path: root/include/ws_functions.inc.php

<?php
// +-----------------------------------------------------------------------+
// | PhpWebGallery - a PHP based picture gallery                           |
// | Copyright (C) 2003-2007 PhpWebGallery Team - http://phpwebgallery.net |
// +-----------------------------------------------------------------------+
// | branch        : BSF (Best So Far)
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// | last update   : $Date$
// | last modifier : $Author$
// | revision      : $Rev$
// +-----------------------------------------------------------------------+
// | 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                                          |
// |                                                                       |
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// | 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.                                                                  |
// +-----------------------------------------------------------------------+

/**** IMPLEMENTATION OF WEB SERVICE METHODS ***********************************/

/**
 * ws_add_controls 
 * returns additionnal controls if requested
 * usable for 99% of Web Service methods 
 * 
 * - Args  
 * $method: is the requested method
 * $partner: is the key
 * $tbl_name: is the alias_name in the query (sometimes called correlation name)
 *            null if !getting picture informations 
 * - Logic
 * Access_control is not active: Return 
 * Key is incorrect: Return 0 = 1 (False condition for MySQL)  
 * One of Params doesn't match with type of request: return 0 = 1 again 
 * Access list(id/cat/tag) is converted in expended image-id list
 * image-id list: converted to an in-where-clause
 *   
 * The additionnal in-where-clause is return
 */       
function ws_add_controls( $method, $tbl_name )
{
  global $conf, $partner;
  if ( !$conf['ws_access_control'] )
  {
    return ' 1 = 1 '; // No controls are requested 
  }
  
// Is it an active Partner? 
  $query = '
SELECT * FROM '.WEB_SERVICES_ACCESS_TABLE."
 WHERE `name` = '$partner'
   AND NOW() <= end; ";
$result = pwg_query($query);
  if ( mysql_num_rows( $result ) == 0 )
  {     
    return ' 0 = 1 '; // Unknown partner or Obsolate agreement
  }
  
  $row = mysql_fetch_array($result);

// Method / Request matching
// Generic is not ready 
// For generic you can say... tags. or categories. or images. maybe?
  $filter = $row['request'];
  $request_method = substr($method, 0, strlen($filter)) ;
  if ( $filter !== $filter_method )
  {
    return ' 0 = 1'; // Unauthorized method request
  }

// Target restrict
// 3 cases: list, cat or tag
// Behind / we could found img-ids, cat-ids or tag-ids
  $target = $row['access'];
  list($type, $str_ids) = explode('/',$target); // Find type list

  $ids = explode( ',',$str_ids );
// (array) 1,2,21,3,22,4,5,9-12,6,11,12,13,2,4,6,
  $arr_ids = expand_id_list( $ids );
  $addings = implode(',', $arr_ids); 
// (string) 1,2,3,4,5,6,9,10,11,12,13,21,22, 
  if ( $type = 'list')
  {
    return $tbl_name . 'id IN ( ' . $addings . ' ) ';
  }
  
  if ( $type = 'cat' )
  {
    $addings = implode(',', get_image_ids_for_cats($arr_ids));
    return $tbl_name . 'id IN ( ' . $addings . ' ) ';
  }
  
  if ( $type = 'tag' )
  { 
    $addings = implode(',', get_image_ids_for_tags($arr_ids, 'OR'));
    return $tbl_name . 'id IN ( ' . $addings . ' ) ';
  }
  // Unmanaged new type?
  return ' 0 = 1 '; // ??? 
}

