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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* 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/. */
#include "nsISupports.idl"
/**
* This interface allows Firefox to expose different implementations of its own
* classes to add-ons. Once an interposition is created, it must be assigned to
* an add-on using Cu.setAddonInterposition (JS) or xpc::SetAddonInterposition
* (C++). In both cases, the arguments should be the add-on ID and the
* interposition object (which must be an nsIAddonInterposition). This must
* happen before any compartments are created for the given add-on.
*
* Every time the add-on accesses a property on any object outside its own set
* of compartments, XPConnect will call the interposition's
* interpose method. If the interposition wants to replace the given
* property, it should return a replacement property descriptor for it. If not,
* it should return null.
*/
[scriptable,uuid(d05cc5fd-ad88-41a6-854c-36fd94d69ddb)]
interface nsIAddonInterposition : nsISupports
{
/**
* Returns a replacement property descriptor for a browser object.
*
* @param addonId The ID of the add-on accessing the property.
* @param target The browser object being accessed.
* @param iface The IID of the interface the property is associated with. This
* parameter is only available for XPCWrappedNative targets. As
* such, it's only useful as an optimization to avoid
* instanceof checks on the target.
* @param prop The name of the property being accessed.
* @return A property descriptor or null.
*/
jsval interposeProperty(in jsval addonId,
in jsval target,
in nsIIDPtr iface,
in jsval prop);
/**
* We're intercepting calls from add-ons scopes into non-addon scopes.
*
* @param addonId The ID of the add-on accessing the property.
* @param originalFunc The function object being intercepted.
* @param originalThis The |this| value for the intercepted call.
* @param args The arguments of the original call in an array.
* @return The result of the call. NOTE: after the call interception,
* the original function will not be called automatically, so the
* implementer has to do that.
*/
jsval interposeCall(in jsval addonId,
in jsval originalFunc,
in jsval originalThis,
in jsval args);
/**
* For the first time when the interposition is registered the engine
* calls getWhitelist and expects an array of strings. The strings are
* the name of properties the interposition wants interposeProperty
* to be called. It can be an empty array.
* Note: for CPOWs interposeProperty is always called regardless if
* the name of the property is on the whitelist or not.
*/
jsval getWhitelist();
};
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