<?php
// +-----------------------------------------------------------------------+
// | PhpWebGallery - a PHP based picture gallery                           |
// | Copyright (C) 2002-2003 Pierrick LE GALL - pierrick@phpwebgallery.net |
// | Copyright (C) 2003-2004 PhpWebGallery Team - http://phpwebgallery.net |
// +-----------------------------------------------------------------------+
// | branch        : BSF (Best So Far)
// | file          : $RCSfile$
// | last update   : $Date$
// | last modifier : $Author$
// | revision      : $Revision$
// +-----------------------------------------------------------------------+
// | 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                                          |
// |                                                                       |
// | 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, write to the Free Software           |
// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
// | USA.                                                                  |
// +-----------------------------------------------------------------------+

// validate_mail_address verifies whether the given mail address has the
// right format. ie someone@domain.com "someone" can contain ".", "-" or
// even "_". Exactly as "domain". The extension doesn't have to be
// "com". The mail address can also be empty.
// If the mail address doesn't correspond, an error message is returned.
function validate_mail_address( $mail_address )
{
  global $lang;

  if ( $mail_address == '' )
  {
    return '';
  }
  $regex = '/^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)*\.[a-z]+$/';
  if ( !preg_match( $regex, $mail_address ) )
  {
    return $lang['reg_err_mail_address'];
  }
}

function register_user( $login, $password, $password_conf,
                        $mail_address, $status = 'guest' )
{
  global $lang;

  $error = array();
  $i = 0;
  // login must not
  //      1. be empty
  //      2. start ou end with space character
  //      3. include ' or " characters
  //      4. be already used
  if ( $login == '' )            $error[$i++] = $lang['reg_err_login1'];
  if ( ereg( "^.* $", $login) )  $error[$i++] = $lang['reg_err_login2'];
  if ( ereg( "^ .*$", $login ) ) $error[$i++] = $lang['reg_err_login3'];

  if ( ereg( "'", $login ) or ereg( "\"", $login ) )
    $error[$i++] = $lang['reg_err_login4'];
  else
  {
    $query = 'SELECT id';
    $query.= ' FROM '.USERS_TABLE;
    $query.= " WHERE username = '".$login."'";
    $query.= ';';
    $result = pwg_query( $query );
    if ( mysql_num_rows($result) > 0 ) $error[$i++] = $lang['reg_err_login5'];
  }
  // given password must be the same as the confirmation
  if ( $password != $password_conf ) $error[$i++] = $lang['reg_err_pass'];

  $error_mail_address = validate_mail_address( $mail_address );
  if ( $error_mail_address != '' ) $error[$i++] = $error_mail_address;

  // if no error until here, registration of the user
  if ( sizeof( $error ) == 0 )
  {
    // 1. retrieving default values, the ones of the user "guest"
    $infos = array( 'nb_image_line', 'nb_line_page', 'language',
                    'maxwidth', 'maxheight', 'expand', 'show_nb_comments',
                    'recent_period', 'template', 'forbidden_categories' );
    $query = 'SELECT ';
    for ( $i = 0; $i < sizeof( $infos ); $i++ )
    {
      if ( $i > 0 ) $query.= ',';
      $query.= $infos[$i];
    }
    $query.= ' FROM '.USERS_TABLE;
    $query.= " WHERE username = 'guest'";
    $query.= ';';
    $row = mysql_fetch_array( pwg_query( $query ) );
    // 2. adding new user
    $query = 'INSERT INTO '.USERS_TABLE;
    $query.= ' (';
    $query.= ' username,password,mail_address,status';
    for ( $i = 0; $i < sizeof( $infos ); $i++ )
    {
      $query.= ','.$infos[$i];
    }
    $query.= ') values (';
    $query.= " '".$login."'";
    $query.= ",'".md5( $password )."'";
    if ( $mail_address != '' ) $query.= ",'".$mail_address."'";
    else                       $query.= ',NULL';
    $query.= ",'".$status."'";
    foreach ( $infos as $info ) {
      $query.= ',';
      if ( !isset( $row[$info] ) ) $query.= 'NULL';
      else                         $query.= "'".$row[$info]."'";
    }
    $query.= ');';
    pwg_query( $query );
  }
  return $error;
}

function update_user( $user_id, $mail_address, $status,
                      $use_new_password = false, $password = '' )
{
  $error = array();
  $i = 0;
  
