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+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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+From: Michael Dawson <[email protected]>
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+Date: Tue, 25 Oct 2022 17:39:41 -0400
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+Subject: node-api: handle no support for external buffers
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+
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+Refs: https://github.com/electron/electron/issues/35801
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+Refs: https://github.com/nodejs/abi-stable-node/issues/441
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+
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+Electron recently dropped support for external
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+buffers. Provide a way for addon authors to:
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+- hide the methods to create external buffers so they can
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+ avoid using them if they want the broadest compatibility.
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+- call the methods that create external buffers at runtime
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+ to check if external buffers are supported and either
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+ use them or not based on the return code.
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+
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+Signed-off-by: Michael Dawson <[email protected]>
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+
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+PR-URL: https://github.com/nodejs/node/pull/45181
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+Reviewed-By: Chengzhong Wu <[email protected]>
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+Reviewed-By: Minwoo Jung <[email protected]>
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+
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+diff --git a/doc/api/n-api.md b/doc/api/n-api.md
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+index 3d1741bad82359af6a258fb2a059656f1528bba0..d64f80e2635074df7f8ecd72d1fde7d1747786fa 100644
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+--- a/doc/api/n-api.md
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++++ b/doc/api/n-api.md
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+@@ -579,6 +579,7 @@ typedef enum {
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+ napi_arraybuffer_expected,
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+ napi_detachable_arraybuffer_expected,
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+ napi_would_deadlock, /* unused */
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++ napi_no_external_buffers_allowed
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+ } napi_status;
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+ ```
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+
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+@@ -2394,6 +2395,19 @@ napi_create_external_arraybuffer(napi_env env,
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+
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+ Returns `napi_ok` if the API succeeded.
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+
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++**Some runtimes other than Node.js have dropped support for external buffers**.
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++On runtimes other than Node.js this method may return
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++`napi_no_external_buffers_allowed` to indicate that external
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++buffers are not supported. One such runtime is Electron as
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++described in this issue
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++[electron/issues/35801](https://github.com/electron/electron/issues/35801).
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++
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++In order to maintain broadest compatibility with all runtimes
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++you may define `NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED` in your addon before
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++includes for the node-api headers. Doing so will hide the 2 functions
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++that create external buffers. This will ensure a compilation error
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++occurs if you accidentally use one of these methods.
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++
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+ This API returns a Node-API value corresponding to a JavaScript `ArrayBuffer`.
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+ The underlying byte buffer of the `ArrayBuffer` is externally allocated and
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+ managed. The caller must ensure that the byte buffer remains valid until the
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+@@ -2438,6 +2452,19 @@ napi_status napi_create_external_buffer(napi_env env,
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+
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+ Returns `napi_ok` if the API succeeded.
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+
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++**Some runtimes other than Node.js have dropped support for external buffers**.
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++On runtimes other than Node.js this method may return
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++`napi_no_external_buffers_allowed` to indicate that external
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++buffers are not supported. One such runtime is Electron as
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++described in this issue
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++[electron/issues/35801](https://github.com/electron/electron/issues/35801).
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++
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++In order to maintain broadest compatibility with all runtimes
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++you may define `NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED` in your addon before
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++includes for the node-api headers. Doing so will hide the 2 functions
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++that create external buffers. This will ensure a compilation error
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++occurs if you accidentally use one of these methods.
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++
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+ This API allocates a `node::Buffer` object and initializes it with data
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+ backed by the passed in buffer. While this is still a fully-supported data
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+ structure, in most cases using a `TypedArray` will suffice.
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+diff --git a/src/js_native_api.h b/src/js_native_api.h
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+index 50ccf11e2405802f1c48764067b4010e8b9a0815..2ddf3780e8bde8df59b202c0913cf6434a6581ce 100644
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+--- a/src/js_native_api.h
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++++ b/src/js_native_api.h
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+@@ -404,6 +404,7 @@ NAPI_EXTERN napi_status napi_create_arraybuffer(napi_env env,
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+ size_t byte_length,
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+ void** data,
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+ napi_value* result);
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++#ifndef NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED
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+ NAPI_EXTERN napi_status
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+ napi_create_external_arraybuffer(napi_env env,
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+ void* external_data,
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+@@ -411,6 +412,7 @@ napi_create_external_arraybuffer(napi_env env,
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+ napi_finalize finalize_cb,
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+ void* finalize_hint,
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+ napi_value* result);
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++#endif // NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED
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+ NAPI_EXTERN napi_status napi_get_arraybuffer_info(napi_env env,
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+ napi_value arraybuffer,
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+ void** data,
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+diff --git a/src/js_native_api_types.h b/src/js_native_api_types.h
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+index 6aba06629b31543c13698dbb02b82db309587c4a..7529b853655a25dd6f945df77c9dd024a0403b26 100644
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+--- a/src/js_native_api_types.h
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++++ b/src/js_native_api_types.h
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+@@ -92,7 +92,8 @@ typedef enum {
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+ napi_date_expected,
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+ napi_arraybuffer_expected,
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+ napi_detachable_arraybuffer_expected,
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+- napi_would_deadlock // unused
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++ napi_would_deadlock, // unused
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++ napi_no_external_buffers_allowed
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+ } napi_status;
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+ // Note: when adding a new enum value to `napi_status`, please also update
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+ // * `const int last_status` in the definition of `napi_get_last_error_info()'
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+diff --git a/src/js_native_api_v8.cc b/src/js_native_api_v8.cc
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+index 1c29c43836a0c35a832e494f8eaebbbe1eee8ea4..108ba4bedbd1684b9a69834ae12347faf4670a27 100644
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+--- a/src/js_native_api_v8.cc
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++++ b/src/js_native_api_v8.cc
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+@@ -721,29 +721,30 @@ void Reference::SecondPassCallback(
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+ } // end of namespace v8impl
