LibWeb/Fetch: Support setting request priority from JS

Author: https://github.com/jamierocks
Commit: https://github.com/SerenityOS/serenity/commit/74d90338b1
Pull-request: https://github.com/SerenityOS/serenity/pull/24193

Userland/Libraries/LibWeb/Fetch/Enums.cpp

@@ -113,6 +113,20 @@ Infrastructure::Request::RedirectMode from_bindings_enum(Bindings::RequestRedire
     }
 }
 
+Infrastructure::Request::Priority from_bindings_enum(Bindings::RequestPriority request_priority)
+{
+    switch (request_priority) {
+    case Bindings::RequestPriority::High:
+        return Infrastructure::Request::Priority::High;
+    case Bindings::RequestPriority::Low:
+        return Infrastructure::Request::Priority::Low;
+    case Bindings::RequestPriority::Auto:
+        return Infrastructure::Request::Priority::Auto;
+    default:
+        VERIFY_NOT_REACHED();
+    }
+}
+
 Bindings::ReferrerPolicy to_bindings_enum(ReferrerPolicy::ReferrerPolicy referrer_policy)
 {
     switch (referrer_policy) {

Userland/Libraries/LibWeb/Fetch/Enums.h

@@ -18,6 +18,7 @@ namespace Web::Fetch {
 [[nodiscard]] Infrastructure::Request::CredentialsMode from_bindings_enum(Bindings::RequestCredentials);
 [[nodiscard]] Infrastructure::Request::CacheMode from_bindings_enum(Bindings::RequestCache);
 [[nodiscard]] Infrastructure::Request::RedirectMode from_bindings_enum(Bindings::RequestRedirect);
+[[nodiscard]] Infrastructure::Request::Priority from_bindings_enum(Bindings::RequestPriority);
 
 [[nodiscard]] Bindings::ReferrerPolicy to_bindings_enum(ReferrerPolicy::ReferrerPolicy);
 [[nodiscard]] Bindings::RequestDestination to_bindings_enum(Optional<Infrastructure::Request::Destination> const&);

Userland/Libraries/LibWeb/Fetch/Request.cpp

@@ -383,7 +383,9 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<Request>> Request::construct_impl(JS::Realm
     if (init.signal.has_value())
         input_signal = *init.signal;
 
-    // FIXME: 27. If init["priority"] exists, then:
+    // 27. If init["priority"] exists, then:
+    if (init.priority.has_value())
+        request->set_priority(from_bindings_enum(*init.priority));
 
     // 28. Set this’s request to request.
     // NOTE: This is done at the beginning as the 'this' value Request object

Userland/Libraries/LibWeb/Fetch/Request.h

@@ -37,6 +37,7 @@ struct RequestInit {
     Optional<bool> keepalive;
     Optional<JS::GCPtr<DOM::AbortSignal>> signal;
     Optional<Bindings::RequestDuplex> duplex;
+    Optional<Bindings::RequestPriority> priority;
     Optional<JS::Value> window;
 
     // https://infra.spec.whatwg.org/#map-is-empty
@@ -55,6 +56,7 @@ struct RequestInit {
             || keepalive.has_value()
             || signal.has_value()
             || duplex.has_value()
+            || priority.has_value()
             || window.has_value());
     }
 };

Userland/Libraries/LibWeb/Fetch/Request.idl

@@ -46,6 +46,7 @@ dictionary RequestInit {
     boolean keepalive;
     AbortSignal? signal;
     RequestDuplex duplex;
+    RequestPriority priority;
     any window; // can only be set to null
 };
 
@@ -55,6 +56,7 @@ enum RequestCredentials { "omit", "same-origin", "include" };
 enum RequestCache { "default", "no-store", "reload", "no-cache", "force-cache", "only-if-cached" };
 enum RequestRedirect { "follow", "error", "manual" };
 enum RequestDuplex { "half" };
+enum RequestPriority { "high", "low", "auto" };
 
 // https://w3c.github.io/webappsec-referrer-policy/#enumdef-referrerpolicy
 enum ReferrerPolicy {

Userland/Libraries/LibWeb/Forward.h

@@ -61,6 +61,7 @@ enum class RequestCredentials;
 enum class RequestDestination;
 enum class RequestDuplex;
 enum class RequestMode;
+enum class RequestPriority;
 enum class RequestRedirect;
 enum class ResizeObserverBoxOptions;
 enum class ResponseType;