X-Git-Url: https://git.nubati.net/cgi-bin/gitweb.cgi?p=phpfspot.git;a=blobdiff_plain;f=phpfspot.class.php;h=6c150fa6c70ca9c97862ffb9c6d0a49ef55b1b23;hp=878226b99d3eb1af5bbf78cd0dccd49f734382da;hb=3e95994d0452a1f24f03c75774b94fbec71aebdd;hpb=6e2d319e3b4fb0aac55413bbcc121669a19e3720

diff --git a/phpfspot.class.php b/phpfspot.class.php
index 878226b..6c150fa 100644
--- a/phpfspot.class.php
+++ b/phpfspot.class.php
@@ -23,7 +23,6 @@
 
 require_once "phpfspot_cfg.php";
 require_once "phpfspot_db.php";
-require_once "phpfspot_tmpl.php";
 
 class PHPFSPOT {
 
@@ -34,25 +33,47 @@ class PHPFSPOT {
    var $tags;
    var $avail_tags;
 
+   /**
+    * class constructor
+    *
+    * this function will be called on class construct
+    * and will check requirements, loads configuration,
+    * open databases and start the user session
+    */
    public function __construct()
    {
+      $this->cfg = new PHPFSPOT_CFG;
+
+      /* set application name and version information */
+      $this->cfg->product = "phpfspot";
+      $this->cfg->version = "1.1";
+
       /* Check necessary requirements */
       if(!$this->checkRequirements()) {
          exit(1);
       }
 
-      $this->cfg = new PHPFSPOT_CFG;
-
-      $this->db  = new PHPFSPOT_DB(&$this, $this->cfg->fspot_db);
+      $this->db  = new PHPFSPOT_DB($this, $this->cfg->fspot_db);
       
       if(!is_writeable(dirname($this->cfg->phpfspot_db))) {
          print dirname($this->cfg->phpfspot_db) .": directory is not writeable!";
          exit(1);
       }
          
-      $this->cfg_db = new PHPFSPOT_DB(&$this, $this->cfg->phpfspot_db);
+      $this->cfg_db = new PHPFSPOT_DB($this, $this->cfg->phpfspot_db);
+      if(!is_writeable($this->cfg->phpfspot_db)) {
+         print $this->cfg->phpfspot_db ." is not writeable for user ". $this->getuid() ."\n";
+         exit(1);
+      }
       $this->check_config_table();
 
+      /* include Smarty template engine */
+      if(!$this->check_readable($this->cfg->smarty_path .'/libs/Smarty.class.php')) {
+         exit(1);
+      }
+      require $this->cfg->smarty_path .'/libs/Smarty.class.php';
+      /* overload Smarty class if our own template handler */
+      require_once "phpfspot_tmpl.php";
       $this->tmpl = new PHPFSPOT_TMPL($this);
 
       $this->get_tags();
@@ -62,6 +83,9 @@ class PHPFSPOT {
       if(!isset($_SESSION['tag_condition']))
          $_SESSION['tag_condition'] = 'or';
 
+      if(!isset($_SESSION['sort_order']))
+         $_SESSION['sort_order'] = 'date_asc';
+
       if(!isset($_SESSION['searchfor']))
          $_SESSION['searchfor'] = '';
 
@@ -76,60 +100,99 @@ class PHPFSPOT {
 
    } // __destruct()
 
+   /**
+    * show - generate html output
+    *
+    * this function can be called after the constructor has
+    * prepared everyhing. it will load the index.tpl smarty
+    * template. if necessary it will registere pre-selects
+    * (photo index, photo, tag search, date search) into
+    * users session.
+    */
    public function show()
    {
       $this->tmpl->assign('searchfor', $_SESSION['searchfor']);
       $this->tmpl->assign('page_title', $this->cfg->page_title);
       $this->tmpl->assign('current_condition', $_SESSION['tag_condition']);
+      $this->tmpl->assign('template_path', 'themes/'. $this->cfg->theme_name);
 
       $_SESSION['start_action'] = $_GET['mode'];
 
       switch($_GET['mode']) {
          case 'showpi':
             if(isset($_GET['tags'])) {
-               $_SESSION['selected_tags'] = split(',', $_GET['tags']);
+               $_SESSION['selected_tags'] = $this->extractTags($_GET['tags']);
             }
-            if(isset($_GET['from_date'])) {
-               $_SESSION['from_date'] = $_GET['from_date'];
+            if(isset($_GET['from_date']) && $this->isValidDate($_GET['from_date'])) {
+               $_SESSION['from_date'] = strtotime($_GET['from_date'] ." 00:00:00");
             }
-            if(isset($_GET['to_date'])) {
-               $_SESSION['to_date'] = $_GET['to_date'];
+            if(isset($_GET['to_date']) && $this->isValidDate($_GET['to_date'])) {
+               $_SESSION['to_date'] = strtotime($_GET['to_date'] ." 23:59:59");
             }
             break;
          case 'showp':
             if(isset($_GET['tags'])) {
-               $_SESSION['selected_tags'] = split(',', $_GET['tags']);
+               $_SESSION['selected_tags'] = $this->extractTags($_GET['tags']);
                $_SESSION['start_action'] = 'showp';
             }
-            if(isset($_GET['id'])) {
+            if(isset($_GET['id']) && is_numeric($_GET['id'])) {
                $_SESSION['current_photo'] = $_GET['id'];
                $_SESSION['start_action'] = 'showp';
             }
-            if(isset($_GET['from_date'])) {
-               $_SESSION['from_date'] = $_GET['from_date'];
+            if(isset($_GET['from_date']) && $this->isValidDate($_GET['from_date'])) {
+               $_SESSION['from_date'] = strtotime($_GET['from_date']);
             }
-            if(isset($_GET['to_date'])) {
-               $_SESSION['to_date'] = $_GET['to_date'];
+            if(isset($_GET['to_date']) && $this->isValidDate($_GET['to_date'])) {
+               $_SESSION['to_date'] = strtotime($_GET['to_date']);
             }
             break;
          case 'export':
             $this->tmpl->show("export.tpl");
             return;
             break;
-
+         case 'slideshow':
+            $this->tmpl->show("slideshow.tpl");
+            return;
+            break;
+         case 'rss':
+            if(isset($_GET['tags'])) {
+               $_SESSION['selected_tags'] = $this->extractTags($_GET['tags']);
+            }
+            if(isset($_GET['from_date']) && $this->isValidDate($_GET['from_date'])) {
+               $_SESSION['from_date'] = strtotime($_GET['from_date'] ." 00:00:00");
+            }
+            if(isset($_GET['to_date']) && $this->isValidDate($_GET['to_date'])) {
+               $_SESSION['to_date'] = strtotime($_GET['to_date'] ." 23:59:59");
+            }
+            $this->getRSSFeed();
+            return;
+            break;
       }
 
