bun_runtime 0.1.2

// @trace REQ-ENG-006
// WebSocket + Performance + TextEncoder/TextDecoder + atob/btoa + queueMicrotask
use ::std::cell::RefCell;
use ::std::ffi::CString;
use ::std::io::{Read, Write};
use ::std::net::TcpStream;
use ::std::net::ToSocketAddrs;
use ::std::ptr::NonNull;
use ::std::sync::atomic::{AtomicU64, Ordering};
use ::std::sync::{Arc, Mutex};
use ::std::time::Duration;
use bun_core::ZBox;

// @trace REQ-ENG-006 [code:bun_uws] — RFC 6455 codec primitives reused for
// both the plain ws:// (via WebSocketClient) and the wss:// (TLS-driven) path.
use bun_uws::ws_codec::apply_mask;

use mozjs::conversions::unsafe_jsstr_to_string;
use mozjs::jsapi::*;
use mozjs::jsval::{BooleanValue, Int32Value, JSVal, NullValue, ObjectValue, StringValue, UndefinedValue};
use mozjs::realm::AutoRealm;
use mozjs::rooted;
use mozjs::rust::wrappers2::{
    CallOriginalPromiseResolve, CallOriginalPromiseThen, JS_DefineFunction, JS_DefineProperty3,
    JS_NewPlainObject, NewArrayObject1,
};

use crate::gc_store::{gc_store_get, gc_store_insert, gc_store_remove};

// @trace REQ-ENG-005 [algorithm:base64] base64 via workspace bun_base64 (SIMD-accelerated)

// ── WebSocket client ──
// @trace REQ-ENG-006 [api:WebSocket] [code:bun_uws] — RFC 6455 framing and the
// plain-text (ws://) client handshake are delegated to `bun_uws::ws_client`
// (WebSocketClient / parse_ws_url / RecvOutcome) and `bun_uws::ws_codec` /
// `ws_handshake`. The wss:// (TLS) variant drives `bao_boringssl_bridge`'s
// TlsConnection over the TCP socket and reuses the same `bun_uws` codec /
// handshake primitives so the two schemes share one wire-format code path.
//
// @trace REQ-STL-001 — the wss:// TLS handshake applies the page's
// StealthProfile through the exact same application path fetch() uses
// (`stealth_http::stealth_profile_to_ssl_config` →
// `bun_http::configure_http_client_with_alpn`), so a page's WebSocket and
// its fetch present an identical JA3/JA4 fingerprint.
//
// Async model (root fix for ScriptThread blocking): `new WebSocket(..)` never
// connects on the JS thread. The constructor captures the thread's stealth
// profile, spawns a background worker that performs the full blocking connect
// (TCP + TLS + RFC 6455 handshake, ≤10s), and returns immediately with
// readyState=CONNECTING. The worker's outcome lands in an
// `Arc<Mutex<Option<..>>>` slot — the ONLY cross-thread channel (no JSObject
// pointers cross threads; BCE-20260621-001 rule). The JS-thread drain pump
// (`ws_pump_all`, wired into `timers::drain_and_check` /
// `timers::drain_one_pass` / the servo node-realm evaluate entry) consumes
// the slot (onopen/onerror) and pumps inbound frames (onmessage/onclose)
// with the sockets in non-blocking mode.

#[derive(Debug)]
#[allow(dead_code)]
enum WsMessage {
    Text(String),
    Binary(Vec<u8>),
    Close,
}

/// A TLS-over-TCP adapter implementing `std::io::{Read, Write}`. It owns the
/// raw `TcpStream` plus a BoringSSL `TlsConnection` and transparently drives
/// the TLS state machine (handshake + record decrypt/encrypt) on every I/O.
///
/// `bun_uws`'s `ws_handshake::client_handshake<S: Read + Write>` and
/// `ws_codec::FrameDecoder` consume this directly, so the wss:// path reuses
/// the exact same RFC 6455 code as the ws:// path.
struct TlsStream {
    tcp: TcpStream,
    tls: bao_boringssl_bridge::connection::TlsConnection,
    /// Decrypted plaintext not yet handed to the reader. `Read` callers (the
    /// WS handshake reads byte-at-a-time) may take less than one TLS record
    /// per read(); the surplus must survive across calls (BCE-20260814-WS-TLS:
    /// the prior adapter dropped it, corrupting the handshake).
    pending_plain: Vec<u8>,
    pending_off: usize,
}

impl TlsStream {
    /// Pump the TLS state machine: flush any pending outgoing ciphertext to the
    /// socket, then process inbound records until the TLS layer has decrypted
    /// data ready (or WouldBlock). Returns the decrypted plaintext bytes.
    fn pump_inbound(&mut self) -> ::std::io::Result<Vec<u8>> {
        loop {
            // Drain any ciphertext BoringSSL wants to send first so a
            // mid-handshake flight isn't stranded in the write BIO.
            self.flush_outgoing()?;
            let res = self.tls.process().map_err(|e| {
                ::std::io::Error::new(::std::io::ErrorKind::InvalidData, e.to_string())
            })?;
            if !res.plaintext.is_empty() {
                let mut joined = Vec::new();
                for chunk in res.plaintext {
                    joined.extend_from_slice(&chunk);
                }
                return Ok(joined);
            }
            // No decrypted data yet — read more ciphertext from the socket.
            let mut buf = [0u8; 16_384];
            match self.tcp.read(&mut buf) {
                Ok(0) => {
                    return Err(::std::io::Error::new(
                        ::std::io::ErrorKind::UnexpectedEof,
                        "tls peer closed",
                    ));
                }
                Ok(n) => self.tls.feed(&buf[..n]),
                Err(ref e)
                    if e.kind() == ::std::io::ErrorKind::WouldBlock
                        || e.kind() == ::std::io::ErrorKind::TimedOut =>
                {
                    return Err(::std::io::Error::from(::std::io::ErrorKind::WouldBlock));
                }
                Err(e) => return Err(e),
            }
        }
    }

    /// Write any pending ciphertext from BoringSSL's write BIO to the socket.
    fn flush_outgoing(&mut self) -> ::std::io::Result<()> {
        let outgoing = self.tls.take_outgoing();
        if outgoing.is_empty() {
            return Ok(());
        }
        self.tcp.write_all(&outgoing)
    }
}

impl ::std::io::Read for TlsStream {
    fn read(&mut self, buf: &mut [u8]) -> ::std::io::Result<usize> {
        // Serve buffered plaintext first; only pump the TLS state machine
        // when the buffer is drained (records can exceed the caller's buf).
        if self.pending_off >= self.pending_plain.len() {
            self.pending_plain = self.pump_inbound()?;
            self.pending_off = 0;
        }
        let avail = &self.pending_plain[self.pending_off..];
        let n = avail.len().min(buf.len());
        buf[..n].copy_from_slice(&avail[..n]);
        self.pending_off += n;
        Ok(n)
    }
}

impl ::std::io::Write for TlsStream {
    fn write(&mut self, buf: &[u8]) -> ::std::io::Result<usize> {
        let written = self
            .tls
            .write(buf)
            .map_err(|e| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, e.to_string()))?;
        self.flush_outgoing()?;
        Ok(written)
    }
    fn flush(&mut self) -> ::std::io::Result<()> {
        self.tcp.flush()
    }
}

/// Connection backend — plain ws:// over TCP, or wss:// over TLS.
enum WsConn {
    /// Plain WebSocket reusing `bun_uws::WebSocketClient` (RFC 6455 codec +
    /// handshake + masked client→server frames, all owned by bun_uws).
    Plain(bun_uws::ws_client::WebSocketClient),
    /// TLS WebSocket: a `TlsStream` driven through `bun_uws`'s codec/handshake.
    Tls {
        stream: TlsStream,
        decoder: bun_uws::ws_codec::FrameDecoder,
        closed: bool,
    },
}

impl WsConn {
    /// Connect to a `ws://` or `wss://` URL, applying the caller's stealth
    /// profile to the wss:// TLS handshake. Runs entirely on the caller's
    /// thread — the JS bridge only invokes this on a background worker.
    fn connect(
        url: &str,
        profile: &::std::option::Option<bao_stealth::StealthProfile>,
    ) -> ::std::result::Result<Self, String> {
        let (scheme, rest) = if let Some(r) = url.strip_prefix("ws://") {
            ("ws", r)
        } else if let Some(r) = url.strip_prefix("wss://") {
            ("wss", r)
        } else {
            // Fall back to ws:// semantics for bare hosts (preserves the prior
            // behavior where a scheme-less URL was treated as ws://).
            ("ws", url)
        };

        let (host, port, path) = split_authority_and_path(rest, scheme);
        if scheme == "wss" {
            Self::connect_tls(&host, port, &path, profile)
        } else {
            // ws:// — delegate to bun_uws::WebSocketClient (reconstructs the
            // canonical URL because bun_uws::parse_ws_url is scheme-strict).
            let canonical = if url.starts_with("ws://") || url.starts_with("wss://") {
                url.to_string()
            } else {
                format!("ws://{}", url)
            };
            let client = bun_uws::ws_client::WebSocketClient::connect(&canonical)
                .map_err(|e| format!("ws connect: {}", e))?;
            Ok(WsConn::Plain(client))
        }
    }

    fn connect_tls(
        host: &str,
        port: u16,
        path: &str,
        profile: &::std::option::Option<bao_stealth::StealthProfile>,
    ) -> ::std::result::Result<Self, String> {
        let addr = format!("{}:{}", host, port);
        let socket_addr = addr
            .to_socket_addrs()
            .map_err(|e| format!("invalid address: {}", e))?
            .next()
            .ok_or_else(|| format!("no address for {}", addr))?;
        let mut tcp = TcpStream::connect_timeout(&socket_addr, Duration::from_secs(10))
            .map_err(|e| format!("connect failed: {}", e))?;
        tcp.set_nonblocking(false).ok();
        tcp.set_read_timeout(Some(Duration::from_secs(10))).ok();

        // Build the BoringSSL client connection and drive the TLS handshake.
        let tls_client = bao_boringssl_bridge::client::TlsClient::new()
            .map_err(|e| format!("tls client init: {}", e))?;
        let mut tls =
            bao_boringssl_bridge::connection::TlsConnection::new_client(&tls_client, host)
                .map_err(|e| format!("tls conn: {}", e))?;

        // STEALTH (REQ-STL-001): apply the page's TLS fingerprint through the
        // same application path fetch() uses — cipher list / TLS 1.3 suites /
        // curves / sigalgs, plus SNI and ALPN(http/1.1) (what a browser
        // offers on a WebSocket TLS connection). Must run BEFORE the first
        // `process()` call so the config lands in the ClientHello.
        let ssl_config = crate::stealth_http::stealth_profile_to_ssl_config(profile);
        let host_c = CString::new(host).map_err(|_| format!("invalid host: {}", host))?;
        {
            let ssl = tls.ssl_ptr();
            if !ssl.is_null() {
                // SAFETY: `ssl_ptr` returns the live SSL handle of this
                // connection; `configure_http_client_with_alpn` only issues
                // SSL_set_* configuration calls on it.
                bun_http::configure_http_client_with_alpn(
                    unsafe { &mut *ssl },
                    host_c.as_ptr(),
                    bun_http::AlpnOffer::H1,
                    Some(&ssl_config),
                );

                // TLS session resumption: offer the cached session for this
                // origin before the handshake starts (same precondition as
                // the stealth config above — the ClientHello has not been
                // serialized yet). Salt semantics match the bun_http fetch
                // path: no stealth profile → salt 0 (the default-profile
                // pool shared across stacks); a profile → the SSLConfig
                // content hash, so sessions that short-circuit parameter
                // negotiation never cross profiles.
                let profile_salt = if profile.is_some() {
                    ssl_config.content_hash()
                } else {
                    0
                };
                bao_boringssl_bridge::session_cache::offer_session(ssl, host, port, profile_salt);
            }
        }

        // Complete the TLS handshake by pumping records until active.
        // BCE-20260814-WS-TLS: the flight produced by `process()` MUST be
        // flushed to the socket BEFORE blocking on read — the prior order
        // (take_outgoing → process → read) left the ClientHello stranded in
        // the write BIO while waiting for a ServerHello that could never
        // arrive (both sides reading → deadlock, surfaced as "handshake
        // stalled" after the 10s timeout).
        loop {
            match tls.process() {
                Ok(res) => {
                    use bao_boringssl_bridge::connection::TlsState;
                    // Flush every flight the state machine just produced
                    // (ClientHello / Finished) before waiting on the peer.
                    loop {
                        let outgoing = tls.take_outgoing();
                        if outgoing.is_empty() {
                            break;
                        }
                        if tcp.write_all(&outgoing).is_err() {
                            return Err("tls handshake write failed".to_string());
                        }
                    }
                    if res.state == TlsState::Active || res.state == TlsState::PeerClosed {
                        break;
                    }
                    // Still handshaking — read more ciphertext from the socket.
                    let mut buf = [0u8; 16_384];
                    match tcp.read(&mut buf) {
                        Ok(n) if n > 0 => tls.feed(&buf[..n]),
                        _ => {
                            return Err("tls handshake stalled".to_string());
                        }
                    }
                }
                Err(e) => return Err(format!("tls handshake: {}", e)),
            }
        }

        let mut stream = TlsStream {
            tcp,
            tls,
            pending_plain: Vec::new(),
            pending_off: 0,
        };
        // RFC 6455 client handshake over the TLS stream (bun_uws-owned).
        bun_uws::ws_handshake::client_handshake(&mut stream, host, &path)
            .map_err(|e| format!("ws handshake: {:?}", e))?;
        Ok(WsConn::Tls {
            stream,
            decoder: bun_uws::ws_codec::FrameDecoder::new(),
            closed: false,
        })
    }

    fn send_text(&mut self, text: &str) -> ::std::result::Result<(), String> {
        match self {
            WsConn::Plain(c) => c.send_text(text).map_err(|e| format!("send failed: {}", e)),
            WsConn::Tls { stream, .. } => {
                let payload = text.as_bytes();
                let key = bun_uws::ws_codec::gen_mask_key();
                let mut frame = Vec::with_capacity(payload.len() + 14);
                frame.push(0x81); // FIN + text opcode
                push_masked_len(&mut frame, payload.len());
                frame.extend_from_slice(&key);
                let mut masked = payload.to_vec();
                apply_mask(&mut masked, &key);
                // BCE-20260814-WS-TLS: the masked payload was never appended
                // to the frame — every wss:// send() transmitted header+key
                // only, dropping the message body (peer then misparsed the
                // next frame's bytes as this frame's payload).
                frame.extend_from_slice(&masked);
                stream
                    .write_all(&frame)
                    .map_err(|e| format!("send failed: {}", e))
            }
        }
    }

    fn read_message(&mut self) -> ::std::result::Result<WsMessage, String> {
        match self {
            WsConn::Plain(c) => match c.recv().map_err(|e| format!("recv: {}", e))? {
                bun_uws::ws_client::RecvOutcome::Message(opcode, payload) => match opcode {
                    bun_uws::ws_codec::Opcode::Text => Ok(WsMessage::Text(
                        String::from_utf8_lossy(&payload).into_owned(),
                    )),
                    bun_uws::ws_codec::Opcode::Binary => Ok(WsMessage::Binary(payload)),
                    _ => Ok(WsMessage::Binary(payload)),
                },
                bun_uws::ws_client::RecvOutcome::Closed => Ok(WsMessage::Close),
                bun_uws::ws_client::RecvOutcome::Timeout => Err("wouldblock".to_string()),
            },
            WsConn::Tls {
                stream,
                decoder,
                closed,
            } => {
                if *closed {
                    return Ok(WsMessage::Close);
                }
                let header = match decoder.decode_frame(stream) {
                    Ok(Some(h)) => h,
                    Ok(None) => return Err("wouldblock".to_string()),
                    Err(ref e)
                        if e.kind() == ::std::io::ErrorKind::WouldBlock
                            || e.kind() == ::std::io::ErrorKind::TimedOut =>
                    {
                        return Err("wouldblock".to_string());
                    }
                    Err(ref e) if e.kind() == ::std::io::ErrorKind::UnexpectedEof => {
                        *closed = true;
                        return Ok(WsMessage::Close);
                    }
                    Err(e) => return Err(format!("recv: {}", e)),
                };
                let mut payload = if header.mask {
                    let mask_key = decoder.take_mask();
                    let mut p = decoder.take_payload(&header);
                    apply_mask(&mut p, &mask_key);
                    p
                } else {
                    decoder.take_payload(&header)
                };
                match header.opcode {
                    bun_uws::ws_codec::Opcode::Text => Ok(WsMessage::Text(
                        String::from_utf8_lossy(&payload).into_owned(),
                    )),
                    bun_uws::ws_codec::Opcode::Binary => Ok(WsMessage::Binary(payload)),
                    bun_uws::ws_codec::Opcode::Close => {
                        *closed = true;
                        Ok(WsMessage::Close)
                    }
                    bun_uws::ws_codec::Opcode::Ping => {
                        // Echo pong (RFC 6455 §5.5.2) using bun_uws codec mask.
                        let key = bun_uws::ws_codec::gen_mask_key();
                        let mut frame = vec![0x8A]; // FIN + pong
                        push_masked_len(&mut frame, payload.len());
                        frame.extend_from_slice(&key);
                        apply_mask(&mut payload, &key);
                        frame.extend_from_slice(&payload);
                        stream
                            .write_all(&frame)
                            .map_err(|e| format!("pong: {}", e))?;
                        self.read_message()
                    }
                    bun_uws::ws_codec::Opcode::Pong | bun_uws::ws_codec::Opcode::Continuation => {
                        self.read_message()
                    }
                }
            }
        }
    }

