/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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
*
* http://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.apache.tomcat.util.http.parser;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
public class Upgrade {
private final String protocolName;
private final String protocolVersion;
private Upgrade(String protocolName, String protocolVersion) {
this.protocolName = protocolName;
this.protocolVersion = protocolVersion;
}
public String getProtocolName() {
return protocolName;
}
public String getProtocolVersion() {
return protocolVersion;
}
@Override
public String toString() {
if (protocolVersion == null) {
return protocolName;
} else {
return protocolName + "/" + protocolVersion;
}
}
public static List<Upgrade> parse(Enumeration<String> headerValues) {
try {
List<Upgrade> result = new ArrayList<>();
while (headerValues.hasMoreElements()) {
String headerValue = headerValues.nextElement();
if (headerValue == null) {
// Invalid
return null;
}
Reader r = new StringReader(headerValue);
SkipResult skipComma;
do {
// Skip any leading LWS
HttpParser.skipLws(r);
String protocolName = HttpParser.readToken(r);
if (protocolName == null || protocolName.isEmpty()) {
// Invalid
return null;
}
String protocolVersion = null;
if (HttpParser.skipConstant(r, "/") == SkipResult.FOUND) {
protocolVersion = HttpParser.readToken(r);
if (protocolVersion == null || protocolVersion.isEmpty()) {
// Invalid
return null;
}
}
HttpParser.skipLws(r);
skipComma = HttpParser.skipConstant(r, ",");
if (skipComma == SkipResult.NOT_FOUND) {
// Invalid
return null;
}
result.add(new Upgrade(protocolName, protocolVersion));
// SkipResult.EOF will exit this inner loop
} while (skipComma == SkipResult.FOUND);
}
return result;
} catch (IOException ioe) {
// Should never happen with Strings
return null;
}
}
}