<pre id="console"></pre>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}

log = function(msg)
{
    document.getElementById('console').appendChild(document.createTextNode(msg + "\n"));
}

testTexImage2D = function(gl, source, description)
{
    description = "Calling texImage2D() with a tainted " + description;
    try {
        gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, source);
        log("FAIL: " + description + " was allowed");
    } catch (e) {
        log("PASS: " + description + " was not allowed: Threw error: " + e + ".");
    }
}

testReadPixels = function(gl, description)
{
    description = "Calling readPixels() on a canvas where tainting was attempted by a " + description;
    try {
        var pixels = new Uint8Array(4);
        gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
        log("PASS: " + description + " was allowed.");
    } catch (e) {
        log("FAIL: " + description + " was not allowed - Threw error: " + e + ".");
    }
}

testToDataURL = function(canvas, description)
{
    description = "Calling toDataURL() on a canvas where tainting was attempted by a " + description;
    try {
        var dataURL = canvas.toDataURL();
        log("PASS: " + description + " was allowed.");
    } catch (e) {
        log("FAIL: " + description + " was not allowed - Threw error: " + e + ".");
    }
}

test = function(canvas, description)
{
    testReadPixels(canvas.getContext("experimental-webgl"), description);
    testToDataURL(canvas, description);
}

var image = new Image();
image.onload = function() {
    var canvas = document.createElement("canvas");
    canvas.width = 100;
    canvas.height = 100;
    var gl = canvas.getContext("experimental-webgl");

    // Control tests
    log("Untainted canvas:");
    try {
        var pixels = new Uint8Array(4);
        gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
        log("PASS: Calling readPixels() from an untainted canvas was allowed.");
    } catch (e) {
        log("FAIL: Calling readPixels() from an untainted canvas was not allowed: Threw error: " + e + ".");
    }
    try {
        var dataURL = canvas.toDataURL();
        log("PASS: Calling toDataURL() on an untainted canvas was allowed.");
    } catch (e) {
        log("FAIL: Calling toDataURL() on an untainted canvas was not allowed: Threw error: " + e + ".");
    }

    log("\n");
    log("Tainted canvas:");
    // Test reading from a canvas after uploading a remote image as a texture
    var texture = gl.createTexture();
    gl.bindTexture(gl.TEXTURE_2D, texture);
    testTexImage2D(gl, image, "image");

    test(canvas, "remote image");

    var dirtyCanvas = canvas;

    // Now test reading from a canvas after drawing a tainted canvas onto it
    var dirtyCanvas = document.createElement("canvas");
    dirtyCanvas.width = 100;
    dirtyCanvas.height = 100;
    var dirtyContext = dirtyCanvas.getContext("2d");
    dirtyContext.drawImage(image, 0, 0, 100, 100);
    testTexImage2D(gl, dirtyCanvas, "canvas");

    test(canvas, "tainted canvas");

    if (window.testRunner)
        testRunner.notifyDone();
}
// Notice that we forget to set the image.crossOrigin property!
image.src = "http://localhost:8000/security/resources/abe-allow-star.php";
</script>