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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/280627">280627</a></dd>
<dt>Author</dt> <dd>shvaikalesh@gmail.com</dd>
<dt>Date</dt> <dd>2021-08-03 21:49:52 -0700 (Tue, 03 Aug 2021)</dd>
</dl>

<h3>Log Message</h3>
<pre>ReadableStream's pipeTo() and pipeThrough() don't properly check for AbortSignal
https://bugs.webkit.org/show_bug.cgi?id=227693

Reviewed by Sam Weinig.

LayoutTests/imported/w3c:

* web-platform-tests/streams/piping/abort.any-expected.txt:
* web-platform-tests/streams/piping/abort.any.worker-expected.txt:
* web-platform-tests/streams/piping/pipe-through.any-expected.txt:
* web-platform-tests/streams/piping/pipe-through.any.worker-expected.txt:

Source/WebCore:

This patch introduces @isAbortSignal global private function to replace `instanceof`
checks that a) were false positive for `Object.create(AbortSignal.prototype)` and
b) observably performed [[GetPrototypeOf]] and Symbol.hasInstance lookup / call.

Aligns WebKit with Blink and the spec (https://heycam.github.io/webidl/#implements).

Test: imported/w3c/web-platform-tests/streams/piping/abort.any.js

* Modules/streams/ReadableStream.js:
(pipeThrough):
(pipeTo):
* Modules/streams/ReadableStreamInternals.js:
(readableStreamPipeToWritableStream):
* bindings/js/JSDOMGlobalObject.cpp:
(WebCore::JSC_DEFINE_HOST_FUNCTION):
(WebCore::JSDOMGlobalObject::addBuiltinGlobals):
* bindings/js/WebCoreBuiltinNames.h:</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsimportedw3cChangeLog">trunk/LayoutTests/imported/w3c/ChangeLog</a></li>
<li><a href="#trunkLayoutTestsimportedw3cwebplatformtestsstreamspipingabortanyexpectedtxt">trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/abort.any-expected.txt</a></li>
<li><a href="#trunkLayoutTestsimportedw3cwebplatformtestsstreamspipingabortanyworkerexpectedtxt">trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/abort.any.worker-expected.txt</a></li>
<li><a href="#trunkLayoutTestsimportedw3cwebplatformtestsstreamspipingpipethroughanyexpectedtxt">trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/pipe-through.any-expected.txt</a></li>
<li><a href="#trunkLayoutTestsimportedw3cwebplatformtestsstreamspipingpipethroughanyworkerexpectedtxt">trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/pipe-through.any.worker-expected.txt</a></li>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreModulesstreamsReadableStreamjs">trunk/Source/WebCore/Modules/streams/ReadableStream.js</a></li>
<li><a href="#trunkSourceWebCoreModulesstreamsReadableStreamInternalsjs">trunk/Source/WebCore/Modules/streams/ReadableStreamInternals.js</a></li>
<li><a href="#trunkSourceWebCorebindingsjsJSDOMGlobalObjectcpp">trunk/Source/WebCore/bindings/js/JSDOMGlobalObject.cpp</a></li>
<li><a href="#trunkSourceWebCorebindingsjsWebCoreBuiltinNamesh">trunk/Source/WebCore/bindings/js/WebCoreBuiltinNames.h</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsimportedw3cChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/imported/w3c/ChangeLog (280626 => 280627)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/imported/w3c/ChangeLog 2021-08-04 01:37:22 UTC (rev 280626)
+++ trunk/LayoutTests/imported/w3c/ChangeLog    2021-08-04 04:49:52 UTC (rev 280627)
</span><span class="lines">@@ -1,3 +1,15 @@
</span><ins>+2021-08-03  Alexey Shvayka  <shvaikalesh@gmail.com>
+
+        ReadableStream's pipeTo() and pipeThrough() don't properly check for AbortSignal
+        https://bugs.webkit.org/show_bug.cgi?id=227693
+
+        Reviewed by Sam Weinig.
+
+        * web-platform-tests/streams/piping/abort.any-expected.txt:
+        * web-platform-tests/streams/piping/abort.any.worker-expected.txt:
+        * web-platform-tests/streams/piping/pipe-through.any-expected.txt:
+        * web-platform-tests/streams/piping/pipe-through.any.worker-expected.txt:
+
</ins><span class="cx"> 2021-08-03  Ryan Haddad  <ryanhaddad@apple.com>
</span><span class="cx"> 
</span><span class="cx">         Unreviewed, reverting r280531 and r280589.
</span></span></pre></div>
<a id="trunkLayoutTestsimportedw3cwebplatformtestsstreamspipingabortanyexpectedtxt"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/abort.any-expected.txt (280626 => 280627)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/abort.any-expected.txt  2021-08-04 01:37:22 UTC (rev 280626)
