/*
* 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 org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.buf.MessageBytes;
public class Host {
private Host() {
// Utility class. Hide default constructor.
}
/**
* Parse the given input as an HTTP Host header value.
*
* @param mb The host header value
*
* @return The position of ':' that separates the host from the port or -1 if it is not present
*
* @throws IllegalArgumentException If the host header value is not specification compliant
*/
public static int parse(MessageBytes mb) {
return parse(new MessageBytesReader(mb));
}
/**
* Parse the given input as an HTTP Host header value.
*
* @param string The host header value
*
* @return The position of ':' that separates the host from the port or -1 if it is not present
*
* @throws IllegalArgumentException If the host header value is not specification compliant
*/
public static int parse(String string) {
return parse(new StringReader(string));
}
private static int parse(Reader reader) {
try {
reader.mark(1);
int first = reader.read();
reader.reset();
if (HttpParser.isAlpha(first)) {
return HttpParser.readHostDomainName(reader);
} else if (HttpParser.isNumeric(first)) {
return HttpParser.readHostIPv4(reader, false);
} else if ('[' == first) {
return HttpParser.readHostIPv6(reader);
} else {
// Invalid
throw new IllegalArgumentException();
}
} catch (IOException ioe) {
// Should never happen
throw new IllegalArgumentException(ioe);
}
}
private static class MessageBytesReader extends Reader {
private final byte[] bytes;
private final int end;
private int pos;
private int mark;
MessageBytesReader(MessageBytes mb) {
ByteChunk bc = mb.getByteChunk();
bytes = bc.getBytes();
pos = bc.getStart();
end = bc.getEnd();
}
@Override
public int read(char[] cbuf, int off, int len) throws IOException {
for (int i = off; i < off + len; i++) {
// Want output in range 0 to 255, not -128 to 127
cbuf[i] = (char) (bytes[pos++] & 0xFF);
}
return len;
}
@Override
public void close() throws IOException {
// NO-OP
}
// Over-ridden methods to improve performance
@Override
public int read() throws IOException {
if (pos < end) {
// Want output in range 0 to 255, not -128 to 127
return bytes[pos++] & 0xFF;
} else {
return -1;
}
}
// Methods to support mark/reset
@Override
public boolean markSupported() {
return true;
}
@Override
public void mark(int readAheadLimit) throws IOException {
mark = pos;
}
@Override
public void reset() throws IOException {
pos = mark;
}
}
}