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org.springframework.http.server.DefaultPathContainer Maven / Gradle / Ivy
/*
* Copyright 2002-2020 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.http.server;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.util.StringUtils;
/**
* Default implementation of {@link PathContainer}.
*
* @author Rossen Stoyanchev
* @since 5.0
*/
final class DefaultPathContainer implements PathContainer {
private static final MultiValueMap EMPTY_PARAMS = new LinkedMultiValueMap<>();
private static final PathContainer EMPTY_PATH = new DefaultPathContainer("", Collections.emptyList());
private static final Map SEPARATORS = new HashMap<>(2);
static {
SEPARATORS.put('/', new DefaultSeparator('/', "%2F"));
SEPARATORS.put('.', new DefaultSeparator('.', "%2E"));
}
private final String path;
private final List elements;
private DefaultPathContainer(String path, List elements) {
this.path = path;
this.elements = Collections.unmodifiableList(elements);
}
@Override
public String value() {
return this.path;
}
@Override
public List elements() {
return this.elements;
}
@Override
public boolean equals(@Nullable Object other) {
if (this == other) {
return true;
}
if (!(other instanceof PathContainer)) {
return false;
}
return value().equals(((PathContainer) other).value());
}
@Override
public int hashCode() {
return this.path.hashCode();
}
@Override
public String toString() {
return value();
}
static PathContainer createFromUrlPath(String path, Options options) {
if (path.isEmpty()) {
return EMPTY_PATH;
}
char separator = options.separator();
DefaultSeparator separatorElement = SEPARATORS.get(separator);
if (separatorElement == null) {
throw new IllegalArgumentException("Unexpected separator: '" + separator + "'");
}
List elements = new ArrayList<>();
int begin;
if (path.charAt(0) == separator) {
begin = 1;
elements.add(separatorElement);
}
else {
begin = 0;
}
while (begin < path.length()) {
int end = path.indexOf(separator, begin);
String segment = (end != -1 ? path.substring(begin, end) : path.substring(begin));
if (!segment.isEmpty()) {
elements.add(options.shouldDecodeAndParseSegments() ?
decodeAndParsePathSegment(segment) :
new DefaultPathSegment(segment, separatorElement));
}
if (end == -1) {
break;
}
elements.add(separatorElement);
begin = end + 1;
}
return new DefaultPathContainer(path, elements);
}
private static PathSegment decodeAndParsePathSegment(String segment) {
Charset charset = StandardCharsets.UTF_8;
int index = segment.indexOf(';');
if (index == -1) {
String valueToMatch = StringUtils.uriDecode(segment, charset);
return new DefaultPathSegment(segment, valueToMatch, EMPTY_PARAMS);
}
else {
String valueToMatch = StringUtils.uriDecode(segment.substring(0, index), charset);
String pathParameterContent = segment.substring(index);
MultiValueMap parameters = parsePathParams(pathParameterContent, charset);
return new DefaultPathSegment(segment, valueToMatch, parameters);
}
}
private static MultiValueMap parsePathParams(String input, Charset charset) {
MultiValueMap result = new LinkedMultiValueMap<>();
int begin = 1;
while (begin < input.length()) {
int end = input.indexOf(';', begin);
String param = (end != -1 ? input.substring(begin, end) : input.substring(begin));
parsePathParamValues(param, charset, result);
if (end == -1) {
break;
}
begin = end + 1;
}
return result;
}
private static void parsePathParamValues(String input, Charset charset, MultiValueMap output) {
if (StringUtils.hasText(input)) {
int index = input.indexOf('=');
if (index != -1) {
String name = input.substring(0, index);
String value = input.substring(index + 1);
for (String v : StringUtils.commaDelimitedListToStringArray(value)) {
name = StringUtils.uriDecode(name, charset);
if (StringUtils.hasText(name)) {
output.add(name, StringUtils.uriDecode(v, charset));
}
}
}
else {
String name = StringUtils.uriDecode(input, charset);
if (StringUtils.hasText(name)) {
output.add(input, "");
}
}
}
}
static PathContainer subPath(PathContainer container, int fromIndex, int toIndex) {
List elements = container.elements();
if (fromIndex == 0 && toIndex == elements.size()) {
return container;
}
if (fromIndex == toIndex) {
return EMPTY_PATH;
}
Assert.isTrue(fromIndex >= 0 && fromIndex < elements.size(), () -> "Invalid fromIndex: " + fromIndex);
Assert.isTrue(toIndex >= 0 && toIndex <= elements.size(), () -> "Invalid toIndex: " + toIndex);
Assert.isTrue(fromIndex < toIndex, () -> "fromIndex: " + fromIndex + " should be < toIndex " + toIndex);
List subList = elements.subList(fromIndex, toIndex);
String path = subList.stream().map(Element::value).collect(Collectors.joining(""));
return new DefaultPathContainer(path, subList);
}
private static class DefaultSeparator implements Separator {
private final String separator;
private final String encodedSequence;
DefaultSeparator(char separator, String encodedSequence) {
this.separator = String.valueOf(separator);
this.encodedSequence = encodedSequence;
}
@Override
public String value() {
return this.separator;
}
public String encodedSequence() {
return this.encodedSequence;
}
}
private static class DefaultPathSegment implements PathSegment {
private final String value;
private final String valueToMatch;
private final char[] valueToMatchAsChars;
private final MultiValueMap parameters;
/**
* Constructor for decoded and parsed segments.
*/
DefaultPathSegment(String value, String valueToMatch, MultiValueMap params) {
this.value = value;
this.valueToMatch = valueToMatch;
this.valueToMatchAsChars = valueToMatch.toCharArray();
this.parameters = CollectionUtils.unmodifiableMultiValueMap(params);
}
/**
* Constructor for segments without decoding and parsing.
*/
DefaultPathSegment(String value, DefaultSeparator separator) {
this.value = value;
this.valueToMatch = value.contains(separator.encodedSequence()) ?
value.replaceAll(separator.encodedSequence(), separator.value()) : value;
this.valueToMatchAsChars = this.valueToMatch.toCharArray();
this.parameters = EMPTY_PARAMS;
}
@Override
public String value() {
return this.value;
}
@Override
public String valueToMatch() {
return this.valueToMatch;
}
@Override
public char[] valueToMatchAsChars() {
return this.valueToMatchAsChars;
}
@Override
public MultiValueMap parameters() {
return this.parameters;
}
@Override
public boolean equals(@Nullable Object other) {
if (this == other) {
return true;
}
if (!(other instanceof PathSegment)) {
return false;
}
return value().equals(((PathSegment) other).value());
}
@Override
public int hashCode() {
return this.value.hashCode();
}
@Override
public String toString() {
return "[value='" + this.value + "']";
}
}
}