+++ trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/abort.any-expected.txt     2021-08-04 04:49:52 UTC (rev 280627)
</span><span class="lines">@@ -5,7 +5,7 @@
</span><span class="cx"> PASS a signal argument 'AbortSignal' should cause pipeTo() to reject
</span><span class="cx"> PASS a signal argument 'true' should cause pipeTo() to reject
</span><span class="cx"> PASS a signal argument '-1' should cause pipeTo() to reject
</span><del>-FAIL a signal argument '[object AbortSignal]' should cause pipeTo() to reject promise_rejects_js: pipeTo should reject function "function () { throw e }" threw "failed to abort" with type "string", not an object
</del><ins>+PASS a signal argument '[object AbortSignal]' should cause pipeTo() to reject
</ins><span class="cx"> PASS an aborted signal should cause the writable stream to reject with an AbortError
</span><span class="cx"> PASS all the AbortError objects should be the same object
</span><span class="cx"> PASS preventCancel should prevent canceling the readable
</span></span></pre></div>
<a id="trunkLayoutTestsimportedw3cwebplatformtestsstreamspipingabortanyworkerexpectedtxt"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/abort.any.worker-expected.txt (280626 => 280627)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/abort.any.worker-expected.txt   2021-08-04 01:37:22 UTC (rev 280626)
+++ trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/abort.any.worker-expected.txt      2021-08-04 04:49:52 UTC (rev 280627)
</span><span class="lines">@@ -5,7 +5,7 @@
</span><span class="cx"> PASS a signal argument 'AbortSignal' should cause pipeTo() to reject
</span><span class="cx"> PASS a signal argument 'true' should cause pipeTo() to reject
</span><span class="cx"> PASS a signal argument '-1' should cause pipeTo() to reject
</span><del>-FAIL a signal argument '[object AbortSignal]' should cause pipeTo() to reject promise_rejects_js: pipeTo should reject function "function () { throw e }" threw "failed to abort" with type "string", not an object
</del><ins>+PASS a signal argument '[object AbortSignal]' should cause pipeTo() to reject
</ins><span class="cx"> PASS an aborted signal should cause the writable stream to reject with an AbortError
</span><span class="cx"> PASS all the AbortError objects should be the same object
</span><span class="cx"> PASS preventCancel should prevent canceling the readable
</span></span></pre></div>
<a id="trunkLayoutTestsimportedw3cwebplatformtestsstreamspipingpipethroughanyexpectedtxt"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/pipe-through.any-expected.txt (280626 => 280627)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/pipe-through.any-expected.txt   2021-08-04 01:37:22 UTC (rev 280626)
+++ trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/pipe-through.any-expected.txt      2021-08-04 04:49:52 UTC (rev 280627)
</span><span class="lines">@@ -32,7 +32,7 @@
</span><span class="cx"> PASS invalid values of signal should throw; specifically 'NaN'
</span><span class="cx"> PASS invalid values of signal should throw; specifically 'true'
</span><span class="cx"> PASS invalid values of signal should throw; specifically 'AbortSignal'
</span><del>-FAIL invalid values of signal should throw; specifically '[object AbortSignal]' assert_throws_js: pipeThrough should throw function "() => rs.pipeThrough(uninterestingReadableWritablePair(), { signal })" did not throw
</del><ins>+PASS invalid values of signal should throw; specifically '[object AbortSignal]'
</ins><span class="cx"> PASS pipeThrough should accept a real AbortSignal
</span><span class="cx"> PASS pipeThrough should throw if this is locked
</span><span class="cx"> PASS pipeThrough should throw if writable is locked
</span></span></pre></div>
<a id="trunkLayoutTestsimportedw3cwebplatformtestsstreamspipingpipethroughanyworkerexpectedtxt"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/pipe-through.any.worker-expected.txt (280626 => 280627)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/pipe-through.any.worker-expected.txt    2021-08-04 01:37:22 UTC (rev 280626)
+++ trunk/LayoutTests/imported/w3c/web-platform-tests/streams/piping/pipe-through.any.worker-expected.txt       2021-08-04 04:49:52 UTC (rev 280627)
</span><span class="lines">@@ -32,7 +32,7 @@
