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Diffstat (limited to 'tools/addon-sdk-1.3/packages/api-utils/lib/content')
4 files changed, 1799 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.3/packages/api-utils/lib/content/content-proxy.js b/tools/addon-sdk-1.3/packages/api-utils/lib/content/content-proxy.js new file mode 100644 index 0000000..ae1222f --- /dev/null +++ b/tools/addon-sdk-1.3/packages/api-utils/lib/content/content-proxy.js @@ -0,0 +1,798 @@ +const { Ci, Cc } = require("chrome"); +const xulApp = require("xul-app"); + +/** + * Access key that allows privileged code to unwrap proxy wrappers through + * valueOf: + * let xpcWrapper = proxyWrapper.valueOf(UNWRAP_ACCESS_KEY); + */ +const UNWRAP_ACCESS_KEY = {}; +exports.UNWRAP_ACCESS_KEY = UNWRAP_ACCESS_KEY; + + /** + * Returns a closure that wraps arguments before calling the given function, + * which can be given to native functions that accept a function, such that when + * the closure is called, the given function is called with wrapped arguments. + * + * @param fun {Function} + * the function for which to create a closure wrapping its arguments + * @param obj {Object} + * target object from which `fun` comes from + * (optional, for debugging purpose) + * @param name {String} + * name of the attribute from which `fun` is binded on `obj` + * (optional, for debugging purpose) + * + * Example: + * function contentScriptListener(event) {} + * let wrapper = ContentScriptFunctionWrapper(contentScriptListener); + * xray.addEventListener("...", wrapper, false); + * -> Allow to `event` to be wrapped + */ +function ContentScriptFunctionWrapper(fun, obj, name) { + if ("___proxy" in fun && typeof fun.___proxy == "function") + return fun.___proxy; + + let wrappedFun = function () { + let args = []; + for (let i = 0, l = arguments.length; i < l; i++) + args.push(wrap(arguments[i])); + + //console.log("Called from native :"+obj+"."+name); + //console.log(">args "+arguments.length); + //console.log(fun); + + // Native code can execute this callback with `this` being the wrapped + // function. For example, window.mozRequestAnimationFrame. + if (this == wrappedFun) + return fun.apply(fun, args); + + return fun.apply(wrap(this), args); + }; + + Object.defineProperty(fun, "___proxy", {value : wrappedFun, + writable : false, + enumerable : false, + configurable : false}); + + return wrappedFun; +} + +/** + * Returns a closure that unwraps arguments before calling the `fun` function, + * which can be used to build a wrapper for a native function that accepts + * wrapped arguments, since native function only accept unwrapped arguments. + * + * @param fun {Function} + * the function to wrap + * @param originalObject {Object} + * target object from which `fun` comes from + * (optional, for debugging purpose) + * @param name {String} + * name of the attribute from which `fun` is binded on `originalObject` + * (optional, for debugging purpose) + * + * Example: + * wrapper.appendChild = NativeFunctionWrapper(xray.appendChild, xray); + * wrapper.appendChild(anotherWrapper); + * -> Allow to call xray.appendChild with unwrapped version of anotherWrapper + */ +function NativeFunctionWrapper(fun, originalObject, name) { + return function () { + let args = []; + let obj = this.valueOf ? this.valueOf(UNWRAP_ACCESS_KEY) : this; + + for (let i = 0, l = arguments.length; i < l; i++) + args.push( unwrap(arguments[i], obj, name) ); + + //if (name != "toString") + //console.log(">>calling native ["+(name?name:'#closure#')+"]: \n"+fun.apply+"\n"+obj+"\n("+args.join(', ')+")\nthis :"+obj+"from:"+originalObject+"\n"); + + // Need to use Function.prototype.apply.apply because XMLHttpRequest + // is a function (typeof return 'function') and fun.apply is null :/ + let unwrapResult = Function.prototype.apply.apply(fun, [obj, args]); + let result = wrap(unwrapResult, obj, name); + + //console.log("<< "+rr+" -> "+r); + + return result; + }; +} + +/* + * Unwrap a JS value that comes from the content script. + * Mainly converts proxy wrapper to XPCNativeWrapper. + */ +function unwrap(value, obj, name) { + //console.log("unwrap : "+value+" ("+name+")"); + if (!value) + return value; + let type = typeof value; + + // In case of proxy, unwrap them recursively + // (it should not be recursive, just in case of) + if (["object", "function"].indexOf(type) !== -1 && + "__isWrappedProxy" in value) { + while("__isWrappedProxy" in value) + value = value.valueOf(UNWRAP_ACCESS_KEY); + return value; + } + + // In case of functions we need to return a wrapper that converts native + // arguments applied to this function into proxies. + if (type == "function") + return ContentScriptFunctionWrapper(value, obj, name); + + // We must wrap objects coming from content script too, as they may have + // a function that will be called by a native method. + // For example: + // addEventListener(..., { handleEvent: function(event) {} }, ...); + if (type == "object") + return ContentScriptObjectWrapper(value); + + if (["string", "number", "boolean"].indexOf(type) !== -1) + return value; + //console.log("return non-wrapped to native : "+typeof value+" -- "+value); + return value; +} + +/** + * Returns a XrayWrapper proxy object that allow to wrap any of its function + * though `ContentScriptFunctionWrapper`. These proxies are given to + * XrayWrappers in order to automatically wrap values when they call a method + * of these proxies. So that they are only used internaly and content script, + * nor web page have ever access to them. As a conclusion, we can consider + * this code as being safe regarding web pages overload. + * + * + * @param obj {Object} + * object coming from content script context to wrap + * + * Example: + * let myListener = { handleEvent: function (event) {} }; + * node.addEventListener("click", myListener, false); + * `event` has to be wrapped, so handleEvent has to be wrapped using + * `ContentScriptFunctionWrapper` function. + * In order to do so, we build this new kind of proxies. + */ +function ContentScriptObjectWrapper(obj) { + if ("___proxy" in obj && typeof obj.___proxy == "object") + return obj.