LibWeb: Abstract the LibProtocol ResourceLoader connection

This is the final component that required LibProtocol as a dependency
of LibWeb. With this, we can now remove the dependency, and LibWeb no
longer requires IPC to work :^)

10 files changed, 245 insertions, 37 deletions

diff --git a/Userland/Applications/Browser/DownloadWidget.cpp b/Userland/Applications/Browser/DownloadWidget.cpp
index cfd2c82f8b..cfc6df68dd 100644
--- a/Userland/Applications/Browser/DownloadWidget.cpp
+++ b/Userland/Applications/Browser/DownloadWidget.cpp
@@ -23,7 +23,6 @@
 #include <LibWeb/Loader/ResourceLoader.h>
 
 #include <LibConfig/Client.h>
-#include <LibProtocol/RequestClient.h>
 
 namespace Browser {
 
@@ -41,7 +40,7 @@ DownloadWidget::DownloadWidget(const URL& url)
     auto close_on_finish = Config::read_bool("Browser", "Preferences", "CloseDownloadWidgetOnFinish", false);
 
     m_elapsed_timer.start();
-    m_download = Web::ResourceLoader::the().protocol_client().start_request("GET", url);
+    m_download = Web::ResourceLoader::the().connector().start_request("GET", url);
     VERIFY(m_download);
     m_download->on_progress = [this](Optional<u32> total_size, u32 downloaded_size) {
         did_progress(total_size.value(), downloaded_size);
diff --git a/Userland/Applications/Browser/DownloadWidget.h b/Userland/Applications/Browser/DownloadWidget.h
index c4b8604856..21fc7641ab 100644
--- a/Userland/Applications/Browser/DownloadWidget.h
+++ b/Userland/Applications/Browser/DownloadWidget.h
@@ -13,7 +13,7 @@
 #include <LibGUI/ImageWidget.h>
 #include <LibGUI/Progressbar.h>
 #include <LibGUI/Widget.h>
-#include <LibProtocol/Request.h>
+#include <LibWeb/Loader/ResourceLoader.h>
 
 namespace Browser {
 
@@ -31,7 +31,7 @@ private:
 
     URL m_url;
     String m_destination_path;
-    RefPtr<Protocol::Request> m_download;
+    RefPtr<Web::ResourceLoaderConnectorRequest> m_download;
     RefPtr<GUI::Progressbar> m_progressbar;
     RefPtr<GUI::Label> m_progress_label;
     RefPtr<GUI::Button> m_cancel_button;
diff --git a/Userland/Applications/Browser/main.cpp b/Userland/Applications/Browser/main.cpp
index 3d4665c209..65c9cd5aab 100644
--- a/Userland/Applications/Browser/main.cpp
+++ b/Userland/Applications/Browser/main.cpp
@@ -23,6 +23,8 @@
 #include <LibGUI/Icon.h>
 #include <LibGUI/TabWidget.h>
 #include <LibMain/Main.h>
+#include <LibWeb/Loader/ResourceLoader.h>
+#include <LibWebView/RequestServerAdapter.h>
 #include <unistd.h>
 
 namespace Browser {
@@ -87,6 +89,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Core::System::unveil("/bin/BrowserSettings", "x"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
+    Web::ResourceLoader::initialize(TRY(WebView::RequestServerAdapter::try_create()));
+
     auto app_icon = GUI::Icon::default_icon("app-browser");
 
     Browser::g_home_url = Config::read_string("Browser", "Preferences", "Home", "file:///res/html/misc/welcome.html");
diff --git a/Userland/Libraries/LibWeb/CMakeLists.txt b/Userland/Libraries/LibWeb/CMakeLists.txt
index c34632302a..9e10768eef 100644
--- a/Userland/Libraries/LibWeb/CMakeLists.txt
+++ b/Userland/Libraries/LibWeb/CMakeLists.txt
@@ -359,11 +359,6 @@ set(SOURCES
     XML/XMLDocumentBuilder.cpp
 )
 
