WebContent: Implement ConsoleGlobalObject which proxies to WindowObject

ConsoleGlobalObject is used as the global object when running javascript
from the Browser console. This lets us implement console-only functions
and variables (like `$0`) without exposing them to webpage content. It
passes other calls over to the usual WindowObject so any code that would
have worked in the webpage will still work in the console. :^)

1 files changed, 16 insertions, 3 deletions

diff --git a/Userland/Services/WebContent/WebContentConsoleClient.cpp b/Userland/Services/WebContent/WebContentConsoleClient.cpp
index 7a3fbe6bb2..b3a9c0ef9d 100644
--- a/Userland/Services/WebContent/WebContentConsoleClient.cpp
+++ b/Userland/Services/WebContent/WebContentConsoleClient.cpp
@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2021, Brandon Scott <xeon.productions@gmail.com>
  * Copyright (c) 2020, Hunter Salyer <thefalsehonesty@gmail.com>
+ * Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -9,10 +10,22 @@
 #include <LibJS/Interpreter.h>
 #include <LibJS/MarkupGenerator.h>
 #include <LibJS/Parser.h>
-#include <LibWeb/Bindings/DOMExceptionWrapper.h>
+#include <LibWeb/Bindings/WindowObject.h>
+#include <WebContent/ConsoleGlobalObject.h>
 
 namespace WebContent {
 
+WebContentConsoleClient::WebContentConsoleClient(JS::Console& console, WeakPtr<JS::Interpreter> interpreter, ClientConnection& client)
+    : ConsoleClient(console)
+    , m_client(client)
+    , m_interpreter(interpreter)
+{
+    JS::DeferGC defer_gc(m_interpreter->heap());
+    auto console_global_object = m_interpreter->heap().allocate_without_global_object<ConsoleGlobalObject>(static_cast<Web::Bindings::WindowObject&>(m_interpreter->global_object()));
+    console_global_object->initialize_global_object();
+    m_console_global_object = JS::make_handle(console_global_object);
+}
+
 void WebContentConsoleClient::handle_input(const String& js_source)
 {
     auto parser = JS::Parser(JS::Lexer(js_source));
@@ -24,9 +37,9 @@ void WebContentConsoleClient::handle_input(const String& js_source)
         auto hint = error.source_location_hint(js_source);
         if (!hint.is_empty())
             output_html.append(String::formatted("<pre>{}</pre>", escape_html_entities(hint)));
-        m_interpreter->vm().throw_exception<JS::SyntaxError>(m_interpreter->global_object(), error.to_string());
+        m_interpreter->vm().throw_exception<JS::SyntaxError>(*m_console_global_object.cell(), error.to_string());
     } else {
-        m_interpreter->run(m_interpreter->global_object(), *program);
+        m_interpreter->run(*m_console_global_object.cell(), *program);
     }
 
     if (m_interpreter->exception()) {