/* -*- 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 nsILoadInfo;

/**
 * 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 : nsISupports
{
  /**
   * The type of nsIContentPolicy::TYPE_*
   */
  cenum nsContentPolicyType : 8 {
    /**
     * Indicates a unset or bogus policy type.
     */
    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.
     *
     * 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.
     *
     * Note that the TYPE_INTERNAL_* constants are never passed to content
     * policy implementations.  They are mapped to other TYPE_* constants, and
     * are only intended for internal usage inside Gecko.
     */
    TYPE_OTHER = 1,

    /**
     * Indicates an executable script (such as JavaScript).
     */
    TYPE_SCRIPT = 2,

    /**
     * Indicates an image (e.g., IMG elements).
     */
    TYPE_IMAGE = 3,

    /**
     * Indicates a stylesheet (e.g., STYLE elements).
     */
    TYPE_STYLESHEET = 4,

    /**
     * Indicates a generic object (plugin-handled content typically falls under
     * this category).
     */
    TYPE_OBJECT = 5,

    /**
     * Indicates a document at the top-level (i.e., in a browser).
     */
    TYPE_DOCUMENT = 6,

    /**
     * Indicates a document contained within another document (e.g., IFRAMEs,
     * FRAMES, and OBJECTs).
     */
    TYPE_SUBDOCUMENT = 7,

    /*
     * XXX: nsContentPolicyType = 8 used to indicate a timed refresh request.
     */

    /*
     * XXX: nsContentPolicyType = 9 used to indicate an XBL binding request.
     */

    /**
     * Indicates a ping triggered by a click on <A PING="..."> element.
     */
    TYPE_PING = 10,

    /**
     * Indicates an XMLHttpRequest. Also used for document.load and for EventSource.
     */
    TYPE_XMLHTTPREQUEST = 11,

    /*
     * XXX: nsContentPolicyType = 12 used to indicate plugin/object sub-requests.
     */

    /**
     * Indicates a DTD loaded by an XML document.
     */
    TYPE_DTD = 13,

    /**
     * Indicates a font loaded via @font-face rule.
     */
    TYPE_FONT = 14,

    /**
     * Indicates a video or audio load.
     */
    TYPE_MEDIA = 15,

    /**
     * Indicates a WebSocket load.
     */
    TYPE_WEBSOCKET = 16,

    /**
     * Indicates a Content Security Policy report.
     */
    TYPE_CSP_REPORT = 17,

    /**
     * Indicates a style sheet transformation.
     */
    TYPE_XSLT = 18,

    /**
     * Indicates a beacon post.
     */
    TYPE_BEACON = 19,

    /**
     * Indicates a load initiated by the fetch() function from the Fetch
     * specification.
     */
    TYPE_FETCH = 20,

    /**
     * Indicates a <img srcset> or <picture> request.
     */
    TYPE_IMAGESET = 21,

    /**
     * Indicates a web manifest.
     */
    TYPE_WEB_MANIFEST = 22,

    /**
     * Indicates an internal constant for scripts loaded through script
     * elements.
     *
     * This will be mapped to TYPE_SCRIPT before being passed to content policy
     * implementations.
     */
    TYPE_INTERNAL_SCRIPT = 23,

    /**
     * Indicates an internal constant for scripts loaded through a dedicated
     * worker.
     *
     * This will be mapped to TYPE_SCRIPT before being passed to content policy
     * implementations.
     */
    TYPE_INTERNAL_WORKER = 24,

    /**
     * Indicates an internal constant for scripts loaded through a shared
     * worker.
     *
     * This will be mapped to TYPE_SCRIPT before being passed to content policy
     * implementations.
     */
    TYPE_INTERNAL_SHARED_WORKER = 25,

    /**
     * Indicates an internal constant for content loaded from embed elements.
     *
     * This will be mapped to TYPE_OBJECT.
     */
    TYPE_INTERNAL_EMBED = 26,

    /**
     * Indicates an internal constant for content loaded from object elements.
     *
     * This will be mapped to TYPE_OBJECT.
     */
    TYPE_INTERNAL_OBJECT = 27,

