docs/home/classes/ContentUtility.class.php

   1 <?php\r
   2 /************************************************************************/\r
   3 /* AContent                                                             */\r
   4 /************************************************************************/\r
   5 /* Copyright (c) 2010                                                   */\r
   6 /* Inclusive Design Institute                                           */\r
   7 /*                                                                      */\r
   8 /* This program is free software. You can redistribute it and/or        */\r
   9 /* modify it under the terms of the GNU General Public License          */\r
  10 /* as published by the Free Software Foundation.                        */\r
  11 /************************************************************************/\r
  12 \r
  13 /**\r
  14 * Content Utility functions \r
  15 * @access       public\r
  16 * @author       Cindy Qi Li\r
  17 */\r
  18 \r
  19 if (!defined('TR_INCLUDE_PATH')) exit;\r
  20 \r
  21 class ContentUtility {\r
  22 \r
  23         /**\r
  24         * This function cuts out html body\r
  25         * @access  public\r
  26         * @param   $text  html text\r
  27         * @author  Cindy Qi Li\r
  28         */\r
  29         public static function getHtmlBody($text) {\r
  30                 /* strip everything before <body> */\r
  31                 $start_pos      = strpos(strtolower($text), '<body');\r
  32                 if ($start_pos !== false) {\r
  33                         $start_pos      += strlen('<body');\r
  34                         $end_pos        = strpos(strtolower($text), '>', $start_pos);\r
  35                         $end_pos        += strlen('>');\r
  36         \r
  37                         $text = substr($text, $end_pos);\r
  38                 }\r
  39         \r
  40                 /* strip everything after </body> */\r
  41                 $end_pos        = strpos(strtolower($text), '</body>');\r
  42                 if ($end_pos !== false) {\r
  43                         $text = trim(substr($text, 0, $end_pos));\r
  44                 }\r
  45         \r
  46                 return $text;\r
  47         }\r
  48 \r
  49         /**\r
  50         * This function cuts out requested tag information from html head\r
  51         * @access  public\r
  52         * @param   $text  html text\r
  53         * @param   $tags  a string or an array of requested tags\r
  54         * @author  Cindy Qi Li\r
  55         */\r
  56         public static function getHtmlHeadByTag($text, $tags)\r
  57         {\r
  58                 $head = ContentUtility::getHtmlHead($text);\r
  59                 $rtn_text = "";\r
  60                 \r
  61                 if (!is_array($tags) && strlen(trim($tags)) > 0)\r
  62                 {\r
  63                         $tags = array(trim($tags));\r
  64                 }\r
  65                 foreach ($tags as $tag)\r
  66                 {\r
  67                         $tag = strtolower($tag);\r
  68         \r
  69                         /* strip everything before <{tag}> */\r
  70                         $start_pos      = stripos($head, '<'.$tag);\r
  71                         $temp_head = $head;\r
  72                         \r
  73                         while ($start_pos !== false) \r
  74                         {\r
  75                                 $temp_text = substr($temp_head, $start_pos);\r
  76                 \r
  77                                 /* strip everything after </{tag}> or />*/\r
  78                                 $end_pos        = stripos($temp_text, '</' . $tag . '>');\r
  79                 \r
  80                                 if ($end_pos !== false) \r
  81                                 {\r
  82                                         $end_pos += strlen('</' . $tag . '>');\r
  83                                         \r
  84                                         // add an empty line after each tag information\r
  85                                         $rtn_text .= trim(substr($temp_text, 0, $end_pos)) . '\r
  86                 \r
  87         ';\r
  88                                 }\r
  89                                 else  // match /> as ending tag if </tag> is not found\r
  90                                 {\r
  91                                         $end_pos        = stripos($temp_text, '/>');\r
  92                                         \r
