Re: [Resteasy-users] validation of method parameters
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.comRon 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 (IteratorString it = params.stringList.iterator(); it.hasNext(); )
{
String s = it.next();
System.out.println(s);
}
}
}
public static class TestClassValidator implements ConstraintValidatorTestClassConstraint, MyParams
{
int eachLength;
public void initialize(TestClassConstraint constraintAnnotation)
{
eachLength = constraintAnnotation.value();
}
@Override
public boolean isValid(MyParams value, ConstraintValidatorContext context)
{
for (IteratorString 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 ArrayListString stringList = new ArrayListString();
}
@Before
public void before() throws Exception
{
HashtableString,String initParams = new HashtableString,String();
HashtableString,String contextParams = new HashtableString,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, );
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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Re: [Resteasy-users] validation of method parameters
Hi Savvas,
Thank you for your response; I did try it the way you suggested, and you
are right: the params are bound to the ArrayList.
What I found was that application of the @Size annotation as below, imposes
the constraint that the length of the list be no greater than the specified
max.
@Size(max=1000)
@FormParam(a)
private ArrayListString stringList = new ArrayListString();
While that constraint is useful to me, I also wanted to impose a constraint
that each individual inbound string be checked that its length falls within
a specified range - in my prior example, between 8 and 10 characters.
Research has led me to believe that this is nontrivial, though I did see
someone had developed and shared a library containing @Each annotations ...
and that there (possibly) may be improvements along these lines that would
only work with Java 8.
I was curious why the method-based solution didn't work (my addString
method) because that actually would do the validation I had in mind. That
said, appreciate the time you took to respond.
Best,
Dave
On Sat, Feb 21, 2015 at 2:57 PM, Savvas Andreas Moysidis
savvas.andreas.moysi...@gmail.com wrote:
Hi Dave,
Not really sure why the bean validation stuff doesn't work but in order to
bind form params you probably need to configure your resource method and
binding class in a different way. Try the following:
@GET
public my object class, not important
resourceMethod(@Valid @*BeanParam* MyParams params)
{
...
}
public class MyParams {
@FormParam(a)
private ArrayListString stringList = new ArrayList();
...
}
This should bind your form params into your MyParams class.
A minor side note: The convention many frameworks use when binding http
params at method level is the POJO one (i.e. *set*This()/*get*This()
rather than addThis() etc)
HTF,
Savvas
On 19 February 2015 at 19:48, Dave J devdevdata...@gmail.com wrote:
Hello,
After some nontrivial research I thought I would try this list in the
hopes more expert users could help me figure out where I am going wrong.
I am using RESTeasy 3.0.9. I am trying to affect validation of a
parameter coming in on the URL for a GET request.
I use a class to aggregate validation storage of the set of parameters
coming in on the URL.
I start with this:
@GET
public my object class, not important
resourceMethod(@Valid @Form MyParams params)
{
...
}
The parameter of interest is a String, and can occur more than once.
Let's name it a.
I would like to validate each occurrence (I want to check that its length
is within a certain range), and if valid, I would like to add the String to
a list. Otherwise, stop and report the error.
So within the MyParams class
public class MyParams {
private ArrayListString stringList = new ArrayListString();
...
// Would rather this return void, but validation doesn't like
constraints on void methods
@QueryParam('a)
public String addString(@Size(min=8,max=10) String str) {
stringList.add(str);
return null;
}
}
However in this scenario, the incoming string is neither validated nor
added to the list.
Is it possible to do this within RESTeasy? I'm happy to provide more info
if needed.
Thanks.
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Re: [Resteasy-users] validation of method parameters
Hi Dave,
Not really sure why the bean validation stuff doesn't work but in order to
bind form params you probably need to configure your resource method and
binding class in a different way. Try the following:
@GET
public my object class, not important
resourceMethod(@Valid @*BeanParam* MyParams params)
{
...
}
public class MyParams {
@FormParam(a)
private ArrayListString stringList = new ArrayList();
...
}
This should bind your form params into your MyParams class.
A minor side note: The convention many frameworks use when binding http
params at method level is the POJO one (i.e. *set*This()/*get*This() rather
than addThis() etc)
HTF,
Savvas
On 19 February 2015 at 19:48, Dave J devdevdata...@gmail.com wrote:
Hello,
After some nontrivial research I thought I would try this list in the
hopes more expert users could help me figure out where I am going wrong.
I am using RESTeasy 3.0.9. I am trying to affect validation of a parameter
coming in on the URL for a GET request.
I use a class to aggregate validation storage of the set of parameters
coming in on the URL.
I start with this:
@GET
public my object class, not important
resourceMethod(@Valid @Form MyParams params)
{
...
}
The parameter of interest is a String, and can occur more than once. Let's
name it a.
I would like to validate each occurrence (I want to check that its length
is within a certain range), and if valid, I would like to add the String to
a list. Otherwise, stop and report the error.
So within the MyParams class
public class MyParams {
private ArrayListString stringList = new ArrayListString();
...
// Would rather this return void, but validation doesn't like
constraints on void methods
@QueryParam('a)
public String addString(@Size(min=8,max=10) String str) {
stringList.add(str);
return null;
}
}
However in this scenario, the incoming string is neither validated nor
added to the list.
Is it possible to do this within RESTeasy? I'm happy to provide more info
if needed.
Thanks.
--
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