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// Copyright 2014 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/supervised_user/supervised_user_site_list.h"
#include "base/files/file_util.h"
#include "base/json/json_file_value_serializer.h"
#include "base/logging.h"
#include "base/metrics/histogram_macros.h"
#include "base/task_runner_util.h"
#include "base/values.h"
#include "chrome/browser/safe_json_parser.h"
#include "content/public/browser/browser_thread.h"
#include "url/gurl.h"
const int kSitelistFormatVersion = 1;
const char kHostnameHashesKey[] = "hostname_hashes";
const char kNameKey[] = "name";
const char kSitesKey[] = "sites";
const char kSitelistFormatVersionKey[] = "version";
const char kUrlKey[] = "url";
const char kWhitelistKey[] = "whitelist";
namespace {
bool g_load_in_process = false;
std::string ReadFileOnBlockingThread(const base::FilePath& path) {
SCOPED_UMA_HISTOGRAM_TIMER("ManagedUsers.Whitelist.ReadDuration");
std::string contents;
base::ReadFileToString(path, &contents);
return contents;
}
void HandleError(const base::FilePath& path, const std::string& error) {
LOG(ERROR) << "Couldn't load site list " << path.value() << ": " << error;
}
// Takes a DictionaryValue entry from the JSON file and fills the whitelist
// (via URL patterns or hostname hashes) and the URL in the corresponding Site
// struct.
void AddWhitelistEntries(const base::DictionaryValue* site_dict,
SupervisedUserSiteList::Site* site) {
bool found = false;
const base::ListValue* whitelist = nullptr;
if (site_dict->GetList(kWhitelistKey, &whitelist)) {
found = true;
for (const base::Value* entry : *whitelist) {
std::string pattern;
if (!entry->GetAsString(&pattern)) {
LOG(ERROR) << "Invalid whitelist entry";
continue;
}
site->patterns.push_back(pattern);
}
}
const base::ListValue* hash_list = nullptr;
if (site_dict->GetList(kHostnameHashesKey, &hash_list)) {
found = true;
for (const base::Value* entry : *hash_list) {
std::string hash;
if (!entry->GetAsString(&hash)) {
LOG(ERROR) << "Invalid hostname_hashes entry";
continue;
}
// TODO(treib): Check that |hash| has exactly 40 (2*base::kSHA1Length)
// characters from [0-9a-fA-F]. Or just store the raw bytes (from
// base::HexStringToBytes).
site->hostname_hashes.push_back(hash);
}
}
if (found)
return;
// Fall back to using a whitelist based on the URL.
std::string url_str;
if (!site_dict->GetString(kUrlKey, &url_str)) {
LOG(ERROR) << "Whitelist is invalid";
return;
}
GURL url(url_str);
if (!url.is_valid()) {
LOG(ERROR) << "URL " << url_str << " is invalid";
return;
}
site->patterns.push_back(url.host());
}
} // namespace
SupervisedUserSiteList::Site::Site(const base::string16& name) : name(name) {
}
SupervisedUserSiteList::Site::~Site() {
}
void SupervisedUserSiteList::Load(const base::FilePath& path,
const LoadedCallback& callback) {
base::PostTaskAndReplyWithResult(
content::BrowserThread::GetBlockingPool()
->GetTaskRunnerWithShutdownBehavior(
base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN).get(),
FROM_HERE,
base::Bind(&ReadFileOnBlockingThread, path),
base::Bind(&SupervisedUserSiteList::ParseJson, path, callback));
}
// static
void SupervisedUserSiteList::SetLoadInProcessForTesting(bool in_process) {
g_load_in_process = in_process;
}
SupervisedUserSiteList::SupervisedUserSiteList(const base::ListValue& sites) {
for (const base::Value* site : sites) {
const base::DictionaryValue* entry = nullptr;
if (!site->GetAsDictionary(&entry)) {
LOG(ERROR) << "Entry is invalid";
continue;
}
base::string16 name;
entry->GetString(kNameKey, &name);
sites_.push_back(Site(name));
AddWhitelistEntries(entry, &sites_.back());
}
}
SupervisedUserSiteList::~SupervisedUserSiteList() {
}
// static
void SupervisedUserSiteList::ParseJson(
const base::FilePath& path,
const SupervisedUserSiteList::LoadedCallback& callback,
const std::string& json) {
if (g_load_in_process) {
JSONFileValueDeserializer deserializer(path);
std::string error;
scoped_ptr<base::Value> value(deserializer.Deserialize(nullptr, &error));
if (!value) {
HandleError(path, error);
return;
}
OnJsonParseSucceeded(path, base::TimeTicks(), callback, value.Pass());
return;
}
// TODO(bauerb): Use batch mode to load multiple whitelists?
scoped_refptr<SafeJsonParser> parser(new SafeJsonParser(
json,
base::Bind(&SupervisedUserSiteList::OnJsonParseSucceeded, path,
base::TimeTicks::Now(), callback),
base::Bind(&HandleError, path)));
parser->Start();
}
// static
void SupervisedUserSiteList::OnJsonParseSucceeded(
const base::FilePath& path,
base::TimeTicks start_time,
const SupervisedUserSiteList::LoadedCallback& callback,
scoped_ptr<base::Value> value) {
if (!start_time.is_null()) {
UMA_HISTOGRAM_TIMES("ManagedUsers.Whitelist.JsonParseDuration",
base::TimeTicks::Now() - start_time);
}
base::DictionaryValue* dict = nullptr;
if (!value->GetAsDictionary(&dict)) {
LOG(ERROR) << "Site list " << path.value() << " is invalid";
return;
}
int version = 0;
if (!dict->GetInteger(kSitelistFormatVersionKey, &version)) {
LOG(ERROR) << "Site list " << path.value() << " has invalid version";
return;
}
if (version > kSitelistFormatVersion) {
LOG(ERROR) << "Site list " << path.value() << " has a too new format";
return;
}
base::ListValue* sites = nullptr;
if (!dict->GetList(kSitesKey, &sites)) {
LOG(ERROR) << "Site list " << path.value() << " does not contain any sites";
return;
}
callback.Run(make_scoped_refptr(new SupervisedUserSiteList(*sites)));
}
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