[fetch] Implement the Response.json static method

https://bugs.webkit.org/show_bug.cgi?id=240375

Reviewed by Youenn Fablet.

This implements the `Response.json` static method, added to the fetch
spec in whatwg/fetch#1392.

* LayoutTests/imported/w3c/web-platform-tests/fetch/api/response/response-static-json.any-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/fetch/api/response/response-static-json.any.serviceworker-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/fetch/api/response/response-static-json.any.sharedworker-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/fetch/api/response/response-static-json.any.worker-expected.txt:
* Source/WebCore/Modules/fetch/FetchBody.h:
* Source/WebCore/Modules/fetch/FetchResponse.cpp:
(WebCore::FetchResponse::create):
  Added this method overload to implement the spec's "initialize a
  response" algorithm. This algortihm used to be combined with the
  regular Response creation algorithm which extracts the body, but
  Response.json cannot use that directly.
(WebCore::FetchResponse::staticJson):
* Source/WebCore/Modules/fetch/FetchResponse.h:
* Source/WebCore/Modules/fetch/FetchResponse.idl:

Canonical link: https://commits.webkit.org/261960@main

LayoutTests/imported/w3c/web-platform-tests/fetch/api/response/response-static-json.any-expected.txt

@@ -1,19 +1,15 @@
 
-FAIL Check response returned by static json() with init undefined promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"status":400} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"statusText":"foo"} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"headers":{}} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"headers":{"content-type":"foo/bar"}} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"headers":{"x-foo":"bar"}} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
+PASS Check response returned by static json() with init undefined
+PASS Check response returned by static json() with init {"status":400}
+PASS Check response returned by static json() with init {"statusText":"foo"}
+PASS Check response returned by static json() with init {"headers":{}}
+PASS Check response returned by static json() with init {"headers":{"content-type":"foo/bar"}}
+PASS Check response returned by static json() with init {"headers":{"x-foo":"bar"}}
 PASS Throws TypeError when calling static json() with a status of 204
 PASS Throws TypeError when calling static json() with a status of 205
 PASS Throws TypeError when calling static json() with a status of 304
-FAIL Check static json() encodes JSON objects correctly promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json({ foo: "bar" })', 'Response.json' is undefined)"
+PASS Check static json() encodes JSON objects correctly
 PASS Check static json() throws when data is not encodable
 PASS Check static json() throws when data is circular
-FAIL Check static json() propagates JSON serializer errors assert_throws_js: function "function () {
-      Response.json({ get foo() { throw new CustomError("bar") }});
-    }" threw object "TypeError: Response.json is not a function. (In 'Response.json({ get foo() { throw new CustomError("bar") }})', 'Response.json' is undefined)" ("TypeError") expected instance of function "class CustomError extends Error {
-    name = "CustomError";
-  }" ("CustomError")
+PASS Check static json() propagates JSON serializer errors
 

LayoutTests/imported/w3c/web-platform-tests/fetch/api/response/response-static-json.any.serviceworker-expected.txt

@@ -1,19 +1,15 @@
 
-FAIL Check response returned by static json() with init undefined promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"status":400} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"statusText":"foo"} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"headers":{}} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"headers":{"content-type":"foo/bar"}} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"headers":{"x-foo":"bar"}} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
+PASS Check response returned by static json() with init undefined
+PASS Check response returned by static json() with init {"status":400}
+PASS Check response returned by static json() with init {"statusText":"foo"}
+PASS Check response returned by static json() with init {"headers":{}}
+PASS Check response returned by static json() with init {"headers":{"content-type":"foo/bar"}}
+PASS Check response returned by static json() with init {"headers":{"x-foo":"bar"}}
 PASS Throws TypeError when calling static json() with a status of 204
 PASS Throws TypeError when calling static json() with a status of 205
 PASS Throws TypeError when calling static json() with a status of 304
-FAIL Check static json() encodes JSON objects correctly promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json({ foo: "bar" })', 'Response.json' is undefined)"
+PASS Check static json() encodes JSON objects correctly
 PASS Check static json() throws when data is not encodable
 PASS Check static json() throws when data is circular
-FAIL Check static json() propagates JSON serializer errors assert_throws_js: function "function () {
-      Response.json({ get foo() { throw new CustomError("bar") }});
-    }" threw object "TypeError: Response.json is not a function. (In 'Response.json({ get foo() { throw new CustomError("bar") }})', 'Response.json' is undefined)" ("TypeError") expected instance of function "class CustomError extends Error {
-    name = "CustomError";
-  }" ("CustomError")
+PASS Check static json() propagates JSON serializer errors
 

LayoutTests/imported/w3c/web-platform-tests/fetch/api/response/response-static-json.any.sharedworker-expected.txt

