Error loading file on S3 with assigned URL using jQuery

Question

We are trying to upload a file to S3 using jQuery ajax and the assigned URL. We generate the assigned URL on the server. We are currently trying to use FormData to upload a file.

var uploadData = new FormData(), files = $(this.input).prop('files'), file = files[0]; uploadData.append('file', file); $.ajax({ url: '{presigned url string}', type: 'PUT', data: uploadData, cache: false, processData: false, contentType: false, success: function(response) { console.log('S3 upload success!'); }, error: function(response) { console.log('Error with S3 upload: ' + response.statusText); } }); 

This returns a SignatureDoesNotMatch error from AWS:

 <Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message><StringToSignBytes>50 55 54 0a 0a 6d 75 6c 74 69 70 61 72 74 2f 66 6f 72 6d 2d 64 61 74 61 3b 20 62 6f 75 6e 64 61 72 79 3d 2d 2d 2d 2d 57 65 62 4b 69 74 46 6f 72 6d 42 6f 75 6e 64 61 72 79 67 57 6f 4a 73 42 56 79 41 4c 57 71 51 6b 73 69 0a 31 34 30 39 37 37 37 32 39 33 0a 2f 64 69 2d 6b 79 72 73 74 65 6e 2d 64 65 61 6c 73 2f 76 4e 79 4b 4e 55 4c 37 51 68 4f 30 45 4b 38 52 58 44 70 32 59 77 25 32 46 63 35 37 65 64 37 62 39 2d 64 63 61 62 2d 34 63 30 62 2d 62 36 63 30 2d 36 31 66 30 36 62 32 30 37 34 66 31 2d 74 65 73 74 2e 74 78 74</StringToSignBytes> <RequestId>ED7C581570F547DB</RequestId><HostId>ZT6LsFYCbo1L0gYNcUwtdCWF6SNnyuUyKiL60ntJEZugx3cnDN/yH5KBjgEiBv5c</HostId><SignatureProvided>N2d7oNMVHvI6yxAXujNy8O5cF24=</SignatureProvided> <StringToSign>PUT multipart/form-data; boundary=----WebKitFormBoundarygWoJsBVyALWqQksi 1409777293 /test-bucket/vNyKNUL7QhO0EK8RXDp2Yw%2Fc57ed7b9-dcab-4c0b-b6c0-61f06b2074f1-test.txt</StringToSign><AWSAccessKeyId>FAKEACCESSKEY</AWSAccessKeyId></Error> 

I know that the assigned url works because I can upload the file correctly via CURL:

 curl -v --upload-file {filename} {presigned url} 

Answer 1

We ourselves found the problem. Here is the code we used to generate the pre-signed URL:

 val dt: DateTime = new DateTime() val expiration = DateTime.now.plusMillis(timeout.toInt) val presignedUrlRequest: GeneratePresignedUrlRequest = new GeneratePresignedUrlRequest(awsBucket, key, HttpMethod.PUT) presignedUrlRequest.setExpiration(expiration.toDate()) // WE ADDED THIS LINE presignedUrlRequest.setContentType("multipart/form-data") s3client.generatePresignedUrl(presignedUrlRequest).toString() 

We needed to set the content type to presignedUrlRequest, and also add headers: {'Content-Type': 'multipart/form-data'} to our ajax call.

The url generation method first worked with CURL since we did not set the content type to presignedUrlRequest and curl did not set the content type.