1 files changed, 104 insertions, 0 deletions
diff --git a/netwerk/base/nsIChannelEventSink.idl b/netwerk/base/nsIChannelEventSink.idl
new file mode 100644
index 0000000000..1f77cfb466
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+++ b/netwerk/base/nsIChannelEventSink.idl
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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!
+     *
+     * NOTE: originalURI isn't yet set on the new channel when
+     * asyncOnChannelRedirect is called.
+     *
+     * @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);
+};