Chapter 6. Transforming 3scale message content using policy extensions in Fuse

Procedure

1. Write an Apache Camel application in Java using the Camel netty4-http component to implement the HTTP proxy. You can then use any Camel component to transform the message.

   The following simple example performs an uppercase transformation of the request and the response from the service:

   import java.util.Locale;
   import org.apache.camel.Exchange;
   import org.apache.camel.Message;
   import org.apache.camel.builder.RouteBuilder;
   
   public class ProxyRoute extends RouteBuilder {
   
       @Override
       public void configure() throws Exception {
           from("netty4-http:proxy://0.0.0.0:8080")
               .process(ProxyRoute::uppercase)
               .toD("netty4-http:"
                   + "${headers." + Exchange.HTTP_SCHEME + "}://"
                   + "${headers." + Exchange.HTTP_HOST + "}:"
                   + "${headers." + Exchange.HTTP_PORT + "}"
                   + "${headers." + Exchange.HTTP_PATH + "}")
               .process(ProxyRoute::uppercase);
       }
   
       public static void uppercase(final Exchange exchange) {
           final Message message = exchange.getIn();
           final String body = message.getBody(String.class);
           message.setBody(body.toUpperCase(Locale.US));
       }
   }

2. Deploy your Camel application as described in Creating and Deploying Applications on Fuse on OpenShift.

Procedure

1. Select Integration > Configuration > edit APIcast configuration in the 3scale Admin Portal.
2. Select POLICIES > Add Policy > Proxy service.

3. Enter the route for the Camel proxy service in the appropriate field:

   • https_proxy: Connects to an HTTPS proxy service.
   • http_proxy: Connects to an HTTP proxy service.

   • all_proxy: Connects to services when the protocol is not specified.

     For example, the following shows the route for an HTTP proxy service:

     http://camel-proxy.my-3scale-management-project.svc

4. Click Update & test in staging environment to apply the new proxy policy.

5. Test the HTTP proxy using curl: For example:

   curl "https://testapi-3scale-apicast-staging.myuser.app.dev.3sca.net:443/?user_key=MY_USER_KEY" -k

6. Confirm that the message content has been transformed, which in this example means converted to uppercase.