class.ilExternalMediaAnalyzer.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2001 ILIAS open source, University of Cologne            |
        |                                                                             |
        | 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.                                |
        |                                                                             |
        | 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. |
        +-----------------------------------------------------------------------------+
*/

class ilExternalMediaAnalyzer
{
        static function isYouTube($a_location)
        {
                if (strpos($a_location, "youtube.com") > 0)
                {
                        return true;
                }
                return false;
        }
        
        static function extractYouTubeParameters($a_location)
        {
                $par = array();
                $pos1 = strpos($a_location, "v=");
                $pos2 = strpos($a_location, "&", $pos1);
                if ($pos1 > 0)
                {
                        $len = ($pos2 > 0)
                                ? $pos2
                                : strlen($a_location);
                        $par["v"] = substr($a_location, $pos1+2, $len - ($pos1+2));
                }

                return $par;
        }

        static function isFlickr($a_location)
        {
                if (strpos($a_location, "flickr.com") > 0)
                {
                        return true;
                }
                return false;
        }

        static function extractFlickrParameters($a_location)
        {
                $par = array();
                $pos1 = strpos($a_location, "flickr.com/photos/");
                $pos2 = strpos($a_location, "/", $pos1+18);
                if ($pos1 > 0)
                {
                        $len = ($pos2 > 0)
                                ? $pos2
                                : $a_location;
                        $par["user_id"] = substr($a_location, $pos1+18, $len - ($pos1+18));
                }
                
                // tags
                $pos1 = strpos($a_location, "/tags/");
                $pos2 = strpos($a_location, "/", $pos1+6);
                if ($pos1 > 0)
                {
                        $len = ($pos2 > 0)
                                ? $pos2
                                : strlen($a_location);
                        $par["tags"] = substr($a_location, $pos1+6, $len - ($pos1+6));
                }

                // sets
                $pos1 = strpos($a_location, "/sets/");
                $pos2 = strpos($a_location, "/", $pos1+6);
                if ($pos1 > 0)
                {
                        $len = ($pos2 > 0)
                                ? $pos2
                                : $a_location;
                        $par["sets"] = substr($a_location, $pos1+6, $len - ($pos1+6));
                }

                return $par;
        }

        static function isGoogleVideo($a_location)
        {
                if (strpos($a_location, "video.google") > 0)
                {
                        return true;
                }
                return false;
        }
        
        static function extractGoogleVideoParameters($a_location)
        {
                $par = array();
                $pos1 = strpos($a_location, "docid=");
                $pos2 = strpos($a_location, "&", $pos1 + 6);
                if ($pos1 > 0)
                {
                        $len = ($pos2 > 0)
                                ? $pos2
                                : strlen($a_location);
                        $par["docid"] = substr($a_location, $pos1+6, $len - ($pos1+6));
                }

                return $par;
        }

        static function isGoogleDocument($a_location)
        {
                if (strpos($a_location, "docs.google") > 0)
                {
                        return true;
                }
                return false;
        }
        
        static function extractGoogleDocumentParameters($a_location)
        {
                $par = array();
                $pos1 = strpos($a_location, "id=");
                $pos2 = strpos($a_location, "&", $pos1 + 3);
                if ($pos1 > 0)
                {
                        $len = ($pos2 > 0)
                                ? $pos2
                                : strlen($a_location);
                        $par["docid"] = substr($a_location, $pos1+3, $len - ($pos1+3));
                }
                $pos1 = strpos($a_location, "docID=");
                $pos2 = strpos($a_location, "&", $pos1 + 6);
                if ($pos1 > 0)
                {
                        $len = ($pos2 > 0)
                                ? $pos2
                                : strlen($a_location);
                        $par["docid"] = substr($a_location, $pos1+6, $len - ($pos1+6));
                }
                if (strpos($a_location, "Presentation?") > 0)
                {
                        $par["type"] = "Presentation";
                }
                if (strpos($a_location, "View?") > 0)
                {
                        $par["type"] = "Document";
                }

                return $par;
        }
        
        static function extractUrlParameters($a_location, $a_parameter)
        {
                if (!is_array($a_parameter))
                {
                        $a_parameter = array();
                }
                
                $ext_par = array();
                
                // YouTube
                if (ilExternalMediaAnalyzer::isYouTube($a_location))
                {
                        $ext_par = ilExternalMediaAnalyzer::extractYouTubeParameters($a_location);
                        $a_parameter = array();
                }

                // Flickr
                if (ilExternalMediaAnalyzer::isFlickr($a_location))
                {
                        $ext_par = ilExternalMediaAnalyzer::extractFlickrParameters($a_location);
                        $a_parameter = array();
                }

                // GoogleVideo
                if (ilExternalMediaAnalyzer::isGoogleVideo($a_location))
                {
                        $ext_par = ilExternalMediaAnalyzer::extractGoogleVideoParameters($a_location);
                        $a_parameter = array();
                }

                // GoogleDocs
                if (ilExternalMediaAnalyzer::isGoogleDocument($a_location))
                {
                        $ext_par = ilExternalMediaAnalyzer::extractGoogleDocumentParameters($a_location);
                        $a_parameter = array();
                }

                foreach($ext_par as $name => $value)
                {
                        $a_parameter[$name] = $value;
                }

                return $a_parameter;
        }
}
?>