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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/cast_receiver/browser/bindings_message_port_connector.h"
#include <string>
#include <utility>
#include "base/functional/bind.h"
#include "base/strings/utf_string_conversions.h"
#include "components/cast/message_port/cast/message_port_cast.h"
#include "components/cast/named_message_port_connector/grit/named_message_port_connector_resources.h"
#include "content/public/browser/message_port_provider.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/web_contents.h"
#include "third_party/blink/public/common/messaging/web_message_port.h"
#include "ui/base/resource/resource_bundle.h"
namespace cast_receiver {
namespace {
constexpr uint64_t kNamedMessagePortConnectorBindingsId = 1000;
// Adds a return value to a void function, as the caller requires the method
// signature return a bool and base::BindRepeating cannot use weak_ptrs with
// non-void functions.
bool AddReturnValue(
base::WeakPtr<BindingsMessagePortConnector> ptr,
base::RepeatingCallback<
void(std::string_view, std::unique_ptr<cast_api_bindings::MessagePort>)>
callback,
std::string_view port_name,
std::unique_ptr<cast_api_bindings::MessagePort> port) {
callback.Run(std::move(port_name), std::move(port));
return !!ptr;
}
} // namespace
BindingsMessagePortConnector::Client::~Client() = default;
BindingsMessagePortConnector::BindingsMessagePortConnector(
content::WebContents* web_contents,
Client& client)
: content::WebContentsObserver(web_contents),
PageStateObserver(web_contents),
client_(client),
weak_factory_(this) {
// Register the port connection JS script for early injection.
std::string bindings_script_string =
ui::ResourceBundle::GetSharedInstance().LoadDataResourceString(
IDR_PORT_CONNECTOR_JS);
if (!bindings_script_string.empty()) {
AddBeforeLoadJavaScript(kNamedMessagePortConnectorBindingsId,
bindings_script_string);
}
}
BindingsMessagePortConnector::~BindingsMessagePortConnector() = default;
void BindingsMessagePortConnector::ConnectToBindingsService() {
auto on_port_connected_cb =
base::BindRepeating(&BindingsMessagePortConnector::OnPortConnected,
weak_factory_.GetWeakPtr());
RegisterPortHandler(base::BindRepeating(&AddReturnValue,
weak_factory_.GetWeakPtr(),
std::move(on_port_connected_cb)));
// Fetch bindings and inject scripts into |script_injector_|.
std::vector<Client::ApiBinding> bindings = client_->GetAllBindings();
if (bindings.empty()) {
LOG(ERROR) << "Received empty bindings.";
client_->OnError();
} else {
constexpr uint64_t kBindingsIdStart = 0xFF0000;
// Enumerate and inject all scripts in |bindings|.
uint64_t bindings_id = kBindingsIdStart;
for (auto& entry : bindings) {
AddBeforeLoadJavaScript(bindings_id++, entry.script);
}
}
}
void BindingsMessagePortConnector::AddBeforeLoadJavaScript(
uint64_t id,
std::string_view script) {
script_injector_.AddScriptForAllOrigins(id, std::string(script));
}
void BindingsMessagePortConnector::OnPortConnected(
std::string_view port_name,
std::unique_ptr<cast_api_bindings::MessagePort> port) {
client_->Connect(
std::string(port_name),
cast_api_bindings::MessagePortCast::FromMessagePort(port.get())
->TakePort()
.PassPort());
}
void BindingsMessagePortConnector::OnPageLoadComplete() {
// Send the port connection message to the page once it is loaded.
std::string connect_message;
std::unique_ptr<cast_api_bindings::MessagePort> port;
GetConnectMessage(&connect_message, &port);
std::vector<blink::WebMessagePort> ports;
ports.push_back(
cast_api_bindings::MessagePortCast::FromMessagePort(port.get())
->TakePort());
DCHECK(!connect_message.empty());
std::u16string data_utf16 = base::UTF8ToUTF16(connect_message);
const std::optional<std::u16string> target_origin_utf16;
content::MessagePortProvider::PostMessageToFrame(
web_contents()->GetPrimaryPage(), std::u16string(), target_origin_utf16,
data_utf16, std::move(ports));
}
void BindingsMessagePortConnector::DidStartNavigation(
content::NavigationHandle* navigation_handle) {
if (!navigation_handle->IsInPrimaryMainFrame() ||
navigation_handle->IsSameDocument()) {
return;
}
// Main frame has an ongoing navigation. This might overwrite a
// previously active navigation. We only care about tracking
// the most recent main frame navigation.
active_navigation_ = navigation_handle;
}
void BindingsMessagePortConnector::DidFinishNavigation(
content::NavigationHandle* navigation_handle) {
// Ignore sub-frame and non-current main frame navigation.
if (navigation_handle != active_navigation_) {
return;
}
active_navigation_ = nullptr;
}
void BindingsMessagePortConnector::ReadyToCommitNavigation(
content::NavigationHandle* navigation_handle) {
// Skip injecting bindings scripts if |navigation_handle| is not
// 'current' main frame navigation, e.g. another DidStartNavigation is
// emitted. Also skip injecting for same document navigation and error page.
if (navigation_handle == active_navigation_ &&
!navigation_handle->IsErrorPage()) {
// Injects registered bindings script into the main frame.
script_injector_.InjectScriptsForURL(
navigation_handle->GetURL(), navigation_handle->GetRenderFrameHost());
}
}
} // namespace cast_receiver
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