1 /*
2 * Copyright (C) 2010 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32 #include "DOMFilePath.h"
33
34 #if ENABLE(FILE_SYSTEM)
35
36 #include "RegularExpression.h"
37 #include <wtf/Vector.h>
38 #include <wtf/text/CString.h>
39
40 namespace WebCore {
41
42 const char DOMFilePath::separator = '/';
43 const char DOMFilePath::root[] = "/";
44
append(const String & base,const String & components)45 String DOMFilePath::append(const String& base, const String& components)
46 {
47 return ensureDirectoryPath(base) + components;
48 }
49
ensureDirectoryPath(const String & path)50 String DOMFilePath::ensureDirectoryPath(const String& path)
51 {
52 if (!DOMFilePath::endsWithSeparator(path)) {
53 String newPath = path;
54 newPath.append(DOMFilePath::separator);
55 return newPath;
56 }
57 return path;
58 }
59
getName(const String & path)60 String DOMFilePath::getName(const String& path)
61 {
62 int index = path.reverseFind(DOMFilePath::separator);
63 if (index != -1)
64 return path.substring(index + 1);
65 return path;
66 }
67
getDirectory(const String & path)68 String DOMFilePath::getDirectory(const String& path)
69 {
70 int index = path.reverseFind(DOMFilePath::separator);
71 if (index == 0)
72 return DOMFilePath::root;
73 if (index != -1)
74 return path.substring(0, index);
75 return ".";
76 }
77
isParentOf(const String & parent,const String & mayBeChild)78 bool DOMFilePath::isParentOf(const String& parent, const String& mayBeChild)
79 {
80 ASSERT(DOMFilePath::isAbsolute(parent));
81 ASSERT(DOMFilePath::isAbsolute(mayBeChild));
82 if (parent == DOMFilePath::root && mayBeChild != DOMFilePath::root)
83 return true;
84 if (parent.length() >= mayBeChild.length() || !mayBeChild.startsWith(parent, false))
85 return false;
86 if (mayBeChild[parent.length()] != DOMFilePath::separator)
87 return false;
88 return true;
89 }
90
removeExtraParentReferences(const String & path)91 String DOMFilePath::removeExtraParentReferences(const String& path)
92 {
93 ASSERT(DOMFilePath::isAbsolute(path));
94 Vector<String> components;
95 Vector<String> canonicalized;
96 path.split(DOMFilePath::separator, components);
97 for (size_t i = 0; i < components.size(); ++i) {
98 if (components[i] == ".")
99 continue;
100 if (components[i] == "..") {
101 if (canonicalized.size() > 0)
102 canonicalized.removeLast();
103 continue;
104 }
105 canonicalized.append(components[i]);
106 }
107 if (canonicalized.isEmpty())
108 return DOMFilePath::root;
109 String result;
110 for (size_t i = 0; i < canonicalized.size(); ++i) {
111 result.append(DOMFilePath::separator);
112 result.append(canonicalized[i]);
113 }
114 return result;
115 }
116
117 // Check the naming restrictions defined in FileSystem API 8.3.
118 // http://dev.w3.org/2009/dap/file-system/file-dir-sys.html#naming-restrictions
isValidPath(const String & path)119 bool DOMFilePath::isValidPath(const String& path)
120 {
121 if (path.isEmpty() || path == DOMFilePath::root)
122 return true;
123
124 // Chars 0-31 in UTF-8 prepresentation are not allowed.
125 for (size_t i = 0; i < path.length(); ++i)
126 if (path[i] < 32)
127 return false;
128
129 // Unallowed names.
130 DEFINE_STATIC_LOCAL(RegularExpression, unallowedNamesRegExp1, ("(/|^)(CON|PRN|AUX|NUL)([\\./]|$)", TextCaseInsensitive));
131 DEFINE_STATIC_LOCAL(RegularExpression, unallowedNamesRegExp2, ("(/|^)(COM|LPT)[1-9]([\\./]|$)", TextCaseInsensitive));
132
133 if (unallowedNamesRegExp1.match(path) >= 0)
134 return false;
135 if (unallowedNamesRegExp2.match(path) >= 0)
136 return false;
137
138 // Names must not end with period or whitespace.
139 DEFINE_STATIC_LOCAL(RegularExpression, endingRegExp, ("[\\.\\s](/|$)", TextCaseInsensitive));
140
141 if (endingRegExp.match(path) >= 0)
142 return false;
143
144 // Unallowed chars: '\', '<', '>', ':', '?', '*', '"', '|'
145 // (We don't check '/' here as this method takes paths as its argument.)
146 DEFINE_STATIC_LOCAL(RegularExpression, unallowedCharsRegExp, ("[\\\\<>:\\?\\*\"|]", TextCaseInsensitive));
147
148 if (unallowedCharsRegExp.match(path) >= 0)
149 return false;
150
151 return true;
152 }
153
isValidName(const String & name)154 bool DOMFilePath::isValidName(const String& name)
155 {
156 if (name.isEmpty())
157 return true;
158 // '/' is not allowed in name.
159 if (name.contains('/'))
160 return false;
161 return isValidPath(name);
162 }
163
164 } // namespace WebCore
165
166 #endif // ENABLE(FILE_SYSTEM)
167