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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 "extensions/browser/api/messaging/native_message_host.h"
#include <string>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/command_line.h"
#include "base/json/json_reader.h"
#include "base/json/json_writer.h"
#include "base/location.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop/message_loop_proxy.h"
#include "base/values.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/extensions/api/messaging/native_messaging_test_util.h"
#include "components/policy/core/common/policy_service.h"
#include "extensions/common/constants.h"
#include "extensions/common/switches.h"
#include "extensions/common/url_pattern.h"
#include "net/url_request/url_request_context_getter.h"
#if defined(USE_X11)
#include "remoting/host/chromoting_host_context.h"
#include "remoting/host/it2me/it2me_native_messaging_host.h"
# endif // defined(USE_X11)
#include "ui/gfx/native_widget_types.h"
#include "url/gurl.h"
namespace extensions {
namespace {
// A simple NativeMessageHost that mimics the implementation of
// chrome/test/data/native_messaging/native_hosts/echo.py. It is currently
// used for testing by ExtensionApiTest::NativeMessagingBasic.
const char* const kEchoHostOrigins[] = {
// ScopedTestNativeMessagingHost::kExtensionId
"chrome-extension://knldjmfmopnpolahpmmgbagdohdnhkik/"};
class EchoHost : public NativeMessageHost {
public:
static scoped_ptr<NativeMessageHost> Create() {
return scoped_ptr<NativeMessageHost>(new EchoHost());
}
EchoHost() : message_number_(0), client_(NULL) {}
virtual void Start(Client* client) override {
client_ = client;
}
virtual void OnMessage(const std::string& request_string) override {
scoped_ptr<base::Value> request_value(
base::JSONReader::Read(request_string));
scoped_ptr<base::DictionaryValue> request(
static_cast<base::DictionaryValue*>(request_value.release()));
if (request_string.find("stopHostTest") != std::string::npos) {
client_->CloseChannel(kNativeHostExited);
} else if (request_string.find("bigMessageTest") != std::string::npos) {
client_->CloseChannel(kHostInputOuputError);
} else {
ProcessEcho(*request);
}
};
virtual scoped_refptr<base::SingleThreadTaskRunner> task_runner()
const override {
return base::MessageLoopProxy::current();
};
private:
void ProcessEcho(const base::DictionaryValue& request) {
scoped_ptr<base::DictionaryValue> response(new base::DictionaryValue());
response->SetInteger("id", ++message_number_);
response->Set("echo", request.DeepCopy());
response->SetString("caller_url", kEchoHostOrigins[0]);
std::string response_string;
base::JSONWriter::Write(response.get(), &response_string);
client_->PostMessageFromNativeHost(response_string);
}
int message_number_;
Client* client_;
DISALLOW_COPY_AND_ASSIGN(EchoHost);
};
struct BuiltInHost {
const char* const name;
const char* const* const allowed_origins;
int allowed_origins_count;
scoped_ptr<NativeMessageHost>(*create_function)();
};
// Remote assistance currently only supports X11.
// TODO(kelvinp): Migrate to ozone once it is ready (crbug.com/426716).
#if defined(USE_X11)
scoped_ptr<NativeMessageHost> CreateIt2MeHost() {
if (CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableRemoteAssistance)) {
scoped_ptr<remoting::It2MeHostFactory> host_factory(
new remoting::It2MeHostFactory());
host_factory->set_policy_service(g_browser_process->policy_service());
scoped_ptr<remoting::ChromotingHostContext> context =
remoting::ChromotingHostContext::CreateForChromeOS(
make_scoped_refptr(g_browser_process->system_request_context()));
scoped_ptr<NativeMessageHost> host(new remoting::It2MeNativeMessagingHost(
context.Pass(), host_factory.Pass()));
return host.Pass();
}
return nullptr;
}
// If you modify the list of allowed_origins, don't forget to update
// remoting/host/it2me/com.google.chrome.remote_assistance.json.jinja2
// to keep the two lists in sync.
// TODO(kelvinp): Load the native messaging manifest as a resource file into
// chrome and fetch the list of allowed_origins from the manifest (see
// crbug/424743).
const char* const kRemotingIt2MeOrigins[] = {
"chrome-extension://ljacajndfccfgnfohlgkdphmbnpkjflk/",
"chrome-extension://gbchcmhmhahfdphkhkmpfmihenigjmpp/",
"chrome-extension://kgngmbheleoaphbjbaiobfdepmghbfah/",
"chrome-extension://odkaodonbgfohohmklejpjiejmcipmib/",
"chrome-extension://dokpleeekgeeiehdhmdkeimnkmoifgdd/",
"chrome-extension://ajoainacpilcemgiakehflpbkbfipojk/",
"chrome-extension://hmboipgjngjoiaeicfdifdoeacilalgc/"};
#endif // defined(USE_X11)
static const BuiltInHost kBuiltInHost[] = {
{"com.google.chrome.test.echo", // ScopedTestNativeMessagingHost::kHostName
kEchoHostOrigins,
arraysize(kEchoHostOrigins),
&EchoHost::Create},
#if defined(USE_X11)
{"com.google.chrome.remote_assistance",
kRemotingIt2MeOrigins,
arraysize(kRemotingIt2MeOrigins),
&CreateIt2MeHost},
#endif // defined(USE_X11)
};
bool MatchesSecurityOrigin(const BuiltInHost& host,
const std::string& extension_id) {
GURL origin(std::string(kExtensionScheme) + "://" + extension_id);
for (int i = 0; i < host.allowed_origins_count; i++) {
URLPattern allowed_origin(URLPattern::SCHEME_ALL, host.allowed_origins[i]);
if (allowed_origin.MatchesSecurityOrigin(origin)) {
return true;
}
}
return false;
}
} // namespace
scoped_ptr<NativeMessageHost> NativeMessageHost::Create(
gfx::NativeView native_view,
const std::string& source_extension_id,
const std::string& native_host_name,
bool allow_user_level,
std::string* error) {
for (unsigned int i = 0; i < arraysize(kBuiltInHost); i++) {
const BuiltInHost& host = kBuiltInHost[i];
std::string name(host.name);
if (name == native_host_name) {
if (MatchesSecurityOrigin(host, source_extension_id)) {
return (*host.create_function)();
}
*error = kForbiddenError;
return nullptr;
}
}
*error = kNotFoundError;
return nullptr;
}
} // namespace extensions
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