  93                                         if($end_pos === false && stripos($temp_text, $tag.'>')===false){\r
  94                                                 //if /> is not found, then this is not a valid XHTML\r
  95                                                 //text iff it's not tag>\r
  96                                                 $end_pos = stripos($temp_text, '>');\r
  97                                                 $end_pos += strlen('>');\r
  98                                         } else {\r
  99                                                 $end_pos += strlen('/>');\r
 100                                         }\r
 101                                         // add an empty line after each tag information\r
 102                                         $rtn_text .= trim(substr($temp_text, 0, $end_pos)) . '\r
 103                 \r
 104         ';\r
 105                                 }\r
 106                                 \r
 107                                 // initialize vars for next round of matching\r
 108                                 $temp_head = substr($temp_text, $end_pos);\r
 109                                 $start_pos = stripos($temp_head, '<'.$tag);\r
 110                         }\r
 111                 }\r
 112                 return $rtn_text;\r
 113         }\r
 114 \r
 115         /**\r
 116         * This function cuts out html head\r
 117         * @access  private\r
 118         * @param   $text  html text\r
 119         * @author  Cindy Qi Li\r
 120         */\r
 121         private static function getHtmlHead ($text) {\r
 122                 /* strip everything before <head> */\r
 123                 $start_pos      = stripos($text, '<head');\r
 124                 if ($start_pos !== false) {\r
 125                         $start_pos      += strlen('<head');\r
 126                         $end_pos        = stripos($text, '>', $start_pos);\r
 127                         $end_pos        += strlen('>');\r
 128         \r
 129                         $text = substr($text, $end_pos);\r
 130                 }\r
 131         \r
 132                 /* strip everything after </head> */\r
 133                 $end_pos        = stripos($text, '</head');\r
 134                 if ($end_pos !== false) {\r
 135                         $text = trim(substr($text, 0, $end_pos));\r
 136                 }\r
 137                 return $text;\r
 138         }\r
 139 \r
 140         private static function embedFLV($text) {\r
 141                 global $content_base_href;\r
 142                 \r
 143                 $media_replace = array();\r
 144                 $media_matches = array();\r
 145                 $flowplayerholder_class = "atutor.flowplayerholder";  // style class used to play flowplayer medias\r
 146                 $flowplayerholder_def = '$f("*.'.$flowplayerholder_class.'"';   // javascript definition for atutor.flowplayerholder \r
 147                 \r
 148                 // .flv\r
 149                 preg_match_all("#\[media[0-9a-z\|]*\]([.\w\d]+[^\s\"]+)\.flv\[/media\]#i",$text,$media_matches[],PREG_SET_ORDER);\r
 150                 $media_replace[] ="<object>\n".\r
 151                                   "  <div>\n".\r
 152                                   "    <a class=\"".$flowplayerholder_class."\" style=\"display:block;width:##WIDTH##px;height:##HEIGHT##px;\" href=\"##MEDIA1##.flv\"></a>\n".\r
 153                                   "  </div>\n".\r
 154                                   "  <div style=\"margin-top:-2em;\">\n".\r
 155                                   "    <a href=\"##MEDIA1##.flv\">##MEDIA1##.flv</a>\n".\r
 156                                   "  </div>\n".\r
 157                                   "</object>";\r
 158                 \r
 159                 // .mp4\r
 160                 preg_match_all("#\[media[0-9a-z\|]*\]([.\w\d]+[^\s\"]+)\.mp4\[/media\]#i",$text,$media_matches[],PREG_SET_ORDER);\r
 161                 //$media_replace[] ="<a class=\"".$flowplayerholder_class."\" style=\"display:block;width:##WIDTH##px;height:##HEIGHT##px;\" href=\"".AT_BASE_HREF."get.php/".$_content_base_href."##MEDIA1##.mp4\"></a>";\r
 162                 $media_replace[] ="<object>\n".\r
 163                                   "  <div>\n".\r
 164                                   "    <a class=\"".$flowplayerholder_class."\" style=\"display:block;width:##WIDTH##px;height:##HEIGHT##px;\" href=\"##MEDIA1##.mp4\"></a>\n".\r
