LibWeb: Abstract the LibProtocol WebSockets connection

Much like the ImageDecoder change, this moves the underlying connection
of the Web::WebSockets class from LibWeb to LibWebView, removing the
need for LibProtocol in LibWeb for this specific use-case.

Userland/Libraries/LibWebView/WebSocketClientAdapter.cpp

@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2022, Dex♪ <dexes.ttp@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibProtocol/WebSocket.h>
+#include <LibProtocol/WebSocketClient.h>
+#include <LibWebView/WebSocketClientAdapter.h>
+
+namespace WebView {
+
+RefPtr<WebSocketClientSocketAdapter> WebSocketClientSocketAdapter::create(NonnullRefPtr<Protocol::WebSocket> websocket)
+{
+    return adopt_ref(*new WebSocketClientSocketAdapter(move(websocket)));
+}
+
+WebSocketClientSocketAdapter::WebSocketClientSocketAdapter(NonnullRefPtr<Protocol::WebSocket> websocket)
+    : m_websocket(move(websocket))
+{
+    m_websocket->on_open = [weak_this = make_weak_ptr()] {
+        if (auto strong_this = weak_this.strong_ref())
+            if (strong_this->on_open)
+                strong_this->on_open();
+    };
+    m_websocket->on_message = [weak_this = make_weak_ptr()](auto message) {
+        if (auto strong_this = weak_this.strong_ref()) {
+            if (strong_this->on_message) {
+                strong_this->on_message(Web::WebSockets::WebSocketClientSocket::Message {
+                    .data = move(message.data),
+                    .is_text = message.is_text,
+                });
+            }
+        }
+    };
+    m_websocket->on_error = [weak_this = make_weak_ptr()](auto error) {
+        if (auto strong_this = weak_this.strong_ref()) {
+            if (strong_this->on_error) {
+                switch (error) {
+                case Protocol::WebSocket::Error::CouldNotEstablishConnection:
+                    strong_this->on_error(Web::WebSockets::WebSocketClientSocket::Error::CouldNotEstablishConnection);
+                    return;
+                case Protocol::WebSocket::Error::ConnectionUpgradeFailed:
+                    strong_this->on_error(Web::WebSockets::WebSocketClientSocket::Error::ConnectionUpgradeFailed);
+                    return;
+                case Protocol::WebSocket::Error::ServerClosedSocket:
+                    strong_this->on_error(Web::WebSockets::WebSocketClientSocket::Error::ServerClosedSocket);
+                    return;
+                }
+                VERIFY_NOT_REACHED();
+            }
+        }
+    };
+    m_websocket->on_close = [weak_this = make_weak_ptr()](u16 code, String reason, bool was_clean) {
+        if (auto strong_this = weak_this.strong_ref())
+            if (strong_this->on_close)
+                strong_this->on_close(code, move(reason), was_clean);
+    };
+    m_websocket->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 = weak_this->on_certificate_requested();
+                return Protocol::WebSocket::CertificateAndKey {
+                    .certificate = move(certificate_and_key.certificate),
+                    .key = move(certificate_and_key.key),
+                };
+            }
+        }
+        return Protocol::WebSocket::CertificateAndKey {};
+    };
+}
+
+WebSocketClientSocketAdapter::~WebSocketClientSocketAdapter() = default;
+
+Web::WebSockets::WebSocket::ReadyState WebSocketClientSocketAdapter::ready_state()
+{
+    switch (m_websocket->ready_state()) {
+    case Protocol::WebSocket::ReadyState::Connecting:
+        return Web::WebSockets::WebSocket::ReadyState::Connecting;
+    case Protocol::WebSocket::ReadyState::Open:
+        return Web::WebSockets::WebSocket::ReadyState::Open;
+    case Protocol::WebSocket::ReadyState::Closing:
+        return Web::WebSockets::WebSocket::ReadyState::Closing;
+    case Protocol::WebSocket::ReadyState::Closed:
+        return Web::WebSockets::WebSocket::ReadyState::Closed;
+    }
+    VERIFY_NOT_REACHED();
+}
+
+void WebSocketClientSocketAdapter::send(ByteBuffer binary_or_text_message, bool is_text)
+{
+    m_websocket->send(binary_or_text_message, is_text);
+}
+
+void WebSocketClientSocketAdapter::send(StringView text_message)
+{
+    m_websocket->send(text_message);
+}
+
+void WebSocketClientSocketAdapter::close(u16 code, String reason)
+{
+    m_websocket->close(code, reason);
+}
+
+ErrorOr<NonnullRefPtr<WebSocketClientManagerAdapter>> WebSocketClientManagerAdapter::try_create()
+{
+    auto websocket_client = TRY(Protocol::WebSocketClient::try_create());
+    return adopt_nonnull_ref_or_enomem(new (nothrow) WebSocketClientManagerAdapter(move(websocket_client)));
+}
+
+WebSocketClientManagerAdapter::WebSocketClientManagerAdapter(NonnullRefPtr<Protocol::WebSocketClient> websocket_client)
+    : m_websocket_client(move(websocket_client))
+{
+}
+
+WebSocketClientManagerAdapter::~WebSocketClientManagerAdapter() = default;
+
+RefPtr<Web::WebSockets::WebSocketClientSocket> WebSocketClientManagerAdapter::connect(const AK::URL& url, String const& origin)
+{
+    auto underlying_websocket = m_websocket_client->connect(url, origin);
+    if (!underlying_websocket)
+        return {};
+    return WebSocketClientSocketAdapter::create(underlying_websocket.release_nonnull());
+}
+
+}