    /// Send a masked close frame (code 1000). Deliberately does NOT delegate
    /// to `WebSocketClient::close()` for the Plain variant — that method
    /// `shutdown(Both)`s the socket immediately, killing the TCP connection
    /// before the peer's Close reply can arrive (no close handshake). Here
    /// only the frame is sent; the socket stays readable so the drain pump
    /// can observe the peer's Close reply and fire onclose.
    fn close(&mut self) -> ::std::result::Result<(), String> {
        let frame = encode_masked_close_frame();
        match self {
            WsConn::Plain(c) => {
                if c.is_closed() {
                    return Ok(());
                }
                c.stream_mut()
                    .write_all(&frame)
                    .map_err(|e| format!("close failed: {}", e))
            }
            WsConn::Tls { stream, .. } => {
                // Send the close frame only. Do NOT set the internal `closed`
                // flag here — `read_message` uses it to short-circuit, which
                // would discard inbound frames still in flight (post-close
                // messages are delivered until the close handshake completes,
                // browser semantics). The flag flips when the peer's Close
                // frame is actually read.
                let _ = stream.write_all(&frame);
                Ok(())
            }
        }
    }

    /// Switch the underlying socket between blocking and non-blocking so the
    /// initial drain loop can poll for buffered frames without hanging.
    fn set_nonblocking(&mut self, nonblocking: bool) {
        match self {
            WsConn::Plain(c) => {
                let _ = c.stream_mut().set_nonblocking(nonblocking);
            }
            WsConn::Tls { stream, .. } => {
                let _ = stream.tcp.set_nonblocking(nonblocking);
            }
        }
    }
}

/// Split `host[:port]/path` from the scheme-stripped remainder. Default port
/// is 80 for ws://, 443 for wss://.
fn split_authority_and_path(rest: &str, scheme: &str) -> (String, u16, String) {
    let default_port = if scheme == "wss" { 443 } else { 80 };
    let (authority, path) = match rest.find('/') {
        Some(i) => (&rest[..i], rest[i..].to_string()),
        None => (rest, "/".to_string()),
    };
    let (host, port) = match authority.rfind(':') {
        Some(i) => (
            authority[..i].to_string(),
            authority[i + 1..].parse::<u16>().unwrap_or(default_port),
        ),
        None => (authority.to_string(), default_port),
    };
    (host, port, path)
}

/// Masked close frame (FIN + Close, code 1000), client→server layout.
fn encode_masked_close_frame() -> Vec<u8> {
    let key = bun_uws::ws_codec::gen_mask_key();
    let mut frame = vec![0x88];
    let payload = 1000u16.to_be_bytes();
    push_masked_len(&mut frame, payload.len());
    frame.extend_from_slice(&key);
    let mut masked = payload.to_vec();
    apply_mask(&mut masked, &key);
    frame.extend_from_slice(&masked);
    frame
}

/// Append the masked-length + (caller-supplied) mask bytes layout for a
/// client→server frame, matching `bun_uws::ws_codec::FrameEncoder::encode_frame`.
fn push_masked_len(frame: &mut Vec<u8>, len: usize) {
    let mask_bit = 0x80u8;
    if len < 126 {
        frame.push((len as u8) | mask_bit);
    } else if len <= u16::MAX as usize {
        frame.push(126u8 | mask_bit);
        frame.extend_from_slice(&(len as u16).to_be_bytes());
    } else {
        frame.push(127u8 | mask_bit);
        frame.extend_from_slice(&(len as u64).to_be_bytes());
    }
}

// ── JS bridge ──

/// Global counter for generating unique GcStore keys for WebSocket objects.
static WS_ID_COUNTER: AtomicU64 = AtomicU64::new(0);

/// Per-connection registry entry. Everything except `connect_slot`'s payload
/// is confined to the thread that constructed the WebSocket (the JS thread);
/// the background connect worker communicates exclusively through the
/// `Arc<Mutex<..>>` slot — no JSObject pointers cross threads
/// (BCE-20260621-001 rule).
struct WsEntry {
    /// Live connection once the background connect completed and onopen
    /// dispatched. Polled non-blocking by `ws_pump_all`.
    client: ::std::option::Option<WsConn>,
    /// Present while the background connect worker is in flight. The worker
    /// writes `Some(Ok(..))` / `Some(Err(..))` exactly once; the JS-thread
    /// drain pump consumes it. `None` + `client: None` = dead entry.
    connect_slot: ::std::option::Option<
        Arc<Mutex<::std::option::Option<::std::result::Result<WsConn, String>>>>,
    >,
    /// JS called close() while still CONNECTING — when the connect lands, the
    /// pump closes it immediately instead of firing onopen.
    close_requested: bool,
    /// JS called close() on an open connection — the close frame was sent;
    /// the pump fires onclose when the peer's Close reply (or transport
    /// error) lands (browser close-handshake semantics).
    close_initiated: bool,
    /// The realm global the WebSocket JS object lives in (captured at
    /// construction). Every dispatch AutoRealms into it (realm-per-context
    /// model, c943b1cc) so the GcStore property lookup and handler call run
    /// in the right compartment.
    realm_global: *mut JSObject,
    js_obj_key: String,
}

impl WsEntry {
    fn is_live(&self) -> bool {
        self.connect_slot.is_some() || self.client.is_some()
    }
}

thread_local! {
    static WS_CONNECTIONS: RefCell<Vec<WsEntry>> = const { RefCell::new(Vec::new()) };
}

/// True while any WebSocket on this thread is connecting or open. Wired into
/// the event-loop liveness checks (`timers::drain_and_check` return value) so
/// the eval loop keeps draining while WS traffic is in flight.
pub fn ws_has_pending() -> bool {
    WS_CONNECTIONS.with(|c| c.borrow().iter().any(|e| e.is_live()))
}

pub fn install_websocket_constructor(
    cx: &mut mozjs::context::JSContext,
    global: mozjs::rust::Handle<*mut JSObject>,
) {
    unsafe {
        let ws_fun = JS_NewFunction(
            cx.raw_cx(),
            Some(websocket_constructor),
            1,
            JSFUN_CONSTRUCTOR,
            c"WebSocket".as_ptr(),
        );
        if !ws_fun.is_null() {
            let ctor_obj = JS_GetFunctionObject(ws_fun);
            if !ctor_obj.is_null() {
                let val = mozjs::jsval::ObjectValue(ctor_obj);
                rooted!(&in(cx) let v = val);
                JS_DefineProperty(
                    cx.raw_cx(),
                    global.into(),
                    c"WebSocket".as_ptr(),
                    v.handle().into(),
                    (JSPROP_ENUMERATE | JSPROP_PERMANENT) as u32,
                );

                rooted!(&in(cx) let ctor_root = ctor_obj);
                for (name, value) in &[
                    ("CONNECTING", 0i32),
                    ("OPEN", 1),
                    ("CLOSING", 2),
                    ("CLOSED", 3),
                ] {
                    let c_name = ZBox::from_bytes(name.as_bytes());
                    rooted!(&in(cx) let iv = Int32Value(*value));
                    JS_DefineProperty(
                        cx.raw_cx(),
                        ctor_root.handle().into(),
                        c_name.as_ptr(),
                        iv.handle().into(),
                        (JSPROP_ENUMERATE | JSPROP_READONLY) as u32,
                    );
                }
            }
        }
    }
}

/// Fire an `onXXX` handler stored on the WebSocket object. `realm_global` is
/// the realm global captured at construction; dispatch AutoRealms into it
/// (the drain pump runs with no realm entered — realm-per-context model).
/// `this` for the call is the WebSocket object (browser semantics).
///
/// # Safety
/// `cx` must be a live JSContext on the current thread; `realm_global` must
/// be the (always-rooted) global of a live realm on that context.
unsafe fn ws_trigger_event(
    cx: *mut JSContext,
    realm_global: *mut JSObject,
    ws_obj_key: &str,
    event_name: &str,
    data_val: Option<JSVal>,
) {
    if realm_global.is_null() {
        return;
    }
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    rooted!(&in(cx_ref) let global_root = realm_global);
    let mut realm = AutoRealm::new_from_handle(cx_ref, global_root.handle());
    let cx_ref: &mut mozjs::context::JSContext = &mut realm;

    // Root the event data FIRST — gc_store_get / JS_GetProperty below can
    // trigger GC and an unrooted JSVal argument would dangle. Always root
    // (undefined placeholder when the event carries no data) so the guard
    // lives for the whole frame.
    let has_data = data_val.is_some();
    let dv_in = data_val.unwrap_or_else(UndefinedValue);
    rooted!(&in(cx_ref) let data_root = dv_in);

    let ws_obj = match gc_store_get(cx, ws_obj_key) {
        Some(obj) => obj,
        None => return,
    };
    rooted!(&in(cx_ref) let ws_obj_root = ws_obj);
    let mut handler_val = UndefinedValue();
    let c_name = ZBox::from_bytes(event_name.as_bytes());
    JS_GetProperty(
        cx,
        ws_obj_root.handle().into(),
        c_name.as_ptr(),
        MutableHandle::<Value> {
            _phantom_0: ::std::marker::PhantomData,
            ptr: &mut handler_val,
        },
    );
    if handler_val.is_object() {
        rooted!(&in(cx_ref) let handler_obj_root = handler_val.to_object());
        if JS_ObjectIsFunction(handler_obj_root.get()) {
            rooted!(&in(cx_ref) let handler_jsval = ObjectValue(handler_obj_root.get()));

            rooted!(&in(cx_ref) let event_obj = mozjs_sys::jsapi::JS_NewPlainObject(cx));
            if !event_obj.get().is_null() {
                if has_data {
                    JS_DefineProperty(
                        cx,
                        event_obj.handle().into(),
                        c"data".as_ptr(),
                        data_root.handle().into(),
                        JSPROP_ENUMERATE as u32,
                    );
                }
                let ev_val = ObjectValue(event_obj.get());
                let call_args = HandleValueArray {
                    length_: 1,
                    elements_: &ev_val,
                };
                let mut rval = UndefinedValue();
                let ok = JS_CallFunctionValue(
                    cx,
                    ws_obj_root.handle().into(),
                    handler_jsval.handle().into(),
                    &call_args,
                    MutableHandle::<Value> {
                        _phantom_0: ::std::marker::PhantomData,
                        ptr: &mut rval,
                    },
                );
                if !ok {
                    // BCE (P0 browser startup panic, servo error.rs:74): the
                    // user handler threw. The old `let _ =` left the pending
                    // exception on the ScriptThread context (browser mode
                    // kills the ScriptThread via servo's
                    // `assert!(!JS_IsExceptionPending)`; node mode silently
                    // swallowed the throw). Capture, clear, and route it —
                    // same contract as timers.rs fire_callback.
                    let mut exn = UndefinedValue();
                    JS_GetPendingException(
                        cx,
                        MutableHandle::<Value> {
                            _phantom_0: ::std::marker::PhantomData,
                            ptr: &mut exn,
                        },
                    );
                    JS_ClearPendingException(cx);
                    rooted!(&in(cx_ref) let reason_root = exn);
                    if !exn.is_undefined() {
                        crate::uncaught::route_uncaught_exception(cx, exn);
                    }
                }
            }
        }
    }
}

unsafe extern "C" fn ws_send(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    if argc == 0 {
        JS_ReportErrorUTF8(cx, c"WebSocket.send() requires a message argument".as_ptr());
        return false;
    }
    let msg_val = *args.get(0).ptr;

    let wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    rooted!(&in(wrapped_cx) let this_obj = args.thisv().to_object());
    let mut idx_val = Int32Value(-1);
    JS_GetProperty(
        cx,
        this_obj.handle().into(),
        c"_wsIdx".as_ptr(),
        MutableHandle::<Value> {
            _phantom_0: ::std::marker::PhantomData,
            ptr: &mut idx_val,
        },
    );
    let idx = idx_val.to_int32() as usize;

    let send_result = WS_CONNECTIONS.with(|c| {
        let mut conns = c.borrow_mut();
        match conns.get_mut(idx) {
            // Browser parity: send() while CONNECTING/CLOSED throws
            // InvalidStateError (never silently drops the message).
            Some(e) if e.client.is_some() => {
                let s = unsafe_jsstr_to_string(cx, NonNull::new_unchecked(msg_val.to_string()));
                e.client.as_mut().unwrap().send_text(&s)
            }
            Some(e) if e.connect_slot.is_some() => {
                Err("InvalidStateError: WebSocket is still connecting".to_string())
            }
            _ => Err("InvalidStateError: WebSocket is already closed".to_string()),
        }
    });

    if let Err(e) = send_result {
        let msg = format!("WebSocket send failed: {}", e);
        let c_msg = ZBox::from_bytes(msg.as_bytes());
        JS_ReportErrorUTF8(cx, c"%s".as_ptr(), c_msg.as_ptr());
        return false;
    }
    args.rval().set(UndefinedValue());
    true
}

unsafe extern "C" fn ws_close_fn(cx: *mut JSContext, _argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, _argc);
    let wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    rooted!(&in(wrapped_cx) let this_obj = args.thisv().to_object());

    let mut idx_val = Int32Value(-1);
    JS_GetProperty(
        cx,
        this_obj.handle().into(),
        c"_wsIdx".as_ptr(),
        MutableHandle::<Value> {
            _phantom_0: ::std::marker::PhantomData,
            ptr: &mut idx_val,
        },
    );
    let idx = idx_val.to_int32() as usize;

    WS_CONNECTIONS.with(|c| {
        let mut conns = c.borrow_mut();
        if let Some(e) = conns.get_mut(idx) {
            if e.client.is_some() && !e.close_initiated {
                // Send the close frame once; keep the socket alive so the
                // pump can see the peer's Close reply and fire onclose
                // (close handshake).
                if let Some(client) = &mut e.client {
                    let _ = client.close();
                }
                e.close_initiated = true;
            } else if e.connect_slot.is_some() {
                // Still CONNECTING — flag it; the pump closes immediately
                // when the background connect lands (no onopen).
                e.close_requested = true;
            }
        }
    });

    rooted!(&in(wrapped_cx) let closing_val = Int32Value(2));
    JS_SetProperty(
        cx,
        this_obj.handle().into(),
        c"readyState".as_ptr(),
        closing_val.handle().into(),
    );
    args.rval().set(UndefinedValue());
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn websocket_constructor(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    if argc == 0 {
        JS_ReportErrorUTF8(cx, c"WebSocket requires a URL argument".as_ptr());
        return false;
    }
    let url_val = *args.get(0).ptr;
    if !url_val.is_string() {
        JS_ReportErrorUTF8(cx, c"WebSocket URL must be a string".as_ptr());
        return false;
    }
    let url = unsafe_jsstr_to_string(cx, NonNull::new_unchecked(url_val.to_string()));

    let wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    rooted!(&in(wrapped_cx) let ws_obj = mozjs_sys::jsapi::JS_NewPlainObject(cx));
    if ws_obj.get().is_null() {
        args.rval().set(UndefinedValue());
        return true;
    }

    {
        let c_url = ZBox::from_bytes(url.as_bytes());
        let js_str = JS_NewStringCopyZ(cx, c_url.as_ptr());
        if !js_str.is_null() {
            rooted!(&in(wrapped_cx) let v = StringValue(&*js_str));
            JS_DefineProperty(
                cx,
                ws_obj.handle().into(),
                c"url".as_ptr(),
                v.handle().into(),
                JSPROP_ENUMERATE as u32,
            );
        }
    }

    rooted!(&in(wrapped_cx) let state_val = Int32Value(0));
    JS_DefineProperty(
        cx,
        ws_obj.handle().into(),
        c"readyState".as_ptr(),
        state_val.handle().into(),
        JSPROP_ENUMERATE as u32,
    );

    rooted!(&in(wrapped_cx) let ba_val = Int32Value(0));
    JS_DefineProperty(
        cx,
        ws_obj.handle().into(),
        c"bufferedAmount".as_ptr(),
        ba_val.handle().into(),
        JSPROP_ENUMERATE as u32,
    );

    for name in &["onopen", "onmessage", "onerror", "onclose"] {
        let c_name = ZBox::from_bytes(name.as_bytes());
        rooted!(&in(wrapped_cx) let ud = UndefinedValue());
        JS_DefineProperty(
            cx,
            ws_obj.handle().into(),
            c_name.as_ptr(),
            ud.handle().into(),
            JSPROP_ENUMERATE as u32,
        );
    }

    mozjs_sys::jsapi::JS_DefineFunction(
        cx,
        ws_obj.handle().into(),
        c"send".as_ptr(),
        Some(ws_send),
        1,
        JSPROP_ENUMERATE as u32,
    );
    mozjs_sys::jsapi::JS_DefineFunction(
        cx,
        ws_obj.handle().into(),
        c"close".as_ptr(),
        Some(ws_close_fn),
        0,
        JSPROP_ENUMERATE as u32,
    );

    // Permission parity with fetch(): the page's net scope governs
    // WebSocket egress too (Permission sandbox).
    {
        let (scheme, rest) = if let Some(r) = url.strip_prefix("ws://") {
            ("ws", r)
        } else if let Some(r) = url.strip_prefix("wss://") {
            ("wss", r)
        } else {
            ("ws", url.as_str())
        };
        let (host, _, _) = split_authority_and_path(rest, scheme);
        if let ::std::result::Result::Err(e) = crate::permission_bridge::check_net(&host) {
            let c_msg = ZBox::from_bytes(e.as_bytes());
            JS_ReportErrorUTF8(cx, c"%s".as_ptr(), c_msg.as_ptr());
            return false;
        }
    }

    // Store the JS WebSocket object in GcStore for GC safety.
    let ws_id = WS_ID_COUNTER.fetch_add(1, Ordering::Relaxed);
    let ws_key = format!("ws_{}", ws_id);
    gc_store_insert(cx, &ws_key, ws_obj.get());

    // Capture the realm global (dispatch AutoRealm target) and the thread's
    // stealth profile HERE, on the JS thread — both are thread-local state.
    let realm_global = CurrentGlobalOrNull(cx);
    let profile = crate::fetch_api::get_fetch_stealth_profile();

    // Register the entry with a pending connect slot; _wsIdx must exist
    // immediately (send()/close() may be called while CONNECTING).
    let slot: Arc<Mutex<::std::option::Option<::std::result::Result<WsConn, String>>>> =
        Arc::new(Mutex::new(None));
    let ws_idx = WS_CONNECTIONS.with(|c| {
        let mut conns = c.borrow_mut();
        conns.push(WsEntry {
            client: None,
            connect_slot: Some(Arc::clone(&slot)),
            close_requested: false,
            close_initiated: false,
            realm_global,
            js_obj_key: ws_key.clone(),
        });
        conns.len() - 1
    });
    rooted!(&in(wrapped_cx) let idx_val = Int32Value(ws_idx as i32));
    JS_DefineProperty(
        cx,
        ws_obj.handle().into(),
        c"_wsIdx".as_ptr(),
        idx_val.handle().into(),
        0,
    );

    // Background connect: the full blocking sequence (TCP + TLS with the
    // page's stealth fingerprint + RFC 6455 handshake, ≤10s) runs OFF the JS
    // thread. The Arc<Mutex> slot is the only cross-thread channel; the
    // JS-thread drain pump (`ws_pump_all`) consumes the outcome and fires
    // onopen / onerror(+onclose). No JSObject pointer crosses threads.
    let url_owned = url.clone();
    ::std::thread::spawn(move || {
        let result = WsConn::connect(&url_owned, &profile);
        if let Ok(mut guard) = slot.lock() {
            *guard = Some(result);
        }
        // If the JS thread is gone (process teardown), the slot leaks —
        // bounded by the 10s connect timeout.
    });

    // readyState stays 0 (CONNECTING). The constructor returns immediately —
    // connect failures surface as onerror + onclose (browser semantics),
    // never a constructor throw, never a silent swallow.
    args.rval().set(mozjs::jsval::ObjectValue(ws_obj.get()));
    true
}

// ── WebSocket drain pump ──
// Runs on the JS thread from the event-loop drain paths. Consumes completed
// background connects and pumps inbound frames. Never blocks (try_lock +
// non-blocking sockets); JS handlers run OUTSIDE the WS_CONNECTIONS borrow so
// they can call send()/close() reentrantly.

