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Kafka Compatible Schema Registry

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/**
 * Copyright (c) 2019 - 2024 StreamNative, Inc.. All Rights Reserved.
 */
/**
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.streamnative.pulsar.handlers.kop.schemaregistry.utils;

import io.streamnative.pulsar.handlers.kop.schemaregistry.exceptions.RestInvalidSubjectException;

public class SubjectUtils {

    private static final String persistentDomain = "persistent://";

    /**
     * Expand the subject name to full subject name.
     * For example:
     * 1. "persistent://public/default/test" -> "public/default/test"
     * 2. "test" -> "public/default/test"
     * 3. "public/default/test" -> "public/default/test"
     * 4. "public/default" -> throw RestInvalidSubjectException
     *
     * @param subject subject name
     * @param namespace default namespace
     * @return full subject name
     * @throws RestInvalidSubjectException if the subject is invalid
     */
    public static String normalize(String subject, String namespace) {
        if (subject == null) {
            throw new RestInvalidSubjectException("null");
        }
        if (subject.startsWith(persistentDomain)) {
            String substring = subject.substring(persistentDomain.length());
            if (substring.split("/").length != 3) {
                throw new RestInvalidSubjectException(subject);
            }
            return substring;
        }

        String[] parts = subject.split("/");
        if (parts.length == 3) {
            return subject;
        } else if (parts.length == 1 && namespace != null) {
            return namespace + "/" + subject;
        } else {
            throw new RestInvalidSubjectException(subject);
        }
    }
}