 165                                   "  </div>\n".\r
 166                                   "  <div style=\"margin-top:-2em;\">\n".\r
 167                                   "    <a href=\"##MEDIA1##.mp4\">##MEDIA1##.mp4</a>\n".\r
 168                                   "  </div>\n".\r
 169                                   "</object>";\r
 170                 // Executing the replace\r
 171                 for ($i=0;$i<count($media_replace);$i++){\r
 172                         foreach($media_matches[$i] as $media)\r
 173                         {\r
 174                                 //find width and height for each matched media\r
 175                                 if (preg_match("/\[media\|([0-9]*)\|([0-9]*)\]*/", $media[0], $matches)) \r
 176                                 {\r
 177                                         $width = $matches[1];\r
 178                                         $height = $matches[2];\r
 179                                 }\r
 180                                 else\r
 181                                 {\r
 182                                         $width = 425;\r
 183                                         $height = 350;\r
 184                                 }\r
 185                                 \r
 186                                 //replace media tags with embedded media for each media tag\r
 187                                 $media_input = $media_replace[$i];\r
 188                                 $media_input = str_replace("##WIDTH##","$width",$media_input);\r
 189                                 $media_input = str_replace("##HEIGHT##","$height",$media_input);\r
 190                                 $media_input = str_replace("##MEDIA1##","$media[1]",$media_input);\r
 191                                 $media_input = str_replace("##MEDIA2##","$media[2]",$media_input);\r
 192                                 $text = str_replace($media[0],$media_input,$text);\r
 193                         }\r
 194                 }\r
 195                 \r
 196                 // Include the javascript only if:\r
 197                 // 1. $flowplayerholder_class is used but not defined\r
 198                 // 2. exclude from export common cartridge or content package\r
 199                 if (strpos($text, $flowplayerholder_class) \r
 200                     && !strpos($text, $flowplayerholder_def)\r
 201                     && !strpos($_SERVER['PHP_SELF'], "ims_export.php"))\r
 202                 {\r
 203                         $text .= '<script type="text/javascript">\r
 204 '.$flowplayerholder_def.', "'.TR_BASE_HREF.'include/jscripts/flowplayer/flowplayer-3.2.4.swf", { \r
 205   clip: { \r
 206   autoPlay: false,\r
 207   baseUrl: \''.TR_BASE_HREF.'get.php/'.$content_base_href.'\'},\r
 208   plugins:  { \r
 209     controls: { \r
 210       buttons:true, \r
 211       play: true,  \r
 212       scrubber: true, \r
 213       autoHide:false\r
 214     }         \r
 215   }\r
 216 });\r
 217 </script>'."\n";\r
 218                 }\r
 219                 return $text;           \r
 220         }\r
 221         \r
 222     /*\r
 223      * This function converts the youtube playable url used in <object> tag (for instance: http://www.youtube.com/v/a0ryB0m0MiM)\r
 224      * to youtube url that is used to browse (for instance: http://www.youtube.com/watch?v=a0ryB0m0MiM)\r
 225      * @param: youtube playable URL. For instance, http://www.youtube.com/v/a0ryB0m0MiM\r
 226      * @return: if the param is a youtube playable url, return the according youtube URL used to browse. \r
 227      *          For instance: http://www.youtube.com/watch?v=a0ryB0m0MiM\r
 228      *          Otherwise, return the original send-in parameter.\r
 229      */\r
 230     public function convertYoutubePlayURLToWatchURL($youtube_playURL) {\r
 231         return preg_replace("/(http:\/\/[a-z0-9\.]*)?youtube.com\/v\/(.*)/",\r
 232                             "\\1youtube.com/watch?v=\\2", $youtube_playURL);\r
 233     }\r
 234 \r
 235     /*\r
 236      * This function converts the youtube url that is used to browse (for instance: http://www.youtube.com/watch?v=a0ryB0m0MiM)\r
 237      * to youtube playable url used in <object> tag (for instance: http://www.youtube.com/v/a0ryB0m0MiM)\r
 238      * @param: the youtube URL used to browse. \r
 239      *         For instance: http://www.youtube.com/watch?v=a0ryB0m0MiM\r
 240      * @return: if the param is a youtube url used to browse, return the according youtube playable URL. \r
