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I’m using jsOauth-twitter to upload an image to twitter which calls the update_with_media api method. It looks like it needs the actual image data. This is already on my webpage inside a normal <img src="localfile"> tag.
Using Javascript, can I get at the actual image data (JPEG) to pass it to the function? Is it available in the DOM? I need the raw image data so I can pass it to twitter as application/octet-stream, so base64 is no good to me.
It looks like the API requires the form to be sent as multipart/form-data, which means the media[] parameter is expecting a file rather than binary or base64 encoded data. If you use HTML file input inside a form, this should be fairly straightward.
If you must use the <img> tag, then it would be difficult. All I can think of is draw the image to a <canvas>, obtain a base64-encoded URI with
toDataURI(), decode it to obtain the raw image data using window.atob(), then build the multipart/form-data POST body manually. This answer has some sample code for the first couple of things.The
BlobAPI may help in creating a file-like object which your OAuth library can accept (rather than manually building the request body), but its not very well supported yet.