1package com.google.polo.json;
2
3/*
4Copyright (c) 2002 JSON.org
5
6Permission is hereby granted, free of charge, to any person obtaining a copy
7of this software and associated documentation files (the "Software"), to deal
8in the Software without restriction, including without limitation the rights
9to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10copies of the Software, and to permit persons to whom the Software is
11furnished to do so, subject to the following conditions:
12
13The above copyright notice and this permission notice shall be included in all
14copies or substantial portions of the Software.
15
16The Software shall be used for Good, not Evil.
17
18THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24SOFTWARE.
25*/
26
27import java.util.Iterator;
28
29/**
30 * Convert an HTTP header to a JSONObject and back.
31 * @author JSON.org
32 * @version 2008-09-18
33 */
34public class HTTP {
35
36    /** Carriage return/line feed. */
37    public static final String CRLF = "\r\n";
38
39    /**
40     * Convert an HTTP header string into a JSONObject. It can be a request
41     * header or a response header. A request header will contain
42     * <pre>{
43     *    Method: "POST" (for example),
44     *    "Request-URI": "/" (for example),
45     *    "HTTP-Version": "HTTP/1.1" (for example)
46     * }</pre>
47     * A response header will contain
48     * <pre>{
49     *    "HTTP-Version": "HTTP/1.1" (for example),
50     *    "Status-Code": "200" (for example),
51     *    "Reason-Phrase": "OK" (for example)
52     * }</pre>
53     * In addition, the other parameters in the header will be captured, using
54     * the HTTP field names as JSON names, so that <pre>
55     *    Date: Sun, 26 May 2002 18:06:04 GMT
56     *    Cookie: Q=q2=PPEAsg--; B=677gi6ouf29bn&b=2&f=s
57     *    Cache-Control: no-cache</pre>
58     * become
59     * <pre>{...
60     *    Date: "Sun, 26 May 2002 18:06:04 GMT",
61     *    Cookie: "Q=q2=PPEAsg--; B=677gi6ouf29bn&b=2&f=s",
62     *    "Cache-Control": "no-cache",
63     * ...}</pre>
64     * It does no further checking or conversion. It does not parse dates.
65     * It does not do '%' transforms on URLs.
66     * @param string An HTTP header string.
67     * @return A JSONObject containing the elements and attributes
68     * of the XML string.
69     * @throws JSONException
70     */
71    public static JSONObject toJSONObject(String string) throws JSONException {
72        JSONObject     o = new JSONObject();
73        HTTPTokener    x = new HTTPTokener(string);
74        String         t;
75
76        t = x.nextToken();
77        if (t.toUpperCase().startsWith("HTTP")) {
78
79// Response
80
81            o.put("HTTP-Version", t);
82            o.put("Status-Code", x.nextToken());
83            o.put("Reason-Phrase", x.nextTo('\0'));
84            x.next();
85
86        } else {
87
88// Request
89
90            o.put("Method", t);
91            o.put("Request-URI", x.nextToken());
92            o.put("HTTP-Version", x.nextToken());
93        }
94
95// Fields
96
97        while (x.more()) {
98            String name = x.nextTo(':');
99            x.next(':');
100            o.put(name, x.nextTo('\0'));
101            x.next();
102        }
103        return o;
104    }
105
106
107    /**
108     * Convert a JSONObject into an HTTP header. A request header must contain
109     * <pre>{
110     *    Method: "POST" (for example),
111     *    "Request-URI": "/" (for example),
112     *    "HTTP-Version": "HTTP/1.1" (for example)
113     * }</pre>
114     * A response header must contain
115     * <pre>{
116     *    "HTTP-Version": "HTTP/1.1" (for example),
117     *    "Status-Code": "200" (for example),
118     *    "Reason-Phrase": "OK" (for example)
119     * }</pre>
120     * Any other members of the JSONObject will be output as HTTP fields.
121     * The result will end with two CRLF pairs.
122     * @param o A JSONObject
123     * @return An HTTP header string.
124     * @throws JSONException if the object does not contain enough
125     *  information.
126     */
127    public static String toString(JSONObject o) throws JSONException {
128        Iterator     keys = o.keys();
129        String       s;
130        StringBuffer sb = new StringBuffer();
131        if (o.has("Status-Code") && o.has("Reason-Phrase")) {
132            sb.append(o.getString("HTTP-Version"));
133            sb.append(' ');
134            sb.append(o.getString("Status-Code"));
135            sb.append(' ');
136            sb.append(o.getString("Reason-Phrase"));
137        } else if (o.has("Method") && o.has("Request-URI")) {
138            sb.append(o.getString("Method"));
139            sb.append(' ');
140            sb.append('"');
141            sb.append(o.getString("Request-URI"));
142            sb.append('"');
143            sb.append(' ');
144            sb.append(o.getString("HTTP-Version"));
145        } else {
146            throw new JSONException("Not enough material for an HTTP header.");
147        }
148        sb.append(CRLF);
149        while (keys.hasNext()) {
150            s = keys.next().toString();
151            if (!s.equals("HTTP-Version")      && !s.equals("Status-Code") &&
152                    !s.equals("Reason-Phrase") && !s.equals("Method") &&
153                    !s.equals("Request-URI")   && !o.isNull(s)) {
154                sb.append(s);
155                sb.append(": ");
156                sb.append(o.getString(s));
157                sb.append(CRLF);
158            }
159        }
160        sb.append(CRLF);
161        return sb.toString();
162    }
163}
164