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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+/* 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 mozIDOMWindowProxy;
+interface nsIChannel;
+
+/**
+ * Utility functions for determining whether a given URI, channel, or window
+ * hierarchy is third party with respect to a known URI.
+ */
+[scriptable, uuid(fd82700e-ffb4-4932-b7d6-08f0b5697dda)]
+interface mozIThirdPartyUtil : nsISupports
+{
+ /**
+ * isThirdPartyURI
+ *
+ * Determine whether two URIs are third party with respect to each other.
+ * This is determined by computing the base domain for both URIs. If they can
+ * be determined, and the base domains match, the request is defined as first
+ * party. If it cannot be determined because one or both URIs do not have a
+ * base domain (for instance, in the case of IP addresses, host aliases such
+ * as 'localhost', or a file:// URI), an exact string comparison on host is
+ * performed.
+ *
+ * For example, the URI "http://mail.google.com/" is not third party with
+ * respect to "http://images.google.com/", but "http://mail.yahoo.com/" and
+ * "http://192.168.1.1/" are.
+ *
+ * @return true if aFirstURI is third party with respect to aSecondURI.
+ *
+ * @throws if either URI is null, has a malformed host, or has an empty host
+ * and is not a file:// URI.
+ */
+ boolean isThirdPartyURI(in nsIURI aFirstURI, in nsIURI aSecondURI);
+
+ /**
+ * isThirdPartyWindow
+ *
+ * Determine whether the given window hierarchy is third party. This is done
+ * as follows:
+ *
+ * 1) Obtain the URI of the principal associated with 'aWindow'. Call this the
+ * 'bottom URI'.
+ * 2) If 'aURI' is provided, determine if it is third party with respect to
+ * the bottom URI. If so, return.
+ * 3) Find the same-type parent window, if there is one, and its URI.
+ * Determine whether it is third party with respect to the bottom URI. If
+ * so, return.
+ *
+ * Therefore, each level in the window hierarchy is tested. (This means that
+ * nested iframes with different base domains, even though the bottommost and
+ * topmost URIs might be equal, will be considered third party.)
+ *
+ * @param aWindow
+ * The bottommost window in the hierarchy.
+ * @param aURI
+ * A URI to test against. If null, the URI of the principal
+ * associated with 'aWindow' will be used.
+ *
+ * For example, if 'aURI' is "http://mail.google.com/", 'aWindow' has a URI
+ * of "http://google.com/", and its parent is the topmost content window with
+ * a URI of "http://mozilla.com", the result will be true.
+ *
+ * @return true if 'aURI' is third party with respect to any of the URIs
+ * associated with aWindow and its same-type parents.
+ *
+ * @throws if aWindow is null; the same-type parent of any window in the
+ * hierarchy cannot be determined; or the URI associated with any
+ * window in the hierarchy is null, has a malformed host, or has an
+ * empty host and is not a file:// URI.
+ *
+ * @see isThirdPartyURI
+ */
+ boolean isThirdPartyWindow(in mozIDOMWindowProxy aWindow, [optional] in nsIURI aURI);
+
+ /**
+ * isThirdPartyChannel
+ *
+ * Determine whether the given channel and its content window hierarchy is
+ * third party. This is done as follows:
+ *
+ * 1) If 'aChannel' is an nsIHttpChannel and has the
+ * 'forceAllowThirdPartyCookie' property set, then:
+ * a) If 'aURI' is null, return false.
+ * b) Otherwise, find the URI of the channel, determine whether it is
+ * foreign with respect to 'aURI', and return.
+ * 2) Find the URI of the channel and determine whether it is third party with
+ * respect to the URI of the channel. If so, return.
+ * 3) Obtain the bottommost nsIDOMWindow, and its same-type parent if it
+ * exists, from the channel's notification callbacks. Then:
+ * a) If the parent is the same as the bottommost window, and the channel
+ * has the LOAD_DOCUMENT_URI flag set, return false. This represents the
+ * case where a toplevel load is occurring and the window's URI has not
+ * yet been updated. (We have already checked that 'aURI' is not foreign
+ * with respect to the channel URI.)
+ * b) Otherwise, return the result of isThirdPartyWindow with arguments
+ * of the channel's bottommost window and the channel URI, respectively.
+ *
+ * Therefore, both the channel's URI and each level in the window hierarchy
+ * associated with the channel is tested.
+ *
+ * @param aChannel
+ * The channel associated with the load.
+ * @param aURI
+ * A URI to test against. If null, the URI of the channel will be used.
+ *
+ * For example, if 'aURI' is "http://mail.google.com/", 'aChannel' has a URI
+ * of "http://google.com/", and its parent is the topmost content window with
+ * a URI of "http://mozilla.com", the result will be true.
+ *
+ * @return true if aURI is third party with respect to the channel URI or any
+ * of the URIs associated with the same-type window hierarchy of the
+ * channel.
+ *
+ * @throws if 'aChannel' is null; the channel has no notification callbacks or
+ * an associated window; or isThirdPartyWindow throws.
+ *
+ * @see isThirdPartyWindow
+ */
+ boolean isThirdPartyChannel(in nsIChannel aChannel, [optional] in nsIURI aURI);
+
+ /**
+ * getBaseDomain
+ *
+ * Get the base domain for aHostURI; e.g. for "www.bbc.co.uk", this would be
+ * "bbc.co.uk". Only properly-formed URI's are tolerated, though a trailing
+ * dot may be present. If aHostURI is an IP address, an alias such as
+ * 'localhost', an eTLD such as 'co.uk', or the empty string, aBaseDomain will
+ * be the exact host. The result of this function should only be used in exact
+ * string comparisons, since substring comparisons will not be valid for the
+ * special cases elided above.
+ *
+ * @param aHostURI
+ * The URI to analyze.
+ *
+ * @return the base domain.
+ */
+ AUTF8String getBaseDomain(in nsIURI aHostURI);
+
+ /**
+ * getURIFromWindow
+ *
+ * Returns the URI associated with the script object principal for the
+ * window.
+ */
+ nsIURI getURIFromWindow(in mozIDOMWindowProxy aWindow);
+
+ /**
+ * getTopWindowForChannel
+ *
+ * Returns the top-level window associated with the given channel.
+ */
+ mozIDOMWindowProxy getTopWindowForChannel(in nsIChannel aChannel);
+};
+
+%{ C++
+/**
+ * The mozIThirdPartyUtil implementation is an XPCOM service registered
+ * under the ContractID:
+ */
+#define THIRDPARTYUTIL_CONTRACTID "@mozilla.org/thirdpartyutil;1"
+%}
+