1 // Copyright 2013 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.
5 #include "extensions/common/file_util.h"
13 #include "base/file_util.h"
14 #include "base/files/file_enumerator.h"
15 #include "base/files/file_path.h"
16 #include "base/files/scoped_temp_dir.h"
17 #include "base/json/json_file_value_serializer.h"
18 #include "base/logging.h"
19 #include "base/memory/scoped_ptr.h"
20 #include "base/strings/stringprintf.h"
21 #include "base/strings/utf_string_conversions.h"
22 #include "base/threading/thread_restrictions.h"
23 #include "extensions/common/constants.h"
24 #include "extensions/common/extension.h"
25 #include "extensions/common/extension_icon_set.h"
26 #include "extensions/common/extension_l10n_util.h"
27 #include "extensions/common/install_warning.h"
28 #include "extensions/common/manifest.h"
29 #include "extensions/common/manifest_constants.h"
30 #include "extensions/common/manifest_handler.h"
31 #include "extensions/common/manifest_handlers/icons_handler.h"
32 #include "extensions/common/message_bundle.h"
33 #include "grit/extensions_strings.h"
34 #include "net/base/escape.h"
35 #include "ui/base/l10n/l10n_util.h"
38 namespace extensions
{
42 // Returns true if the given file path exists and is not zero-length.
43 bool ValidateFilePath(const base::FilePath
& path
) {
45 if (!base::PathExists(path
) ||
46 !base::GetFileSize(path
, &size
) ||
56 const base::FilePath::CharType kTempDirectoryName
[] = FILE_PATH_LITERAL("Temp");
58 base::FilePath
InstallExtension(const base::FilePath
& unpacked_source_dir
,
59 const std::string
& id
,
60 const std::string
& version
,
61 const base::FilePath
& extensions_dir
) {
62 base::FilePath extension_dir
= extensions_dir
.AppendASCII(id
);
63 base::FilePath version_dir
;
65 // Create the extension directory if it doesn't exist already.
66 if (!base::PathExists(extension_dir
)) {
67 if (!base::CreateDirectory(extension_dir
))
68 return base::FilePath();
71 // Get a temp directory on the same file system as the profile.
72 base::FilePath install_temp_dir
= GetInstallTempDir(extensions_dir
);
73 base::ScopedTempDir extension_temp_dir
;
74 if (install_temp_dir
.empty() ||
75 !extension_temp_dir
.CreateUniqueTempDirUnderPath(install_temp_dir
)) {
76 LOG(ERROR
) << "Creating of temp dir under in the profile failed.";
77 return base::FilePath();
79 base::FilePath crx_temp_source
=
80 extension_temp_dir
.path().Append(unpacked_source_dir
.BaseName());
81 if (!base::Move(unpacked_source_dir
, crx_temp_source
)) {
82 LOG(ERROR
) << "Moving extension from : " << unpacked_source_dir
.value()
83 << " to : " << crx_temp_source
.value() << " failed.";
84 return base::FilePath();
87 // Try to find a free directory. There can be legitimate conflicts in the case
88 // of overinstallation of the same version.
89 const int kMaxAttempts
= 100;
90 for (int i
= 0; i
< kMaxAttempts
; ++i
) {
91 base::FilePath candidate
= extension_dir
.AppendASCII(
92 base::StringPrintf("%s_%u", version
.c_str(), i
));
93 if (!base::PathExists(candidate
)) {
94 version_dir
= candidate
;
99 if (version_dir
.empty()) {
100 LOG(ERROR
) << "Could not find a home for extension " << id
<< " with "
101 << "version " << version
<< ".";
102 return base::FilePath();
105 if (!base::Move(crx_temp_source
, version_dir
)) {
106 LOG(ERROR
) << "Installing extension from : " << crx_temp_source
.value()
107 << " into : " << version_dir
.value() << " failed.";
108 return base::FilePath();
114 void UninstallExtension(const base::FilePath
& extensions_dir
,
115 const std::string
& id
) {
116 // We don't care about the return value. If this fails (and it can, due to
117 // plugins that aren't unloaded yet), it will get cleaned up by
118 // ExtensionGarbageCollector::GarbageCollectExtensions.
