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gecko-dev/dom/base/nsIContentPolicy.idl

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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"
interface nsIURI;
interface nsIDOMNode;
interface nsIPrincipal;
/**
* The type of nsIContentPolicy::TYPE_*
*/
typedef unsigned long nsContentPolicyType;
/**
* 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(94513f07-d559-480e-8879-6249852365ea)]
interface nsIContentPolicy : nsISupports
{
/**
* Indicates a unset or bogus policy type.
*/
const nsContentPolicyType TYPE_INVALID = 0;
/**
* Gecko/Firefox developers: Avoid using TYPE_OTHER. Especially for
* requests that are coming from webpages. Or requests in general which
* you expect that security checks will be done on.
* Always use a more specific type if one is available. And do not hesitate
* to add more types as appropriate.
* But if you are fairly sure that no one would care about your more specific
* type, then it's ok to use TYPE_OTHER.
*
* Extension developers: Whenever it is reasonable, use one of the existing
* content types. If none of the existing content types are right for
* something you are doing, file a bug in the Core/DOM component that
* includes a patch that adds your new content type to the end of the list of
* TYPE_* constants here. But, don't start using your new content type until
* your patch has been accepted, because it will be uncertain what exact
* value and name your new content type will have; in that interim period,
* use TYPE_OTHER. In your patch, document your new content type in the style
* of the existing ones. In the bug you file, provide a more detailed
* description of the new type of content you want Gecko to support, so that
* the existing implementations of nsIContentPolicy can be properly modified
* to deal with that new type of content.
*
* Implementations of nsIContentPolicy should treat this the same way they
* treat unknown types, because existing users of TYPE_OTHER may be converted
* to use new content types.
*/
const nsContentPolicyType TYPE_OTHER = 1;
/**
* Indicates an executable script (such as JavaScript).
*/
const nsContentPolicyType TYPE_SCRIPT = 2;
/**
* Indicates an image (e.g., IMG elements).
*/
const nsContentPolicyType TYPE_IMAGE = 3;
/**
* Indicates a stylesheet (e.g., STYLE elements).
*/
const nsContentPolicyType TYPE_STYLESHEET = 4;
/**
* Indicates a generic object (plugin-handled content typically falls under
* this category).
*/
const nsContentPolicyType TYPE_OBJECT = 5;
/**
* Indicates a document at the top-level (i.e., in a browser).
*/
const nsContentPolicyType TYPE_DOCUMENT = 6;
/**
* Indicates a document contained within another document (e.g., IFRAMEs,
* FRAMES, and OBJECTs).
*/
const nsContentPolicyType TYPE_SUBDOCUMENT = 7;
/**
* Indicates a timed refresh.
*
* shouldLoad will never get this, because it does not represent content
* to be loaded (the actual load triggered by the refresh will go through
* shouldLoad as expected).
*
* shouldProcess will get this for, e.g., META Refresh elements and HTTP
* Refresh headers.
*/
const nsContentPolicyType TYPE_REFRESH = 8;
/**
* Indicates an XBL binding request, triggered either by -moz-binding CSS
* property.
*/
const nsContentPolicyType TYPE_XBL = 9;
/**
* Indicates a ping triggered by a click on <A PING="..."> element.
*/
const nsContentPolicyType TYPE_PING = 10;
/**
* Indicates an XMLHttpRequest. Also used for document.load and for EventSource.
*/
const nsContentPolicyType TYPE_XMLHTTPREQUEST = 11;
const nsContentPolicyType TYPE_DATAREQUEST = 11; // alias
/**
* Indicates a request by a plugin.
*/
const nsContentPolicyType TYPE_OBJECT_SUBREQUEST = 12;
/**
* Indicates a DTD loaded by an XML document.
*/
const nsContentPolicyType TYPE_DTD = 13;
/**
* Indicates a font loaded via @font-face rule.
*/
const nsContentPolicyType TYPE_FONT = 14;
/**
* Indicates a video or audio load.
*/
const nsContentPolicyType TYPE_MEDIA = 15;
/**
* Indicates a WebSocket load.
*/
const nsContentPolicyType TYPE_WEBSOCKET = 16;
/**
* Indicates a Content Security Policy report.
*/
const nsContentPolicyType TYPE_CSP_REPORT = 17;
/**
* Indicates a style sheet transformation.
*/
const nsContentPolicyType TYPE_XSLT = 18;
/**
* Indicates a beacon post.
*/
const nsContentPolicyType TYPE_BEACON = 19;
/**
* Indicates a load initiated by the fetch() function from the Fetch
* specification.
*/
const nsContentPolicyType TYPE_FETCH = 20;
/**
* Indicates a <img srcset> or <picture> request.
*/
const nsContentPolicyType TYPE_IMAGESET = 21;
/* When adding new content types, please update nsContentBlocker,
* NS_CP_ContentTypeName, nsCSPContext, all nsIContentPolicy
* implementations, and other things that are not listed here that are
* related to nsIContentPolicy. */
//////////////////////////////////////////////////////////////////////
/**
* Returned from shouldLoad or shouldProcess if the load or process request
* is rejected based on details of the request.
*/
const short REJECT_REQUEST = -1;
/**
* Returned from shouldLoad or shouldProcess if the load/process is rejected
* based solely on its type (of the above flags).
*
* NOTE that it is not meant to stop future requests for this type--only the
* current request.
*/
const short REJECT_TYPE = -2;
/**
* Returned from shouldLoad or shouldProcess if the load/process is rejected
* based on the server it is hosted on or requested from (aContentLocation or
* aRequestOrigin), e.g., if you block an IMAGE because it is served from
* goatse.cx (even if you don't necessarily block other types from that
* server/domain).
*
* NOTE that it is not meant to stop future requests for this server--only the
* current request.
*/
const short REJECT_SERVER = -3;
/**
* Returned from shouldLoad or shouldProcess if the load/process is rejected
* based on some other criteria. Mozilla callers will handle this like
* REJECT_REQUEST; third-party implementors may, for example, use this to
* direct their own callers to consult the extra parameter for additional
* details.
*/
const short REJECT_OTHER = -4;
/**
* Returned from shouldLoad or shouldProcess if the load or process request
* is not rejected.
*/
const short ACCEPT = 1;
//////////////////////////////////////////////////////////////////////
/**
* 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);
};
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