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clipboard.ts
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clipboard.ts
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/**
* Xpra Typescript Client
* @link https://github.com/andersevenrud/xpra-html5-client
* @author Anders Evenrud <andersevenrud@gmail.com>
* @license Mozilla Public License Version 2.0
*
* ---
*
* Based on original Xpra source
* @copyright Copyright (C) 2016-2022 Antoine Martin <antoine@devloop.org.uk>
* @license Licensed under MPL 2.0, see: http://www.mozilla.org/MPL/2.0/
* @link https://github.com/Xpra-org/xpra-html5
*/
import TypedEmitter from 'typed-emitter'
import EventEmitter from 'events'
import { uint8toString } from '../utils/data'
import { unescapeUri } from '../utils/data'
import { browserReadClipboard, browserWriteClipboard } from '../utils/clipboard'
import {
XpraPacketArguments,
XpraClipboardSelection,
XpraClipboardTarget,
XpraCapabilities,
XpraConnectionOptions,
XpraClipboardDirection,
} from '../types'
export type XpraClipboardEventEmitters = {
token: (data: string) => void
send: (
requestId: number,
selection: string,
buffer: string,
dataType?: string,
dataFormat?: number,
encoding?: string
) => void
}
/**
* Provides clipboard functionality to the Xpra client
* @noInheritDoc
*/
export class XpraClipboard extends (EventEmitter as unknown as new () => TypedEmitter<XpraClipboardEventEmitters>) {
private enabled = false
private direction: XpraClipboardDirection = 'both'
private clipboardBuffer: Partial<
Record<XpraClipboardSelection, XpraPacketArguments>
> = {}
configure(options: XpraConnectionOptions) {
this.enabled = options.clipboard
this.direction = options.clipboardDirection
}
reset() {
this.clipboardBuffer = {}
}
async write(
capabilities: XpraCapabilities,
selection: XpraClipboardSelection,
_targets: XpraClipboardTarget[],
target: XpraClipboardTarget,
type: XpraClipboardTarget,
format: number,
wireEncoding: string,
wireData: string | Uint8Array
) {
if (!this.enabled) {
return
}
if (arguments.length >= 7) {
this.clipboardBuffer[selection] = [wireData, type, format, wireEncoding]
}
const preferedTargets = capabilities['clipboard.preferred-targets']
const valid = target && preferedTargets.includes(target)
if (valid) {
let data = wireData
const isText = type.match(/text|string/i)
if (isText) {
if (data instanceof Uint8Array) {
data = uint8toString(data)
}
await browserWriteClipboard(data)
} else if (
type === 'image/png' &&
format === 8 &&
wireEncoding === 'bytes'
) {
await browserWriteClipboard(wireData as string, type)
}
}
}
async read(requestId: number, selection: XpraClipboardSelection) {
if (!this.enabled) {
return
}
const resend = () => {
const buffer = this.clipboardBuffer['CLIPBOARD']
if (buffer) {
const [data, type, format, encoding] = buffer
this.emit('send', requestId, selection, data, type, format, encoding)
}
}
if (selection !== 'CLIPBOARD') {
this.emit('send', requestId, selection, '')
return
}
try {
const result = await browserReadClipboard('UTF8_STRING')
const buffer = this.clipboardBuffer['PRIMARY']
if (
buffer &&
buffer[1] === 8 &&
buffer[2] === 'bytes' &&
result === buffer[3]
) {
resend()
} else if (result) {
const [type, data] = result
this.emit('send', requestId, selection, data, type)
}
} catch (e) {
resend()
console.error('XpraClipboard#read', e)
}
}
async poll() {
if (this.direction === 'to-server') {
return
}
const [, text] = await browserReadClipboard('UTF8_STRING')
const data = unescapeUri(text)
this.emit('token', data)
}
isEnabled() {
return this.enabled
}
setEnabled(enabled: boolean) {
this.enabled = enabled
}
}