Support @ValidPrintable on String values

Author: aabashkin

src/main/java/org/owasp/esapi/reference/validation/annotations/ValidPrintable.java

@@ -18,7 +18,7 @@
 
 @Target({METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE})
 @Retention(RUNTIME)
-@Constraint(validatedBy = ValidPrintableValidator.class)
+@Constraint(validatedBy = {ValidPrintableValidator.class, ValidPrintableStringValidator.class})
 @Documented
 public @interface ValidPrintable {
 

src/main/java/org/owasp/esapi/reference/validation/annotations/ValidPrintableStringValidator.java

@@ -0,0 +1,37 @@
+package org.owasp.esapi.reference.validation.annotations;
+
+import javax.validation.ConstraintValidator;
+import javax.validation.ConstraintValidatorContext;
+
+import org.owasp.esapi.ESAPI;
+import org.owasp.esapi.ValidationErrorList;
+
+
+public class ValidPrintableStringValidator implements ConstraintValidator<ValidPrintable, String>{
+     
+    private String context;
+    private int maxLength;
+    private boolean allowNull;
+
+    @Override
+    public void initialize(ValidPrintable validPrintable) {
+        context = validPrintable.context();
+        maxLength = validPrintable.maxLength();
+        allowNull = validPrintable.allowNull();
+    }
+ 
+    @Override
+    public boolean isValid(String input, ConstraintValidatorContext constraintValidatorContext) {
+        if (input == null) {
+            return true;
+        }
+        ValidationErrorList errorList = new ValidationErrorList();
+        boolean valid = ESAPI.validator().isValidPrintable(context, input, maxLength, allowNull, errorList);
+        
+        if(!valid){
+            ValidationUtil.addViolatons(errorList, constraintValidatorContext);
+        }
+        
+        return valid;
+    }
+}