119 base::DeleteFile(extensions_dir
.AppendASCII(id
), true); // recursive.
122 scoped_refptr
<Extension
> LoadExtension(const base::FilePath
& extension_path
,
123 Manifest::Location location
,
125 std::string
* error
) {
126 return LoadExtension(extension_path
, std::string(), location
, flags
, error
);
129 scoped_refptr
<Extension
> LoadExtension(const base::FilePath
& extension_path
,
130 const std::string
& extension_id
,
131 Manifest::Location location
,
133 std::string
* error
) {
134 scoped_ptr
<base::DictionaryValue
> manifest(
135 LoadManifest(extension_path
, error
));
138 if (!extension_l10n_util::LocalizeExtension(
139 extension_path
, manifest
.get(), error
)) {
143 scoped_refptr
<Extension
> extension(Extension::Create(
144 extension_path
, location
, *manifest
, flags
, extension_id
, error
));
145 if (!extension
.get())
148 std::vector
<InstallWarning
> warnings
;
149 if (!ValidateExtension(extension
.get(), error
, &warnings
))
151 extension
->AddInstallWarnings(warnings
);
156 base::DictionaryValue
* LoadManifest(const base::FilePath
& extension_path
,
157 std::string
* error
) {
158 return LoadManifest(extension_path
, kManifestFilename
, error
);
161 base::DictionaryValue
* LoadManifest(
162 const base::FilePath
& extension_path
,
163 const base::FilePath::CharType
* manifest_filename
,
164 std::string
* error
) {
165 base::FilePath manifest_path
= extension_path
.Append(manifest_filename
);
166 if (!base::PathExists(manifest_path
)) {
167 *error
= l10n_util::GetStringUTF8(IDS_EXTENSION_MANIFEST_UNREADABLE
);
171 JSONFileValueSerializer
serializer(manifest_path
);
172 scoped_ptr
<base::Value
> root(serializer
.Deserialize(NULL
, error
));
174 if (error
->empty()) {
175 // If |error| is empty, than the file could not be read.
176 // It would be cleaner to have the JSON reader give a specific error
177 // in this case, but other code tests for a file error with
178 // error->empty(). For now, be consistent.
179 *error
= l10n_util::GetStringUTF8(IDS_EXTENSION_MANIFEST_UNREADABLE
);
181 *error
= base::StringPrintf(
182 "%s %s", manifest_errors::kManifestParseError
, error
->c_str());
187 if (!root
->IsType(base::Value::TYPE_DICTIONARY
)) {
188 *error
= l10n_util::GetStringUTF8(IDS_EXTENSION_MANIFEST_INVALID
);
192 return static_cast<base::DictionaryValue
*>(root
.release());
195 bool ValidateExtension(const Extension
* extension
,
197 std::vector
<InstallWarning
>* warnings
) {
198 // Ask registered manifest handlers to validate their paths.
199 if (!ManifestHandler::ValidateExtension(extension
, error
, warnings
))
202 // Check children of extension root to see if any of them start with _ and is
203 // not on the reserved list. We only warn, and do not block the loading of the
206 if (!CheckForIllegalFilenames(extension
->path(), &warning
))
207 warnings
->push_back(InstallWarning(warning
));
209 // Check that extensions don't include private key files.
210 std::vector
<base::FilePath
> private_keys
=
211 FindPrivateKeyFiles(extension
->path());
212 if (extension
->creation_flags() & Extension::ERROR_ON_PRIVATE_KEY
) {
213 if (!private_keys
.empty()) {
214 // Only print one of the private keys because l10n_util doesn't have a way
215 // to translate a list of strings.
217 l10n_util::GetStringFUTF8(IDS_EXTENSION_CONTAINS_PRIVATE_KEY
,
218 private_keys
.front().LossyDisplayName());
222 for (size_t i
= 0; i
< private_keys
.size(); ++i
) {
223 warnings
->push_back(InstallWarning(
224 l10n_util::GetStringFUTF8(IDS_EXTENSION_CONTAINS_PRIVATE_KEY
,
225 private_keys
[i
].LossyDisplayName())));
227 // Only warn; don't block loading the extension.
