diff options
Diffstat (limited to 'browser/components/extensions/child/ext-menus.js')
| -rw-r--r-- | browser/components/extensions/child/ext-menus.js | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/browser/components/extensions/child/ext-menus.js b/browser/components/extensions/child/ext-menus.js new file mode 100644 index 0000000000..6c3b7ae492 --- /dev/null +++ b/browser/components/extensions/child/ext-menus.js @@ -0,0 +1,305 @@ +/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */ +/* vim: set sts=2 sw=2 et tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this file, + * You can obtain one at http://mozilla.org/MPL/2.0/. */ + +"use strict"; + +var { withHandlingUserInput } = ExtensionCommon; + +var { ExtensionError } = ExtensionUtils; + +// If id is not specified for an item we use an integer. +// This ID need only be unique within a single addon. Since all addon code that +// can use this API runs in the same process, this local variable suffices. +var gNextMenuItemID = 0; + +// Map[Extension -> Map[string or id, ContextMenusClickPropHandler]] +var gPropHandlers = new Map(); + +// The contextMenus API supports an "onclick" attribute in the create/update +// methods to register a callback. This class manages these onclick properties. +class ContextMenusClickPropHandler { + constructor(context) { + this.context = context; + // Map[string or integer -> callback] + this.onclickMap = new Map(); + this.dispatchEvent = this.dispatchEvent.bind(this); + } + + // A listener on contextMenus.onClicked that forwards the event to the only + // listener, if any. + dispatchEvent(info, tab) { + let onclick = this.onclickMap.get(info.menuItemId); + if (onclick) { + // No need for runSafe or anything because we are already being run inside + // an event handler -- the event is just being forwarded to the actual + // handler. + withHandlingUserInput(this.context.contentWindow, () => + onclick(info, tab) + ); + } + } + + // Sets the `onclick` handler for the given menu item. + // The `onclick` function MUST be owned by `this.context`. + setListener(id, onclick) { + if (this.onclickMap.size === 0) { + this.context.childManager + .getParentEvent("menusInternal.onClicked") + .addListener(this.dispatchEvent); + this.context.callOnClose(this); + } + this.onclickMap.set(id, onclick); + + let propHandlerMap = gPropHandlers.get(this.context.extension); + if (!propHandlerMap) { + propHandlerMap = new Map(); + } else { + // If the current callback was created in a different context, remove it + // from the other context. + let propHandler = propHandlerMap.get(id); + if (propHandler && propHandler !== this) { + propHandler.unsetListener(id); + } + } + propHandlerMap.set(id, this); + gPropHandlers.set(this.context.extension, propHandlerMap); + } + + // Deletes the `onclick` handler for the given menu item. + // The `onclick` function MUST be owned by `this.context`. + unsetListener(id) { + if (!this.onclickMap.delete(id)) { + return; + } + if (this.onclickMap.size === 0) { + this.context.childManager + .getParentEvent("menusInternal.onClicked") + .removeListener(this.dispatchEvent); + this.context.forgetOnClose(this); + } + let propHandlerMap = gPropHandlers.get(this.context.extension); + propHandlerMap.delete(id); + if (propHandlerMap.size === 0) { + gPropHandlers.delete(this.context.extension); + } + } + + // Deletes the `onclick` handler for the given menu item, if any, regardless + // of the context where it was created. + unsetListenerFromAnyContext(id) { + let propHandlerMap = gPropHandlers.get(this.context.extension); + let propHandler = propHandlerMap && propHandlerMap.get(id); + if (propHandler) { + propHandler.unsetListener(id); + } + } + + // Remove all `onclick` handlers of the extension. + deleteAllListenersFromExtension() { + let propHandlerMap = gPropHandlers.get(this.context.extension); + if (propHandlerMap) { + for (let [id, propHandler] of propHandlerMap) { + propHandler.unsetListener(id); + } + } + } + + // Removes all `onclick` handlers from this context. + close() { + for (let id of this.onclickMap.keys()) { + this.unsetListener(id); + } + } +} + +this.menusInternal = class extends ExtensionAPI { + getAPI(context) { + let { extension } = context; + let onClickedProp = new ContextMenusClickPropHandler(context); + let pendingMenuEvent; + + let api = { + menus: { + create(createProperties, callback) { + let caller = context.getCaller(); + + if (extension.persistentBackground && createProperties.id === null) { + createProperties.id = ++gNextMenuItemID; + } + let { onclick } = createProperties; + if (onclick && !context.extension.persistentBackground) { + throw new ExtensionError( + `Property "onclick" cannot be used in menus.create, replace with an "onClicked" event listener.