LibWeb: Implement 'fetch controller' struct

Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchController.h

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Forward.h>
+#include <LibJS/Heap/Cell.h>
+#include <LibJS/SafeFunction.h>
+#include <LibWeb/Fetch/Infrastructure/FetchTimingInfo.h>
+
+namespace Web::Fetch::Infrastructure {
+
+// https://fetch.spec.whatwg.org/#fetch-controller
+class FetchController : public JS::Cell {
+    JS_CELL(FetchController, JS::Cell);
+
+public:
+    enum class State {
+        Ongoing,
+        Terminated,
+        Aborted,
+    };
+
+    [[nodiscard]] static JS::NonnullGCPtr<FetchController> create(JS::VM&);
+
+    void set_full_timing_info(JS::NonnullGCPtr<FetchTimingInfo> full_timing_info) { m_full_timing_info = full_timing_info; }
+    void set_report_timing_steps(JS::SafeFunction<void(JS::Object const&)> report_timing_steps) { m_report_timing_steps = move(report_timing_steps); }
+    void set_next_manual_redirect_steps(JS::SafeFunction<void()> next_manual_redirect_steps) { m_next_manual_redirect_steps = move(next_manual_redirect_steps); }
+
+    [[nodiscard]] State state() const { return m_state; }
+
+    void report_timing(JS::Object const&) const;
+    void process_next_manual_redirect() const;
+    [[nodiscard]] JS::NonnullGCPtr<FetchTimingInfo> extract_full_timing_info() const;
+    void abort(JS::VM&, Optional<JS::Value>);
+    void terminate();
+
+private:
+    FetchController();
+
+    virtual void visit_edges(JS::Cell::Visitor&) override;
+
+    // https://fetch.spec.whatwg.org/#fetch-controller-state
+    // state (default "ongoing")
+    //    "ongoing", "terminated", or "aborted"
+    State m_state { State::Ongoing };
+
+    // https://fetch.spec.whatwg.org/#fetch-controller-full-timing-info
+    // full timing info (default null)
+    //    Null or a fetch timing info.
+    JS::GCPtr<FetchTimingInfo> m_full_timing_info;
+
+    // https://fetch.spec.whatwg.org/#fetch-controller-report-timing-steps
+    // report timing steps (default null)
+    //    Null or an algorithm accepting a global object.
+    Optional<JS::SafeFunction<void(JS::Object const&)>> m_report_timing_steps;
+
+    // https://fetch.spec.whatwg.org/#fetch-controller-report-timing-steps
+    // FIXME: serialized abort reason (default null)
+    //     Null or a Record (result of StructuredSerialize).
+
+    // https://fetch.spec.whatwg.org/#fetch-controller-next-manual-redirect-steps
+    // next manual redirect steps (default null)
+    //     Null or an algorithm accepting nothing.
+    Optional<JS::SafeFunction<void()>> m_next_manual_redirect_steps;
+};
+
+}