 241      *          For instance, http://www.youtube.com/v/a0ryB0m0MiM\r
 242      *          Otherwise, return the original send-in parameter.\r
 243      */\r
 244     public function convertYoutubeWatchURLToPlayURL($youtube_watchURL) {\r
 245         return preg_replace("/(http:\/\/[a-z0-9\.]*)?youtube.com\/watch\?v=(.*)/",\r
 246                             "\\1youtube.com/v/\\2", $youtube_watchURL);\r
 247     }\r
 248 \r
 249         public static function embedMedia($text) {\r
 250                 if (preg_match("/\[media(\|[0-9]+\|[0-9]+)?\]*/", $text)==0){\r
 251                         return $text;\r
 252                 }\r
 253         \r
 254                 // remove the spaces in [media] tag, otherwise, the next line converts URL inside [media] into <a> tag\r
 255                 $text = preg_replace("/(\[media\])([\s]*)(.*)(\[\/media\])/", '$1$3$4', $text);\r
 256                 $text = preg_replace("/(\[media\])(.*)([\s]*)(\[\/media\])/U", '$1$2$4', $text);\r
 257                 \r
 258                 $media_matches = array();\r
 259                 $media_replace = array();\r
 260                 \r
 261                 // First, we search though the text for all different kinds of media defined by media tags and store the results in $media_matches.\r
 262                 // Then the different replacements for the different media tags are stored in $media_replace.\r
 263                 // Lastly, we loop through all $media_matches / $media_replaces. (We choose $media_replace as index because $media_matches is multi-dimensioned.) It is important that for each $media_matches there is a $media_replace with the same index. For each media match we check the width/height, or we use the default value of 425x350. We then replace the height/width/media1/media2 parameter placeholders in $media_replace with the correct ones, before running a str_replace on $text, replacing the given media with its correct replacement.\r
 264         \r
 265                 // youtube videos\r
 266                 preg_match_all("#\[media[0-9a-z\|]*\]http://([a-z0-9\.]*)?youtube.com/watch\?v=(.*)\[/media\]#iU",$text,$media_matches[],PREG_SET_ORDER);\r
 267                 $media_replace[] = '<object width="##WIDTH##" height="##HEIGHT##"><param name="movie" value="http://##MEDIA1##youtube.com/v/##MEDIA2##"></param><embed src="http://##MEDIA1##youtube.com/v/##MEDIA2##" type="application/x-shockwave-flash" width="##WIDTH##" height="##HEIGHT##"></embed></object>';\r
 268                 \r
 269                 // .mpg\r
 270                 preg_match_all("#\[media[0-9a-z\|]*\]([.\w\d]+[^\s\"]+).mpg\[/media\]#i",$text,$media_matches[],PREG_SET_ORDER);\r
 271                 $media_replace[] = "<object data=\"##MEDIA1##.mpg\" type=\"video/mpeg\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.mpg\"><param name=\"autoplay\" value=\"false\"><param name=\"autoStart\" value=\"0\"><a href=\"##MEDIA1##.mpg\">##MEDIA1##.mpg</a></object>";\r
 272                 \r
 273                 // .avi\r
 274                 preg_match_all("#\[media[0-9a-z\|]*\]([.\w\d]+[^\s\"]+).avi\[/media\]#i",$text,$media_matches[],PREG_SET_ORDER);\r
 275                 $media_replace[] = "<object data=\"##MEDIA1##.avi\" type=\"video/x-msvideo\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.avi\"><param name=\"autoplay\" value=\"false\"><param name=\"autoStart\" value=\"0\"><a href=\"##MEDIA1##.avi\">##MEDIA1##.avi</a></object>";\r
 276                 \r
 277                 // .wmv\r
 278                 preg_match_all("#\[media[0-9a-z\|]*\]([.\w\d]+[^\s\"]+).wmv\[/media\]#i",$text,$media_matches[],PREG_SET_ORDER);\r
 279                 $media_replace[] = "<object data=\"##MEDIA1##.wmv\" type=\"video/x-ms-wmv\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.wmv\"><param name=\"autoplay\" value=\"false\"><param name=\"autoStart\" value=\"0\"><a href=\"##MEDIA1##.wmv\">##MEDIA1##.wmv</a></object>";\r
 280                 \r
 281                 // .mov\r
 282                 preg_match_all("#\[media[0-9a-z\|]*\]([.\w\d]+[^\s\"]+).mov\[/media\]#i",$text,$media_matches[],PREG_SET_ORDER);\r
 283                 $media_replace[] = "<object classid=\"clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B\" codebase=\"http://www.apple.com/qtactivex/qtplugin.cab\" width=\"##WIDTH##\" height=\"##HEIGHT##\">\n".\r
 284                                    "  <param name=\"src\" value=\"##MEDIA1##.mov\">\n".\r
