text: /*
   * Copyright 2002-2019 the original author or authors.
   *
   * 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
   *
   *      https://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 org.springframework.web.servlet.resource;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  import javax.servlet.http.HttpServletRequest;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import org.springframework.core.io.ClassPathResource;
  import org.springframework.core.io.Resource;
  import org.springframework.web.testfixture.servlet.MockHttpServletRequest;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  /**
   * Unit tests for {@code ResourceTransformerSupport}.
   *
   * @author Brian Clozel
   * @author Rossen Stoyanchev
   */
  public class ResourceTransformerSupportTests {
  
  	private ResourceTransformerChain transformerChain;
  
  	private TestResourceTransformerSupport transformer;
  
  	private final MockHttpServletRequest request = new MockHttpServletRequest("GET", "/");
  
  
  	@BeforeEach
  	public void setUp() {
  		VersionResourceResolver versionResolver = new VersionResourceResolver();
  		versionResolver.setStrategyMap(Collections.singletonMap("/**", new ContentVersionStrategy()));
  		PathResourceResolver pathResolver = new PathResourceResolver();
  		pathResolver.setAllowedLocations(new ClassPathResource("test/", getClass()));
  		List<ResourceResolver> resolvers = new ArrayList<>();
  		resolvers.add(versionResolver);
  		resolvers.add(pathResolver);
  		this.transformerChain = new DefaultResourceTransformerChain(new DefaultResourceResolverChain(resolvers), null);
  
  		this.transformer = new TestResourceTransformerSupport();
  		this.transformer.setResourceUrlProvider(createUrlProvider(resolvers));
  	}
  
  	private ResourceUrlProvider createUrlProvider(List<ResourceResolver> resolvers) {
  		ResourceHttpRequestHandler handler = new ResourceHttpRequestHandler();
  		handler.setLocations(Collections.singletonList(new ClassPathResource("test/", getClass())));
  		handler.setResourceResolvers(resolvers);
  
  		ResourceUrlProvider urlProvider = new ResourceUrlProvider();
  		urlProvider.setHandlerMap(Collections.singletonMap("/resources/**", handler));
  		return urlProvider;
  	}
  
  
  	@Test
  	public void resolveUrlPath() {
  		this.request.setRequestURI("/context/servlet/resources/main.css");
  		this.request.setContextPath("/context");
  		this.request.setServletPath("/servlet");
  		String resourcePath = "/context/servlet/resources/bar.css";
  		Resource resource = getResource("main.css");
  		String actual = this.transformer.resolveUrlPath(resourcePath, this.request, resource, this.transformerChain);
  
  		assertThat(actual).isEqualTo("/context/servlet/resources/bar-11e16cf79faee7ac698c805cf28248d2.css");
  	}
  
  	@Test
  	public void resolveUrlPathWithRelativePath() {
  		Resource resource = getResource("main.css");
  		String actual = this.transformer.resolveUrlPath("bar.css", this.request, resource, this.transformerChain);
  
  		assertThat(actual).isEqualTo("bar-11e16cf79faee7ac698c805cf28248d2.css");
  	}
  
  	@Test
  	public void resolveUrlPathWithRelativePathInParentDirectory() {
  		Resource resource = getResource("images/image.png");
  		String actual = this.transformer.resolveUrlPath("../bar.css", this.request, resource, this.transformerChain);
  
  		assertThat(actual).isEqualTo("../bar-11e16cf79faee7ac698c805cf28248d2.css");
  	}
  
  	@Test
  	public void toAbsolutePath() {
  		String absolute = this.transformer.toAbsolutePath("img/image.png",
  				new MockHttpServletRequest("GET", "/resources/style.css"));
  		assertThat(absolute).isEqualTo("/resources/img/image.png");
  
  		absolute = this.transformer.toAbsolutePath("/img/image.png",
  				new MockHttpServletRequest("GET", "/resources/style.css"));
  		assertThat(absolute).isEqualTo("/img/image.png");
  	}
  
  	private Resource getResource(String filePath) {
  		return new ClassPathResource("test/" + filePath, getClass());
  	}
  
  
  	private static class TestResourceTransformerSupport extends ResourceTransformerSupport {
  
  		@Override
  		public Resource transform(HttpServletRequest request, Resource resource, ResourceTransformerChain chain) {
  			throw new IllegalStateException("Should never be called");
  		}
  	}
  
  }
  