Add missing file

examples/federation/utils.rs

@@ -0,0 +1,13 @@
+use rand::{distributions::Alphanumeric, thread_rng, Rng};
+use url::{ParseError, Url};
+
+/// Just generate random url as object id. In a real project, you probably want to use
+/// an url which contains the database id for easy retrieval (or store the random id in db).
+pub fn generate_object_id(hostname: &str) -> Result<Url, ParseError> {
+    let id: String = thread_rng()
+        .sample_iter(&Alphanumeric)
+        .take(7)
+        .map(char::from)
+        .collect();
+    Url::parse(&format!("http://{}/objects/{}", hostname, id))
+}