+      if(isset($_SESSION['from_date']) && isset($_SESSION['to_date']))
+         $this->tmpl->assign('date_search_enabled', true);
+
       $this->tmpl->assign('from_date', $this->get_calendar('from'));
       $this->tmpl->assign('to_date', $this->get_calendar('to'));
+      $this->tmpl->assign('sort_field', $this->get_sort_field());
       $this->tmpl->assign('content_page', 'welcome.tpl');
       $this->tmpl->show("index.tpl");
 
-
    } // show()
 
+   /**
+    * get_tags - grab all tags of f-spot's database
+    *
+    * this function will get all available tags from
+    * the f-spot database and store them within two
+    * arrays within this clase for later usage. in
+    * fact, if the user requests (hide_tags) it will
+    * opt-out some of them.
+    *
+    * this function is getting called once by show()
+    */
    private function get_tags()
    {
-   
       $this->avail_tags = Array();
       $count = 0;
    
@@ -157,6 +220,12 @@ class PHPFSPOT {
 
    } // get_tags()
 
+   /** 
+    * extract all photo details
+    * 
+    * retrieve all available details from f-spot's
+    * database and return them as object
+    */
    public function get_photo_details($idx)
    {
       $result = $this->db->db_query("
@@ -169,36 +238,76 @@ class PHPFSPOT {
 
    } // get_photo_details
 
+   /**
+    * returns aligned photo names 
+    *
+    * this function returns aligned (length) names for
+    * an specific photo. If the length of the name exceeds
+    * $limit the name will be shrinked (...)
+    */
    public function getPhotoName($idx, $limit = 0)
    {
       if($details = $this->get_photo_details($idx)) {
-         $name = $details['name'];
-         if($limit != 0 && strlen($name) > $limit) {
-            $name = substr($name, 0, $limit-5) ."...". substr($name, -($limit-5));
-         }
+         $name = $this->shrink_text($details['name'], $limit);
          return $name;
       }
 
    } // getPhotoName()
 
+   /**
+    * shrink text according provided limit
+    *
+    * If the length of the name exceeds $limit the
+    * text will be shortend and some content in between
+    * will be replaced with "..." 
+    */
+   private function shrink_text($text, $limit)
+   {
+      if($limit != 0 && strlen($text) > $limit) {
+         $text = substr($text, 0, $limit-5) ."...". substr($text, -($limit-5));
+      }
+
+      return $text;
+
+   } // shrink_text();
+
+   /**
+    * translate f-spoth photo path
+    * 
+    * as the full-qualified path recorded in the f-spot database
+    * is usally not the same as on the webserver, this function
+    * will replace the path with that one specified in the cfg
+    */
    public function translate_path($path, $width = 0)
    {  
       return str_replace($this->cfg->path_replace_from, $this->cfg->path_replace_to, $path);
 
    } // translate_path
 
+   /**
+    * control HTML ouput for a single photo
+    *
+    * this function provides all the necessary information
+    * for the single photo template.
+    */
    public function showPhoto($photo)
    {
+      /* get all photos from the current photo selection */
       $all_photos = $this->getPhotoSelection();
       $count = count($all_photos);
 
       for($i = 0; $i < $count; $i++) {
          
-         if($get_next) {
+         // $get_next will be set, when the photo which has to
+         // be displayed has been found - this means that the
+         // next available is in fact the NEXT image (for the
+         // navigation icons) 
+         if(isset($get_next)) {
             $next_img = $all_photos[$i];
             break;
          }
 
+         /* the next photo is our NEXT photo */
          if($all_photos[$i] == $photo) {
             $get_next = 1;
          }
@@ -219,22 +328,23 @@ class PHPFSPOT {
       }
 
       $orig_path = $this->translate_path($details['directory_path']) ."/". $details['name'];
-      $thumb_path = $this->cfg->base_path ."/thumbs/". $this->cfg->photo_width ."_". $this->getMD5($photo);
+      $thumb_path = $this->get_thumb_path($this->cfg->photo_width, $photo);
 
       if(!file_exists($orig_path)) {
-         $this->_warning("Photo ". $orig_path ." does not exist!<br />\n");
+         $this->_error("Photo ". $orig_path ." does not exist!<br />\n");
       }
 
       if(!is_readable($orig_path)) {
-         $this->_warning("Photo ". $orig_path ." is not readable for user ". $this->getuid() ."<br />\n");
+         $this->_error("Photo ". $orig_path ." is not readable for user ". $this->getuid() ."<br />\n");
       }
 
       /* If the thumbnail doesn't exist yet, try to create it */
       if(!file_exists($thumb_path)) {
          $this->gen_thumb($photo, true);
-         $thumb_path = $this->cfg->base_path ."/thumbs/". $this->cfg->photo_width ."_". $this->getMD5($photo);
+         $thumb_path = $this->get_thumb_path($this->cfg->photo_width, $photo);
       }
 
+      /* get f-spot database meta information */
       $meta = $this->get_meta_informations($orig_path);
 
       /* If EXIF data are available, use them */
@@ -246,16 +356,16 @@ class PHPFSPOT {
       }
 
       $meta_date = isset($meta['FileDateTime']) ? strftime("%a %x %X", $meta['FileDateTime']) : "n/a";
-      $meta_make = isset($meta['Make']) ? $meta['Make'] ." ". $meta['Model'] : "n/a";
+      $meta_make = isset($meta['Make']) ? $meta['Make'] ." / ". $meta['Model'] : "n/a";
       $meta_size = isset($meta['FileSize']) ? round($meta['FileSize']/1024, 1) ."kbyte" : "n/a";
 
