From ea7afecf28e34b4d1006dc2340630a9f3ea6a9f7 Mon Sep 17 00:00:00 2001
From: Joel <joel.garplind@gmail.com>
Date: Mon, 8 Jul 2024 00:27:30 +0200
Subject: Fix misplaced '@' in RTL post meta. (#4531)

Co-authored-by: Joel <joel.garplind+github@gmail.com>
Co-authored-by: Hailey <me@haileyok.com>
---
 src/lib/strings/bidi.ts    | 10 ++++++++++
 src/lib/strings/handles.ts |  6 +++++-
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 src/lib/strings/bidi.ts

(limited to 'src/lib/strings')

diff --git a/src/lib/strings/bidi.ts b/src/lib/strings/bidi.ts
new file mode 100644
index 000000000..790c2b6ac
--- /dev/null
+++ b/src/lib/strings/bidi.ts
@@ -0,0 +1,10 @@
+const LEFT_TO_RIGHT_EMBEDDING = '\u202A'
+const POP_DIRECTIONAL_FORMATTING = '\u202C'
+
+/*
+ * Force LTR directionality in a string.
+ * https://www.unicode.org/reports/tr9/#Directional_Formatting_Characters
+ */
+export function forceLTR(str: string) {
+  return LEFT_TO_RIGHT_EMBEDDING + str + POP_DIRECTIONAL_FORMATTING
+}
diff --git a/src/lib/strings/handles.ts b/src/lib/strings/handles.ts
index bc07b32ec..7955e1b2e 100644
--- a/src/lib/strings/handles.ts
+++ b/src/lib/strings/handles.ts
@@ -1,5 +1,7 @@
 // Regex from the go implementation
 // https://github.com/bluesky-social/indigo/blob/main/atproto/syntax/handle.go#L10
+import {forceLTR} from 'lib/strings/bidi'
+
 const VALIDATE_REGEX =
   /^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?$/
 
@@ -22,7 +24,9 @@ export function isInvalidHandle(handle: string): boolean {
 }
 
 export function sanitizeHandle(handle: string, prefix = ''): string {
-  return isInvalidHandle(handle) ? '⚠Invalid Handle' : `${prefix}${handle}`
+  return isInvalidHandle(handle)
+    ? '⚠Invalid Handle'
+    : forceLTR(`${prefix}${handle}`)
 }
 
 export interface IsValidHandle {
-- 
cgit 1.4.1