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POCSP issue with createObjectURL on WebkitBlobBuilder
 

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  1. POCSP issue with createObjectURL on WebkitBlobBuilder
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    <p>I am facing an issue with CSP in my extension... </p> <p>I use a content script in order to change images on websites. My content script was adding his own images to websites so I had the following warning : </p> <pre><code>[Report Only] Refused to load image from 'chrome://extension/xxx/...' because of Content-Security-Policy. The page at https://plus.google.com/u/0/hot displayed insecure content from chrome://extension/xxx/.... </code></pre> <p>So I added the following line to my manifest : </p> <pre><code>"content_security_policy": "default-src *" </code></pre> <p>and the warning disappeared... </p> <p>Now, I need to modify images, to do that, I write them to a canvas, get the dataURL and convert it into a WebkitBlobBuilder to avoid the memory leak due to src change on img tag (with a blob, I can revoke it once it has been used and it freed the memory...) </p> <p>Part of the code : </p> <pre><code> //Code to create a blob from dataURI base.dataURItoBlob = function(dataURI, callback) { var byteString; if (dataURI.split(',')[0].indexOf('base64') &gt;= 0) byteString = atob(dataURI.split(',')[1]); else byteString = unescape(dataURI.split(',')[1]); var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]; var ab = new ArrayBuffer(byteString.length); var ia = new Uint8Array(ab); for (var i = 0; i &lt; byteString.length; i++) { ia[i] = byteString.charCodeAt(i); } var bb = new WebKitBlobBuilder(); bb.append(ab); return bb.getBlob(mimeString); }; //Code to display the blob on an image : //Write image on a canvas : base.ctx.putImageData(cData, img.leftPos, img.topPos); //Get a blob var blobData = base.dataURItoBlob(base.canvas.toDataURL("image/png")); //Create an URL from the blob var urlfile = window.webkitURL.createObjectURL(dataBlob); //set it on the img tag img.attr("src", urlfile); //Revoke the blob once loaded img.load(function() { window.webkitURL.revokeObjectURL(urlfile); }); </code></pre> <p>This code works great.... There is no more memory leak due to src change on my img tag. </p> <p>BUT I have this warning : </p> <pre><code>[Report Only] Refused to load image from 'blob:https%3A%2F %2Fplus.google.com/52ac1648-64d6-4fce-bb35-537d939d5007' because of Content-Security-Policy. The page at https://plus.google.com/u/0/hot displayed insecure content from blob:https%3A%2F%2Fplus.google.com/52ac1648-64d6-4fce- bb35-537d939d5007. </code></pre> <p>Why does the default-src from content policy does not applied to blobs ?? </p> <p>Thanks !</p>
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    1. USDuhoux Pierre-Louis
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    1. COSounds like this might be a bug in the CSP implementation, so far as I can tell, blobs should be recognized as a valid scheme: can you file a bug at http://new.crbug.com/?
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      1. USMike West
 

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