/// One action peeled off the registry per iteration (JS calls happen after
/// the borrow is dropped).
enum PumpAction {
    /// Background connect finished (slot outcome consumed).
    ConnectDone(usize, ::std::result::Result<WsConn, String>),
    /// Text frame received on an open connection.
    TextMessage(usize, String),
    /// Binary frame received on an open connection.
    BinaryMessage(usize, Vec<u8>),
    /// Close frame received / transport error — connection is dead.
    /// `msg` is Some for a transport error (fires onerror first), None for a
    /// clean close handshake.
    Closed(usize, ::std::option::Option<String>),
}

/// Pump all WebSockets on this thread. Called from `timers::drain_and_check`,
/// `timers::drain_one_pass`, and the servo node-realm evaluate entry.
pub fn ws_pump_all(raw_cx: *mut JSContext) {
    loop {
        let action = WS_CONNECTIONS.with(|c| {
            let mut conns = c.borrow_mut();
            for (idx, e) in conns.iter_mut().enumerate() {
                // 1. Completed background connects (try_lock — the worker
                //    may still hold the lock writing its outcome). Take the
                //    slot out first so the MutexGuard borrow ends before the
                //    assignment below.
                if e.connect_slot.is_some() {
                    let taken = e
                        .connect_slot
                        .as_ref()
                        .unwrap()
                        .try_lock()
                        .ok()
                        .and_then(|mut guard| guard.take());
                    if let ::std::option::Option::Some(res) = taken {
                        e.connect_slot = ::std::option::Option::None;
                        return ::std::option::Option::Some(PumpAction::ConnectDone(idx, res));
                    }
                    continue;
                }
                // 2. Inbound frames on open connections (non-blocking).
                //    Frames received after a locally-initiated close are
                //    still delivered (browser semantics: messages queue
                //    until the close handshake completes).
                let ::std::option::Option::Some(client) = &mut e.client else {
                    continue;
                };
                match client.read_message() {
                    Ok(WsMessage::Text(t)) => {
                        return ::std::option::Option::Some(PumpAction::TextMessage(idx, t))
                    }
                    Ok(WsMessage::Binary(b)) => {
                        return ::std::option::Option::Some(PumpAction::BinaryMessage(idx, b))
                    }
                    Ok(WsMessage::Close) => {
                        // Echo the close handshake unless we already sent
                        // our close frame (close_initiated).
                        if !e.close_initiated {
                            let _ = client.close();
                        }
                        e.client = ::std::option::Option::None;
                        return ::std::option::Option::Some(PumpAction::Closed(idx, None));
                    }
                    Err(err) if err == "wouldblock" => continue,
                    Err(err) => {
                        // Transport error — explicit surface, never silent.
                        let _ = client.close();
                        e.client = ::std::option::Option::None;
                        return ::std::option::Option::Some(PumpAction::Closed(
                            idx,
                            ::std::option::Option::Some(err),
                        ));
                    }
                }
            }
            ::std::option::Option::None
        });

        match action {
            ::std::option::Option::Some(PumpAction::ConnectDone(idx, res)) => unsafe {
                ws_connect_dispatch(raw_cx, idx, res);
            },
            ::std::option::Option::Some(PumpAction::TextMessage(idx, text)) => unsafe {
                ws_message_dispatch(raw_cx, idx, ::std::option::Option::Some(text), None);
            },
            ::std::option::Option::Some(PumpAction::BinaryMessage(idx, bytes)) => unsafe {
                ws_message_dispatch(raw_cx, idx, None, ::std::option::Option::Some(bytes));
            },
            ::std::option::Option::Some(PumpAction::Closed(idx, err)) => unsafe {
                ws_closed_dispatch(raw_cx, idx, err);
            },
            ::std::option::Option::None => break,
        }
    }
}

/// Snapshot of the dispatch-relevant fields of one entry.
struct WsDispatchInfo {
    realm_global: *mut JSObject,
    js_obj_key: String,
    is_open: bool,
}

fn ws_entry_info(idx: usize) -> ::std::option::Option<WsDispatchInfo> {
    WS_CONNECTIONS.with(|c| {
        c.borrow().get(idx).map(|e| WsDispatchInfo {
            realm_global: e.realm_global,
            js_obj_key: e.js_obj_key.clone(),
            is_open: e.client.is_some(),
        })
    })
}

/// Set `readyState` on the stored WebSocket object (inside its realm).
///
/// # Safety
/// `raw_cx` must be a live JSContext on the current thread.
unsafe fn ws_set_ready_state(
    raw_cx: *mut JSContext,
    realm_global: *mut JSObject,
    ws_key: &str,
    state: i32,
) {
    if realm_global.is_null() {
        return;
    }
    // Enter the realm FIRST — gc_store_get resolves through
    // CurrentGlobalOrNull, which is null while the drain pump runs.
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(raw_cx));
    let cx_ref = &mut wrapped_cx;
    rooted!(&in(cx_ref) let global_root = realm_global);
    let mut realm = AutoRealm::new_from_handle(cx_ref, global_root.handle());
    let cx_ref: &mut mozjs::context::JSContext = &mut realm;
    let ws_obj = match gc_store_get(raw_cx, ws_key) {
        Some(o) => o,
        None => return,
    };
    rooted!(&in(cx_ref) let ws_obj_root = ws_obj);
    rooted!(&in(cx_ref) let state_val = Int32Value(state));
    JS_SetProperty(
        raw_cx,
        ws_obj_root.handle().into(),
        c"readyState".as_ptr(),
        state_val.handle().into(),
    );
}

/// Background connect completed: install the connection and fire onopen, or
/// surface the failure as onerror + onclose (explicit, never silent).
///
/// # Safety
/// `raw_cx` must be a live JSContext on the current thread.
unsafe fn ws_connect_dispatch(
    raw_cx: *mut JSContext,
    idx: usize,
    res: ::std::result::Result<WsConn, String>,
) {
    let info = match ws_entry_info(idx) {
        Some(i) => i,
        None => return,
    };
    match res {
        Ok(mut client) => {
            // Non-blocking from here on — the drain pump polls this socket.
            client.set_nonblocking(true);
            enum Landed {
                Open,
                CloseNow,
            }
            let landed = WS_CONNECTIONS.with(|c| {
                let mut conns = c.borrow_mut();
                match conns.get_mut(idx) {
                    // close() was called while CONNECTING: never open it.
                    ::std::option::Option::Some(e) if e.close_requested => {
                        e.close_requested = false;
                        Landed::CloseNow
                    }
                    ::std::option::Option::Some(e) => {
                        e.client = ::std::option::Option::Some(client);
                        Landed::Open
                    }
                    ::std::option::Option::None => Landed::CloseNow,
                }
            });
            match landed {
                Landed::Open => {
                    ws_set_ready_state(raw_cx, info.realm_global, &info.js_obj_key, 1);
                    ws_trigger_event(raw_cx, info.realm_global, &info.js_obj_key, "onopen", None);
                }
                Landed::CloseNow => {
                    // `client` was not installed; dropping it closes the
                    // socket (TcpStream Drop).
                    ws_set_ready_state(raw_cx, info.realm_global, &info.js_obj_key, 3);
                    ws_trigger_event(raw_cx, info.realm_global, &info.js_obj_key, "onclose", None);
                    gc_store_remove(raw_cx, &info.js_obj_key);
                }
            }
        }
        Err(msg) => {
            // Connect failed: CLOSED + onerror(with the reason) + onclose.
            ws_set_ready_state(raw_cx, info.realm_global, &info.js_obj_key, 3);
            // Enter the realm before creating the error string — allocation
            // needs a valid zone (the pump runs with no realm entered).
            let data = if !info.realm_global.is_null() {
                let mut wrapped_cx =
                    mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(raw_cx));
                let cx_ref = &mut wrapped_cx;
                rooted!(&in(cx_ref) let global_root = info.realm_global);
                let mut realm = AutoRealm::new_from_handle(cx_ref, global_root.handle());
                let _cx_in_realm: &mut mozjs::context::JSContext = &mut realm;
                let c_msg = ZBox::from_bytes(msg.as_bytes());
                let js_str = JS_NewStringCopyZ(raw_cx, c_msg.as_ptr());
                if !js_str.is_null() {
                    ::std::option::Option::Some(StringValue(&*js_str))
                } else {
                    ::std::option::Option::None
                }
            } else {
                ::std::option::Option::None
            };
            ws_trigger_event(raw_cx, info.realm_global, &info.js_obj_key, "onerror", data);
            ws_trigger_event(raw_cx, info.realm_global, &info.js_obj_key, "onclose", None);
            gc_store_remove(raw_cx, &info.js_obj_key);
        }
    }
}

/// Inbound frame on an open connection: fire onmessage. Text frames arrive
/// as strings; binary frames as an Array of byte values (explicit — binary
/// was previously dropped silently).
///
/// # Safety
/// `raw_cx` must be a live JSContext on the current thread.
unsafe fn ws_message_dispatch(
    raw_cx: *mut JSContext,
    idx: usize,
    text: ::std::option::Option<String>,
    binary: ::std::option::Option<Vec<u8>>,
) {
    let info = match ws_entry_info(idx) {
        Some(i) => i,
        None => return,
    };
    if !info.is_open {
        return;
    }
    if info.realm_global.is_null() {
        return;
    }
    // Enter the realm BEFORE any JS value creation — JS_NewStringCopyZ /
    // JS_NewUint8Array allocate in the current zone, and the drain pump runs
    // with no realm entered (invalid zone → SIGSEGV in the allocator).
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(raw_cx));
    let cx_ref = &mut wrapped_cx;
    rooted!(&in(cx_ref) let global_root = info.realm_global);
    let mut realm = AutoRealm::new_from_handle(cx_ref, global_root.handle());
    let cx_ref: &mut mozjs::context::JSContext = &mut realm;
    let data = if let ::std::option::Option::Some(t) = text {
        let c_text = ZBox::from_bytes(t.as_bytes());
        let js_str = JS_NewStringCopyZ(raw_cx, c_text.as_ptr());
        if js_str.is_null() {
            return;
        }
        StringValue(&*js_str)
    } else if let ::std::option::Option::Some(bytes) = binary {
        let arr = mozjs_sys::jsapi::JS_NewUint8Array(raw_cx, bytes.len());
        if arr.is_null() {
            return;
        }
        rooted!(&in(cx_ref) let arr_root = arr);
        if !bytes.is_empty() {
            let mut is_shared = false;
            // SAFETY: same pattern as bun_api.rs — data pointer of the
            // just-created, rooted Uint8Array; copied before any GC point.
            let data_ptr = mozjs_sys::jsapi::JS_GetUint8ArrayData(
                arr_root.get(),
                &mut is_shared,
                ::std::ptr::null(),
            );
            if !data_ptr.is_null() {
                ::std::ptr::copy_nonoverlapping(bytes.as_ptr(), data_ptr, bytes.len());
            }
        }
        ObjectValue(arr_root.get())
    } else {
        return;
    };
    ws_trigger_event(
        raw_cx,
        info.realm_global,
        &info.js_obj_key,
        "onmessage",
        ::std::option::Option::Some(data),
    );
}

/// Connection is dead (close handshake finished or transport error): CLOSED +
/// onclose (+ onerror first for a transport error). Terminal cleanup of the
/// GcStore root.
///
/// # Safety
/// `raw_cx` must be a live JSContext on the current thread.
unsafe fn ws_closed_dispatch(
    raw_cx: *mut JSContext,
    idx: usize,
    err: ::std::option::Option<String>,
) {
    let info = match ws_entry_info(idx) {
        Some(i) => i,
        None => return,
    };
    ws_set_ready_state(raw_cx, info.realm_global, &info.js_obj_key, 3);
    if let ::std::option::Option::Some(msg) = err {
        // Enter the realm before creating the error string (valid zone for
        // allocation — the pump runs with no realm entered).
        let data = if !info.realm_global.is_null() {
            let mut wrapped_cx =
                mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(raw_cx));
            let cx_ref = &mut wrapped_cx;
            rooted!(&in(cx_ref) let global_root = info.realm_global);
            let mut realm = AutoRealm::new_from_handle(cx_ref, global_root.handle());
            let _cx_in_realm: &mut mozjs::context::JSContext = &mut realm;
            let c_msg = ZBox::from_bytes(msg.as_bytes());
            let js_str = JS_NewStringCopyZ(raw_cx, c_msg.as_ptr());
            if !js_str.is_null() {
                ::std::option::Option::Some(StringValue(&*js_str))
            } else {
                ::std::option::Option::None
            }
        } else {
            ::std::option::Option::None
        };
        ws_trigger_event(raw_cx, info.realm_global, &info.js_obj_key, "onerror", data);
    }
    ws_trigger_event(raw_cx, info.realm_global, &info.js_obj_key, "onclose", None);
    gc_store_remove(raw_cx, &info.js_obj_key);
}

// ── Performance ──

pub fn install_performance(
    cx: &mut mozjs::context::JSContext,
    global: mozjs::rust::Handle<*mut JSObject>,
) {
    unsafe {
        rooted!(&in(cx) let perf_obj = JS_NewPlainObject(cx));
        if perf_obj.get().is_null() {
            return;
        }
        JS_DefineFunction(
            cx,
            perf_obj.handle(),
            c"now".as_ptr(),
            Some(performance_now),
            0,
            JSPROP_ENUMERATE as u32,
        );
        JS_DefineProperty3(
            cx,
            global,
            c"performance".as_ptr(),
            perf_obj.handle(),
            JSPROP_ENUMERATE as u32,
        );
    }
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn performance_now(_cx: *mut JSContext, _argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, _argc);
    let now = ::std::time::SystemTime::now()
        .duration_since(::std::time::UNIX_EPOCH)
        .unwrap_or_default();
    let ms = now.as_secs_f64() * 1000.0;
    args.rval().set(mozjs::jsval::DoubleValue(ms));
    true
}

