org.springframework.http.server.reactive.TomcatHeadersAdapter Maven / Gradle / Ivy
/*
* 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.http.server.reactive;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.tomcat.util.buf.MessageBytes;
import org.apache.tomcat.util.http.MimeHeaders;
import org.springframework.http.HttpHeaders;
import org.springframework.lang.Nullable;
import org.springframework.util.CollectionUtils;
import org.springframework.util.MultiValueMap;
/**
* {@code MultiValueMap} implementation for wrapping Tomcat HTTP headers.
*
* @author Brian Clozel
* @author Sam Brannen
* @since 5.1.1
*/
class TomcatHeadersAdapter implements MultiValueMap {
private final MimeHeaders headers;
TomcatHeadersAdapter(MimeHeaders headers) {
this.headers = headers;
}
@Override
public String getFirst(String key) {
return this.headers.getHeader(key);
}
@Override
public void add(String key, @Nullable String value) {
this.headers.addValue(key).setString(value);
}
@Override
public void addAll(String key, List values) {
values.forEach(value -> add(key, value));
}
@Override
public void addAll(MultiValueMap values) {
values.forEach(this::addAll);
}
@Override
public void set(String key, @Nullable String value) {
this.headers.setValue(key).setString(value);
}
@Override
public void setAll(Map values) {
values.forEach(this::set);
}
@Override
public Map toSingleValueMap() {
Map singleValueMap = CollectionUtils.newLinkedHashMap(this.headers.size());
this.keySet().forEach(key -> singleValueMap.put(key, getFirst(key)));
return singleValueMap;
}
@Override
public int size() {
Enumeration names = this.headers.names();
int size = 0;
while (names.hasMoreElements()) {
size++;
names.nextElement();
}
return size;
}
@Override
public boolean isEmpty() {
return (this.headers.size() == 0);
}
@Override
public boolean containsKey(Object key) {
if (key instanceof String headerName) {
return (this.headers.findHeader(headerName, 0) != -1);
}
return false;
}
@Override
public boolean containsValue(Object value) {
if (value instanceof String text) {
MessageBytes messageBytes = MessageBytes.newInstance();
messageBytes.setString(text);
for (int i = 0; i < this.headers.size(); i++) {
if (this.headers.getValue(i).equals(messageBytes)) {
return true;
}
}
}
return false;
}
@Override
@Nullable
public List get(Object key) {
if (containsKey(key)) {
return Collections.list(this.headers.values((String) key));
}
return null;
}
@Override
@Nullable
public List put(String key, List value) {
List previousValues = get(key);
this.headers.removeHeader(key);
value.forEach(v -> this.headers.addValue(key).setString(v));
return previousValues;
}
@Override
@Nullable
public List remove(Object key) {
if (key instanceof String headerName) {
List previousValues = get(key);
this.headers.removeHeader(headerName);
return previousValues;
}
return null;
}
@Override
public void putAll(Map> map) {
map.forEach(this::put);
}
@Override
public void clear() {
this.headers.clear();
}
@Override
public Set keySet() {
return new HeaderNames();
}
@Override
public Collection> values() {
return keySet().stream().map(this::get).toList();
}
@Override
public Set>> entrySet() {
return new AbstractSet<>() {
@Override
public Iterator>> iterator() {
return new EntryIterator();
}
@Override
public int size() {
return headers.size();
}
};
}
@Override
public String toString() {
return HttpHeaders.formatHeaders(this);
}
private class EntryIterator implements Iterator>> {
private final Enumeration names = headers.names();
@Override
public boolean hasNext() {
return this.names.hasMoreElements();
}
@Override
public Entry> next() {
return new HeaderEntry(this.names.nextElement());
}
}
private final class HeaderEntry implements Entry> {
private final String key;
HeaderEntry(String key) {
this.key = key;
}
@Override
public String getKey() {
return this.key;
}
@Nullable
@Override
public List getValue() {
return get(this.key);
}
@Nullable
@Override
public List setValue(List value) {
List previous = getValue();
headers.removeHeader(this.key);
addAll(this.key, value);
return previous;
}
}
private class HeaderNames extends AbstractSet {
@Override
public Iterator iterator() {
return new HeaderNamesIterator(headers.names());
}
@Override
public int size() {
Enumeration names = headers.names();
int size = 0;
while (names.hasMoreElements()) {
names.nextElement();
size++;
}
return size;
}
}
private final class HeaderNamesIterator implements Iterator {
private final Enumeration enumeration;
@Nullable
private String currentName;
private HeaderNamesIterator(Enumeration enumeration) {
this.enumeration = enumeration;
}
@Override
public boolean hasNext() {
return this.enumeration.hasMoreElements();
}
@Override
public String next() {
this.currentName = this.enumeration.nextElement();
return this.currentName;
}
@Override
public void remove() {
if (this.currentName == null) {
throw new IllegalStateException("No current Header in iterator");
}
int index = headers.findHeader(this.currentName, 0);
if (index == -1) {
throw new IllegalStateException("Header not present: " + this.currentName);
}
headers.removeHeader(index);
}
}
}