code-server/protocol.ts

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import * as crypto from "crypto";
import * as net from "net";
import { VSBuffer } from "vs/base/common/buffer";
import { NodeSocket, WebSocketNodeSocket } from "vs/base/parts/ipc/node/ipc.net";
import { PersistentProtocol } from "vs/base/parts/ipc/common/ipc.net";
import { AuthRequest, ConnectionTypeRequest, HandshakeMessage } from "vs/platform/remote/common/remoteAgentConnection";
export interface SocketOptions {
readonly reconnectionToken: string;
readonly reconnection: boolean;
readonly skipWebSocketFrames: boolean;
}
export class Protocol extends PersistentProtocol {
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private disposed: boolean = false;
public constructor(
secWebsocketKey: string,
socket: net.Socket,
public readonly options: SocketOptions,
) {
super(
options.skipWebSocketFrames
? new NodeSocket(socket)
: new WebSocketNodeSocket(new NodeSocket(socket)),
);
socket.on("error", () => this.dispose());
socket.on("end", () => this.dispose());
// This magic value is specified by the websocket spec.
const magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
const reply = crypto.createHash("sha1")
.update(secWebsocketKey + magic)
.digest("base64");
socket.write([
"HTTP/1.1 101 Switching Protocols",
"Upgrade: websocket",
"Connection: Upgrade",
`Sec-WebSocket-Accept: ${reply}`,
].join("\r\n") + "\r\n\r\n");
}
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public sendDisconnect(): void {
if (!this.disposed) {
super.sendDisconnect();
}
}
public dispose(error?: Error): void {
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if (!this.disposed) {
this.disposed = true;
if (error) {
this.sendMessage({ type: "error", reason: error.message });
}
super.dispose();
this.getSocket().dispose();
}
}
/**
* Perform a handshake to get a connection request.
*/
public handshake(): Promise<ConnectionTypeRequest> {
return new Promise((resolve, reject) => {
const handler = this.onControlMessage((rawMessage) => {
try {
const message = JSON.parse(rawMessage.toString());
switch (message.type) {
case "auth": return this.authenticate(message);
case "connectionType":
handler.dispose();
return resolve(message);
default: throw new Error("Unrecognized message type");
}
} catch (error) {
handler.dispose();
reject(error);
}
});
});
}
/**
* TODO: This ignores the authentication process entirely for now.
*/
private authenticate(_message: AuthRequest): void {
this.sendMessage({
type: "sign",
data: "",
});
}
/**
* TODO: implement.
*/
public tunnel(): void {
throw new Error("Tunnel is not implemented yet");
}
/**
* Send a handshake message. In the case of the extension host, it just sends
* back a debug port.
*/
public sendMessage(message: HandshakeMessage | { debugPort?: number } ): void {
this.sendControl(VSBuffer.fromString(JSON.stringify(message)));
}
}