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feat: support resizing and other xterm.js addons

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This commit is contained in:
Aarnav Tale
2025-05-31 16:41:07 -04:00
parent a0a80852eb
commit ccde3513dc
8 changed files with 282 additions and 30 deletions
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app/server/agent/encoder.ts
+6 -14
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@@ -13,7 +13,7 @@ export type ChannelType = 0 | 1 | 2;
interface SSHFrame {
sessionId: string;
channel: ChannelType;
payload: Blob | ArrayBufferLike | string;
payload: Buffer;
}
export async function encodeSSHFrame(frame: SSHFrame) {
@@ -23,17 +23,9 @@ export async function encodeSSHFrame(frame: SSHFrame) {
return;
}
const payload = Buffer.isBuffer(frame.payload)
? frame.payload
: typeof frame.payload === 'string'
? Buffer.from(frame.payload, 'utf8')
: frame.payload instanceof Blob
? Buffer.from(await frame.payload.arrayBuffer())
: Buffer.from(frame.payload);
// Size can only hold 4 bytes
if (payload.length > 0xffffffff) {
log.error('agent', 'SSH payload too large: %d bytes', payload.length);
if (frame.payload.length > 0xffffffff) {
log.error('agent', 'SSH payload too large: %d bytes', frame.payload.length);
return;
}
@@ -42,7 +34,7 @@ export async function encodeSSHFrame(frame: SSHFrame) {
1 + // Version
1 + // Channel Type
(1 + sid.length) + // Session ID length + SID
(4 + payload.length); // Payload length + Payload
(4 + frame.payload.length); // Payload length + Payload
const buf = Buffer.alloc(frameSize);
buf.write(MAGIC, 0, 'utf8');
@@ -53,8 +45,8 @@ export async function encodeSSHFrame(frame: SSHFrame) {
const offset = 7 + sid.length;
sid.copy(buf, 7);
buf.writeUInt32BE(payload.length, offset);
payload.copy(buf, offset + 4);
buf.writeUInt32BE(frame.payload.length, offset);
frame.payload.copy(buf, offset + 4);
return buf;
}