 285                                    "  <param name=\"controller\" value=\"true\">\n".\r
 286                                    "  <param name=\"autoplay\" value=\"false\">\n".\r
 287                                    "  <!--[if gte IE 7] > <!-->\n".\r
 288                                    "  <object type=\"video/quicktime\" data=\"##MEDIA1##.mov\" width=\"##WIDTH##\" height=\"##HEIGHT##\">\n".\r
 289                                    "    <param name=\"controller\" value=\"true\">\n".\r
 290                                    "    <param name=\"autoplay\" value=\"false\">\n".\r
 291                                    "    <a href=\"##MEDIA1##.mov\">##MEDIA1##.mov</a>\n".\r
 292                                    "  </object>\n".\r
 293                                    "  <!--<![endif]-->\n".\r
 294                                    "  <!--[if lt IE 7]>\n".\r
 295                                    "  <a href=\"##MEDIA1##.mov\">##MEDIA1##.mov</a>\n".\r
 296                                    "  <![endif]-->\n".\r
 297                                    "</object>";\r
 298                 \r
 299                 // .swf\r
 300                 preg_match_all("#\[media[0-9a-z\|]*\]([.\w\d]+[^\s\"]+).swf\[/media\]#i",$text,$media_matches[],PREG_SET_ORDER);\r
 301                 $media_replace[] = "<object type=\"application/x-shockwave-flash\" data=\"##MEDIA1##.swf\" width=\"##WIDTH##\" height=\"##HEIGHT##\">  <param name=\"movie\" value=\"##MEDIA1##.swf\"><param name=\"loop\" value=\"false\"><a href=\"##MEDIA1##.swf\">##MEDIA1##.swf</a></object>";\r
 302         \r
 303                 // .mp3\r
 304                 preg_match_all("#\[media[0-9a-z\|]*\]([.\w\d]+[^\s\"]+).mp3\[/media\]#i",$text,$media_matches[],PREG_SET_ORDER);\r
 305                 $media_replace[] = "<object type=\"audio/mpeg\" data=\"##MEDIA1##.mp3\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.mp3\"><param name=\"autoplay\" value=\"false\"><param name=\"autoStart\" value=\"0\"><a href=\"##MEDIA1##.mp3\">##MEDIA1##.mp3</a></object>";\r
 306                 \r
 307                 // .wav\r
 308                 preg_match_all("#\[media[0-9a-z\|]*\](.+[^\s\"]+).wav\[/media\]#i",$text,$media_matches[],PREG_SET_ORDER);\r
 309                 $media_replace[] ="<object type=\"audio/x-wav\" data=\"##MEDIA1##.wav\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.wav\"><param name=\"autoplay\" value=\"false\"><param name=\"autoStart\" value=\"0\"><a href=\"##MEDIA1##.wav\">##MEDIA1##.wav</a></object>";\r
 310                 \r
 311                 // .ogg\r
 312                 preg_match_all("#\[media[0-9a-z\|]*\](.+[^\s\"]+).ogg\[/media\]#i",$text,$media_matches[],PREG_SET_ORDER);\r
 313                 $media_replace[] ="<object type=\"application/ogg\" data=\"##MEDIA1##.ogg\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.ogg\"><a href=\"##MEDIA1##.ogg\">##MEDIA1##.ogg</a></object>";\r
 314                 \r
 315                 // .ogm\r
 316                 preg_match_all("#\[media[0-9a-z\|]*\](.+[^\s\"]+).ogm\[/media\]#i",$text,$media_matches[],PREG_SET_ORDER);\r
 317                 $media_replace[] ="<object type=\"application/ogm\" data=\"##MEDIA1##.ogm\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.ogm\"><a href=\"##MEDIA1##.ogg\">##MEDIA1##.ogm</a></object>";\r
 318                 \r
 319                 // .mid\r
 320                 preg_match_all("#\[media[0-9a-z\|]*\](.+[^\s\"]+).mid\[/media\]#i",$text,$media_matches[],PREG_SET_ORDER);\r
 321                 $media_replace[] ="<object type=\"application/x-midi\" data=\"##MEDIA1##.mid\" width=\"##WIDTH##\" height=\"##HEIGHT##\"><param name=\"src\" value=\"##MEDIA1##.mid\"><a href=\"##MEDIA1##.mid\">##MEDIA1##.mid</a></object>";\r
 322                 \r
 323                 $text = preg_replace("#\[media[0-9a-z\|]*\](.+[^\s\"]+).mid\[/media\]#i", "<object type=\"application/x-midi\" data=\"\\1.mid\" width=\"".$width."\" height=\"".$height."\"><param name=\"src\" value=\"\\1.mid\"><a href=\"\\1.mid\">\\1.mid</a></object>", $text);\r
 324         \r
 325                 // Executing the replace\r
 326                 for ($i=0;$i<count($media_replace);$i++){\r
 327                         foreach($media_matches[$i] as $media)\r
 328                         {\r
 329                                 \r
 330                                 //find width and height for each matched media\r
 331                                 if (preg_match("/\[media\|([0-9]*)\|([0-9]*)\]*/", $media[0], $matches)) \r
 332                                 {\r