___proxy; + + function valueOf(key) { + if (key === UNWRAP_ACCESS_KEY) + return obj; + return this; + } + + let proxy = Proxy.create({ + // Fundamental traps + getPropertyDescriptor: function(name) { + return Object.getOwnPropertyDescriptor(obj, name); + }, + defineProperty: function(name, desc) { + return Object.defineProperty(obj, name, desc); + }, + getOwnPropertyNames: function () { + return Object.getOwnPropertyNames(obj); + }, + delete: function(name) { + return delete obj[name]; + }, + // derived traps + has: function(name) { + return name === "__isXrayWrapperProxy" || + name in obj; + }, + hasOwn: function(name) { + return Object.prototype.hasOwnProperty.call(obj, name); + }, + get: function(receiver, name) { + if (name == "valueOf") + return valueOf; + let value = obj[name]; + if (!value) + return value; + + return unwrap(value); + }, + set: function(receiver, name, val) { + obj[name] = val; + return true; + }, + enumerate: function() { + var result = []; + for each (let name in obj) { + result.push(name); + }; + return result; + }, + keys: function() { + return Object.keys(obj); + } + }); + + Object.defineProperty(obj, "___proxy", {value : proxy, + writable : false, + enumerable : false, + configurable : false}); + + return proxy; +} + +/* + * Wrap a JS value coming from the document by building a proxy wrapper. + */ +function wrap(value, obj, name, debug) { + if (!value) + return value; + let type = typeof value; + if (type == "object") { + // We may have a XrayWrapper proxy. + // For example: + // let myListener = { handleEvent: function () {} }; + // node.addEventListener("click", myListener, false); + // When native code want to call handleEvent, + // we go though ContentScriptFunctionWrapper that calls `wrap(this)` + // `this` is the XrayWrapper proxy of myListener. + // We return this object without building a CS proxy as it is already + // a value coming from the CS. + if ("__isXrayWrapperProxy" in value) + return value.valueOf(UNWRAP_ACCESS_KEY); + + // Unwrap object before wrapping it. + // It should not happen with CS proxy objects. + while("__isWrappedProxy" in value) { + value = value.valueOf(UNWRAP_ACCESS_KEY); + } + + if (XPCNativeWrapper.unwrap(value) !== value) + return getProxyForObject(value); + // In case of Event, HTMLCollection or NodeList or ??? + // XPCNativeWrapper.unwrap(value) === value + // but it's still a XrayWrapper so let's build a proxy + return getProxyForObject(value); + } + if (type == "function") { + if (XPCNativeWrapper.unwrap(value) !== value + || (typeof value.toString === "function" && + value.toString().match(/\[native code\]/))) { + return getProxyForFunction(value, NativeFunctionWrapper(value, obj, name)); + } + return value; + } + if (type == "string") + return value; + if (type == "number") + return value; + if (type == "boolean") + return value; + //console.log("return non-wrapped to wrapped : "+value); + return value; +} + +/* + * Wrap an object from the document to a proxy wrapper + */ +function getProxyForObject(obj) { + if (typeof obj != "object") { + let msg = "tried to proxify something other than an object: " + typeof obj; + console.warn(msg); + throw msg; + } + if ("__isWrappedProxy" in obj) { + return obj; + } + // Check if there is a proxy cached on this wrapper, + // but take care of prototype ___proxy attribute inheritance! + if (obj && obj.___proxy && obj.___proxy.valueOf(UNWRAP_ACCESS_KEY) === obj) { + return obj.___proxy; + } + + let proxy = Proxy.create(handlerMaker(obj)); + + Object.defineProperty(obj, "___proxy", {value : proxy, + writable : false, + enumerable : false, + configurable : false}); + return proxy; +} + +/* + * Wrap a function from the document to a proxy wrapper + */ +function getProxyForFunction(fun, callTrap) { + if (typeof fun != "function") { + let msg = "tried to proxify something other than a function: " + typeof fun; + console.warn(msg); + throw msg; + } + if ("__isWrappedProxy" in fun) + return obj; + if ("___proxy" in fun) + return fun.___proxy; + + let proxy = Proxy.createFunction(handlerMaker(fun), callTrap); + + Object.defineProperty(fun, "___proxy", {value : proxy, + writable : false, + enumerable : false, + configurable : false}); + + return proxy; +} + +/* + * Check if a DOM attribute name is an event name. + */ +function isEventName(id) { + if (id.indexOf("on") != 0 || id.length == 2) + return false; + // Taken from: + // http://mxr.mozilla.org/mozilla-central/source/dom/base/nsDOMClassInfo.cpp#7616 + switch (id[2]) { + case 'a' : + return (id == "onabort" || + id == "onafterscriptexecute" || + id == "onafterprint"); + case 'b' : + return (id == "onbeforeunload" || + id == "onbeforescriptexecute" || + id == "onblur" || + id == "onbeforeprint"); + case 'c' : + return (id == "onchange" || + id == "onclick" || + id == "oncontextmenu" || + id == "oncopy" || + id == "oncut" || + id == "oncanplay" || + id == "oncanplaythrough"); + case 'd' : + return (id == "ondblclick" || + id == "ondrag" || + id == "ondragend" || + id == "ondragenter" || + id == "ondragleave" || + id == "ondragover" || + id == "ondragstart" || + id == "ondrop" || + id == "ondurationchange"); + case 'e' : + return (id == "onerror" || + id == "onemptied" || + id == "onended"); + case 'f' : + return id == "onfocus"; + case 'h' : + return id == "onhashchange"; + case 'i' : + return (id == "oninput" || + id == "oninvalid"); + case 'k' : + return (id == "onkeydown" || + id == "onkeypress" || + id == "onkeyup"); + case 'l' : + return (id == "onload" || + id == "onloadeddata" || + id == "onloadedmetadata" || + id == "onloadstart"); + case 'm' : + return (id == "onmousemove" || + id == "onmouseout" || + id == "onmouseover" || + id == "onmouseup" || + id == "onmousedown" || + id == "onmessage"); + case 'p' : + return (id == "onpaint" || + id == "onpageshow" || + id == "onpagehide" || + id == "onpaste" || + id == "onpopstate" || + id == "onpause" || + id == "onplay" || + id == "onplaying" || + id == "onprogress"); + case 'r' : + return (id == "onreadystatechange" || + id == "onreset" || + id == "onresize" || + id == "onratechange"); + case 's' : + return (id == "onscroll" || + id == "onselect" || + id == "onsubmit" || + id == "onseeked" || + id == "onseeking" || + id == "onstalled" || + id == "onsuspend"); + case 't': + return id == "ontimeupdate" + /* + // TODO: Make it work for mobile version + || + (nsDOMTouchEvent::PrefEnabled() && + (id == "ontouchstart" || + id == "ontouchend" || + id == "ontouchmove" || + id == "ontouchenter" || + id == "ontouchleave" || + id == "ontouchcancel"))*/; + + case 'u' : + return id == "onunload"; + case 'v': + return id == "onvolumechange"; + case 'w': + return id == "onwaiting"; + } + + return false; +} + +// XrayWrappers miss some attributes. +// Here is a list of functions that return a value when it detects a miss: +const NODES_INDEXED_BY_NAME = ["IMG", "FORM", "APPLET", "EMBED", "OBJECT"]; +const xRayWrappersMissFixes = [ + + // Fix bug with XPCNativeWrapper on HTMLCollection + // We can only access array item once, then it's undefined :o + function (obj, name) { + let i = parseInt(name); + if (obj.toString().match(/HTMLCollection|NodeList/) && + i >= 0 && i < obj.length) { + return wrap(XPCNativeWrapper(obj.wrappedJSObject[name]), obj, name); + } + return