Remove unused file from Chromium extension
extensions/chromium/patch-worker.js was already redundant
since edd4bae903
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/*
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Copyright 2013 Rob Wu <gwnRob@gmail.com>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Target: Chrome 20+
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// W3-compliant Worker proxy.
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// This module replaces the global Worker object.
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// When invoked, the default Worker object is called.
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// If this call fails with SECURITY_ERR, the script is fetched
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// using async XHR, and transparently proxies all calls and
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// setters/getters to the new Worker object.
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// Note: This script does not magically circumvent the Same origin policy.
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(function() {
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'use strict';
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var Worker_ = window.Worker;
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var URL = window.URL || window.webkitURL;
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// Create dummy worker for the following purposes:
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// 1. Don't override the global Worker object if the fallback isn't
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// going to work (future API changes?)
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// 2. Use it to trigger early validation of postMessage calls
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// Note: Blob constructor is supported since Chrome 20, but since
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// some of the used Chrome APIs are only supported as of Chrome 20,
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// I don't bother adding a BlobBuilder fallback.
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var dummyWorker = new Worker_(
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URL.createObjectURL(new Blob([], {type: 'text/javascript'})));
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window.Worker = function Worker(scriptURL) {
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if (arguments.length === 0) {
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throw new TypeError('Not enough arguments');
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}
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try {
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return new Worker_(scriptURL);
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} catch (e) {
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if (e.code === 18/*DOMException.SECURITY_ERR*/) {
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return new WorkerXHR(scriptURL);
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} else {
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throw e;
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}
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}
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};
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// Bind events and replay queued messages
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function bindWorker(worker, workerURL) {
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if (worker._terminated) {
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return;
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}
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worker.Worker = new Worker_(workerURL);
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worker.Worker.onerror = worker._onerror;
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worker.Worker.onmessage = worker._onmessage;
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var o;
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while ( (o = worker._replayQueue.shift()) ) {
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worker.Worker[o.method].apply(worker.Worker, o.arguments);
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}
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while ( (o = worker._messageQueue.shift()) ) {
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worker.Worker.postMessage.apply(worker.Worker, o);
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}
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}
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function WorkerXHR(scriptURL) {
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var worker = this;
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var x = new XMLHttpRequest();
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x.responseType = 'blob';
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x.onload = function() {
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// http://stackoverflow.com/a/10372280/938089
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var workerURL = URL.createObjectURL(x.response);
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bindWorker(worker, workerURL);
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};
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x.open('GET', scriptURL);
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x.send();
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worker._replayQueue = [];
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worker._messageQueue = [];
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}
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WorkerXHR.prototype = {
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constructor: Worker_,
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terminate: function() {
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if (!this._terminated) {
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this._terminated = true;
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if (this.Worker)
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this.Worker.terminate();
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}
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},
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postMessage: function(message, transfer) {
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if (!(this instanceof WorkerXHR))
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throw new TypeError('Illegal invocation');
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if (this.Worker) {
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this.Worker.postMessage.apply(this.Worker, arguments);
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} else {
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// Trigger validation:
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dummyWorker.postMessage(message);
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// Alright, push the valid message to the queue.
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this._messageQueue.push(arguments);
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}
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}
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};
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// Implement the EventTarget interface
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[
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'addEventListener',
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'removeEventListener',
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'dispatchEvent'
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].forEach(function(method) {
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WorkerXHR.prototype[method] = function() {
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if (!(this instanceof WorkerXHR)) {
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throw new TypeError('Illegal invocation');
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}
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if (this.Worker) {
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this.Worker[method].apply(this.Worker, arguments);
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} else {
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this._replayQueue.push({method: method, arguments: arguments});
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}
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};
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});
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Object.defineProperties(WorkerXHR.prototype, {
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onmessage: {
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get: function() {return this._onmessage || null;},
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set: function(func) {
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this._onmessage = typeof func === 'function' ? func : null;
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}
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},
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onerror: {
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get: function() {return this._onerror || null;},
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set: function(func) {
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this._onerror = typeof func === 'function' ? func : null;
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}
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}
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});
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})();
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