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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/application_client.h"
#include "base/supports_user_data.h"
#include "components/media_control/browser/media_blocker.h"
#include "components/url_rewrite/browser/url_request_rewrite_rules_manager.h"
#include "components/url_rewrite/common/url_loader_throttle.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_observer.h"
#include "third_party/blink/public/common/loader/url_loader_throttle.h"
namespace cast_receiver {
namespace {
// Key in the WebContents's UserData here the instance for a given WebContents
// is stored.
const char kApplicationControlsUserDataKey[] =
"components/cast_receiver/browser/application_client";
// Helper function to call the method on each observer
template <typename TObserver, typename TFunc, typename... TArgs>
void NotifyObservers(base::ObserverList<TObserver>& observers,
TFunc&& func,
TArgs&&... args) {
for (auto& observer : observers) {
(observer.*func)(args...);
}
}
// This class acts as a wrapper around WebContents-specific classes, acting on
// them based on changes to it. Specifically, it handles connection of any
// cross-process mojo APIs.
class ApplicationControlsImpl : public ApplicationClient::ApplicationControls,
public base::SupportsUserData::Data {
public:
explicit ApplicationControlsImpl(content::WebContents& web_contents)
: web_contents_(web_contents), media_blocker_(&web_contents) {
url_request_rewrite_rules_manager_.AddWebContents(&web_contents);
}
~ApplicationControlsImpl() override {
url_request_rewrite_rules_manager_.RemoveWebContents(&*web_contents_);
}
media_control::MediaBlocker& GetMediaBlocker() override {
return media_blocker_;
}
url_rewrite::UrlRequestRewriteRulesManager& GetUrlRequestRewriteRulesManager()
override {
return url_request_rewrite_rules_manager_;
}
private:
const raw_ref<content::WebContents> web_contents_;
media_control::MediaBlocker media_blocker_;
url_rewrite::UrlRequestRewriteRulesManager url_request_rewrite_rules_manager_;
};
} // namespace
ApplicationClient::ApplicationControls::~ApplicationControls() = default;
ApplicationClient::ApplicationClient(
network::NetworkContextGetter network_context_getter)
: network_context_getter_(std::move(network_context_getter)),
weak_factory_(this) {}
ApplicationClient::~ApplicationClient() = default;
void ApplicationClient::AddStreamingResolutionObserver(
StreamingResolutionObserver* observer) {
streaming_resolution_observer_list_.AddObserver(observer);
}
void ApplicationClient::RemoveStreamingResolutionObserver(
StreamingResolutionObserver* observer) {
streaming_resolution_observer_list_.RemoveObserver(observer);
}
void ApplicationClient::AddApplicationStateObserver(
ApplicationStateObserver* observer) {
application_state_observer_list_.AddObserver(observer);
}
void ApplicationClient::RemoveApplicationStateObserver(
ApplicationStateObserver* observer) {
application_state_observer_list_.RemoveObserver(observer);
}
void ApplicationClient::OnWebContentsCreated(
content::WebContents* web_contents) {
DCHECK(web_contents);
web_contents->SetUserData(
&kApplicationControlsUserDataKey,
std::make_unique<ApplicationControlsImpl>(*web_contents));
}
std::vector<std::unique_ptr<blink::URLLoaderThrottle>>
ApplicationClient::CreateURLLoaderThrottles(
const base::RepeatingCallback<content::WebContents*()>& wc_getter,
content::FrameTreeNodeId frame_tree_node_id,
CorsExemptHeaderCallback is_cors_exempt_header_cb) {
std::vector<std::unique_ptr<blink::URLLoaderThrottle>> throttles;
if (frame_tree_node_id.is_null()) {
return throttles;
}
content::WebContents* web_contents = wc_getter.Run();
if (web_contents) {
const auto& rules = GetApplicationControls(*web_contents)
.GetUrlRequestRewriteRulesManager()
.GetCachedRules();
if (rules) {
throttles.emplace_back(std::make_unique<url_rewrite::URLLoaderThrottle>(
rules, std::move(is_cors_exempt_header_cb)));
}
}
return throttles;
}
void ApplicationClient::OnStreamingResolutionChanged(
const gfx::Rect& size,
const media::VideoTransformation& transformation) {
NotifyObservers(streaming_resolution_observer_list_,
&StreamingResolutionObserver::OnStreamingResolutionChanged,
size, transformation);
}
void ApplicationClient::OnForegroundApplicationChanged(
RuntimeApplication* app) {
NotifyObservers(application_state_observer_list_,
&ApplicationStateObserver::OnForegroundApplicationChanged,
app);
}
ApplicationClient::ApplicationControls&
ApplicationClient::GetApplicationControls(
const content::WebContents& web_contents) {
ApplicationControlsImpl* instance = static_cast<ApplicationControlsImpl*>(
web_contents.GetUserData(&kApplicationControlsUserDataKey));
DCHECK(instance);
return *instance;
}
} // namespace cast_receiver
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