-set(GENERATED_SOURCES
-    ../../Services/RequestServer/RequestClientEndpoint.h
-    ../../Services/RequestServer/RequestServerEndpoint.h
-)
-
 generate_css_implementation()
 
 set(GENERATED_SOURCES
@@ -377,7 +372,7 @@ set(GENERATED_SOURCES
 )
 
 serenity_lib(LibWeb web)
-target_link_libraries(LibWeb LibCore LibJS LibMarkdown LibGemini LibGUI LibGfx LibTextCodec LibProtocol LibWasm LibXML)
+target_link_libraries(LibWeb LibCore LibJS LibMarkdown LibGemini LibGUI LibGfx LibTextCodec LibWasm LibXML)
 link_with_unicode_data(LibWeb)
 
 generate_js_wrappers(LibWeb)
diff --git a/Userland/Libraries/LibWeb/Loader/ResourceLoader.cpp b/Userland/Libraries/LibWeb/Loader/ResourceLoader.cpp
index e45ae44d27..c79b17ea8e 100644
--- a/Userland/Libraries/LibWeb/Loader/ResourceLoader.cpp
+++ b/Userland/Libraries/LibWeb/Loader/ResourceLoader.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2022, Dex♪ <dexes.ttp@gmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -10,8 +11,6 @@
 #include <LibCore/ElapsedTimer.h>
 #include <LibCore/EventLoop.h>
 #include <LibCore/File.h>
-#include <LibProtocol/Request.h>
-#include <LibProtocol/RequestClient.h>
 #include <LibWeb/Loader/ContentFilter.h>
 #include <LibWeb/Loader/LoadRequest.h>
 #include <LibWeb/Loader/ProxyMappings.h>
@@ -24,35 +23,50 @@
 
 namespace Web {
 
-ResourceLoader& ResourceLoader::the()
+ResourceLoaderConnectorRequest::ResourceLoaderConnectorRequest() = default;
+
+ResourceLoaderConnectorRequest::~ResourceLoaderConnectorRequest() = default;
+
+ResourceLoaderConnector::ResourceLoaderConnector() = default;
+
+ResourceLoaderConnector::~ResourceLoaderConnector() = default;
+
+static RefPtr<ResourceLoader> s_resource_loader;
+
+void ResourceLoader::initialize(RefPtr<ResourceLoaderConnector> connector)
 {
-    static RefPtr<ResourceLoader> s_the;
-    if (!s_the)
-        s_the = ResourceLoader::try_create().release_value_but_fixme_should_propagate_errors();
-    return *s_the;
+    if (connector)
+        s_resource_loader = ResourceLoader::try_create(connector.release_nonnull()).release_value_but_fixme_should_propagate_errors();
 }
 
-ErrorOr<NonnullRefPtr<ResourceLoader>> ResourceLoader::try_create()
+ResourceLoader& ResourceLoader::the()
 {
+    if (!s_resource_loader) {
+        dbgln("Web::ResourceLoader was not initialized");
+        VERIFY_NOT_REACHED();
+    }
+    return *s_resource_loader;
+}
 
-    auto protocol_client = TRY(Protocol::RequestClient::try_create());
-    return adopt_nonnull_ref_or_enomem(new (nothrow) ResourceLoader(move(protocol_client)));
+ErrorOr<NonnullRefPtr<ResourceLoader>> ResourceLoader::try_create(NonnullRefPtr<ResourceLoaderConnector> connector)
+{
+    return adopt_nonnull_ref_or_enomem(new (nothrow) ResourceLoader(move(connector)));
 }
 
