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CHAPTER 6 THE CONTROLLER MENAGERIE
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expected = new PhoneNumber(); expected.setAreaCode("222"); expected.setPrefix("333"); expected.setSuffix("4444"); } public void testBind() { PhoneNumberEditor editor = new PhoneNumberEditor(); binder.registerCustomEditor(PhoneNumber.class, editor); request.addParameter("phoneNumber", "(222) 333-4444"); binder.bind(request); assertEquals(expected.getAreaCode(), bean.getPhoneNumber().getAreaCode()); assertEquals(expected.getPrefix(), bean.getPhoneNumber().getPrefix()); assertEquals(expected.getSuffix(), bean.getPhoneNumber().getSuffix()); } This all works because the property on the command bean is of type PhoneNumber, so the PhoneNumberPropertyEditor can easily be called upon to do the String to PhoneNumber conversion. There is no limit to the number of PropertyEditors you can declare and register to a DataBinder. You can also replace a registered PropertyEditor in the DataBinder if you wish to redefine which editor is called upon for each class. As mentioned, you may also choose to map each property of the PhoneNumber class to a HTML text field. In this case, you will not need a custom PropertyEditor. However, if you find that you need to use a single text field to contain the entire value of a bean, even if that bean has multiple properties, then a custom PropertyEditor will allow you to handle this scenario. In other words, when you need to convert a single String value into a single complex object (potentially with many properties of its own), use a custom PropertyEditor.
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Controlling Which Fields Are Bound
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By default, the DataBinder will bind to any property on a bean that it can. That is, if the HTTP request contains a parameter name that matches a property of the bean, the bean s setter for that property will be called. Depending on the situation, this may or may not be what you will want. It is possible to control when fields can become bound, in order to provide an extra layer of protection from outside manipulation. For instance, in Spring MVC, it s very common to bind request parameters directly to domain object models. Although this streamlines development and reduces the amount of classes in the system, it does present a potential security risk for the system. The binding process exposes the domain object directly to outside information. An attacker can, if enough knowledge of the system is gained, manipulate the domain object by sending an unintended request property and value with the form submit. This action would potentially bypass validation, and otherwise incur a risky situation. To provide extra security for handling incoming data, the DataBinder can be configured to allow only accepted and approved properties. Properties not in the approved list will be dropped, and binding will continue.
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CHAPTER 6 THE CONTROLLER MENAGERIE
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To allow certain properties, simply call the setAllowedFields() method with a full list of all properties to be considered for binding. You will need to set this list before binding will take place. The example in Listing 6-36 illustrates how to secure the binding process to only bind allowed fields. We re using the simple Name class (Listing 6-5) for this example, and we prohibit the lastName from being bound. Listing 6-36. Allowed Fields Test public void setUp() { name = new Name(); binder = new ServletRequestDataBinder(name, "name"); request = new MockHttpServletRequest(); } public void testAllowedFields() { // only allow firstName field, ignore all others binder.setAllowedFields(new String[]{"firstName"}); request.addParameter("firstName", "First"); request.addParameter("lastName", "Last"); binder.bind(request); // only print log message on non-allowed fields // allow binding to continue
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assertEquals("First", name.getFirstName()); assertNull(name.getLastName()); } By specifying which fields should be allowed for a particular binding, you can ensure that only intended fields from the HTML form will eventually make their way into the domain objects. Otherwise, there is no protection from misconfigured or malicious request parameters.
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Rudimentary Validation
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While Spring MVC support s Spring s flexible validation framework (covered in great detail in 9), the DataBinder provides a sort of first line of defense through its basic validation support. The DataBinder can be configured to check for required fields, or type mismatches, and any errors from these rules flow right into the main Validation system. Although we will dedicate an entire chapter to Spring MVC s validation framework, to fully understand the DataBinder s basic validation support we will very briefly cover some of the fundamental constructs here. For every instance of data binding, there is a corresponding instance of a org.springframework.validation.BindException. This object is created automatically when binding begins, and encapsulates all the errors either general object errors or field level errors resulting from the binding and validation process.
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