-      $current_tags = $this->getCurrentTags();
       $extern_link = "index.php?mode=showp&id=". $photo;
+      $current_tags = $this->getCurrentTags();
       if($current_tags != "") {
          $extern_link.= "&tags=". $current_tags;
       }
       if(isset($_SESSION['from_date']) && isset($_SESSION['to_date'])) {
-         $extern_link.= "&from_date=". $_SESSION['from_date'] ."&to_date=". $_SESSION['to_date'];
+         $extern_link.= "&from_date=". $this->ts2str($_SESSION['from_date']) ."&to_date=". $this->ts2str($_SESSION['to_date']);
       }
 
       $this->tmpl->assign('extern_link', $extern_link);
@@ -281,7 +391,7 @@ class PHPFSPOT {
          $this->tmpl->assign('current', $current);
       }
       else {
-         $this->_warning("Can't open file ". $thumb_path ."\n");
+         $this->_error("Can't open file ". $thumb_path ."\n");
          return;
       }
 
@@ -295,13 +405,24 @@ class PHPFSPOT {
          $this->tmpl->assign('next_img', $next_img);
       }
       $this->tmpl->assign('mini_width', $this->cfg->mini_width);
+      $this->tmpl->assign('photo_number', $i);
+      $this->tmpl->assign('photo_count', count($all_photos));
 
       $this->tmpl->show("single_photo.tpl");
 
    } // showPhoto()
 
+   /**
+    * all available tags and tag cloud
+    *
+    * this function outputs all available tags (time ordered)
+    * and in addition output them as tag cloud (tags which have
+    * many photos will appears more then others)
+    */
    public function getAvailableTags()
    {
+      $output = "";
+
       $result = $this->db->db_query("
          SELECT tag_id as id, count(tag_id) as quantity
          FROM photo_tags
@@ -349,12 +470,22 @@ class PHPFSPOT {
           // uncomment if you want sizes in whole %:
          $size = ceil($size);
 
-         print "<a href=\"javascript:Tags('add', ". $key .");\" class=\"tag\" style=\"font-size: ". $size ."%;\">". $this->tags[$key] ."</a>, ";
+         $output.= "<a href=\"javascript:Tags('add', ". $key .");\" class=\"tag\" style=\"font-size: ". $size ."%;\">". $this->tags[$key] ."</a>, ";
 
       }
 
+      $output = substr($output, 0, strlen($output)-2);
+      print $output;
+
    } // getAvailableTags()
 
+   /**
+    * output all selected tags
+    *
+    * this function output all tags which have been selected
+    * by the user. the selected tags are stored in the 
+    * session-variable $_SESSION['selected_tags']
+    */
    public function getSelectedTags()
    {
       $output = "";
@@ -371,11 +502,15 @@ class PHPFSPOT {
 
    } // getSelectedTags()
 
+   /**
+    * add tag to users session variable
+    *
+    * this function will add the specified to users current
+    * tag selection. if a date search has been made before
+    * it will be now cleared
+    */
    public function addTag($tag)
    {
-      // if the result of a date search are displayed, reset them
-      $this->resetDateSearch();
-
       if(!isset($_SESSION['selected_tags']))
          $_SESSION['selected_tags'] = Array();
 
@@ -384,6 +519,12 @@ class PHPFSPOT {
    
    } // addTag()
 
+   /**
+    * remove tag to users session variable
+    *
+    * this function removes the specified tag from
+    * users current tag selection
+    */
    public function delTag($tag)
    {
       if(isset($_SESSION['selected_tags'])) {
@@ -394,6 +535,12 @@ class PHPFSPOT {
 
    } // delTag()
 
+   /**
+    * reset tag selection
+    *
+    * if there is any tag selection, it will be
+    * deleted now
+    */
    public function resetTags()
    {
       if(isset($_SESSION['selected_tags']))
@@ -401,6 +548,12 @@ class PHPFSPOT {
 
    } // resetTags()
 
+   /**
+    * reset single photo
+    *
+    * if a specific photo was requested (external link)
+    * unset the session variable now
+    */
    public function resetPhotoView()
    {
       if(isset($_SESSION['current_photo']))
@@ -408,6 +561,12 @@ class PHPFSPOT {
 
    } // resetPhotoView();
 
+   /**
+    * reset tag search
+    *
+    * if any tag search has taken place, reset
+    * it now
+    */
    public function resetTagSearch()
    {
       if(isset($_SESSION['searchfor']))
@@ -415,6 +574,12 @@ class PHPFSPOT {
 
    } // resetTagSearch()
 
+    /**
+    * reset date search
+    *
+    * if any date search has taken place, reset
+    * it now
+    */
    public function resetDateSearch()
    {
       if(isset($_SESSION['from_date']))
@@ -424,22 +589,49 @@ class PHPFSPOT {
 
    } // resetDateSearch();
 
+   /**
+    * return all photo according selection
+    *
+    * this function returns all photos based on
+    * the tag-selection, tag- or date-search.
+    * the tag-search also has to take care of AND
+    * and OR conjunctions
+    */
    public function getPhotoSelection()
    {  
       $matched_photos = Array();
 
+      if(isset($_SESSION['from_date']) && isset($_SESSION['to_date'])) {
+         $from_date = $_SESSION['from_date'];
+         $to_date = $_SESSION['to_date'];
+         $additional_where_cond = "
+               p.time>='". $from_date ."'
+            AND
+               p.time<='". $to_date ."'
+         ";
+      } 
+
+      if(isset($_SESSION['sort_order'])) {
+         $order_str = $this->get_sort_order();
+      }
+
       /* return a search result */
       if(isset($_SESSION['searchfor']) && $_SESSION['searchfor'] != '') {
-         $result = $this->db->db_query("
+         $query_str = "
             SELECT DISTINCT photo_id
                FROM photo_tags pt
             INNER JOIN photos p
                ON p.id=pt.photo_id
             INNER JOIN tags t
                ON pt.tag_id=t.id
-            WHERE t.name LIKE '%". $_SESSION['searchfor'] ."%'
-               ORDER BY p.time ASC
-         ");
+            WHERE t.name LIKE '%". $_SESSION['searchfor'] ."%'";
+
+         if(isset($additional_where_cond))
+            $query_str.= "AND ". $additional_where_cond ." ";
+         if(isset($order_str))
+            $query_str.= $order_str;
+
+         $result = $this->db->db_query($query_str);
          while($row = $this->db->db_fetch_object($result)) {
             array_push($matched_photos, $row['photo_id']);
          }
@@ -454,14 +646,17 @@ class PHPFSPOT {
          $selected = substr($selected, 0, strlen($selected)-1);
 
