551 lines
20 KiB
Plaintext
551 lines
20 KiB
Plaintext
/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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interface mozIDOMWindowProxy;
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interface nsIDocShell;
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interface nsIContent;
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interface nsIFrameLoader;
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interface nsIPrincipal;
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/**
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* Message managers provide a way for chrome-privileged JS code to
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* communicate with each other, even across process boundaries.
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*
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* Message managers are separated into "parent side" and "child side".
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* These don't always correspond to process boundaries, but can. For
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* each child-side message manager, there is always exactly one
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* corresponding parent-side message manager that it sends messages
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* to. However, for each parent-side message manager, there may be
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* either one or many child-side managers it can message.
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*
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* Message managers that always have exactly one "other side" are of
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* type nsIMessageSender. Parent-side message managers that have many
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* "other sides" are of type nsIMessageBroadcaster.
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*
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* Child-side message managers can send synchronous messages to their
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* parent side, but not the other way around.
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*
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* There are two realms of message manager hierarchies. One realm
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* approximately corresponds to DOM elements, the other corresponds to
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* process boundaries.
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*
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* Message managers corresponding to DOM elements
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* ==============================================
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*
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* In this realm of message managers, there are
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* - "frame message managers" which correspond to frame elements
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* - "window message managers" which correspond to top-level chrome
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* windows
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* - "group message managers" which correspond to named message
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* managers with a specific window MM as the parent
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* - the "global message manager", on the parent side. See below.
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*
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* The DOM-realm message managers can communicate in the ways shown by
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* the following diagram. The parent side and child side can
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* correspond to process boundaries, but don't always.
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*
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* Parent side Child side
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* ------------- ------------
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* global MMg
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* |
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* +-->window MMw1
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* | |
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* | +-->frame MMp1_1<------------>frame MMc1_1
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* | |
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* | +-->frame MMp1_2<------------>frame MMc1_2
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* | |
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* | +-->group MMgr1
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* | | |
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* | | +-->frame MMp2_1<------->frame MMc2_1
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* | | |
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* | | +-->frame MMp2_2<------->frame MMc2_2
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* | |
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* | +-->group MMgr2
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* | | ...
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* | |
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* | ...
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* |
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* +-->window MMw2
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* ...
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*
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* For example: a message sent from MMc1_1, from the child side, is
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* sent only to MMp1_1 on the parent side. However, note that all
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* message managers in the hierarchy above MMp1_1, in this diagram
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* MMw1 and MMg, will also notify their message listeners when the
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* message arrives.
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*
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* A message sent from MMc2_1 will be sent to MMp2_1 and also notify
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* all message managers in the hierarchy above that, including the
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* group message manager MMgr1.
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* For example: a message broadcast through the global MMg on the
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* parent side would be broadcast to MMw1, which would transitively
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* broadcast it to MMp1_1, MM1p_2. The message would next be
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* broadcast to MMgr1, which would broadcast it to MMp2_1 and MMp2_2.
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* After that it would broadcast to MMgr2 and then to MMw2, and so
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* on down the hierarchy.
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*
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* ***** PERFORMANCE AND SECURITY WARNING *****
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* Messages broadcast through the global MM and window or group MMs
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* can result in messages being dispatched across many OS processes,
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* and to many processes with different permissions. Great care
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* should be taken when broadcasting.
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*
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* Interfaces
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* ----------
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*
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* The global MMg and window MMw's are message broadcasters implementing
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* nsIMessageBroadcaster while the frame MMp's are simple message senders
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* (nsIMessageSender). Their counterparts in the content processes are
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* message senders implementing nsIContentFrameMessageManager.
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*
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* nsIMessageListenerManager
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* / \
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* nsIMessageSender nsIMessageBroadcaster
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* |
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* nsISyncMessageSender (content process/in-process only)
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* |
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* nsIContentFrameMessageManager (content process/in-process only)
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* |
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* nsIInProcessContentFrameMessageManager (in-process only)
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*
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*
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* Message managers in the chrome process can also be QI'ed to nsIFrameScriptLoader.
