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Place the file on Amazon S3 using multi-page download

I am trying to upload a file using the Amazon Java SDK via multi-page download. The idea is to pass the upload-id identifier to the applet, which places parts of the files in readonly-bucket. By doing so, I avoid storing AWS credentials in the applet.

In my tests, I generate upload id with boto (python) and save the file in a bucket. It works well.

My Applet gets the “403 Access denied” from S3, and I have no idea why.

Here is my code (which is partially taken from http://docs.amazonwebservices.com/AmazonS3/latest/dev/llJavaUploadFile.html ):

AmazonS3 s3Client = new AmazonS3Client();
List<PartETag> partETags = new ArrayList<PartETag>();

long contentLength = file.length();
long partSize = Config.getInstance().getInt("part_size");
String bucketName = Config.getInstance().getString("bucket");
String keyName = "mykey";
String uploadId = getParameter("upload_id");

try {
    long filePosition = 0;
    for (int i = 1; filePosition < contentLength; i++) {

        partSize = Math.min(partSize, (contentLength - filePosition));

        // Create request to upload a part.
        UploadPartRequest uploadRequest = new UploadPartRequest()
            .withBucketName(bucket).withKey(keyName)
            .withUploadId(uploadId).withPartNumber(i)
            .withFileOffset(filePosition)
            .withFile(file)
            .withPartSize(partSize);

        // Upload part and add response to our list.
        partETags.add(s3Client.uploadPart(uploadRequest).getPartETag());

        filePosition += partSize;
    }

    System.out.println("Completing upload");
    CompleteMultipartUploadRequest compRequest = new 
                CompleteMultipartUploadRequest(bucket, 
                                            keyName, 
                                            uploadId, 
                                            partETags);

    s3Client.completeMultipartUpload(compRequest);
} catch (Exception e) {
    s3Client.abortMultipartUpload(new AbortMultipartUploadRequest(
            bucketName, keyName, uploadId));
}

In the applet's debug log I find this, and then:

INFO: Sending Request: PUT https://mybucket.s3.amazonaws.com /mykey Parameters: (uploadId: V4hwobOLQ1rYof54zRW0pfk2EfhN7B0fpMJTOpHOcmaUl8k_ejSo_znPI540.lpO.ZO.bGjh.3cx8a12ZMODfA--, partNumber: 1, ) Headers: (Content-Length: 4288546, Content-Type: application/x-www-form-urlencoded; charset=utf-8, ) 
24.01.2012 16:48:42 com.amazonaws.http.AmazonHttpClient handleErrorResponse
INFO: Received error response: Status Code: 403, AWS Service: null, AWS Request ID: DECF32CCFEE9EBF0, AWS Error Code: AccessDenied, AWS Error Message: Access Denied, S3 Extended Request ID: xtL1ixsGM2/vsxJ+cZRHpkPZ23SMfP8hZZjQCQnp8oWGwdS2/aGfYgomihyqaDCQ

Do you find any obvious errors in the code?

Thanks Stefan

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