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\"minArgs\": 0,\n \"maxArgs\": 0\n },\n \"openOptionsPage\": {\n \"minArgs\": 0,\n \"maxArgs\": 0\n },\n \"requestUpdateCheck\": {\n \"minArgs\": 0,\n \"maxArgs\": 0\n },\n \"sendMessage\": {\n \"minArgs\": 1,\n \"maxArgs\": 3\n },\n \"sendNativeMessage\": {\n \"minArgs\": 2,\n \"maxArgs\": 2\n },\n \"setUninstallURL\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n }\n },\n \"sessions\": {\n \"getDevices\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"getRecentlyClosed\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"restore\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n }\n },\n \"storage\": {\n \"local\": {\n \"clear\": {\n \"minArgs\": 0,\n \"maxArgs\": 0\n },\n \"get\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"getBytesInUse\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"remove\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"set\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n }\n },\n \"managed\": {\n \"get\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"getBytesInUse\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n }\n },\n \"sync\": {\n \"clear\": {\n \"minArgs\": 0,\n \"maxArgs\": 0\n },\n \"get\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"getBytesInUse\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"remove\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"set\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n }\n }\n },\n \"tabs\": {\n \"captureVisibleTab\": {\n \"minArgs\": 0,\n \"maxArgs\": 2\n },\n \"create\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"detectLanguage\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"discard\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"duplicate\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"executeScript\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n },\n \"get\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"getCurrent\": {\n \"minArgs\": 0,\n \"maxArgs\": 0\n },\n \"getZoom\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"getZoomSettings\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"goBack\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"goForward\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"highlight\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"insertCSS\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n },\n \"move\": {\n \"minArgs\": 2,\n \"maxArgs\": 2\n },\n \"query\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"reload\": {\n \"minArgs\": 0,\n \"maxArgs\": 2\n },\n \"remove\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"removeCSS\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n },\n \"sendMessage\": {\n \"minArgs\": 2,\n \"maxArgs\": 3\n },\n \"setZoom\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n },\n \"setZoomSettings\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n },\n \"update\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n }\n },\n \"topSites\": {\n \"get\": {\n \"minArgs\": 0,\n \"maxArgs\": 0\n }\n },\n \"webNavigation\": {\n \"getAllFrames\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"getFrame\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n }\n },\n \"webRequest\": {\n \"handlerBehaviorChanged\": {\n \"minArgs\": 0,\n \"maxArgs\": 0\n }\n },\n \"windows\": {\n \"create\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"get\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n },\n \"getAll\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"getCurrent\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"getLastFocused\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"remove\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"update\": {\n \"minArgs\": 2,\n \"maxArgs\": 2\n }\n }\n };\n\n if (Object.keys(apiMetadata).length === 0) {\n throw new Error(\"api-metadata.json has not been included in browser-polyfill\");\n }\n\n /**\n * A WeakMap subclass which creates and stores a value for any key which does\n * not exist when accessed, but behaves exactly as an ordinary WeakMap\n * otherwise.\n *\n * @param {function} createItem\n * A function which will be called in order to create the value for any\n * key which does not exist, the first time it is accessed. The\n * function receives, as its only argument, the key being created.