--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/Http1HeaderParser.java Sun Nov 05 17:32:13 2017 +0000
@@ -0,0 +1,257 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.incubator.http;
+
+import java.net.ProtocolException;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import static java.lang.String.format;
+import static java.util.Objects.requireNonNull;
+
+class Http1HeaderParser {
+
+ private static final char CR = '\r';
+ private static final char LF = '\n';
+ private static final char HT = '\t';
+ private static final char SP = ' ';
+
+ private StringBuilder sb = new StringBuilder();
+ private String statusLine;
+ private int responseCode;
+ private HttpHeaders headers;
+ private Map<String,List<String>> privateMap = new HashMap<>();
+
+ enum State { STATUS_LINE,
+ STATUS_LINE_FOUND_CR,
+ STATUS_LINE_END,
+ STATUS_LINE_END_CR,
+ HEADER,
+ HEADER_FOUND_CR,
+ HEADER_FOUND_LF,
+ HEADER_FOUND_CR_LF,
+ HEADER_FOUND_CR_LF_CR,
+ FINISHED }
+
+ private State state = State.STATUS_LINE;
+
+ /** Returns the status-line. */
+ String statusLine() { return statusLine; }
+
+ /** Returns the response code. */
+ int responseCode() { return responseCode; }
+
+ /** Returns the headers, possibly empty. */
+ HttpHeaders headers() { assert state == State.FINISHED; return headers; }
+
+ /**
+ * Parses HTTP/1.X status-line and headers from the given bytes. Must be
+ * called successive times, with additional data, until returns true.
+ *
+ * All given ByteBuffers will be consumed, until ( possibly ) the last one
+ * ( when true is returned ), which may not be fully consumed.
+ *
+ * @param input the ( partial ) header data
+ * @return true iff the end of the headers block has been reached
+ */
+ boolean parse(ByteBuffer input) throws ProtocolException {
+ requireNonNull(input, "null input");
+
+ while (input.hasRemaining() && state != State.FINISHED) {
+ switch (state) {
+ case STATUS_LINE:
+ readResumeStatusLine(input);
+ break;
+ case STATUS_LINE_FOUND_CR:
+ readStatusLineFeed(input);
+ break;
+ case STATUS_LINE_END:
+ maybeStartHeaders(input);
+ break;
+ case STATUS_LINE_END_CR:
+ maybeEndHeaders(input);
+ break;
+ case HEADER:
+ readResumeHeader(input);
+ break;
+ // fallthrough
+ case HEADER_FOUND_CR:
+ case HEADER_FOUND_LF:
+ resumeOrLF(input);
+ break;
+ case HEADER_FOUND_CR_LF:
+ resumeOrSecondCR(input);
+ break;
+ case HEADER_FOUND_CR_LF_CR:
+ resumeOrEndHeaders(input);
+ break;
+ default:
+ throw new InternalError(
+ "Unexpected state: " + String.valueOf(state));
+ }
+ }
+
+ return state == State.FINISHED;
+ }
+
+ private void readResumeStatusLine(ByteBuffer input) {
+ char c = 0;
+ while (input.hasRemaining() && (c =(char)input.get()) != CR) {
+ sb.append(c);
+ }
+
+ if (c == CR) {
+ state = State.STATUS_LINE_FOUND_CR;
+ }
+ }
+
+ private void readStatusLineFeed(ByteBuffer input) throws ProtocolException {
+ char c = (char)input.get();
+ if (c != LF) {
+ throw protocolException("Bad trailing char, \"%s\", when parsing status-line, \"%s\"",
+ c, sb.toString());
+ }
+
+ statusLine = sb.toString();
+ sb = new StringBuilder();
+ if (!statusLine.startsWith("HTTP/1.")) {
+ throw protocolException("Invalid status line: \"%s\"", statusLine);
+ }
+ if (statusLine.length() < 12) {
+ throw protocolException("Invalid status line: \"%s\"", statusLine);
+ }
+ responseCode = Integer.parseInt(statusLine.substring(9, 12));
+
+ state = State.STATUS_LINE_END;
+ }
+
+ private void maybeStartHeaders(ByteBuffer input) {
+ assert state == State.STATUS_LINE_END;
+ assert sb.length() == 0;
+ char c = (char)input.get();
+ if (c == CR) {
+ state = State.STATUS_LINE_END_CR;
+ } else {
+ sb.append(c);
+ state = State.HEADER;
+ }
+ }
+
+ private void maybeEndHeaders(ByteBuffer input) throws ProtocolException {
+ assert state == State.STATUS_LINE_END_CR;
+ assert sb.length() == 0;
+ char c = (char)input.get();
+ if (c == LF) {
+ headers = ImmutableHeaders.of(privateMap);
+ privateMap = null;
+ state = State.FINISHED; // no headers
+ } else {
+ throw protocolException("Unexpected \"%s\", after status-line CR", c);
+ }
+ }
+
+ private void readResumeHeader(ByteBuffer input) {
+ assert state == State.HEADER;
+ assert input.hasRemaining();
+ while (input.hasRemaining()) {
+ char c = (char)input.get();
+ if (c == CR) {
+ state = State.HEADER_FOUND_CR;
+ break;
+ } else if (c == LF) {
+ state = State.HEADER_FOUND_LF;
+ break;
+ }
+
+ if (c == HT)
+ c = SP;
+ sb.append(c);
+ }
+ }
+
+ private void addHeaderFromString(String headerString) {
+ assert sb.length() == 0;
+ int idx = headerString.indexOf(':');
+ if (idx == -1)
+ return;
+ String name = headerString.substring(0, idx).trim();
+ if (name.isEmpty())
+ return;
+ String value = headerString.substring(idx + 1, headerString.length()).trim();
+
+ privateMap.computeIfAbsent(name.toLowerCase(Locale.US),
+ k -> new ArrayList<>()).add(value);
+ }
+
+ private void resumeOrLF(ByteBuffer input) {
+ assert state == State.HEADER_FOUND_CR || state == State.HEADER_FOUND_LF;
+ char c = (char)input.get();
+ if (c == LF && state == State.HEADER_FOUND_CR) {
+ String headerString = sb.toString();
+ sb = new StringBuilder();
+ addHeaderFromString(headerString);
+ state = State.HEADER_FOUND_CR_LF;
+ } else if (c == SP || c == HT) {
+ sb.append(SP); // parity with MessageHeaders
+ state = State.HEADER;
+ } else {
+ sb = new StringBuilder();
+ sb.append(c);
+ state = State.HEADER;
+ }
+ }
+
+ private void resumeOrSecondCR(ByteBuffer input) {
+ assert state == State.HEADER_FOUND_CR_LF;
+ assert sb.length() == 0;
+ char c = (char)input.get();
+ if (c == CR) {
+ state = State.HEADER_FOUND_CR_LF_CR;
+ } else {
+ sb.append(c);
+ state = State.HEADER;
+ }
+ }
+
+ private void resumeOrEndHeaders(ByteBuffer input) throws ProtocolException {
+ assert state == State.HEADER_FOUND_CR_LF_CR;
+ char c = (char)input.get();
+ if (c == LF) {
+ state = State.FINISHED;
+ headers = ImmutableHeaders.of(privateMap);
+ privateMap = null;
+ } else {
+ throw protocolException("Unexpected \"%s\", after CR LF CR", c);
+ }
+ }
+
+ private ProtocolException protocolException(String format, Object... args) {
+ return new ProtocolException(format(format, args));
+ }
+}