` + ); + } + delete createProperties.onclick; + context.childManager + .callParentAsyncFunction("menusInternal.create", [createProperties]) + .then(() => { + if (onclick) { + onClickedProp.setListener(createProperties.id, onclick); + } + if (callback) { + context.runSafeWithoutClone(callback); + } + }) + .catch(error => { + context.withLastError(error, caller, () => { + if (callback) { + context.runSafeWithoutClone(callback); + } + }); + }); + return createProperties.id; + }, + + update(id, updateProperties) { + let { onclick } = updateProperties; + if (onclick && !context.extension.persistentBackground) { + throw new ExtensionError( + `Property "onclick" cannot be used in menus.update, replace with an "onClicked" event listener.` + ); + } + delete updateProperties.onclick; + return context.childManager + .callParentAsyncFunction("menusInternal.update", [ + id, + updateProperties, + ]) + .then(() => { + if (onclick) { + onClickedProp.setListener(id, onclick); + } else if (onclick === null) { + onClickedProp.unsetListenerFromAnyContext(id); + } + // else onclick is not set so it should not be changed. + }); + }, + + remove(id) { + onClickedProp.unsetListenerFromAnyContext(id); + return context.childManager.callParentAsyncFunction( + "menusInternal.remove", + [id] + ); + }, + + removeAll() { + onClickedProp.deleteAllListenersFromExtension(); + + return context.childManager.callParentAsyncFunction( + "menusInternal.removeAll", + [] + ); + }, + + overrideContext(contextOptions) { + let checkValidArg = (contextType, propKey) => { + if (contextOptions.context !== contextType) { + if (contextOptions[propKey]) { + throw new ExtensionError( + `Property "${propKey}" can only be used with context "${contextType}"` + ); + } + return false; + } + if (contextOptions.showDefaults) { + throw new ExtensionError( + `Property "showDefaults" cannot be used with context "${contextType}"` + ); + } + if (!contextOptions[propKey]) { + throw new ExtensionError( + `Property "${propKey}" is required for context "${contextType}"` + ); + } + return true; + }; + if (checkValidArg("tab", "tabId")) { + if (!context.extension.hasPermission("tabs")) { + throw new ExtensionError( + `The "tab" context requires the "tabs" permission.` + ); + } + } + if (checkValidArg("bookmark", "bookmarkId")) { + if (!context.extension.hasPermission("bookmarks")) { + throw new ExtensionError( + `The "bookmark" context requires the "bookmarks" permission.` + ); + } + } + + let webExtContextData = { + extensionId: context.extension.id, + showDefaults: contextOptions.showDefaults, + overrideContext: contextOptions.context, + bookmarkId: contextOptions.bookmarkId, + tabId: contextOptions.tabId, + }; + + if (pendingMenuEvent) { + // overrideContext is called more than once during the same event. + pendingMenuEvent.webExtContextData = webExtContextData; + return; + } + pendingMenuEvent = { + webExtContextData, + observe(subject, topic, data) { + pendingMenuEvent = null; + Services.obs.removeObserver(this, "on-prepare-contextmenu"); + subject = subject.wrappedJSObject; + if (context.principal.subsumes(subject.principal)) { + subject.setWebExtContextData(this.webExtContextData); + } + }, + run() { + // "on-prepare-contextmenu" is expected to be observed before the + // end of the "contextmenu" event dispatch. This task is queued + // in case that does not happen, e.g. when the menu is not shown. + // ... or if the method was not called during a contextmenu event. + if (pendingMenuEvent === this) { + pendingMenuEvent = null; + Services.obs.removeObserver(this, "on-prepare-contextmenu"); + } + }, + }; + Services.obs.addObserver(pendingMenuEvent, "on-prepare-contextmenu"); + Services.tm.dispatchToMainThread(pendingMenuEvent); + }, + + onClicked: new EventManager({ + context, + name: "menus.onClicked", + register: fire => { + let listener = (info, tab) => { + withHandlingUserInput(context.contentWindow, () => + fire.sync(info, tab) + ); + }; + + let event = context.childManager.getParentEvent( + "menusInternal.onClicked" + ); + event.addListener(listener); + return () => { + event.removeListener(listener); + }; + }, + }).api(), + }, + }; + + const result = {}; + if (context.extension.hasPermission("menus")) { + result.menus = api.menus; + } + if (context.extension.hasPermission("contextMenus")) { + result.contextMenus = api.menus; + } + return result; + } +}; |