//
//	aegis - project change supervisor
//	Copyright (C) 1999, 2001-2006, 2008 Peter Miller
//
//	This program is free software; you can redistribute it and/or modify
//	it under the terms of the GNU General Public License as published by
//	the Free Software Foundation; either version 3 of the License, or
//	(at your option) any later version.
//
//	This program is distributed in the hope that it will be useful,
//	but WITHOUT ANY WARRANTY; without even the implied warranty of
//	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//	GNU General Public License for more details.
//
//	You should have received a copy of the GNU General Public License
//	along with this program. If not, see
//	<http://www.gnu.org/licenses/>.
//

#include <common/str.h>
#include <libaegis/input/bunzip2.h>
#include <libaegis/input/base64.h>
#include <libaegis/input/cpio.h>
#include <libaegis/input/file.h>
#include <libaegis/input/gunzip.h>
#include <libaegis/input/uudecode.h>
#include <libaegis/os.h>
#include <libaegis/rfc822.h>
#include <libaegis/sub.h>

#include <aedist/open.h>


input_cpio *
aedist_open(const nstring &ifr, nstring *subject_p)
{
    //
    // Open the input file and verify the format.
    //
    os_become_orig();
    input ifp = input_file_open(ifr);
    rfc822 hdr;
    hdr.load(ifp, true);
    nstring s = hdr.get("mime-version");
    if (!s.empty())
    {
	s = hdr.get("content-type");
	if (s != "application/aegis-change-set")
	    ifp->fatal_error("wrong content type");
    }

    //
    // Deal with the content encoding.
    //
    s = hdr.get("content-transfer-encoding");
    if (!s.empty())
    {
	static nstring base64("base64");
	static nstring uuencode("uuencode");

	//
	// We could cope with other encodings here,
	// if we ever need to.
	//
	if (s == base64)
	{
	    //
	    // The rest of the input is in base64 encoding.
	    //
	    ifp = new input_base64(ifp);
	}
	else if (s == uuencode)
	{
	    //
	    // The rest of the input is uuencoded.
	    //
	    ifp = new input_uudecode(ifp);
	}
	else
	{
	    sub_context_ty sc;
	    sc.var_set_string("Name", s);
	    string_ty *tmp =
		sc.subst_intl(i18n("content transfer encoding $name unknown"));
	    ifp->fatal_error(tmp->str_text);
	    str_free(tmp);
	}
    }

    //
    // The contents we are interested in are
    // a gzipped cpio archive.
    //
    ifp = input_gunzip_open(ifp);
    ifp = input_bunzip2_open(ifp);
    input_cpio *cpio_p = new input_cpio(ifp);
    os_become_undo();

    //
    // Set the subject if they are interested.
    //
    if (subject_p)
    {
	s = hdr.get("subject");
	if (!s.empty())
	    *subject_p = s;
	else
	    *subject_p = "No Subject";
    }

    //
    // clean up and go home
    //
    return cpio_p;
}