  $error_mail_address = validate_mail_address( $mail_address );
  if ( $error_mail_address != '' )
  {
    $error[$i++] = $error_mail_address;
  }

  if ( sizeof( $error ) == 0 )
  {
    $query = 'UPDATE '.USERS_TABLE;
    $query.= " SET status = '".$status."'";
    if ( $use_new_password )
    {
      $query.= ", password = '".md5( $password )."'";
    }
    $query.= ', mail_address = ';
    if ( $mail_address != '' )
    {
      $query.= "'".$mail_address."'";
    }
    else
    {
      $query.= 'NULL';
    }
    $query.= ' WHERE id = '.$user_id;
    $query.= ';';
    pwg_query( $query );
  }
  return $error;
}

function check_login_authorization($guest_allowed = true)
{
  global $user,$lang;

  if ($user['is_the_guest'] and !$guest_allowed)
  {
    echo '<div style="text-align:center;">'.$lang['only_members'].'<br />';
    echo '<a href="./identification.php">'.$lang['ident_title'].'</a></div>';
    exit();
  }
}

function setup_style($style)
{
  $template_path = 'template/' ;
  $template_name = $style ;
  $template = new Template(PHPWG_ROOT_PATH . $template_path . $template_name);
  return $template;
}

function getuserdata($user)
{
  $sql = "SELECT * FROM " . USERS_TABLE;
  $sql.= " WHERE ";
  $sql .= ( ( is_integer($user) ) ? "id = $user" : "username = '" .  str_replace("\'", "''", $user) . "'" ) . " AND id <> " . ANONYMOUS;
  $result = pwg_query($sql);
  return ( $row = mysql_fetch_array($result) ) ? $row : false;
}

/*
 * deletes favorites of the current user if he's not allowed to see them
 *
 * @return void
 */
function check_user_favorites()
{
  global $user;

  if ($user['forbidden_categories'] == '')
  {
    return;
  }
  
  $query = '
SELECT f.image_id
  FROM '.FAVORITES_TABLE.' AS f INNER JOIN '.IMAGE_CATEGORY_TABLE.' AS ic
    ON f.image_id = ic.image_id
  WHERE f.user_id = '.$user['id'].'
    AND ic.category_id IN ('.$user['forbidden_categories'].')
;';
  $result = pwg_query($query);
  $elements = array();
  while ($row = mysql_fetch_array($result))
  {
    array_push($elements, $row['image_id']);
  }

  if (count($elements) > 0)
  {
    $query = '
DELETE FROM '.FAVORITES_TABLE.'
  WHERE image_id IN ('.implode(',', $elements).')
    AND user_id = '.$user['id'].'
;';
    pwg_query($query);
  }
}

/**
 * update table user_forbidden for the given user
 *
 * table user_forbidden contains calculated data. Calculation is based on
 * private categories minus categories authorized to the groups the user
 * belongs to minus the categories directly authorized to the user
 *
 * @param int user_id
 * @return string forbidden_categories
 */
function calculate_permissions($user_id)
{
  $private_array = array();
  $authorized_array = array();

  $query = '
SELECT id
  FROM '.CATEGORIES_TABLE.'
  WHERE status = \'private\'
;';
  $result = pwg_query($query);
  while ($row = mysql_fetch_array($result))
  {
    array_push($private_array, $row['id']);
  }
  
  // retrieve category ids directly authorized to the user
  $query = '
SELECT cat_id
  FROM '.USER_ACCESS_TABLE.'
  WHERE user_id = '.$user_id.'
;';
  $result = pwg_query($query);
  while ($row = mysql_fetch_array($result))
  {
    array_push($authorized_array, $row['cat_id']);
  }

  // retrieve category ids authorized to the groups the user belongs to
  $query = '
SELECT cat_id
  FROM '.USER_GROUP_TABLE.' AS ug INNER JOIN '.GROUP_ACCESS_TABLE.' AS ga
    ON ug.group_id = ga.group_id
  WHERE ug.user_id = '.$user_id.'
;';
  $result = pwg_query($query);
  while ($row = mysql_fetch_array($result))
  {
    array_push($authorized_array, $row['cat_id']);
  }

  // uniquify ids : some private categories might be authorized for the
  // groups and for the user
  $authorized_array = array_unique($authorized_array);

  // only unauthorized private categories are forbidden
  $forbidden_array = array_diff($private_array, $authorized_array);

  $query = '
DELETE FROM '.USER_FORBIDDEN_TABLE.'
  WHERE user_id = '.$user_id.'
;';
  pwg_query($query);

  $forbidden_categories = implode(',', $forbidden_array);
  
  $query = '
INSERT INTO '.USER_FORBIDDEN_TABLE.'
  (user_id,need_update,forbidden_categories)
  VALUES
  ('.$user_id.',\'false\',\''.$forbidden_categories.'\')
;';
  pwg_query($query);
  
  return $forbidden_categories;
}
?>