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// META: global=worker
// META: script=../resources/rs-utils.js
'use strict';
// Prior to whatwg/stream#870 it was possible to construct a ReadableStreamBYOBRequest directly. This made it possible
// to construct requests that were out-of-sync with the state of the ReadableStream. They could then be used to call
// internal operations, resulting in asserts or bad behaviour. This file contains regression tests for the change.
function getRealByteStreamController() {
let controller;
new ReadableStream({
start(c) {
controller = c;
},
type: 'bytes'
});
return controller;
}
const ReadableByteStreamController = getRealByteStreamController().constructor;
// Create an object pretending to have prototype |prototype|, of type |type|. |type| is one of "undefined", "null",
// "fake", or "real". "real" will call the realObjectCreator function to get a real instance of the object.
function createDummyObject(prototype, type, realObjectCreator) {
switch (type) {
case 'undefined':
return undefined;
case 'null':
return null;
case 'fake':
return Object.create(prototype);
case 'real':
return realObjectCreator();
}
throw new Error('not reached');
}
const dummyTypes = ['undefined', 'null', 'fake', 'real'];
function runTests(ReadableStreamBYOBRequest) {
for (const controllerType of dummyTypes) {
const controller = createDummyObject(ReadableByteStreamController.prototype, controllerType,
getRealByteStreamController);
for (const viewType of dummyTypes) {
const view = createDummyObject(Uint8Array.prototype, viewType, () => new Uint8Array(16));
test(() => {
assert_throws(new TypeError(), () => new ReadableStreamBYOBRequest(controller, view),
'constructor should throw');
}, `ReadableStreamBYOBRequest constructor should throw when passed a ${controllerType} ` +
`ReadableByteStreamController and a ${viewType} view`);
}
}
}
function getConstructorAndRunTests() {
let ReadableStreamBYOBRequest;
const rs = new ReadableStream({
pull(controller) {
const byobRequest = controller.byobRequest;
ReadableStreamBYOBRequest = byobRequest.constructor;
byobRequest.respond(4);
},
type: 'bytes'
});
rs.getReader({ mode: 'byob' }).read(new Uint8Array(8)).then(() => {
runTests(ReadableStreamBYOBRequest);
done();
});
}
// We can only get at the ReadableStreamBYOBRequest constructor asynchronously, so we need to make the test harness wait
// for us to explicitly tell it all our tests have run.
setup({ explicit_done: true });
getConstructorAndRunTests();
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