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index.html
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<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<script type="text/javascript">
let CLIPBOARD
let SET_CLIPBOARD
function SetClipboard () {
if (CLIPBOARD) {
let elem = document.createElement("textarea");
let success = false;
if (typeof(CLIPBOARD.payload) !== 'string')
CLIPBOARD.payload = JSON.stringify(
CLIPBOARD.payload, null, 4
)
elem.value = CLIPBOARD.payload;
document.body.appendChild(elem);
elem.focus();
elem.select();
try { success = !!document.execCommand("copy"); }
catch (err) {}
document.body.removeChild(elem);
if (window.parent !== window)
fetch('http://clipboard/message', {
"method": "POST",
"body": JSON.stringify({
type: 'SET_CLIPBOARD',
payload: success
})
})
CLIPBOARD = null
}
}
const ACTION_SETTING_CLIPBOARD = {
"method": "POST",
"body": JSON.stringify({
type: 'SETTING_CLIPBOARD',
payload: true
})
}
function onMessage (evt) {
if (!CLIPBOARD) {
if (evt.data && evt.data.type == 'SET_CLIPBOARD') {
CLIPBOARD = evt.data
fetch('http://clipboard/message', ACTION_SETTING_CLIPBOARD)
}
}
}
document.addEventListener('keypress', SetClipboard)
window.addEventListener('message', onMessage)
</script>
</body>
</html>