/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or 
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * the provisions above, a recipient may use your version of this file under
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 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

interface nsIURI;
interface nsIChannel;

/**
 * nsIProtocolHandler
 *
 * @status FROZEN
 */
[scriptable, uuid(15fd6940-8ea7-11d3-93ad-00104ba0fd40)]
interface nsIProtocolHandler : nsISupports
{
    /**
     * The scheme of this protocol (e.g., "file").
     */
    readonly attribute ACString scheme;

    /** 
     * The default port is the port that this protocol normally uses.
     * If a port does not make sense for the protocol (e.g., "about:")
     * then -1 will be returned.
     */
    readonly attribute long defaultPort;

    /**
     * Returns the protocol specific flags (see flag definitions below).  
     */
    readonly attribute unsigned long protocolFlags;

    /**
     * Makes a URI object that is suitable for loading by this protocol,
     * where the URI string is given as an UTF-8 string.  The caller may
     * provide the charset from which the URI string originated, so that
     * the URI string can be translated back to that charset (if necessary)
     * before communicating with, for example, the origin server of the URI
     * string.  (Many servers do not support UTF-8 IRIs at the present time,
     * so we must be careful about tracking the native charset of the origin
     * server.)
     *
     * @param aSpec          - the URI string in UTF-8 encoding. depending
     *                         on the protocol implementation, unicode character
     *                         sequences may or may not be %xx escaped.
     * @param aOriginCharset - the charset of the document from which this URI
     *                         string originated.  this corresponds to the
     *                         charset that should be used when communicating
     *                         this URI to an origin server, for example.  if
     *                         null, then UTF-8 encoding is assumed (i.e.,
     *                         no charset transformation from aSpec).
     * @param aBaseURI       - if null, aSpec must specify an absolute URI.
     *                         otherwise, aSpec may be resolved relative
     *                         to aBaseURI, depending on the protocol. 
     *                         If the protocol has no concept of relative 
     *                         URI aBaseURI will simply be ignored.
     */
    nsIURI newURI(in AUTF8String aSpec,
                  in string aOriginCharset,
                  in nsIURI aBaseURI);

    /**
     * Constructs a new channel from the given URI for this protocol handler. 
     */
    nsIChannel newChannel(in nsIURI aURI);

    /**
     * Allows a protocol to override blacklisted ports.
     *
     * This method will be called when there is an attempt to connect to a port 
     * that is blacklisted.  For example, for most protocols, port 25 (Simple Mail
     * Transfer) is banned.  When a URI containing this "known-to-do-bad-things" 
     * port number is encountered, this function will be called to ask if the 
     * protocol handler wants to override the ban.  
     */
    boolean allowPort(in long port, in string scheme);


    /**************************************************************************
     * Constants for the protocol flags (the first is the default mask, the
     * others are deviations):
     *
     * NOTE: Implementation must ignore any flags they do not understand.
     */

    /**
     * standard full URI with authority component and concept of relative
     * URIs (http, ftp, ...)
     */
    const unsigned long URI_STD = 0;

    /**
     * no concept of relative URIs (about, javascript, finger, ...)
     */
    const unsigned long URI_NORELATIVE = (1<<0);

    /**
     * no authority component (file, ...)
     */
    const unsigned long URI_NOAUTH = (1<<1);

    /**
     * This protocol handler can be proxied via a proxy (socks or http)
     * (e.g., irc, smtp, http, etc.).  If the protocol supports transparent
     * proxying, the handler should implement nsIProxiedProtocolHandler.
     *
     * If it supports only HTTP proxying, then it need not support
     * nsIProxiedProtocolHandler, but should instead set the ALLOWS_PROXY_HTTP
     * flag (see below).
     *
     * @see nsIProxiedProtocolHandler
     */
    const unsigned long ALLOWS_PROXY = (1<<2);

    /**
     * This protocol handler can be proxied using a http proxy (e.g., http,
     * ftp, etc.).  nsIIOService::newChannelFromURI will feed URIs from this
     * protocol handler to the HTTP protocol handler instead.  This flag is
     * ignored if ALLOWS_PROXY is not set.
     */
    const unsigned long ALLOWS_PROXY_HTTP = (1<<3);
};

%{C++
/**
 * Protocol handlers are registered with XPCOM under the following CONTRACTID prefix:
 */
#define NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "@mozilla.org/network/protocol;1?name="
/**
 * For example, "@mozilla.org/network/protocol;1?name=http"
 */
%}