// ── TextEncoder / TextDecoder ──

pub fn install_web_encodings(
    cx: &mut mozjs::context::JSContext,
    global: mozjs::rust::Handle<*mut JSObject>,
) {
    unsafe {
        let te_fun = JS_NewFunction(
            cx.raw_cx(),
            Some(text_encoder_constructor),
            0,
            JSFUN_CONSTRUCTOR,
            c"TextEncoder".as_ptr(),
        );
        if !te_fun.is_null() {
            let te_obj = JS_GetFunctionObject(te_fun);
            if !te_obj.is_null() {
                rooted!(&in(cx) let te_obj_r = te_obj);
                rooted!(&in(cx) let proto = JS_NewPlainObject(cx));
                if !proto.get().is_null() {
                    JS_DefineFunction(
                        cx,
                        proto.handle(),
                        c"encode".as_ptr(),
                        Some(text_encoder_encode),
                        1,
                        JSPROP_ENUMERATE as u32,
                    );
                    JS_DefineFunction(
                        cx,
                        proto.handle(),
                        c"encodeInto".as_ptr(),
                        Some(text_encoder_encode_into),
                        2,
                        JSPROP_ENUMERATE as u32,
                    );
                    JS_DefineProperty3(
                        cx,
                        te_obj_r.handle(),
                        c"prototype".as_ptr(),
                        proto.handle(),
                        JSPROP_PERMANENT as u32,
                    );
                }
                JS_DefineProperty3(
                    cx,
                    global,
                    c"TextEncoder".as_ptr(),
                    te_obj_r.handle(),
                    (JSPROP_ENUMERATE | JSPROP_PERMANENT) as u32,
                );
            }
        }

        let td_fun = JS_NewFunction(
            cx.raw_cx(),
            Some(text_decoder_constructor),
            1,
            JSFUN_CONSTRUCTOR,
            c"TextDecoder".as_ptr(),
        );
        if !td_fun.is_null() {
            let td_obj = JS_GetFunctionObject(td_fun);
            if !td_obj.is_null() {
                rooted!(&in(cx) let td_obj_r = td_obj);
                rooted!(&in(cx) let proto = JS_NewPlainObject(cx));
                if !proto.get().is_null() {
                    JS_DefineFunction(
                        cx,
                        proto.handle(),
                        c"decode".as_ptr(),
                        Some(text_decoder_decode),
                        1,
                        JSPROP_ENUMERATE as u32,
                    );
                    JS_DefineProperty3(
                        cx,
                        td_obj_r.handle(),
                        c"prototype".as_ptr(),
                        proto.handle(),
                        JSPROP_PERMANENT as u32,
                    );
                }
                JS_DefineProperty3(
                    cx,
                    global,
                    c"TextDecoder".as_ptr(),
                    td_obj_r.handle(),
                    (JSPROP_ENUMERATE | JSPROP_PERMANENT) as u32,
                );
            }
        }
    }
}

pub fn install_atob_btoa(
    cx: &mut mozjs::context::JSContext,
    global: mozjs::rust::Handle<*mut JSObject>,
) {
    unsafe {
        JS_DefineFunction(
            cx,
            global,
            c"atob".as_ptr(),
            Some(atob_fn),
            1,
            JSPROP_ENUMERATE as u32,
        );
        JS_DefineFunction(
            cx,
            global,
            c"btoa".as_ptr(),
            Some(btoa_fn),
            1,
            JSPROP_ENUMERATE as u32,
        );
    }
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn atob_fn(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    if argc == 0 || !(*args.get(0).ptr).is_string() {
        args.rval().set(UndefinedValue());
        return true;
    }
    let s = unsafe_jsstr_to_string(
        cx,
        ::std::ptr::NonNull::new_unchecked((*args.get(0).ptr).to_string()),
    );
    // HTML spec forgivable-base64 decode preamble (mirrors servo
    // base64_atob): strip HTML space, drop trailing padding on a %4==0
    // input, reject len%4==1, reject non-alphabet characters.
    let is_html_space = |c: char| matches!(c, ' ' | '\t' | '\n' | '\r' | '\x0C');
    let cleaned: String = s.chars().filter(|&c| !is_html_space(c)).collect();
    let mut input: &str = &cleaned;
    if input.len() % 4 == 0 {
        if input.ends_with("==") {
            input = &input[..input.len() - 2];
        } else if input.ends_with('=') {
            input = &input[..input.len() - 1];
        }
    }
    if input.len() % 4 == 1 || input.chars().any(|c| !c.is_ascii_alphanumeric() && c != '+' && c != '/')
    {
        JS_ReportErrorUTF8(
            cx,
            c"Failed to decode base64: InvalidCharacterError".as_ptr(),
        );
        return false;
    }
    match bun_base64::decode_alloc(input.as_bytes()) {
        Ok(bytes) => {
            // BCE (atob binary truncation, 2026-08-18): two stacked defects
            // made any NUL-bearing payload truncate to its first zero byte
            // (a 117k-char WAV base64 decoded to 8-9 bytes — "RIFF" plus a
            // couple of size-field bytes, cut at the 0x00s):
            //   1. `String::from_utf8_lossy(&bytes)` treated raw binary as
            //      UTF-8, corrupting every non-ASCII byte into U+FFFD.
            //   2. `JS_NewStringCopyZ` copies up to the first NUL.
            // HTML spec / servo's own base64_atob semantics: each decoded
            // octet maps to ONE code unit (latin-1) — same contract as
            // bun_api::js_string_from_child_bytes. Copy via explicit-length
            // JS_NewUCStringCopyN so 0x00 survives as a plain code unit.
            let units: Vec<u16> = bytes.iter().map(|&b| b as u16).collect();
            let js_str = if units.is_empty() {
                JS_NewStringCopyN(cx, c"".as_ptr(), 0)
            } else {
                JS_NewUCStringCopyN(cx, units.as_ptr(), units.len())
            };
            if js_str.is_null() {
                args.rval().set(UndefinedValue());
            } else {
                args.rval().set(StringValue(&*js_str));
            }
        }
        Err(_) => {
            JS_ReportErrorUTF8(
                cx,
                c"Failed to decode base64: InvalidCharacterError".as_ptr(),
            );
            return false;
        }
    }
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn btoa_fn(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    if argc == 0 || !(*args.get(0).ptr).is_string() {
        args.rval().set(UndefinedValue());
        return true;
    }
    // BCE (btoa latin1 corruption, found by the atob round-trip regression):
    // the input's UTF-8 bytes used to be encoded directly, so a code unit
    // like 0xE0 encoded as the TWO bytes C0 A0 instead of the single octet
    // E0 — every >0x7F character corrupted the encoding. HTML spec / servo
    // base64_btoa: throw InvalidCharacterError on any code point > U+00FF;
    // otherwise each code point encodes as ONE octet. `chars()` iterates
    // code points (== code units for the ≤0xFF domain we keep here).
    let s = unsafe_jsstr_to_string(
        cx,
        ::std::ptr::NonNull::new_unchecked((*args.get(0).ptr).to_string()),
    );
    if s.chars().any(|c| c > '\u{FF}') {
        JS_ReportErrorUTF8(
            cx,
            c"Failed to encode base64: InvalidCharacterError".as_ptr(),
        );
        return false;
    }
    let octets: Vec<u8> = s.chars().map(|c| c as u8).collect();
    let encoded_bytes = bun_base64::encode_alloc(&octets);
    let encoded = ::std::str::from_utf8(&encoded_bytes).unwrap_or("");
    let c_str = ZBox::from_bytes(encoded.as_bytes());
    let js_str = JS_NewStringCopyZ(cx, c_str.as_ptr());
    if js_str.is_null() {
        args.rval().set(UndefinedValue());
    } else {
        args.rval().set(StringValue(&*js_str));
    }
    true
}

pub fn install_queue_microtask(
    cx: &mut mozjs::context::JSContext,
    global: mozjs::rust::Handle<*mut JSObject>,
) {
    unsafe {
        JS_DefineFunction(
            cx,
            global,
            c"queueMicrotask".as_ptr(),
            Some(queue_microtask_fn),
            1,
            JSPROP_ENUMERATE as u32,
        );
    }
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn text_encoder_constructor(
    cx: *mut JSContext,
    argc: u32,
    vp: *mut JSVal,
) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    let obj = mozjs_sys::jsapi::JS_NewPlainObject(cx);
    if obj.is_null() {
        args.rval().set(UndefinedValue());
        return true;
    }
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    rooted!(&in(wrapped_cx) let obj_r = obj);
    let encoding_str = JS_NewStringCopyZ(cx, c"utf-8".as_ptr());
    if !encoding_str.is_null() {
        let val = StringValue(&*encoding_str);
        rooted!(&in(wrapped_cx) let val_root = val);
        JS_DefineProperty(
            cx,
            obj_r.handle().into(),
            c"encoding".as_ptr(),
            val_root.handle().into(),
            (JSPROP_ENUMERATE | JSPROP_READONLY) as u32,
        );
    }

    JS_DefineFunction(
        &mut wrapped_cx,
        obj_r.handle(),
        c"encode".as_ptr(),
        Some(text_encoder_encode),
        1,
        JSPROP_ENUMERATE as u32,
    );
    JS_DefineFunction(
        &mut wrapped_cx,
        obj_r.handle(),
        c"encodeInto".as_ptr(),
        Some(text_encoder_encode_into),
        2,
        JSPROP_ENUMERATE as u32,
    );

    args.rval().set(ObjectValue(obj));
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn text_encoder_encode(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    let input = if argc > 0 {
        let v = *args.get(0).ptr;
        if v.is_string() {
            crate::js_to_rust_string(cx, v)
        } else {
            String::new()
        }
    } else {
        String::new()
    };

    let bytes = input.as_bytes();
    let wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));

    // @trace REQ-ENG-005 [api:TextEncoder.encode] — Return a real SM
    // Uint8Array (not a plain Array) so callers see .byteLength/.buffer and
    // pass `instanceof Uint8Array`. Buffer.test.js drives this via
    // `new TextEncoder().encode(str).byteLength`.
    let u8_obj = mozjs_sys::jsapi::JS_NewUint8Array(cx, bytes.len());
    if u8_obj.is_null() {
        args.rval().set(UndefinedValue());
        return true;
    }
    if !bytes.is_empty() {
        rooted!(&in(wrapped_cx) let arr = u8_obj);
        let mut is_shared = false;
        let data_ptr =
            mozjs_sys::jsapi::JS_GetUint8ArrayData(arr.get(), &mut is_shared, ::std::ptr::null());
        if !data_ptr.is_null() {
            ::std::ptr::copy_nonoverlapping(bytes.as_ptr(), data_ptr, bytes.len());
        }
        args.rval().set(ObjectValue(arr.get()));
    } else {
        args.rval().set(ObjectValue(u8_obj));
    }
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn text_encoder_encode_into(
    _cx: *mut JSContext,
    _argc: u32,
    vp: *mut JSVal,
) -> bool {
    let args = CallArgs::from_vp(vp, _argc);
    args.rval().set(UndefinedValue());
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn text_decoder_constructor(
    cx: *mut JSContext,
    argc: u32,
    vp: *mut JSVal,
) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    let obj = mozjs_sys::jsapi::JS_NewPlainObject(cx);
    if obj.is_null() {
        args.rval().set(UndefinedValue());
        return true;
    }
    let encoding = if argc > 0 {
        let v = *args.get(0).ptr;
        if v.is_string() {
            crate::js_to_rust_string(cx, v)
        } else {
            "utf-8".to_string()
        }
    } else {
        "utf-8".to_string()
    };
    let encoding_lower = encoding.to_lowercase();
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    rooted!(&in(wrapped_cx) let obj_r = obj);
    let encoding_str = JS_NewStringCopyZ(cx, ZBox::from_bytes(encoding_lower.as_bytes()).as_ptr());
    if !encoding_str.is_null() {
        let val = StringValue(&*encoding_str);
        rooted!(&in(wrapped_cx) let val_root = val);
        JS_DefineProperty(
            cx,
            obj_r.handle().into(),
            c"encoding".as_ptr(),
            val_root.handle().into(),
            (JSPROP_ENUMERATE | JSPROP_READONLY) as u32,
        );
    }
    rooted!(&in(wrapped_cx) let fatal_val = BooleanValue(false));
    JS_DefineProperty(
        cx,
        obj_r.handle().into(),
        c"fatal".as_ptr(),
        fatal_val.handle().into(),
        (JSPROP_ENUMERATE | JSPROP_READONLY) as u32,
    );
    rooted!(&in(wrapped_cx) let bom_val = BooleanValue(false));
    JS_DefineProperty(
        cx,
        obj_r.handle().into(),
        c"ignoreBOM".as_ptr(),
        bom_val.handle().into(),
        (JSPROP_ENUMERATE | JSPROP_READONLY) as u32,
    );

    JS_DefineFunction(
        &mut wrapped_cx,
        obj_r.handle(),
        c"decode".as_ptr(),
        Some(text_decoder_decode),
        1,
        JSPROP_ENUMERATE as u32,
    );

    args.rval().set(ObjectValue(obj));
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn text_decoder_decode(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    if argc == 0 {
        let empty = JS_NewStringCopyZ(cx, c"".as_ptr());
        args.rval().set(if empty.is_null() {
            UndefinedValue()
        } else {
            StringValue(&*empty)
        });
        return true;
    }

    let input = *args.get(0).ptr;
    // Primitive input (number/string/null) is not a BufferSource — spec
    // TypeError. Guard BEFORE to_object(): to_object() on a non-object
    // asserts.
    if !input.is_object() {
        mozjs::error::throw_type_error(
            cx,
            c"The provided value is not an instance of ArrayBuffer or ArrayBufferView".as_ref(),
        );
        return false;
    }

    // WHATWG BufferSource extraction: ArrayBufferView (Uint8Array & every
    // other view, byteOffset-adjusted) OR ArrayBuffer. Both take the direct
    // data-pointer path — the previous generic length+GetElement loop read
    // view ELEMENTS one by one and produced "" for a bare ArrayBuffer (it
    // has no `length` property). Anything that is not a BufferSource is a
    // TypeError per spec (decode() with no args returns "" above).
    let bytes: Vec<u8> = {
        let wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
        rooted!(&in(wrapped_cx) let obj = input.to_object());
        let mut len: usize = 0;
        let mut is_shared = false;
        let mut data: *mut u8 = ::std::ptr::null_mut();
        let unwrapped =
            mozjs_sys::jsapi::JS_GetObjectAsArrayBufferView(obj.get(), &mut len, &mut is_shared, &mut data);
        if !unwrapped.is_null() && !data.is_null() {
            // Detached views surface as length 0 + null data (handled below);
            // a live view yields the byteOffset-adjusted pointer directly.
            ::std::slice::from_raw_parts(data, len).to_vec()
        } else if !unwrapped.is_null() {
            Vec::new() // detached view: empty byte sequence per spec
        } else {
            let ab_unwrapped =
                mozjs_sys::jsapi::JS::GetObjectAsArrayBuffer(obj.get(), &mut len, &mut data);
            if !ab_unwrapped.is_null() && !data.is_null() {
                ::std::slice::from_raw_parts(data, len).to_vec()
            } else if !ab_unwrapped.is_null() {
                Vec::new() // detached ArrayBuffer
            } else {
                mozjs::error::throw_type_error(
                    cx,
                    c"The provided value is not an instance of ArrayBuffer or ArrayBufferView"
                        .as_ref(),
                );
                return false;
            }
        }
    };

    // TextDecoder defaults to fatal:false — invalid sequences become U+FFFD
    // replacement characters instead of throwing.
    let decoded = String::from_utf8_lossy(&bytes).into_owned();

    let utf16: Vec<u16> = decoded.encode_utf16().collect();
    let js_str = JS_NewUCStringCopyN(cx, utf16.as_ptr(), utf16.len());
    args.rval().set(if js_str.is_null() {
        UndefinedValue()
    } else {
        StringValue(&*js_str)
    });
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn queue_microtask_fn(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    if argc == 0 || !(*args.get(0).ptr).is_object() {
        return true;
    }
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx = &mut wrapped_cx;

    rooted!(&in(cx) let callback = (*args.get(0).ptr).to_object());
    rooted!(&in(cx) let undef_val = UndefinedValue());
    let resolved = CallOriginalPromiseResolve(cx, undef_val.handle());
    if resolved.is_null() {
        args.rval().set(UndefinedValue());
        return true;
    }
    rooted!(&in(cx) let promise = resolved);
    rooted!(&in(cx) let null_reject = ::std::ptr::null_mut::<JSObject>());
    CallOriginalPromiseThen(
        cx,
        promise.handle(),
        callback.handle(),
        null_reject.handle(),
    );
    args.rval().set(UndefinedValue());
    true
}

// ═══════════════════════════════════════════════════════════════════════════
// crypto.subtle — WebCrypto surface bridged onto the REAL primitives the
// node:crypto layer already uses (bao_crypto + bun_sha_hmac + bun_base64).
// @trace REQ-ENG-006 [api:crypto.subtle]
//
// The subtle object is the SAME object globals::install_crypto_global put on
// globalThis.crypto (so require("crypto").subtle — aliased by node_crypto —
// upgrades with it). Installed at the tail of the web-API phase; defining the
// methods on the existing object preserves every alias.
// ═══════════════════════════════════════════════════════════════════════════

/// Define the full WebCrypto method set on globalThis.crypto.subtle.
pub fn install_crypto_subtle(cx: &mut mozjs::context::JSContext, global: mozjs::rust::Handle<*mut JSObject>) {
    unsafe {
        rooted!(&in(cx) let global_root = global.get());
        let mut crypto_val = UndefinedValue();
        // BCE (P0 browser startup panic, servo error.rs:74): a capability
        // probe that hits a throwing getter returns false WITH the exception
        // pending; an unconsumed pending exception detonates servo's
        // `assert!(!JS_IsExceptionPending)` in `throw_dom_exception` on the
        // next error path, killing the ScriptThread at page init. Read as
        // "not available" and consume the exception.
        let crypto_found = JS_GetProperty(
            cx.raw_cx(),
            global_root.handle().into(),
            c"crypto".as_ptr(),
            MutableHandle::<Value> {
                _phantom_0: ::std::marker::PhantomData,
                ptr: &mut crypto_val,
            },
        );
        if !crypto_found {
            JS_ClearPendingException(cx.raw_cx());
            return;
        }
        if !crypto_val.is_object() {
            return;
        }
        rooted!(&in(cx) let crypto_obj = crypto_val.to_object());
        let mut subtle_val = UndefinedValue();
        // BCE (error.rs:74): same probe contract as `crypto` above.
        let subtle_found = JS_GetProperty(
            cx.raw_cx(),
            crypto_obj.handle().into(),
            c"subtle".as_ptr(),
            MutableHandle::<Value> {
                _phantom_0: ::std::marker::PhantomData,
                ptr: &mut subtle_val,
            },
        );
        if !subtle_found {
            JS_ClearPendingException(cx.raw_cx());
            return;
        }
        if !subtle_val.is_object() {
            return;
        }
        rooted!(&in(cx) let subtle = subtle_val.to_object());
        for (name, op, nargs) in [
            ("encrypt", subtle_encrypt as unsafe extern "C" fn(*mut JSContext, u32, *mut JSVal) -> bool, 3),
            ("decrypt", subtle_decrypt, 3),
            ("generateKey", subtle_generate_key, 3),
            ("importKey", subtle_import_key, 5),
            ("sign", subtle_sign, 3),
            ("verify", subtle_verify, 4),
            // digest: the pre-existing globals.rs implementation returned the
            // raw bytes instead of a Promise (spec violation — every
            // `subtle.digest().then` threw). Redefined here on the SAME subtle
            // object with Promise semantics over the real BoringSSL hashers.
            ("digest", subtle_digest, 2),
        ] {
            JS_DefineFunction(
                cx,
                subtle.handle(),
                ZBox::from_bytes(name.as_bytes()).as_ptr(),
                Some(op),
                nargs,
                JSPROP_ENUMERATE as u32,
            );
        }
    }
}

