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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
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dom/base/nsIContentPolicy.idl Normal file
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ft=cpp tw=78 sw=2 et ts=8 : */
/* 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"
#include "nsIContentPolicyBase.idl"
interface nsIURI;
interface nsIDOMNode;
interface nsIPrincipal;
/**
* Interface for content policy mechanism. Implementations of this
* interface can be used to control loading of various types of out-of-line
* content, or processing of certain types of in-line content.
*
* WARNING: do not block the caller from shouldLoad or shouldProcess (e.g.,
* by launching a dialog to prompt the user for something).
*/
[scriptable,uuid(caad4f1f-d047-46ac-ae9d-dc598e4fb91b)]
interface nsIContentPolicy : nsIContentPolicyBase
{
/**
* Should the resource at this location be loaded?
* ShouldLoad will be called before loading the resource at aContentLocation
* to determine whether to start the load at all.
*
* @param aContentType the type of content being tested. This will be one
* one of the TYPE_* constants.
*
* @param aContentLocation the location of the content being checked; must
* not be null
*
* @param aRequestOrigin OPTIONAL. the location of the resource that
* initiated this load request; can be null if
* inapplicable
*
* @param aContext OPTIONAL. the nsIDOMNode or nsIDOMWindow that
* initiated the request, or something that can QI
* to one of those; can be null if inapplicable.
* Note that for navigation events (new windows and
* link clicks), this is the NEW window.
*
* @param aMimeTypeGuess OPTIONAL. a guess for the requested content's
* MIME type, based on information available to
* the request initiator (e.g., an OBJECT's type
* attribute); does not reliably reflect the
* actual MIME type of the requested content
*
* @param aExtra an OPTIONAL argument, pass-through for non-Gecko
* callers to pass extra data to callees.
*
* @param aRequestPrincipal an OPTIONAL argument, defines the principal that
* caused the load. This is optional only for
* non-gecko code: all gecko code should set this
* argument. For navigation events, this is
* the principal of the page that caused this load.
*
* @return ACCEPT or REJECT_*
*
* @note shouldLoad can be called while the DOM and layout of the document
* involved is in an inconsistent state. This means that implementors of
* this method MUST NOT do any of the following:
* 1) Modify the DOM in any way (e.g. setting attributes is a no-no).
* 2) Query any DOM properties that depend on layout (e.g. offset*
* properties).
* 3) Query any DOM properties that depend on style (e.g. computed style).
* 4) Query any DOM properties that depend on the current state of the DOM
* outside the "context" node (e.g. lengths of node lists).
* 5) [JavaScript implementations only] Access properties of any sort on any
* object without using XPCNativeWrapper (either explicitly or
* implicitly). Due to various DOM0 things, this leads to item 4.
* If you do any of these things in your shouldLoad implementation, expect
* unpredictable behavior, possibly including crashes, content not showing
* up, content showing up doubled, etc. If you need to do any of the things
* above, do them off timeout or event.
*/
short shouldLoad(in nsContentPolicyType aContentType,
in nsIURI aContentLocation,
in nsIURI aRequestOrigin,
in nsISupports aContext,
in ACString aMimeTypeGuess,
in nsISupports aExtra,
[optional] in nsIPrincipal aRequestPrincipal);
/**
* Should the resource be processed?
* ShouldProcess will be called once all the information passed to it has
* been determined about the resource, typically after part of the resource
* has been loaded.
*
* @param aContentType the type of content being tested. This will be one
* one of the TYPE_* constants.
*
* @param aContentLocation OPTIONAL; the location of the resource being
* requested: MAY be, e.g., a post-redirection URI
* for the resource.
*
* @param aRequestOrigin OPTIONAL. the location of the resource that
* initiated this load request; can be null if
* inapplicable
*
* @param aContext OPTIONAL. the nsIDOMNode or nsIDOMWindow that
* initiated the request, or something that can QI
* to one of those; can be null if inapplicable.
*
* @param aMimeType the MIME type of the requested resource (e.g.,
* image/png), as reported by the networking library,
* if available (may be empty if inappropriate for
* the type, e.g., TYPE_REFRESH).
*
* @param aExtra an OPTIONAL argument, pass-through for non-Gecko
* callers to pass extra data to callees.
*
* @return ACCEPT or REJECT_*
*
* @note shouldProcess can be called while the DOM and layout of the document
* involved is in an inconsistent state. See the note on shouldLoad to see
* what this means for implementors of this method.
*/
short shouldProcess(in nsContentPolicyType aContentType,
in nsIURI aContentLocation,
in nsIURI aRequestOrigin,
in nsISupports aContext,
in ACString aMimeType,
in nsISupports aExtra,
[optional] in nsIPrincipal aRequestPrincipal);
};