null; + }, + + // Trap access to document["form name"] + // that may refer to an existing form node + // http://mxr.mozilla.org/mozilla-central/source/dom/base/nsDOMClassInfo.cpp#9285 + function (obj, name) { + if ("nodeType" in obj && obj.nodeType == 9) { + let node = obj.wrappedJSObject[name]; + // List of supported tag: + // http://mxr.mozilla.org/mozilla-central/source/content/html/content/src/nsGenericHTMLElement.cpp#1267 + if (node && NODES_INDEXED_BY_NAME.indexOf(node.tagName) != -1) + return wrap(XPCNativeWrapper(node)); + } + return null; + }, + + // Trap access to window["frame name"] and window.frames[i] + // that refer to an (i)frame internal window object + // http://mxr.mozilla.org/mozilla-central/source/dom/base/nsDOMClassInfo.cpp#6824 + function (obj, name) { + if (typeof obj == "object" && "document" in obj) { + // Ensure that we are on a window object + try { + obj.QueryInterface(Ci.nsIDOMWindow); + } + catch(e) { + return null; + } + // Integer case: + let i = parseInt(name); + if (i >= 0 && i in obj) { + return wrap(XPCNativeWrapper(obj[i])); + } + // String name case: + if (name in obj.wrappedJSObject) { + let win = obj.wrappedJSObject[name]; + let nodes = obj.document.getElementsByName(name); + for (let i = 0, l = nodes.length; i < l; i++) { + let node = nodes[i]; + if ("contentWindow" in node && + node.contentWindow.wrappedJSObject == win) + return wrap(node.contentWindow); + } + } + } + return null; + }, + + // Trap access to form["node name"] + // http://mxr.mozilla.org/mozilla-central/source/dom/base/nsDOMClassInfo.cpp#9477 + function (obj, name) { + if (typeof obj == "object" && obj.tagName == "FORM") { + let match = obj.wrappedJSObject[name]; + let nodes = obj.ownerDocument.getElementsByName(name); + for (let i = 0, l = nodes.length; i < l; i++) { + let node = nodes[i]; + if (node.wrappedJSObject == match) + return wrap(node); + } + } + } + +]; + +if (!xulApp.versionInRange(xulApp.platformVersion, "10.0a1", "*")) { + // Fix XPathResult's constants being undefined on XrayWrappers + // these constants are defined here: + // http://mxr.mozilla.org/mozilla-central/source/dom/interfaces/xpath/nsIDOMXPathResult.idl + // and are only numbers. + // The platform bug 665279 was fixed in Gecko 10.0a1. + // FIXME: remove this workaround once the SDK no longer supports Firefox 9. + xRayWrappersMissFixes.push( + function (obj, name) { + if (typeof obj == "object" && name in Ci.nsIDOMXPathResult) { + let value = Ci.nsIDOMXPathResult[name]; + if (typeof value == "number" && value === obj.wrappedJSObject[name]) + return value; + } + } + ); +} + +// XrayWrappers have some buggy methods. +// Here is the list of them with functions returning some replacement +// for a given object `obj`: +const xRayWrappersMethodsFixes = { + // postMessage method is checking the Javascript global + // and it expects it to be a window object. + // But in our case, the global object is our sandbox global object. + // See nsGlobalWindow::CallerInnerWindow(): + // http://mxr.mozilla.org/mozilla-central/source/dom/base/nsGlobalWindow.cpp#5893 + // nsCOMPtr<nsPIDOMWindow> win = do_QueryWrappedNative(wrapper); + // win is null + postMessage: function (obj) { + // Ensure that we are on a window object + try { + obj.QueryInterface(Ci.nsIDOMWindow); + } + catch(e) { + return null; + } + // Create a wrapper that is going to call `postMessage` through `eval` + let f = function postMessage(message, targetOrigin) { + message = message.toString().replace(/'/g,"\\'"); + targetOrigin = targetOrigin.toString().replace(/'/g,"\\'"); + let jscode = "this.postMessage('" + message + "', '" + + targetOrigin + "')"; + return this.wrappedJSObject.eval(jscode); + }; + return getProxyForFunction(f, NativeFunctionWrapper(f)); + }, + + // Fix mozMatchesSelector uses that is broken on XrayWrappers + // when we use document.documentElement.mozMatchesSelector.call(node, expr) + // It's only working if we call mozMatchesSelector on the node itself. + // SEE BUG 658909: mozMatchesSelector returns incorrect results with XrayWrappers + mozMatchesSelector: function (obj) { + // Ensure that we are on an object to expose this buggy method + try { + obj.QueryInterface(Ci.nsIDOMNSElement); + } + catch(e) { + return null; + } + // We can't use `wrap` function as `f` is not a native function, + // so wrap it manually: + let f = function mozMatchesSelector(selectors) { + return this.mozMatchesSelector(selectors); + }; + + return getProxyForFunction(f, NativeFunctionWrapper(f)); + }, + + // Bug 679054: History API doesn't work with Proxy objects. + // We have to pass regular JS objects on `pushState` and replaceState methods. + pushState: function (obj) { + // Ensure that we are on an object that expose History API + try { + obj.QueryInterface(Ci.nsIDOMHistory); + } + catch(e) { + return null; + } + let f = function fix() { + // Call native method with JSON objects + // (need to convert `arguments` to an array via `slice`) + return this.pushState.apply(this, JSON.parse(JSON.stringify(Array.slice(arguments)))); + }; + + return getProxyForFunction(f, NativeFunctionWrapper(f)); + }, + replaceState: function (obj) { + // Ensure that we are on an object that expose History API + try { + obj.QueryInterface(Ci.nsIDOMHistory); + } + catch(e) { + return null; + } + let f = function fix() { + // Call native method with JSON objects + // (need to convert `arguments` to an array via `slice`) + return this.replaceState.apply(this, JSON.parse(JSON.stringify(Array.slice(arguments)))); + }; + + return getProxyForFunction(f, NativeFunctionWrapper(f)); + } +}; + +/* + * Generate handler for proxy wrapper + */ +function handlerMaker(obj) { + // Overloaded attributes dictionary + let overload = {}; + // Expando attributes dictionary (i.e. onclick, onfocus, on* ...) + let expando = {}; + // Cache of methods overloaded to fix XrayWrapper bug + let methodFixes = {}; + return { + // Fundamental traps + getPropertyDescriptor: function(name) { + return Object.getOwnPropertyDescriptor(obj, name); + }, + defineProperty: function(name, desc) { + return Object.defineProperty(obj, name, desc); + }, + getOwnPropertyNames: function () { + return Object.getOwnPropertyNames(obj); + }, + delete: function(name) { + delete expando[name]; + delete overload[name]; + return delete obj[name]; + }, + + // derived traps + has: function(name) { + if (name == "___proxy") return false; + if (isEventName(name)) { + // XrayWrappers throw exception when we try to access expando attributes + // even on "name in wrapper". So avoid doing it! + return name in expando; + } + return name in obj || name in overload || name == "__isWrappedProxy"; + }, + hasOwn: function(name) { + return