brcontainer/html2canvas-php-proxy

Cross domain and SVG not work

brcontainer opened this issue · 1 comments

brcontainer commented

Note: This question/issue has been established to guide proxy servers.

If my html/script is on a domain like this http://www.example.com and the proxy in another like this http://proxy.example.com (or http://www.example2.com) the script fails to convert the images to canvas, see example:

<script>
//<![CDATA[
(function() {
    window.onload = function(){
        html2canvas(document.body, {
            "logging": true, //Enable log (use Web Console for get Errors and Warnings)
            "proxy":"http://proxy.example.com/html2canvasproxy.php", //or  "proxy":"http://www.example2.com/html2canvasproxy.php"
            "onrendered": function(canvas) {
                var img = new Image();
                img.onload = function() {
                    img.onload = null;
                    document.body.appendChild(img);
                };
                img.src = canvas.toDataURL("image/png");
            }
        });
    };
})();
//]]>
</script>

Script show this error:

Uncaught SecurityError: Failed to execute 'toDataURL' on 'HTMLCanvasElement': tainted canvases may not be exported.

And the proxy don't support SVG images.