/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:set ts=4 sw=4 sts=4 et: */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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):
 *   Chak Nanga <chak@netscape.com>
 *   Darin Fisher <darin@meer.net>
 *
 * 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
 * of those above. If you wish to allow use of your version of this file only
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 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsViewSourceHandler.h"
#include "nsViewSourceChannel.h"
#include "nsNetUtil.h"
#include "nsSimpleNestedURI.h"

#define VIEW_SOURCE "view-source"

////////////////////////////////////////////////////////////////////////////////

NS_IMPL_ISUPPORTS1(nsViewSourceHandler, nsIProtocolHandler)

////////////////////////////////////////////////////////////////////////////////
// nsIProtocolHandler methods:

NS_IMETHODIMP
nsViewSourceHandler::GetScheme(nsACString &result)
{
    result.AssignLiteral(VIEW_SOURCE);
    return NS_OK;
}

NS_IMETHODIMP
nsViewSourceHandler::GetDefaultPort(PRInt32 *result)
{
    *result = -1;
    return NS_OK;
}

NS_IMETHODIMP
nsViewSourceHandler::GetProtocolFlags(PRUint32 *result)
{
    *result = URI_NORELATIVE | URI_NOAUTH | URI_LOADABLE_BY_ANYONE |
        URI_NON_PERSISTABLE;
    return NS_OK;
}

NS_IMETHODIMP
nsViewSourceHandler::NewURI(const nsACString &aSpec,
                            const char *aCharset,
                            nsIURI *aBaseURI,
                            nsIURI **aResult)
{
    *aResult = nsnull;

    // Extract inner URL and normalize to ASCII.  This is done to properly
    // support IDN in cases like "view-source:http://www.szalagavató.hu/"

    PRInt32 colon = aSpec.FindChar(':');
    if (colon == kNotFound)
        return NS_ERROR_MALFORMED_URI;

    nsCOMPtr<nsIURI> innerURI;
    nsresult rv = NS_NewURI(getter_AddRefs(innerURI),
                            Substring(aSpec, colon + 1), aCharset, aBaseURI);
    if (NS_FAILED(rv))
        return rv;

    nsCAutoString asciiSpec;
    rv = innerURI->GetAsciiSpec(asciiSpec);
    if (NS_FAILED(rv))
        return rv;

    // put back our scheme and construct a simple-uri wrapper

    asciiSpec.Insert(VIEW_SOURCE ":", 0);

    // We can't swap() from an nsRefPtr<nsSimpleNestedURI> to an nsIURI**,
    // sadly.
    nsSimpleNestedURI* ourURI = new nsSimpleNestedURI(innerURI);
    nsCOMPtr<nsIURI> uri = ourURI;
    if (!uri)
        return NS_ERROR_OUT_OF_MEMORY;

    rv = ourURI->SetSpec(asciiSpec);
    if (NS_FAILED(rv))
        return rv;

    // Make the URI immutable so it's impossible to get it out of sync
    // with its inner URI.
    ourURI->SetMutable(PR_FALSE);

    uri.swap(*aResult);
    return rv;
}

NS_IMETHODIMP
nsViewSourceHandler::NewChannel(nsIURI* uri, nsIChannel* *result)
{
    NS_ENSURE_ARG_POINTER(uri);
    nsViewSourceChannel *channel = new nsViewSourceChannel();
    if (!channel)
        return NS_ERROR_OUT_OF_MEMORY;
    NS_ADDREF(channel);

    nsresult rv = channel->Init(uri);
    if (NS_FAILED(rv)) {
        NS_RELEASE(channel);
        return rv;
    }

    *result = static_cast<nsIViewSourceChannel*>(channel);
    return NS_OK;
}

NS_IMETHODIMP 
nsViewSourceHandler::AllowPort(PRInt32 port, const char *scheme, PRBool *_retval)
{
    // don't override anything.  
    *_retval = PR_FALSE;
    return NS_OK;
}