 333                                         $width = $matches[1];\r
 334                                         $height = $matches[2];\r
 335                                 }\r
 336                                 else\r
 337                                 {\r
 338                                         $width = 425;\r
 339                                         $height = 350;\r
 340                                 }\r
 341                                 \r
 342                                 //replace media tags with embedded media for each media tag\r
 343                                 $media_input = $media_replace[$i];\r
 344                                 $media_input = str_replace("##WIDTH##","$width",$media_input);\r
 345                                 $media_input = str_replace("##HEIGHT##","$height",$media_input);\r
 346                                 $media_input = str_replace("##MEDIA1##","$media[1]",$media_input);\r
 347                                 $media_input = str_replace("##MEDIA2##","$media[2]",$media_input);\r
 348                                 $text = str_replace($media[0],$media_input,$text);\r
 349                         }\r
 350                 }\r
 351                 \r
 352                 return $text;\r
 353         }\r
 354 \r
 355         public static function makeClickable($text) {\r
 356                 $text = ContentUtility::embedMedia($text);\r
 357         \r
 358                 // convert plain text URL to clickable URL.\r
 359                 // Limited conversion: It doesn't cover the case when the stuff in front of the URL is not a word. For example:\r
 360                 // <p>http://google.ca</p>\r
 361                 // "http://google.ca" \r
 362                 $text = preg_replace('/(^|[\n ])([\w]*?)((?<!(\[media\]))http(s)?:\/\/[\w]+[^ \,\"\n\r\t\)<]*)/is', \r
 363                                      '$1$2<a href="$3">$3</a>', $text);\r
 364                 \r
 365                 // convert email address to clickable URL that pops up "send email" interface with the address filled in\r
 366                 $text = preg_replace('/(?|<a href="mailto[\s]*:[\s]*([_a-zA-Z0-9\-]+(\.[_a-zA-Z0-9\-]+)*'.'\@'\r
 367                                     .'[_a-zA-Z0-9\-]+(\.[_a-zA-Z0-9\-]+)*'.'(\.[a-zA-Z]{1,6})+)">(.*)<\/a>'\r
 368                                     .'|((((([_a-zA-Z0-9\-]+(\.[_a-zA-Z0-9\-]+)*'.'\@'\r
 369                                     .'[_a-zA-Z0-9\-]+(\.[_a-zA-Z0-9\-]+)*'.'(\.[a-zA-Z]{1,6})+))))))/i',\r
 370                                                         "<a href=\"mailto:\\1\">\\5</a>",\r
 371                                                         $text);\r
 372                 \r
 373                 // flv conversion needs to come after url conversion (2 lines above) otherwise the url to flowplayer swf file\r
 374                 // in the script for a.flowplayerholder is converted\r
 375                 $text = ContentUtility::embedFLV($text);\r
 376                 \r
 377                 return $text;\r
 378         }\r
 379 \r
 380         public static function myCodes($text, $html = false) {\r
 381                 global $_base_path;\r
 382                 global $HTTP_USER_AGENT;\r
 383         \r
 384                 if (substr($HTTP_USER_AGENT,0,11) == 'Mozilla/4.7') {\r
 385                         $text = str_replace('[quote]','</p><p class="block">',$text);\r
 386                         $text = str_replace('[/quote]','</p><p>',$text);\r
 387         \r
 388                         $text = str_replace('[reply]','</p><p class="block">',$text);\r
 389                         $text = str_replace('[/reply]','</p><p>',$text);\r
 390                 } else {\r
 391                         $text = str_replace('[quote]','<blockquote>',$text);\r
 392                         $text = str_replace('[/quote]','</blockquote><p>',$text);\r
 393         \r
 394                         $text = str_replace('[reply]','</p><blockquote class="block"><p>',$text);\r
 395                         $text = str_replace('[/reply]','</p></blockquote><p>',$text);\r
 396                 }\r
 397         \r
 398                 $text = str_replace('[b]','<strong>',$text);\r
 399                 $text = str_replace('[/b]','</strong>',$text);\r
 400         \r
 401                 $text = str_replace('[i]','<em>',$text);\r
 402                 $text = str_replace('[/i]','</em>',$text);\r
 403         \r
 404                 $text = str_replace('[u]','<u>',$text);\r