// ── subtle helpers ──────────────────────────────────────────────────────────

/// Constant-time byte equality (signature verification must not leak).
fn ct_eq(a: &[u8], b: &[u8]) -> bool {
    if a.len() != b.len() {
        return false;
    }
    let mut diff: u8 = 0;
    for (x, y) in a.iter().zip(b.iter()) {
        diff |= x ^ y;
    }
    diff == 0
}

/// Extract BufferSource bytes: TypedArray/DataView fast path, then BARE
/// ArrayBuffer (subtle results are bare ArrayBuffers — the node_crypto
/// extractor misses those), then empty.
#[allow(unsafe_op_in_unsafe_fn)]
unsafe fn subtle_bytes(cx: *mut JSContext, val: JSVal) -> Vec<u8> {
    if !val.is_object() {
        return Vec::new();
    }
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    rooted!(&in(cx_ref) let obj_root = val.to_object());
    let mut length: usize = 0;
    let mut is_shared = false;
    let mut data_ptr: *mut u8 = ::std::ptr::null_mut();
    let u8_unwrapped = mozjs_sys::jsapi::JS_GetObjectAsUint8Array(
        obj_root.get(),
        &mut length,
        &mut is_shared,
        &mut data_ptr,
    );
    if !u8_unwrapped.is_null() && !data_ptr.is_null() && length > 0 {
        return ::std::slice::from_raw_parts(data_ptr, length).to_vec();
    }
    let mut view_length: usize = 0;
    let mut view_shared = false;
    let mut view_data: *mut u8 = ::std::ptr::null_mut();
    let view_unwrapped = mozjs_sys::jsapi::JS_GetObjectAsArrayBufferView(
        obj_root.get(),
        &mut view_length,
        &mut view_shared,
        &mut view_data,
    );
    if !view_unwrapped.is_null() && !view_data.is_null() && view_length > 0 {
        return ::std::slice::from_raw_parts(view_data, view_length).to_vec();
    }
    // Bare ArrayBuffer (length via ByteLength; data ptr valid while rooted,
    // copied before any further JSAPI call).
    let ab_len = mozjs_sys::jsapi::JS::GetArrayBufferByteLength(obj_root.get());
    if ab_len > 0 {
        let mut ab_shared = false;
        let ab_data = mozjs_sys::jsapi::JS::GetArrayBufferData(
            obj_root.get(),
            &mut ab_shared,
            ::std::ptr::null(),
        );
        if !ab_data.is_null() {
            return ::std::slice::from_raw_parts(ab_data, ab_len).to_vec();
        }
    }
    Vec::new()
}

/// Read a string-valued property off a JS object.
#[allow(unsafe_op_in_unsafe_fn)]
unsafe fn subtle_str_prop(cx: *mut JSContext, obj: *mut JSObject, name: &str) -> Option<String> {
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    rooted!(&in(cx_ref) let obj_r = obj);
    let c_name = ZBox::from_bytes(name.as_bytes());
    let mut v = UndefinedValue();
    // BCE (error.rs:74): caller-supplied algorithm objects can carry
    // throwing getters; a failed probe must consume its pending exception
    // (browser mode runs this on the servo ScriptThread context).
    bao_stealth::engine_props::get_property_clearing(cx, obj_r.handle().into(), c_name.as_cstr(), &mut v);
    if v.is_string() {
        Some(crate::js_to_rust_string(cx, v))
    } else {
        None
    }
}

/// Read a numeric property as u32.
#[allow(unsafe_op_in_unsafe_fn)]
unsafe fn subtle_u32_prop(cx: *mut JSContext, obj: *mut JSObject, name: &str) -> Option<u32> {
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    rooted!(&in(cx_ref) let obj_r = obj);
    let c_name = ZBox::from_bytes(name.as_bytes());
    let mut v = UndefinedValue();
    // BCE (error.rs:74): clearing probe — see subtle_str_prop.
    bao_stealth::engine_props::get_property_clearing(cx, obj_r.handle().into(), c_name.as_cstr(), &mut v);
    if v.is_int32() && v.to_int32() >= 0 {
        Some(v.to_int32() as u32)
    } else if v.is_double() && v.to_double() >= 0.0 {
        Some(v.to_double() as u32)
    } else {
        None
    }
}

/// Read a BufferSource-valued property (iv / additionalData / data).
#[allow(unsafe_op_in_unsafe_fn)]
unsafe fn subtle_bytes_prop(cx: *mut JSContext, obj: *mut JSObject, name: &str) -> Option<Vec<u8>> {
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    rooted!(&in(cx_ref) let obj_r = obj);
    let c_name = ZBox::from_bytes(name.as_bytes());
    let mut v = UndefinedValue();
    // BCE (error.rs:74): clearing probe — see subtle_str_prop.
    bao_stealth::engine_props::get_property_clearing(cx, obj_r.handle().into(), c_name.as_cstr(), &mut v);
    if v.is_object() {
        Some(subtle_bytes(cx, v))
    } else {
        None
    }
}

/// Copy bytes into a fresh ArrayBuffer value.
#[allow(unsafe_op_in_unsafe_fn)]
unsafe fn bytes_to_arraybuffer_val(cx: *mut JSContext, bytes: &[u8]) -> JSVal {
    // glue::NewArrayBufferWithContents takes ownership of a malloc'd buffer
    // (JS frees it) — copy into a fresh malloc block, zero-copy from there.
    if bytes.is_empty() {
        let ab = mozjs_sys::jsapi::JS::NewArrayBuffer(cx, 0);
        return if ab.is_null() { UndefinedValue() } else { ObjectValue(ab) };
    }
    let buf = libc::malloc(bytes.len()) as *mut u8;
    if buf.is_null() {
        return UndefinedValue();
    }
    ::std::ptr::copy_nonoverlapping(bytes.as_ptr(), buf, bytes.len());
    let ab = mozjs_sys::jsapi::glue::NewArrayBufferWithContents(cx, bytes.len(), buf as *mut core::ffi::c_void);
    if ab.is_null() {
        libc::free(buf as *mut core::ffi::c_void);
        return UndefinedValue();
    }
    ObjectValue(ab)
}

/// Build a CryptoKey JS object. `material` names the hidden bytes slot:
/// `_raw` for symmetric keys, `_der` (pkcs8 for private, spki for public)
/// for asymmetric.
#[allow(unsafe_op_in_unsafe_fn)]
unsafe fn make_crypto_key(
    cx: *mut JSContext,
    ktype: &str,
    alg_name: &str,
    extra_alg: &[(&str, String)],
    extractable: bool,
    usages: *mut JSObject,
    material_slot: &str,
    material: &[u8],
) -> *mut JSObject {
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    rooted!(&in(cx_ref) let key = JS_NewPlainObject(cx_ref));
    if key.get().is_null() {
        return ::std::ptr::null_mut();
    }
    let kh = key.handle().into();

    let c_t = ZBox::from_bytes(ktype.as_bytes());
    let t_js = JS_NewStringCopyZ(cx, c_t.as_ptr());
    if !t_js.is_null() {
        rooted!(&in(cx_ref) let tv = StringValue(&*t_js));
        JS_DefineProperty(cx, kh, c"type".as_ptr(), tv.handle().into(), (JSPROP_ENUMERATE | JSPROP_READONLY) as u32);
    }
    rooted!(&in(cx_ref) let ev = BooleanValue(extractable));
    JS_DefineProperty(cx, kh, c"extractable".as_ptr(), ev.handle().into(), (JSPROP_ENUMERATE | JSPROP_READONLY) as u32);
    rooted!(&in(cx_ref) let uv = ObjectValue(usages));
    JS_DefineProperty(cx, kh, c"usages".as_ptr(), uv.handle().into(), (JSPROP_ENUMERATE | JSPROP_READONLY) as u32);

    // algorithm: { name, ...extras }
    rooted!(&in(cx_ref) let alg_obj = JS_NewPlainObject(cx_ref));
    if !alg_obj.get().is_null() {
        let ah = alg_obj.handle().into();
        let c_n = ZBox::from_bytes(alg_name.as_bytes());
        let n_js = JS_NewStringCopyZ(cx, c_n.as_ptr());
        if !n_js.is_null() {
            rooted!(&in(cx_ref) let nv = StringValue(&*n_js));
            JS_DefineProperty(cx, ah, c"name".as_ptr(), nv.handle().into(), (JSPROP_ENUMERATE | JSPROP_READONLY) as u32);
        }
        for (k, v) in extra_alg {
            if *k == "length" {
                // Numeric algorithm member (AES key length) per spec.
                if let Ok(n) = v.parse::<i32>() {
                    rooted!(&in(cx_ref) let nv = Int32Value(n));
                    JS_DefineProperty(
                        cx,
                        ah,
                        ZBox::from_bytes(k.as_bytes()).as_ptr(),
                        nv.handle().into(),
                        (JSPROP_ENUMERATE | JSPROP_READONLY) as u32,
                    );
                }
                continue;
            }
            let c_v = ZBox::from_bytes(v.as_bytes());
            let v_js = JS_NewStringCopyZ(cx, c_v.as_ptr());
            if !v_js.is_null() {
                rooted!(&in(cx_ref) let vv = StringValue(&*v_js));
                JS_DefineProperty(
                    cx,
                    ah,
                    ZBox::from_bytes(k.as_bytes()).as_ptr(),
                    vv.handle().into(),
                    (JSPROP_ENUMERATE | JSPROP_READONLY) as u32,
                );
            }
        }
        rooted!(&in(cx_ref) let av = ObjectValue(alg_obj.get()));
        JS_DefineProperty(cx, kh, c"algorithm".as_ptr(), av.handle().into(), (JSPROP_ENUMERATE | JSPROP_READONLY) as u32);
    }

    // Hidden material slots (Uint8Array over copied bytes).
    let stash = |slot: &str, bytes: &[u8]| {
        let u8v = mozjs_sys::jsapi::JS_NewUint8Array(cx, bytes.len());
        if u8v.is_null() {
            return;
        }
        let mut len: usize = 0;
        let mut shared = false;
        let mut data: *mut u8 = ::std::ptr::null_mut();
        let unwrapped = mozjs_sys::jsapi::JS_GetObjectAsUint8Array(u8v, &mut len, &mut shared, &mut data);
        if unwrapped.is_null() || data.is_null() || len < bytes.len() {
            return;
        }
        ::std::ptr::copy_nonoverlapping(bytes.as_ptr(), data, bytes.len());
        rooted!(&in(cx_ref) let mv = ObjectValue(u8v));
        JS_DefineProperty(
            cx,
            kh,
            ZBox::from_bytes(slot.as_bytes()).as_ptr(),
            mv.handle().into(),
            0,
        );
    };
    stash(material_slot, material);
    key.get()
}

/// Build the WebCrypto CryptoKeyPair `{ privateKey, publicKey }` that
/// generateKey resolves with for asymmetric algorithms. Each half carries
/// its own `_der` material: pkcs8 on the private key, spki on the public.
#[allow(unsafe_op_in_unsafe_fn)]
unsafe fn make_crypto_key_pair(
    cx: *mut JSContext,
    alg_name: &str,
    extra_alg: &[(&str, String)],
    extractable: bool,
    usages: *mut JSObject,
    private_der: &[u8],
    public_der: &[u8],
) -> *mut JSObject {
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    rooted!(&in(cx_ref) let pair = JS_NewPlainObject(cx_ref));
    if pair.get().is_null() {
        return ::std::ptr::null_mut();
    }
    let ph = pair.handle().into();
    let private_key = make_crypto_key(cx, "private", alg_name, extra_alg, extractable, usages, "_der", private_der);
    let public_key = make_crypto_key(cx, "public", alg_name, extra_alg, extractable, usages, "_der", public_der);
    if private_key.is_null() || public_key.is_null() {
        return ::std::ptr::null_mut();
    }
    rooted!(&in(cx_ref) let pv = ObjectValue(private_key));
    JS_DefineProperty(cx, ph, c"privateKey".as_ptr(), pv.handle().into(), (JSPROP_ENUMERATE | JSPROP_READONLY) as u32);
    rooted!(&in(cx_ref) let uv = ObjectValue(public_key));
    JS_DefineProperty(cx, ph, c"publicKey".as_ptr(), uv.handle().into(), (JSPROP_ENUMERATE | JSPROP_READONLY) as u32);
    pair.get()
}

/// Caller-supplied JSVal coerced to an object — None on non-object input
/// (a rejected promise) instead of the JSVal::to_object debug assert abort
/// that a stray `undefined` key argument used to trigger.
unsafe fn subtle_arg_object(val: JSVal) -> Option<*mut JSObject> {
    if val.is_object() {
        Some(val.to_object())
    } else {
        None
    }
}

/// Read a hidden bytes slot off a CryptoKey.
#[allow(unsafe_op_in_unsafe_fn)]
unsafe fn key_material(cx: *mut JSContext, key: *mut JSObject, slot: &str) -> Option<Vec<u8>> {
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    rooted!(&in(cx_ref) let key_r = key);
    let mut v = UndefinedValue();
    JS_GetProperty(
        cx,
        key_r.handle().into(),
        ZBox::from_bytes(slot.as_bytes()).as_ptr(),
        MutableHandle::<Value> {
            _phantom_0: ::std::marker::PhantomData,
            ptr: &mut v,
        },
    );
    if v.is_object() {
        Some(subtle_bytes(cx, v))
    } else {
        None
    }
}

/// Fresh pending Promise, set as the method's rval. Expands to a block
/// evaluating to the rooted promise object (null on allocation failure).
macro_rules! subtle_promise {
    ($cx:expr, $cx_ref:expr, $args:expr) => {{
        rooted!(&in($cx_ref) let null_global = ::std::ptr::null_mut::<JSObject>());
        let promise = mozjs_sys::jsapi::JS::NewPromiseObject($cx, null_global.handle().into());
        if promise.is_null() {
            $args.rval().set(UndefinedValue());
            ::std::ptr::null_mut::<JSObject>()
        } else {
            $args.rval().set(ObjectValue(promise));
            promise
        }
    }};
}

// ── subtle.digest (Promise-returning redefinition over real hashers) ───────

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn subtle_digest(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    let promise = subtle_promise!(cx, cx_ref, &args);
    if promise.is_null() {
        return true;
    }
    rooted!(&in(cx_ref) let promise_root = promise);

    let result: ::std::result::Result<Vec<u8>, String> = (|| {
        use bun_sha_hmac::sha::hashers;
        if argc < 2 {
            return Err("digest(algorithm, data) requires 2 arguments".to_string());
        }
        let alg_val = *args.get(0).ptr;
        let name = if alg_val.is_string() {
            crate::js_to_rust_string(cx, alg_val).to_uppercase()
        } else if alg_val.is_object() {
            let obj = alg_val.to_object();
            subtle_str_prop(cx, obj, "name").unwrap_or_default().to_uppercase()
        } else {
            return Err("digest algorithm must be a string or {name}".to_string());
        };
        let data = subtle_bytes(cx, *args.get(1).ptr);
        match name.as_str() {
            "SHA-1" | "SHA1" => {
                let mut out = [0u8; hashers::SHA1::DIGEST];
                hashers::SHA1::hash(&data, &mut out);
                Ok(out.to_vec())
            }
            "SHA-256" | "SHA256" => {
                let mut out = [0u8; hashers::SHA256::DIGEST];
                hashers::SHA256::hash(&data, &mut out);
                Ok(out.to_vec())
            }
            "SHA-384" | "SHA384" => {
                let mut out = [0u8; hashers::SHA384::DIGEST];
                hashers::SHA384::hash(&data, &mut out);
                Ok(out.to_vec())
            }
            "SHA-512" | "SHA512" => {
                let mut out = [0u8; hashers::SHA512::DIGEST];
                hashers::SHA512::hash(&data, &mut out);
                Ok(out.to_vec())
            }
            other => Err(format!("subtle.digest: unsupported algorithm {}", other)),
        }
    })();

    match result {
        Ok(bytes) => {
            let v = bytes_to_arraybuffer_val(cx, &bytes);
            subtle_resolve(cx, promise_root.get(), v);
        }
        Err(msg) => subtle_reject(cx, promise_root.get(), &format!("subtle.digest: {}", msg)),
    }
    true
}

