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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim:set ts=4 sw=4 sts=4 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"
+
+interface nsIChannel;
+interface nsIAsyncVerifyRedirectCallback;
+
+/**
+ * Implement this interface to receive control over various channel events.
+ * Channels will try to get this interface from a channel's
+ * notificationCallbacks or, if not available there, from the loadGroup's
+ * notificationCallbacks.
+ *
+ * These methods are called before onStartRequest.
+ */
+[scriptable, uuid(0197720d-37ed-4e75-8956-d0d296e4d8a6)]
+interface nsIChannelEventSink : nsISupports
+{
+ /**
+ * This is a temporary redirect. New requests for this resource should
+ * continue to use the URI of the old channel.
+ *
+ * The new URI may be identical to the old one.
+ */
+ const unsigned long REDIRECT_TEMPORARY = 1 << 0;
+
+ /**
+ * This is a permanent redirect. New requests for this resource should use
+ * the URI of the new channel (This might be an HTTP 301 reponse).
+ * If this flag is not set, this is a temporary redirect.
+ *
+ * The new URI may be identical to the old one.
+ */
+ const unsigned long REDIRECT_PERMANENT = 1 << 1;
+
+ /**
+ * This is an internal redirect, i.e. it was not initiated by the remote
+ * server, but is specific to the channel implementation.
+ *
+ * The new URI may be identical to the old one.
+ */
+ const unsigned long REDIRECT_INTERNAL = 1 << 2;
+
+ /**
+ * This is a special-cased redirect coming from hitting HSTS upgrade
+ * redirect from http to https only. In some cases this type of redirect
+ * may be considered as safe despite not being the-same-origin redirect.
+ */
+ const unsigned long REDIRECT_STS_UPGRADE = 1 << 3;
+
+ /**
+ * Called when a redirect occurs. This may happen due to an HTTP 3xx status
+ * code. The purpose of this method is to notify the sink that a redirect
+ * is about to happen, but also to give the sink the right to veto the
+ * redirect by throwing or passing a failure-code in the callback.
+ *
+ * Note that vetoing the redirect simply means that |newChannel| will not
+ * be opened. It is important to understand that |oldChannel| will continue
+ * loading as if it received a HTTP 200, which includes notifying observers
+ * and possibly display or process content attached to the HTTP response.
+ * If the sink wants to prevent this loading it must explicitly deal with
+ * it, e.g. by calling |oldChannel->Cancel()|
+ *
+ * There is a certain freedom in implementing this method:
+ *
+ * If the return-value indicates success, a callback on |callback| is
+ * required. This callback can be done from within asyncOnChannelRedirect
+ * (effectively making the call synchronous) or at some point later
+ * (making the call asynchronous). Repeat: A callback must be done
+ * if this method returns successfully.
+ *
+ * If the return value indicates error (method throws an exception)
+ * the redirect is vetoed and no callback must be done. Repeat: No
+ * callback must be done if this method throws!
+ *
+ * @see nsIAsyncVerifyRedirectCallback::onRedirectVerifyCallback()
+ *
+ * @param oldChannel
+ * The channel that's being redirected.
+ * @param newChannel
+ * The new channel. This channel is not opened yet.
+ * @param flags
+ * Flags indicating the type of redirect. A bitmask consisting
+ * of flags from above.
+ * One of REDIRECT_TEMPORARY and REDIRECT_PERMANENT will always be
+ * set.
+ * @param callback
+ * Object to inform about the async result of this method
+ *
+ * @throw <any> Throwing an exception will cause the redirect to be
+ * cancelled
+ */
+ void asyncOnChannelRedirect(in nsIChannel oldChannel,
+ in nsIChannel newChannel,
+ in unsigned long flags,
+ in nsIAsyncVerifyRedirectCallback callback);
+};