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denoland-deno/runtime/ops/websocket.rs

328 lines
9 KiB
Rust

// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use crate::permissions::Permissions;
use deno_core::error::bad_resource_id;
use deno_core::error::type_error;
use deno_core::error::AnyError;
use deno_core::futures::stream::SplitSink;
use deno_core::futures::stream::SplitStream;
use deno_core::futures::SinkExt;
use deno_core::futures::StreamExt;
use deno_core::serde_json::json;
use deno_core::serde_json::Value;
use deno_core::url;
use deno_core::AsyncRefCell;
use deno_core::BufVec;
use deno_core::CancelFuture;
use deno_core::CancelHandle;
use deno_core::OpState;
use deno_core::RcRef;
use deno_core::Resource;
use deno_core::{serde_json, ZeroCopyBuf};
use http::{Method, Request, Uri};
use serde::Deserialize;
use std::borrow::Cow;
use std::cell::RefCell;
use std::fs::File;
use std::io::BufReader;
use std::rc::Rc;
use std::sync::Arc;
use tokio::net::TcpStream;
use tokio_rustls::{rustls::ClientConfig, TlsConnector};
use tokio_tungstenite::stream::Stream as StreamSwitcher;
use tokio_tungstenite::tungstenite::Error as TungsteniteError;
use tokio_tungstenite::tungstenite::{
handshake::client::Response, protocol::frame::coding::CloseCode,
protocol::CloseFrame, Message,
};
use tokio_tungstenite::{client_async, WebSocketStream};
use webpki::DNSNameRef;
#[derive(Clone)]
struct WsCaFile(String);
#[derive(Clone)]
struct WsUserAgent(String);
pub fn init(
rt: &mut deno_core::JsRuntime,
maybe_ca_file: Option<&str>,
user_agent: String,
) {
{
let op_state = rt.op_state();
let mut state = op_state.borrow_mut();
if let Some(ca_file) = maybe_ca_file {
state.put::<WsCaFile>(WsCaFile(ca_file.to_string()));
}
state.put::<WsUserAgent>(WsUserAgent(user_agent));
}
super::reg_json_sync(rt, "op_ws_check_permission", op_ws_check_permission);
super::reg_json_async(rt, "op_ws_create", op_ws_create);
super::reg_json_async(rt, "op_ws_send", op_ws_send);
super::reg_json_async(rt, "op_ws_close", op_ws_close);
super::reg_json_async(rt, "op_ws_next_event", op_ws_next_event);
}
type MaybeTlsStream =
StreamSwitcher<TcpStream, tokio_rustls::client::TlsStream<TcpStream>>;
type WsStream = WebSocketStream<MaybeTlsStream>;
struct WsStreamResource {
tx: AsyncRefCell<SplitSink<WsStream, Message>>,
rx: AsyncRefCell<SplitStream<WsStream>>,
// When a `WsStreamResource` resource is closed, all pending 'read' ops are
// canceled, while 'write' ops are allowed to complete. Therefore only
// 'read' futures are attached to this cancel handle.
cancel: CancelHandle,
}
impl Resource for WsStreamResource {
fn name(&self) -> Cow<str> {
"webSocketStream".into()
}
}
impl WsStreamResource {}
#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct CheckPermissionArgs {
url: String,
}
// This op is needed because creating a WS instance in JavaScript is a sync
// operation and should throw error when permissions are not fullfiled,
// but actual op that connects WS is async.
pub fn op_ws_check_permission(
state: &mut OpState,
args: Value,
_zero_copy: &mut [ZeroCopyBuf],
) -> Result<Value, AnyError> {
let args: CheckPermissionArgs = serde_json::from_value(args)?;
state
.borrow::<Permissions>()
.check_net_url(&url::Url::parse(&args.url)?)?;
Ok(json!({}))
}
#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct CreateArgs {
url: String,
protocols: String,
}
pub async fn op_ws_create(
state: Rc<RefCell<OpState>>,
args: Value,
_bufs: BufVec,
) -> Result<Value, AnyError> {
let args: CreateArgs = serde_json::from_value(args)?;
{
let s = state.borrow();
s.borrow::<Permissions>()
.check_net_url(&url::Url::parse(&args.url)?)