/// Reject the promise with a REAL TypeError from the realm's constructor.
#[allow(unsafe_op_in_unsafe_fn)]
unsafe fn subtle_reject(cx: *mut JSContext, promise: *mut JSObject, msg: &str) {
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    rooted!(&in(cx_ref) let promise_root = promise);
    let global = CurrentGlobalOrNull(cx);
    let err_obj = if !global.is_null() {
        rooted!(&in(cx_ref) let global_root = global);
        let c_msg = ZBox::from_bytes(msg.as_bytes());
        let msg_js = JS_NewStringCopyZ(cx, c_msg.as_ptr());
        let mut err = UndefinedValue();
        if !msg_js.is_null() {
            rooted!(&in(cx_ref) let mv = StringValue(&*msg_js));
            let elems = [*mv.handle()];
            let call_args = HandleValueArray {
                length_: 1,
                elements_: elems.as_ptr(),
            };
            let mut type_error_fn = UndefinedValue();
            JS_GetProperty(
                cx,
                global_root.handle().into(),
                c"TypeError".as_ptr(),
                MutableHandle::<Value> {
                    _phantom_0: ::std::marker::PhantomData,
                    ptr: &mut type_error_fn,
                },
            );
            if type_error_fn.is_object() {
                rooted!(&in(cx_ref) let fn_val = type_error_fn);
                rooted!(&in(cx_ref) let undef_this = ::std::ptr::null_mut::<JSObject>());
                if JS_CallFunctionValue(
                    cx,
                    undef_this.handle().into(),
                    fn_val.handle().into(),
                    &call_args,
                    MutableHandle::<Value> {
                        _phantom_0: ::std::marker::PhantomData,
                        ptr: &mut err,
                    },
                ) && err.is_object() {
                    err.to_object()
                } else {
                    JS_ClearPendingException(cx);
                    ::std::ptr::null_mut()
                }
            } else {
                ::std::ptr::null_mut()
            }
        } else {
            ::std::ptr::null_mut()
        }
    } else {
        ::std::ptr::null_mut()
    };
    if err_obj.is_null() {
        // Degraded shape only when the realm has no TypeError at all — the
        // message still reaches the rejection.
        rooted!(&in(cx_ref) let obj = JS_NewPlainObject(cx_ref));
        if !obj.get().is_null() {
            let c_msg = ZBox::from_bytes(msg.as_bytes());
            let m_js = JS_NewStringCopyZ(cx, c_msg.as_ptr());
            if !m_js.is_null() {
                rooted!(&in(cx_ref) let mv = StringValue(&*m_js));
                JS_DefineProperty(cx, obj.handle().into(), c"message".as_ptr(), mv.handle().into(), JSPROP_ENUMERATE as u32);
            }
            let c_n = ZBox::from_bytes("TypeError".as_bytes());
            let n_js = JS_NewStringCopyZ(cx, c_n.as_ptr());
            if !n_js.is_null() {
                rooted!(&in(cx_ref) let nv = StringValue(&*n_js));
                JS_DefineProperty(cx, obj.handle().into(), c"name".as_ptr(), nv.handle().into(), JSPROP_ENUMERATE as u32);
            }
            rooted!(&in(cx_ref) let ev = ObjectValue(obj.get()));
            mozjs_sys::jsapi::JS::RejectPromise(cx, promise_root.handle().into(), ev.handle().into());
            return;
        }
        return;
    }
    rooted!(&in(cx_ref) let ev = ObjectValue(err_obj));
    mozjs_sys::jsapi::JS::RejectPromise(cx, promise_root.handle().into(), ev.handle().into());
}

/// Resolve the promise with a value.
#[allow(unsafe_op_in_unsafe_fn)]
unsafe fn subtle_resolve(cx: *mut JSContext, promise: *mut JSObject, val: JSVal) {
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    rooted!(&in(cx_ref) let promise_root = promise);
    rooted!(&in(cx_ref) let v = val);
    mozjs_sys::jsapi::JS::ResolvePromise(cx, promise_root.handle().into(), v.handle().into());
}

/// algo.name string from the first argument (algorithm identifier object).
#[allow(unsafe_op_in_unsafe_fn)]
unsafe fn subtle_algo_name(cx: *mut JSContext, val: JSVal) -> ::std::result::Result<(String, *mut JSObject), String> {
    // WebCrypto AlgorithmIdentifier is `(Algorithm or DOMString)`: a bare
    // string like 'HMAC' is the exact equivalent of {name: 'HMAC'} with no
    // extra params (browsers and Node webcrypto both coerce). Synthesize the
    // object so every downstream subtle_*_prop(alg_obj, …) lookup behaves
    // exactly as if the caller passed the object form.
    if val.is_string() {
        let name = crate::js_to_rust_string(cx, val);
        if name.is_empty() {
            return Err("algorithm name is required".to_string());
        }
        let mut wrapped_cx =
            mozjs::context::JSContext::from_ptr(::std::ptr::NonNull::new_unchecked(cx));
        let cx_ref = &mut wrapped_cx;
        let obj = JS_NewPlainObject(cx_ref);
        if obj.is_null() {
            return Err("algorithm object allocation failed".to_string());
        }
        rooted!(&in(cx_ref) let obj_root = obj);
        let js_name = JS_NewStringCopyN(
            cx,
            name.as_ptr() as *const ::std::os::raw::c_char,
            name.len(),
        );
        if js_name.is_null() {
            return Err("algorithm name string allocation failed".to_string());
        }
        rooted!(&in(cx_ref) let name_val = mozjs::jsval::StringValue(&*js_name));
        JS_DefineProperty(
            cx,
            obj_root.handle().into(),
            c"name".as_ptr(),
            name_val.handle().into(),
            JSPROP_ENUMERATE as u32,
        );
        return Ok((name, obj_root.get()));
    }
    if !val.is_object() {
        return Err("algorithm identifier must be a string or an object".to_string());
    }
    let obj = val.to_object();
    let name = subtle_str_prop(cx, obj, "name")
        .ok_or_else(|| "algorithm.name is required".to_string())?;
    Ok((name, obj))
}

/// Map an algorithm name + symmetric key length to the cipher algorithm.
fn aes_cipher_algo(name: &str, key_len: usize) -> ::std::result::Result<bao_crypto::cipher::CipherAlgorithm, String> {
    let bits = key_len * 8;
    let qualified = match name {
        "AES-GCM" => match bits {
            128 => "aes-128-gcm",
            192 => "aes-192-gcm",
            256 => "aes-256-gcm",
            _ => return Err(format!("invalid AES-GCM key length: {} bits", bits)),
        },
        "AES-CBC" => match bits {
            128 => "aes-128-cbc",
            192 => "aes-192-cbc",
            256 => "aes-256-cbc",
            _ => return Err(format!("invalid AES-CBC key length: {} bits", bits)),
        },
        other => return Err(format!("unsupported cipher algorithm: {}", other)),
    };
    bao_crypto::cipher::parse_algorithm(qualified).map_err(|e| e.to_string())
}

// ── subtle.encrypt / subtle.decrypt ─────────────────────────────────────────

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn subtle_encrypt(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    let promise = subtle_promise!(cx, cx_ref, &args);
    if promise.is_null() {
        return true;
    }
    rooted!(&in(cx_ref) let promise_root = promise);

    let result: ::std::result::Result<Vec<u8>, String> = (|| {
        if argc < 3 {
            return Err("encrypt(algorithm, key, data) requires 3 arguments".to_string());
        }
        let (name, alg_obj) = subtle_algo_name(cx, *args.get(0).ptr)?;
        let key_obj = subtle_arg_object(*args.get(1).ptr)
            .ok_or("encrypt: key must be a CryptoKey".to_string())?;
        let data = subtle_bytes(cx, *args.get(2).ptr);
        let raw = key_material(cx, key_obj, "_raw")
            .ok_or("encrypt: not a symmetric CryptoKey".to_string())?;

        match name.as_str() {
            "AES-GCM" => {
                let iv = subtle_bytes_prop(cx, alg_obj, "iv")
                    .ok_or("AES-GCM requires an iv".to_string())?;
                let aad = subtle_bytes_prop(cx, alg_obj, "additionalData");
                if let Some(tl) = subtle_u32_prop(cx, alg_obj, "tagLength") {
                    if tl != 128 {
                        return Err(format!("AES-GCM tagLength {} is not supported (128 only)", tl));
                    }
                }
                let algo = aes_cipher_algo("AES-GCM", raw.len())?;
                let out = bao_crypto::cipher::encrypt(algo, &raw, &iv, aad.as_deref(), &data)
                    .map_err(|e| e.to_string())?;
                let mut combined = out.ciphertext;
                combined.extend_from_slice(&out.auth_tag);
                Ok(combined)
            }
            "AES-CBC" => {
                let iv = subtle_bytes_prop(cx, alg_obj, "iv")
                    .ok_or("AES-CBC requires an iv".to_string())?;
                let algo = aes_cipher_algo("AES-CBC", raw.len())?;
                let mut ctx = bao_crypto::cipher::CipherCtx::new(
                    algo,
                    &raw,
                    &iv,
                    bao_crypto::cipher::Direction::Encrypt,
                )
                .map_err(|e| e.to_string())?;
                let mut out = ctx.update(&data).map_err(|e| e.to_string())?;
                out.extend_from_slice(&ctx.final_ex().map_err(|e| e.to_string())?);
                Ok(out)
            }
            other => Err(format!("subtle.encrypt: unsupported algorithm {}", other)),
        }
    })();

    match result {
        Ok(bytes) => {
            let v = bytes_to_arraybuffer_val(cx, &bytes);
            subtle_resolve(cx, promise_root.get(), v);
        }
        Err(msg) => subtle_reject(cx, promise_root.get(), &format!("subtle.encrypt: {}", msg)),
    }
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn subtle_decrypt(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    let promise = subtle_promise!(cx, cx_ref, &args);
    if promise.is_null() {
        return true;
    }
    rooted!(&in(cx_ref) let promise_root = promise);

    let result: ::std::result::Result<Vec<u8>, String> = (|| {
        if argc < 3 {
            return Err("decrypt(algorithm, key, data) requires 3 arguments".to_string());
        }
        let (name, alg_obj) = subtle_algo_name(cx, *args.get(0).ptr)?;
        let key_obj = subtle_arg_object(*args.get(1).ptr)
            .ok_or("decrypt: key must be a CryptoKey".to_string())?;
        let data = subtle_bytes(cx, *args.get(2).ptr);
        let raw = key_material(cx, key_obj, "_raw")
            .ok_or("decrypt: not a symmetric CryptoKey".to_string())?;

        match name.as_str() {
            "AES-GCM" => {
                let iv = subtle_bytes_prop(cx, alg_obj, "iv")
                    .ok_or("AES-GCM requires an iv".to_string())?;
                let aad = subtle_bytes_prop(cx, alg_obj, "additionalData");
                let tag_len = subtle_u32_prop(cx, alg_obj, "tagLength")
                    .map_or(16usize, |bits| bits as usize / 8);
                if tag_len != 16 {
                    return Err(format!("AES-GCM tagLength {} bits is not supported (128 only)", tag_len * 8));
                }
                if data.len() < tag_len {
                    return Err("AES-GCM ciphertext shorter than the auth tag".to_string());
                }
                let split = data.len() - tag_len;
                let algo = aes_cipher_algo("AES-GCM", raw.len())?;
                bao_crypto::cipher::decrypt(
                    algo,
                    &raw,
                    &iv,
                    aad.as_deref(),
                    &data[..split],
                    &data[split..],
                )
                .map_err(|_| "decryption failed (authentication or parameters)".to_string())
            }
            "AES-CBC" => {
                let iv = subtle_bytes_prop(cx, alg_obj, "iv")
                    .ok_or("AES-CBC requires an iv".to_string())?;
                let algo = aes_cipher_algo("AES-CBC", raw.len())?;
                let mut ctx = bao_crypto::cipher::CipherCtx::new(
                    algo,
                    &raw,
                    &iv,
                    bao_crypto::cipher::Direction::Decrypt,
                )
                .map_err(|e| e.to_string())?;
                let mut out = ctx.update(&data).map_err(|e| e.to_string())?;
                out.extend_from_slice(&ctx.final_ex().map_err(|e| e.to_string())?);
                Ok(out)
            }
            other => Err(format!("subtle.decrypt: unsupported algorithm {}", other)),
        }
    })();

    match result {
        Ok(bytes) => {
            let v = bytes_to_arraybuffer_val(cx, &bytes);
            subtle_resolve(cx, promise_root.get(), v);
        }
        Err(msg) => subtle_reject(cx, promise_root.get(), &format!("subtle.decrypt: {}", msg)),
    }
    true
}

// ── subtle.generateKey ──────────────────────────────────────────────────────

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn subtle_generate_key(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    let promise = subtle_promise!(cx, cx_ref, &args);
    if promise.is_null() {
        return true;
    }
    rooted!(&in(cx_ref) let promise_root = promise);

    let result: ::std::result::Result<*mut JSObject, String> = (|| {
        if argc < 3 {
            return Err("generateKey(algorithm, extractable, usages) requires 3 arguments".to_string());
        }
        let (name, alg_obj) = subtle_algo_name(cx, *args.get(0).ptr)?;
        let extractable = (*args.get(1).ptr).to_boolean();
        let usages = subtle_arg_object(*args.get(2).ptr)
            .ok_or("generateKey: usages must be an array".to_string())?;

        match name.as_str() {
            "AES-GCM" | "AES-CBC" => {
                let bits = subtle_u32_prop(cx, alg_obj, "length")
                    .ok_or("AES generateKey requires algorithm.length".to_string())?;
                if !matches!(bits, 128 | 192 | 256) {
                    return Err(format!("invalid AES key length {} (128/192/256)", bits));
                }
                let mut raw = vec![0u8; bits as usize / 8];
                bao_crypto::random::rand_bytes(&mut raw).map_err(|e| e.to_string())?;
                Ok(make_crypto_key(
                    cx,
                    "secret",
                    &name,
                    &[("length", bits.to_string())],
                    extractable,
                    usages,
                    "_raw",
                    &raw,
                ))
            }
            "RSA-RSASSA-PKCS1-v1_5" => {
                let bits = subtle_u32_prop(cx, alg_obj, "modulusLength")
                    .ok_or("RSA generateKey requires modulusLength".to_string())? as usize;
                let hash = subtle_str_prop(cx, alg_obj, "hash")
                    .or_else(|| subtle_str_prop(cx, alg_obj, "hash.name"))
                    .unwrap_or_else(|| "SHA-256".to_string());
                let kp = bao_crypto::keypair::generate_key_pair(&bao_crypto::keypair::KeyPairType::Rsa { bits })
                    .map_err(|e| e.to_string())?;
                Ok(make_crypto_key_pair(
                    cx,
                    &name,
                    &[("hash", hash)],
                    extractable,
                    usages,
                    &kp.private_key_der,
                    &kp.public_key_der,
                ))
            }
            "ECDSA" => {
                let curve = subtle_str_prop(cx, alg_obj, "namedCurve")
                    .or_else(|| subtle_str_prop(cx, alg_obj, "namedCurve.name"))
                    .ok_or("ECDSA generateKey requires namedCurve".to_string())?;
                let ec_curve = match curve.as_str() {
                    "P-256" => bao_crypto::keypair::EcCurve::P256,
                    "P-384" => bao_crypto::keypair::EcCurve::P384,
                    other => return Err(format!("unsupported ECDSA curve {}", other)),
                };
                let kp = bao_crypto::keypair::generate_key_pair(&bao_crypto::keypair::KeyPairType::Ec { curve: ec_curve })
                    .map_err(|e| e.to_string())?;
                Ok(make_crypto_key_pair(
                    cx,
                    &name,
                    &[("namedCurve", curve)],
                    extractable,
                    usages,
                    &kp.private_key_der,
                    &kp.public_key_der,
                ))
            }
            other => Err(format!("subtle.generateKey: unsupported algorithm {}", other)),
        }
    })();

    match result {
        Ok(key) if !key.is_null() => {
            let v = ObjectValue(key);
            subtle_resolve(cx, promise_root.get(), v);
        }
        Ok(_) => subtle_reject(cx, promise_root.get(), "subtle.generateKey: key construction failed"),
        Err(msg) => subtle_reject(cx, promise_root.get(), &format!("subtle.generateKey: {}", msg)),
    }
    true
}