    /**
     * Indicates an internal constant for content loaded from frame elements.
     *
     * This will be mapped to TYPE_SUBDOCUMENT.
     */
    TYPE_INTERNAL_FRAME = 28,

    /**
     * Indicates an internal constant for content loaded from iframe elements.
     *
     * This will be mapped to TYPE_SUBDOCUMENT.
     */
    TYPE_INTERNAL_IFRAME = 29,

    /**
     * Indicates an internal constant for content loaded from audio elements.
     *
     * This will be mapped to TYPE_MEDIA.
     */
    TYPE_INTERNAL_AUDIO = 30,

    /**
     * Indicates an internal constant for content loaded from video elements.
     *
     * This will be mapped to TYPE_MEDIA.
     */
    TYPE_INTERNAL_VIDEO = 31,

    /**
     * Indicates an internal constant for content loaded from track elements.
     *
     * This will be mapped to TYPE_MEDIA.
     */
    TYPE_INTERNAL_TRACK = 32,

    /**
     * Indicates an internal constant for an asynchronous XMLHttpRequest.
     *
     * This will be mapped to TYPE_XMLHTTPREQUEST.
     */
    TYPE_INTERNAL_XMLHTTPREQUEST_ASYNC = 33,

    /**
     * Indicates an internal constant for EventSource.
     *
     * This will be mapped to TYPE_XMLHTTPREQUEST.
     */
    TYPE_INTERNAL_EVENTSOURCE = 34,

    /**
     * Indicates an internal constant for scripts loaded through a service
     * worker.
     *
     * This will be mapped to TYPE_SCRIPT before being passed to content policy
     * implementations.
     */
    TYPE_INTERNAL_SERVICE_WORKER = 35,

    /**
     * Indicates an internal constant for *preloaded* scripts
     * loaded through script elements.
     *
     * This will be mapped to TYPE_SCRIPT before being passed
     * to content policy implementations.
     */
    TYPE_INTERNAL_SCRIPT_PRELOAD = 36,

    /**
     * Indicates an internal constant for normal images.
     *
     * This will be mapped to TYPE_IMAGE before being passed
     * to content policy implementations.
     */
    TYPE_INTERNAL_IMAGE = 37,

    /**
     * Indicates an internal constant for *preloaded* images.
     *
     * This will be mapped to TYPE_IMAGE before being passed
     * to content policy implementations.
     */
    TYPE_INTERNAL_IMAGE_PRELOAD = 38,

    /**
     * Indicates an internal constant for normal stylesheets.
     *
     * This will be mapped to TYPE_STYLESHEET before being passed
     * to content policy implementations.
     */
    TYPE_INTERNAL_STYLESHEET = 39,

    /**
     * Indicates an internal constant for *preloaded* stylesheets.
     *
     * This will be mapped to TYPE_STYLESHEET before being passed
     * to content policy implementations.
     */
    TYPE_INTERNAL_STYLESHEET_PRELOAD = 40,

    /**
     * Indicates an internal constant for favicon.
     *
     * This will be mapped to TYPE_IMAGE before being passed
     * to content policy implementations.
     */
    TYPE_INTERNAL_IMAGE_FAVICON = 41,

    /**
     * Indicates an importScripts() inside a worker script.
     *
     * This will be mapped to TYPE_SCRIPT before being passed to content policy
     * implementations.
     */
    TYPE_INTERNAL_WORKER_IMPORT_SCRIPTS = 42,

    /**
     * Indicates an save-as link download from the front-end code.
     */
    TYPE_SAVEAS_DOWNLOAD = 43,

    /**
     * Indicates a speculative connection.
     */
    TYPE_SPECULATIVE = 44,

    /**
     * Indicates an internal constant for ES6 module scripts
     * loaded through script elements or an import statement (static import) or
     * an import expression (dynamic import).
     * It also indicates the load for dynamic import in workers.
     * For static import in module workers,
     * please check TYPE_INTERNAL_WORKER_STATIC_MODULE.
     *
     * This will be mapped to TYPE_SCRIPT before being passed
     * to content policy implementations.
     */
    TYPE_INTERNAL_MODULE = 45,

