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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/external_pref_extension_provider.h"
#include "app/app_paths.h"
#include "base/file_path.h"
#include "base/file_util.h"
#include "base/path_service.h"
#include "base/string_util.h"
#include "base/utf_string_conversions.h"
#include "base/version.h"
#include "chrome/common/json_value_serializer.h"
// Constants for keeping track of extension preferences.
const char kLocation[] = "location";
const char kState[] = "state";
const char kExternalCrx[] = "external_crx";
const char kExternalVersion[] = "external_version";
const char kExternalUpdateUrl[] = "external_update_url";
ExternalPrefExtensionProvider::ExternalPrefExtensionProvider() {
FilePath json_file;
PathService::Get(app::DIR_EXTERNAL_EXTENSIONS, &json_file);
json_file = json_file.Append(FILE_PATH_LITERAL("external_extensions.json"));
if (file_util::PathExists(json_file)) {
JSONFileValueSerializer serializer(json_file);
SetPreferences(&serializer);
} else {
prefs_.reset(new DictionaryValue());
}
}
ExternalPrefExtensionProvider::~ExternalPrefExtensionProvider() {
}
void ExternalPrefExtensionProvider::SetPreferencesForTesting(
const std::string& json_data_for_testing) {
JSONStringValueSerializer serializer(json_data_for_testing);
SetPreferences(&serializer);
}
void ExternalPrefExtensionProvider::VisitRegisteredExtension(
Visitor* visitor, const std::set<std::string>& ids_to_ignore) const {
for (DictionaryValue::key_iterator i = prefs_->begin_keys();
i != prefs_->end_keys(); ++i) {
const std::string& extension_id = *i;
if (ids_to_ignore.find(extension_id) != ids_to_ignore.end())
continue;
DictionaryValue* extension;
if (!prefs_->GetDictionaryWithoutPathExpansion(extension_id, &extension))
continue;
FilePath::StringType external_crx;
std::string external_version;
std::string external_update_url;
bool has_external_crx = extension->GetString(kExternalCrx, &external_crx);
bool has_external_version = extension->GetString(kExternalVersion,
&external_version);
bool has_external_update_url = extension->GetString(kExternalUpdateUrl,
&external_update_url);
if (has_external_crx != has_external_version) {
LOG(WARNING) << "Malformed extension dictionary for extension: "
<< extension_id.c_str() << ". " << kExternalCrx
<< " and " << kExternalVersion << " must be used together.";
continue;
}
if (has_external_crx == has_external_update_url) {
LOG(WARNING) << "Malformed extension dictionary for extension: "
<< extension_id.c_str() << ". Exactly one of the "
<< "followng keys should be used: " << kExternalCrx
<< ", " << kExternalUpdateUrl << ".";
continue;
}
if (has_external_crx) {
if (external_crx.find(FilePath::kParentDirectory) !=
base::StringPiece::npos) {
LOG(WARNING) << "Path traversal not allowed in path: "
<< external_crx.c_str();
continue;
}
// See if it's an absolute path...
FilePath path(external_crx);
if (!path.IsAbsolute()) {
// Try path as relative path from external extension dir.
FilePath base_path;
PathService::Get(app::DIR_EXTERNAL_EXTENSIONS, &base_path);
path = base_path.Append(external_crx);
}
scoped_ptr<Version> version;
version.reset(Version::GetVersionFromString(external_version));
visitor->OnExternalExtensionFileFound(extension_id, version.get(), path,
Extension::EXTERNAL_PREF);
continue;
}
DCHECK(has_external_update_url); // Checking of keys above ensures this.
GURL update_url(external_update_url);
if (!update_url.is_valid()) {
LOG(WARNING) << "Malformed extension dictionary for extension: "
<< extension_id.c_str() << ". " << kExternalUpdateUrl
<< " must be a valid URL: " << external_update_url;
continue;
}
visitor->OnExternalExtensionUpdateUrlFound(extension_id, update_url);
}
}
Version* ExternalPrefExtensionProvider::RegisteredVersion(
const std::string& id, Extension::Location* location) const {
DictionaryValue* extension = NULL;
if (!prefs_->GetDictionary(id, &extension))
return NULL;
std::string external_version;
if (!extension->GetString(kExternalVersion, &external_version))
return NULL;
if (location)
*location = Extension::EXTERNAL_PREF;
return Version::GetVersionFromString(external_version);
}
void ExternalPrefExtensionProvider::SetPreferences(
ValueSerializer* serializer) {
std::string error_msg;
Value* extensions = serializer->Deserialize(NULL, &error_msg);
scoped_ptr<DictionaryValue> dictionary(new DictionaryValue());
if (!extensions) {
LOG(WARNING) << "Unable to deserialize json data: " << error_msg;
} else {
if (!extensions->IsType(Value::TYPE_DICTIONARY)) {
NOTREACHED() << "Invalid json data";
} else {
dictionary.reset(static_cast<DictionaryValue*>(extensions));
}
}
prefs_.reset(dictionary.release());
}
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