          if($_SESSION['tag_condition'] == 'or') {
-            $result = $this->db->db_query("
+            $query_str = "
                SELECT DISTINCT photo_id
                   FROM photo_tags pt
                INNER JOIN photos p
                   ON p.id=pt.photo_id
                WHERE pt.tag_id IN (". $selected .")
-               ORDER BY p.time ASC
-            ");
+            ";
+            if(isset($additional_where_cond)) 
+               $query_str.= "AND ". $additional_where_cond ." ";
+            if(isset($order_str))
+               $query_str.= $order_str;
          }
          elseif($_SESSION['tag_condition'] == 'and') {
 
@@ -491,49 +686,42 @@ class PHPFSPOT {
                      ON pt1.photo_id=pt". ($i+2) .".photo_id
                ";
             }
+            $query_str.= "
+               INNER JOIN photos p
+                  ON pt1.photo_id=p.id
+            ";
             $query_str.= "WHERE pt1.tag_id=". $_SESSION['selected_tags'][0];
             for($i = 1; $i < count($_SESSION['selected_tags']); $i++) {
                $query_str.= "
                   AND pt". ($i+1) .".tag_id=". $_SESSION['selected_tags'][$i] ."
                "; 
             }
-            $result = $this->db->db_query($query_str);
+            if(isset($additional_where_cond)) 
+               $query_str.= "AND ". $additional_where_cond;
+            if(isset($order_str))
+               $query_str.= $order_str;
          }
 
+         $result = $this->db->db_query($query_str);
          while($row = $this->db->db_fetch_object($result)) {
             array_push($matched_photos, $row['photo_id']);
          }
          return $matched_photos;
       }
 
-      if(isset($_SESSION['from_date']) && isset($_SESSION['to_date'])) {
-         $from_date = strtotime($_SESSION['from_date']);
-         $to_date = strtotime($_SESSION['to_date']);
-         $result = $this->db->db_query("
-            SELECT DISTINCT photo_id
-               FROM photo_tags pt
-            INNER JOIN photos p
-               ON p.id=pt.photo_id
-            WHERE 
-               time>='". $from_date ."'
-            AND
-               time<='". $to_date ."'
-            ORDER BY p.time ASC
-         ");
-         while($row = $this->db->db_fetch_object($result)) {
-            array_push($matched_photos, $row['photo_id']);
-         }
-         return $matched_photos;
-      } 
-
       /* return all available photos */
-      $result = $this->db->db_query("
+      $query_str = "
          SELECT DISTINCT photo_id
             FROM photo_tags pt
          INNER JOIN photos p
             ON p.id=pt.photo_id
-         ORDER BY p.time ASC
-      ");
+      ";
+      if(isset($additional_where_cond)) 
+         $query_str.= "WHERE ". $additional_where_cond ." ";
+      if(isset($order_str))
+         $query_str.= $order_str;
+
+      $result = $this->db->db_query($query_str);
       while($row = $this->db->db_fetch_object($result)) {
          array_push($matched_photos, $row['photo_id']);
       }
@@ -541,6 +729,12 @@ class PHPFSPOT {
 
    } // getPhotoSelection()
 
+    /**
+    * control HTML ouput for photo index
+    *
+    * this function provides all the necessary information
+    * for the photo index template.
+    */
    public function showPhotoIndex()
    {
       $photos = $this->getPhotoSelection();
@@ -597,7 +791,7 @@ class PHPFSPOT {
          $img_name[$rows][$cols] = htmlspecialchars($this->getPhotoName($photos[$i], 15));
          $img_title[$rows][$cols] = "Click to view photo ". htmlspecialchars($this->getPhotoName($photos[$i], 0));
 
-         $thumb_path = $this->cfg->base_path ."/thumbs/". $this->cfg->thumb_width ."_". $this->getMD5($photos[$i]);
+         $thumb_path = $this->get_thumb_path($this->cfg->thumb_width, $photos[$i]);
 
          if(file_exists($thumb_path)) {
             $info = getimagesize($thumb_path); 
@@ -623,6 +817,15 @@ class PHPFSPOT {
       if(isset($_SESSION['searchfor']) && $_SESSION['searchfor'] != '')
          $this->tmpl->assign('searchfor', $_SESSION['searchfor']);
 
+      if(isset($_SESSION['from_date']) && isset($_SESSION['to_date'])) {
+         $this->tmpl->assign('from_date', $this->ts2str($_SESSION['from_date']));
+         $this->tmpl->assign('to_date', $this->ts2str($_SESSION['to_date']));
+      }
+
+      if(isset($_SESSION['selected_tags']) && !empty($_SESSION['selected_tags'])) {
+         $this->tmpl->assign('tag_result', 1);
+      }
+
       /* do we have to display the page selector ? */
       if($this->cfg->rows_per_page != 0) {
       
@@ -648,10 +851,12 @@ class PHPFSPOT {
             }
          } 
 
+         $dotdot_made = 0;
+
          for($i = 1; $i <= $last_page; $i++) {
 
             if($current_page == $i)
-               $style = "style=\"font-size: 125%;\"";
+               $style = "style=\"font-size: 125%; text-decoration: underline;\"";
             elseif($current_page-1 == $i || $current_page+1 == $i)
                $style = "style=\"font-size: 105%;\"";
             elseif(($current_page-5 >= $i) && ($i != 1) ||
@@ -682,12 +887,16 @@ class PHPFSPOT {
                   $i == $current_page+3 || $i == $current_page+2 || $i == $current_page+1 /* three after */) {
 
                   $page_select.= $select;
+                  $dotdot_made = 0;
                   continue;
 
                }
             }
 
-            $page_select.= ".";
+            if(!$dotdot_made) {
+               $page_select.= ".........&nbsp;";
+               $dotdot_made = 1;
+            }
          }
 
