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package org.activiti.engine.impl.util.json;

/*
 Copyright (c) 2002 JSON.org

 Permission 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;

/**
 * Convert an HTTP header to a JSONObject and back.
 * 

 * @version 2008-09-18
 */
public class 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
   * 
   *    * {
   *    Method: "POST" (for example),
   *    "Request-URI": "/" (for example),
   *    "HTTP-Version": "HTTP/1.1" (for example)
   * }
   * 
   * 
   * A response header will contain
   * 
   *    * {
   *    "HTTP-Version": "HTTP/1.1" (for example),
   *    "Status-Code": "200" (for example),
   *    "Reason-Phrase": "OK" (for example)
   * }
   * 
   * 
   * In addition, the other parameters in the header will be captured, using the HTTP field names as JSON names, so that
   * 
   *    *    Date: Sun, 26 May 2002 18:06:04 GMT
   *    Cookie: Q=q2=PPEAsg--; B=677gi6ouf29bn&b=2&f=s
   *    Cache-Control: no-cache
   * 
   * 
   * become
   * 
   *    * {...
   *    Date: "Sun, 26 May 2002 18:06:04 GMT",
   *    Cookie: "Q=q2=PPEAsg--; B=677gi6ouf29bn&b=2&f=s",
   *    "Cache-Control": "no-cache",
   * ...}
   * 
   * 
   * It does no further checking or conversion. It does not parse dates. It does not do '%' transforms on URLs.
   * 
   * @param string
   *          An HTTP header string.
   * @return A JSONObject containing the elements and attributes of the XML string.
   * @throws JSONException
   */
  public static JSONObject toJSONObject(String string) throws JSONException {
    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
   * 
   *    * {
   *    Method: "POST" (for example),
   *    "Request-URI": "/" (for example),
   *    "HTTP-Version": "HTTP/1.1" (for example)
   * }
   * 
   * 
   * A response header must contain
   * 
   *    * {
   *    "HTTP-Version": "HTTP/1.1" (for example),
   *    "Status-Code": "200" (for example),
   *    "Reason-Phrase": "OK" (for example)
   * }
   * 
   * 
   * Any other members of the JSONObject will be output as HTTP fields. The result will end with two CRLF pairs.
   * 
   * @param o
   *          A JSONObject
   * @return An HTTP header string.
   * @throws JSONException
   *           if the object does not contain enough information.
   */
  @SuppressWarnings("unchecked")
  public static String toString(JSONObject o) throws JSONException {
    Iterator keys = o.keys();
    String s;
    StringBuilder sb = new StringBuilder();
    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 JSONException("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();
  }
}