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import { bind } from 'decko';
import { h, Component } from 'preact';
import { saveAs } from 'file-saver';
import { IDisposable, ITerminalAddon, Terminal } from 'xterm';
import * as Zmodem from 'zmodem.js/src/zmodem_browser';
import { Modal } from '../modal';
export interface FlowControl {
limit: number;
highWater: number;
lowWater: number;
pause: () => void;
resume: () => void;
}
interface Props {
sender: (data: ArrayLike<number>) => void;
control: FlowControl;
}
interface State {
modal: boolean;
}
export class ZmodemAddon extends Component<Props, State> implements ITerminalAddon {
private terminal: Terminal | undefined;
private keyDispose: IDisposable | undefined;
private sentry: Zmodem.Sentry;
private session: Zmodem.Session;
private written = 0;
private pending = 0;
constructor(props: Props) {
super(props);
this.zmodemInit();
}
render(_, { modal }: State) {
return (
<Modal show={modal}>
<label class="file-label">
<input onChange={this.sendFile} class="file-input" type="file" multiple />
<span class="file-cta">Choose files…</span>
</label>
</Modal>
);
}
activate(terminal: Terminal): void {
this.terminal = terminal;
}
dispose(): void {}
consume(data: ArrayBuffer) {
const { sentry, handleError } = this;
try {
sentry.consume(data);
} catch (e) {
handleError(e, 'consume');
}
}
@bind
private handleError(e: Error, reason: string) {
console.error(`[ttyd] zmodem ${reason}: `, e);
this.zmodemReset();
}
@bind
private zmodemInit() {
this.session = null;
this.sentry = new Zmodem.Sentry({
to_terminal: (octets: ArrayBuffer) => this.zmodemWrite(octets),
sender: (octets: ArrayLike<number>) => this.zmodemSend(octets),
on_retract: () => this.zmodemReset(),
on_detect: (detection: Zmodem.Detection) => this.zmodemDetect(detection),
});
}
@bind
private zmodemReset() {
this.terminal.setOption('disableStdin', false);
if (this.keyDispose) {
this.keyDispose.dispose();
this.keyDispose = null;
}
this.zmodemInit();
this.terminal.focus();
}
@bind
private zmodemWrite(data: ArrayBuffer): void {
const { limit, highWater, lowWater, pause, resume } = this.props.control;
const { terminal } = this;
const rawData = new Uint8Array(data);
this.written += rawData.length;
if (this.written > limit) {
terminal.write(rawData, () => {
this.pending = Math.max(this.pending - 1, 0);
if (this.pending < lowWater) {
resume();
}
});
this.pending++;
this.written = 0;
if (this.pending > highWater) {
pause();
}
} else {
terminal.write(rawData);
}
}
@bind
private zmodemSend(data: ArrayLike<number>): void {
this.props.sender(data);
}
@bind
private zmodemDetect(detection: Zmodem.Detection): void {
const { terminal, receiveFile, zmodemReset } = this;
terminal.setOption('disableStdin', true);
this.keyDispose = terminal.onKey(e => {
const event = e.domEvent;
if (event.ctrlKey && event.key === 'c') {
detection.deny();
}
});
this.session = detection.confirm();
this.session.on('session_end', zmodemReset);
if (this.session.type === 'send') {
this.setState({ modal: true });
} else {
receiveFile();
}
}
@bind
private sendFile(event: Event) {
this.setState({ modal: false });
const { session, writeProgress, handleError } = this;
const files: FileList = (event.target as HTMLInputElement).files;
Zmodem.Browser.send_files(session, files, {
on_progress: (_, offer: Zmodem.Offer) => writeProgress(offer),
})
.then(() => session.close())
.catch(e => handleError(e, 'send'));
}
@bind
private receiveFile() {
const { session, writeProgress, handleError } = this;
session.on('offer', (offer: Zmodem.Offer) => {
const fileBuffer = [];
offer.on('input', payload => {
writeProgress(offer);
fileBuffer.push(new Uint8Array(payload));
});
offer
.accept()
.then(() => {
const blob = new Blob(fileBuffer, { type: 'application/octet-stream' });
saveAs(blob, offer.get_details().name);
})
.catch(e => handleError(e, 'receive'));
});
session.start();
}
@bind
private writeProgress(offer: Zmodem.Offer) {
const { terminal, 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);
terminal.write(`${name} ${percent}% ${bytesHuman(offset, 2)}/${bytesHuman(size, 2)}\r`);
}
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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