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*
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*
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* Message managers corresponding to process boundaries
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* ====================================================
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*
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* The second realm of message managers is the "process message
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* managers". With one exception, these always correspond to process
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* boundaries. The picture looks like
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*
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* Parent process Child processes
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* ---------------- -----------------
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* global (GPPMM)
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* |
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* +-->parent in-process PIPMM<-->child in-process CIPPMM
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* |
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* +-->parent (PPMM1)<------------------>child (CPMM1)
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* |
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* +-->parent (PPMM2)<------------------>child (CPMM2)
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* ...
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*
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* Note, PIPMM and CIPPMM both run in the parent process.
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*
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* For example: the parent-process PPMM1 sends messages to the
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* child-process CPMM1.
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*
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* For example: CPMM1 sends messages directly to PPMM1. The global GPPMM
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* will also notify their message listeners when the message arrives.
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*
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* For example: messages sent through the global GPPMM will be
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* dispatched to the listeners of the same-process, CIPPMM, CPMM1,
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* CPMM2, etc.
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*
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* ***** PERFORMANCE AND SECURITY WARNING *****
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* Messages broadcast through the GPPMM can result in messages
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* being dispatched across many OS processes, and to many processes
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* with different permissions. Great care should be taken when
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* broadcasting.
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*
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* Requests sent to parent-process message listeners should usually
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* have replies scoped to the requesting CPMM. The following pattern
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* is common
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*
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* const ParentProcessListener = {
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* receiveMessage: function(aMessage) {
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* let childMM = aMessage.target.QueryInterface(Ci.nsIMessageSender);
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* switch (aMessage.name) {
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* case "Foo:Request":
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* // service request
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* childMM.sendAsyncMessage("Foo:Response", { data });
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* }
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* }
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* };
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*/
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[scriptable, function, uuid(2b44eb57-a9c6-4773-9a1e-fe0818739a4c)]
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interface nsIMessageListener : nsISupports
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{
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/**
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* This is for JS only.
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* receiveMessage is called with one parameter, which has the following
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* properties:
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* {
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* target: %the target of the message. Either an element owning
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* the message manager, or message manager itself if no
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* element owns it%
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* name: %message name%,
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* sync: %true or false%.
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* data: %structured clone of the sent message data%,
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* json: %same as .data, deprecated%,
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* objects: %named table of jsvals/objects, or null%
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* principal: %principal for the window app
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* }
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*
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* Each listener is invoked with its own copy of the message
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* parameter.
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*
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* When the listener is called, 'this' value is the target of the message.
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*
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* If the message is synchronous, the possible return value is
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* returned as JSON (will be changed to use structured clones).
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* When there are multiple listeners to sync messages, each
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* listener's return value is sent back as an array. |undefined|
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* return values show up as undefined values in the array.
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*/
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void receiveMessage();
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};
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[scriptable, builtinclass, uuid(b949bfec-bb7d-47bc-b387-ac6a9b655072)]
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interface nsIMessageListenerManager : nsISupports
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{
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/**
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* Register |listener| to receive |messageName|. All listener
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* callbacks for a particular message are invoked when that message
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* is received.
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*
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* The message manager holds a strong ref to |listener|.
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*
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* If the same listener registers twice for the same message, the
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* second registration is ignored.
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*
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* Pass true for listenWhenClosed if you want to receive messages
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* during the short period after a frame has been removed from the
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* DOM and before its frame script has finished unloading. This
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* parameter only has an effect for frame message managers in
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* the main process. Default is false.
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*/
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void addMessageListener(in AString messageName,
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in nsIMessageListener listener,
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[optional] in boolean listenWhenClosed);
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/**
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* Undo an |addMessageListener| call -- that is, calling this causes us to no
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* longer invoke |listener| when |messageName| is received.
