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
|
/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* Test for bug 484579 <https://bugzilla.mozilla.org/show_bug.cgi?id=484579>:
* nsIMIMEService.getTypeFromExtension may fail unexpectedly on Windows when
* "Content Type" is empty in the registry.
*/
function run_test() {
// --- Preliminary platform check ---
// If this test is not running on the Windows platform, stop now, before
// calling XPCOMUtils.generateQI during the MockWindowsRegKey declaration.
if (mozinfo.os != "win")
return;
// --- Modified nsIWindowsRegKey implementation ---
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
/**
* Constructs a new mock registry key by wrapping the provided object.
*
* This mock implementation is tailored for this test, and forces consumers
* of the readStringValue method to believe that the "Content Type" value of
* the ".txt" key under HKEY_CLASSES_ROOT is an empty string.
*
* The same value read from "HKEY_LOCAL_MACHINE\SOFTWARE\Classes" is not
* affected.
*
* @param aWrappedObject An actual nsIWindowsRegKey implementation.
*/
function MockWindowsRegKey(aWrappedObject) {
this._wrappedObject = aWrappedObject;
// This function creates a forwarding function for wrappedObject
function makeForwardingFunction(functionName) {
return function() {
return aWrappedObject[functionName].apply(aWrappedObject, arguments);
}
}
// Forward all the functions that are not explicitly overridden
for (var propertyName in aWrappedObject) {
if (!(propertyName in this)) {
if (typeof aWrappedObject[propertyName] == "function") {
this[propertyName] = makeForwardingFunction(propertyName);
} else {
this[propertyName] = aWrappedObject[propertyName];
}
}
}
}
MockWindowsRegKey.prototype = {
// --- Overridden nsISupports interface functions ---
QueryInterface: XPCOMUtils.generateQI([Ci.nsIWindowsRegKey]),
// --- Overridden nsIWindowsRegKey interface functions ---
open: function(aRootKey, aRelPath, aMode) {
// Remember the provided root key and path
this._rootKey = aRootKey;
this._relPath = aRelPath;
// Create the actual registry key
return this._wrappedObject.open(aRootKey, aRelPath, aMode);
},
openChild: function(aRelPath, aMode) {
// Open the child key and wrap it
var innerKey = this._wrappedObject.openChild(aRelPath, aMode);
var key = new MockWindowsRegKey(innerKey);
// Set the properties of the child key and return it
key._rootKey = this._rootKey;
key._relPath = this._relPath + aRelPath;
return key;
},
createChild: function(aRelPath, aMode) {
// Create the child key and wrap it
var innerKey = this._wrappedObject.createChild(aRelPath, aMode);
var key = new MockWindowsRegKey(innerKey);
// Set the properties of the child key and return it
key._rootKey = this._rootKey;
key._relPath = this._relPath + aRelPath;
return key;
},
get childCount() {
return this._wrappedObject.childCount;
},
get valueCount() {
return this._wrappedObject.valueCount;
},
readStringValue: function(aName) {
// If this is the key under test, return a fake value
if (this._rootKey == Ci.nsIWindowsRegKey.ROOT_KEY_CLASSES_ROOT &&
this._relPath.toLowerCase() == ".txt" &&
aName.toLowerCase() == "content type") {
return "";
}
// Return the real value in the registry
return this._wrappedObject.readStringValue(aName);
}
};
// --- Mock nsIWindowsRegKey factory ---
var componentRegistrar = Components.manager.
QueryInterface(Ci.nsIComponentRegistrar);
var originalWindowsRegKeyCID;
var mockWindowsRegKeyFactory;
const kMockCID = Components.ID("{9b23dfe9-296b-4740-ba1c-d39c9a16e55e}");
const kWindowsRegKeyContractID = "@mozilla.org/windows-registry-key;1";
const kWindowsRegKeyClassName = "nsWindowsRegKey";
function registerMockWindowsRegKeyFactory() {
mockWindowsRegKeyFactory = {
createInstance: function(aOuter, aIid) {
if (aOuter != null)
throw Cr.NS_ERROR_NO_AGGREGATION;
var innerKey = originalWindowsRegKeyFactory.createInstance(null, aIid);
var key = new MockWindowsRegKey(innerKey);
return key.QueryInterface(aIid);
}
};
// Preserve the original factory
originalWindowsRegKeyCID = Cc[kWindowsRegKeyContractID].number;
// Register the mock factory
componentRegistrar.registerFactory(
kMockCID,
"Mock Windows Registry Key Implementation",
kWindowsRegKeyContractID,
mockWindowsRegKeyFactory
);
}
function unregisterMockWindowsRegKeyFactory() {
// Free references to the mock factory
componentRegistrar.unregisterFactory(
kMockCID,
mockWindowsRegKeyFactory
);
// Restore the original factory
componentRegistrar.registerFactory(
Components.ID(originalWindowsRegKeyCID),
"",
kWindowsRegKeyContractID,
null
);
}
// --- Test procedure ---
// Activate the override of the ".txt" file association data in the registry
registerMockWindowsRegKeyFactory();
try {
// Try and get the MIME type associated with the extension. If this
// operation does not throw an unexpected exception, the test succeeds.
var type = Cc["@mozilla.org/mime;1"].
getService(Ci.nsIMIMEService).
getTypeFromExtension(".txt");
} catch (e if (e instanceof Ci.nsIException &&
e.result == Cr.NS_ERROR_NOT_AVAILABLE)) {
// This is an expected exception, thrown if the type can't be determined
} finally {
// Ensure we restore the original factory when the test is finished
unregisterMockWindowsRegKeyFactory();
}
}
|