/**
 * returns a "standard" (for our web service) array of sql where clauses that
 * filters the images (images table only)
 */
function ws_std_image_sql_filter( $params, $tbl_name='' )
{
  $clauses = array();
  if ( is_numeric($params['f_min_rate']) )
  {
    $clauses[] = $tbl_name.'average_rate>'.$params['f_min_rate'];
  }
  if ( is_numeric($params['f_max_rate']) )
  {
    $clauses[] = $tbl_name.'average_rate<='.$params['f_max_rate'];
  }
  if ( is_numeric($params['f_min_hit']) )
  {
    $clauses[] = $tbl_name.'hit>'.$params['f_min_hit'];
  }
  if ( is_numeric($params['f_max_hit']) )
  {
    $clauses[] = $tbl_name.'hit<='.$params['f_max_hit'];
  }
  if ( isset($params['f_min_date_posted']) )
  {
    $clauses[] = $tbl_name."date_available>='".$params['f_min_date_posted']."'";
  }
  if ( isset($params['f_max_date_posted']) )
  {
    $clauses[] = $tbl_name."date_available<'".$params['f_max_date_posted']."'";
  }
  if ( isset($params['f_min_date_created']) )
  {
    $clauses[] = $tbl_name."date_creation>='".$params['f_min_date_created']."'";
  }
  if ( isset($params['f_max_date_created']) )
  {
    $clauses[] = $tbl_name."date_creation<'".$params['f_max_date_created']."'";
  }
  if ( is_numeric($params['f_min_ratio']) )
  {
    $clauses[] = $tbl_name.'width/'.$tbl_name.'height>'.$params['f_min_ratio'];
  }
  if ( is_numeric($params['f_max_ratio']) )
  {
    $clauses[] = $tbl_name.'width/'.$tbl_name.'height<='.$params['f_max_ratio'];
  }
  if ( $params['f_with_thumbnail'] )
  {
    $clauses[] = $tbl_name.'tn_ext IS NOT NULL';
  }
  // Squared picture to show to rvelices how to solve that kind of request
  if ( $params['f_square_ratio'] )
  {
    $clauses[] = $tbl_name.'width/'.$tbl_name.'height BETWEEN '
               . $params['f_square_ratio'] . ' AND '
               . (2 - $params['f_square_ratio']) ;
  }
  return $clauses;
}

/**
 * returns a "standard" (for our web service) ORDER BY sql clause for images
 */
function ws_std_image_sql_order( $params, $tbl_name='' )
{
  $ret = '';
  if ( empty($params['order']) )
  {
    return $ret;
  }
  $matches = array();
  preg_match_all('/([a-z_]+) *(?:(asc|desc)(?:ending)?)? *(?:, *|$)/i',
    $params['order'], $matches);
  for ($i=0; $i<count($matches[1]); $i++)
  {
    switch ($matches[1][$i])
    {
      case 'date_created':
        $matches[1][$i] = 'date_creation'; break;
      case 'date_posted':
        $matches[1][$i] = 'date_available'; break;
      case 'rand': case 'random':
        $matches[1][$i] = 'RAND()'; break;
    }
    $sortable_fields = array('id', 'file', 'name', 'hit', 'average_rate',
      'date_creation', 'date_available', 'RAND()' );
    if ( in_array($matches[1][$i], $sortable_fields) )
    {
      if (!empty($ret))
        $ret .= ', ';
      if ($matches[1][$i] != 'RAND()' )
      {
        $ret .= $tbl_name;
      }
      $ret .= $matches[1][$i];
      $ret .= ' '.$matches[2][$i];
    }
  }
  return $ret;
}

/**
 * returns an array map of urls (thumb/element) for image_row - to be returned
 * in a standard way by different web service methods
 */
function ws_std_get_urls($image_row)
{
  $ret = array(
    'tn_url' => get_thumbnail_url($image_row),
    'element_url' => get_element_url($image_row)
  );
  global $user;
  if ($user['enabled_high'] and $image_row['has_high'] )
  {
    $ret['high_url'] = get_high_url($image_row);
  }
  return $ret;
}


function ws_getVersion($params, &$service)
{
//  Needed for security reason... Maybe???
//  $where_clause[] = 
//          ws_add_controls( 'getVersion', null );
  return PHPWG_VERSION;
}

/**
 * returns images per category (wb service method)
 */
function ws_categories_getImages($params, &$service)
{
  @include_once(PHPWG_ROOT_PATH.'include/functions_picture.inc.php');
  global $user, $conf;

  $images = array();

