From 36a1de7f659da0416058f86ba1828506e78c2716 Mon Sep 17 00:00:00 2001
From: Divy Srivastava <dj.srivastava23@gmail.com>
Date: Wed, 30 Nov 2022 17:19:52 +0530
Subject: [PATCH] Optional key in `v8::ArrayBuffer:detach`

---
 src/array_buffer.rs |  6 ++++--
 tests/test_api.rs   | 17 ++++++++---------
 2 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/src/array_buffer.rs b/src/array_buffer.rs
index b77f4642ec..52ed9c2fca 100644
--- a/src/array_buffer.rs
+++ b/src/array_buffer.rs
@@ -4,6 +4,7 @@ use std::cell::Cell;
 use std::ffi::c_void;
 use std::ops::Deref;
 use std::ptr;
+use std::ptr::null;
 use std::ptr::null_mut;
 use std::ptr::NonNull;
 use std::slice;
@@ -412,11 +413,12 @@ impl ArrayBuffer {
   /// `None` if the key didn't pass the `[[ArrayBufferDetachKey]]` check,
   /// and `Some(true)` otherwise.
   #[inline(always)]
-  pub fn detach(&self, key: Local<Value>) -> Option<bool> {
+  pub fn detach(&self, key: Option<Local<Value>>) -> Option<bool> {
     // V8 terminates when the ArrayBuffer is not detachable. Non-detachable
     // buffers are buffers that are in use by WebAssembly or asm.js.
     if self.is_detachable() {
-      unsafe { v8__ArrayBuffer__Detach(self, &*key) }.into()
+      let key = key.map(|v| &*v as *const Value).unwrap_or(null());
+      unsafe { v8__ArrayBuffer__Detach(self, key) }.into()
     } else {
       Some(true)
     }
diff --git a/tests/test_api.rs b/tests/test_api.rs
index 1b281e265e..3730fdb878 100644
--- a/tests/test_api.rs
+++ b/tests/test_api.rs
@@ -576,16 +576,15 @@ fn array_buffer() {
     assert!(!ab.was_detached());
     assert!(ab.is_detachable());
 
-    let key = v8::undefined(scope);
-    assert!(ab.detach(key.into()).unwrap());
+    assert!(ab.detach(None).unwrap());
     assert_eq!(0, ab.byte_length());
     assert!(ab.was_detached());
-    assert!(ab.detach(key.into()).unwrap()); // Calling it twice should be a no-op.
+    assert!(ab.detach(None).unwrap()); // Calling it twice should be a no-op.
 
     // detecting if it was detached on a zero-length ArrayBuffer should work
     let empty_ab = v8::ArrayBuffer::new(scope, 0);
     assert!(!empty_ab.was_detached());
-    assert!(empty_ab.detach(key.into()).unwrap());
+    assert!(empty_ab.detach(None).unwrap());
     assert!(empty_ab.was_detached());
 
     let bs = v8::ArrayBuffer::new_backing_store(scope, 84);
@@ -8572,9 +8571,9 @@ fn test_detach_key() {
     let buffer = v8::ArrayBuffer::new(scope, 1024);
     buffer.set_detach_key(detach_key);
     assert!(buffer.is_detachable());
-    assert_eq!(buffer.detach(v8::undefined(scope).into()), None);
+    assert_eq!(buffer.detach(None), None);
     assert!(!buffer.was_detached());
-    assert_eq!(buffer.detach(detach_key), Some(true));
+    assert_eq!(buffer.detach(Some(detach_key)), Some(true));
     assert!(buffer.was_detached());
   }
 
@@ -8588,9 +8587,9 @@ fn test_detach_key() {
     let buffer = v8::ArrayBuffer::new(scope, 1024);
     buffer.set_detach_key(v8_detach_key.into());
     assert!(buffer.is_detachable());
-    assert_eq!(buffer.detach(v8::undefined(scope).into()), None);
+    assert_eq!(buffer.detach(None), None);
     assert!(!buffer.was_detached());
-    assert_eq!(buffer.detach(v8_detach_key.into()), Some(true));
+    assert_eq!(buffer.detach(Some(v8_detach_key.into())), Some(true));
     assert!(buffer.was_detached());
   }
 
@@ -8599,7 +8598,7 @@ fn test_detach_key() {
     let buffer = v8::ArrayBuffer::new(scope, 1024);
     buffer.set_detach_key(v8::undefined(scope).into());
     assert!(buffer.is_detachable());
-    assert_eq!(buffer.detach(v8::undefined(scope).into()), Some(true));
+    assert_eq!(buffer.detach(Some(v8::undefined(scope).into())), Some(true));
     assert!(buffer.was_detached());
   }
 }