1 package com.google.polo.json; 2 3 /* 4 Copyright (c) 2002 JSON.org 5 6 Permission is hereby granted, free of charge, to any person obtaining a copy 7 of this software and associated documentation files (the "Software"), to deal 8 in the Software without restriction, including without limitation the rights 9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 copies of the Software, and to permit persons to whom the Software is 11 furnished to do so, subject to the following conditions: 12 13 The above copyright notice and this permission notice shall be included in all 14 copies or substantial portions of the Software. 15 16 The Software shall be used for Good, not Evil. 17 18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 21 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 23 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 24 SOFTWARE. 25 */ 26 27 /** 28 * Convert a web browser cookie specification to a JSONObject and back. 29 * JSON and Cookies are both notations for name/value pairs. 30 * @author JSON.org 31 * @version 2008-09-18 32 */ 33 public class Cookie { 34 35 /** 36 * Produce a copy of a string in which the characters '+', '%', '=', ';' 37 * and control characters are replaced with "%hh". This is a gentle form 38 * of URL encoding, attempting to cause as little distortion to the 39 * string as possible. The characters '=' and ';' are meta characters in 40 * cookies. By convention, they are escaped using the URL-encoding. This is 41 * only a convention, not a standard. Often, cookies are expected to have 42 * encoded values. We encode '=' and ';' because we must. We encode '%' and 43 * '+' because they are meta characters in URL encoding. 44 * @param string The source string. 45 * @return The escaped result. 46 */ 47 public static String escape(String string) { 48 char c; 49 String s = string.trim(); 50 StringBuffer sb = new StringBuffer(); 51 int len = s.length(); 52 for (int i = 0; i < len; i += 1) { 53 c = s.charAt(i); 54 if (c < ' ' || c == '+' || c == '%' || c == '=' || c == ';') { 55 sb.append('%'); 56 sb.append(Character.forDigit((char)((c >>> 4) & 0x0f), 16)); 57 sb.append(Character.forDigit((char)(c & 0x0f), 16)); 58 } else { 59 sb.append(c); 60 } 61 } 62 return sb.toString(); 63 } 64 65 66 /** 67 * Convert a cookie specification string into a JSONObject. The string 68 * will contain a name value pair separated by '='. The name and the value 69 * will be unescaped, possibly converting '+' and '%' sequences. The 70 * cookie properties may follow, separated by ';', also represented as 71 * name=value (except the secure property, which does not have a value). 72 * The name will be stored under the key "name", and the value will be 73 * stored under the key "value". This method does not do checking or 74 * validation of the parameters. It only converts the cookie string into 75 * a JSONObject. 76 * @param string The cookie specification string. 77 * @return A JSONObject containing "name", "value", and possibly other 78 * members. 79 * @throws JSONException 80 */ 81 public static JSONObject toJSONObject(String string) throws JSONException { 82 String n; 83 JSONObject o = new JSONObject(); 84 Object v; 85 JSONTokener x = new JSONTokener(string); 86 o.put("name", x.nextTo('=')); 87 x.next('='); 88 o.put("value", x.nextTo(';')); 89 x.next(); 90 while (x.more()) { 91 n = unescape(x.nextTo("=;")); 92 if (x.next() != '=') { 93 if (n.equals("secure")) { 94 v = Boolean.TRUE; 95 } else { 96 throw x.syntaxError("Missing '=' in cookie parameter."); 97 } 98 } else { 99 v = unescape(x.nextTo(';')); 100 x.next(); 101 } 102 o.put(n, v); 103 } 104 return o; 105 } 106 107 108 /** 109 * Convert a JSONObject into a cookie specification string. The JSONObject 110 * must contain "name" and "value" members. 111 * If the JSONObject contains "expires", "domain", "path", or "secure" 112 * members, they will be appended to the cookie specification string. 113 * All other members are ignored. 114 * @param o A JSONObject 115 * @return A cookie specification string 116 * @throws JSONException 117 */ 118 public static String toString(JSONObject o) throws JSONException { 119 StringBuffer sb = new StringBuffer(); 120 121 sb.append(escape(o.getString("name"))); 122 sb.append("="); 123 sb.append(escape(o.getString("value"))); 124 if (o.has("expires")) { 125 sb.append(";expires="); 126 sb.append(o.getString("expires")); 127 } 128 if (o.has("domain")) { 129 sb.append(";domain="); 130 sb.append(escape(o.getString("domain"))); 131 } 132 if (o.has("path")) { 133 sb.append(";path="); 134 sb.append(escape(o.getString("path"))); 135 } 136 if (o.optBoolean("secure")) { 137 sb.append(";secure"); 138 } 139 return sb.toString(); 140 } 141 142 /** 143 * Convert <code>%</code><i>hh</i> sequences to single characters, and 144 * convert plus to space. 145 * @param s A string that may contain 146 * <code>+</code> <small>(plus)</small> and 147 * <code>%</code><i>hh</i> sequences. 148 * @return The unescaped string. 149 */ 150 public static String unescape(String s) { 151 int len = s.length(); 152 StringBuffer b = new StringBuffer(); 153 for (int i = 0; i < len; ++i) { 154 char c = s.charAt(i); 155 if (c == '+') { 156 c = ' '; 157 } else if (c == '%' && i + 2 < len) { 158 int d = JSONTokener.dehexchar(s.charAt(i + 1)); 159 int e = JSONTokener.dehexchar(s.charAt(i + 2)); 160 if (d >= 0 && e >= 0) { 161 c = (char)(d * 16 + e); 162 i += 2; 163 } 164 } 165 b.append(c); 166 } 167 return b.toString(); 168 } 169 } 170
