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Helper utility to write gocd plugins

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/*
 * Copyright 2019 Thoughtworks, Inc.
 *
 * 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 cd.go.plugin.base.validation;

import cd.go.plugin.base.metadata.MetadataExtractor;
import cd.go.plugin.base.metadata.MetadataHolder;

import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import static java.lang.String.format;

public class DefaultValidator implements Validator {
    private final Class secretConfigClazz;

    public DefaultValidator(Class secretConfigClazz) {
        this.secretConfigClazz = secretConfigClazz;
    }

    @Override
    public ValidationResult validate(Map requestBody) {
        final List metadataHolders = new MetadataExtractor().forClass(this.secretConfigClazz);

        final ValidationResult validationResult = new ValidationResult();
        Set knownFields = new HashSet<>();
        metadataHolders.forEach(metadataHolder -> {
            knownFields.add(metadataHolder.getKey());
            final String value = requestBody.get(metadataHolder.getKey());
            if (metadataHolder.getMetadata().isRequired() && (value == null || value.isBlank())) {
                validationResult.add(metadataHolder.getKey(), format("%s must not be blank.", metadataHolder.getKey()));
            }
        });

        final Set unknownFields = new HashSet<>(requestBody.keySet());
        unknownFields.removeAll(knownFields);
        unknownFields.forEach(field -> validationResult.add(field, "Is an unknown property"));

        return validationResult;
    }
}