          /* only show the page selector if we have more then one page */
@@ -698,17 +907,23 @@ class PHPFSPOT {
       
       $current_tags = $this->getCurrentTags();
       $extern_link = "index.php?mode=showpi";
+      $rss_link = "index.php?mode=rss";
       if($current_tags != "") {
          $extern_link.= "&tags=". $current_tags;
+         $rss_link.= "&tags=". $current_tags;
       }
       if(isset($_SESSION['from_date']) && isset($_SESSION['to_date'])) {
-         $extern_link.= "&from_date=". $_SESSION['from_date'] ."&to_date=". $_SESSION['to_date'];
+         $extern_link.= "&from_date=". $this->ts2str($_SESSION['from_date']) ."&to_date=". $this->ts2str($_SESSION['to_date']);
+         $rss_link.= "&from_date=". $this->ts2str($_SESSION['from_date']) ."&to_date=". $this->ts2str($_SESSION['to_date']);
       }
 
       $export_link = "index.php?mode=export";
+      $slideshow_link = "index.php?mode=slideshow";
 
       $this->tmpl->assign('extern_link', $extern_link);
+      $this->tmpl->assign('slideshow_link', $slideshow_link);
       $this->tmpl->assign('export_link', $export_link);
+      $this->tmpl->assign('rss_link', $rss_link);
       $this->tmpl->assign('count', $count);
       $this->tmpl->assign('width', $this->cfg->thumb_width);
       $this->tmpl->assign('images', $images);
@@ -727,6 +942,9 @@ class PHPFSPOT {
 
    } // showPhotoIndex()
 
+   /**
+    * show credit template
+    */
    public function showCredits()
    {
       $this->tmpl->assign('version', $this->cfg->version);
@@ -735,6 +953,14 @@ class PHPFSPOT {
 
    } // showCredits()
 
+   /**
+    * create_thumbnails for the requested width
+    *
+    * this function creates image thumbnails of $orig_image
+    * stored as $thumb_image. It will check if the image is
+    * in a supported format, if necessary rotate the image
+    * (based on EXIF orientation meta headers) and re-sizing.
+    */
    public function create_thumbnail($orig_image, $thumb_image, $width)
    {  
       if(!file_exists($orig_image)) {
@@ -870,12 +1096,22 @@ class PHPFSPOT {
 
    } // create_thumbnail()
 
+   /**
+    * return all exif meta data from the file
+    */
    public function get_meta_informations($file)
    {
       return exif_read_data($file);
 
    } // get_meta_informations()
 
+   /**
+    * create phpfspot own sqlite database
+    *
+    * this function creates phpfspots own sqlite database
+    * if it does not exist yet. this own is used to store
+    * some necessary informations (md5 sum's, ...).
+    */
    public function check_config_table()
    {
       // if the config table doesn't exist yet, create it
@@ -918,22 +1154,27 @@ class PHPFSPOT {
       $full_path = $this->translate_path($details['directory_path'])  ."/". $details['name'];
 
       if(!file_exists($full_path)) {
-         $this->_warning("File ". $full_path ." does not exist\n");
+         $this->_error("File ". $full_path ." does not exist\n");
          return;
       }
 
       if(!is_readable($full_path)) {
-         $this->_warning("File ". $full_path ." is not readable for ". $this->getuid() ."\n");
+         $this->_error("File ". $full_path ." is not readable for ". $this->getuid() ."\n");
          return;
       }
 
       $file_md5 = md5_file($full_path);
 
-      $this->_debug("Image [". $idx ."] ". $details['name'] ." Thumbnails:");
+      $this->_debug("Image [". $idx ."] ". $this->shrink_text($details['name'], 20) ." Thumbnails:");
 
       foreach($resolutions as $resolution) {
 
-         $thumb_path = $this->cfg->base_path ."/thumbs/". $resolution ."_". $file_md5;
+         $thumb_sub_path = substr($file_md5, 0, 2);
+         $thumb_path = $this->cfg->thumb_path ."/". $thumb_sub_path ."/". $resolution ."_". $file_md5;
+
+         if(!file_exists(dirname($thumb_path))) {
+            mkdir(dirname($thumb_path), 0755);
+         }
 
          /* if the thumbnail file doesn't exist, create it */
          if(!file_exists($thumb_path)) {
@@ -961,6 +1202,12 @@ class PHPFSPOT {
 
    } // gen_thumb()
 
+   /**
+    * returns stored md5 sum for a specific photo
+    *
+    * this function queries the phpfspot database for a
+    * stored MD5 checksum of the specified photo
+    */
    public function getMD5($idx)
    {
       $result = $this->cfg_db->db_query("
@@ -977,6 +1224,9 @@ class PHPFSPOT {
       
    } // getMD5()
 
+   /**
+    * set MD5 sum for the specific photo
+    */
    private function setMD5($idx, $md5)
    {
       $result = $this->cfg_db->db_exec("
@@ -986,38 +1236,62 @@ class PHPFSPOT {
 
    } // setMD5()
 
+   /**
+    * store current tag condition
+    *
+    * this function stores the current tag condition
+    * (AND or OR) in the users session variables
+    */
    public function setTagCondition($mode)
    {
       $_SESSION['tag_condition'] = $mode;
 
    } // setTagCondition()
 
-   public function startTagSearch($searchfor)
+   /** 
+    * invoke tag & date search 
+    *
+    * this function will return all matching tags and store
+    * them in the session variable selected_tags. furthermore
+    * it also handles the date search.
+    * getPhotoSelection() will then only return the matching
+    * photos.
+    */
+   public function startSearch($searchfor, $sort_order, $from = 0, $to = 0)
    {
       $_SESSION['searchfor'] = $searchfor;
-      $_SESSION['selected_tags'] = Array();
+      $_SESSION['sort_order'] = $sort_order;
+      if($from != 0)
+         $_SESSION['from_date'] = strtotime($from);
+      else
+         unset($_SESSION['from_date']);
+      if($to != 0)
+         $_SESSION['to_date'] = strtotime($to);
+      else
+         unset($_SESSION['to_date']);
 
