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xdls.html
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<!doctype html>
<html>
<body>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/localforage/1.2.1/localforage.min.js"></script>
<script>
var PREFIX = 'xdls:';
localforage.config( {
size: 4000000, // safari seems to complain now with the default size so back off a bit
name: 'XDLS'
} );
function onLocalForageComplete( event, data, error, result ) {
if ( error ) {
event.source.postMessage( PREFIX + JSON.stringify( {
id: data.id,
error: 'localforage error',
message: error.message || error
} ), event.origin );
return;
}
event.source.postMessage( PREFIX + JSON.stringify( {
id: data.id,
result: result
} ), event.origin );
}
function onMessage( event ) {
if ( !event.data || !event.data.indexOf || event.data.indexOf( PREFIX ) !== 0 ) {
return;
}
// remove the xdls: header and parse
try {
var data = JSON.parse( event.data.substring( PREFIX.length ) );
}
catch( ex ) {
event.source.postMessage( PREFIX + JSON.stringify( {
error: 'invalid xdls message',
message: 'Could not parse xdls message: ' + event.data
} ), event.origin );
return;
}
var method = data.method;
if ( !localforage.hasOwnProperty( method ) ) {
event.source.postMessage( PREFIX + JSON.stringify( {
id: data.id,
error: 'invalid method',
message: 'Invalid xdls method specified: ' + method
} ), event.origin );
return;
}
try {
var arguments = data.arguments || [];
arguments.push( onLocalForageComplete.bind( null, event, data ) );
localforage[ method ].apply( localforage, data.arguments );
}
catch ( ex ) {
onLocalForageComplete( event, data, ex );
}
}
if( window.addEventListener ) {
window.addEventListener( 'message', onMessage, false );
}
else if ( window.attachEvent ) {
window.attachEvent( 'onmessage', onMessage );
}
</script>
</body>
</html>