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Przepraszam
VIP Member

Posts: 14507
Location: Poland. New York.

Posted: Tue, 29th Apr 2014 01:15 Post subject: Username Validation?

Hello. I'm trying to implement username validation so that it only allows letters, numbers and _. Well only, check whether username has any other illegal characters

Here is my ValidUsername.java

Code:

package com.blabla.web.validator;
import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.CONSTRUCTOR;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import javax.validation.Constraint;
import javax.validation.Payload;

@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
@Retention(RUNTIME)
@Constraint(validatedBy = ValidUsernameValidator.class)
@Documented
public @interface ValidUsername {

   String message() default "{com.blabla.constraints.username.invalid.special.characters}";

   Class<?>[] groups() default {};

   Class<? extends Payload>[] payload() default {};

}

Here is my ValidUsernameValidator.java

Code:

package com.blabla.web.validator;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

public class ValidUsernameValidator implements ConstraintValidator<ValidUsername, String> {
private Pattern pattern;
private Matcher matcher;

private static final String USERNAME_PATTERN = "^[A-Za-z0-9_]$";

@Override
public void initialize(ValidUsername username) {
   pattern = Pattern.compile(USERNAME_PATTERN);
}

@Override
public boolean isValid(String pUsername, ConstraintValidatorContext context) {
   boolean isValidUsername = false;
   System.out.println("isvalid function");
      CharSequence usernamestr = pUsername;
      matcher = pattern.matcher(usernamestr);
      System.out.println(pUsername);
      System.out.println(pattern);
      System.out.println(matcher.matches());
      if(matcher.matches()){
         isValidUsername = true;
         }
         return isValidUsername;
      }
}

And my SignUpForm.java

Code:

@ValidUsername
private String mUsername;

public String getUsername() {
return mUsername;
}
public void setUsername(String pUsername) {
mUsername = pUsername;
}

And like, it still allows all the characters. I did some logs and it looks like it always returns a false value for some reason so it looks like it's not checking against it.

Any tips? ;\

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Przepraszam
VIP Member

Posts: 14507
Location: Poland. New York.

Posted: Tue, 29th Apr 2014 17:10 Post subject:	Quick Quote Quote

Duh. I am so retarded. The code actually works fine.

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