 405                 $text = str_replace('[/u]','</u>',$text);\r
 406         \r
 407                 $text = str_replace('[center]','<center>',$text);\r
 408                 $text = str_replace('[/center]','</center><p>',$text);\r
 409         \r
 410                 /* colours */\r
 411                 $text = str_replace('[blue]','<span style="color: blue;">',$text);\r
 412                 $text = str_replace('[/blue]','</span>',$text);\r
 413         \r
 414                 $text = str_replace('[orange]','<span style="color: orange;">',$text);\r
 415                 $text = str_replace('[/orange]','</span>',$text);\r
 416         \r
 417                 $text = str_replace('[red]','<span style="color: red;">',$text);\r
 418                 $text = str_replace('[/red]','</span>',$text);\r
 419         \r
 420                 $text = str_replace('[purple]','<span style="color: purple;">',$text);\r
 421                 $text = str_replace('[/purple]','</span>',$text);\r
 422         \r
 423                 $text = str_replace('[green]','<span style="color: green;">',$text);\r
 424                 $text = str_replace('[/green]','</span>',$text);\r
 425         \r
 426                 $text = str_replace('[gray]','<span style="color: gray;">',$text);\r
 427                 $text = str_replace('[/gray]','</span>',$text);\r
 428         \r
 429                 $text = str_replace('[op]','<span class="bigspacer"></span> <a href="',$text);\r
 430                 $text = str_replace('[/op]','">'._AT('view_entire_post').'</a>',$text);\r
 431         \r
 432                 $text = str_replace('[head1]','<h2>',$text);\r
 433                 $text = str_replace('[/head1]','</h2>',$text);\r
 434         \r
 435                 $text = str_replace('[head2]','<h3>',$text);\r
 436                 $text = str_replace('[/head2]','</h3>',$text);\r
 437         \r
 438                 $text = str_replace('[cid]',$_base_path.'content.php?_cid='.$_SESSION['s_cid'],$text);\r
 439         \r
 440                 global $sequence_links, $_course_id, $_content_id;\r
 441                 if ($_course_id > 0 && !isset($sequence_links) && $_content_id > 0) {\r
 442                         global $contentManager;\r
 443                         $sequence_links = $contentManager->generateSequenceCrumbs($_content_id);\r
 444                 }\r
 445                 if (isset($sequence_links['previous']) && $sequence_links['previous']['url']) {\r
 446                         $text = str_replace('[pid]', $sequence_links['previous']['url'], $text);\r
 447                 }\r
 448                 if (isset($sequence_links['next']) && $sequence_links['next']['url']) {\r
 449                         $text = str_replace('[nid]', $sequence_links['next']['url'], $text);\r
 450                 }\r
 451                 if (isset($sequence_links['resume']) && $sequence_links['resume']['url']) {\r
 452                         $text = str_replace('[nid]', $sequence_links['resume']['url'], $text);\r
 453                 }\r
 454                 if (isset($sequence_links['first']) && $sequence_links['first']['url']) {\r
 455                         $text = str_replace('[fid]', $sequence_links['first']['url'], $text);\r
 456                 }\r
 457         \r
 458                 /* contributed by Thomas M. Duffey <tduffey at homeboyz.com> */\r
 459             $html = !$html ? 0 : 1;\r
 460             \r
 461                 // little hack added by greg to add syntax highlighting without using <?php \?\>\r
 462                 \r
 463                 $text = str_replace("[code]","[code]<?php",$text);\r
 464                 $text = str_replace("[/code]","?>[/code]",$text);\r
 465         \r
 466                 $text = preg_replace("/\[code\]\s*(.*)\s*\[\\/code\]/Usei", "ContentUtility::highlightCode(ContentUtility::fixQuotes('\\1'), $html)", $text);\r
 467                 // now remove the <?php added above and leave the syntax colour behind.\r
 468                 $text = str_replace("&lt;?php", "", $text);\r
 469                 $text = str_replace("?&gt;", "", $text);\r
 470         \r
 471                 return $text;\r
 472         }\r
 473 \r
 474         /* contributed by Thomas M. Duffey <tduffey at homeboyz.com> */\r
 475         private static function highlightCode($code, $html) {\r
 476                 // XHTMLize PHP highlight_string output until it gets fixed in PHP\r
 477                 static $search = array(\r
 478                         '<br>',\r
