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POAmazon Product Advertising API signed request with Java
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  1. POAmazon Product Advertising API signed request with Java
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    copied!<p>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.</p> <p>So far I managed to generate a client from the provided WSDL file. I used a tutorial by Amazon for this. You can find it here:</p> <p><a href="http://docs.amazonwebservices.com/AWSECommerceService/latest/GSG/index.html?YourDevelopmentEnvironment.html" rel="nofollow noreferrer">Tutorial for generating the web service client</a></p> <p>So far no problems. To test the client I wrote a small piece of code. The code is intended to simply get some information about a product. The product is specified by its ASIN.</p> <p>The code:</p> <pre><code>package client; import com.ECS.client.jax.AWSECommerceService; import com.ECS.client.jax.AWSECommerceServicePortType; import com.ECS.client.jax.ItemLookup; import com.ECS.client.jax.ItemLookupResponse; import com.ECS.client.jax.ItemLookupRequest; public class Client { public static void main(String[] args) { System.out.println("API Test startet"); AWSECommerceService service = new AWSECommerceService(); AWSECommerceServicePortType port = service.getAWSECommerceServicePort(); ItemLookupRequest itemLookup = new ItemLookupRequest(); itemLookup.setIdType("ASIN"); itemLookup.getItemId().add("B000RE216U"); ItemLookup lookup = new ItemLookup(); lookup.setAWSAccessKeyId("&lt;mykeyishere&gt;"); lookup.getRequest().add(itemLookup); ItemLookupResponse response = port.itemLookup(lookup); String r = response.toString(); System.out.println("response: " + r); System.out.println("API Test stopped"); } } </code></pre> <p>As you can see there is no part where I sign the request. I have worked my way through a lot of the classes used and found no methods for signing the request.</p> <p>So, how to sign a request?</p> <p>I actually found something in the documentation: <a href="http://docs.amazonwebservices.com/AWSECommerceService/2009-11-01/DG/" rel="nofollow noreferrer">request authentication</a></p> <p>But they don't use their own API. The proposed solutions are more or less for manual use only. So I looked in the client classes to sort out if I could get the request URL and put all the parts needed for request signing in myself. But there are no such methods.</p> <p>I hope someone can point out what I am doing wrong.</p> <hr> <p>This is what I did to solve the problem. All the credit goes to <a href="https://stackoverflow.com/users/84539/jon">Jon</a> and the guys of the Amazon forums.</p> <p>Before I outline what I did, here is a link to the post which helped me to solve the problem: <a href="http://developer.amazonwebservices.com/connect/message.jspa?messageID=143124" rel="nofollow noreferrer">Forum Post on Amazon forums</a>.</p> <p>I downloaded the awshandlerresolver.java which is linked in the post. Than I modified my own code so it looks like this:</p> <pre><code>package client; import com.ECS.client.jax.AWSECommerceService; import com.ECS.client.jax.AWSECommerceServicePortType; import com.ECS.client.jax.ItemLookup; import com.ECS.client.jax.ItemLookupResponse; import com.ECS.client.jax.ItemLookupRequest; public class Client { public static void main(String[] args) { System.out.println("API Test startet"); AWSECommerceService service = new AWSECommerceService(); service.setHandlerResolver(new AwsHandlerResolver("&lt;Secret Key&gt;")); // important AWSECommerceServicePortType port = service.getAWSECommerceServicePort(); ItemLookupRequest itemLookup = new ItemLookupRequest(); itemLookup.setIdType("ASIN"); itemLookup.getItemId().add("B000RE216U"); ItemLookup lookup = new ItemLookup(); lookup.setAWSAccessKeyId("&lt;Access Key&gt;"); // important lookup.getRequest().add(itemLookup); ItemLookupResponse response = port.itemLookup(lookup); String r = response.toString(); System.out.println("response: " + r); System.out.println("API Test stopped"); } } </code></pre> <p>The println on the end are more or less useless. But it works. I also used the WSDL Jon linked to generate a new webservice client. I just changed the URLs in the tutorial I posted in my question.</p>
 

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