-      foreach($this->avail_tags as $tag) {
-         if(preg_match('/'. $searchfor .'/i', $this->tags[$tag]))
-            array_push($_SESSION['selected_tags'], $tag);
+      if($searchfor != "") {
+         /* new search, reset the current selected tags */
+         $_SESSION['selected_tags'] = Array();
+         foreach($this->avail_tags as $tag) {
+            if(preg_match('/'. $searchfor .'/i', $this->tags[$tag]))
+               array_push($_SESSION['selected_tags'], $tag);
+         }
       }
 
-      $this->resetDateSearch();
-
-   } // startTagSearch()
-
-   public function startDateSearch($from, $to)
-   {
-      $_SESSION['from_date'] = $from;
-      $_SESSION['to_date'] = $to;
-   }
+   } // startSearch()
 
+   /**
+    * rotate image
+    *
+    * this function rotates the image according the
+    * specified angel.
+    */
    private function rotateImage($img, $degrees)
    {
-      if(function_exists("imagerotate"))
+      if(function_exists("imagerotate")) {
          $img = imagerotate($img, $degrees, 0);
-      else
-      {
+      } else {
          function imagerotate($src_img, $angle)
          {
             $src_x = imagesx($src_img);
@@ -1067,7 +1341,9 @@ class PHPFSPOT {
                   }
                   break;
 
-               default: $rotate = $src_img;
+               default:
+                  $rotate = $src_img;
+                  break;
             };
 
             return $rotate;
@@ -1082,6 +1358,9 @@ class PHPFSPOT {
 
    } // rotateImage()
 
+   /**
+    * return all assigned tags for the specified photo
+    */
    private function get_photo_tags($idx)
    {
       $result = $this->db->db_query("
@@ -1101,6 +1380,9 @@ class PHPFSPOT {
 
    } // get_photo_tags()
 
+   /**
+    * create on-the-fly images with text within
+    */
    public function showTextImage($txt, $color=000000, $space=4, $font=4, $w=300)
    {
       if (strlen($color) != 6) 
@@ -1127,6 +1409,9 @@ class PHPFSPOT {
 
    } // showTextImage()
 
+   /**
+    * check if all requirements are met
+    */
    private function checkRequirements()
    {
       if(!function_exists("imagecreatefromjpeg")) {
@@ -1134,7 +1419,7 @@ class PHPFSPOT {
          $missing = true;
       }
 
-      if(!function_exists("sqlite3_open")) {
+      if($this->cfg->db_access == "native" && !function_exists("sqlite3_open")) {
          print "PHP SQLite3 library extension is missing<br />\n";
          $missing = true;
       }
@@ -1168,6 +1453,9 @@ class PHPFSPOT {
 
    } // _debug()
 
+   /**
+    * check if specified MIME type is supported
+    */
    public function checkifImageSupported($mime)
    {
       if(in_array($mime, Array("image/jpeg")))
@@ -1177,26 +1465,48 @@ class PHPFSPOT {
 
    } // checkifImageSupported()
 
-   public function _warning($text)
+   public function _error($text)
    {
-      print "<img src=\"resources/green_info.png\" alt=\"warning\" />\n";
-      print $text;
+      switch($this->cfg->logging) {
+         case 'display':
+            print "<img src=\"resources/green_info.png\" alt=\"warning\" />\n";
+            print $text;
+            break;
+         case 'errorlog':  
+            error_log($text);
+            break;
+         case 'logfile':
+            error_log($text, 3, $his->cfg->log_file);
+            break;
+      }
 
-   } // _warning()
+   } // _error()
 
+   /**
+    * output calendard input fields
+    */
    private function get_calendar($mode)
    {
-      $year = $_SESSION[$mode .'_date'] ? date("Y", strtotime($_SESSION[$mode .'_date'])) : date("Y");
-      $month = $_SESSION[$mode .'_date'] ? date("m", strtotime($_SESSION[$mode .'_date'])) : date("m");
-      $day = $_SESSION[$mode .'_date'] ? date("d", strtotime($_SESSION[$mode .'_date'])) : date("d");
-
-      $output = "<input type=\"text\" size=\"3\" id=\"". $mode ."year\" value=\"". $year ."\" />\n";
-      $output.= "<input type=\"text\" size=\"1\" id=\"". $mode ."month\" value=\"". $month ."\" />\n";
-      $output.= "<input type=\"text\" size=\"1\" id=\"". $mode ."day\" value=\"". $day ."\" />\n";
+      $year = $_SESSION[$mode .'_date'] ? date("Y", $_SESSION[$mode .'_date']) : date("Y");
+      $month = $_SESSION[$mode .'_date'] ? date("m", $_SESSION[$mode .'_date']) : date("m");
+      $day = $_SESSION[$mode .'_date'] ? date("d", $_SESSION[$mode .'_date']) : date("d");
+
+      $output = "<input type=\"text\" size=\"3\" id=\"". $mode ."year\" value=\"". $year ."\"";
+      if(!isset($_SESSION[$mode .'_date'])) $output.= " disabled=\"disabled\"";
+      $output.= " />\n";
+      $output.= "<input type=\"text\" size=\"1\" id=\"". $mode ."month\" value=\"". $month ."\"";
+      if(!isset($_SESSION[$mode .'_date'])) $output.= " disabled=\"disabled\"";
+      $output.= " />\n";
+      $output.= "<input type=\"text\" size=\"1\" id=\"". $mode ."day\" value=\"". $day ."\"";
+      if(!isset($_SESSION[$mode .'_date'])) $output.= " disabled=\"disabled\"";
+      $output.= " />\n";
       return $output;
 
    } // get_calendar()
 
+   /**
+    * output calendar matrix
+    */
    public function get_calendar_matrix($year = 0, $month = 0, $day = 0)
    {
       if (!isset($year)) $year = date('Y');
@@ -1209,7 +1519,6 @@ class PHPFSPOT {
       require_once CALENDAR_ROOT.'Month/Weekdays.php';
       require_once CALENDAR_ROOT.'Day.php';
 
-
       // Build the month
       $month = new Calendar_Month_Weekdays($year,$month);
 
@@ -1273,19 +1582,17 @@ class PHPFSPOT {
 
    } // get_calendar_matrix()
 
+   /**
+    * output export page
+    */
    public function getExport($mode)
    {
       $pictures = $this->getPhotoSelection();
       $current_tags = $this->getCurrentTags();  
 
