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/*
 * Copyright (c) 2008-2025 The Aspectran Project
 *
 * 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 com.aspectran.thymeleaf.template;

import com.aspectran.utils.annotation.jsr305.NonNull;
import org.thymeleaf.IEngineConfiguration;
import org.thymeleaf.cache.ICacheEntryValidity;
import org.thymeleaf.cache.NonCacheableCacheEntryValidity;
import org.thymeleaf.templateresolver.AbstractConfigurableTemplateResolver;
import org.thymeleaf.templateresolver.ITemplateResolver;
import org.thymeleaf.templateresource.ITemplateResource;
import org.thymeleaf.templateresource.UrlTemplateResource;

import java.net.MalformedURLException;
import java.util.Map;
import java.util.regex.Pattern;

/**
 * Implementation of {@link ITemplateResolver} that extends {@link AbstractConfigurableTemplateResolver}
 * and creates {@link UrlTemplateResource} instances for template resources.
 * Note a class with this name existed since 1.0, but it was completely rewritten in Thymeleaf 3.0.
 */
public class UrlTemplateResolver extends AbstractConfigurableTemplateResolver {

    private static final Pattern JSESSIONID_PATTERN = Pattern.compile("(.*?);jsessionid(.*?)");

    public UrlTemplateResolver() {
        super();
    }

    @Override
    protected ITemplateResource computeTemplateResource(
            IEngineConfiguration configuration,
            String ownerTemplate,
            String template,
            String resourceName,
            String characterEncoding,
            Map templateResolutionAttributes) {
        try {
            return new UrlTemplateResource(resourceName, characterEncoding);
        } catch (MalformedURLException ignored) {
            return null;
        }
    }

    @Override
    protected ICacheEntryValidity computeValidity(
            IEngineConfiguration configuration,
            String ownerTemplate,
            @NonNull String template,
            Map templateResolutionAttributes) {
        /*
         * This check is made so that we don't fill the cache with entries for the same
         * template with different jsessionid values.
         */
        if (JSESSIONID_PATTERN.matcher(template.toLowerCase()).matches()) {
            return NonCacheableCacheEntryValidity.INSTANCE;
        } else {
            return computeValidity(configuration, ownerTemplate, template, templateResolutionAttributes);
        }
    }

}