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/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.incubator.http;
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import java.net.ProtocolException;
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import java.nio.ByteBuffer;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Locale;
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import java.util.Map;
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import static java.lang.String.format;
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import static java.util.Objects.requireNonNull;
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class Http1HeaderParser {
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private static final char CR = '\r';
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private static final char LF = '\n';
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private static final char HT = '\t';
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private static final char SP = ' ';
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private StringBuilder sb = new StringBuilder();
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private String statusLine;
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private int responseCode;
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private HttpHeaders headers;
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private Map<String,List<String>> privateMap = new HashMap<>();
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enum State { STATUS_LINE,
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STATUS_LINE_FOUND_CR,
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STATUS_LINE_END,
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STATUS_LINE_END_CR,
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HEADER,
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HEADER_FOUND_CR,
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HEADER_FOUND_LF,
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HEADER_FOUND_CR_LF,
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HEADER_FOUND_CR_LF_CR,
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FINISHED }
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private State state = State.STATUS_LINE;
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/** Returns the status-line. */
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String statusLine() { return statusLine; }
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/** Returns the response code. */
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int responseCode() { return responseCode; }
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/** Returns the headers, possibly empty. */
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HttpHeaders headers() { assert state == State.FINISHED; return headers; }
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/**
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* Parses HTTP/1.X status-line and headers from the given bytes. Must be
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* called successive times, with additional data, until returns true.
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*
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* All given ByteBuffers will be consumed, until ( possibly ) the last one
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* ( when true is returned ), which may not be fully consumed.
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*
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* @param input the ( partial ) header data
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* @return true iff the end of the headers block has been reached
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*/
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boolean parse(ByteBuffer input) throws ProtocolException {
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requireNonNull(input, "null input");
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while (input.hasRemaining() && state != State.FINISHED) {
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switch (state) {
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case STATUS_LINE:
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readResumeStatusLine(input);
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break;
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case STATUS_LINE_FOUND_CR:
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readStatusLineFeed(input);
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break;
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case STATUS_LINE_END:
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maybeStartHeaders(input);
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break;
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case STATUS_LINE_END_CR:
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maybeEndHeaders(input);
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break;
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case HEADER:
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readResumeHeader(input);
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break;
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// fallthrough
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case HEADER_FOUND_CR:
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case HEADER_FOUND_LF:
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resumeOrLF(input);
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break;
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case HEADER_FOUND_CR_LF:
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resumeOrSecondCR(input);
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break;
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case HEADER_FOUND_CR_LF_CR:
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resumeOrEndHeaders(input);
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break;
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default:
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throw new InternalError(
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"Unexpected state: " + String.valueOf(state));
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}
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}
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return state == State.FINISHED;
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}
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private void readResumeStatusLine(ByteBuffer input) {
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char c = 0;
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while (input.hasRemaining() && (c =(char)input.get()) != CR) {
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sb.append(c);
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}
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if (c == CR) {
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state = State.STATUS_LINE_FOUND_CR;
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}
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}
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private void readStatusLineFeed(ByteBuffer input) throws ProtocolException {
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char c = (char)input.get();
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if (c != LF) {
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throw protocolException("Bad trailing char, \"%s\", when parsing status-line, \"%s\"",
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c, sb.toString());
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}
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statusLine = sb.toString();
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sb = new StringBuilder();
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if (!statusLine.startsWith("HTTP/1.")) {
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throw protocolException("Invalid status line: \"%s\"", statusLine);
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}
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if (statusLine.length() < 12) {
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throw protocolException("Invalid status line: \"%s\"", statusLine);
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}
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responseCode = Integer.parseInt(statusLine.substring(9, 12));
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state = State.STATUS_LINE_END;
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}
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private void maybeStartHeaders(ByteBuffer input) {
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assert state == State.STATUS_LINE_END;
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assert sb.length() == 0;
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char c = (char)input.get();
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if (c == CR) {
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state = State.STATUS_LINE_END_CR;
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} else {
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sb.append(c);
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state = State.HEADER;
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}
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}
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private void maybeEndHeaders(ByteBuffer input) throws ProtocolException {
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assert state == State.STATUS_LINE_END_CR;
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assert sb.length() == 0;
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char c = (char)input.get();
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if (c == LF) {
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headers = ImmutableHeaders.of(privateMap);
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privateMap = null;
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state = State.FINISHED; // no headers
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} else {
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throw protocolException("Unexpected \"%s\", after status-line CR", c);
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}
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}
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private void readResumeHeader(ByteBuffer input) {
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assert state == State.HEADER;
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assert input.hasRemaining();
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while (input.hasRemaining()) {
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char c = (char)input.get();
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if (c == CR) {
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state = State.HEADER_FOUND_CR;
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break;
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} else if (c == LF) {
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state = State.HEADER_FOUND_LF;
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break;
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}
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if (c == HT)
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c = SP;
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sb.append(c);
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}
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}
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private void addHeaderFromString(String headerString) {
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assert sb.length() == 0;
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int idx = headerString.indexOf(':');
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if (idx == -1)
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return;
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String name = headerString.substring(0, idx).trim();
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if (name.isEmpty())
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return;
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String value = headerString.substring(idx + 1, headerString.length()).trim();
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privateMap.computeIfAbsent(name.toLowerCase(Locale.US),
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k -> new ArrayList<>()).add(value);
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}
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private void resumeOrLF(ByteBuffer input) {
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assert state == State.HEADER_FOUND_CR || state == State.HEADER_FOUND_LF;
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char c = (char)input.get();
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if (c == LF && state == State.HEADER_FOUND_CR) {
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String headerString = sb.toString();
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sb = new StringBuilder();
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addHeaderFromString(headerString);
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state = State.HEADER_FOUND_CR_LF;
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} else if (c == SP || c == HT) {
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sb.append(SP); // parity with MessageHeaders
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state = State.HEADER;
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} else {
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sb = new StringBuilder();
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sb.append(c);
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state = State.HEADER;
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}
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}
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private void resumeOrSecondCR(ByteBuffer input) {
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assert state == State.HEADER_FOUND_CR_LF;
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assert sb.length() == 0;
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char c = (char)input.get();
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if (c == CR) {
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state = State.HEADER_FOUND_CR_LF_CR;
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} else {
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sb.append(c);
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state = State.HEADER;
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}
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}
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private void resumeOrEndHeaders(ByteBuffer input) throws ProtocolException {
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assert state == State.HEADER_FOUND_CR_LF_CR;
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char c = (char)input.get();
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if (c == LF) {
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state = State.FINISHED;
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headers = ImmutableHeaders.of(privateMap);
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privateMap = null;
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} else {
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throw protocolException("Unexpected \"%s\", after CR LF CR", c);
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}
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}
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private ProtocolException protocolException(String format, Object... args) {
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return new ProtocolException(format(format, args));
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}
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}
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