232 std::vector
<base::FilePath
> FindPrivateKeyFiles(
233 const base::FilePath
& extension_dir
) {
234 std::vector
<base::FilePath
> result
;
235 // Pattern matching only works at the root level, so filter manually.
236 base::FileEnumerator
traversal(
237 extension_dir
, /*recursive=*/true, base::FileEnumerator::FILES
);
238 for (base::FilePath current
= traversal
.Next(); !current
.empty();
239 current
= traversal
.Next()) {
240 if (!current
.MatchesExtension(kExtensionKeyFileExtension
))
243 std::string key_contents
;
244 if (!base::ReadFileToString(current
, &key_contents
)) {
245 // If we can't read the file, assume it's not a private key.
248 std::string key_bytes
;
249 if (!Extension::ParsePEMKeyBytes(key_contents
, &key_bytes
)) {
250 // If we can't parse the key, assume it's ok too.
254 result
.push_back(current
);
259 bool CheckForIllegalFilenames(const base::FilePath
& extension_path
,
260 std::string
* error
) {
261 // Reserved underscore names.
262 static const base::FilePath::CharType
* reserved_names
[] = {
263 kLocaleFolder
, kPlatformSpecificFolder
, FILE_PATH_LITERAL("__MACOSX"), };
264 CR_DEFINE_STATIC_LOCAL(
265 std::set
<base::FilePath::StringType
>,
266 reserved_underscore_names
,
267 (reserved_names
, reserved_names
+ arraysize(reserved_names
)));
269 // Enumerate all files and directories in the extension root.
270 // There is a problem when using pattern "_*" with FileEnumerator, so we have
271 // to cheat with find_first_of and match all.
272 const int kFilesAndDirectories
=
273 base::FileEnumerator::DIRECTORIES
| base::FileEnumerator::FILES
;
274 base::FileEnumerator
all_files(extension_path
, false, kFilesAndDirectories
);
277 while (!(file
= all_files
.Next()).empty()) {
278 base::FilePath::StringType filename
= file
.BaseName().value();
279 // Skip all that don't start with "_".
280 if (filename
.find_first_of(FILE_PATH_LITERAL("_")) != 0)
282 if (reserved_underscore_names
.find(filename
) ==
283 reserved_underscore_names
.end()) {
284 *error
= base::StringPrintf(
285 "Cannot load extension with file or directory name %s. "
286 "Filenames starting with \"_\" are reserved for use by the system.",
287 file
.BaseName().AsUTF8Unsafe().c_str());
295 base::FilePath
GetInstallTempDir(const base::FilePath
& extensions_dir
) {
296 // We do file IO in this function, but only when the current profile's
297 // Temp directory has never been used before, or in a rare error case.
298 // Developers are not likely to see these situations often, so do an
299 // explicit thread check.
300 base::ThreadRestrictions::AssertIOAllowed();
302 // Create the temp directory as a sub-directory of the Extensions directory.
303 // This guarantees it is on the same file system as the extension's eventual
305 base::FilePath temp_path
= extensions_dir
.Append(kTempDirectoryName
);
306 if (base::PathExists(temp_path
)) {
307 if (!base::DirectoryExists(temp_path
)) {
308 DLOG(WARNING
) << "Not a directory: " << temp_path
.value();
309 return base::FilePath();
311 if (!base::PathIsWritable(temp_path
)) {
312 DLOG(WARNING
) << "Can't write to path: " << temp_path
.value();
313 return base::FilePath();
315 // This is a directory we can write to.
319 // Directory doesn't exist, so create it.
320 if (!base::CreateDirectory(temp_path
)) {
321 DLOG(WARNING
) << "Couldn't create directory: " << temp_path
.value();
322 return base::FilePath();
327 void DeleteFile(const base::FilePath
& path
, bool recursive
) {
328 base::DeleteFile(path
, recursive
);
331 base::FilePath
ExtensionURLToRelativeFilePath(const GURL
& url
) {
332 std::string url_path
= url
.path();
333 if (url_path
.empty() || url_path
[0] != '/')
334 return base::FilePath();
336 // Drop the leading slashes and convert %-encoded UTF8 to regular UTF8.