  //------------------------------------------------- get the related categories
  $where_clauses = array();
  foreach($params['cat_id'] as $cat_id)
  {
    $cat_id = (int)$cat_id;
    if ($cat_id<=0)
      continue;
    if ($params['recursive'])
    {
      $where_clauses[] = 'uppercats REGEXP \'(^|,)'.$cat_id.'(,|$)\'';
    }
    else
    {
      $where_clauses[] = 'id='.$cat_id;
    }
  }
  if (!empty($where_clauses))
  {
    $where_clauses = array( '('.
    implode('
    OR ', $where_clauses) . ')'
      );
  }
  $where_clauses[] = 'id NOT IN ('.$user['forbidden_categories'].')';

  $query = '
SELECT id, name, image_order
  FROM '.CATEGORIES_TABLE.'
  WHERE '. implode('
    AND ', $where_clauses);
  $result = pwg_query($query);
  $cats = array();
  while ($row = mysql_fetch_assoc($result))
  {
    $row['id'] = (int)$row['id'];
    $cats[ $row['id'] ] = $row;
  }

  //-------------------------------------------------------- get the images
  if ( !empty($cats) )
  {
    $where_clauses = ws_std_image_sql_filter( $params, 'i.' );
    $where_clauses[] = 'category_id IN ('
      .implode(',', array_keys($cats) )
      .')';

//  Mandatory 
//  $where_clause[] = 
//          ws_add_controls( 'categories.getImages', 'i.' );
    
    $order_by = ws_std_image_sql_order($params, 'i.');
    if (empty($order_by))
    {// TODO check for category order by (image_order)
      $order_by = $conf['order_by'];
    }
    else
    {
      $order_by = 'ORDER BY '.$order_by;
    }
    $query = '
SELECT i.*, GROUP_CONCAT(category_id) cat_ids
  FROM '.IMAGES_TABLE.' i
    INNER JOIN '.IMAGE_CATEGORY_TABLE.' ON i.id=image_id
  WHERE '. implode('
    AND ', $where_clauses).'
GROUP BY i.id
'.$order_by.'
LIMIT '.$params['per_page']*$params['page'].','.$params['per_page'];

    $result = pwg_query($query);
    while ($row = mysql_fetch_assoc($result))
    {
      $image = array();
      foreach ( array('id', 'width', 'height', 'hit') as $k )
      {
        if (isset($row[$k]))
        {
          $image[$k] = (int)$row[$k];
        }
      }
      foreach ( array('name', 'file') as $k )
      {
        $image[$k] = $row[$k];
      }
      $image = array_merge( $image, ws_std_get_urls($row) );

      $image_cats = array();
      foreach ( explode(',', $row['cat_ids']) as $cat_id )
      {
        $url = make_index_url(
                array(
                  'category' => $cat_id,
                  'cat_name' => $cats[$cat_id]['name'],
                  )
                );
        $page_url = make_picture_url(
                array(
                  'category' => $cat_id,
                  'cat_name' => $cats[$cat_id]['name'],
                  'image_id' => $row['id'],
                  'image_file' => $row['file'],
                  )
                );
        array_push( $image_cats,  array(
              WS_XML_ATTRIBUTES => array (
                  'id' => (int)$cat_id,
                  'url' => $url,
                  'page_url' => $page_url,
                )
            )
          );
      }

      $image['categories'] = new PwgNamedArray(
            $image_cats,'category', array('id','url','page_url')
          );
      array_push($images, $image);
    }
  }

  return array( 'images' =>
    array (
      WS_XML_ATTRIBUTES =>
        array(
            'page' => $params['page'],
            'per_page' => $params['per_page'],
            'count' => count($images)
          ),
       WS_XML_CONTENT => new PwgNamedArray($images, 'image',
          array('id', 'tn_url', 'element_url', 'file','width','height','hit') )
      )
    );
}

/**
 * returns a list of categories
 */
function ws_categories_getList($params, &$service)
{
  global $user;

  $where = array();
  $where[]= 'user_id='.$user['id'];
  if ($params['cat_id']>0)
  {
    $where[] = 'uppercats REGEXP \'(^|,)'.
      (int)($params['cat_id'])
      .'(,|$)\'';
  }

  if (!$params['recursive'])
  {
    if ($params['cat_id']>0)
      $where[] = 'id_uppercat='.(int)($params['cat_id']);
    else
      $where[] = 'id_uppercat IS NULL';
  }

  if ($params['public'])
  {
    $where[] = 'status = "public"';
    $where[] = 'visible = "true"';
  }
  else
  {
    $where[] = 'id NOT IN ('.$user['forbidden_categories'].')';
  }

// To ONLY build external links maybe ???  
//  $where_clause[] = 
//          ws_add_controls( 'categories.getList', null );
// Making links in a Blog...

