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org.springframework.http.server.DefaultPathContainer Maven / Gradle / Ivy
/*
* Copyright 2002-2018 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.List;
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_MAP = new LinkedMultiValueMap<>();
private static final PathContainer EMPTY_PATH = new DefaultPathContainer("", Collections.emptyList());
private static final PathContainer.Separator SEPARATOR = () -> "/";
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 == null || getClass() != other.getClass()) {
return false;
}
return this.path.equals(((DefaultPathContainer) other).path);
}
@Override
public int hashCode() {
return this.path.hashCode();
}
@Override
public String toString() {
return value();
}
static PathContainer createFromUrlPath(String path) {
if (path.equals("")) {
return EMPTY_PATH;
}
String separator = "/";
Separator separatorElement = separator.equals(SEPARATOR.value()) ? SEPARATOR : () -> separator;
List elements = new ArrayList<>();
int begin;
if (path.length() > 0 && path.startsWith(separator)) {
begin = separator.length();
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.equals("")) {
elements.add(parsePathSegment(segment));
}
if (end == -1) {
break;
}
elements.add(separatorElement);
begin = end + separator.length();
}
return new DefaultPathContainer(path, elements);
}
private static PathSegment parsePathSegment(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_MAP);
}
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 DefaultPathSegment implements PathSegment {
private final String value;
private final String valueToMatch;
private final char[] valueToMatchAsChars;
private final MultiValueMap parameters;
public DefaultPathSegment(String value, String valueToMatch, MultiValueMap params) {
Assert.isTrue(!value.contains("/"), () -> "Invalid path segment value: " + value);
this.value = value;
this.valueToMatch = valueToMatch;
this.valueToMatchAsChars = valueToMatch.toCharArray();
this.parameters = CollectionUtils.unmodifiableMultiValueMap(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 == null || getClass() != other.getClass()) {
return false;
}
return this.value.equals(((DefaultPathSegment) other).value);
}
@Override
public int hashCode() {
return this.value.hashCode();
}
public String toString() {
return "[value='" + this.value + "']";
}
}
}