Amazon Product Advertising API signed request with Java

Question

after many hours of tinkering and reading the whole internet several times I just can\'t figure out how to sign requests for use with the Product Advertising API.

So

Answer 1

This discussion and the related Amazon post helped me get the client working. That being said, I felt that the solution could be improved with regards to the following:

1. Setting WebService handlers in code is discouraged. A XML configuration file and a corresponding @HandlerChain annotation are recommended.
2. A SOAPHandler is not required in this case, LogicalHandler would do just fine. A SOAPHandler has more reach than a LogicalHandler and when it comes to code, more access is not always good.
3. Stuffing the signature generation, addition of a Node and printing the request in one handler seems like a little too much. These could be separated out for separation of responsibility and ease of testing. One approach would be to add the Node using a XSLT transformation so that the handler could remain oblivious of the transformation logic. Another handler could then be chained which just prints the request. Example