    /**
     * Indicates an internal constant for *preloaded* ES6 module scripts
     * loaded through script elements or an import statement.
     *
     * This will be mapped to TYPE_SCRIPT before being passed
     * to content policy implementations.
     */
    TYPE_INTERNAL_MODULE_PRELOAD = 46,

    /**
     * Indicates a DTD loaded by an XML document the URI of which could
     * not be mapped to a known local DTD.
     */
    TYPE_INTERNAL_DTD = 47,

    /**
     * Indicates a TYPE_INTERNAL_DTD which will not be blocked no matter
     * what principal is being loaded from.
     */
    TYPE_INTERNAL_FORCE_ALLOWED_DTD = 48,

    /**
     * Indicates an internal constant for scripts loaded through an
     * audioWorklet.
     *
     * This will be mapped to TYPE_SCRIPT before being passed to content policy
     * implementations.
     */
    TYPE_INTERNAL_AUDIOWORKLET = 49,

    /**
     * Indicates an internal constant for scripts loaded through an
     * paintWorklet.
     *
     * This will be mapped to TYPE_SCRIPT before being passed to content policy
     * implementations.
     */
    TYPE_INTERNAL_PAINTWORKLET = 50,

    /**
     * Same as TYPE_FONT but indicates this is a <link rel=preload as=font>
     * preload initiated load.
     */
    TYPE_INTERNAL_FONT_PRELOAD = 51,

    /**
     * Indicates the load of a (Firefox-internal) script through ChromeUtils
     *
     * This will be mapped to TYPE_SCRIPT before being passed to content policy
     * implementations.
    */
    TYPE_INTERNAL_CHROMEUTILS_COMPILED_SCRIPT = 52,

    /**
     * Indicates the load of a script through FrameMessageManager
     *
     * This will be mapped to TYPE_SCRIPT before being passed to content policy
     * implementations.
    */
    TYPE_INTERNAL_FRAME_MESSAGEMANAGER_SCRIPT = 53,

    /**
     * Indicates an internal constant for *preloaded* fetch
     * loaded through link elements.
     *
     * This will be mapped to TYPE_FETCH before being passed
     * to content policy implementations.
     */
    TYPE_INTERNAL_FETCH_PRELOAD = 54,

    /**
     * Indicates a font loaded via @font-face rule in an UA style sheet.
     * (CSP does not apply.)
     */
    TYPE_UA_FONT = 55,

    /**
     * Indicates the establishment of a TCP or TLS connection via an
     * http/https proxy that will be used for webrtc media. When no web proxy
     * is involved, webrtc uses lower level sockets that are not subject to
     * any sort of content policy.
     */
    TYPE_PROXIED_WEBRTC_MEDIA = 56,

    /**
     * Indicates the load of data via the Federated Credential Management API
     * with data destined for a browser context.
     */
     TYPE_WEB_IDENTITY = 57,

    /**
     * Indicates the load of a static module on workers.
     */
    TYPE_INTERNAL_WORKER_STATIC_MODULE = 58,

    /**
     * Indicates Webtransport request
     */
    TYPE_WEB_TRANSPORT = 59,

    /**
     * Indicates an internal constant for a synchronous XMLHttpRequest.
     *
     * This will be mapped to TYPE_XMLHTTPREQUEST.
     */
    TYPE_INTERNAL_XMLHTTPREQUEST_SYNC = 60,

    /**
     * This is a request triggered by Document::RequestExternalResource.
     * It is presumably something like an SVG <use> or CSS filter:.
     * For simplicity treat this like TYPE_OTHER outside CSP.
     */
    TYPE_INTERNAL_EXTERNAL_RESOURCE = 61,

    /**
     * Indicates a JSON module loaded through an import statement.
     */
    TYPE_JSON = 62,

    /**
     * Same as TYPE_JSON but indicates an internal constant for a preloaded
     * JSON module loaded through an import statement.
     *
     * This will be mapped to TYPE_JSON before being passed to content policy
     * implementations.
     */
    TYPE_INTERNAL_JSON_PRELOAD = 63,

    /**
     * Used to indicate the end of this list, not a content policy. If you want
     * to add a new content policy type, place it before this sentinel value
     * TYPE_END, have it use TYPE_END's current value, and increment TYPE_END by
     * one. (TYPE_END should always have the highest numerical value.)
     */
    TYPE_END = 64,