Object.prototype.hasOwnProperty.call(obj, name); + }, + get: function(receiver, name) { + + if (name == "___proxy") + return undefined; + + // Overload toString in order to avoid returning "[XrayWrapper [object HTMLElement]]" + // or "[object Function]" for function's Proxy + if (name == "toString") + return wrap(obj.wrappedJSObject ? obj.wrappedJSObject.toString + : obj.toString, + obj, name); + + // Offer a way to retrieve XrayWrapper from a proxified node through `valueOf` + if (name == "valueOf") + return function (key) { + if (key === UNWRAP_ACCESS_KEY) + return obj; + return this; + }; + + // Return overloaded value if there is one. + // It allows to overload native methods like addEventListener that + // are not saved, even on the wrapper itself. + // (And avoid some methods like toSource from being returned here! [__proto__ test]) + if (name in overload && + overload[name] != Object.getPrototypeOf(overload)[name] && + name != "__proto__") { + return overload[name]; + } + + // Catch exceptions thrown by XrayWrappers when we try to access on* + // attributes like onclick, onfocus, ... + if (isEventName(name)) { + //console.log("expando:"+obj+" - "+obj.nodeType); + return name in expando ? expando[name].original : undefined; + } + + // Overload some XrayWrappers method in order to fix its bugs + if (name in methodFixes && + methodFixes[name] != Object.getPrototypeOf(methodFixes)[name] && + name != "__proto__") + return methodFixes[name]; + if (Object.keys(xRayWrappersMethodsFixes).indexOf(name) !== -1) { + let fix = xRayWrappersMethodsFixes[name](obj); + if (fix) + return methodFixes[name] = fix; + } + + let o = obj[name]; + + // XrayWrapper miss some attributes, try to catch these and return a value + if (!o) { + for each(let atttributeFixer in xRayWrappersMissFixes) { + let fix = atttributeFixer(obj, name); + if (fix) + return fix; + } + } + + // Generic case + return wrap(o, obj, name); + + }, + + set: function(receiver, name, val) { + + if (isEventName(name)) { + //console.log("SET on* attribute : " + name + " / " + val + "/" + obj); + let shortName = name.replace(/^on/,""); + + // Unregister previously set listener + if (expando[name]) { + obj.removeEventListener(shortName, expando[name], true); + delete expando[name]; + } + + // Only accept functions + if (typeof val != "function") + return false; + + // Register a new listener + let original = val; + val = ContentScriptFunctionWrapper(val); + expando[name] = val; + val.original = original; + obj.addEventListener(name.replace(/^on/, ""), val, true); + return true; + } + + obj[name] = val; + + // Handle native method not overloaded on XrayWrappers: + // obj.addEventListener = val; -> obj.addEventlistener = native method + // And, XPCNativeWrapper bug where nested values appear to be wrapped: + // obj.customNestedAttribute = val -> obj.customNestedAttribute !== val + // obj.customNestedAttribute = "waive wrapper something" + // SEE BUG 658560: Fix identity problem with CrossOriginWrappers + // TODO: check that DOM can't be updated by the document itself and so overloaded value becomes wrong + // but I think such behavior is limited to primitive type + if ((typeof val == "function" || typeof val == "object") && name) { + overload[name] = val; + } + + return true; + }, + + enumerate: function() { + var result = []; + for each (name in Object.keys(obj)) { + result.push(name); + }; + return result; + }, + + keys: function() { + return Object.keys(obj); + } + }; +}; + + +/* + * Wrap an object from the document to a proxy wrapper. + */ +exports.create = function create(object) { + // We accept either a XrayWrapper or an unwrapped reference + if ("wrappedJSObject" in object) + object = object.wrappedJSObject; + + let xpcWrapper = XPCNativeWrapper(object); + + // If we can't build an XPCNativeWrapper, it doesn't make sense to build + // a proxy. All proxy code is based on having such wrapper that store + // different JS attributes set. + // (we can't build XPCNativeWrapper when object is from the same + // principal/domain) + if (object === xpcWrapper) { + return object; + } + return getProxyForObject(xpcWrapper); +} diff --git a/tools/addon-sdk-1.3/packages/api-utils/lib/content/loader.js b/tools/addon-sdk-1.3/packages/api-utils/lib/content/loader.js new file mode 100644 index 0000000..25bc651 --- /dev/null +++ b/tools/addon-sdk-1.3/packages/api-utils/lib/content/loader.js @@ -0,0 +1,203 @@ +/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim:set ts=2 sw=2 sts=2 et: */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is Jetpack. + * + * The Initial Developer of the Original Code is + * the Mozilla Foundation. + * Portions created by the Initial Developer are Copyright (C) 2010 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * Irakli Gozalishvili <gozala@mozilla.com> (Original Author) + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +"use strict"; + +const { EventEmitter } = require('../events'); +const { validateOptions, getTypeOf } = require('../api-utils'); +const { URL, toFilename } = require('../url'); +const file = require('../file'); + +// map of property validations +const valid = { + contentURL: { + ok: function (value) { + try { + URL(value); + } + catch(e) { + return false; + } + return true; + }, + msg: 'The `contentURL` option must be a valid URL.' + }, + contentScriptFile: { + is: ['undefined', 'null', 'string', 'array'], + map: function(value) 'undefined' === getTypeOf(value) ? null : value, + ok: function(value) { + if (getTypeOf(value) === 'array') { + // Make sure every item is a local file URL. + return value.every(function (item) { + try { + toFilename(item); + return true; + } + catch(e) { + return false; + } + }); + } + return true; + }, + msg: 'The `contentScriptFile` option must be a local file URL or an array of' + + 'URLs.' + }, + contentScript: { + is: ['undefined', 'null', 'string', 'array'], + map: function(value) 'undefined' === getTypeOf(value) ? null : value, + ok: function(value) 'array' !== getTypeOf(value) ? true : + value.every(function(item) 'string' === getTypeOf(item)) + , + msg: 'The script option must be a string or an array of strings.' + }, + contentScriptWhen: { + is: ['string'], + ok: function(value) ['start', 'ready', 'end'].indexOf(value) >= 0, + map: function(value) { + return value || 'end'; + }, + msg: 'The `contentScriptWhen` option must be either "start", "ready" or "end".' + } +}; +exports.validationAttributes = valid; + +/** + * Shortcut function to validate property with validation. + * @param {Object|Number|String} suspect + * value to validate + * @param {Object} validation + * validation rule passed to `api-utils` + */ +function validate(suspect, validation) validateOptions( + { $: suspect }, + { $: validation } +).