package org.json;/*Copyright (c) 2002 JSON.orgPermission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.The Software shall be used for Good, not Evil.THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.*/import java.util.Iterator;import java.util.NoSuchElementException;import java.text.ParseException;/** * Convert an HTTP header to a JSONObject and back. * @author JSON.org * @version 0.1 */public class HTTP {    private HTTP() {}    /** Carriage return/line feed. */    public static final String CRLF = "\r\n";    /**     * Convert an HTTP header string into a JSONObject. It can be a request     * header or a response header. A request header will contain     * <pre>{     *    Method: "POST" (for example),     *    "Request-URI": "/" (for example),     *    "HTTP-Version": "HTTP/1.1" (for example)     * }</pre>     * A response header will contain     * <pre>{     *    "HTTP-Version": "HTTP/1.1" (for example),     *    "Status-Code": "200" (for example),     *    "Reason-Phrase": "OK" (for example)     * }</pre>     * In addition, the other parameters in the header will be captured, using     * the HTTP field names as JSON names, so that <pre>     *    Date: Sun, 26 May 2002 18:06:04 GMT     *    Cookie: Q=q2=PPEAsg--; B=677gi6ouf29bn&b=2&f=s     *    Cache-Control: no-cache</pre>     * become     * <pre>{...     *    Date: "Sun, 26 May 2002 18:06:04 GMT",     *    Cookie: "Q=q2=PPEAsg--; B=677gi6ouf29bn&b=2&f=s",     *    "Cache-Control": "no-cache",     * ...}</pre>     * It does no further checking or conversion. It does not parse dates.     * It does not do '%' transforms on URLs.     * @throws ParseException     * @param string An HTTP header string.     * @return A JSONObject containing the elements and attributes     * of the XML string.     */    public static JSONObject toJSONObject(String string) throws ParseException {        JSONObject     o = new JSONObject();        HTTPTokener    x = new HTTPTokener(string);        String         t;        t = x.nextToken();        if (t.toUpperCase().startsWith("HTTP")) {// Response            o.put("HTTP-Version", t);            o.put("Status-Code", x.nextToken());            o.put("Reason-Phrase", x.nextTo('\0'));            x.next();        } else {// Request            o.put("Method", t);            o.put("Request-URI", x.nextToken());            o.put("HTTP-Version", x.nextToken());        }// Fields        while (x.more()) {            String name = x.nextTo(':');            x.next(':');            o.put(name, x.nextTo('\0'));            x.next();        }        return o;    }    /**     * Convert a JSONObject into an HTTP header. A request header must contain     * <pre>{     *    Method: "POST" (for example),     *    "Request-URI": "/" (for example),     *    "HTTP-Version": "HTTP/1.1" (for example)     * }</pre>     * A response header must contain     * <pre>{     *    "HTTP-Version": "HTTP/1.1" (for example),     *    "Status-Code": "200" (for example),     *    "Reason-Phrase": "OK" (for example)     * }</pre>     * Any other members of the JSONObject will be output as HTTP fields.     * The result will end with two CRLF pairs.     * @throws NoSuchElementException if the object does not contain enough     *  information.     * @param o A JSONObject     * @return An HTTP header string.     */    public static String toString(JSONObject o) throws NoSuchElementException {        Iterator     keys = o.keys();        String       s;        StringBuffer sb = new StringBuffer();        if (o.has("Status-Code") && o.has("Reason-Phrase")) {            sb.append(o.getString("HTTP-Version"));            sb.append(' ');            sb.append(o.getString("Status-Code"));            sb.append(' ');            sb.append(o.getString("Reason-Phrase"));        } else if (o.has("Method") && o.has("Request-URI")) {            sb.append(o.getString("Method"));            sb.append(' ');            sb.append('"');            sb.append(o.getString("Request-URI"));            sb.append('"');            sb.append(' ');            sb.append(o.getString("HTTP-Version"));        } else {            throw new NoSuchElementException(                                    "Not enough material for an HTTP header.");        }        sb.append(CRLF);        while (keys.hasNext()) {            s = keys.next().toString();            if (!s.equals("HTTP-Version")      && !s.equals("Status-Code") &&                    !s.equals("Reason-Phrase") && !s.equals("Method") &&                    !s.equals("Request-URI")   && !o.isNull(s)) {                sb.append(s);                sb.append(": ");                sb.append(o.getString(s));                sb.append(CRLF);            }        }        sb.append(CRLF);        return sb.toString();    }}