org.springframework.web.accept.ServletPathExtensionContentNegotiationStrategy Maven / Gradle / Ivy
/*
* Copyright 2002-2017 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.accept;
import java.util.Map;
import javax.servlet.ServletContext;
import org.springframework.core.io.Resource;
import org.springframework.http.MediaType;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import org.springframework.web.HttpMediaTypeNotAcceptableException;
import org.springframework.web.context.request.NativeWebRequest;
/**
* Extends {@code PathExtensionContentNegotiationStrategy} that also uses
* {@link ServletContext#getMimeType(String)} to resolve file extensions.
*
* @author Rossen Stoyanchev
* @since 3.2
*/
public class ServletPathExtensionContentNegotiationStrategy extends PathExtensionContentNegotiationStrategy {
private final ServletContext servletContext;
/**
* Create an instance without any mappings to start with. Mappings may be
* added later when extensions are resolved through
* {@link ServletContext#getMimeType(String)} or via
* {@link org.springframework.http.MediaTypeFactory}.
*/
public ServletPathExtensionContentNegotiationStrategy(ServletContext context) {
this(context, null);
}
/**
* Create an instance with the given extension-to-MediaType lookup.
*/
public ServletPathExtensionContentNegotiationStrategy(
ServletContext servletContext, @Nullable Map mediaTypes) {
super(mediaTypes);
Assert.notNull(servletContext, "ServletContext is required");
this.servletContext = servletContext;
}
/**
* Resolve file extension via {@link ServletContext#getMimeType(String)}
* and also delegate to base class for a potential
* {@link org.springframework.http.MediaTypeFactory} lookup.
*/
@Override
@Nullable
protected MediaType handleNoMatch(NativeWebRequest webRequest, String extension)
throws HttpMediaTypeNotAcceptableException {
MediaType mediaType = null;
String mimeType = this.servletContext.getMimeType("file." + extension);
if (StringUtils.hasText(mimeType)) {
mediaType = MediaType.parseMediaType(mimeType);
}
if (mediaType == null || MediaType.APPLICATION_OCTET_STREAM.equals(mediaType)) {
MediaType superMediaType = super.handleNoMatch(webRequest, extension);
if (superMediaType != null) {
mediaType = superMediaType;
}
}
return mediaType;
}
/**
* Extends the base class
* {@link PathExtensionContentNegotiationStrategy#getMediaTypeForResource}
* with the ability to also look up through the ServletContext.
* @param resource the resource to look up
* @return the MediaType for the extension, or {@code null} if none found
* @since 4.3
*/
@Override
public MediaType getMediaTypeForResource(Resource resource) {
MediaType mediaType = null;
String mimeType = this.servletContext.getMimeType(resource.getFilename());
if (StringUtils.hasText(mimeType)) {
mediaType = MediaType.parseMediaType(mimeType);
}
if (mediaType == null || MediaType.APPLICATION_OCTET_STREAM.equals(mediaType)) {
MediaType superMediaType = super.getMediaTypeForResource(resource);
if (superMediaType != null) {
mediaType = superMediaType;
}
}
return mediaType;
}
}