Issue tokens to initialize VNC connections

virtweb_backend/src/utils/rand_utils.rs

@@ -0,0 +1,12 @@
+use rand::distributions::Alphanumeric;
+use rand::Rng;
+
+/// Generate a random string
+pub fn rand_str(len: usize) -> String {
+    let s: String = rand::thread_rng()
+        .sample_iter(&Alphanumeric)
+        .take(len)
+        .map(char::from)
+        .collect();
+    s
+}