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POUploading an image to Picasa from a Chrome Extension
 

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  1. POUploading an image to Picasa from a Chrome Extension
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    <p>I'm trying to upload an image to Picasa from a Google Chrome Extension and running into some trouble constructing the POST.</p> <p>This is the protocol google specifies for uploading an image to Picasa (<a href="http://code.google.com/apis/picasaweb/docs/2.0/developers_guide_protocol.html#PostPhotos">link</a>):</p> <pre><code>Content-Type: multipart/related; boundary="END_OF_PART" Content-Length: 423478347 MIME-version: 1.0 Media multipart posting --END_OF_PART Content-Type: application/atom+xml &lt;entry xmlns='http://www.w3.org/2005/Atom'&gt; &lt;title&gt;plz-to-love-realcat.jpg&lt;/title&gt; &lt;summary&gt;Real cat wants attention too.&lt;/summary&gt; &lt;category scheme="http://schemas.google.com/g/2005#kind" term="http://schemas.google.com/photos/2007#photo"/&gt; &lt;/entry&gt; --END_OF_PART Content-Type: image/jpeg ...binary image data... --END_OF_PART-- </code></pre> <p>And this is what I've cobbled together to attempt to do that, borrowing code from <a href="http://code.google.com/p/grecipes/source/browse/js/gdocs.js">here</a> and the extension "clip-it-good":</p> <pre><code>function handleMenuClick(albumName, albumId, data, tab) { chrome.pageAction.setTitle({ tabId: tab.id, title: 'Uploading (' + data.srcUrl.substr(0, 100) + ')' }); chrome.pageAction.show(tab.id); var img = document.createElement('img'); img.onload = function() { var canvas = document.createElement('canvas'); canvas.width = img.width; canvas.height = img.height; canvas.getContext('2d').drawImage(img, 0, 0); var dataUrl = canvas.toDataURL(); var dataUrlAdjusted = dataUrl.replace('data:image/png;base64,', ''); var builder = new WebKitBlobBuilder(); builder.append(Base64.decode(dataUrlAdjusted).buffer); function complete(resp, xhr) { chrome.pageAction.hide(tab.id); if (!(xhr.status &gt;= 200 &amp;&amp; xhr.status &lt;= 299)) { alert('Error: Response status = ' + xhr.status + ', response body = "' + xhr.responseText + '"'); } } // end complete OAUTH.authorize(function() { OAUTH.sendSignedRequest( 'http://picasaweb.google.com/data/feed/api/' + 'user/default/albumid/' + albumId, complete, { method: 'POST', headers: { 'Content-Type': 'multipart/related; boundary=END_OF_PART', 'MIME-version': '1.0' }, parameters: { alt: 'json' }, body: constructContentBody_('title.jpg', 'photo', builder.getBlob('image/png'), 'image/jpeg', 'lolz') } ); }); } // end onload img.src = data.srcUrl; } function constructAtomXml_(docTitle, docType, docSummary) { var atom = ['&lt;entry xmlns="http://www.w3.org/2005/Atom"&gt;', '&lt;title&gt;', docTitle, '&lt;/title&gt;', '&lt;summary&gt;', docSummary, '&lt;/summary&gt;', '&lt;category scheme="http://schemas.google.com/g/2005#kind"', ' term="http://schemas.google.com/docs/2007#', docType, '"/&gt;', '&lt;/entry&gt;'].join(''); return atom; }; function constructContentBody_(title, docType, body, contentType, summary) { var body_ = ['--END_OF_PART\r\n', 'Content-Type: application/atom+xml;\r\n\r\n', constructAtomXml_(title, docType, summary), '\r\n', '--END_OF_PART\r\n', 'Content-Type: ', contentType, '\r\n\r\n', eval(body), '\r\n', '--END_OF_PART--\r\n'].join(''); return body_; }; </code></pre> <p>This returns "Error: Response status = 400, response body = "Invalid kind on entry.""</p> <p>I'm not sure if I'm doing something wrong with WebKitBlobBuilder or if my POST is improperly formed. Any suggestions would be welcome!</p>
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    1. USMatt Sweeney
    1. USMatt Sweeney
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    1. COI guess the problem is that the server expect: Content-Type: image/jpeg and you are giving it base64...
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      1. USIdo Green
    2. COI might be missing something, but why do you have `builder.getBlob('image/png')` when the content type elsewhere is jpeg?
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      1. USSam Dutton
 

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