  $query = '
SELECT id, name, uppercats, global_rank,
    max_date_last, count_images AS nb_images, count_categories AS nb_categories
  FROM '.CATEGORIES_TABLE.'
   INNER JOIN '.USER_CACHE_CATEGORIES_TABLE.' ON id=cat_id
  WHERE '. implode('
    AND ', $where);
  $query .= '
ORDER BY global_rank';

  $result = pwg_query($query);

  $cats = array();
  while ($row = mysql_fetch_assoc($result))
  {
    $row['url'] = make_index_url(
        array(
          'category' => $row['id'],
          'cat_name' => $row['name'],
          )
      );
    foreach( array('id','nb_images','nb_categories') as $key)
    {
      $row[$key] = (int)$row[$key];
    }
    array_push($cats, $row);
  }
  usort($cats, 'global_rank_compare');
  return array(
      'categories' =>
          new PwgNamedArray($cats,'category',
            array('id','url','nb_images','nb_categories','max_date_last')
          )
    );
}

function ws_images_getInfo($params, &$service)
{
  @include_once(PHPWG_ROOT_PATH.'include/functions_picture.inc.php');
  global $user;
  $params['image_id'] = (int)$params['image_id'];
  if ( $params['image_id']<=0 )
  {
    return new PwgError(WS_ERR_INVALID_PARAM, "Invalid image_id");
  }
// Mandatory (No comment)  
//  $where_clause[] = 
//          ws_add_controls( 'images.getInfo', '' );  
  $query='
SELECT * FROM '.IMAGES_TABLE.'
  WHERE id='.$params['image_id'].
    get_sql_condition_FandF(
      array('visible_images' => 'id'),
      ' AND'
    ).'
LIMIT 1';

  $image_row = mysql_fetch_assoc(pwg_query($query));
  if ($image_row==null)
  {
    return new PwgError(999, "image_id not found");
  }
  array_merge( $image_row, ws_std_get_urls($image_row) );

  //-------------------------------------------------------- related categories
  $query = '
SELECT c.id,c.name,c.uppercats,c.global_rank
  FROM '.IMAGE_CATEGORY_TABLE.'
    INNER JOIN '.CATEGORIES_TABLE.' c ON category_id = id
  WHERE image_id = '.$image_row['id'].'
    AND category_id NOT IN ('.$user['forbidden_categories'].')
;';
  $result = pwg_query($query);
  $related_categories = array();
  while ($row = mysql_fetch_assoc($result))
  {
    $row['url'] = make_index_url(
        array(
          'category' => $row['id'],
          'cat_name' => $row['name'],
          )
      );

    $row['page_url'] = make_picture_url(
        array(
          'image_id' => $image_row['id'],
          'image_file' => $image_row['file'],
          'category' => $row['id'],
          'cat_name' => $row['name'],
          )
      );
    array_push($related_categories, $row);
  }
  usort($related_categories, 'global_rank_compare');
  if ( empty($related_categories) )
  {
    return new PwgError(401, 'Access denied');
  }

  //-------------------------------------------------------------- related tags
  $query = '
SELECT id, name, url_name
  FROM '.IMAGE_TAG_TABLE.'
    INNER JOIN '.TAGS_TABLE.' ON tag_id = id
  WHERE image_id = '.$image_row['id'].'
;';
  $result = pwg_query($query);
  $related_tags = array();
  while ($row = mysql_fetch_assoc($result))
  {
    $row['url'] = make_index_url(
        array(
          'tags' => array($row)
          )
      );
    $row['page_url'] = make_picture_url(
        array(
          'image_id' => $image_row['id'],
          'image_file' => $image_row['file'],
          'tags' => array($row),
          )
      );
    array_push($related_tags, $row);
  }
  //---------------------------------------------------------- related comments
  $query = '
SELECT COUNT(id) nb_comments
  FROM '.COMMENTS_TABLE.'
  WHERE image_id = '.$image_row['id'];
  list($nb_comments) = array_from_query($query, 'nb_comments');

