You'll need to use the javascript FormData
object and native XMLHttpRequest
methods to post the data directly to s3. I've tried to do the exact same thing this morning with jQuery and ran into that error message, but native javascript APIs work.
I have a feeling jQuery isn't using CORS by default or is sending across a the wrong header somewhere.
This answer shows how to convert to a format S3 can understand, which may not be necessary in your case.
This should get you started on the form data part:
var fd = new FormData();
fd.append("contentType", "image/jpeg");
fd.append("key", key);
fd.append("AWSAccessKeyId", awsAccessKey);
fd.append("acl", "public-read");
fd.append("policy", policy);
fd.append("signature", signature);
fd.append('filename', "");
fd.append('file', raw);
var xhr = new XMLHttpRequest();
xhr.open('POST', amazonUploadUrl);
xhr.addEventListener('load', function(e) {
console.log('uploaded!', e) // Successful upload!
});
// Optionally bind to other xhr events, like error, progress, or abort.
// Using native XHR2 is nice because the progress event works and you
// can tack on upload progress counters.
xhr.send(fd);