-ResourceLoader::ResourceLoader(NonnullRefPtr<Protocol::RequestClient> protocol_client)
-    : m_protocol_client(move(protocol_client))
+ResourceLoader::ResourceLoader(NonnullRefPtr<ResourceLoaderConnector> connector)
+    : m_connector(move(connector))
     , m_user_agent(default_user_agent)
 {
 }
 
 void ResourceLoader::prefetch_dns(AK::URL const& url)
 {
-    m_protocol_client->ensure_connection(url, RequestServer::CacheLevel::ResolveOnly);
+    m_connector->prefetch_dns(url);
 }
 
 void ResourceLoader::preconnect(AK::URL const& url)
 {
-    m_protocol_client->ensure_connection(url, RequestServer::CacheLevel::CreateConnection);
+    m_connector->preconnect(url);
 }
 
 static HashMap<LoadRequest, NonnullRefPtr<Resource>> s_resource_cache;
@@ -217,7 +231,7 @@ void ResourceLoader::load(LoadRequest& request, Function<void(ReadonlyBytes, Has
             headers.set(it.key, it.value);
         }
 
-        auto protocol_request = protocol_client().start_request(request.method(), url, headers, request.body(), proxy);
+        auto protocol_request = m_connector->start_request(request.method(), url, headers, request.body(), proxy);
         if (!protocol_request) {
             auto start_request_failure_msg = "Failed to initiate load"sv;
             log_failure(request, start_request_failure_msg);
@@ -248,7 +262,7 @@ void ResourceLoader::load(LoadRequest& request, Function<void(ReadonlyBytes, Has
             });
         };
         protocol_request->set_should_buffer_all_input(true);
-        protocol_request->on_certificate_requested = []() -> Protocol::Request::CertificateAndKey {
+        protocol_request->on_certificate_requested = []() -> ResourceLoaderConnectorRequest::CertificateAndKey {
             return {};
         };
         ++m_pending_loads;
diff --git a/Userland/Libraries/LibWeb/Loader/ResourceLoader.h b/Userland/Libraries/LibWeb/Loader/ResourceLoader.h
index 59cce5bd75..986447316a 100644
--- a/Userland/Libraries/LibWeb/Loader/ResourceLoader.h
+++ b/Userland/Libraries/LibWeb/Loader/ResourceLoader.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2022, Dex♪ <dexes.ttp@gmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -7,15 +8,13 @@
 #pragma once
 
 #include <AK/Function.h>
+#include <AK/HashMap.h>
+#include <AK/String.h>
 #include <AK/URL.h>
 #include <LibCore/Object.h>
+#include <LibCore/Proxy.h>
 #include <LibWeb/Loader/Resource.h>
 
-namespace Protocol {
-class RequestClient;
-class Request;
-}
-
 namespace Web {
 
 #if ARCH(I386)
@@ -26,9 +25,46 @@ namespace Web {
 
 constexpr auto default_user_agent = "Mozilla/5.0 (SerenityOS; " CPU_STRING ") LibWeb+LibJS/1.0 Browser/1.0";
 
+class ResourceLoaderConnectorRequest : public RefCounted<ResourceLoaderConnectorRequest> {
+public:
+    virtual ~ResourceLoaderConnectorRequest();
+
+    struct CertificateAndKey {
+        String certificate;
+        String key;
+    };
+
+    virtual void set_should_buffer_all_input(bool) = 0;
+    virtual bool stop() = 0;
+
+    virtual void stream_into(Core::Stream::Stream&) = 0;
+
+    Function<void(bool success, u32 total_size, HashMap<String, String, CaseInsensitiveStringTraits> const& response_headers, Optional<u32> response_code, ReadonlyBytes payload)> on_buffered_request_finish;
+    Function<void(bool success, u32 total_size)> on_finish;
+    Function<void(Optional<u32> total_size, u32 downloaded_size)> on_progress;
+    Function<CertificateAndKey()> on_certificate_requested;
+
+protected:
+    explicit ResourceLoaderConnectorRequest();
+};
+
+class ResourceLoaderConnector : public RefCounted<ResourceLoaderConnector> {
+public:
+    virtual ~ResourceLoaderConnector();
+
+    virtual void prefetch_dns(AK::URL const&) = 0;
+    virtual void preconnect(AK::URL const&) = 0;
+
+    virtual RefPtr<ResourceLoaderConnectorRequest> start_request(String const& method, AK::URL const&, HashMap<String, String> const& request_headers = {}, ReadonlyBytes request_body = {}, Core::ProxyData const& = {}) = 0;
+
+protected:
+    explicit ResourceLoaderConnector();
+};
+
 class ResourceLoader : public Core::Object {
     C_OBJECT_ABSTRACT(ResourceLoader)
 public:
+    static void initialize(RefPtr<ResourceLoaderConnector>);
     static ResourceLoader& the();
 
