Re: [Resteasy-users] validation of method parameters

[Ron Sigal]

Hi Dave J,

You can validate the size of each element of a List by writing your own 
validation constraint.  See the attached TestJunk program.

Note that either @Form or @BeanParam would work. @Form is specific to 
Resteasy.

-Ron
package org.jboss.resteasy.test.validation.junk;

import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static org.jboss.resteasy.test.TestPortProvider.generateURL;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.Iterator;

import javax.validation.Constraint;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.Payload;
import javax.validation.Valid;
import javax.ws.rs.FormParam;
import javax.ws.rs.POST;
import javax.ws.rs.Path;

import junit.framework.Assert;

import org.jboss.resteasy.annotations.Form;
import org.jboss.resteasy.api.validation.ViolationReport;
import org.jboss.resteasy.client.ClientRequest;
import org.jboss.resteasy.client.ClientResponse;
import org.jboss.resteasy.core.Dispatcher;
import org.jboss.resteasy.spi.ResteasyDeployment;
import org.jboss.resteasy.test.EmbeddedContainer;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

/**
 * @author <a href="mailto:ron.si...@jboss.com">Ron Sigal</a>
 * @date Jan 6, 2012
 */
public class TestJunk
{
   protected static ResteasyDeployment deployment;
   protected static Dispatcher dispatcher;

   @Path("/")
   public static class TestResource
   {
      @POST
      public void post(@Valid @Form MyParams params)
//      public void post(@Valid @BeanParam MyParams params)
      {
         System.out.println("length: " + params.stringList.size());
         for (Iterator<String> it = params.stringList.iterator(); it.hasNext(); )
         {
            String s = it.next();
            System.out.println(s);
         }
      }
   }
   
   public static class TestClassValidator implements ConstraintValidator<TestClassConstraint, MyParams>
   {
      int eachLength;

      public void initialize(TestClassConstraint constraintAnnotation)
      {
         eachLength = constraintAnnotation.value();
      }

      @Override
      public boolean isValid(MyParams value, ConstraintValidatorContext context)
      {
         for (Iterator<String> it = value.stringList.iterator(); it.hasNext(); )
         {
            if (it.next().length() > eachLength)
            {
               return false;
            }
         }
         return true;
      }
   }

   @Documented
   @Constraint(validatedBy = TestClassValidator.class)
   @Target({TYPE})
   @Retention(RUNTIME)
   public @interface TestClassConstraint {
      String message() default "Each element must have length < {value}";
      Class<?>[] groups() default {};
      Class<? extends Payload>[] payload() default {};
      int value();
   }
   
   @TestClassConstraint(3)
   public static class MyParams
   {
      @FormParam("a")
      public ArrayList<String> stringList = new ArrayList<String>();
   }

   @Before
   public void before() throws Exception
   {
      Hashtable<String,String> initParams = new Hashtable<String,String>();
      Hashtable<String,String> contextParams = new Hashtable<String,String>();
      deployment = EmbeddedContainer.start(initParams, contextParams);
      dispatcher = deployment.getDispatcher();
      deployment.getRegistry().addPerRequestResource(TestResource.class);
   }

   @After
   public void after() throws Exception
   {
      EmbeddedContainer.stop();
      dispatcher = null;
      deployment = null;
   }

   @Test
   public void testLengthPasses() throws Exception
   {
      ClientRequest request = new ClientRequest(generateURL("/"));
      request.formParameter("a", "x");
      request.formParameter("a", "y");
      ClientResponse<?> response = request.post();
      Assert.assertEquals(204, response.getStatus());
   }
   
   @Test
   public void testLengthFails() throws Exception
   {
      ClientRequest request = new ClientRequest(generateURL("/"));
      request.formParameter("a", "x");
      request.formParameter("a", "yyyy");
      ClientResponse<?> response = request.post();
      Assert.assertEquals(400, response.getStatus());
      ViolationReport report = response.getEntity(ViolationReport.class);
      System.out.println("violation: \r" + report.getParameterViolations().iterator().next());
   }
}
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