  $query = '
SELECT id, date, author, content
  FROM '.COMMENTS_TABLE.'
  WHERE image_id = '.$image_row['id'].'
    AND validated="true"';
  $query .= '
  ORDER BY date DESC
  LIMIT 0, 5';

  $result = pwg_query($query);
  $related_comments = array();
  while ($row = mysql_fetch_assoc($result))
  {
    array_push($related_comments, $row);
  }

  //------------------------------------------------------------- related rates
  $query = '
SELECT COUNT(rate) AS count
     , ROUND(AVG(rate),2) AS average
     , ROUND(STD(rate),2) AS stdev
  FROM '.RATE_TABLE.'
  WHERE element_id = '.$image_row['id'].'
;';
  $row = mysql_fetch_assoc(pwg_query($query));

  $ret = $image_row;
  $ret['rates'] = array( WS_XML_ATTRIBUTES => $row );
  $ret['categories'] = new PwgNamedArray($related_categories, 'category', array('id','url', 'page_url') );
  $ret['tags'] = new PwgNamedArray($related_tags, 'tag', array('id','url_name','url','page_url') );
  $ret['comments'] = array(
     WS_XML_ATTRIBUTES => array('nb_comments' => $nb_comments),
     WS_XML_CONTENT => new PwgNamedArray($related_comments, 'comment', array('id') )
      );
  unset($ret['path']);
  unset($ret['storage_category_id']);
  return new PwgNamedStruct('image',$ret, null, array('name','comment') );
}


function ws_session_login($params, &$service)
{
  global $conf;

  if (!$service->isPost())
  {
    return new PwgError(400, "This method requires POST");
  }
  if (try_log_user($params['username'], $params['password'],false))
  {
    return true;
  }
  return new PwgError(999, 'Invalid username/password');
}

function ws_session_logout($params, &$service)
{
  global $user, $conf;
  if (!$user['is_the_guest'])
  {
    $_SESSION = array();
    session_unset();
    session_destroy();
    setcookie(session_name(),'',0,
        ini_get('session.cookie_path'),
        ini_get('session.cookie_domain')
      );
    setcookie($conf['remember_me_name'], '', 0, cookie_path());
  }
  return true;
}

function ws_session_getStatus($params, &$service)
{
  global $user;
  $res = array();
  $res['username'] = $user['is_the_guest'] ? 'guest' : $user['username'];
  $res['status'] = $user['status'];
  return $res;
}


function ws_tags_getList($params, &$service)
{
  global $user;
  $tags = get_available_tags();
  if ($params['sort_by_counter'])
  {
    usort($tags, create_function('$a,$b', 'return -$a["counter"]+$b["counter"];') );
  }
  else
  {
    usort($tags, 'name_compare');
  }
  for ($i=0; $i<count($tags); $i++)
  {
    $tags[$i]['id'] = (int)$tags[$i]['tag_id'];
    $tags[$i]['counter'] = (int)$tags[$i]['counter'];
    unset($tags[$i]['tag_id']);
    $tags[$i]['url'] = make_index_url(
        array(
          'section'=>'tags',
          'tags'=>array($tags[$i])
        )
      );
  }
  return array('tags' => new PwgNamedArray($tags, 'tag', array('id','url_name','url', 'counter' )) );
}

function ws_tags_getImages($params, &$service)
{
  @include_once(PHPWG_ROOT_PATH.'include/functions_picture.inc.php');
  global $user, $conf;