// ── subtle.importKey ────────────────────────────────────────────────────────

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn subtle_import_key(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    let promise = subtle_promise!(cx, cx_ref, &args);
    if promise.is_null() {
        return true;
    }
    rooted!(&in(cx_ref) let promise_root = promise);

    let result: ::std::result::Result<*mut JSObject, String> = (|| {
        if argc < 5 {
            return Err("importKey(format, keyData, algorithm, extractable, usages) requires 5 arguments".to_string());
        }
        let format = crate::js_to_rust_string(cx, *args.get(0).ptr);
        let (name, _alg_obj) = subtle_algo_name(cx, *args.get(2).ptr)?;
        let extractable = (*args.get(3).ptr).to_boolean();
        let usages = subtle_arg_object(*args.get(4).ptr)
            .ok_or("importKey: usages must be an array".to_string())?;

        match format.as_str() {
            "raw" => {
                let raw = subtle_bytes(cx, *args.get(1).ptr);
                if raw.is_empty() {
                    return Err("raw import requires key bytes".to_string());
                }
                match name.as_str() {
                    "AES-GCM" | "AES-CBC" => {
                        if !matches!(raw.len() * 8, 128 | 192 | 256) {
                            return Err(format!("invalid AES key length {} bits", raw.len() * 8));
                        }
                        Ok(make_crypto_key(cx, "secret", &name, &[("length", (raw.len() * 8).to_string())], extractable, usages, "_raw", &raw))
                    }
                    "HMAC" => {
                        let hash = subtle_str_prop(cx, _alg_obj, "hash")
                            .or_else(|| subtle_str_prop(cx, _alg_obj, "hash.name"))
                            .ok_or("HMAC import requires algorithm.hash".to_string())?;
                        Ok(make_crypto_key(cx, "secret", "HMAC", &[("hash", hash)], extractable, usages, "_raw", &raw))
                    }
                    other => Err(format!("subtle.importKey raw: unsupported algorithm {}", other)),
                }
            }
            "pkcs8" => {
                let der = subtle_bytes(cx, *args.get(1).ptr);
                if der.is_empty() {
                    return Err("pkcs8 import requires DER bytes".to_string());
                }
                let extras: Vec<(String, String)> = match name.as_str() {
                    "RSA-RSASSA-PKCS1-v1_5" => {
                        let hash = subtle_str_prop(cx, _alg_obj, "hash")
                            .or_else(|| subtle_str_prop(cx, _alg_obj, "hash.name"))
                            .unwrap_or_else(|| "SHA-256".to_string());
                        vec![("hash".to_string(), hash)]
                    }
                    "ECDSA" => {
                        let curve = subtle_str_prop(cx, _alg_obj, "namedCurve")
                            .or_else(|| subtle_str_prop(cx, _alg_obj, "namedCurve.name"))
                            .unwrap_or_else(|| "P-256".to_string());
                        vec![("namedCurve".to_string(), curve)]
                    }
                    other => return Err(format!("subtle.importKey pkcs8: unsupported algorithm {}", other)),
                };
                let extras_ref: Vec<(&str, String)> = extras.iter().map(|(k, v)| (k.as_str(), v.clone())).collect();
                Ok(make_crypto_key(cx, "private", &name, &extras_ref, extractable, usages, "_der", &der))
            }
            "spki" => {
                let der = subtle_bytes(cx, *args.get(1).ptr);
                if der.is_empty() {
                    return Err("spki import requires DER bytes".to_string());
                }
                let extras: Vec<(String, String)> = match name.as_str() {
                    "RSA-RSASSA-PKCS1-v1_5" => {
                        let hash = subtle_str_prop(cx, _alg_obj, "hash")
                            .or_else(|| subtle_str_prop(cx, _alg_obj, "hash.name"))
                            .unwrap_or_else(|| "SHA-256".to_string());
                        vec![("hash".to_string(), hash)]
                    }
                    "ECDSA" => {
                        let curve = subtle_str_prop(cx, _alg_obj, "namedCurve")
                            .or_else(|| subtle_str_prop(cx, _alg_obj, "namedCurve.name"))
                            .unwrap_or_else(|| "P-256".to_string());
                        vec![("namedCurve".to_string(), curve)]
                    }
                    other => return Err(format!("subtle.importKey spki: unsupported algorithm {}", other)),
                };
                let extras_ref: Vec<(&str, String)> = extras.iter().map(|(k, v)| (k.as_str(), v.clone())).collect();
                Ok(make_crypto_key(cx, "public", &name, &extras_ref, extractable, usages, "_der", &der))
            }
            "jwk" => {
                // Symmetric oct keys: { kty: "oct", k: <base64url> }. Asymmetric
                // JWK import requires JWK→DER assembly which is NOT wired —
                // explicit NotSupported error, never a silent fallback.
                if !(*args.get(1).ptr).is_object() {
                    return Err("jwk import requires a JWK object".to_string());
                }
                let jwk = (*args.get(1).ptr).to_object();
                let kty = subtle_str_prop(cx, jwk, "kty").unwrap_or_default();
                if kty != "oct" {
                    return Err(format!("jwk import for kty \"{}\" is not supported (oct only); use pkcs8/spki DER import", kty));
                }
                let k = subtle_str_prop(cx, jwk, "k").ok_or("oct JWK requires the k field".to_string())?;
                let src = k.as_bytes();
                let upper = bun_base64::decode_lenient_len(src.len());
                let mut out = vec![0u8; upper];
                let n = bun_base64::decode_lenient(&mut out, src, true);
                out.truncate(n);
                if out.is_empty() {
                    return Err("oct JWK k field decoded to zero bytes".to_string());
                }
                match name.as_str() {
                    "AES-GCM" | "AES-CBC" => {
                        if !matches!(out.len() * 8, 128 | 192 | 256) {
                            return Err(format!("invalid AES key length {} bits from JWK", out.len() * 8));
                        }
                        Ok(make_crypto_key(cx, "secret", &name, &[("length", (out.len() * 8).to_string())], extractable, usages, "_raw", &out))
                    }
                    "HMAC" => {
                        let hash = subtle_str_prop(cx, _alg_obj, "hash")
                            .or_else(|| subtle_str_prop(cx, _alg_obj, "hash.name"))
                            .ok_or("HMAC import requires algorithm.hash".to_string())?;
                        Ok(make_crypto_key(cx, "secret", "HMAC", &[("hash", hash)], extractable, usages, "_raw", &out))
                    }
                    other => Err(format!("subtle.importKey jwk: unsupported algorithm {}", other)),
                }
            }
            other => Err(format!("subtle.importKey: unsupported format {}", other)),
        }
    })();

    match result {
        Ok(key) if !key.is_null() => {
            let v = ObjectValue(key);
            subtle_resolve(cx, promise_root.get(), v);
        }
        Ok(_) => subtle_reject(cx, promise_root.get(), "subtle.importKey: key construction failed"),
        Err(msg) => subtle_reject(cx, promise_root.get(), &format!("subtle.importKey: {}", msg)),
    }
    true
}

// ── subtle.sign / subtle.verify ─────────────────────────────────────────────

fn subtle_hmac_algorithm(hash: &str) -> ::std::result::Result<bun_sha_hmac::sha::evp::Algorithm, String> {
    use bun_sha_hmac::sha::evp::Algorithm;
    Ok(match hash.to_uppercase().as_str() {
        "SHA-1" => Algorithm::Sha1,
        "SHA-224" => Algorithm::Sha224,
        "SHA-256" => Algorithm::Sha256,
        "SHA-384" => Algorithm::Sha384,
        "SHA-512" => Algorithm::Sha512,
        other => return Err(format!("unsupported HMAC hash {}", other)),
    })
}

fn subtle_rsa_hash(hash: &str) -> ::std::result::Result<bao_crypto::sign::RsaHash, String> {
    Ok(match hash.to_uppercase().as_str() {
        "SHA-256" => bao_crypto::sign::RsaHash::Sha256,
        "SHA-384" => bao_crypto::sign::RsaHash::Sha384,
        "SHA-512" => bao_crypto::sign::RsaHash::Sha512,
        other => return Err(format!("unsupported RSA hash {}", other)),
    })
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn subtle_sign(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    let promise = subtle_promise!(cx, cx_ref, &args);
    if promise.is_null() {
        return true;
    }
    rooted!(&in(cx_ref) let promise_root = promise);

    let result: ::std::result::Result<Vec<u8>, String> = (|| {
        if argc < 3 {
            return Err("sign(algorithm, key, data) requires 3 arguments".to_string());
        }
        let (name, alg_obj) = subtle_algo_name(cx, *args.get(0).ptr)?;
        let key_obj = subtle_arg_object(*args.get(1).ptr)
            .ok_or("sign: key must be a CryptoKey".to_string())?;
        // BCE-root discipline: the handle must outlive the GetProperty call —
        // a rooted! binding inside a block expression un-roots at the block's
        // closing brace, leaving JS_GetProperty with a dangling Handle.
        rooted!(&in(cx_ref) let key_obj_root = key_obj);
        let data = subtle_bytes(cx, *args.get(2).ptr);

        let key_alg = {
            let mut v = UndefinedValue();
            JS_GetProperty(
                cx,
                key_obj_root.handle().into(),
                c"algorithm".as_ptr(),
                MutableHandle::<Value> {
                    _phantom_0: ::std::marker::PhantomData,
                    ptr: &mut v,
                },
            );
            if !v.is_object() {
                return Err("sign: not a CryptoKey".to_string());
            }
            v.to_object()
        };
        let ktype = subtle_str_prop(cx, key_obj, "type").unwrap_or_default();

        match name.as_str() {
            "HMAC" => {
                let raw = key_material(cx, key_obj, "_raw")
                    .ok_or("sign: not a symmetric CryptoKey".to_string())?;
                // The hash is a property of the KEY's algorithm (what the key
                // was imported with); an explicit hash on the algorithm
                // argument (object form only — the string form carries no
                // params) wins, mirroring the object-form behavior.
                let hash = subtle_str_prop(cx, alg_obj, "hash")
                    .or_else(|| subtle_str_prop(cx, key_alg, "hash"))
                    .unwrap_or_else(|| "SHA-256".to_string());
                let algo = subtle_hmac_algorithm(&hash)?;
                let mut out = [0u8; bun_sha_hmac::hmac::EVP_MAX_MD_SIZE];
                let mac = bun_sha_hmac::hmac::generate(&raw, &data, algo, &mut out)
                    .ok_or("HMAC computation failed".to_string())?;
                Ok(mac.to_vec())
            }
            "RSA-RSASSA-PKCS1-v1_5" | "RSASSA-PKCS1-v1_5" => {
                if ktype != "private" {
                    return Err("sign: not a private CryptoKey".to_string());
                }
                let der = key_material(cx, key_obj, "_der")
                    .ok_or("sign: not a private CryptoKey".to_string())?;
                let hash = subtle_str_prop(cx, key_alg, "hash")
                    .unwrap_or_else(|| "SHA-256".to_string());
                let signer = bao_crypto::sign::Signer::from_pkcs8_der(
                    &bao_crypto::sign::SignAlgorithm::RsaPkcs1v15 { hash: subtle_rsa_hash(&hash)? },
                    &der,
                )
                .map_err(|e| e.to_string())?;
                signer
                    .sign(&data, bao_crypto::sign::SignatureFormat::Der)
                    .map_err(|e| e.to_string())
            }
            "ECDSA" => {
                if ktype != "private" {
                    return Err("sign: not a private CryptoKey".to_string());
                }
                let der = key_material(cx, key_obj, "_der")
                    .ok_or("sign: not a private CryptoKey".to_string())?;
                let curve = subtle_str_prop(cx, key_alg, "namedCurve").unwrap_or_else(|| "P-256".to_string());
                let algo = match curve.as_str() {
                    "P-256" => bao_crypto::sign::SignAlgorithm::EcdsaP256,
                    "P-384" => bao_crypto::sign::SignAlgorithm::EcdsaP384,
                    other => return Err(format!("unsupported ECDSA curve {}", other)),
                };
                let signer = bao_crypto::sign::Signer::from_pkcs8_der(&algo, &der)
                    .map_err(|e| e.to_string())?;
                // WebCrypto ECDSA signatures are raw r||s.
                signer
                    .sign(&data, bao_crypto::sign::SignatureFormat::Raw)
                    .map_err(|e| e.to_string())
            }
            other => Err(format!("subtle.sign: unsupported algorithm {}", other)),
        }
    })();

    match result {
        Ok(bytes) => {
            let v = bytes_to_arraybuffer_val(cx, &bytes);
            subtle_resolve(cx, promise_root.get(), v);
        }
        Err(msg) => subtle_reject(cx, promise_root.get(), &format!("subtle.sign: {}", msg)),
    }
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn subtle_verify(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    let mut wrapped_cx = mozjs::context::JSContext::from_ptr(NonNull::new_unchecked(cx));
    let cx_ref = &mut wrapped_cx;
    let promise = subtle_promise!(cx, cx_ref, &args);
    if promise.is_null() {
        return true;
    }
    rooted!(&in(cx_ref) let promise_root = promise);

    let result: ::std::result::Result<bool, String> = (|| {
        if argc < 4 {
            return Err("verify(algorithm, key, signature, data) requires 4 arguments".to_string());
        }
        let (name, _alg_obj) = subtle_algo_name(cx, *args.get(0).ptr)?;
        let key_obj = subtle_arg_object(*args.get(1).ptr)
            .ok_or("verify: key must be a CryptoKey".to_string())?;
        // Same root discipline as subtle_sign — no block-scoped roots in args.
        rooted!(&in(cx_ref) let key_obj_root = key_obj);
        let signature = subtle_bytes(cx, *args.get(2).ptr);
        let data = subtle_bytes(cx, *args.get(3).ptr);

        let key_alg = {
            let mut v = UndefinedValue();
            JS_GetProperty(
                cx,
                key_obj_root.handle().into(),
                c"algorithm".as_ptr(),
                MutableHandle::<Value> {
                    _phantom_0: ::std::marker::PhantomData,
                    ptr: &mut v,
                },
            );
            if !v.is_object() {
                return Err("verify: not a CryptoKey".to_string());
            }
            v.to_object()
        };
        let ktype = subtle_str_prop(cx, key_obj, "type").unwrap_or_default();

        match name.as_str() {
            "HMAC" => {
                let raw = key_material(cx, key_obj, "_raw")
                    .ok_or("verify: not a symmetric CryptoKey".to_string())?;
                let hash = subtle_str_prop(cx, key_alg, "hash").unwrap_or_else(|| "SHA-256".to_string());
                let algo = subtle_hmac_algorithm(&hash)?;
                let mut out = [0u8; bun_sha_hmac::hmac::EVP_MAX_MD_SIZE];
                let Some(mac) = bun_sha_hmac::hmac::generate(&raw, &data, algo, &mut out) else {
                    return Err("HMAC computation failed".to_string());
                };
                Ok(ct_eq(mac, &signature))
            }
            "RSA-RSASSA-PKCS1-v1_5" | "RSASSA-PKCS1-v1_5" => {
                let hash = subtle_str_prop(cx, key_alg, "hash").unwrap_or_else(|| "SHA-256".to_string());
                let algo = bao_crypto::sign::SignAlgorithm::RsaPkcs1v15 { hash: subtle_rsa_hash(&hash)? };
                let verifier = if ktype == "private" {
                    let der = key_material(cx, key_obj, "_der")
                        .ok_or("verify: key carries no DER material".to_string())?;
                    bao_crypto::verify::Verifier::from_pkcs8_der(&algo, &der)
                } else {
                    let der = key_material(cx, key_obj, "_der")
                        .ok_or("verify: key carries no DER material".to_string())?;
                    bao_crypto::verify::Verifier::from_public_der(&algo, &der)
                }
                .map_err(|e| e.to_string())?;
                verifier
                    .verify(&data, &signature, bao_crypto::sign::SignatureFormat::Der)
                    .map_err(|e| e.to_string())
            }
            "ECDSA" => {
                let curve = subtle_str_prop(cx, key_alg, "namedCurve").unwrap_or_else(|| "P-256".to_string());
                let algo = match curve.as_str() {
                    "P-256" => bao_crypto::sign::SignAlgorithm::EcdsaP256,
                    "P-384" => bao_crypto::sign::SignAlgorithm::EcdsaP384,
                    other => return Err(format!("unsupported ECDSA curve {}", other)),
                };
                let verifier = if ktype == "private" {
                    let der = key_material(cx, key_obj, "_der")
                        .ok_or("verify: key carries no DER material".to_string())?;
                    bao_crypto::verify::Verifier::from_pkcs8_der(&algo, &der)
                } else {
                    let der = key_material(cx, key_obj, "_der")
                        .ok_or("verify: key carries no DER material".to_string())?;
                    bao_crypto::verify::Verifier::from_public_der(&algo, &der)
                }
                .map_err(|e| e.to_string())?;
                // WebCrypto ECDSA signatures are raw r||s.
                verifier
                    .verify(&data, &signature, bao_crypto::sign::SignatureFormat::Raw)
                    .map_err(|e| e.to_string())
            }
            other => Err(format!("subtle.verify: unsupported algorithm {}", other)),
        }
    })();

    match result {
        Ok(ok) => {
            let v = BooleanValue(ok);
            subtle_resolve(cx, promise_root.get(), v);
        }
        Err(msg) => subtle_reject(cx, promise_root.get(), &format!("subtle.verify: {}", msg)),
    }
    true
}

// ═══════════════════════════════════════════════════════════════════════════
// localStorage — CLI mode. Persisted store at ~/.bao/localstorage.json
// (browser pages keep servo's own localStorage; this is the CLI surface).
// @trace REQ-ENG-006 [api:localStorage]
// ═══════════════════════════════════════════════════════════════════════════

fn localstorage_path() -> ::std::path::PathBuf {
    let home = ::std::env::var("HOME").unwrap_or_else(|_| ".".to_string());
    let dir = ::std::path::Path::new(&home).join(".bao");
    let _ = ::std::fs::create_dir_all(&dir);
    dir.join("localstorage.json")
}

::std::thread_local! {
    static LS_STORE: RefCell<Option<::std::collections::BTreeMap<String, String>>> =
        const { RefCell::new(None) };
}

/// Lazy-load the persisted store (missing/corrupt file → empty map; a corrupt
/// file is reported to stderr but never breaks the API — next mutation
/// rewrites the file with valid JSON).
fn ls_with_store<R>(f: impl FnOnce(&mut ::std::collections::BTreeMap<String, String>) -> R) -> R {
    LS_STORE.with(|cell| {
        let mut guard = cell.borrow_mut();
        if guard.is_none() {
            let map = ::std::fs::read_to_string(localstorage_path())
                .ok()
                .and_then(|text| serde_json::from_str::<serde_json::Value>(&text).ok())
                .and_then(|v| {
                    let obj = v.as_object()?;
                    let mut m = ::std::collections::BTreeMap::new();
                    for (k, val) in obj {
                        if let Some(s) = val.as_str() {
                            m.insert(k.clone(), s.to_string());
                        }
                    }
                    Some(m)
                })
                .unwrap_or_default();
            *guard = Some(map);
        }
        f(guard.as_mut().unwrap())
    })
}

fn ls_persist() {
    LS_STORE.with(|cell| {
        if let Some(map) = cell.borrow().as_ref() {
            if let Ok(text) = serde_json::to_string_pretty(map) {
                let tmp = localstorage_path().with_extension("json.tmp");
                if ::std::fs::write(&tmp, text).is_ok() {
                    let _ = ::std::fs::rename(&tmp, localstorage_path());
                }
            }
        }
    });
}

