From 799ab94af313f635dbe4547ea2f9a85c3124fd11 Mon Sep 17 00:00:00 2001
From: Dessalines <tyhou13@gmx.com>
Date: Thu, 1 Apr 2021 14:09:53 -0400
Subject: [PATCH] Don't allow zero-space char in display name. Fixes #1317

---
 crates/utils/src/test.rs  | 6 ++++++
 crates/utils/src/utils.rs | 5 ++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/crates/utils/src/test.rs b/crates/utils/src/test.rs
index 04abd4b7d..754aa8c3a 100644
--- a/crates/utils/src/test.rs
+++ b/crates/utils/src/test.rs
@@ -32,6 +32,12 @@ fn test_valid_register_username() {
 fn test_valid_display_name() {
   assert!(is_valid_display_name("hello @there"));
   assert!(!is_valid_display_name("@hello there"));
+
+  // Make sure zero-space with an @ doesn't work
+  assert!(!is_valid_display_name(&format!(
+    "{}@my name is",
+    '\u{200b}'
+  )));
 }
 
 #[test]
diff --git a/crates/utils/src/utils.rs b/crates/utils/src/utils.rs
index 931565b6d..732ac2c8d 100644
--- a/crates/utils/src/utils.rs
+++ b/crates/utils/src/utils.rs
@@ -109,7 +109,10 @@ pub fn is_valid_username(name: &str) -> bool {
 
 // Can't do a regex here, reverse lookarounds not supported
 pub fn is_valid_display_name(name: &str) -> bool {
-  !name.starts_with('@') && name.chars().count() >= 3 && name.chars().count() <= 20
+  !name.starts_with('@')
+    && !name.starts_with('\u{200b}')
+    && name.chars().count() >= 3
+    && name.chars().count() <= 20
 }
 
 pub fn is_valid_community_name(name: &str) -> bool {