  // first build all the tag_ids we are interested in
  $tag_ids = array();
  $tags = get_available_tags();
  $tags_by_id = array();
  for( $i=0; $i<count($tags); $i++ )
  {
    $tags[$i]['tag_id']=(int)$tags[$i]['tag_id'];
    $tags[$i]['id']=(int)$tags[$i]['tag_id']; //required by make_xxx_url
  }
  foreach( $tags as $tag )
  {
    $tags_by_id[ $tag['tag_id'] ] = $tag;
    if (
        in_array($tag['name'], $params['tag_name'])
      or
        in_array($tag['url_name'], $params['tag_url_name'])
       )
    {
      $tag_ids[] = $tag['tag_id'];
    }
  }
  unset($tags);

  foreach( $params['tag_id'] as $tag_id )
  {
    if ( (int)$tag_id > 0 )
    {
      $tag_ids[] = $tag_id;
    }
  }

  $tag_ids = array_unique( $tag_ids );

  $image_ids = array();
  $image_tag_map = array();
  
  if ( !empty($tag_ids) )
  { // build list of image ids with associated tags per image
    if ($params['tag_mode_and'])
    {
      $image_ids = get_image_ids_for_tags( $tag_ids );
    }
    else
    {
      $query = '
SELECT image_id, GROUP_CONCAT(tag_id) tag_ids
  FROM '.IMAGE_TAG_TABLE.'
  WHERE tag_id IN ('.implode(',',$tag_ids).')
  GROUP BY image_id';
      $result = pwg_query($query);
      while ( $row=mysql_fetch_assoc($result) )
      {
        $row['image_id'] = (int)$row['image_id'];
        array_push( $image_ids, $row['image_id'] );
        $image_tag_map[ $row['image_id'] ] = explode(',', $row['tag_ids']);
      }
    }
  }

  $images = array();
  if ( !empty($image_ids))
  {
    $where_clauses = ws_std_image_sql_filter($params);
    $where_clauses[] = get_sql_condition_FandF(
        array
          (
            'forbidden_categories' => 'category_id',
            'visible_categories' => 'category_id',
            'visible_images' => 'i.id'
          ),
        '', true
      );
    $where_clauses[] = 'id IN ('.implode(',',$image_ids).')';
// Mandatory  
//  $where_clause[] = 
//          ws_add_controls( 'tags.getImages', '' );  

    $order_by = ws_std_image_sql_order($params);
    if (empty($order_by))
    {
      $order_by = $conf['order_by'];
    }
    else
    {
      $order_by = 'ORDER BY '.$order_by;
    }

    $query = '
SELECT DISTINCT i.* FROM '.IMAGES_TABLE.' i
  INNER JOIN '.IMAGE_CATEGORY_TABLE.' ON i.id=image_id
  WHERE '. implode('
    AND ', $where_clauses).'
'.$order_by.'
LIMIT '.$params['per_page']*$params['page'].','.$params['per_page'];

    $result = pwg_query($query);
    while ($row = mysql_fetch_assoc($result))
    {
      foreach ( array('id', 'width', 'height', 'hit') as $k )
      {
        if (isset($row[$k]))
        {
          $image[$k] = (int)$row[$k];
        }
      }
      foreach ( array('name', 'file') as $k )
      {
        $image[$k] = $row[$k];
      }
      $image = array_merge( $image, ws_std_get_urls($row) );

      $image_tag_ids = ($params['tag_mode_and']) ? $tag_ids : $image_tag_map[$image['id']];
      $image_tags = array();
      foreach ($image_tag_ids as $tag_id)
      {
        $url = make_index_url(
                 array(
                  'section'=>'tags',
                  'tags'=> array($tags_by_id[$tag_id])
                )
              );
        $page_url = make_picture_url(
                 array(
                  'section'=>'tags',
                  'tags'=> array($tags_by_id[$tag_id]),
                  'image_id' => $row['id'],
                  'image_file' => $row['file'],
                )
              );
        array_push($image_tags, array(
                'id' => (int)$tag_id,
                'url' => $url,
                'page_url' => $page_url,
              )
            );
      }
      $image['tags'] = new PwgNamedArray($image_tags, 'tag',
              array('id','url_name','url','page_url')
            );
      array_push($images, $image);
    }
  }

  return array( 'images' =>
    array (
      WS_XML_ATTRIBUTES =>
        array(
            'page' => $params['page'],
            'per_page' => $params['per_page'],
            'count' => count($images)
          ),
       WS_XML_CONTENT => new PwgNamedArray($images, 'image',
          array('id', 'tn_url', 'element_url', 'file','width','height','hit') )
      )
    );
}