\n */\n class DefaultWeakMap extends WeakMap {\n constructor(createItem, items = undefined) {\n super(items);\n this.createItem = createItem;\n }\n\n get(key) {\n if (!this.has(key)) {\n this.set(key, this.createItem(key));\n }\n\n return super.get(key);\n }\n }\n\n /**\n * Returns true if the given object is an object with a `then` method, and can\n * therefore be assumed to behave as a Promise.\n *\n * @param {*} value The value to test.\n * @returns {boolean} True if the value is thenable.\n */\n const isThenable = value => {\n return value && typeof value === \"object\" && typeof value.then === \"function\";\n };\n\n /**\n * Creates and returns a function which, when called, will resolve or reject\n * the given promise based on how it is called:\n *\n * - If, when called, `chrome.runtime.lastError` contains a non-null object,\n * the promise is rejected with that value.\n * - If the function is called with exactly one argument, the promise is\n * resolved to that value.\n * - Otherwise, the promise is resolved to an array containing all of the\n * function's arguments.\n *\n * @param {object} promise\n * An object containing the resolution and rejection functions of a\n * promise.\n * @param {function} promise.resolve\n * The promise's resolution function.\n * @param {function} promise.reject\n * The promise's rejection function.\n * @param {object} metadata\n * Metadata about the wrapped method which has created the callback.\n * @param {boolean} metadata.singleCallbackArg\n * Whether or not the promise is resolved with only the first\n * argument of the callback, alternatively an array of all the\n * callback arguments is resolved. By default, if the callback\n * function is invoked with only a single argument, that will be\n * resolved to the promise, while all arguments will be resolved as\n * an array if multiple are given.\n *\n * @returns {function}\n * The generated callback function.\n */\n const makeCallback = (promise, metadata) => {\n return (...callbackArgs) => {\n if (extensionAPIs.runtime.lastError) {\n promise.reject(new Error(extensionAPIs.runtime.lastError.message));\n } else if (metadata.singleCallbackArg ||\n (callbackArgs.length <= 1 && metadata.singleCallbackArg !== false)) {\n promise.resolve(callbackArgs[0]);\n } else {\n promise.resolve(callbackArgs);\n }\n };\n };\n\n const pluralizeArguments = (numArgs) => numArgs == 1 ? \"argument\" : \"arguments\";\n\n /**\n * Creates a wrapper function for a method with the given name and metadata.\n *\n * @param {string} name\n * The name of the method which is being wrapped.\n * @param {object} metadata\n * Metadata about the method being wrapped.\n * @param {integer} metadata.minArgs\n * The minimum number of arguments which must be passed to the\n * function. If called with fewer than this number of arguments, the\n * wrapper will raise an exception.\n * @param {integer} metadata.maxArgs\n * The maximum number of arguments which may be passed to the\n * function. If called with more than this number of arguments, the\n * wrapper will raise an exception.\n * @param {boolean} metadata.singleCallbackArg\n * Whether or not the promise is resolved with only the first\n * argument of the callback, alternatively an array of all the\n * callback arguments is resolved. By default, if the callback\n * function is invoked with only a single argument, that will be\n * resolved to the promise, while all arguments will be resolved as\n * an array if multiple are given.\n *\n * @returns {function(object, ...*)}\n * The generated wrapper function.\n */\n const wrapAsyncFunction = (name, metadata) => {\n return function asyncFunctionWrapper(target, ...args) {\n if (args.length < metadata.minArgs) {\n throw new Error(`Expected at least ${metadata.minArgs} ${pluralizeArguments(metadata.minArgs)} for ${name}(), got ${args.length}`);\n }\n\n if (args.length > metadata.maxArgs) {\n throw new Error(`Expected at most ${metadata.maxArgs} ${pluralizeArguments(metadata.maxArgs)} for ${name}(), got ${args.length}`);\n }\n\n return new Promise((resolve, reject) => {\n if (metadata.fallbackToNoCallback) {\n // This API method has currently no callback on Chrome, but it return a promise on Firefox,\n // and so the polyfill will try to call it with a callback first, and it will fallback\n // to not passing the callback if the first call fails.