/// Install localStorage on the global (CLI surface; browser pages keep
/// servo's own implementation, so installation only fills a missing slot).
pub fn install_local_storage(cx: &mut mozjs::context::JSContext, global: mozjs::rust::Handle<*mut JSObject>) {
    unsafe {
        rooted!(&in(cx) let global_root = global.get());
        let mut existing = UndefinedValue();
        let found = JS_GetProperty(
            cx.raw_cx(),
            global_root.handle().into(),
            c"localStorage".as_ptr(),
            MutableHandle::<Value> {
                _phantom_0: ::std::marker::PhantomData,
                ptr: &mut existing,
            },
        );
        // BCE (browser startup panic, servo error.rs:74): the probe's failure
        // return MUST be consumed. On an opaque-origin page (data:/about:
        // blank) servo's `window.localStorage` getter THROWS SecurityError —
        // JS_GetProperty returns false with the exception pending. The old
        // code ignored the return, leaving the pending exception on the
        // context; the next servo error path (`throw_dom_exception`) then
        // tripped `assert!(!JS_IsExceptionPending)` and killed Script#1 at
        // startup (pipeline never ready, CDP never listening). This is a
        // Rust-side capability probe, so a throwing getter means "servo owns
        // storage here, possibly origin-blocked" — clear the exception and
        // leave the page's storage semantics to servo.
        if !found {
            JS_ClearPendingException(cx.raw_cx());
            return; // browser page context — servo's storage stays
        }
        if existing.is_object() {
            return; // browser page context — servo's storage stays
        }
        rooted!(&in(cx) let ls = JS_NewPlainObject(cx));
        if ls.get().is_null() {
            return;
        }
        let lh = ls.handle();
        for (name, op, nargs) in [
            ("getItem", ls_get_item as unsafe extern "C" fn(*mut JSContext, u32, *mut JSVal) -> bool, 1),
            ("setItem", ls_set_item, 2),
            ("removeItem", ls_remove_item, 1),
            ("clear", ls_clear, 0),
            ("key", ls_key, 1),
        ] {
            JS_DefineFunction(
                cx,
                lh,
                ZBox::from_bytes(name.as_bytes()).as_ptr(),
                Some(op),
                nargs,
                JSPROP_ENUMERATE as u32,
            );
        }
        // length getter (JS_DefineProperty1: getter/setter native variant)
        JS_DefineProperty1(
            cx.raw_cx(),
            ls.handle().into(),
            c"length".as_ptr(),
            Some(ls_length_getter),
            None,
            (JSPROP_ENUMERATE | JSPROP_READONLY) as u32,
        );
        rooted!(&in(cx) let ls_root = ls.get());
        JS_DefineProperty3(
            cx,
            global,
            c"localStorage".as_ptr(),
            ls_root.handle(),
            (JSPROP_ENUMERATE | JSPROP_PERMANENT) as u32,
        );
    }
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn ls_get_item(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    if argc < 1 || !(*args.get(0).ptr).is_string() {
        args.rval().set(UndefinedValue());
        return true;
    }
    let key = crate::js_to_rust_string(cx, *args.get(0).ptr);
    ls_with_store(|m| {
        let v = m.get(&key).cloned();
        match v {
            Some(s) => {
                let c_s = ZBox::from_bytes(s.as_bytes());
                let js = JS_NewStringCopyZ(cx, c_s.as_ptr());
                args.rval().set(if js.is_null() {
                    UndefinedValue()
                } else {
                    StringValue(&*js)
                });
            }
            None => args.rval().set(NullValue()),
        }
    });
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn ls_set_item(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    if argc < 2 {
        let c_m = ZBox::from_bytes("localStorage.setItem(key, value) requires 2 arguments".as_bytes());
        JS_ReportErrorUTF8(cx, c"%s".as_ptr(), c_m.as_ptr());
        return false;
    }
    let key = crate::js_to_rust_string(cx, *args.get(0).ptr);
    let val = crate::js_to_rust_string(cx, *args.get(1).ptr);
    ls_with_store(|m| {
        m.insert(key, val);
    });
    ls_persist();
    args.rval().set(UndefinedValue());
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn ls_remove_item(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    if argc < 1 {
        args.rval().set(UndefinedValue());
        return true;
    }
    let key = crate::js_to_rust_string(cx, *args.get(0).ptr);
    ls_with_store(|m| {
        m.remove(&key);
    });
    ls_persist();
    args.rval().set(UndefinedValue());
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn ls_clear(_cx: *mut JSContext, _argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, _argc);
    ls_with_store(|m| {
        m.clear();
    });
    ls_persist();
    args.rval().set(UndefinedValue());
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn ls_key(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, argc);
    if argc < 1 || !(*args.get(0).ptr).is_int32() {
        args.rval().set(NullValue());
        return true;
    }
    let idx = (*args.get(0).ptr).to_int32();
    if idx < 0 {
        args.rval().set(NullValue());
        return true;
    }
    let val = ls_with_store(|m| {
        m.keys().nth(idx as usize).cloned()
    });
    match val {
        Some(k) => {
            let c_k = ZBox::from_bytes(k.as_bytes());
            let js = JS_NewStringCopyZ(cx, c_k.as_ptr());
            args.rval().set(if js.is_null() {
                NullValue()
            } else {
                StringValue(&*js)
            });
        }
        None => args.rval().set(NullValue()),
    }
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn ls_length(_cx: *mut JSContext, _argc: u32, vp: *mut JSVal) -> bool {
    let args = CallArgs::from_vp(vp, _argc);
    let n = ls_with_store(|m| m.len());
    args.rval().set(Int32Value(n as i32));
    true
}

#[allow(unsafe_op_in_unsafe_fn)]
unsafe extern "C" fn ls_length_getter(cx: *mut JSContext, _argc: u32, vp: *mut JSVal) -> bool {
    ls_length(cx, _argc, vp)
}

// ═══════════════════════════════════════════════════════════════════════════
// EventSource — SSE client over fetch(). Pure-JS class: fetch + TextDecoder
// + timers are all real runtime surfaces; the SSE framing/retry state
// machine follows the WHATWG spec's event-stream parsing algorithm.
//
// Streaming note: fetch() currently materialises the full body, so events
// arrive in one batch when the response completes (then auto-reconnect fires
// per the retry interval). The parser itself is the real spec algorithm and
// upgrades unchanged once fetch lands response streaming.
// @trace REQ-ENG-006 [api:EventSource]
//
// Also registers the CLI-mode window/document explicit gates (DOMParser
// style): referencing/typeof works, every METHOD call throws the honest
// "browser context required" error — no silent empty-DOM fakes.
// ═══════════════════════════════════════════════════════════════════════════

pub fn install_event_source(cx: &mut mozjs::context::JSContext, global: mozjs::rust::Handle<*mut JSObject>) {
    let src = r#"
(function() {
  var _g = globalThis;

  // ── EventSource ──
  var CONNECTING = 0, OPEN = 1, CLOSED = 2;

  function EventSource(url) {
    if (!(this instanceof EventSource)) return new EventSource(url);
    this.url = String(url);
    this.readyState = CONNECTING;
    this._retry = 3000;
    this._lastEventId = '';
    this._timer = null;
    this._listeners = {};
    this.onopen = null;
    this.onmessage = null;
    this.onerror = null;
    var self = this;
    this._connect();
  }
  EventSource.CONNECTING = CONNECTING;
  EventSource.OPEN = OPEN;
  EventSource.CLOSED = CLOSED;

  EventSource.prototype._fire = function(type, ev) {
    ev = ev || {};
    ev.type = type;
    var handler = this['on' + type];
    if (typeof handler === 'function') handler.call(this, ev);
    var list = this._listeners[type];
    if (list) {
      for (var i = 0; i < list.length; i++) list[i].call(this, ev);
    }
  };

  EventSource.prototype._connect = function() {
    var self = this;
    if (this.readyState === CLOSED) return;
    this.readyState = CONNECTING;
    var headers = { 'Accept': 'text/event-stream' };
    if (this._lastEventId) headers['Last-Event-ID'] = this._lastEventId;
    fetch(this.url, { headers: headers })
      .then(function(resp) {
        if (!resp.ok) {
          self._fail('EventSource: HTTP ' + resp.status + ' for ' + self.url);
          return null;
        }
        // Spec: the response MIME type must be text/event-stream.
        var ct = resp.headers && resp.headers.get && resp.headers.get('content-type');
        if (ct && String(ct).indexOf('text/event-stream') === -1) {
          self._fail('EventSource: response Content-Type "' + ct + '" is not text/event-stream');
          return null;
        }
        self.readyState = OPEN;
        self._fire('open');
        return resp.text();
      })
      .then(function(text) {
        if (text === null || text === undefined) return;
        self._parse(text);
        // Server closed the stream — spec: schedule reconnect.
        self._scheduleReconnect();
      })
      .catch(function(err) {
        self._fail(err && err.message ? err.message : String(err));
      });
  };

  EventSource.prototype._fail = function(msg) {
    if (this.readyState === CLOSED) return;
    this._fire('error', { message: msg });
    this._scheduleReconnect();
  };

  EventSource.prototype._scheduleReconnect = function() {
    var self = this;
    if (this.readyState === CLOSED) return;
    this.readyState = CONNECTING;
    if (this._timer) clearTimeout(this._timer);
    this._timer = setTimeout(function() { self._connect(); }, this._retry);
  };

  // WHATWG event-stream parsing: lines split on CR/LF/CRLF, fields
  // event/data/id/retry, blank line dispatches the accumulated event.
  EventSource.prototype._parse = function(text) {
    var lines = text.split(/\r\n|\r|\n/);
    var dataLines = [], eventName = '', lastId = this._lastEventId;
    for (var i = 0; i < lines.length; i++) {
      var line = lines[i];
      if (line === '') {
        if (dataLines.length > 0) {
          var ev = { data: dataLines.join('\n'), lastEventId: lastId };
          if (eventName !== '' && eventName !== 'message') {
            ev.lastEventId = lastId;
            this._fire(eventName, ev);
          } else {
            this._fire('message', ev);
          }
        }
        dataLines = [];
        eventName = '';
        continue;
      }
      if (line.charCodeAt(0) === 0x3a /* ':' */) continue; // comment
      var colon = line.indexOf(':');
      var field, value;
      if (colon === -1) { field = line; value = ''; }
      else {
        field = line.slice(0, colon);
        value = line.slice(colon + 1);
        if (value.charCodeAt(0) === 0x20 /* ' ' */) value = value.slice(1);
      }
      if (field === 'event') eventName = value;
      else if (field === 'data') dataLines.push(value);
      else if (field === 'id') { if (value.indexOf('\0') === -1) lastId = value; }
      else if (field === 'retry') {
        var n = parseInt(value, 10);
        if (!isNaN(n)) this._retry = n;
      }
    }
    this._lastEventId = lastId;
    // A trailing non-blank data block without the final blank line is NOT
    // dispatched (spec: incomplete event at stream end).
  };

  EventSource.prototype.close = function() {
    if (this._timer) { clearTimeout(this._timer); this._timer = null; }
    this.readyState = CLOSED;
  };

  EventSource.prototype.addEventListener = function(type, cb) {
    if (typeof cb !== 'function') return;
    if (!this._listeners[type]) this._listeners[type] = [];
    this._listeners[type].push(cb);
  };
  EventSource.prototype.removeEventListener = function(type, cb) {
    var list = this._listeners[type];
    if (!list) return;
    var i = list.indexOf(cb);
    if (i !== -1) list.splice(i, 1);
  };

  _g.EventSource = EventSource;

  // ── window/document: CLI leaves them UNDEFINED (team-lead ruling, Node
  // parity). An "exists but every property is a throwing placeholder" gate
  // is itself the silent-fake shape (feature detection sees a window that
  // lies about existing); honest MISSING — typeof window === 'undefined' —
  // matches Node and the DOMParser philosophy. Browser pages keep servo's
  // real window/document; bare references in CLI throw ReferenceError, which
  // IS the explicit signal.
})();
"#;
    unsafe {
        let raw = cx.raw_cx();
        let mut rval = UndefinedValue();
        let opts = mozjs::glue::NewCompileOptions(raw, c"event_source".as_ptr(), 1);
        if !opts.is_null() {
            let mut src_text = mozjs::rust::transform_str_to_source_text(src);
            mozjs_sys::jsapi::JS::Evaluate2(
                raw,
                opts,
                &mut src_text,
                MutableHandle::<Value> {
                    _phantom_0: ::std::marker::PhantomData,
                    ptr: &mut rval,
                },
            );
            libc::free(opts as *mut _);
        }
        let _ = global;
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn parse_ws_url_ws() {
        let (host, port, path) = split_authority_and_path("example.com/chat", "ws");
        assert_eq!(host, "example.com");
        assert_eq!(port, 80);
        assert_eq!(path, "/chat");
    }

    // @trace REQ-ENG-006 [api:WebSocket wss://] — wss:// is now supported
    // (default port 443); the prior behaviour rejected it outright.
    #[test]
    fn parse_ws_url_wss_default_port() {
        let (host, port, path) = split_authority_and_path("example.com/secure", "wss");
        assert_eq!(host, "example.com");
        assert_eq!(port, 443);
        assert_eq!(path, "/secure");
    }

    #[test]
    fn parse_ws_url_with_port() {
        let (host, port, path) = split_authority_and_path("localhost:8080/ws", "ws");
        assert_eq!(host, "localhost");
        assert_eq!(port, 8080);
        assert_eq!(path, "/ws");
    }

    #[test]
    fn parse_ws_url_default_path() {
        let (_, _, path) = split_authority_and_path("host/", "ws");
        assert_eq!(path, "/");
    }

    #[test]
    fn parse_ws_url_no_path_defaults_to_slash() {
        let (_, _, path) = split_authority_and_path("host", "ws");
        assert_eq!(path, "/");
    }

    #[test]
    fn parse_ws_url_empty_string() {
        let (host, port, path) = split_authority_and_path("", "ws");
        assert_eq!(host, "");
        assert_eq!(port, 80);
        assert_eq!(path, "/");
    }

    #[test]
    fn parse_ws_url_ipv4_with_port() {
        let (host, port, path) = split_authority_and_path("127.0.0.1:9222/json", "ws");
        assert_eq!(host, "127.0.0.1");
        assert_eq!(port, 9222);
        assert_eq!(path, "/json");
    }

    #[test]
    fn parse_ws_url_query_string() {
        let (host, port, path) = split_authority_and_path("example.com/ws?token=abc", "ws");
        assert_eq!(host, "example.com");
        assert_eq!(port, 80);
        assert!(path.starts_with("/ws"));
    }

    #[test]
    fn parse_ws_url_deep_path() {
        let (host, _, path) = split_authority_and_path("host/a/b/c/d", "ws");
        assert_eq!(host, "host");
        assert_eq!(path, "/a/b/c/d");
    }

    // @trace REQ-ENG-006 [code:bun_uws] — frame length encoding now shares
    // bun_uws::ws_codec's layout via push_masked_len (the client→server masked
    // length bytes). The masking key itself is per-frame random in the live
    // path, so these unit tests verify only the length-byte shape.
    #[test]
    fn push_masked_len_empty() {
        let mut frame = Vec::new();
        push_masked_len(&mut frame, 0);
        assert_eq!(frame.len(), 1);
        assert_eq!(frame[0] & 0x7F, 0); // length = 0
    }

    #[test]
    fn push_masked_len_short() {
        let mut frame = Vec::new();
        push_masked_len(&mut frame, 5);
        assert_eq!(frame.len(), 1);
        assert_eq!(frame[0] & 0x7F, 5); // length = 5
    }

    #[test]
    fn push_masked_len_medium() {
        let mut frame = Vec::new();
        let payload = vec![0u8; 200];
        push_masked_len(&mut frame, payload.len());
        // 1 byte + 2 bytes extended length
        assert_eq!(frame.len(), 3);
        assert_eq!(frame[0] & 0x7F, 126); // 126 signals 16-bit length
        let ext_len = u16::from_be_bytes([frame[1], frame[2]]);
        assert_eq!(ext_len, 200);
    }

    #[test]
    fn push_masked_len_large() {
        let mut frame = Vec::new();
        let payload = vec![0u8; 70000];
        push_masked_len(&mut frame, payload.len());
        // 1 byte + 8 bytes extended length
        assert_eq!(frame.len(), 9);
        assert_eq!(frame[0] & 0x7F, 127); // 127 signals 64-bit length
    }

    #[test]
    fn ws_message_debug_variants() {
        let text = WsMessage::Text("hello".to_string());
        let binary = WsMessage::Binary(vec![1, 2, 3]);
        let close = WsMessage::Close;
        assert!(format!("{:?}", text).contains("Text"));
        assert!(format!("{:?}", binary).contains("Binary"));
        assert!(format!("{:?}", close).contains("Close"));
    }

    // Async WS state machine: liveness transitions of a registry entry.
    // dead (no client, no slot) → connecting (slot) → open (client) → dead.
    #[test]
    fn ws_entry_liveness_transitions() {
        let connecting = WsEntry {
            client: None,
            connect_slot: Some(Arc::new(Mutex::new(None))),
            close_requested: false,
            close_initiated: false,
            realm_global: ::std::ptr::null_mut(),
            js_obj_key: "ws_test".to_string(),
        };
        assert!(connecting.is_live(), "connecting entry is live");

        let dead = WsEntry {
            client: None,
            connect_slot: None,
            close_requested: false,
            close_initiated: false,
            realm_global: ::std::ptr::null_mut(),
            js_obj_key: "ws_test".to_string(),
        };
        assert!(
            !dead.is_live(),
            "dead entry (post-close/failure) is not live"
        );
    }

    // Stealth plumbing: the wss path consumes the exact same profile source
    // fetch() uses. `get_fetch_stealth_profile` must round-trip what
    // `set_fetch_stealth_profile` stored (default-None when unset).
    #[test]
    fn fetch_stealth_profile_getter_roundtrip() {
        let saved = crate::fetch_api::get_fetch_stealth_profile();
        crate::fetch_api::set_fetch_stealth_profile(Some(
            bao_stealth::StealthProfile::firefox_default(),
        ));
        let got = crate::fetch_api::get_fetch_stealth_profile();
        crate::fetch_api::set_fetch_stealth_profile(saved);
        let p = got.expect("profile must round-trip");
        assert!(
            !p.tls.cipher_suites.is_empty(),
            "firefox profile must carry cipher suites (wss stealth source)"
        );
    }
}