/**
 * official_req returns the managed requests list in array format
 * FIXME A New list need to be build for ws_checker.php
 * returns array of authrorized request/methods
 * */   
function official_req()
{
return array(
    'random'                              /* Random order */
  , 'list'               /* list on MBt & z0rglub request */
  , 'maxviewed'             /* hit > 0 and hit desc order */
  , 'recent'        /* recent = Date_available desc order */
  , 'highrated'            /* avg_rate > 0 and desc order */
  , 'oldest'                  /* Date_available asc order */
  , 'lessviewed'                         /* hit asc order */
  , 'lowrated'                      /* avg_rate asc order */
  , 'undescribed'                  /* description missing */
  , 'unnamed'                         /* new name missing */
  , 'portraits'     /* width < height (portrait oriented) */
  , 'landscapes'   /* width > height (landscape oriented) */
  , 'squares'             /* width ~ height (square form) */
);
}

/**
 * expand_id_list($ids) convert a human list expression to a full ordered list
 * example : expand_id_list( array(5,2-3,2) ) returns array( 2, 3, 5)
 * */ 
function expand_id_list($ids)
{
    $tid = array();
    foreach ( $ids as $id )
    {
      if ( is_numeric($id) )
      {
        $tid[] = (int) $id;
      }
      else
      {
        $range = explode( '-', $id );
        if ( is_numeric($range[0]) and is_numeric($range[1]) )
        {
          $from = min($range[0],$range[1]);
          $to = max($range[0],$range[1]);
          for ($i = $from; $i <= $to; $i++) 
          {
            $tid[] = (int) $i;
          }
        }
      }
    }
    $result = array_unique ($tid); // remove duplicates...
    sort ($result);
    return $result;
}

/**
 * check_target($string) verifies and corrects syntax of target parameter
 * example : check_target(cat/23,24,24,24,25,27) returns cat/23-25,27
 * */ 
function check_target($list)
{
  if ( $list !== '' )
  {
    $type = explode('/',$list); // Find type list
    if ( !in_array($type[0],array('list','cat','tag') ) )
    {
      $type[0] = 'list'; // Assume an id list
    } 
    $ids = explode( ',',$type[1] );
    $list = $type[0] . '/';

    // 1,2,21,3,22,4,5,9-12,6,11,12,13,2,4,6,

    $result = expand_id_list( $ids ); 

    // 1,2,3,4,5,6,9,10,11,12,13,21,22, 
    // I would like
    // 1-6,9-13,21-22
    $serial[] = $result[0]; // To be shifted                      
    foreach ($result as $k => $id)
    {
      $next_less_1 = (isset($result[$k + 1]))? $result[$k + 1] - 1:-1;
      if ( $id == $next_less_1 and end($serial)=='-' )
      { // nothing to do 
      }
      elseif ( $id == $next_less_1 )
      {
        $serial[]=$id;
        $serial[]='-';
      }
      else
      {
        $serial[]=$id;  // end serie or non serie
      }
    }
    $null = array_shift($serial); // remove first value
    $list .= array_shift($serial); // add the real first one
    $separ = ',';
    foreach ($serial as $id)
    {
      $list .= ($id=='-') ? '' : $separ . $id;
      $separ = ($id=='-') ? '-':','; // add comma except if hyphen
    }
  }
  return $list;
}

/**
 * converts a cat-ids array in image-ids array
 * FIXME Function which should already exist somewhere else
 * */  
function get_image_ids_for_cats($cat_ids)
{
  $cat_list = implode(',', $cat_ids);
  $ret_ids = array();
  $query = '
  SELECT DISTINCT image_id 
    FROM '.IMAGE_CATEGORY_TABLE.'
  WHERE category_id in ('.$cat_list.')
  ;';
  return $array_from_query($query, 'image_id');
}

?>