J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * |
| 8 | * - Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * - Neither the name of Sun Microsystems nor the names of its |
| 16 | * contributors may be used to endorse or promote products derived |
| 17 | * from this software without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| 20 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| 21 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| 23 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 24 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 25 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 26 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 27 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 28 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 29 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | import java.net.*; |
| 33 | import java.nio.*; |
| 34 | import java.nio.charset.*; |
| 35 | import java.util.regex.*; |
| 36 | |
| 37 | /** |
| 38 | * An encapsulation of the request received. |
| 39 | * <P> |
| 40 | * The static method parse() is responsible for creating this |
| 41 | * object. |
| 42 | * |
| 43 | * @author Mark Reinhold |
| 44 | * @author Brad R. Wetmore |
| 45 | */ |
| 46 | class Request { |
| 47 | |
| 48 | /** |
| 49 | * A helper class for parsing HTTP command actions. |
| 50 | */ |
| 51 | static class Action { |
| 52 | |
| 53 | private String name; |
| 54 | private Action(String name) { this.name = name; } |
| 55 | public String toString() { return name; } |
| 56 | |
| 57 | static Action GET = new Action("GET"); |
| 58 | static Action PUT = new Action("PUT"); |
| 59 | static Action POST = new Action("POST"); |
| 60 | static Action HEAD = new Action("HEAD"); |
| 61 | |
| 62 | static Action parse(String s) { |
| 63 | if (s.equals("GET")) |
| 64 | return GET; |
| 65 | if (s.equals("PUT")) |
| 66 | return PUT; |
| 67 | if (s.equals("POST")) |
| 68 | return POST; |
| 69 | if (s.equals("HEAD")) |
| 70 | return HEAD; |
| 71 | throw new IllegalArgumentException(s); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | private Action action; |
| 76 | private String version; |
| 77 | private URI uri; |
| 78 | |
| 79 | Action action() { return action; } |
| 80 | String version() { return version; } |
| 81 | URI uri() { return uri; } |
| 82 | |
| 83 | private Request(Action a, String v, URI u) { |
| 84 | action = a; |
| 85 | version = v; |
| 86 | uri = u; |
| 87 | } |
| 88 | |
| 89 | public String toString() { |
| 90 | return (action + " " + version + " " + uri); |
| 91 | } |
| 92 | |
| 93 | static boolean isComplete(ByteBuffer bb) { |
| 94 | int p = bb.position() - 4; |
| 95 | if (p < 0) |
| 96 | return false; |
| 97 | return (((bb.get(p + 0) == '\r') && |
| 98 | (bb.get(p + 1) == '\n') && |
| 99 | (bb.get(p + 2) == '\r') && |
| 100 | (bb.get(p + 3) == '\n'))); |
| 101 | } |
| 102 | |
| 103 | private static Charset ascii = Charset.forName("US-ASCII"); |
| 104 | |
| 105 | /* |
| 106 | * The expected message format is first compiled into a pattern, |
| 107 | * and is then compared against the inbound character buffer to |
| 108 | * determine if there is a match. This convienently tokenizes |
| 109 | * our request into usable pieces. |
| 110 | * |
| 111 | * This uses Matcher "expression capture groups" to tokenize |
| 112 | * requests like: |
| 113 | * |
| 114 | * GET /dir/file HTTP/1.1 |
| 115 | * Host: hostname |
| 116 | * |
| 117 | * into: |
| 118 | * |
| 119 | * group[1] = "GET" |
| 120 | * group[2] = "/dir/file" |
| 121 | * group[3] = "1.1" |
| 122 | * group[4] = "hostname" |
| 123 | * |
| 124 | * The text in between the parens are used to captured the regexp text. |
| 125 | */ |
| 126 | private static Pattern requestPattern |
| 127 | = Pattern.compile("\\A([A-Z]+) +([^ ]+) +HTTP/([0-9\\.]+)$" |
| 128 | + ".*^Host: ([^ ]+)$.*\r\n\r\n\\z", |
| 129 | Pattern.MULTILINE | Pattern.DOTALL); |
| 130 | |
| 131 | static Request parse(ByteBuffer bb) throws MalformedRequestException { |
| 132 | |
| 133 | CharBuffer cb = ascii.decode(bb); |
| 134 | Matcher m = requestPattern.matcher(cb); |
| 135 | if (!m.matches()) |
| 136 | throw new MalformedRequestException(); |
| 137 | Action a; |
| 138 | try { |
| 139 | a = Action.parse(m.group(1)); |
| 140 | } catch (IllegalArgumentException x) { |
| 141 | throw new MalformedRequestException(); |
| 142 | } |
| 143 | URI u; |
| 144 | try { |
| 145 | u = new URI("http://" |
| 146 | + m.group(4) |
| 147 | + m.group(2)); |
| 148 | } catch (URISyntaxException x) { |
| 149 | throw new MalformedRequestException(); |
| 150 | } |
| 151 | return new Request(a, m.group(3), u); |
| 152 | } |
| 153 | } |