/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: ft=cpp tw=78 sw=2 et ts=2 sts=2 cin
 * 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 "nsIContentPolicy.idl"

interface nsIDOMDocument;
interface nsINode;
interface nsIPrincipal;
interface nsIURI;

typedef unsigned long nsSecurityFlags;

/**
 * An nsILoadOwner represents per-load information about who started the load.
 */
[scriptable, builtinclass, uuid(768a1f20-57d4-462a-812a-41c04e5d1e19)]
interface nsILoadInfo : nsISupports
{
  /**
   * No special security flags:
   */
  const unsigned long SEC_NORMAL = 0;

  /**
   * Force inheriting of the Principal. The resulting resource will use the
   * principal of the document which is doing the load. Setting this flag
   * will cause GetChannelResultPrincipal to return the same principal as
   * the loading principal that's passed in when creating the channel.
   *
   * This will happen independently of the scheme of the URI that the
   * channel is loading.
   *
   * So if the loading document comes from "http://a.com/", and the channel
   * is loading the URI "http://b.com/whatever", GetChannelResultPrincipal
   * will return a principal from "http://a.com/".
   *
   * This flag can not be used together with SEC_SANDBOXED.
   */
  const unsigned long SEC_FORCE_INHERIT_PRINCIPAL = 0x01;

  /**
   * Sandbox the load. The resulting resource will use a freshly created
   * null principal. So GetChannelResultPrincipal will always return a
   * null principal whenever this flag is set.
   *
   * This will happen independently of the scheme of the URI that the
   * channel is loading.
   *
   * This flag can not be used together with SEC_FORCE_INHERIT_PRINCIPAL.
   */
  const unsigned long SEC_SANDBOXED = 0x02;

  /**
   * The loadingPrincipal is the principal that is responsible for the load.
   * It is *NOT* the principal tied to the resource/URI that this
   * channel is loading, it's the principal of the resource's
   * caller or requester. For example, if this channel is loading
   * an image from http://b.com that is embedded in a document
   * who's origin is http://a.com, the loadingPrincipal is http://a.com.
   *
   * The loadingPrincipal will never be null.
   */
  readonly attribute nsIPrincipal loadingPrincipal;

  /**
   * A C++-friendly version of loadingPrincipal.
   */
  [noscript, notxpcom, nostdcall, binaryname(LoadingPrincipal)]
  nsIPrincipal binaryLoadingPrincipal();

  /**
   * The triggeringPrincipal is the principal that triggerd the load.
   * Most likely the triggeringPrincipal and the loadingPrincipal are the same,
   * in which case triggeringPrincipal returns the loadingPrincipal.
   * In some cases the loadingPrincipal and the triggeringPrincipal are different
   * however, e.g. a stylesheet may import a subresource. In that case the
   * stylesheet principal is the triggeringPrincipal and the document that loads
   * the stylesheet provides a loadingContext and hence the loadingPrincipal.
   *
   * If triggeringPrincipal and loadingPrincipal are the same, then
   * triggeringPrincipal returns loadingPrincipal.
   */
  readonly attribute nsIPrincipal triggeringPrincipal;

  /**
   * A C++-friendly version of triggeringPrincipal.
   */
  [noscript, notxpcom, nostdcall, binaryname(TriggeringPrincipal)]
  nsIPrincipal binaryTriggeringPrincipal();

  /**
   * The loadingDocument of the channel.
   *
   * The loadingDocument of a channel is the document that requested the
   * load of the resource. It is *not* the resource itself, it's the
   * resource's caller or requester in which the load is happening.
   *
   * <script> example: Assume a document who's origin is http://a.com embeds
   * a script from http://b.com. The loadingDocument for the channel
   * associated with the http://b.com script load is the document with origin
   * http://a.com
   *
   * <iframe> example: Assume a document with origin http://a.com embeds
   * <iframe src="http://b.com">. The loadingDocument for the channel associated
   * with the http://b.com network request is the document who's origin is
   * http://a.com. Now assume the iframe to http://b.com then further embeds
   * <script src="http://c.com">. The loadingDocument for the channel associated
   * with the http://c.com network request is the iframe with origin http://b.com.
   *
   * Warning: The loadingDocument can be null!
   */
  readonly attribute nsIDOMDocument loadingDocument;

  /**
   * A C++-friendly version of loadingDocument (loadingNode).
   * This is the node most proximally responsible for the load.
   */
  [noscript, notxpcom, nostdcall, binaryname(LoadingNode)]
  nsINode binaryLoadingNode();

  /**
   * The securityFlags of that channel.
   */
  readonly attribute nsSecurityFlags securityFlags;

%{ C++
  inline nsSecurityFlags GetSecurityFlags()
  {
    nsSecurityFlags result;
    mozilla::DebugOnly<nsresult> rv = GetSecurityFlags(&result);
    MOZ_ASSERT(NS_SUCCEEDED(rv));
    return result;
  }
%}

  /**
   * If forceInheritPrincipal is true, the data coming from the channel should
   * use loadingPrincipal for its principal, even when the data is loaded over
   * http:// or another protocol that would normally use a URI-based principal.
   * This attribute will never be true when loadingSandboxed is true.
   */
  [infallible] readonly attribute boolean forceInheritPrincipal;

  /**
   * If loadingSandboxed is true, the data coming from the channel is
   * being loaded sandboxed, so it should have a nonce origin and
   * hence should use a NullPrincipal.
   */
  [infallible] readonly attribute boolean loadingSandboxed;

  /**
   * The contentPolicyType of the channel, used for security checks
   * like Mixed Content Blocking and Content Security Policy.
   */
  readonly attribute nsContentPolicyType contentPolicyType;

%{ C++
  inline nsContentPolicyType GetContentPolicyType()
  {
    nsContentPolicyType result;
    mozilla::DebugOnly<nsresult> rv = GetContentPolicyType(&result);
    MOZ_ASSERT(NS_SUCCEEDED(rv));
    return result;
  }
%}

  /**
   * A base URI for use in situations where it cannot otherwise be inferred.
   * This attribute may be null.  The value of this attribute may be
   * ignored if the base URI can be inferred by the channel's URI.
   */
  readonly attribute nsIURI baseURI;

  /**
   * A C++-friendly version of baseURI.
   */
  [noscript, notxpcom, nostdcall, binaryname(BaseURI)]
  nsIURI binaryBaseURI();
};