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*
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* removeMessageListener does not remove a message listener added via
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* addWeakMessageListener; use removeWeakMessageListener for that.
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*/
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void removeMessageListener(in AString messageName,
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in nsIMessageListener listener);
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/**
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* This is just like addMessageListener, except the message manager holds a
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* weak ref to |listener|.
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*
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* If you have two weak message listeners for the same message, they may be
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* called in any order.
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*/
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void addWeakMessageListener(in AString messageName,
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in nsIMessageListener listener);
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/**
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* This undoes an |addWeakMessageListener| call.
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*/
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void removeWeakMessageListener(in AString messageName,
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in nsIMessageListener listener);
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[notxpcom] boolean markForCC();
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};
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/**
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* Message "senders" have a single "other side" to which messages are
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* sent. For example, a child-process message manager will send
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* messages that are only delivered to its one parent-process message
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* manager.
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*/
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[scriptable, builtinclass, uuid(bb5d79e4-e73c-45e7-9651-4d718f4b994c)]
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interface nsIMessageSender : nsIMessageListenerManager
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{
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/**
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* Send |messageName| and |obj| to the "other side" of this message
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* manager. This invokes listeners who registered for
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* |messageName|.
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*
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* See nsIMessageListener::receiveMessage() for the format of the
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* data delivered to listeners.
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* @throws NS_ERROR_NOT_INITIALIZED if the sender is not initialized. For
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* example, we will throw NS_ERROR_NOT_INITIALIZED if we try to send
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* a message to a cross-process frame but the other process has not
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* yet been set up.
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* @throws NS_ERROR_FAILURE when the message receiver cannot be found. For
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* example, we will throw NS_ERROR_FAILURE if we try to send a message
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* to a cross-process frame whose process has crashed.
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*/
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[implicit_jscontext, optional_argc]
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void sendAsyncMessage([optional] in AString messageName,
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[optional] in jsval obj,
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[optional] in jsval objects,
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[optional] in nsIPrincipal principal,
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[optional] in jsval transfers);
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/**
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* For remote browsers there is always a corresponding process message
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* manager. The intention of this attribute is to link leaf level frame
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* message managers on the parent side with the corresponding process
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* message managers (if there is one). For any other cases this property
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* is null.
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*/
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readonly attribute nsIMessageSender processMessageManager;
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};
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/**
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* Message "broadcasters" don't have a single "other side" that they
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* send messages to, but rather a set of subordinate message managers.
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* For example, broadcasting a message through a window message
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* manager will broadcast the message to all frame message managers
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* within its window.
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*/
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[scriptable, builtinclass, uuid(4d7d62ad-4725-4f39-86cf-8fb22bf9c1d8)]
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interface nsIMessageBroadcaster : nsIMessageListenerManager
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{
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/**
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* Like |sendAsyncMessage()|, but also broadcasts this message to
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* all "child" message managers of this message manager. See long
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* comment above for details.
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*
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* WARNING: broadcasting messages can be very expensive and leak
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* sensitive data. Use with extreme caution.
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*/
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[implicit_jscontext, optional_argc]
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void broadcastAsyncMessage([optional] in AString messageName,
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[optional] in jsval obj,
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[optional] in jsval objects);
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/**
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* Number of subordinate message managers.
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*/
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readonly attribute unsigned long childCount;
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/**
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* Return a single subordinate message manager.
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*/
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nsIMessageListenerManager getChildAt(in unsigned long aIndex);
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};
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[scriptable, builtinclass, uuid(0e602c9e-1977-422a-a8e4-fe0d4a4f78d0)]
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interface nsISyncMessageSender : nsIMessageSender
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{
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/**
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* Like |sendAsyncMessage()|, except blocks the sender until all
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* listeners of the message have been invoked. Returns an array
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* containing return values from each listener invoked.