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+
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+ // Warning: Keep in-sync with napi_status enum
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+-static
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+-const char* error_messages[] = {nullptr,
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+- "Invalid argument",
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+- "An object was expected",
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+- "A string was expected",
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+- "A string or symbol was expected",
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+- "A function was expected",
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+- "A number was expected",
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+- "A boolean was expected",
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+- "An array was expected",
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+- "Unknown failure",
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+- "An exception is pending",
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+- "The async work item was cancelled",
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+- "napi_escape_handle already called on scope",
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+- "Invalid handle scope usage",
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+- "Invalid callback scope usage",
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+- "Thread-safe function queue is full",
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+- "Thread-safe function handle is closing",
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+- "A bigint was expected",
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+- "A date was expected",
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+- "An arraybuffer was expected",
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+- "A detachable arraybuffer was expected",
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+- "Main thread would deadlock",
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++static const char* error_messages[] = {
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++ nullptr,
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++ "Invalid argument",
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++ "An object was expected",
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++ "A string was expected",
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++ "A string or symbol was expected",
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++ "A function was expected",
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++ "A number was expected",
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++ "A boolean was expected",
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++ "An array was expected",
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++ "Unknown failure",
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++ "An exception is pending",
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++ "The async work item was cancelled",
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++ "napi_escape_handle already called on scope",
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++ "Invalid handle scope usage",
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++ "Invalid callback scope usage",
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++ "Thread-safe function queue is full",
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++ "Thread-safe function handle is closing",
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++ "A bigint was expected",
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++ "A date was expected",
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++ "An arraybuffer was expected",
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++ "A detachable arraybuffer was expected",
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++ "Main thread would deadlock",
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++ "External buffers are not allowed",
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+ };
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+
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+ napi_status napi_get_last_error_info(napi_env env,
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+@@ -755,7 +756,7 @@ napi_status napi_get_last_error_info(napi_env env,
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+ // message in the `napi_status` enum each time a new error message is added.
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+ // We don't have a napi_status_last as this would result in an ABI
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+ // change each time a message was added.
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+- const int last_status = napi_would_deadlock;
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++ const int last_status = napi_no_external_buffers_allowed;
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+
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+ static_assert(
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+ NAPI_ARRAYSIZE(error_messages) == last_status + 1,
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+diff --git a/src/node_api.cc b/src/node_api.cc
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+index 60fbe96b8ef272768736ce029bac3ff72f3c84a5..6f8575bb8f289aab041bc126b2fd5f53b1116af5 100644
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+--- a/src/node_api.cc
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++++ b/src/node_api.cc
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+@@ -929,6 +929,10 @@ napi_status napi_create_external_buffer(napi_env env,
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+ NAPI_PREAMBLE(env);
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+ CHECK_ARG(env, result);
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+
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++#if defined(V8_ENABLE_SANDBOX)
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++ return napi_set_last_error(env, napi_no_external_buffers_allowed);
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++#endif
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++
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+ v8::Isolate* isolate = env->isolate;
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+
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+ // The finalizer object will delete itself after invoking the callback.
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+diff --git a/src/node_api.h b/src/node_api.h
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+index 1772c67c15afb2d2712b1900a584f627852e3d7e..47703198fed09a61c3e9e06fa5781d340cc39cf9 100644
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+--- a/src/node_api.h
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++++ b/src/node_api.h
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+@@ -138,12 +138,14 @@ NAPI_EXTERN napi_status napi_create_buffer(napi_env env,
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+ size_t length,
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+ void** data,
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+ napi_value* result);
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++#ifndef NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED
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+ NAPI_EXTERN napi_status napi_create_external_buffer(napi_env env,
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+ size_t length,
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+ void* data,
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+ napi_finalize finalize_cb,
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+ void* finalize_hint,
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+ napi_value* result);
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++#endif // NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED
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+ NAPI_EXTERN napi_status napi_create_buffer_copy(napi_env env,
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+ size_t length,
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+ const void* data,
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+diff --git a/test/js-native-api/test_general/test_general.c b/test/js-native-api/test_general/test_general.c
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+index 7b755ce9a9f202eaf91e5103d6c0204925f99cac..b474ab442cb763cb84ec77901da91a6f1471c946 100644
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+--- a/test/js-native-api/test_general/test_general.c
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++++ b/test/js-native-api/test_general/test_general.c
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+@@ -1,3 +1,8 @@
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++// we define NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED here to
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++// validate that it can be used as a form of test itself. It is
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++// not related to any of the other tests
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++// defined in the file
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++#define NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED
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+ #include <stdio.h>
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+ #include <stdlib.h>
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+ #include <stdint.h>
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+diff --git a/test/node-api/test_general/test_general.c b/test/node-api/test_general/test_general.c
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+index d430e2df4f3520fddbc5ce8d260adba565e6c3c9..b8d837d5e45650fcb9ba04030721b0f51377f078 100644
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+--- a/test/node-api/test_general/test_general.c
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++++ b/test/node-api/test_general/test_general.c
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+@@ -1,4 +1,9 @@
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+ #define NAPI_EXPERIMENTAL
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++// we define NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED here to validate that it can
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++// be used as a form of test itself. It is
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++// not related to any of the other tests
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++// defined in the file
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++#define NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED
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+ #include <node_api.h>
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+ #include <stdlib.h>
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+ #include "../../js-native-api/common.h"
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