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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/stateful_external_extension_provider.h"
#include "app/app_paths.h"
#include "base/file_path.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/values.h"
#include "base/version.h"
namespace {
// 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";
}
StatefulExternalExtensionProvider::StatefulExternalExtensionProvider(
Extension::Location crx_location,
Extension::Location download_location)
: crx_location_(crx_location),
download_location_(download_location) {
}
StatefulExternalExtensionProvider::~StatefulExternalExtensionProvider() {
}
void StatefulExternalExtensionProvider::VisitRegisteredExtension(
Visitor* visitor) const {
for (DictionaryValue::key_iterator i = prefs_->begin_keys();
i != prefs_->end_keys(); ++i) {
const std::string& extension_id = *i;
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 (crx_location_ == Extension::INVALID) {
LOG(WARNING) << "This provider does not support installing external "
<< "extensions from crx files.";
continue;
}
if (external_crx.find(FilePath::kParentDirectory) !=
base::StringPiece::npos) {
LOG(WARNING) << "Path traversal not allowed in path: "
<< external_crx.c_str();
continue;
}
// If the path is relative, make it absolute.
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));
if (!version.get()) {
LOG(WARNING) << "Malformed extension dictionary for extension: "
<< extension_id.c_str() << ". Invalid version string \""
<< external_version << "\".";
continue;
}
visitor->OnExternalExtensionFileFound(extension_id, version.get(), path,
crx_location_);
} else { // if (has_external_update_url)
DCHECK(has_external_update_url); // Checking of keys above ensures this.
if (download_location_ == Extension::INVALID) {
LOG(WARNING) << "This provider does not support installing external "
<< "extensions from update URLs.";
continue;
}
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. Saw \"" << external_update_url
<< "\".";
continue;
}
visitor->OnExternalExtensionUpdateUrlFound(
extension_id, update_url, download_location_);
}
}
}
bool StatefulExternalExtensionProvider::HasExtension(
const std::string& id) const {
return prefs_->HasKey(id);
}
bool StatefulExternalExtensionProvider::GetExtensionDetails(
const std::string& id, Extension::Location* location,
scoped_ptr<Version>* version) const {
DictionaryValue* extension = NULL;
if (!prefs_->GetDictionary(id, &extension))
return false;
Extension::Location loc = Extension::INVALID;
if (extension->HasKey(kExternalUpdateUrl)) {
loc = download_location_;
} else if (extension->HasKey(kExternalCrx)) {
loc = crx_location_;
std::string external_version;
if (!extension->GetString(kExternalVersion, &external_version))
return false;
if (version)
version->reset(Version::GetVersionFromString(external_version));
} else {
NOTREACHED(); // Chrome should not allow prefs to get into this state.
return false;
}
if (location)
*location = loc;
return true;
}
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