-      if(!isset($_SERVER['HTTPS'])) $protocol = "http";
-      else $protocol = "https";
-
-      $server_name = $_SERVER['SERVER_NAME'];
-
       foreach($pictures as $picture) {
 
-         $orig_url = $protocol ."://". $server_name . $this->cfg->web_path ."index.php?mode=showp&id=". $picture;
+         $orig_url = $this->get_phpfspot_url() ."index.php?mode=showp&id=". $picture;
          if($current_tags != "") {
             $orig_url.= "&tags=". $current_tags;
          } 
@@ -1293,7 +1600,7 @@ class PHPFSPOT {
             $orig_url.= "&from_date=". $_SESSION['from_date'] ."&to_date=". $_SESSION['to_date'];
          }
 
-         $thumb_url = $protocol ."://". $server_name . $this->cfg->web_path ."phpfspot_img.php?idx=". $picture ."&width=". $this->cfg->thumb_width;
+         $thumb_url = $this->get_phpfspot_url() ."phpfspot_img.php?idx=". $picture ."&width=". $this->cfg->thumb_width;
 
          switch($mode) {
 
@@ -1303,8 +1610,13 @@ class PHPFSPOT {
                break;
                
             case 'MoinMoin':
-               // [%pictureurl% %thumbnailurl%]
-               print htmlspecialchars(" * [".$orig_url." ".$thumb_url."&fake=1.jpg]") ."<br />\n";
+               // "[%pictureurl% %thumbnailurl%]"
+               print htmlspecialchars("[".$orig_url." ".$thumb_url."&fake=1.jpg]") ."<br />\n";
+               break;
+
+            case 'MoinMoinList':
+               // " * [%pictureurl% %thumbnailurl%]"
+               print "&nbsp;" . htmlspecialchars("* [".$orig_url." ".$thumb_url."&fake=1.jpg]") ."<br />\n";
                break;
          }
 
@@ -1312,6 +1624,77 @@ class PHPFSPOT {
 
    } // getExport()
 
+   /**
+    * output RSS feed
+    */
+   public function getRSSFeed()
+   {
+      Header("Content-type: text/xml; charset=utf-8");
+      print "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";
+?>
+<rss version="2.0"
+   xmlns:media="http://search.yahoo.com/mrss/"
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+ >
+ <channel>
+  <title>phpfspot</title>
+  <description>phpfspot RSS feed</description>
+  <link><?php print htmlspecialchars($this->get_phpfspot_url()); ?></link>
+  <pubDate><?php print strftime("%a, %d %b %Y %T %z"); ?></pubDate>
+  <generator>phpfspot</generator>
+<?php
+
+      $pictures = $this->getPhotoSelection();
+      $current_tags = $this->getCurrentTags();  
+
+      foreach($pictures as $picture) {
+
+         $orig_url = $this->get_phpfspot_url() ."index.php?mode=showp&id=". $picture;
+         if($current_tags != "") {
+            $orig_url.= "&tags=". $current_tags;
+         } 
+         if(isset($_SESSION['from_date']) && isset($_SESSION['to_date'])) {
+            $orig_url.= "&from_date=". $_SESSION['from_date'] ."&to_date=". $_SESSION['to_date'];
+         }
+
+         $details = $this->get_photo_details($picture);
+
+         $thumb_url = $this->get_phpfspot_url() ."phpfspot_img.php?idx=". $picture ."&width=". $this->cfg->thumb_width;
+         $thumb_html = htmlspecialchars("
+<a href=\"". $orig_url ."\"><img src=\"". $thumb_url ."\" /></a>
+<br>
+". $details['description']);
+
+         $orig_path = $this->translate_path($details['directory_path']) ."/". $details['name'];
+         $meta = $this->get_meta_informations($orig_path);
+         $meta_date = isset($meta['FileDateTime']) ? $meta['FileDateTime'] : filemtime($orig_path);
+
+?>
+  <item>
+   <title><?php print htmlspecialchars($details['name']); ?></title>
+   <link><?php print htmlspecialchars($orig_url); ?></link>
+   <guid><?php print htmlspecialchars($orig_url); ?></guid>
+   <dc:date.Taken><?php print strftime("%Y-%m-%dT%H:%M:%S+00:00", $meta_date); ?></dc:date.Taken>
+   <description>
+    <?php print $thumb_html; ?> 
+   </description>
+   <pubDate><?php print strftime("%a, %d %b %Y %T %z", $meta_date); ?></pubDate>
+  </item>
+<?php
+
+      }
+?>
+ </channel>
+</rss>
+<?php
+
+
+   } // getExport()
+
+ 
+   /**
+    * return all selected tags as one string
+    */
    private function getCurrentTags()
    {
       $current_tags = "";
@@ -1324,6 +1707,9 @@ class PHPFSPOT {
 
    } // getCurrentTags()
 
+   /**
+    * return the current photo
+    */
    public function getCurrentPhoto()
    {
       if(isset($_SESSION['current_photo'])) {
@@ -1331,17 +1717,23 @@ class PHPFSPOT {
       }
    } // getCurrentPhoto()
 
+   /**
+    * tells the client browser what to do
+    *
+    * this function is getting called via AJAX by the
+    * client browsers. it will tell them what they have
+    * to do next. This is necessary for directly jumping
+    * into photo index or single photo view when the are
+    * requested with specific URLs
+    */
    public function whatToDo()
    {
-      if(isset($_SESSION['selected_tags']) && !empty($_SESSION['selected_tags'])) {
-         return "showpi_tags";
-      }
-      elseif(isset($_SESSION['from_date']) && isset($_SESSION['to_date'])) {
-         return "showpi_date";
-      }
-      elseif(isset($_SESSION['current_photo'])) {
+      if(isset($_SESSION['current_photo']) && $_SESSION['start_action'] == 'showp') {
          return "show_photo";
       }
+      elseif(isset($_SESSION['selected_tags']) && !empty($_SESSION['selected_tags'])) {
+         return "showpi_tags";
+      }
       elseif(isset($_SESSION['start_action']) && $_SESSION['start_action'] == 'showpi') {
          return "showpi";
       }
@@ -1350,6 +1742,9 @@ class PHPFSPOT {
 
    } // whatToDo()
 
