1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/**
* Copyright 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import("comet");
import("ejs");
import("etherpad.collab.ace.easysync2.{AttribPool,Changeset}");
import("etherpad.log");
import("etherpad.pad.activepads");
import("etherpad.pad.model");
import("etherpad.pad.padutils");
import("etherpad.pad.padevents");
import("etherpad.pro.pro_padmeta");
import("fastJSON");
import("fileutils.readFile");
import("jsutils.eachProperty");
jimport("java.util.Random");
jimport("java.lang.System");
import("etherpad.collab.collab_server");
// importClass(java.util.Random);
// importClass(java.lang.System);
var _serverDebug = function() {};
var _dmesg = function() { System.out.println(arguments[0]+""); };
/// Begin readonly/padId conversion code
/// TODO: refactor into new file?
var _baseRandomNumber = 0x123123; // keep this number seekrit
function _map(array, func) {
for(var i=0; i<array.length; i++) {
array[i] = func(array[i]);
}
return array;
}
function parseUrlId(readOnlyIdOrLocalPadId) {
var localPadId;
var viewId;
var isReadOnly;
var roPadId;
var globalPadId;
if(isReadOnlyId(readOnlyIdOrLocalPadId)) {
isReadOnly = true;
globalPadId = readonlyToPadId(readOnlyIdOrLocalPadId);
localPadId = padutils.globalToLocalId(globalPadId);
var globalPadIdCheck = padutils.getGlobalPadId(localPadId);
if (globalPadId != globalPadIdCheck) {
// domain doesn't match
response.forbid();
}
roPadId = readOnlyIdOrLocalPadId;
viewId = roPadId;
}
else {
isReadOnly = false;
localPadId = readOnlyIdOrLocalPadId;
globalPadId = padutils.getGlobalPadId(localPadId);
viewId = globalPadId;
roPadId = padIdToReadonly(globalPadId);
}
return {localPadId:localPadId, viewId:viewId, isReadOnly:isReadOnly,
roPadId:roPadId, globalPadId:globalPadId};
}
function isReadOnlyId(str) {
return str.indexOf("ro.") == 0;
}
/*
for now, we just make it 'hard to guess'
TODO: make it impossible to find read/write page through hash
*/
function readonlyToPadId (readOnlyHash) {
// readOnly hashes must start with 'ro-'
if(!isReadOnlyId(readOnlyHash)) return null;
else {
readOnlyHash = readOnlyHash.substring(3, readOnlyHash.length);
}
// convert string to series of numbers between 1 and 64
var result = _strToArray(readOnlyHash);
var sum = result.pop();
// using a secret seed to util.random, transform each number using + and %
var seed = _baseRandomNumber + sum;
var rand = new Random(seed);
_map(result, function(elem) {
return ((64 + elem - rand.nextInt(64)) % 64);
});
// convert array of numbers back to a string
return _arrayToStr(result);
}
/*
Temporary code. see comment at readonlyToPadId.
*/
function padIdToReadonly (padid) {
var result = _strToArray(padid);
var sum = 0;
if(padid.length > 1) {
for(var i=0; i<result.length; i++) {
sum = (sum + result[i] + 1) % 64;
}
} else {
sum = 64;
}
var seed = _baseRandomNumber + sum;
var rand = new Random(seed);
_map(result, function(elem) {
var randnum = rand.nextInt(64);
return ((elem + randnum) % 64);
});
result.push(sum);
return "ro." + _arrayToStr(result);
}
// little reversable string encoding function
// 0-9 are the numbers 0-9
// 10-35 are the uppercase letters A-Z
// 36-61 are the lowercase letters a-z
// 62 are all other characters
function _strToArray(str) {
var result = new Array(str.length);
for(var i=0; i<str.length; i++) {
result[i] = str.charCodeAt(i);
if (_between(result[i], '0'.charCodeAt(0), '9'.charCodeAt(0))) {
result[i] -= '0'.charCodeAt(0);
}
else if(_between(result[i], 'A'.charCodeAt(0), 'Z'.charCodeAt(0))) {
result[i] -= 'A'.charCodeAt(0); // A becomes 0
result[i] += 10; // A becomes 10
}
else if(_between(result[i], 'a'.charCodeAt(0), 'z'.charCodeAt(0))) {
result[i] -= 'a'.charCodeAt(0); // a becomes 0
result[i] += 36; // a becomes 36
} else if(result[i] == '$'.charCodeAt(0)) {
result[i] = 62;
} else {
result[i] = 63; // if not alphanumeric or $, we default to 63
}
}
return result;
}
function _arrayToStr(array) {
var result = "";
for(var i=0; i<array.length; i++) {
if(_between(array[i], 0, 9)) {
result += String.fromCharCode(array[i] + '0'.charCodeAt(0));
}
else if(_between(array[i], 10, 35)) {
result += String.fromCharCode(array[i] - 10 + 'A'.charCodeAt(0));
}
else if(_between(array[i], 36, 61)) {
result += String.fromCharCode(array[i] - 36 + 'a'.charCodeAt(0));
}
else if(array[i] == 62) {
result += "$";
} else {
result += "-";
}
}
return result;
}
function _between(charcode, start, end) {
return charcode >= start && charcode <= end;
}
/* a short little testing function, converts back and forth */
// function _testEncrypt(str) {
// var encrypted = padIdToReadonly(str);
// var decrypted = readonlyToPadId(encrypted);
// _dmesg(str + " " + encrypted + " " + decrypted);
// if(decrypted != str) {
// _dmesg("ERROR: " + str + " and " + decrypted + " do not match");
// }
// }
// _testEncrypt("testing$");
|
