#!/usr/bin/perl -wT
#
# TWiki Collaboration Platform, http://TWiki.org/
#
# Copyright (C) 2001 Klaus Wriessnegger, kw@sap.com
# Copyright (C) 2001 Andrea Sterbini, a.sterbini@flashnet.it
# Copyright (C) 2001-2003 Peter Thoeny, peter@thoeny.com
#
# For licensing info read license.txt file in the TWiki root.
# 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 2
# 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, published at
# http://www.gnu.ai.mit.edu/copyleft/gpl.html
#
# 26-5-01 Password installation (only by the $superAdminGroup)
#

#usage example:
#
#I n s t a l l
#
#</form>
#<form name="passwd" action="/%SCRIPTURLPATH%/passwd%SCRIPTSUFFIX%/%WEB%/">
#Username:EncryptedPW <input type="text" name="encryptedpassword" value="" size="16" /> <br />
#<input type="submit" name="passwd" />
#<input type="hidden" name="install" value="on" />
#</form>
 

# Set library paths in @INC, at compile time
BEGIN { unshift @INC, '.'; require 'setlib.cfg'; }

use CGI::Carp qw(fatalsToBrowser);
use CGI;
use TWiki;
 
$query= new CGI;
 
&main();
 
sub main
{
    # get all parameters from the form
    my $wikiName = $query->param( 'username' );

    #initialize
    my $topicName = $query->param( 'TopicName' );
    my $thePathInfo = $query->path_info();
    my $theUrl = $query->url;

    ( $topic, $webName ) =
        &TWiki::initialize( $thePathInfo, $wikiName, $topicName, $theUrl, $query );
 
    my $text = "";
    my $url = "";

    my $theRemoteUser = $query->remote_user();
    my ( $dummy1, $dummy2, $dummy3, $userName ) = 
	&TWiki::initialize( $thePathInfo, $theRemoteUser, $topicName, $theUrl, $query );
    my $wikiUserName = &TWiki::userToWikiName( $userName );

    if( ! &TWiki::Access::userIsInGroup( $wikiUserName, $TWiki::superAdminGroup ) ) {
    	# user has no permission to install the password
    	my $url = &TWiki::getOopsUrl( $webName, $topic, "oopsaccessgroup", "$TWiki::mainWebname.$TWiki::superAdminGroup" );
    	TWiki::redirect( $query, $url );
    	return;
    }

    my $theCryptPassword = $query->param( 'encryptedPassword' ) || '';
    if ( ! $theCryptPassword ) {
	# missing username:encryptedpassword
    	$url = &TWiki::getOopsUrl( $webName, $topic, "oopsregrequ", );
        TWiki::redirect( $query, $url );
        return;
    }
	
    # TODO: I18N fix here once basic auth problem with 8-bit user names is
    # solved
    if ( $theCryptPassword =~ m/^([A-Z][a-zA-Z]+[A-Z][a-zA-Z]*)\:.{13}$/ ) {
	$wikiName = $1;
    } else {
	# bad format
    	$url = &TWiki::getOopsUrl( $webName, $topic, "oopsbadpwformat", $theCryptPassword);
        TWiki::redirect( $query, $url );
        return;
    }

    # check if user entry exists
    if(  ( $wikiName )  && (! htpasswdExistUser( $wikiName ) ) ){
        # PTh 20 Jun 2000: changed to getOopsUrl
        $url = &TWiki::getOopsUrl( $webName, $topic, "oopsnotwikiuser", $wikiName );
        TWiki::redirect( $query, $url );
        return;
    }

    # old password
    my $oldcrypt = htpasswdReadPasswd( $wikiName );
    # OK - password may be changed
    my $oldCryptPassword = "$wikiName\:$oldcrypt";
    htpasswdAddUser( $oldCryptPassword, $theCryptPassword );

    # OK - password changed
    $url = &TWiki::getOopsUrl( $webName, $topic, "oopschangepasswd" );
    TWiki::redirect( $query, $url );
    return; 
}

#========================= 
sub htpasswdReadPasswd
{
    my ( $user ) = @_;
 
    if( ! $user ) {
        return "";
    }
 
    my $text = &TWiki::Store::readFile( $TWiki::htpasswdFilename );
    if( $text =~ /$user\:(\S+)/ ) {
        return $1;
    }
    return "";
}
 
sub htpasswdExistUser
{
    my ( $user ) = @_;
 
    if( ! $user ) {
        return "";
    }
 
    my $text = &TWiki::Store::readFile( $TWiki::htpasswdFilename );
    if( $text =~ /$user\:/go ) {
        return "1";
    }
    return "";
}
 
sub htpasswdAddUser
{
    my ( $oldUserEntry, $newUserEntry ) = @_;
 
    # can't use `htpasswd $wikiName` because htpasswd doesn't understand stdin
    # simply add name to file, but this is a security issue
    my $text = &TWiki::Store::readFile( $TWiki::htpasswdFilename );
    $text =~ s/$oldUserEntry/$newUserEntry/;
    &TWiki::Store::saveFile( $TWiki::htpasswdFilename, $text );
}