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package org.springdoc.webmvc.ui;

import java.io.IOException;
import java.nio.charset.StandardCharsets;

import jakarta.servlet.http.HttpServletRequest;
import org.springdoc.core.properties.SwaggerUiConfigParameters;
import org.springdoc.core.properties.SwaggerUiConfigProperties;
import org.springdoc.core.properties.SwaggerUiOAuthProperties;
import org.springdoc.core.providers.ObjectMapperProvider;
import org.springdoc.ui.AbstractSwaggerIndexTransformer;

import org.springframework.core.io.Resource;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.servlet.resource.ResourceTransformerChain;
import org.springframework.web.servlet.resource.TransformedResource;

import static org.springdoc.core.utils.Constants.SWAGGER_INITIALIZER_JS;

/**
 * The type Swagger index transformer.
 *
 * @author bnasslahsen
 */
public class SwaggerIndexPageTransformer extends AbstractSwaggerIndexTransformer implements SwaggerIndexTransformer {

	/**
	 * The Swagger welcome common.
	 */
	private final SwaggerWelcomeCommon swaggerWelcomeCommon;

	/**
	 * Instantiates a new Swagger index transformer.
	 *
	 * @param swaggerUiConfig          the swagger ui config
	 * @param swaggerUiOAuthProperties the swagger ui o auth properties
	 * @param swaggerWelcomeCommon     the swagger welcome common
	 * @param objectMapperProvider     the object mapper provider
	 */
	public SwaggerIndexPageTransformer(SwaggerUiConfigProperties swaggerUiConfig, SwaggerUiOAuthProperties swaggerUiOAuthProperties,
			SwaggerWelcomeCommon swaggerWelcomeCommon, ObjectMapperProvider objectMapperProvider) {
		super(swaggerUiConfig, swaggerUiOAuthProperties, objectMapperProvider);
		this.swaggerWelcomeCommon = swaggerWelcomeCommon;
	}

	@Override
	public Resource transform(HttpServletRequest request, Resource resource,
			ResourceTransformerChain transformerChain) throws IOException {
		SwaggerUiConfigParameters swaggerUiConfigParameters = new SwaggerUiConfigParameters(swaggerUiConfig);
		swaggerWelcomeCommon.buildFromCurrentContextPath(swaggerUiConfigParameters, request);
		
		final AntPathMatcher antPathMatcher = new AntPathMatcher();
		boolean isIndexFound = antPathMatcher.match("**/swagger-ui/**/" + SWAGGER_INITIALIZER_JS, resource.getURL().toString());

		if (isIndexFound) {
			String html = defaultTransformations(swaggerUiConfigParameters, resource.getInputStream());
			return new TransformedResource(resource, html.getBytes(StandardCharsets.UTF_8));
		}
		else
			return resource;
	}

}





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