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PathResourceLookupFunction.java
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PathResourceLookupFunction.java
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/*
* Copyright 2002-2021 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.reactive.function.server;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.charset.StandardCharsets;
import java.util.function.Function;
import reactor.core.publisher.Mono;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.UrlResource;
import org.springframework.http.server.PathContainer;
import org.springframework.util.Assert;
import org.springframework.util.ResourceUtils;
import org.springframework.util.StringUtils;
import org.springframework.web.util.pattern.PathPattern;
import org.springframework.web.util.pattern.PathPatternParser;
/**
* Lookup function used by {@link RouterFunctions#resources(String, Resource)}.
*
* @author Arjen Poutsma
* @since 5.0
*/
class PathResourceLookupFunction implements Function<ServerRequest, Mono<Resource>> {
private final PathPattern pattern;
private final Resource location;
public PathResourceLookupFunction(String pattern, Resource location) {
Assert.hasLength(pattern, "'pattern' must not be empty");
Assert.notNull(location, "'location' must not be null");
this.pattern = PathPatternParser.defaultInstance.parse(pattern);
this.location = location;
}
@Override
public Mono<Resource> apply(ServerRequest request) {
PathContainer pathContainer = request.pathContainer();
if (!this.pattern.matches(pathContainer)) {
return Mono.empty();
}
pathContainer = this.pattern.extractPathWithinPattern(pathContainer);
String path = processPath(pathContainer.value());
if (path.contains("%")) {
path = StringUtils.uriDecode(path, StandardCharsets.UTF_8);
}
if (!StringUtils.hasLength(path) || isInvalidPath(path)) {
return Mono.empty();
}
try {
Resource resource = this.location.createRelative(path);
if (resource.isReadable() && isResourceUnderLocation(resource)) {
return Mono.just(resource);
}
else {
return Mono.empty();
}
}
catch (IOException ex) {
throw new UncheckedIOException(ex);
}
}
private String processPath(String path) {
boolean slash = false;
for (int i = 0; i < path.length(); i++) {
if (path.charAt(i) == '/') {
slash = true;
}
else if (path.charAt(i) > ' ' && path.charAt(i) != 127) {
if (i == 0 || (i == 1 && slash)) {
return path;
}
path = slash ? "/" + path.substring(i) : path.substring(i);
return path;
}
}
return (slash ? "/" : "");
}
private boolean isInvalidPath(String path) {
if (path.contains("WEB-INF") || path.contains("META-INF")) {
return true;
}
if (path.contains(":/")) {
String relativePath = (path.charAt(0) == '/' ? path.substring(1) : path);
if (ResourceUtils.isUrl(relativePath) || relativePath.startsWith("url:")) {
return true;
}
}
if (path.contains("..") && StringUtils.cleanPath(path).contains("../")) {
return true;
}
return false;
}
private boolean isResourceUnderLocation(Resource resource) throws IOException {
if (resource.getClass() != this.location.getClass()) {
return false;
}
String resourcePath;
String locationPath;
if (resource instanceof UrlResource) {
resourcePath = resource.getURL().toExternalForm();
locationPath = StringUtils.cleanPath(this.location.getURL().toString());
}
else if (resource instanceof ClassPathResource) {
resourcePath = ((ClassPathResource) resource).getPath();
locationPath = StringUtils.cleanPath(((ClassPathResource) this.location).getPath());
}
else {
resourcePath = resource.getURL().getPath();
locationPath = StringUtils.cleanPath(this.location.getURL().getPath());
}
if (locationPath.equals(resourcePath)) {
return true;
}
locationPath = (locationPath.endsWith("/") || locationPath.isEmpty() ? locationPath : locationPath + "/");
if (!resourcePath.startsWith(locationPath)) {
return false;
}
if (resourcePath.contains("%") && StringUtils.uriDecode(resourcePath, StandardCharsets.UTF_8).contains("../")) {
return false;
}
return true;
}
@Override
public String toString() {
return this.pattern + " -> " + this.location;
}
}