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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "nsIProtocolHandler.idl"
+
+
+/**
+ * Protocol handler superinterface for a protocol which performs substitutions
+ * from URIs of its scheme to URIs of another scheme.
+ */
+[scriptable, uuid(154c64fd-a69e-4105-89f8-bd7dfe621372)]
+interface nsISubstitutingProtocolHandler : nsIProtocolHandler
+{
+ /**
+ * Content script may access files in this package.
+ */
+ const short ALLOW_CONTENT_ACCESS = 1 << 0;
+ /**
+ * This substitution exposes nsIJARURI instead of a nsIFileURL. By default
+ * NewURI will always return a nsIFileURL even when the URL is jar:
+ */
+ const short RESOLVE_JAR_URI = 1 << 1;
+
+ /**
+ * Sets the substitution for the root key:
+ * resource://root/path ==> baseURI.resolve(path)
+ *
+ * A null baseURI removes the specified substitution.
+ *
+ * The root key will be converted to lower-case to conform to
+ * case-insensitive URI hostname matching behavior.
+ */
+ [must_use] void setSubstitution(in ACString root, in nsIURI baseURI);
+
+ /**
+ * Same as setSubstitution, but with specific flags.
+ */
+ [must_use] void setSubstitutionWithFlags(in ACString root, in nsIURI baseURI, in uint32_t flags);
+
+ /**
+ * Gets the substitution for the root key.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if none exists.
+ */
+ [must_use] nsIURI getSubstitution(in ACString root);
+
+ /**
+ * Returns TRUE if the substitution exists and FALSE otherwise.
+ */
+ [must_use] boolean hasSubstitution(in ACString root);
+
+ /**
+ * Utility function to resolve a substituted URI. A resolved URI is not
+ * guaranteed to reference a resource that exists (ie. opening a channel to
+ * the resolved URI may fail).
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if resURI.host() is an unknown root key.
+ */
+ [must_use] AUTF8String resolveURI(in nsIURI resURI);
+};