    /* When adding new content types, please update
     * NS_CP_ContentTypeName, nsCSPContext, CSP_ContentTypeToDirective,
     * DoContentSecurityChecks, all nsIContentPolicy implementations, the
     * static_assert in dom/cache/DBSchema.cpp, ChannelWrapper.webidl,
     * ChannelWrapper.cpp, PermissionManager.cpp,
     * IPCMessageUtilsSpecializations.h, 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/process is forbiddden
   * based on enterprise policy.
   */
  const short REJECT_POLICY = -5;

  /**
   * 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 aContentLocation  the location of the content being checked; must
   *                          not be null
   *
   * @param aLoadInfo         the loadinfo of the channel being evaluated.
   *
   * @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 nsIURI      aContentLocation,
                   in nsILoadInfo aLoadInfo);

  /**
   * 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 aContentLocation  OPTIONAL; the location of the resource being
   *                          requested: MAY be, e.g., a post-redirection URI
   *                          for the resource.
   *
   * @param aLoadInfo         the loadinfo of the channel being evaluated.
   *
   * @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 nsIURI      aContentLocation,
                      in nsILoadInfo aLoadInfo);
};

typedef nsIContentPolicy_nsContentPolicyType nsContentPolicyType;

%{C++
enum class ExtContentPolicyType : uint8_t {
  /**
   * The type of ExtContentPolicy::TYPE_*
   */
  TYPE_INVALID = nsIContentPolicy::TYPE_INVALID,
  TYPE_OTHER = nsIContentPolicy::TYPE_OTHER,
  TYPE_SCRIPT = nsIContentPolicy::TYPE_SCRIPT,
  TYPE_IMAGE = nsIContentPolicy::TYPE_IMAGE,
  TYPE_STYLESHEET = nsIContentPolicy::TYPE_STYLESHEET,
  TYPE_OBJECT = nsIContentPolicy::TYPE_OBJECT,
  TYPE_DOCUMENT = nsIContentPolicy::TYPE_DOCUMENT,
  TYPE_SUBDOCUMENT = nsIContentPolicy::TYPE_SUBDOCUMENT,
  TYPE_PING = nsIContentPolicy::TYPE_PING,
  TYPE_XMLHTTPREQUEST = nsIContentPolicy::TYPE_XMLHTTPREQUEST,
  TYPE_DTD = nsIContentPolicy::TYPE_DTD,
  TYPE_FONT = nsIContentPolicy::TYPE_FONT,
  TYPE_MEDIA = nsIContentPolicy::TYPE_MEDIA,
  TYPE_WEBSOCKET = nsIContentPolicy::TYPE_WEBSOCKET,
  TYPE_CSP_REPORT = nsIContentPolicy::TYPE_CSP_REPORT,
  TYPE_XSLT = nsIContentPolicy::TYPE_XSLT,
  TYPE_BEACON = nsIContentPolicy::TYPE_BEACON,
  TYPE_FETCH = nsIContentPolicy::TYPE_FETCH,
  TYPE_IMAGESET = nsIContentPolicy::TYPE_IMAGESET,
  TYPE_WEB_MANIFEST = nsIContentPolicy::TYPE_WEB_MANIFEST,
  TYPE_SAVEAS_DOWNLOAD = nsIContentPolicy::TYPE_SAVEAS_DOWNLOAD,
  TYPE_SPECULATIVE = nsIContentPolicy::TYPE_SPECULATIVE,
  TYPE_UA_FONT = nsIContentPolicy::TYPE_UA_FONT,
  TYPE_PROXIED_WEBRTC_MEDIA = nsIContentPolicy::TYPE_PROXIED_WEBRTC_MEDIA,
  TYPE_WEB_IDENTITY = nsIContentPolicy::TYPE_WEB_IDENTITY,
  TYPE_WEB_TRANSPORT = nsIContentPolicy::TYPE_WEB_TRANSPORT,
  TYPE_JSON = nsIContentPolicy::TYPE_JSON,
};

typedef ExtContentPolicyType ExtContentPolicy;
%}