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import { bind } from 'decko';
import { saveAs } from 'file-saver';
import { IDisposable, ITerminalAddon, Terminal } from 'xterm';
import * as Zmodem from 'zmodem.js/src/zmodem_browser';
import { TrzszFilter } from 'trzsz';
export interface ZmodeOptions {
zmodem: boolean;
trzsz: boolean;
windows: boolean;
onSend: () => void;
sender: (data: string | Uint8Array) => void;
writer: (data: string | Uint8Array) => void;
}
export class ZmodemAddon implements ITerminalAddon {
private disposables: IDisposable[] = [];
private terminal: Terminal;
private sentry: Zmodem.Sentry;
private session: Zmodem.Session;
private denier: () => void;
private trzszFilter: TrzszFilter;
constructor(private options: ZmodeOptions) {}
activate(terminal: Terminal) {
this.terminal = terminal;
if (this.options.zmodem) this.zmodemInit();
if (this.options.trzsz) this.trzszInit();
}
dispose() {
for (const d of this.disposables) {
d.dispose();
}
this.disposables.length = 0;
}
consume(data: ArrayBuffer) {
try {
if (this.options.trzsz) {
this.trzszFilter.processServerOutput(data);
} else {
this.sentry.consume(data);
}
} catch (e) {
console.error('[ttyd] zmodem consume: ', e);
this.reset();
}
}
@bind
private reset() {
this.terminal.options.disableStdin = false;
this.terminal.focus();
}
private addDisposableListener(target: EventTarget, type: string, listener: EventListener) {
target.addEventListener(type, listener);
this.disposables.push({ dispose: () => target.removeEventListener(type, listener) });
}
@bind
private trzszInit() {
const { terminal } = this;
const { sender, writer, zmodem } = this.options;
this.trzszFilter = new TrzszFilter({
writeToTerminal: data => {
if (!this.trzszFilter.isTransferringFiles() && zmodem) {
this.sentry.consume(data);
} else {
writer(typeof data === 'string' ? data : new Uint8Array(data as ArrayBuffer));
}
},
sendToServer: data => sender(data),
terminalColumns: terminal.cols,
isWindowsShell: this.options.windows,
});
const element = terminal.element as EventTarget;
this.addDisposableListener(element, 'dragover', event => event.preventDefault());
this.addDisposableListener(element, 'drop', event => {
event.preventDefault();
this.trzszFilter
.uploadFiles((event as DragEvent).dataTransfer?.items as DataTransferItemList)
.then(() => console.log('[ttyd] upload success'))
.catch(err => console.log('[ttyd] upload failed: ' + err));
});
this.disposables.push(terminal.onResize(size => this.trzszFilter.setTerminalColumns(size.cols)));
}
@bind
private zmodemInit() {
const { sender, writer } = this.options;
const { terminal, reset, zmodemDetect } = this;
this.session = null;
this.sentry = new Zmodem.Sentry({
to_terminal: octets => writer(new Uint8Array(octets)),
sender: octets => sender(new Uint8Array(octets)),
on_retract: () => reset(),
on_detect: detection => zmodemDetect(detection),
});
this.disposables.push(
terminal.onKey(e => {
const event = e.domEvent;
if (event.ctrlKey && event.key === 'c') {
if (this.denier) this.denier();
}
})
);
}
@bind
private zmodemDetect(detection: Zmodem.Detection): void {
const { terminal, receiveFile } = this;
terminal.options.disableStdin = true;
this.denier = () => detection.deny();
this.session = detection.confirm();
this.session.on('session_end', () => this.reset());
if (this.session.type === 'send') {
this.options.onSend();
} else {
receiveFile();
}
}
@bind
public sendFile(files: FileList) {
const { session, writeProgress } = this;
Zmodem.Browser.send_files(session, files, {
on_progress: (_, offer) => writeProgress(offer),
})
.then(() => session.close())
.catch(() => this.reset());
}
@bind
private receiveFile() {
const { session, writeProgress } = this;
session.on('offer', offer => {
offer.on('input', () => writeProgress(offer));
offer
.accept()
.then(payloads => {
const blob = new Blob(payloads, { type: 'application/octet-stream' });
saveAs(blob, offer.get_details().name);
})
.catch(() => this.reset());
});
session.start();
}
@bind
private writeProgress(offer: Zmodem.Offer) {
const { bytesHuman } = this;
const file = offer.get_details();
const name = file.name;
const size = file.size;
const offset = offer.get_offset();
const percent = ((100 * offset) / size).toFixed(2);
this.options.writer(`${name} ${percent}% ${bytesHuman(offset, 2)}/${bytesHuman(size, 2)}\r`);
}
// eslint-disable-next-line @typescript-eslint/no-explicit-any
private bytesHuman(bytes: any, precision: number): string {
if (!/^([-+])?|(\.\d+)(\d+(\.\d+)?|(\d+\.)|Infinity)$/.test(bytes)) {
return '-';
}
if (bytes === 0) return '0';
if (typeof precision === 'undefined') precision = 1;
const units = ['bytes', 'KB', 'MB', 'GB', 'TB', 'PB'];
const num = Math.floor(Math.log(bytes) / Math.log(1024));
const value = (bytes / Math.pow(1024, Math.floor(num))).toFixed(precision);
return `${value} ${units[num]}`;
}
}
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