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<!doctype html>
<meta charset="utf8">
<title>Performs IndexedDB tasks in response to postMessage</title>
<script>
'use strict';
self.addEventListener('message', async event => {
const action = event.data.action;
let response = null;
switch(action) {
case 'get-database-names': {
const dbInfos = await self.indexedDB.databases();
response = dbInfos.map(dbInfo => dbInfo.name);
break;
}
case 'delete-database': {
const dbName = event.data.name;
await new Promise((resolve, reject) => {
const request = indexedDB.deleteDatabase(dbName);
request.onsuccess = resolve;
request.onerror = reject;
});
response = true;
break;
}
}
event.source.postMessage({ action, response }, event.origin);
window.close();
});
// Make up for the fact that the opener of a cross-origin window has no way of
// knowing when the window finishes loading.
if (window.opener !== null) {
window.opener.postMessage({ action: null, response: 'ready' }, '*');
}
</script>
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