     RefPtr<Resource> load_resource(Resource::Type, LoadRequest&);
@@ -36,6 +72,8 @@ public:
     void load(LoadRequest&, Function<void(ReadonlyBytes, HashMap<String, String, CaseInsensitiveStringTraits> const& response_headers, Optional<u32> status_code)> success_callback, Function<void(String const&, Optional<u32> status_code)> error_callback = nullptr);
     void load(const AK::URL&, Function<void(ReadonlyBytes, HashMap<String, String, CaseInsensitiveStringTraits> const& response_headers, Optional<u32> status_code)> success_callback, Function<void(String const&, Optional<u32> status_code)> error_callback = nullptr);
 
+    ResourceLoaderConnector& connector() { return *m_connector; }
+
     void prefetch_dns(AK::URL const&);
     void preconnect(AK::URL const&);
 
@@ -43,8 +81,6 @@ public:
 
     int pending_loads() const { return m_pending_loads; }
 
-    Protocol::RequestClient& protocol_client() { return *m_protocol_client; }
-
     String const& user_agent() const { return m_user_agent; }
     void set_user_agent(String const& user_agent) { m_user_agent = user_agent; }
 
@@ -52,15 +88,15 @@ public:
     void evict_from_cache(LoadRequest const&);
 
 private:
-    ResourceLoader(NonnullRefPtr<Protocol::RequestClient> protocol_client);
-    static ErrorOr<NonnullRefPtr<ResourceLoader>> try_create();
+    ResourceLoader(NonnullRefPtr<ResourceLoaderConnector>);
+    static ErrorOr<NonnullRefPtr<ResourceLoader>> try_create(NonnullRefPtr<ResourceLoaderConnector>);
 
     static bool is_port_blocked(int port);
 
     int m_pending_loads { 0 };
 
-    HashTable<NonnullRefPtr<Protocol::Request>> m_active_requests;
-    RefPtr<Protocol::RequestClient> m_protocol_client;
+    HashTable<NonnullRefPtr<ResourceLoaderConnectorRequest>> m_active_requests;
+    NonnullRefPtr<ResourceLoaderConnector> m_connector;
     String m_user_agent;
 };
 