\n try {\n target[name](...args, makeCallback({resolve, reject}, metadata));\n } catch (cbError) {\n console.warn(`${name} API method doesn't seem to support the callback parameter, ` +\n \"falling back to call it without a callback: \", cbError);\n\n target[name](...args);\n\n // Update the API method metadata, so that the next API calls will not try to\n // use the unsupported callback anymore.\n metadata.fallbackToNoCallback = false;\n metadata.noCallback = true;\n\n resolve();\n }\n } else if (metadata.noCallback) {\n target[name](...args);\n resolve();\n } else {\n target[name](...args, makeCallback({resolve, reject}, metadata));\n }\n });\n };\n };\n\n /**\n * Wraps an existing method of the target object, so that calls to it are\n * intercepted by the given wrapper function. The wrapper function receives,\n * as its first argument, the original `target` object, followed by each of\n * the arguments passed to the original method.\n *\n * @param {object} target\n * The original target object that the wrapped method belongs to.\n * @param {function} method\n * The method being wrapped. This is used as the target of the Proxy\n * object which is created to wrap the method.\n * @param {function} wrapper\n * The wrapper function which is called in place of a direct invocation\n * of the wrapped method.\n *\n * @returns {Proxy<function>}\n * A Proxy object for the given method, which invokes the given wrapper\n * method in its place.\n */\n const wrapMethod = (target, method, wrapper) => {\n return new Proxy(method, {\n apply(targetMethod, thisObj, args) {\n return wrapper.call(thisObj, target, ...args);\n },\n });\n };\n\n let hasOwnProperty = Function.call.bind(Object.prototype.hasOwnProperty);\n\n /**\n * Wraps an object in a Proxy which intercepts and wraps certain methods\n * based on the given `wrappers` and `metadata` objects.\n *\n * @param {object} target\n * The target object to wrap.\n *\n * @param {object} [wrappers = {}]\n * An object tree containing wrapper functions for special cases. Any\n * function present in this object tree is called in place of the\n * method in the same location in the `target` object tree. These\n * wrapper methods are invoked as described in {@see wrapMethod}.\n *\n * @param {object} [metadata = {}]\n * An object tree containing metadata used to automatically generate\n * Promise-based wrapper functions for asynchronous. Any function in\n * the `target` object tree which has a corresponding metadata object\n * in the same location in the `metadata` tree is replaced with an\n * automatically-generated wrapper function, as described in\n * {@see wrapAsyncFunction}\n *\n * @returns {Proxy<object>}\n */\n const wrapObject = (target, wrappers = {}, metadata = {}) => {\n let cache = Object.create(null);\n let handlers = {\n has(proxyTarget, prop) {\n return prop in target || prop in cache;\n },\n\n get(proxyTarget, prop, receiver) {\n if (prop in cache) {\n return cache[prop];\n }\n\n if (!(prop in target)) {\n return undefined;\n }\n\n let value = target[prop];\n\n if (typeof value === \"function\") {\n // This is a method on the underlying object. Check if we need to do\n // any wrapping.\n\n if (typeof wrappers[prop] === \"function\") {\n // We have a special-case wrapper for this method.\n value = wrapMethod(target, target[prop], wrappers[prop]);\n } else if (hasOwnProperty(metadata, prop)) {\n // This is an async method that we have metadata for. Create a\n // Promise wrapper for it.\n let wrapper = wrapAsyncFunction(prop, metadata[prop]);\n value = wrapMethod(target, target[prop], wrapper);\n } else {\n // This is a method that we don't know or care about. Return the\n // original method, bound to the underlying object.\n value = value.bind(target);\n }\n } else if (typeof value === \"object\" && value !== null &&\n (hasOwnProperty(wrappers, prop) ||\n hasOwnProperty(metadata, prop))) {\n // This is an object that we need to do some wrapping for the children\n // of. Create a sub-object wrapper for it with the appropriate child\n // metadata.\n value = wrapObject(value, wrappers[prop], metadata[prop]);\n } else if (hasOwnProperty(metadata, \"*\")) {\n // Wrap all properties in * namespace.\n value = wrapObject(value, wrappers[prop], metadata[\"*\"]);\n } else {\n // We don't need to do any wrapping for this property,\n // so just forward all access to the underlying object.