+   /**
+    * return the current process-user
+    */
    private function getuid()
    {
       if($uid = posix_getuid()) {
@@ -1362,6 +1757,226 @@ class PHPFSPOT {
    
    } // getuid()
 
+   /**
+    * returns a select-dropdown box to select photo index sort parameters
+    */
+   private function get_sort_field()
+   {
+      $output = "<select name=\"sort_order\">";
+      foreach(array('date_asc', 'date_desc', 'name_asc', 'name_desc') as $sort_order) {
+         $output.= "<option value=\"". $sort_order ."\"";
+         if($sort_order == $_SESSION['sort_order']) {
+            $output.= " selected=\"selected\"";
+         }
+         $output.= ">". $sort_order ."</option>";
+      }
+      $output.= "</select>";
+      return $output;
+
+   } // get_sort_field()
+
+   /**
+    * returns the currently selected sort order
+    */ 
+   private function get_sort_order()
+   {
+      switch($_SESSION['sort_order']) {
+         case 'date_asc':
+            return " ORDER BY p.time ASC";
+            break;
+         case 'date_desc':
+            return " ORDER BY p.time DESC";
+            break;
+         case 'name_asc':
+            return " ORDER BY p.name ASC";
+            break;
+         case 'name_desc':
+            return " ORDER BY p.name DESC";
+            break;
+      }
+
+   } // get_sort_order()
+
+   /***
+     * return the next to be shown slide show image
+     *
+     * this function returns the URL of the next image
+     * in the slideshow sequence.
+     */
+   public function getNextSlideShowImage()
+   {
+      $all_photos = $this->getPhotoSelection();
+
+      if(!isset($_SESSION['slideshow_img']) || $_SESSION['slideshow_img'] == count($all_photos)-1) 
+         $_SESSION['slideshow_img'] = 0;
+      else
+         $_SESSION['slideshow_img']++;
+
+      return $this->get_phpfspot_url() ."phpfspot_img.php?idx=". $all_photos[$_SESSION['slideshow_img']] ."&width=". $this->cfg->photo_width;
+
+   } // getNextSlideShowImage()
+
+   /***
+     * return the previous to be shown slide show image
+     *
+     * this function returns the URL of the previous image
+     * in the slideshow sequence.
+     */
+   public function getPrevSlideShowImage()
+   {
+      $all_photos = $this->getPhotoSelection();
+
+      if(!isset($_SESSION['slideshow_img']) || $_SESSION['slideshow_img'] == 0)
+         $_SESSION['slideshow_img'] = 0;
+      else
+         $_SESSION['slideshow_img']--;
+
+      return $this->get_phpfspot_url() ."phpfspot_img.php?idx=". $all_photos[$_SESSION['slideshow_img']] ."&width=". $this->cfg->photo_width;
+
+   } // getPrevSlideShowImage()
+
+   public function resetSlideShow()
+   {
+      if(isset($_SESSION['slideshow_img']))
+         unset($_SESSION['slideshow_img']);
+   } // resetSlideShow()
+   
+   /***
+     * get random photo
+     *
+     * this function will get all photos from the fspot
+     * database and randomly return ONE entry
+     *
+     * saddly there is yet no sqlite3 function which returns
+     * the bulk result in array, so we have to fill up our
+     * own here.
+     */ 
+   public function get_random_photo()
+   {
+      $all = Array();
+
+      $result = $this->db->db_query("
+         SELECT id
+         FROM photos
+      ");
+      
+      while($row = $this->db->db_fetch_object($result)) {
+         array_push($all, $row['id']);
+      }
+
+      return $all[array_rand($all)];
+
+   } // get_random_photo()
+
+   /**
+    * validates provided date
+    *
+    * this function validates if the provided date
+    * contains a valid date and will return true 
+    * if it is.
+    */
+   public function isValidDate($date_str)
+   {
+      $timestamp = strtotime($date_str);
+   
+      if(is_numeric($timestamp))
+         return true;
+      
+      return false;
+
+   } // isValidDate()
+
+   /**
+    * timestamp to string conversion
+    */
+   private function ts2str($timestamp)
+   {
+      return strftime("%Y-%m-%d", $timestamp);
+   } // ts2str()
+
+   private function extractTags($tags_str)
+   {
+      $not_validated = split(',', $_GET['tags']);
+      $validated = array();
+
+      foreach($not_validated as $tag) {
+         if(is_numeric($tag))
+            array_push($validated, $tag);
+      }
+   
+      return $validated;
+   
+   } // extractTags()
+
+   /**
+    * returns the full path to a thumbnail
+    */
+   public function get_thumb_path($width, $photo)
+   {
+      $sub_path = substr($this->getMD5($photo), 0, 2);
+      return $this->cfg->thumb_path
+         . "/"
+         . $sub_path
+         . "/"
+         . $width
+         . "_"
+         . $this->getMD5($photo);
+
+   } // get_thumb_path()
+
+   /**
+    * returns server's virtual host name
+    */
+   private function get_server_name()
+   {
+      return $_SERVER['SERVER_NAME'];
+   } // get_server_name()
+
+   /**
+    * returns type of webprotocol which is
+    * currently used
+    */
+   private function get_web_protocol()
+   {
+      if(!isset($_SERVER['HTTPS']))
+         return "http";
+      else
+         return "https";
+   } // get_web_protocol()
+
+   /**
+    * return url to this phpfspot installation
+    */
+   private function get_phpfspot_url()
+   {
+      return $this->get_web_protocol() ."://". $this->get_server_name() . $this->cfg->web_path;
+   } // get_phpfspot_url()
+   
+   /**
+    * check file exists and is readable
+    *
+    * returns true, if everything is ok, otherwise false
+    * if $silent is not set, this function will output and
+    * error message
+    */
+   private function check_readable($file, $silent = null)
+   {
+      if(!file_exists($file)) {
+         if(!isset($silent))
+            print "File \"". $file ."\" does not exist.\n";
+         return false;
+      }
+
+      if(!is_readable($file)) {
+         if(!isset($silent))
+            print "File \"". $file ."\" is not reachable for user ". $this->getuid() ."\n";
+         return false;
+      }
+
+      return true;
+
+   } // check_readable()
+
 }
 
 ?>