diff --git a/Userland/Libraries/LibWebView/CMakeLists.txt b/Userland/Libraries/LibWebView/CMakeLists.txt
index 4fa461b816..77852b5ed6 100644
--- a/Userland/Libraries/LibWebView/CMakeLists.txt
+++ b/Userland/Libraries/LibWebView/CMakeLists.txt
@@ -2,6 +2,7 @@ set(SOURCES
     DOMTreeModel.cpp
     ImageDecoderClientAdapter.cpp
     OutOfProcessWebView.cpp
+    RequestServerAdapter.cpp
     StylePropertiesModel.cpp
     WebContentClient.cpp
     WebSocketClientAdapter.cpp
diff --git a/Userland/Libraries/LibWebView/RequestServerAdapter.cpp b/Userland/Libraries/LibWebView/RequestServerAdapter.cpp
new file mode 100644
index 0000000000..be2374d869
--- /dev/null
+++ b/Userland/Libraries/LibWebView/RequestServerAdapter.cpp
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2022, Dex♪ <dexes.ttp@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCore/File.h>
+#include <LibProtocol/Request.h>
+#include <LibProtocol/RequestClient.h>
+#include <LibWebView/RequestServerAdapter.h>
+
+namespace WebView {
+
+ErrorOr<NonnullRefPtr<RequestServerRequestAdapter>> RequestServerRequestAdapter::try_create(NonnullRefPtr<Protocol::Request> request)
+{
+    return adopt_nonnull_ref_or_enomem(new (nothrow) RequestServerRequestAdapter(move(request)));
+}
+
+RequestServerRequestAdapter::RequestServerRequestAdapter(NonnullRefPtr<Protocol::Request> request)
+    : m_request(request)
+{
+    request->on_buffered_request_finish = [weak_this = make_weak_ptr()](auto success, auto total_size, auto const& response_headers, auto response_code, auto payload) {
+        if (auto strong_this = weak_this.strong_ref())
+            if (strong_this->on_buffered_request_finish)
+                strong_this->on_buffered_request_finish(success, total_size, response_headers, response_code, move(payload));
+    };
+
+    request->on_finish = [weak_this = make_weak_ptr()](bool success, u32 total_size) {
+        if (auto strong_this = weak_this.strong_ref())
+            if (strong_this->on_finish)
+                strong_this->on_finish(success, total_size);
+    };
+
+    request->on_progress = [weak_this = make_weak_ptr()](Optional<u32> total_size, u32 downloaded_size) {
+        if (auto strong_this = weak_this.strong_ref())
+            if (strong_this->on_progress)
+                strong_this->on_progress(total_size, downloaded_size);
+    };
+
+    request->on_certificate_requested = [weak_this = make_weak_ptr()]() {
+        if (auto strong_this = weak_this.strong_ref()) {
+            if (strong_this->on_certificate_requested) {
+                auto certificate_and_key = strong_this->on_certificate_requested();
+                return Protocol::Request::CertificateAndKey {
+                    .certificate = move(certificate_and_key.certificate),
+                    .key = move(certificate_and_key.key),
+                };
+            }
+        }
+
+        return Protocol::Request::CertificateAndKey {};
+    };
+}
+
+RequestServerRequestAdapter::~RequestServerRequestAdapter() = default;
+
+void RequestServerRequestAdapter::set_should_buffer_all_input(bool should_buffer_all_input)
+{
+    m_request->set_should_buffer_all_input(should_buffer_all_input);
+}
+
+bool RequestServerRequestAdapter::stop()
+{
+    return m_request->stop();
+}
+
+void RequestServerRequestAdapter::stream_into(Core::Stream::Stream& stream)
+{
+    m_request->stream_into(stream);
+}
+
+ErrorOr<NonnullRefPtr<RequestServerAdapter>> RequestServerAdapter::try_create()
+{
+    auto protocol_client = TRY(Protocol::RequestClient::try_create());
+    return adopt_nonnull_ref_or_enomem(new (nothrow) RequestServerAdapter(move(protocol_client)));
+}
+
+RequestServerAdapter::RequestServerAdapter(NonnullRefPtr<Protocol::RequestClient> protocol_client)
+    : m_protocol_client(protocol_client)
+{
+}
+