\n Object.defineProperty(cache, prop, {\n configurable: true,\n enumerable: true,\n get() {\n return target[prop];\n },\n set(value) {\n target[prop] = value;\n },\n });\n\n return value;\n }\n\n cache[prop] = value;\n return value;\n },\n\n set(proxyTarget, prop, value, receiver) {\n if (prop in cache) {\n cache[prop] = value;\n } else {\n target[prop] = value;\n }\n return true;\n },\n\n defineProperty(proxyTarget, prop, desc) {\n return Reflect.defineProperty(cache, prop, desc);\n },\n\n deleteProperty(proxyTarget, prop) {\n return Reflect.deleteProperty(cache, prop);\n },\n };\n\n // Per contract of the Proxy API, the \"get\" proxy handler must return the\n // original value of the target if that value is declared read-only and\n // non-configurable. For this reason, we create an object with the\n // prototype set to `target` instead of using `target` directly.\n // Otherwise we cannot return a custom object for APIs that\n // are declared read-only and non-configurable, such as `chrome.devtools`.\n //\n // The proxy handlers themselves will still use the original `target`\n // instead of the `proxyTarget`, so that the methods and properties are\n // dereferenced via the original targets.\n let proxyTarget = Object.create(target);\n return new Proxy(proxyTarget, handlers);\n };\n\n /**\n * Creates a set of wrapper functions for an event object, which handles\n * wrapping of listener functions that those messages are passed.\n *\n * A single wrapper is created for each listener function, and stored in a\n * map. Subsequent calls to `addListener`, `hasListener`, or `removeListener`\n * retrieve the original wrapper, so that attempts to remove a\n * previously-added listener work as expected.\n *\n * @param {DefaultWeakMap<function, function>} wrapperMap\n * A DefaultWeakMap object which will create the appropriate wrapper\n * for a given listener function when one does not exist, and retrieve\n * an existing one when it does.\n *\n * @returns {object}\n */\n const wrapEvent = wrapperMap => ({\n addListener(target, listener, ...args) {\n target.addListener(wrapperMap.get(listener), ...args);\n },\n\n hasListener(target, listener) {\n return target.hasListener(wrapperMap.get(listener));\n },\n\n removeListener(target, listener) {\n target.removeListener(wrapperMap.get(listener));\n },\n });\n\n const onRequestFinishedWrappers = new DefaultWeakMap(listener => {\n if (typeof listener !== \"function\") {\n return listener;\n }\n\n /**\n * Wraps an onRequestFinished listener function so that it will return a\n * `getContent()` property which returns a `Promise` rather than using a\n * callback API.\n *\n * @param {object} req\n * The HAR entry object representing the network request.\n */\n return function onRequestFinished(req) {\n const wrappedReq = wrapObject(req, {} /* wrappers */, {\n getContent: {\n minArgs: 0,\n maxArgs: 0,\n },\n });\n listener(wrappedReq);\n };\n });\n\n // Keep track if the deprecation warning has been logged at least once.\n let loggedSendResponseDeprecationWarning = false;\n\n const onMessageWrappers = new DefaultWeakMap(listener => {\n if (typeof listener !== \"function\") {\n return listener;\n }\n\n /**\n * Wraps a message listener function so that it may send responses based on\n * its return value, rather than by returning a sentinel value and calling a\n * callback. If the listener function returns a Promise, the response is\n * sent when the promise either resolves or rejects.\n *\n * @param {*} message\n * The message sent by the other end of the channel.\n * @param {object} sender\n * Details about the sender of the message.\n * @param {function(*)} sendResponse\n * A callback which, when called with an arbitrary argument, sends\n * that value as a response.\n * @returns {boolean}\n * True if the wrapped listener returned a Promise, which will later\n * yield a response. False otherwise.\n */\n return function onMessage(message, sender, sendResponse) {\n let didCallSendResponse = false;\n\n let wrappedSendResponse;\n let sendResponsePromise = new Promise(resolve => {\n wrappedSendResponse = function(response) {\n if (!loggedSendResponseDeprecationWarning) {\n console.warn(SEND_RESPONSE_DEPRECATION_WARNING, new Error().stack);\n loggedSendResponseDeprecationWarning = true;\n }\n didCallSendResponse = true;\n resolve(response);\n };\n });\n\n let result;\n try {\n result = listener(message, sender, wrappedSendResponse);\n } catch (err) {\n result = Promise.reject(err);\n }\n\n const isResultThenable = result !