$ + +function Allow(script) ({ + get script() script, + set script(value) script = !!value +}) + +/** + * Trait is intended to be used in some composition. It provides set of core + * properties and bounded validations to them. Trait is useful for all the + * compositions providing high level APIs for interaction with content. + * Property changes emit `"propertyChange"` events on instances. + */ +const Loader = EventEmitter.compose({ + /** + * Permissions for the content, with the following keys: + * @property {Object} [allow = { script: true }] + * @property {Boolean} [allow.script = true] + * Whether or not to execute script in the content. Defaults to true. + */ + get allow() this._allow || (this._allow = Allow(true)), + set allow(value) this.allow.script = value && value.script, + _allow: null, + /** + * The content to load. Either a string of HTML or a URL. + * @type {String} + */ + get contentURL() this._contentURL, + set contentURL(value) { + value = validate(value, valid.contentURL); + if (this._contentURL != value) { + this._emit('propertyChange', { + contentURL: this._contentURL = value + }); + } + }, + _contentURL: null, + /** + * When to load the content scripts. + * Possible values are "end" (default), which loads them once all page + * contents have been loaded, "ready", which loads them once DOM nodes are + * ready (ie like DOMContentLoaded event), and "start", which loads them once + * the `window` object for the page has been created, but before any scripts + * specified by the page have been loaded. + * Property change emits `propertyChange` event on instance with this key + * and new value. + * @type {'start'|'ready'|'end'} + */ + get contentScriptWhen() this._contentScriptWhen, + set contentScriptWhen(value) { + value = validate(value, valid.contentScriptWhen); + if (value !== this._contentScriptWhen) { + this._emit('propertyChange', { + contentScriptWhen: this._contentScriptWhen = value + }); + } + }, + _contentScriptWhen: 'end', + /** + * The URLs of content scripts. + * Property change emits `propertyChange` event on instance with this key + * and new value. + * @type {String[]} + */ + get contentScriptFile() this._contentScriptFile, + set contentScriptFile(value) { + value = validate(value, valid.contentScriptFile); + if (value != this._contentScriptFile) { + this._emit('propertyChange', { + contentScriptFile: this._contentScriptFile = value + }); + } + }, + _contentScriptFile: null, + /** + * The texts of content script. + * Property change emits `propertyChange` event on instance with this key + * and new value. + * @type {String|undefined} + */ + get contentScript() this._contentScript, + set contentScript(value) { + value = validate(value, valid.contentScript); + if (value != this._contentScript) { + this._emit('propertyChange', { + contentScript: this._contentScript = value + }); + } + }, + _contentScript: null +}); +exports.Loader = Loader; + diff --git a/tools/addon-sdk-1.3/packages/api-utils/lib/content/symbiont.js b/tools/addon-sdk-1.3/packages/api-utils/lib/content/symbiont.js new file mode 100644 index 0000000..25d80a1 --- /dev/null +++ b/tools/addon-sdk-1.3/packages/api-utils/lib/content/symbiont.js @@ -0,0 +1,201 @@ +/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim:set ts=2 sw=2 sts=2 et: */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is Jetpack. + * + * The Initial Developer of the Original Code is + * the Mozilla Foundation. + * Portions created by the Initial Developer are Copyright (C) 2010 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * Myk Melez <myk@mozilla.org> (Original Author) + * Irakli Gozalishvili <gozala@mozilla.com> + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ +"use strict"; + +const { Worker } = require('./worker'); +const { Loader } = require('./loader'); +const hiddenFrames = require('../hidden-frame'); +const observers = require('../observer-service'); +const unload = require('../unload'); + +/** + * This trait is layered on top of `Worker` and in contrast to symbiont + * Worker constructor requires `content` option that represents content + * that will be loaded in the provided frame, if frame is not provided + * Worker will create hidden one. + */ +const Symbiont = Worker.resolve({ + constructor: '_initWorker', + destroy: '_workerDestroy' + }).compose(Loader, { + + /** + * The constructor requires all the options that are required by + * `require('content').Worker` with the difference that the `frame` option + * is optional. If `frame` is not provided, `contentURL` is expected. + * @param {Object} options + * @param {String} options.contentURL + * URL of a content to load into `this._frame` and create worker for. + * @param {Element} [options.frame] + * iframe element that is used to load `options.contentURL` into. + * if frame is not provided hidden iframe will be created. + */ + constructor: function Symbiont(options) { + options = options || {}; + + if ('contentURL' in options) + this.contentURL = options.contentURL; + if ('contentScriptWhen' in options) + this.contentScriptWhen = options.contentScriptWhen; + if ('contentScriptFile' in options) + this.contentScriptFile = options.contentScriptFile; + if ('contentScript' in options) + this.contentScript = options.contentScript; + if ('allow' in options) + this.allow = options.allow; + if ('onError' in options) + this.on('error', options.onError); + if ('onMessage' in options) + this.on('message', options.onMessage); + if ('frame' in options) { + this._initFrame(options.frame); + } + else { + let self = this; + this._hiddenFrame = hiddenFrames.HiddenFrame({ + onReady: function onFrame() { + self._initFrame(this.element); + } + }); + hiddenFrames.add(this._hiddenFrame); + } + + unload.ensure(this._public, "destroy"); + }, + + destroy: function destroy() { + this._workerDestroy(); + this._unregisterListener(); + this._frame = null; + if (this._hiddenFrame) { + hiddenFrames.remove(this._hiddenFrame); + this._hiddenFrame = null; + } + }, + + /** + * XUL iframe or browser elements with attribute `type` being `content`. + * Used to create `ContentSymbiont` from. + * @type {nsIFrame|nsIBrowser} + */ + _frame: null, + + /** + * Listener to the `'frameReady"` event (emitted when `iframe` is ready). + * Removes listener, sets right permissions to the frame and loads content. + */ + _initFrame: function _initFrame(frame) { + if (this._loadListener) + this._unregisterListener(); + + this._frame = frame; + frame.docShell.allowJavascript = this.allow.script; + frame.setAttribute("src", this._contentURL); + + if ((frame.contentDocument.readyState == "complete" || + (frame.contentDocument.readyState == "interactive" && + this.contentScriptWhen != 'end' )) && + frame.contentDocument.location == this._contentURL) { + // In some cases src doesn't change and document is already ready + // (for ex: when the user moves a widget while customizing toolbars.) + this._onInit(); + return; + } + + let self = this; + + if ('start' == this.contentScriptWhen) { + this._loadEvent = 'start'; + observers.add('document-element-inserted', + this._loadListener = function onStart(doc) { + + let window = doc.defaultView; + if (window && window == frame.contentWindow) { + self._unregisterListener(); + self._onInit(); + } + + }); + return; + } + + let eventName = 'end' == this.contentScriptWhen ? 