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HTTP.java

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package org.json;

/*

Public Domain.

*/

import java.util.Locale;

/**

* Convert an HTTP header to a JSONObject and back.

* @author JSON.org

* @version 2015-12-09

*/

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

* <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>{@code

* 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>{@code

* 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.

* @param string An HTTP header string.

* @return A JSONObject containing the elements and attributes

* of the XML string.

* @throws JSONException if a called function fails

*/

public static JSONObject toJSONObject(String string) throws JSONException {

JSONObject jo = new JSONObject();

HTTPTokener x = new HTTPTokener(string);

String token;

token = x.nextToken();

if (token.toUpperCase(Locale.ROOT).startsWith("HTTP")) {

// Response

jo.put("HTTP-Version", token);

jo.put("Status-Code", x.nextToken());

jo.put("Reason-Phrase", x.nextTo('\0'));

x.next();

} else {

// Request

jo.put("Method", token);

jo.put("Request-URI", x.nextToken());

jo.put("HTTP-Version", x.nextToken());

}

// Fields

while (x.more()) {

String name = x.nextTo(':');

x.next(':');

jo.put(name, x.nextTo('\0'));

x.next();

}

return jo;

}

/**

* 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.

* @param jo A JSONObject

* @return An HTTP header string.

* @throws JSONException if the object does not contain enough

* information.

*/

public static String toString(JSONObject jo) throws JSONException {

StringBuilder sb = new StringBuilder();

if (jo.has("Status-Code") && jo.has("Reason-Phrase")) {

sb.append(jo.getString("HTTP-Version"));

sb.append(' ');

sb.append(jo.getString("Status-Code"));

sb.append(' ');

sb.append(jo.getString("Reason-Phrase"));

} else if (jo.has("Method") && jo.has("Request-URI")) {

sb.append(jo.getString("Method"));

sb.append(' ');

sb.append('"');

sb.append(jo.getString("Request-URI"));

sb.append('"');

sb.append(' ');

sb.append(jo.getString("HTTP-Version"));

} else {

throw new JSONException("Not enough material for an HTTP header.");

}

sb.append(CRLF);

// Don't use the new entrySet API to maintain Android support

for (final String key : jo.keySet()) {

String value = jo.optString(key);

if (!"HTTP-Version".equals(key) && !"Status-Code".equals(key) &&

!"Reason-Phrase".equals(key) && !"Method".equals(key) &&

!"Request-URI".equals(key) && !JSONObject.NULL.equals(value)) {

sb.append(key);

sb.append(": ");

sb.append(jo.optString(key));

sb.append(CRLF);

}

}

sb.append(CRLF);

return sb.toString();

}

}