/* -*- 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 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(344f9cb0-9a17-44c5-ab96-ee707884266c)] interface nsIContentPolicy : nsISupports { const unsigned long TYPE_OTHER = 1; /** * Indicates an executable script (such as JavaScript). */ const unsigned long TYPE_SCRIPT = 2; /** * Indicates an image (e.g., IMG elements). */ const unsigned long TYPE_IMAGE = 3; /** * Indicates a stylesheet (e.g., STYLE elements). */ const unsigned long TYPE_STYLESHEET = 4; /** * Indicates a generic object (plugin-handled content typically falls under * this category). */ const unsigned long TYPE_OBJECT = 5; /** * Indicates a document at the top-level (i.e., in a browser). */ const unsigned long TYPE_DOCUMENT = 6; /** * Indicates a document contained within another document (e.g., IFRAMEs, * FRAMES, and OBJECTs). */ const unsigned long 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 unsigned long TYPE_REFRESH = 8; /** * Indicates an XBL binding request, triggered either by -moz-binding CSS * property or Document.addBinding method. */ const unsigned long TYPE_XBL = 9; /** * Indicates a ping triggered by a click on element. */ const unsigned long TYPE_PING = 10; /** * Indicates an XMLHttpRequest. Also used for document.load and for EventSource. */ const unsigned long TYPE_XMLHTTPREQUEST = 11; const unsigned long TYPE_DATAREQUEST = 11; // alias /** * Indicates a request by a plugin. */ const unsigned long TYPE_OBJECT_SUBREQUEST = 12; /** * Indicates a DTD loaded by an XML document. */ const unsigned long TYPE_DTD = 13; /** * Indicates a font loaded via @font-face rule. */ const unsigned long TYPE_FONT = 14; /** * Indicates a video or audio load. */ const unsigned long TYPE_MEDIA = 15; /** * Indicates a WebSocket load. */ const unsigned long TYPE_WEBSOCKET = 16; /* Please update nsContentBlocker when adding new content types. */ ////////////////////////////////////////////////////////////////////// /** * 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. * * @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. * * @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 unsigned long aContentType, in nsIURI aContentLocation, in nsIURI aRequestOrigin, in nsISupports aContext, in ACString aMimeTypeGuess, in nsISupports aExtra); /** * 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 unsigned long aContentType, in nsIURI aContentLocation, in nsIURI aRequestOrigin, in nsISupports aContext, in ACString aMimeType, in nsISupports aExtra); };