<!DOCTYPE html>
<html>
<body>
<canvas id="canvas">
<img id="img" onload="drawInCanvas()"></img>
<script>
var test = JSON.parse(decodeURIComponent(location.hash.substring(1)));

function logError()
{
    parent.postMessage((!test.shouldPass ? "PASS": "FAIL") + ": The image is not same-origin with this document.", "*");
}

function logPass()
{
    parent.postMessage((test.shouldPass ? "PASS": "FAIL") + ": Successfully retrieved image data.", "*");
}

function drawInCanvas()
{
    var canvas = document.getElementById('canvas');
    var ctx = canvas.getContext('2d');
    ctx.drawImage(document.getElementById('img'), 0, 0);

    // Grab a pixel to verify that the image is same-origin:
    try {
        var pixel = ctx.getImageData(0, 0, 1, 1);
        logPass();
    } catch (e) {
        logError();
    }
}

var node = document.getElementById(test.node);
node.src = test.url;
</script>
</body>
</html>