+RequestServerAdapter::~RequestServerAdapter() = default;
+
+RefPtr<Web::ResourceLoaderConnectorRequest> RequestServerAdapter::start_request(String const& method, URL const& url, HashMap<String, String> const& headers, ReadonlyBytes body, Core::ProxyData const& proxy)
+{
+    auto protocol_request = m_protocol_client->start_request(method, url, headers, body, proxy);
+    if (!protocol_request)
+        return {};
+    return RequestServerRequestAdapter::try_create(protocol_request.release_nonnull()).release_value_but_fixme_should_propagate_errors();
+}
+
+void RequestServerAdapter::prefetch_dns(AK::URL const& url)
+{
+    m_protocol_client->ensure_connection(url, RequestServer::CacheLevel::ResolveOnly);
+}
+
+void RequestServerAdapter::preconnect(AK::URL const& url)
+{
+    m_protocol_client->ensure_connection(url, RequestServer::CacheLevel::CreateConnection);
+}
+
+}
diff --git a/Userland/Libraries/LibWebView/RequestServerAdapter.h b/Userland/Libraries/LibWebView/RequestServerAdapter.h
new file mode 100644
index 0000000000..0aca3dbdcb
--- /dev/null
+++ b/Userland/Libraries/LibWebView/RequestServerAdapter.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2022, Dex♪ <dexes.ttp@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Function.h>
+#include <AK/URL.h>
+#include <LibWeb/Loader/ResourceLoader.h>
+
+namespace Protocol {
+class Request;
+class RequestClient;
+}
+
+namespace WebView {
+
+class RequestServerRequestAdapter
+    : public Web::ResourceLoaderConnectorRequest
+    , public Weakable<RequestServerRequestAdapter> {
+public:
+    static ErrorOr<NonnullRefPtr<RequestServerRequestAdapter>> try_create(NonnullRefPtr<Protocol::Request>);
+    virtual ~RequestServerRequestAdapter() override;
+
+    virtual void set_should_buffer_all_input(bool) override;
+    virtual bool stop() override;
+
+    virtual void stream_into(Core::Stream::Stream&) override;
+
+private:
+    RequestServerRequestAdapter(NonnullRefPtr<Protocol::Request>);
+    NonnullRefPtr<Protocol::Request> m_request;
+};
+
+class RequestServerAdapter : public Web::ResourceLoaderConnector {
+public:
+    static ErrorOr<NonnullRefPtr<RequestServerAdapter>> try_create();
+    virtual ~RequestServerAdapter() override;
+
+    virtual void prefetch_dns(AK::URL const& url) override;
+    virtual void preconnect(AK::URL const& url) override;
+
+    virtual RefPtr<Web::ResourceLoaderConnectorRequest> start_request(String const& method, URL const&, HashMap<String, String> const& request_headers = {}, ReadonlyBytes request_body = {}, Core::ProxyData const& = {}) override;
+
+private:
+    RequestServerAdapter(NonnullRefPtr<Protocol::RequestClient> protocol_client);
+
+    RefPtr<Protocol::RequestClient> m_protocol_client;
+};
+
+}
diff --git a/Userland/Services/WebContent/main.cpp b/Userland/Services/WebContent/main.cpp
index b7bfccf6e4..290a34b9a2 100644
--- a/Userland/Services/WebContent/main.cpp
+++ b/Userland/Services/WebContent/main.cpp
@@ -10,8 +10,10 @@
 #include <LibIPC/SingleServer.h>
 #include <LibMain/Main.h>
 #include <LibWeb/ImageDecoding.h>
+#include <LibWeb/Loader/ResourceLoader.h>
 #include <LibWeb/WebSockets/WebSocket.h>
 #include <LibWebView/ImageDecoderClientAdapter.h>
+#include <LibWebView/RequestServerAdapter.h>
 #include <LibWebView/WebSocketClientAdapter.h>
 #include <WebContent/ConnectionFromClient.h>
 
@@ -28,6 +30,7 @@ ErrorOr<int> serenity_main(Main::Arguments)
 
     Web::ImageDecoding::Decoder::initialize(WebView::ImageDecoderClientAdapter::create());
     Web::WebSockets::WebSocketClientManager::initialize(TRY(WebView::WebSocketClientManagerAdapter::try_create()));
+    Web::ResourceLoader::initialize(TRY(WebView::RequestServerAdapter::try_create()));
 
     auto client = TRY(IPC::take_over_accepted_client_from_system_server<WebContent::ConnectionFromClient>());
     return event_loop.exec();