/* ====================================================================
 * Copyright (c) 1995 The Apache Group.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the Apache Group
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * 4. The names "Apache Server" and "Apache Group" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission.
 *
 * 5. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the Apache Group
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE APACHE GROUP OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Group and was originally based
 * on public domain software written at the National Center for
 * Supercomputing Applications, University of Illinois, Urbana-Champaign.
 * For more information on the Apache Group and the Apache HTTP server
 * project, please see <http://www.apache.org/>.
 *
 */

/* mod_userpath
 *
 * This is a hacked version of mod_userdir.c 
 *
 * This provides support for situations where all of the users web pages
 * are stored in a central location, that is
 * ~abc --> /<userpath>/abc/
 * ~xyz --> /<userpath>/xyz/
 *
 * This was fairly straightforward to implement in the CERN server, as
 * the pass command took wildcards, however Apache doesn't seem to have
 * this feature, and as implementing this seemed easier than implementing
 * wildcards I did so.
 *
 * This adds an extra directive UserPath <pathname> which will transform
 * URLs in the way described above.
 *
 * Install it in the usual way, but remember to remove the mod_userdir.c
 * module, otherwise strange things may start to happen.
 *
 * I hope this proves useful - comments, idle chit-chat etc to 
 * sxw@tardis.ed.ac.uk
 *
 * Simon Wilkinson
 */

#include "httpd.h"
#include "http_config.h"

module userpath_module;

/*
 * Sever config for this module is a little unconventional...
 * It's just one string anyway, so why pretend?
 */

#define DEFAULT_USER_PATH "/usr/local/etc/httpd/htdocs/"


void *create_userpath_config (pool *dummy, server_rec *s) { 
    return (void*)DEFAULT_USER_PATH; 
}

char *set_user_path (cmd_parms *cmd, void *dummy, char *arg)
{
    void *server_conf = cmd->server->module_config;
    
    set_module_config (server_conf, &userpath_module,
		       pstrdup (cmd->pool, arg));
    return NULL;
}

command_rec userpath_cmds[] = {
{ "UserPath", set_user_path, NULL, RSRC_CONF, TAKE1,
    "the directory which contains all user html directories or 'disabled'" },
{ NULL }
};

int translate_userpath (request_rec *r)
{
    void *server_conf = r->server->module_config;
    char *userpath = (char *)get_module_config(server_conf, &userpath_module);
    char *name = r->uri;
    
    if (userpath != NULL && strcasecmp(userpath, "disabled") != 0 &&
	name[0] == '/' && name[1] == '~')
    {
        struct passwd *pw;
	char *w, *dname;

        dname = name + 2;
	/* w = getword(r->pool, &dname, '/');
	   if(!(pw=getpwnam(w)))
	   return NOT_FOUND;
	   */
	
	/* The 'dname' funny business involves backing it up to capture
	 * the '/' delimiting the "/~user" part from the rest of the URL,
	 * in case there was one (the case where there wasn't being just
	 * "GET /~user HTTP/1.0", for which we don't want to tack on a
	 * '/' onto the filename).
	 */
	
	if (dname[-1] == '/') --dname;
	r->filename = pstrcat (r->pool, userpath, "/", dname, NULL);

	return OK;
    }

    return DECLINED;
}
    
module userpath_module = {
   STANDARD_MODULE_STUFF,
   NULL,			/* initializer */
   NULL,			/* dir config creater */
   NULL,			/* dir merger --- default is to override */
   create_userpath_config,	/* server config */
   NULL,			/* merge server config */
   userpath_cmds,		/* command table */
   NULL,			/* handlers */
   translate_userpath,		/* filename translation */
   NULL,			/* check_user_id */
   NULL,			/* check auth */
   NULL,			/* check access */
   NULL,			/* type_checker */
   NULL,			/* fixups */
   NULL				/* logger */
};