content/server/src/jvmMain/kotlin/dev/inmo/postssystem/features/content/server/ServerContentStorageAggregator.kt

@@ -115,4 +115,25 @@ class ServerContentStorageAggregator(
 
         return currentResults.createPaginationResult(pagination, count())
     }
+
+    override suspend fun getContentPreview(id: ContentId): RegisteredContent? {
+        val result = CompletableDeferred<RegisteredContent>()
+
+        storages.map {
+            scope.launch {
+                val content = it.getContentPreview(id)
+                if (content != null) {
+                    result.complete(content)
+                }
+            }.also { job ->
+                result.invokeOnCompletion { job.cancel() }
+            }
+        }.joinAll()
+
+        return if (result.isCompleted) {
+            result.getCompleted()
+        } else {
+            return null
+        }
+    }
 }