'load' : 'DOMContentLoaded'; + let self = this; + this._loadEvent = eventName; + frame.addEventListener(eventName, + this._loadListener = function _onReady(event) { + + if (event.target != frame.contentDocument) + return; + self._unregisterListener(); + + self._onInit(); + + }, true); + + }, + + /** + * Unregister listener that watchs for document being ready to be injected. + * This listener is registered in `Symbiont._initFrame`. + */ + _unregisterListener: function _unregisterListener() { + if (!this._loadListener) + return; + if (this._loadEvent == "start") { + observers.remove('document-element-inserted', this._loadListener); + } + else { + this._frame.removeEventListener(this._loadEvent, this._loadListener, + true); + } + this._loadListener = null; + }, + + /** + * Called by Symbiont itself when the frame is ready to load + * content scripts according to contentScriptWhen. Overloaded by Panel. + */ + _onInit: function () { + this._initWorker({ window: this._frame.contentWindow }); + } + +}); +exports.Symbiont = Symbiont; diff --git a/tools/addon-sdk-1.3/packages/api-utils/lib/content/worker.js b/tools/addon-sdk-1.3/packages/api-utils/lib/content/worker.js new file mode 100644 index 0000000..e3126b6 --- /dev/null +++ b/tools/addon-sdk-1.3/packages/api-utils/lib/content/worker.js @@ -0,0 +1,597 @@ +/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim:set ts=2 sw=2 sts=2 et: */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is Jetpack. + * + * The Initial Developer of the Original Code is + * the Mozilla Foundation. + * Portions created by the Initial Developer are Copyright (C) 2010 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * Irakli Gozalishvili <gozala@mozilla.com> + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ +"use strict"; + +const { shims } = require('../cuddlefish'); +const { Trait } = require('../traits'); +const { EventEmitter, EventEmitterTrait } = require('../events'); +const { Ci, Cu, Cc } = require('chrome'); +const timer = require('../timer'); +const { toFilename } = require('../url'); +const file = require('../file'); +const unload = require('../unload'); +const observers = require('../observer-service'); +const { Cortex } = require('../cortex'); +const { Enqueued } = require('../utils/function'); +const proxy = require('./content-proxy'); + +const JS_VERSION = '1.8'; + +const ERR_DESTROYED = + "The page has been destroyed and can no longer be used."; + + +function ensureArgumentsAreJSON(args) { + // First convert to real array + let array = Array.prototype.slice.call(args); + // JSON.stringify is buggy with cross-sandbox values, + // it may return "{}" on functions. Use a replacer to match them correctly. + function replacer(k, v) { + return typeof v === "function" ? undefined : v; + } + return JSON.parse(JSON.stringify(array, replacer)); +} + +/** + * Extended `EventEmitter` allowing us to emit events asynchronously. + */ +const AsyncEventEmitter = EventEmitter.compose({ + /** + * Emits event in the next turn of event loop. + */ + _asyncEmit: function _asyncEmit() { + timer.setTimeout(function emitter(emit, scope, params) { + emit.apply(scope, params); + }, 0, this._emit, this, arguments) + } +}); + +/** + * Local trait providing implementation of the workers global scope. + * Used to configure global object in the sandbox. + * @see http://www.w3.org/TR/workers/#workerglobalscope + */ +const WorkerGlobalScope = AsyncEventEmitter.compose({ + on: Trait.required, + _removeAllListeners: Trait.required, + + // wrapped functions from `'timer'` module. + // Wrapper adds `try catch` blocks to the callbacks in order to + // emit `error` event on a symbiont if exception is thrown in + // the Worker global scope. + // @see http://www.w3.org/TR/workers/#workerutils + + // List of all living timeouts/intervals + _timers: null, + + setTimeout: function setTimeout(callback, delay) { + let params = Array.slice(arguments, 2); + let id = timer.setTimeout(function(self) { + try { + delete self._timers[id]; + callback.apply(null, params); + } catch(e) { + self._addonWorker._asyncEmit('error', e); + } + }, delay, this); + this._timers[id] = true; + return id; + }, + clearTimeout: function clearTimeout(id){ + delete this._timers[id]; + return timer.clearTimeout(id); + }, + + setInterval: function setInterval(callback, delay) { + let params = Array.slice(arguments, 2); + let id = timer.setInterval(function(self) { + try { + callback.apply(null, params); + } catch(e) { + self._addonWorker._asyncEmit('error', e); + } + }, delay, this); + this._timers[id] = true; + return id; + }, + clearInterval: function clearInterval(id) { + delete this._timers[id]; + return timer.clearInterval(id); + }, + + /** + * `onMessage` function defined in the global scope of the worker context. + */ + get _onMessage() this.__onMessage, + set _onMessage(value) { + let listener = this.__onMessage; + if (listener && value !== listener) { + this.removeListener('message', listener); + this.__onMessage = undefined; + } + if (value) + this.on('message', this.__onMessage = value); + }, + __onMessage: undefined, + + /** + * Function for sending data to the addon side. + * Validates that data is a `JSON` or primitive value and emits + * 'message' event on the worker in the next turn of the event loop. + * _Later this will be sending data across process boundaries._ + * @param {JSON|String|Number|Boolean} data + */ + postMessage: function postMessage(data) { + if (!this._addonWorker) + throw new Error(ERR_DESTROYED); + this._addonWorker._asyncEmit('message', + JSON.parse(JSON.stringify(data))); + }, + + /** + * EventEmitter, that behaves (calls listeners) asynchronously. + * A way to send customized messages to / from the worker. + * Events from in the worker can be observed / emitted via self.on / self.emit + */ + get port() this._port._public, + + /** + * Same object than this.port but private API. + * Allow access to _asyncEmit, in order to send event to port. + */ + _port: null, + + /** + * Alias to the global scope in the context of worker. Similar