.expect(
"Permission check should have been done in op_ws_check_permission",
);
}
let maybe_ca_file = state.borrow().try_borrow::<WsCaFile>().cloned();
let user_agent = state.borrow().borrow::<WsUserAgent>().0.clone();
let uri: Uri = args.url.parse()?;
let mut request = Request::builder().method(Method::GET).uri(&uri);
request = request.header("User-Agent", user_agent);
if !args.protocols.is_empty() {
request = request.header("Sec-WebSocket-Protocol", args.protocols);
}
let request = request.body(())?;
let domain = &uri.host().unwrap().to_string();
let port = &uri.port_u16().unwrap_or(match uri.scheme_str() {
Some("wss") => 443,
Some("ws") => 80,
_ => unreachable!(),
});
let addr = format!("{}:{}", domain, port);
let try_socket = TcpStream::connect(addr).await;
let tcp_socket = match try_socket.map_err(TungsteniteError::Io) {
Ok(socket) => socket,
Err(_) => return Ok(json!({"success": false})),
};
let socket: MaybeTlsStream = match uri.scheme_str() {
Some("ws") => StreamSwitcher::Plain(tcp_socket),
Some("wss") => {
let mut config = ClientConfig::new();
config
.root_store
.add_server_trust_anchors(&webpki_roots::TLS_SERVER_ROOTS);
if let Some(ws_ca_file) = maybe_ca_file {
let key_file = File::open(ws_ca_file.0)?;
let reader = &mut BufReader::new(key_file);
config.root_store.add_pem_file(reader).unwrap();
}
let tls_connector = TlsConnector::from(Arc::new(config));
let dnsname =
DNSNameRef::try_from_ascii_str(&domain).expect("Invalid DNS lookup");
let tls_socket = tls_connector.connect(dnsname, tcp_socket).await?;
StreamSwitcher::Tls(tls_socket)
}
_ => unreachable!(),
};
let (stream, response): (WsStream, Response) =
client_async(request, socket).await.map_err(|err| {
type_error(format!(
"failed to connect to WebSocket: {}",
err.to_string()
))
})?;
let (ws_tx, ws_rx) = stream.split();
let resource = WsStreamResource {
rx: AsyncRefCell::new(ws_rx),
tx: AsyncRefCell::new(ws_tx),
cancel: Default::default(),
};
let mut state = state.borrow_mut();
let rid = state.resource_table.add(resource);
let protocol = match response.headers().get("Sec-WebSocket-Protocol") {
Some(header) => header.to_str().unwrap(),
None => "",
};
let extensions = response
.headers()
.get_all("Sec-WebSocket-Extensions")
.iter()
.map(|header| header.to_str().unwrap())
.collect::<String>();
Ok(json!({
"success": true,
"rid": rid,
"protocol": protocol,
"extensions": extensions
}))
}
#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct SendArgs {
rid: u32,
text: Option<String>,
}
pub async fn op_ws_send(
state: Rc<RefCell<OpState>>,
args: Value,
bufs: BufVec,
) -> Result<Value, AnyError> {
let args: SendArgs = serde_json::from_value(args)?;
let msg = match args.text {
Some(text) => Message::Text(text),
None => Message::Binary(bufs[0].to_vec()),
};
let rid = args.rid;
let resource = state
.borrow_mut()
.resource_table
.get::<WsStreamResource>(rid)
.ok_or_else(bad_resource_id)?;
let mut tx = RcRef::map(&resource, |r| &r.tx).borrow_mut().await;
tx.send(msg).await?;
Ok(json!({}))
}
#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct CloseArgs {
rid: u32,
code: Option<u16>,
reason: Option<String>,
}
pub async fn op_ws_close(
state: Rc<RefCell<OpState>>,
args: Value,
_bufs: BufVec,
) -> Result<Value, AnyError> {
let args: CloseArgs = serde_json::from_value(args)?;
let rid = args.rid;
let msg = Message::Close(args.code.map(|c| CloseFrame {
code: CloseCode::from(c),
reason: match args.reason {
Some(reason) => Cow::from(reason),
None => Default::default(),
},
}));
let resource = state
.borrow_mut()
.resource_table
.get::<WsStreamResource>(rid)
.ok_or_else(bad_resource_id)?;
let mut tx = RcRef::map(&resource, |r| &r.tx).borrow_mut().await;
tx.send(msg).await?;
Ok(json!({}))
}
#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct NextEventArgs {
rid: u32,
}
pub async fn op_ws_next_event(
state: Rc<RefCell<OpState>>,
args: Value,
_bufs: BufVec,
) -> Result<Value, AnyError> {
let args: NextEventArgs = serde_json::from_value(args)?;
let resource = state
.borrow_mut()
.resource_table
.get::<WsStreamResource>(args.rid)
.ok_or_else(bad_resource_id)?;
let mut rx = RcRef::map(&resource, |r| &r.rx).borrow_mut().await;
let cancel = RcRef::map(resource, |r| &r.cancel);
let val = rx.next().or_cancel(cancel).await?;
let res = match val {
Some(Ok(Message::Text(text))) => json!({
"type": "string",
"data": text
}),
Some(Ok(Message::Binary(data))) => {
// TODO(ry): don't use json to send binary data.
json!({
"type": "binary",
"data": data
})
}
Some(Ok(Message::Close(Some(frame)))) => json!({
"type": "close",
"code": u16::from(frame.code),
"reason": frame.reason.as_ref()
}),
Some(Ok(Message::Close(None))) => json!({ "type": "close" }),
Some(Ok(Message::Ping(_))) => json!({"type": "ping"}),
Some(Ok(Message::Pong(_))) => json!({"type": "pong"}),
Some(Err(_)) => json!({"type": "error"}),
None => {
state.borrow_mut().resource_table.close(args.rid).unwrap();
json!({"type": "closed"})
}
};
Ok(res)
}