337 std::string file_path
= net::UnescapeURLComponent(url_path
,
338 net::UnescapeRule::SPACES
| net::UnescapeRule::URL_SPECIAL_CHARS
);
339 size_t skip
= file_path
.find_first_not_of("/\\");
340 if (skip
!= file_path
.npos
)
341 file_path
= file_path
.substr(skip
);
343 base::FilePath path
= base::FilePath::FromUTF8Unsafe(file_path
);
345 // It's still possible for someone to construct an annoying URL whose path
346 // would still wind up not being considered relative at this point.
347 // For example: chrome-extension://id/c:////foo.html
348 if (path
.IsAbsolute())
349 return base::FilePath();
354 base::FilePath
ExtensionResourceURLToFilePath(const GURL
& url
,
355 const base::FilePath
& root
) {
356 std::string host
= net::UnescapeURLComponent(url
.host(),
357 net::UnescapeRule::SPACES
| net::UnescapeRule::URL_SPECIAL_CHARS
);
359 return base::FilePath();
361 base::FilePath relative_path
= ExtensionURLToRelativeFilePath(url
);
362 if (relative_path
.empty())
363 return base::FilePath();
365 base::FilePath path
= root
.AppendASCII(host
).Append(relative_path
);
366 if (!base::PathExists(path
))
367 return base::FilePath();
368 path
= base::MakeAbsoluteFilePath(path
);
369 if (path
.empty() || !root
.IsParent(path
))
370 return base::FilePath();
374 bool ValidateExtensionIconSet(const ExtensionIconSet
& icon_set
,
375 const Extension
* extension
,
376 int error_message_id
,
377 std::string
* error
) {
378 for (ExtensionIconSet::IconMap::const_iterator iter
= icon_set
.map().begin();
379 iter
!= icon_set
.map().end();
381 const base::FilePath path
=
382 extension
->GetResource(iter
->second
).GetFilePath();
383 if (!ValidateFilePath(path
)) {
384 *error
= l10n_util::GetStringFUTF8(error_message_id
,
385 base::UTF8ToUTF16(iter
->second
));
392 MessageBundle
* LoadMessageBundle(
393 const base::FilePath
& extension_path
,
394 const std::string
& default_locale
,
395 std::string
* error
) {
397 // Load locale information if available.
398 base::FilePath locale_path
= extension_path
.Append(kLocaleFolder
);
399 if (!base::PathExists(locale_path
))
402 std::set
<std::string
> locales
;
403 if (!extension_l10n_util::GetValidLocales(locale_path
, &locales
, error
))
406 if (default_locale
.empty() || locales
.find(default_locale
) == locales
.end()) {
407 *error
= l10n_util::GetStringUTF8(
408 IDS_EXTENSION_LOCALES_NO_DEFAULT_LOCALE_SPECIFIED
);
412 MessageBundle
* message_bundle
=
413 extension_l10n_util::LoadMessageCatalogs(
416 extension_l10n_util::CurrentLocaleOrDefault(),
420 return message_bundle
;
423 std::map
<std::string
, std::string
>* LoadMessageBundleSubstitutionMap(
424 const base::FilePath
& extension_path
,
425 const std::string
& extension_id
,
426 const std::string
& default_locale
) {
427 std::map
<std::string
, std::string
>* return_value
=
428 new std::map
<std::string
, std::string
>();
429 if (!default_locale
.empty()) {
430 // Touch disk only if extension is localized.
432 scoped_ptr
<MessageBundle
> bundle(
433 LoadMessageBundle(extension_path
, default_locale
, &error
));
436 *return_value
= *bundle
->dictionary();
439 // Add @@extension_id reserved message here, so it's available to
440 // non-localized extensions too.
441 return_value
->insert(
442 std::make_pair(MessageBundle::kExtensionIdKey
, extension_id
));
447 base::FilePath
GetVerifiedContentsPath(const base::FilePath
& extension_path
) {
448 return extension_path
.Append(kMetadataFolder
)
449 .Append(kVerifiedContentsFilename
);
451 base::FilePath
GetComputedHashesPath(const base::FilePath
& extension_path
) {
452 return extension_path
.Append(kMetadataFolder
).Append(kComputedHashesFilename
);
455 } // namespace file_util
456 } // namespace extensions