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*/
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[implicit_jscontext, optional_argc]
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jsval sendSyncMessage([optional] in AString messageName,
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[optional] in jsval obj,
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[optional] in jsval objects,
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[optional] in nsIPrincipal principal);
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/**
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* Like |sendSyncMessage()|, except re-entrant. New RPC messages may be
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* issued even if, earlier on the call stack, we are waiting for a reply
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* to an earlier sendRpcMessage() call.
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*
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* Both sendSyncMessage and sendRpcMessage will block until a reply is
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* received, but they may be temporarily interrupted to process an urgent
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* incoming message (such as a CPOW request).
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*/
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[implicit_jscontext, optional_argc]
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jsval sendRpcMessage([optional] in AString messageName,
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[optional] in jsval obj,
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[optional] in jsval objects,
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[optional] in nsIPrincipal principal);
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};
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[scriptable, builtinclass, uuid(13f3555f-769e-44ea-b607-5239230c3162)]
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interface nsIMessageManagerGlobal : nsISyncMessageSender
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{
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/**
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* Print a string to stdout.
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*/
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void dump(in DOMString aStr);
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/**
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* If leak detection is enabled, print a note to the leak log that this
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* process will intentionally crash.
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*/
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void privateNoteIntentionalCrash();
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/**
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* Ascii base64 data to binary data and vice versa
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*/
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DOMString atob(in DOMString aAsciiString);
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DOMString btoa(in DOMString aBase64Data);
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};
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[scriptable, builtinclass, uuid(694e367c-aa25-4446-8499-2c527c4bd838)]
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interface nsIContentFrameMessageManager : nsIMessageManagerGlobal
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{
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/**
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* The current top level window in the frame or null.
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*/
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readonly attribute mozIDOMWindowProxy content;
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/**
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* The top level docshell or null.
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*/
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readonly attribute nsIDocShell docShell;
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};
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[uuid(b39a3324-b574-4f85-8cdb-274d04f807ef)]
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interface nsIInProcessContentFrameMessageManager : nsIContentFrameMessageManager
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{
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[notxpcom] nsIContent getOwnerContent();
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[notxpcom] void cacheFrameLoader(in nsIFrameLoader aFrameLoader);
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};
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[scriptable, builtinclass, uuid(6d12e467-2446-46db-9965-e4e93cb87ca5)]
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interface nsIContentProcessMessageManager : nsIMessageManagerGlobal
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{
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/**
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* Read out a copy of the object that was initialized in the parent
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* process via nsIProcessScriptLoader.initialProcessData.
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*/
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[implicit_jscontext]
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readonly attribute jsval initialProcessData;
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};
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[scriptable, builtinclass, uuid(bf61446b-ba24-4b1d-88c7-4f94724b9ce1)]
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interface nsIFrameScriptLoader : nsISupports
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{
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/**
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* Load a script in the (remote) frame. aURL must be the absolute URL.
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* data: URLs are also supported. For example data:,dump("foo\n");
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* If aAllowDelayedLoad is true, script will be loaded when the
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* remote frame becomes available. Otherwise the script will be loaded
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* only if the frame is already available.
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*/
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void loadFrameScript(in AString aURL, in boolean aAllowDelayedLoad,
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[optional] in boolean aRunInGlobalScope);
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/**
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* Removes aURL from the list of scripts which support delayed load.
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*/
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void removeDelayedFrameScript(in AString aURL);
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/**
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* Returns all delayed scripts that will be loaded once a (remote)
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* frame becomes available. The return value is a list of pairs
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* [<URL>, <WasLoadedInGlobalScope>].
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*/
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[implicit_jscontext]
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jsval getDelayedFrameScripts();
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};
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[scriptable, builtinclass, uuid(7e1e1a20-b24f-11e4-ab27-0800200c9a66)]
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interface nsIProcessScriptLoader : nsISupports
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{
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/**
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* Load a script in the (possibly remote) process. aURL must be the absolute URL.