== true && isThenable(result);\n\n // If the listener didn't returned true or a Promise, or called\n // wrappedSendResponse synchronously, we can exit earlier\n // because there will be no response sent from this listener.\n if (result !== true && !isResultThenable && !didCallSendResponse) {\n return false;\n }\n\n // A small helper to send the message if the promise resolves\n // and an error if the promise rejects (a wrapped sendMessage has\n // to translate the message into a resolved promise or a rejected\n // promise).\n const sendPromisedResult = (promise) => {\n promise.then(msg => {\n // send the message value.\n sendResponse(msg);\n }, error => {\n // Send a JSON representation of the error if the rejected value\n // is an instance of error, or the object itself otherwise.\n let message;\n if (error && (error instanceof Error ||\n typeof error.message === \"string\")) {\n message = error.message;\n } else {\n message = \"An unexpected error occurred\";\n }\n\n sendResponse({\n __mozWebExtensionPolyfillReject__: true,\n message,\n });\n }).catch(err => {\n // Print an error on the console if unable to send the response.\n console.error(\"Failed to send onMessage rejected reply\", err);\n });\n };\n\n // If the listener returned a Promise, send the resolved value as a\n // result, otherwise wait the promise related to the wrappedSendResponse\n // callback to resolve and send it as a response.\n if (isResultThenable) {\n sendPromisedResult(result);\n } else {\n sendPromisedResult(sendResponsePromise);\n }\n\n // Let Chrome know that the listener is replying.\n return true;\n };\n });\n\n const wrappedSendMessageCallback = ({reject, resolve}, reply) => {\n if (extensionAPIs.runtime.lastError) {\n // Detect when none of the listeners replied to the sendMessage call and resolve\n // the promise to undefined as in Firefox.\n // See https://github.com/mozilla/webextension-polyfill/issues/130\n if (extensionAPIs.runtime.lastError.message === CHROME_SEND_MESSAGE_CALLBACK_NO_RESPONSE_MESSAGE) {\n resolve();\n } else {\n reject(new Error(extensionAPIs.runtime.lastError.message));\n }\n } else if (reply && reply.__mozWebExtensionPolyfillReject__) {\n // Convert back the JSON representation of the error into\n // an Error instance.\n reject(new Error(reply.message));\n } else {\n resolve(reply);\n }\n };\n\n const wrappedSendMessage = (name, metadata, apiNamespaceObj, ...args) => {\n if (args.length < metadata.minArgs) {\n throw new Error(`Expected at least ${metadata.minArgs} ${pluralizeArguments(metadata.minArgs)} for ${name}(), got ${args.length}`);\n }\n\n if (args.length > metadata.maxArgs) {\n throw new Error(`Expected at most ${metadata.maxArgs} ${pluralizeArguments(metadata.maxArgs)} for ${name}(), got ${args.length}`);\n }\n\n return new Promise((resolve, reject) => {\n const wrappedCb = wrappedSendMessageCallback.bind(null, {resolve, reject});\n args.push(wrappedCb);\n apiNamespaceObj.sendMessage(...args);\n });\n };\n\n const staticWrappers = {\n devtools: {\n network: {\n onRequestFinished: wrapEvent(onRequestFinishedWrappers),\n },\n },\n runtime: {\n onMessage: wrapEvent(onMessageWrappers),\n onMessageExternal: wrapEvent(onMessageWrappers),\n sendMessage: wrappedSendMessage.bind(null, \"sendMessage\", {minArgs: 1, maxArgs: 3}),\n },\n tabs: {\n sendMessage: wrappedSendMessage.bind(null, \"sendMessage\", {minArgs: 2, maxArgs: 3}),\n },\n };\n const settingMetadata = {\n clear: {minArgs: 1, maxArgs: 1},\n get: {minArgs: 1, maxArgs: 1},\n set: {minArgs: 1, maxArgs: 1},\n };\n apiMetadata.privacy = {\n network: {\"*\": settingMetadata},\n services: {\"*\": settingMetadata},\n websites: {\"*\": settingMetadata},\n };\n\n return wrapObject(extensionAPIs, staticWrappers, apiMetadata);\n };\n\n if (typeof chrome != \"object\" || !chrome || !chrome.runtime || !chrome.runtime.id) {\n throw new Error(\"This script should only be loaded in a browser extension.\");\n }\n\n // The build process adds a UMD wrapper around this file, which makes the\n // `module` variable available.\n module.exports = wrapAPIs(chrome);\n} else {\n module.exports = browser;\n}\n"],"file":"browser-polyfill.js"} |