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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/extensions/api/messaging/native_messaging_test_util.h"
#include "extensions/common/constants.h"
#include "extensions/common/url_pattern.h"
#include "ui/gfx/native_widget_types.h"
#include "url/gurl.h"
namespace extensions {
namespace {
// A simple NativeMesageHost that echoes the received message. It is currently
// used for testing.
// TODO(kelvinp): Replace this class once Remote Assistance in process host
// is implemented.
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)();
};
// 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.
/*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/"};*/
static const BuiltInHost kBuiltInHost[] = {
{"com.google.chrome.test.echo", // ScopedTestNativeMessagingHost::kHostName
kEchoHostOrigins,
arraysize(kEchoHostOrigins),
&EchoHost::Create},
};
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);
DCHECK_EQ(URLPattern::PARSE_SUCCESS,
allowed_origin.Parse(host.allowed_origins[i]));
LOG(ERROR) << "allowed_origin is " << allowed_origin.GetAsString()
<< " and extension_id is " << extension_id;
if (allowed_origin.MatchesSecurityOrigin(origin)) {
LOG(ERROR) << "Pattern matched";
return true;
}
}
LOG(ERROR) << "Pattern mismatched";
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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