@@ -1,19 +1,15 @@
 
-FAIL Check response returned by static json() with init undefined promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"status":400} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"statusText":"foo"} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"headers":{}} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"headers":{"content-type":"foo/bar"}} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"headers":{"x-foo":"bar"}} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
+PASS Check response returned by static json() with init undefined
+PASS Check response returned by static json() with init {"status":400}
+PASS Check response returned by static json() with init {"statusText":"foo"}
+PASS Check response returned by static json() with init {"headers":{}}
+PASS Check response returned by static json() with init {"headers":{"content-type":"foo/bar"}}
+PASS Check response returned by static json() with init {"headers":{"x-foo":"bar"}}
 PASS Throws TypeError when calling static json() with a status of 204
 PASS Throws TypeError when calling static json() with a status of 205
 PASS Throws TypeError when calling static json() with a status of 304
-FAIL Check static json() encodes JSON objects correctly promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json({ foo: "bar" })', 'Response.json' is undefined)"
+PASS Check static json() encodes JSON objects correctly
 PASS Check static json() throws when data is not encodable
 PASS Check static json() throws when data is circular
-FAIL Check static json() propagates JSON serializer errors assert_throws_js: function "function () {
-      Response.json({ get foo() { throw new CustomError("bar") }});
-    }" threw object "TypeError: Response.json is not a function. (In 'Response.json({ get foo() { throw new CustomError("bar") }})', 'Response.json' is undefined)" ("TypeError") expected instance of function "class CustomError extends Error {
-    name = "CustomError";
-  }" ("CustomError")
+PASS Check static json() propagates JSON serializer errors
 

LayoutTests/imported/w3c/web-platform-tests/fetch/api/response/response-static-json.any.worker-expected.txt

@@ -1,19 +1,15 @@
 
-FAIL Check response returned by static json() with init undefined promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"status":400} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"statusText":"foo"} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"headers":{}} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"headers":{"content-type":"foo/bar"}} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
-FAIL Check response returned by static json() with init {"headers":{"x-foo":"bar"}} promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json("hello world", init)', 'Response.json' is undefined)"
+PASS Check response returned by static json() with init undefined
+PASS Check response returned by static json() with init {"status":400}
+PASS Check response returned by static json() with init {"statusText":"foo"}
+PASS Check response returned by static json() with init {"headers":{}}
+PASS Check response returned by static json() with init {"headers":{"content-type":"foo/bar"}}
+PASS Check response returned by static json() with init {"headers":{"x-foo":"bar"}}
 PASS Throws TypeError when calling static json() with a status of 204
 PASS Throws TypeError when calling static json() with a status of 205
 PASS Throws TypeError when calling static json() with a status of 304
-FAIL Check static json() encodes JSON objects correctly promise_test: Unhandled rejection with value: object "TypeError: Response.json is not a function. (In 'Response.json({ foo: "bar" })', 'Response.json' is undefined)"
+PASS Check static json() encodes JSON objects correctly
 PASS Check static json() throws when data is not encodable
 PASS Check static json() throws when data is circular
-FAIL Check static json() propagates JSON serializer errors assert_throws_js: function "function () {
-      Response.json({ get foo() { throw new CustomError("bar") }});
-    }" threw object "TypeError: Response.json is not a function. (In 'Response.json({ get foo() { throw new CustomError("bar") }})', 'Response.json' is undefined)" ("TypeError") expected instance of function "class CustomError extends Error {
-    name = "CustomError";
-  }" ("CustomError")
+PASS Check static json() propagates JSON serializer errors
 

Source/WebCore/Modules/fetch/FetchBody.h

@@ -60,6 +60,11 @@ class FetchBody {
     WEBCORE_EXPORT ~FetchBody();
     FetchBody& operator=(FetchBody&&) = default;
 
+    explicit FetchBody(String&& data)
+        : m_data(WTFMove(data))
+    {
+    }
+
     WEBCORE_EXPORT static std::optional<FetchBody> fromFormData(ScriptExecutionContext&, Ref<FormData>&&);
 
     void loadingFailed(const Exception&);
@@ -96,7 +101,6 @@ class FetchBody {
     explicit FetchBody(Ref<const ArrayBuffer>&& data) : m_data(WTFMove(data)) { }
     explicit FetchBody(Ref<const ArrayBufferView>&& data) : m_data(WTFMove(data)) { }
     explicit FetchBody(Ref<FormData>&& data) : m_data(WTFMove(data)) { }
-    explicit FetchBody(String&& data) : m_data(WTFMove(data)) { }
     explicit FetchBody(Ref<const URLSearchParams>&& data) : m_data(WTFMove(data)) { }
     explicit FetchBody(Ref<ReadableStream>&& stream) : m_data(stream) { m_readableStream = WTFMove(stream); }
     explicit FetchBody(FetchBodyConsumer&& consumer) : m_consumer(WTFMove(consumer)) { }
@@ -130,4 +134,9 @@ class FetchBody {
     RefPtr<ReadableStream> m_readableStream;
 };
 
+struct FetchBodyWithType {
+    FetchBody body;
+    String type;
+};
+
 } // namespace WebCore