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Side by Side Diff: webkit/browser/database/database_util.cc

Issue 539143002: Migrate webkit/browser/ to storage/browser/ (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: fix android build Created 6 years, 3 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "webkit/browser/database/database_util.h"
6
7 #include "base/basictypes.h"
8 #include "base/strings/utf_string_conversions.h"
9 #include "webkit/browser/database/database_tracker.h"
10 #include "webkit/browser/database/vfs_backend.h"
11 #include "webkit/common/database/database_identifier.h"
12
13 namespace storage {
14
15 namespace {
16
17 bool IsSafeSuffix(const base::string16& suffix) {
18 base::char16 prev_c = 0;
19 for (base::string16::const_iterator it = suffix.begin();
20 it < suffix.end(); ++it) {
21 base::char16 c = *it;
22 if (!(IsAsciiAlpha(c) || IsAsciiDigit(c) ||
23 c == '-' || c == '.' || c == '_')) {
24 return false;
25 }
26 if (c == '.' && prev_c == '.')
27 return false;
28 prev_c = c;
29 }
30 return true;
31 }
32
33 }
34
35 const char DatabaseUtil::kJournalFileSuffix[] = "-journal";
36
37 bool DatabaseUtil::CrackVfsFileName(const base::string16& vfs_file_name,
38 std::string* origin_identifier,
39 base::string16* database_name,
40 base::string16* sqlite_suffix) {
41 // 'vfs_file_name' is of the form <origin_identifier>/<db_name>#<suffix>.
42 // <suffix> is optional.
43 DCHECK(!vfs_file_name.empty());
44 size_t first_slash_index = vfs_file_name.find('/');
45 size_t last_pound_index = vfs_file_name.rfind('#');
46 // '/' and '#' must be present in the string. Also, the string cannot start
47 // with a '/' (origin_identifier cannot be empty) and '/' must come before '#'
48 if ((first_slash_index == base::string16::npos) ||
49 (last_pound_index == base::string16::npos) ||
50 (first_slash_index == 0) ||
51 (first_slash_index > last_pound_index)) {
52 return false;
53 }
54
55 std::string origin_id = base::UTF16ToASCII(
56 vfs_file_name.substr(0, first_slash_index));
57 if (!IsValidOriginIdentifier(origin_id))
58 return false;
59
60 base::string16 suffix = vfs_file_name.substr(
61 last_pound_index + 1, vfs_file_name.length() - last_pound_index - 1);
62 if (!IsSafeSuffix(suffix))
63 return false;
64
65 if (origin_identifier)
66 *origin_identifier = origin_id;
67
68 if (database_name) {
69 *database_name = vfs_file_name.substr(
70 first_slash_index + 1, last_pound_index - first_slash_index - 1);
71 }
72
73 if (sqlite_suffix)
74 *sqlite_suffix = suffix;
75
76 return true;
77 }
78
79 base::FilePath DatabaseUtil::GetFullFilePathForVfsFile(
80 DatabaseTracker* db_tracker, const base::string16& vfs_file_name) {
81 std::string origin_identifier;
82 base::string16 database_name;
83 base::string16 sqlite_suffix;
84 if (!CrackVfsFileName(vfs_file_name, &origin_identifier,
85 &database_name, &sqlite_suffix)) {
86 return base::FilePath(); // invalid vfs_file_name
87 }
88
89 base::FilePath full_path = db_tracker->GetFullDBFilePath(
90 origin_identifier, database_name);
91 if (!full_path.empty() && !sqlite_suffix.empty()) {
92 DCHECK(full_path.Extension().empty());
93 full_path = full_path.InsertBeforeExtensionASCII(
94 base::UTF16ToASCII(sqlite_suffix));
95 }
96 // Watch out for directory traversal attempts from a compromised renderer.
97 if (full_path.value().find(FILE_PATH_LITERAL("..")) !=
98 base::FilePath::StringType::npos)
99 return base::FilePath();
100 return full_path;
101 }
102
103 bool DatabaseUtil::IsValidOriginIdentifier(
104 const std::string& origin_identifier) {
105 return GetOriginFromIdentifier(origin_identifier).is_valid();
106 }
107
108 } // namespace storage
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