LibWebSocket: Switch to using Core::Stream

As LibTLS now supports the Core::Stream APIs, we can get rid of the
split paths for TCP/TLS and significantly simplify the code as well.
Provided to you free of charge by the Core::Stream-ification team :^)

Userland/Libraries/LibWebSocket/Impl/WebSocketImpl.cpp

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2021, Dex♪ <dexes.ttp@gmail.com>
+ * Copyright (c) 2022, Ali Mohammad Pur <mpfard@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWebSocket/Impl/WebSocketImpl.h>
+
+namespace WebSocket {
+
+WebSocketImpl::WebSocketImpl(Core::Object* parent)
+    : Object(parent)
+{
+}
+
+WebSocketImpl::~WebSocketImpl()
+{
+}
+
+void WebSocketImpl::connect(ConnectionInfo const& connection_info)
+{
+    VERIFY(!m_socket);
+    VERIFY(on_connected);
+    VERIFY(on_connection_error);
+    VERIFY(on_ready_to_read);
+    auto socket_result = [&]() -> ErrorOr<NonnullOwnPtr<Core::Stream::BufferedSocketBase>> {
+        if (connection_info.is_secure()) {
+            TLS::Options options;
+            options.set_alert_handler([this](auto) {
+                on_connection_error();
+            });
+            return TRY(Core::Stream::BufferedSocket<TLS::TLSv12>::create(
+                TRY(TLS::TLSv12::connect(connection_info.url().host(), connection_info.url().port_or_default(), move(options)))));
+        }
+
+        return TRY(Core::Stream::BufferedTCPSocket::create(
+            TRY(Core::Stream::TCPSocket::connect(connection_info.url().host(), connection_info.url().port_or_default()))));
+    }();
+
+    if (socket_result.is_error()) {
+        deferred_invoke([this] {
+            on_connection_error();
+        });
+        return;
+    }
+
+    m_socket = socket_result.release_value();
+
+    m_socket->on_ready_to_read = [this] {
+        on_ready_to_read();
+    };
+
+    deferred_invoke([this] {
+        on_connected();
+    });
+}
+
+ErrorOr<ByteBuffer> WebSocketImpl::read(int max_size)
+{
+    auto buffer = TRY(ByteBuffer::create_uninitialized(max_size));
+    auto nread = TRY(m_socket->read(buffer));
+    return buffer.slice(0, nread);
+}
+
+ErrorOr<String> WebSocketImpl::read_line(size_t size)
+{
+    auto buffer = TRY(ByteBuffer::create_uninitialized(size));
+    auto nread = TRY(m_socket->read_line(buffer));
+    return String::copy(buffer.span().slice(0, nread));
+}
+
+}