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Introduce a username validator

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This commit is contained in:
Jon Chambers
2021-11-15 11:25:31 -05:00
committed by Jon Chambers
parent 17c9b4c5d3
commit efb410444b
4 changed files with 113 additions and 12 deletions
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27
service/src/main/java/org/whispersystems/textsecuregcm/util/Username.java Normal file
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/*
* Copyright 2013-2021 Signal Messenger, LLC
* SPDX-License-Identifier: AGPL-3.0-only
*/
package org.whispersystems.textsecuregcm.util;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import javax.validation.Constraint;
import javax.validation.Payload;
@Target({ FIELD, PARAMETER })
@Retention(RUNTIME)
@Constraint(validatedBy = UsernameValidator.class)
public @interface Username {
String message() default "{org.whispersystems.textsecuregcm.util.Username.message}";
Class<?>[] groups() default { };
Class<? extends Payload>[] payload() default { };
}

26
service/src/main/java/org/whispersystems/textsecuregcm/util/UsernameValidator.java Normal file
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/*
* Copyright 2013-2021 Signal Messenger, LLC
* SPDX-License-Identifier: AGPL-3.0-only
*/
package org.whispersystems.textsecuregcm.util;
import org.apache.commons.lang3.StringUtils;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.util.regex.Pattern;
public class UsernameValidator implements ConstraintValidator<Username, String> {
private static final Pattern USERNAME_PATTERN =
Pattern.compile("^[a-z_][a-z0-9_]{3,25}$", Pattern.CASE_INSENSITIVE);
@Override
public boolean isValid(final String username, final ConstraintValidatorContext context) {
return StringUtils.isNotBlank(username) && USERNAME_PATTERN.matcher(getCanonicalUsername(username)).matches();
}
public static String getCanonicalUsername(final String username) {
return username != null ? username.toLowerCase() : null;
}
}