to + * `window` concept. + */ + get self() this._public, + + /** + * Configures sandbox and loads content scripts into it. + * @param {Worker} worker + * content worker + */ + constructor: function WorkerGlobalScope(worker) { + this._addonWorker = worker; + + // Hack in order to allow addon worker to access _asyncEmit + // as this is the private object of WorkerGlobalScope + worker._contentWorker = this; + + // create an event emitter that receive and send events from/to the addon + let contentWorker = this; + this._port = EventEmitterTrait.create({ + emit: function () { + let addonWorker = contentWorker._addonWorker; + if (!addonWorker) + throw new Error(ERR_DESTROYED); + addonWorker._onContentScriptEvent.apply(addonWorker, arguments); + } + }); + // create emit that executes in next turn of event loop. + this._port._asyncEmit = Enqueued(this._port._emit); + // expose wrapped port, that exposes only public properties. + this._port._public = Cortex(this._port); + + // We receive an unwrapped window, with raw js access + let window = worker._window; + + // Create the sandbox and bind it to window in order for content scripts to + // have access to all standard globals (window, document, ...) + let sandbox = this._sandbox = new Cu.Sandbox(window, { + sandboxPrototype: proxy.create(window), + wantXrays: false + }); + Object.defineProperties(sandbox, { + window: { get: function() sandbox }, + top: { get: function() sandbox }, + // Use the Greasemonkey naming convention to provide access to the + // unwrapped window object so the content script can access document + // JavaScript values. + // NOTE: this functionality is experimental and may change or go away + // at any time! + unsafeWindow: { get: function () window.wrappedJSObject } + }); + + // Overriding / Injecting some natives into sandbox. + Cu.evalInSandbox(shims.contents, sandbox, JS_VERSION, shims.filename); + + // Initialize timer lists + this._timers = {}; + + let publicAPI = this._public; + + // List of content script globals: + let keys = ['setTimeout', 'clearTimeout', 'setInterval', 'clearInterval', + 'self']; + for each (let key in keys) { + Object.defineProperty( + sandbox, key, Object.getOwnPropertyDescriptor(publicAPI, key) + ); + } + let self = this; + Object.defineProperties(sandbox, { + onMessage: { + get: function() self._onMessage, + set: function(value) { + console.warn("The global `onMessage` function in content scripts " + + "is deprecated in favor of the `self.on()` function. " + + "Replace `onMessage = function (data){}` definitions " + + "with calls to `self.on('message', function (data){})`. " + + "For more info on `self.on`, see " + + "<https://addons.mozilla.org/en-US/developers/docs/sdk/latest/dev-guide/addon-development/web-content.html>."); + self._onMessage = value; + }, + configurable: true + }, + console: { value: console, configurable: true }, + + // Deprecated use of on/postMessage from globals + on: { + value: function () { + console.warn("The global `on()` function in content scripts is " + + "deprecated in favor of the `self.on()` function, " + + "which works the same. Replace calls to `on()` with " + + "calls to `self.on()`" + + "For more info on `self.on`, see " + + "<https://addons.mozilla.org/en-US/developers/docs/sdk/latest/dev-guide/addon-development/web-content.html>."); + publicAPI.on.apply(publicAPI, arguments); + }, + configurable: true + }, + postMessage: { + value: function () { + console.warn("The global `postMessage()` function in content " + + "scripts is deprecated in favor of the " + + "`self.postMessage()` function, which works the same. " + + "Replace calls to `postMessage()` with calls to " + + "`self.postMessage()`." + + "For more info on `self.on`, see " + + "<https://addons.mozilla.org/en-US/developers/docs/sdk/latest/dev-guide/addon-development/web-content.html>."); + publicAPI.postMessage.apply(publicAPI, arguments); + }, + configurable: true + } + }); + + // The order of `contentScriptFile` and `contentScript` evaluation is + // intentional, so programs can load libraries like jQuery from script URLs + // and use them in scripts. + let contentScriptFile = ('contentScriptFile' in worker) ? worker.contentScriptFile + : null, + contentScript = ('contentScript' in worker) ? worker.contentScript : null; + + if (contentScriptFile) { + if (Array.isArray(contentScriptFile)) + this._importScripts.apply(this, contentScriptFile); + else + this._importScripts(contentScriptFile); + } + if (contentScript) { + this._evaluate( + Array.isArray(contentScript) ? contentScript.join(';\n') : contentScript + ); + } + }, + _destructor: function _destructor() { + this._removeAllListeners(); + // Unregister all setTimeout/setInterval + // We can use `clearTimeout` for both setTimeout/setInterval + // as internal implementation of timer module use same method for both. + for (let id in this._timers) + timer.clearTimeout(id); + let publicAPI = this._public, + sandbox = this._sandbox; + delete sandbox.__proto__; + for (let key in publicAPI) + delete sandbox[key]; + this._sandbox = null; + this._addonWorker = null; + this.__onMessage = undefined; + }, + + /** + * JavaScript sandbox where all the content scripts are evaluated. + * {Sandbox} + */ + _sandbox: null, + + /** + * Reference to the addon side of the worker. + * @type {Worker} + */ + _addonWorker: null, + + /** + * Evaluates code in the sandbox. + * @param {String} code + * JavaScript source to evaluate. + * @param {String} [filename='javascript:' + code] + * Name of the file + */ + _evaluate: function(code, filename) { + filename = filename || 'javascript:' + code; + try { + Cu.evalInSandbox(code, this._sandbox, JS_VERSION, filename, 1); + } + catch(e) { + this._addonWorker._asyncEmit('error', e); + } + }, + /** + * Imports scripts to the sandbox by reading files under urls and + * evaluating its source. If exception occurs during evaluation + * `"error"` event is emitted on the worker. + * This is actually an analog to the `importScript` method in web + * workers but in our case it's not exposed even though content + * scripts may be able to do it synchronously since IO operation + * takes place in the UI process. + */ + _importScripts: function _importScripts(url) { + let urls = Array.slice(arguments, 0); + for each (let contentScriptFile in urls) { + try { + let filename = toFilename(contentScriptFile); + this._evaluate(file.read(filename), filename); + } + catch(e) { + this._addonWorker._asyncEmit('error', e) + } + } + } +}); + +/** + * Message-passing facility for communication between code running + * in the content and add-on process. + * @see https://jetpack.mozillalabs.com/sdk/latest/docs/#module/api-utils/content/worker + */ +const