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/*
* Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This source code is provided to illustrate the usage of a given feature
* or technique and has been deliberately simplified. Additional steps
* required for a production-quality application, such as security checks,
* input validation and proper error handling, might not be present in
* this sample code.
*/
import java.net.*;
import java.nio.*;
import java.nio.charset.*;
import java.util.regex.*;
/**
* An encapsulation of the request received.
* <P>
* The static method parse() is responsible for creating this
* object.
*
* @author Mark Reinhold
* @author Brad R. Wetmore
*/
class Request {
/**
* A helper class for parsing HTTP command actions.
*/
static class Action {
private String name;
private Action(String name) { this.name = name; }
public String toString() { return name; }
static Action GET = new Action("GET");
static Action PUT = new Action("PUT");
static Action POST = new Action("POST");
static Action HEAD = new Action("HEAD");
static Action parse(String s) {
if (s.equals("GET"))
return GET;
if (s.equals("PUT"))
return PUT;
if (s.equals("POST"))
return POST;
if (s.equals("HEAD"))
return HEAD;
throw new IllegalArgumentException(s);
}
}
private Action action;
private String version;
private URI uri;
Action action() { return action; }
String version() { return version; }
URI uri() { return uri; }
private Request(Action a, String v, URI u) {
action = a;
version = v;
uri = u;
}
public String toString() {
return (action + " " + version + " " + uri);
}
static boolean isComplete(ByteBuffer bb) {
int p = bb.position() - 4;
if (p < 0)
return false;
return (((bb.get(p + 0) == '\r') &&
(bb.get(p + 1) == '\n') &&
(bb.get(p + 2) == '\r') &&
(bb.get(p + 3) == '\n')));
}
private static Charset ascii = Charset.forName("US-ASCII");
/*
* The expected message format is first compiled into a pattern,
* and is then compared against the inbound character buffer to
* determine if there is a match. This convienently tokenizes
* our request into usable pieces.
*
* This uses Matcher "expression capture groups" to tokenize
* requests like:
*
* GET /dir/file HTTP/1.1
* Host: hostname
*
* into:
*
* group[1] = "GET"
* group[2] = "/dir/file"
* group[3] = "1.1"
* group[4] = "hostname"
*
* The text in between the parens are used to captured the regexp text.
*/
private static Pattern requestPattern
= Pattern.compile("\\A([A-Z]+) +([^ ]+) +HTTP/([0-9\\.]+)$"
+ ".*^Host: ([^ ]+)$.*\r\n\r\n\\z",
Pattern.MULTILINE | Pattern.DOTALL);
static Request parse(ByteBuffer bb) throws MalformedRequestException {
CharBuffer cb = ascii.decode(bb);
Matcher m = requestPattern.matcher(cb);
if (!m.matches())
throw new MalformedRequestException();
Action a;
try {
a = Action.parse(m.group(1));
} catch (IllegalArgumentException x) {
throw new MalformedRequestException();
}
URI u;
try {
u = new URI("http://"
+ m.group(4)
+ m.group(2));
} catch (URISyntaxException x) {
throw new MalformedRequestException();
}
return new Request(a, m.group(3), u);
}
}
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