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* data: URLs are also supported. For example data:,dump("foo\n");
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* If aAllowDelayedLoad is true, script will be loaded when the
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* remote frame becomes available. Otherwise the script will be loaded
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* only if the frame is already available.
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*/
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void loadProcessScript(in AString aURL, in boolean aAllowDelayedLoad);
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/**
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* Removes aURL from the list of scripts which support delayed load.
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*/
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void removeDelayedProcessScript(in AString aURL);
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/**
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* Returns all delayed scripts that will be loaded once a (remote)
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* frame becomes available. The return value is a list of URLs.
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*/
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[implicit_jscontext]
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jsval getDelayedProcessScripts();
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};
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[scriptable, builtinclass, uuid(5b390753-abb3-49b0-ae3b-b803dab58144)]
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interface nsIGlobalProcessScriptLoader : nsIProcessScriptLoader
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{
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/**
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* Allows the parent process to set the initial process data for
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* new, not-yet-created child processes. This attribute should only
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* be used by the global parent process message manager. When a new
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* process is created, it gets a copy of this data (via structured
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* cloning). It can access the data via the initialProcessData
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* attribute of its childprocessmessagemanager.
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*
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* This value will always be a JS object. Different users are
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* expected to set properties on this object. The property name
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* should be unique enough that other Gecko consumers won't
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* accidentally choose it.
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*/
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[implicit_jscontext]
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readonly attribute jsval initialProcessData;
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};
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[scriptable, builtinclass, uuid(637e8538-4f8f-4a3d-8510-e74386233e19)]
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interface nsIProcessChecker : nsISupports
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{
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bool killChild();
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|
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/**
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* Return true if the "remote" process has |aPermission|. This is
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* intended to be used by JS implementations of cross-process DOM
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* APIs, like so
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*
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* recvFooRequest: function(message) {
|
|
* if (!message.target.assertPermission("foo")) {
|
|
* return false;
|
|
* }
|
|
* // service foo request
|
|
*
|
|
* This interface only returns meaningful data when our content is
|
|
* in a separate process. If it shares the same OS process as us,
|
|
* then applying this permission check doesn't add any security,
|
|
* though it doesn't hurt anything either.
|
|
*
|
|
* Note: If the remote content process does *not* have |aPermission|,
|
|
* it will be killed as a precaution.
|
|
*/
|
|
boolean assertPermission(in DOMString aPermission);
|
|
|
|
/**
|
|
* Return true if the "remote" process has |aManifestURL|. This is
|
|
* intended to be used by JS implementations of cross-process DOM
|
|
* APIs, like so
|
|
*
|
|
* recvFooRequest: function(message) {
|
|
* if (!message.target.assertContainApp("foo")) {
|
|
* return false;
|
|
* }
|
|
* // service foo request
|
|
*
|
|
* This interface only returns meaningful data when our content is
|
|
* in a separate process. If it shares the same OS process as us,
|
|
* then applying this manifest URL check doesn't add any security,
|
|
* though it doesn't hurt anything either.
|
|
*
|
|
* Note: If the remote content process does *not* contain |aManifestURL|,
|
|
* it will be killed as a precaution.
|
|
*/
|
|
boolean assertContainApp(in DOMString aManifestURL);
|
|
|
|
boolean assertAppHasPermission(in DOMString aPermission);
|
|
|
|
/**
|
|
* Return true if the "remote" process' principal has an appStatus equal to
|
|
* |aStatus|.
|
|
*
|
|
* This interface only returns meaningful data when our content is
|
|
* in a separate process. If it shares the same OS process as us,
|
|
* then applying this permission check doesn't add any security,
|
|
* though it doesn't hurt anything either.
|
|
*
|
|
* Note: If the remote content process does *not* has the |aStatus|,
|
|
* it will be killed as a precaution.
|
|
*/
|
|
boolean assertAppHasStatus(in unsigned short aStatus);
|
|
|
|
};
|