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@@ -0,0 +1,98 @@
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+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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+From: Yoshisato Yanagisawa <[email protected]>
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+Date: Tue, 11 Apr 2023 07:12:34 +0000
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+Subject: Stop supporting { handleEvent }.
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+
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+Make the code aligned with the following specification update:
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+https://github.com/w3c/ServiceWorker/pull/1676
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+
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+With the previous specification and code, event listener vector
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+can be modified during the GetEffectiveFunction execution, which may
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+bring unexpected vector state.
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+
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+(cherry picked from commit 5105ce37a6853d52ec97894bf6969b3c29a23afd)
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+
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+Change-Id: I732c4c9ab2caebc49a7f4ef52640df7b8476d838
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+Bug: 1429201
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+Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4394402
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+Commit-Queue: Yoshisato Yanagisawa <[email protected]>
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+Reviewed-by: Kouhei Ueno <[email protected]>
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+Reviewed-by: Domenic Denicola <[email protected]>
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+Cr-Original-Commit-Position: refs/heads/main@{#1126483}
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+Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4408837
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+Reviewed-by: Shunya Shishido <[email protected]>
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+Reviewed-by: Minoru Chikamune <[email protected]>
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+Cr-Commit-Position: refs/branch-heads/5615@{#1203}
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+Cr-Branched-From: 9c6408ef696e83a9936b82bbead3d41c93c82ee4-refs/heads/main@{#1109224}
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+
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+diff --git a/content/browser/service_worker/service_worker_version_browsertest.cc b/content/browser/service_worker/service_worker_version_browsertest.cc
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+index 0435c5a1850dd3ed16197bbc40c1e276e4613a60..a9ad30764c578d1e6cf15bd114ca46e169012039 100644
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+--- a/content/browser/service_worker/service_worker_version_browsertest.cc
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++++ b/content/browser/service_worker/service_worker_version_browsertest.cc
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+@@ -988,6 +988,17 @@ IN_PROC_BROWSER_TEST_F(ServiceWorkerVersionBrowserTest,
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+ version_->fetch_handler_type());
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+ }
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+
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++IN_PROC_BROWSER_TEST_F(ServiceWorkerVersionBrowserTest,
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++ RemoveFetchEventListenersInGet) {
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++ StartServerAndNavigateToSetup();
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++ ASSERT_EQ(Install("/service_worker/fetch_event_object_removing_itself.js"),
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++ blink::ServiceWorkerStatusCode::kOk);
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++ EXPECT_EQ(ServiceWorkerVersion::FetchHandlerExistence::EXISTS,
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++ version_->fetch_handler_existence());
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++ EXPECT_EQ(ServiceWorkerVersion::FetchHandlerType::kNotSkippable,
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++ version_->fetch_handler_type());
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++}
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++
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+ // Check that fetch event handler added in the install event should result in a
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+ // service worker that doesn't count as having a fetch event handler.
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+ IN_PROC_BROWSER_TEST_F(ServiceWorkerVersionBrowserTest,
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+diff --git a/content/test/data/service_worker/fetch_event_object_removing_itself.js b/content/test/data/service_worker/fetch_event_object_removing_itself.js
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+new file mode 100644
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+index 0000000000000000000000000000000000000000..110bc4821fae3a63a374d3dc6ca954d4bd744952
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+--- /dev/null
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++++ b/content/test/data/service_worker/fetch_event_object_removing_itself.js
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+@@ -0,0 +1,19 @@
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++// Copyright 2023 The Chromium Authors
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++// Use of this source code is governed by a BSD-style license that can be
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++// found in the LICENSE file.
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++
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++let obj = {};
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++function victim() {}
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++
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++Object.defineProperty(obj, 'handleEvent', {
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++ get: () => {
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++ // Remove the victim function from the listener vector to break the loop.
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++ self.removeEventListener('fetch', victim);
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++ return () => {};
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++ },
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++ configurable: true,
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++ enumerable: true,
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++});
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++
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++self.addEventListener('fetch', obj);
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++self.addEventListener('fetch', victim);
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+diff --git a/third_party/blink/renderer/modules/service_worker/service_worker_global_scope.cc b/third_party/blink/renderer/modules/service_worker/service_worker_global_scope.cc
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+index b3a9f691a0fabf14bf6f319173f400c31c664c12..9523aa1ee53aeabe03281a34b4a290a68f6a7dc4 100644
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+--- a/third_party/blink/renderer/modules/service_worker/service_worker_global_scope.cc
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++++ b/third_party/blink/renderer/modules/service_worker/service_worker_global_scope.cc
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+@@ -2604,7 +2604,7 @@ ServiceWorkerGlobalScope::FetchHandlerType() {
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+ }
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+
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+ ScriptState* script_state = ScriptController()->GetScriptState();
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+- // Do not remove this, |scope| is needed by `GetEffectiveFunction`.
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++ // Do not remove this, |scope| is needed by `GetListenerObject`.
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+ ScriptState::Scope scope(script_state);
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+
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+ // TODO(crbug.com/1349613): revisit the way to implement this.
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+@@ -2612,8 +2612,8 @@ ServiceWorkerGlobalScope::FetchHandlerType() {
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+ for (RegisteredEventListener& e : *elv) {
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+ EventTarget* et = EventTarget::Create(script_state);
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+ v8::Local<v8::Value> v =
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+- To<JSBasedEventListener>(e.Callback())->GetEffectiveFunction(*et);
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+- if (!v->IsFunction() ||
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++ To<JSBasedEventListener>(e.Callback())->GetListenerObject(*et);
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++ if (v.IsEmpty() || !v->IsFunction() ||
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+ !v.As<v8::Function>()->Experimental_IsNopFunction()) {
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+ return mojom::blink::ServiceWorkerFetchHandlerType::kNotSkippable;
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+ }
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