</span><span class="cx"> PASS invalid values of signal should throw; specifically 'NaN'
</span><span class="cx"> PASS invalid values of signal should throw; specifically 'true'
</span><span class="cx"> PASS invalid values of signal should throw; specifically 'AbortSignal'
</span><del>-FAIL invalid values of signal should throw; specifically '[object AbortSignal]' assert_throws_js: pipeThrough should throw function "() => rs.pipeThrough(uninterestingReadableWritablePair(), { signal })" did not throw
</del><ins>+PASS invalid values of signal should throw; specifically '[object AbortSignal]'
</ins><span class="cx"> PASS pipeThrough should accept a real AbortSignal
</span><span class="cx"> PASS pipeThrough should throw if this is locked
</span><span class="cx"> PASS pipeThrough should throw if writable is locked
</span></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (280626 => 280627)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog   2021-08-04 01:37:22 UTC (rev 280626)
+++ trunk/Source/WebCore/ChangeLog      2021-08-04 04:49:52 UTC (rev 280627)
</span><span class="lines">@@ -1,3 +1,28 @@
</span><ins>+2021-08-03  Alexey Shvayka  <shvaikalesh@gmail.com>
+
+        ReadableStream's pipeTo() and pipeThrough() don't properly check for AbortSignal
+        https://bugs.webkit.org/show_bug.cgi?id=227693
+
+        Reviewed by Sam Weinig.
+
+        This patch introduces @isAbortSignal global private function to replace `instanceof`
+        checks that a) were false positive for `Object.create(AbortSignal.prototype)` and
+        b) observably performed [[GetPrototypeOf]] and Symbol.hasInstance lookup / call.
+
+        Aligns WebKit with Blink and the spec (https://heycam.github.io/webidl/#implements).
+
+        Test: imported/w3c/web-platform-tests/streams/piping/abort.any.js
+
+        * Modules/streams/ReadableStream.js:
+        (pipeThrough):
+        (pipeTo):
+        * Modules/streams/ReadableStreamInternals.js:
+        (readableStreamPipeToWritableStream):
+        * bindings/js/JSDOMGlobalObject.cpp:
+        (WebCore::JSC_DEFINE_HOST_FUNCTION):
+        (WebCore::JSDOMGlobalObject::addBuiltinGlobals):
+        * bindings/js/WebCoreBuiltinNames.h:
+
</ins><span class="cx"> 2021-08-03  Ryan Haddad  <ryanhaddad@apple.com>
</span><span class="cx"> 
</span><span class="cx">         Unreviewed, reverting r280531 and r280589.
</span></span></pre></div>
<a id="trunkSourceWebCoreModulesstreamsReadableStreamjs"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/Modules/streams/ReadableStream.js (280626 => 280627)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/Modules/streams/ReadableStream.js   2021-08-04 01:37:22 UTC (rev 280626)
+++ trunk/Source/WebCore/Modules/streams/ReadableStream.js      2021-08-04 04:49:52 UTC (rev 280627)
</span><span class="lines">@@ -139,7 +139,7 @@
</span><span class="cx">             preventClose = !!options["preventClose"];
</span><span class="cx"> 
</span><span class="cx">             signal = options["signal"];
</span><del>-            if (signal !== @undefined && !(signal instanceof @AbortSignal))
</del><ins>+            if (signal !== @undefined && !@isAbortSignal(signal))
</ins><span class="cx">                 throw @makeTypeError("options.signal must be AbortSignal");
</span><span class="cx">         }
</span><span class="cx"> 
</span><span class="lines">@@ -192,7 +192,7 @@
</span><span class="cx">                 return @Promise.@reject(e);
</span><span class="cx">             }
</span><span class="cx"> 
</span><del>-            if (signal !== @undefined && !(signal instanceof @AbortSignal))
</del><ins>+            if (signal !== @undefined && !@isAbortSignal(signal))
</ins><span class="cx">                 return @Promise.@reject(@makeTypeError("options.signal must be AbortSignal"));
</span><span class="cx">         }
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunkSourceWebCoreModulesstreamsReadableStreamInternalsjs"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/Modules/streams/ReadableStreamInternals.js (280626 => 280627)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/Modules/streams/ReadableStreamInternals.js  2021-08-04 01:37:22 UTC (rev 280626)
+++ trunk/Source/WebCore/Modules/streams/ReadableStreamInternals.js     2021-08-04 04:49:52 UTC (rev 280627)
</span><span class="lines">@@ -144,7 +144,7 @@