Worker = AsyncEventEmitter.compose({ + on: Trait.required, + _asyncEmit: Trait.required, + _removeAllListeners: Trait.required, + + /** + * Sends a message to the worker's global scope. Method takes single + * argument, which represents data to be sent to the worker. The data may + * be any primitive type value or `JSON`. Call of this method asynchronously + * emits `message` event with data value in the global scope of this + * symbiont. + * + * `message` event listeners can be set either by calling + * `self.on` with a first argument string `"message"` or by + * implementing `onMessage` function in the global scope of this worker. + * @param {Number|String|JSON} data + */ + postMessage: function postMessage(data) { + if (!this._contentWorker) + throw new Error(ERR_DESTROYED); + this._contentWorker._asyncEmit('message', JSON.parse(JSON.stringify(data))); + }, + + /** + * EventEmitter, that behaves (calls listeners) asynchronously. + * A way to send customized messages to / from the worker. + * Events from in the worker can be observed / emitted via + * worker.on / worker.emit. + */ + get port() { + // We generate dynamically this attribute as it needs to be accessible + // before Worker.constructor gets called. (For ex: Panel) + + // create an event emitter that receive and send events from/to the worker + let self = this; + this._port = EventEmitterTrait.create({ + emit: function () self._emitEventToContent(arguments) + }); + // create emit that executes in next turn of event loop. + this._port._asyncEmit = Enqueued(this._port._emit); + // expose wrapped port, that exposes only public properties: + // We need to destroy this getter in order to be able to set the + // final value. We need to update only public port attribute as we never + // try to access port attribute from private API. + delete this._public.port; + this._public.port = Cortex(this._port); + // Replicate public port to the private object + delete this.port; + this.port = this._public.port; + + return this._port; + }, + + /** + * Same object than this.port but private API. + * Allow access to _asyncEmit, in order to send event to port. + */ + _port: null, + + /** + * Emit a custom event to the content script, + * i.e. emit this event on `self.port` + */ + _emitEventToContent: function _emitEventToContent(args) { + // We need to save events that are emitted before the worker is + // initialized + if (!this._inited) { + this._earlyEvents.push(args); + return; + } + + // We throw exception when the worker has been destroyed + if (!this._contentWorker) { + throw new Error(ERR_DESTROYED); + } + + let scope = this._contentWorker._port; + // Ensure that we pass only JSON values + scope._asyncEmit.apply(scope, ensureArgumentsAreJSON(args)); + }, + + // Is worker connected to the content worker (i.e. WorkerGlobalScope) ? + _inited: false, + + // List of custom events fired before worker is initialized + get _earlyEvents() { + delete this._earlyEvents; + this._earlyEvents = []; + return this._earlyEvents; + }, + + constructor: function Worker(options) { + options = options || {}; + + if ('window' in options) + this._window = options.window; + if ('contentScriptFile' in options) + this.contentScriptFile = options.contentScriptFile; + if ('contentScript' in options) + this.contentScript = options.contentScript; + if ('onError' in options) + this.on('error', options.onError); + if ('onMessage' in options) + this.on('message', options.onMessage); + if ('onDetach' in options) + this.on('detach', options.onDetach); + + // Track document unload to destroy this worker. + // We can't watch for unload event on page's window object as it + // prevents bfcache from working: + // https://developer.mozilla.org/En/Working_with_BFCache + this._windowID = this._window. + QueryInterface(Ci.nsIInterfaceRequestor). + getInterface(Ci.nsIDOMWindowUtils). + currentInnerWindowID; + observers.add("inner-window-destroyed", + this._documentUnload = this._documentUnload.bind(this)); + + unload.ensure(this._public, "destroy"); + + // Ensure that worker._port is initialized for contentWorker to be able + // to send use event during WorkerGlobalScope(this) + this.port; + + // will set this._contentWorker pointing to the private API: + WorkerGlobalScope(this); + + // Mainly enable worker.port.emit to send event to the content worker + this._inited = true; + + // Flush all events that have been fired before the worker is initialized. + this._earlyEvents.forEach((function (args) this._emitEventToContent(args)). + bind(this)); + }, + + _documentUnload: function _documentUnload(subject, topic, data) { + let innerWinID = subject.QueryInterface(Ci.nsISupportsPRUint64).data; + if (innerWinID != this._windowID) return false; + this._workerCleanup(); + return true; + }, + + get url() { + // this._window will be null after detach + return this._window ? this._window.document.location.href : null; + }, + + get tab() { + if (this._window) { + let tab = require("../tabs/tab"); + // this._window will be null after detach + return tab.getTabForWindow(this._window); + } + return null; + }, + + /** + * Tells content worker to unload itself and + * removes all the references from itself. + */ + destroy: function destroy() { + this._workerCleanup(); + this._removeAllListeners('message'); + this._removeAllListeners('error'); + this._removeAllListeners('detach'); + }, + + /** + * Remove all internal references to the attached document + * Tells _port to unload itself and removes all the references from itself. + */ + _workerCleanup: function _workerCleanup() { + // maybe unloaded before content side is created + // As Symbiont call worker.constructor on document load + if (this._contentWorker) + this._contentWorker._destructor(); + this._contentWorker = null; + this._window = null; + // This method may be called multiple times, + // avoid dispatching `detach` event more than once + if (this._windowID) { + this._windowID = null; + observers.remove("inner-window-destroyed", this._documentUnload); + this._earlyEvents.slice(0, this._earlyEvents.length); + this._emit("detach"); + } + }, + + /** + * Receive an event from the content script that need to be sent to + * worker.port. Provide a way for composed object to catch all events. + */ + _onContentScriptEvent: function _onContentScriptEvent() { + // Ensure that we pass only JSON values + this._port._asyncEmit.apply(this._port, ensureArgumentsAreJSON(arguments)); + }, + + /** + * Reference to the content side of the worker. + * @type {WorkerGlobalScope} + */ + _contentWorker: null, + + /** + * Reference to the window that is accessible from + * the content scripts. + * @type {Object} + */ + _window: null, +}); +exports.Worker = Worker; + |