</span><span class="cx">     @assert(@isWritableStream(destination));
</span><span class="cx">     @assert(!@isReadableStreamLocked(source));
</span><span class="cx">     @assert(!@isWritableStreamLocked(destination));
</span><del>-    @assert(signal === @undefined || signal instanceof @AbortSignal);
</del><ins>+    @assert(signal === @undefined || @isAbortSignal(signal));
</ins><span class="cx"> 
</span><span class="cx">     if (@getByIdDirectPrivate(source, "underlyingByteSource") !== @undefined)
</span><span class="cx">         return @Promise.@reject("Piping of readable by strean is not supported");
</span></span></pre></div>
<a id="trunkSourceWebCorebindingsjsJSDOMGlobalObjectcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/bindings/js/JSDOMGlobalObject.cpp (280626 => 280627)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/bindings/js/JSDOMGlobalObject.cpp   2021-08-04 01:37:22 UTC (rev 280626)
+++ trunk/Source/WebCore/bindings/js/JSDOMGlobalObject.cpp      2021-08-04 04:49:52 UTC (rev 280627)
</span><span class="lines">@@ -73,6 +73,7 @@
</span><span class="cx"> JSC_DECLARE_HOST_FUNCTION(isReadableByteStreamAPIEnabled);
</span><span class="cx"> JSC_DECLARE_HOST_FUNCTION(isWritableStreamAPIEnabled);
</span><span class="cx"> JSC_DECLARE_HOST_FUNCTION(whenSignalAborted);
</span><ins>+JSC_DECLARE_HOST_FUNCTION(isAbortSignal);
</ins><span class="cx"> 
</span><span class="cx"> const ClassInfo JSDOMGlobalObject::s_info = { "DOMGlobalObject", &JSGlobalObject::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSDOMGlobalObject) };
</span><span class="cx"> 
</span><span class="lines">@@ -179,6 +180,12 @@
</span><span class="cx">     return JSValue::encode(result ? JSValue(JSC::JSValue::JSTrue) : JSValue(JSC::JSValue::JSFalse));
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+JSC_DEFINE_HOST_FUNCTION(isAbortSignal, (JSGlobalObject* globalObject, CallFrame* callFrame))
+{
+    ASSERT(callFrame->argumentCount() == 1);
+    return JSValue::encode(jsBoolean(callFrame->uncheckedArgument(0).inherits<JSAbortSignal>(globalObject->vm())));
+}
+
</ins><span class="cx"> SUPPRESS_ASAN void JSDOMGlobalObject::addBuiltinGlobals(VM& vm)
</span><span class="cx"> {
</span><span class="cx">     m_builtinInternalFunctions.initialize(*this);
</span><span class="lines">@@ -206,6 +213,7 @@
</span><span class="cx">         JSDOMGlobalObject::GlobalPropertyInfo(clientData.builtinNames().streamWritablePrivateName(), jsNumber(6), PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly),
</span><span class="cx">         JSDOMGlobalObject::GlobalPropertyInfo(clientData.builtinNames().readableByteStreamAPIEnabledPrivateName(), JSFunction::create(vm, this, 0, String(), isReadableByteStreamAPIEnabled), PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly),
</span><span class="cx">         JSDOMGlobalObject::GlobalPropertyInfo(clientData.builtinNames().writableStreamAPIEnabledPrivateName(), JSFunction::create(vm, this, 0, String(), isWritableStreamAPIEnabled), PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly),
</span><ins>+        JSDOMGlobalObject::GlobalPropertyInfo(clientData.builtinNames().isAbortSignalPrivateName(), JSFunction::create(vm, this, 1, String(), isAbortSignal), PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly),
</ins><span class="cx">     };
</span><span class="cx">     addStaticGlobals(staticGlobals, WTF_ARRAY_LENGTH(staticGlobals));
</span><span class="cx"> }
</span></span></pre></div>
<a id="trunkSourceWebCorebindingsjsWebCoreBuiltinNamesh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/bindings/js/WebCoreBuiltinNames.h (280626 => 280627)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/bindings/js/WebCoreBuiltinNames.h   2021-08-04 01:37:22 UTC (rev 280626)
+++ trunk/Source/WebCore/bindings/js/WebCoreBuiltinNames.h      2021-08-04 04:49:52 UTC (rev 280627)
</span><span class="lines">@@ -347,6 +347,7 @@
</span><span class="cx">     macro(inFlightWriteRequest) \
</span><span class="cx">     macro(indexedDB) \
</span><span class="cx">     macro(initializeWith) \
</span><ins>+    macro(isAbortSignal) \
</ins><span class="cx">     macro(isDisturbed) \
</span><span class="cx">     macro(isLoading) \
</span><span class="cx">     macro(isSecureContext) \
</span></span></pre>
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