 479                         '<font',\r
 480                         '</font>',\r
 481                         'color="');\r
 482         \r
 483                 static $replace = array(\r
 484                         '<br />',\r
 485                         '<span',\r
 486                         '</span>',\r
 487                         'style="color:');\r
 488                 if (!$html) {\r
 489                         $code = str_replace('&lt;', '<', $code);\r
 490                         $code = str_replace("\r", '', $code);\r
 491                 }\r
 492         \r
 493                 return str_replace($search, $replace, highlight_string($code, true));\r
 494         }\r
 495         \r
 496         /* contributed by Thomas M. Duffey <tduffey at homeboyz.com> */\r
 497         private static function fixQuotes($text){\r
 498                 return str_replace('\\"', '"', $text);\r
 499         }\r
 500 \r
 501         public static function imageReplace($text) {\r
 502                 /* image urls do not require http:// */\r
 503                 \r
 504         //      $text = eregi_replace("\[image(\|)?([[:alnum:][:space:]]*)\]" .\r
 505         //                                               "[:space:]*" .\r
 506         //                                               "([[:alnum:]#?/&=:\"'_.-]+)" .\r
 507         //                                               "[:space:]*" .\r
 508         //                                               "((\[/image\])|(.*\[/image\]))",\r
 509         //                                "<img src=\"\\3\" alt=\"\\2\" />",\r
 510         //                                $text);\r
 511                  \r
 512                 $text = preg_replace("/\[image(\|)?([a-zA-Z0-9\s]*)\]".\r
 513                                      "[\s]*".\r
 514                                      "([a-zA-Z0-9\#\?\/\&\=\:\\\"\'\_\.\-]+)[\s]*".\r
 515                                      "((\[\/image\])|(.*\[\/image\]))/i",\r
 516                                           "<img src=\"\\3\" alt=\"\\2\" />",\r
 517                                           $text);\r
 518                                           \r
 519                 return $text;\r
 520         }\r
 521         \r
 522         private static function formatFinalOutput($text, $nl2br = true) {\r
 523                 global $_base_path;\r
 524         \r
 525                 $text = str_replace('CONTENT_DIR/', '', $text);\r
 526                 if ($nl2br) {\r
 527                         return nl2br(ContentUtility::imageReplace(ContentUtility::makeClickable(ContentUtility::myCodes(' '.$text, false))));\r
 528                 }\r
 529         \r
 530                 return ContentUtility::imageReplace(ContentUtility::makeClickable(ContentUtility::myCodes(' '.$text, true)));\r
 531         }\r
 532 \r
 533         /**\r
 534         * This function converts the input string into AContent html content string \r
 535         * @access  public\r
 536         * @param   $input: input string\r
 537         *          $html: whether the input is in html\r
 538         * @return  converted AContent html content string\r
 539         * @author  Cindy Qi Li\r
 540         */\r
 541         public static function formatContent($input, $html = 0) {\r
 542                 global $_base_path, $_config;\r
 543         \r
 544                 if (!$html) {\r
 545                         $input = str_replace('<', '&lt;', $input);\r
 546                         $input = str_replace('&lt;?php', '<?php', $input); // for bug #2087\r
 547                 } elseif ($html==2) {\r
 548                         $output = '<iframe width="100%" frameborder="0" id="content_frame" marginheight="0" marginwidth="0" src="'.$input.'"></iframe>';\r
 549                         $output .=      '<script type="text/javascript">\r
 550                                                 function resizeIframe() {\r
 551                                                         var height = document.documentElement.clientHeight;\r
 552                                                         \r
 553                                                         // not sure how to get this dynamically\r
 554                                                         height -= 20; /* whatever you set your body bottom margin/padding to be */\r
 555                                                         \r
 556                                                         document.getElementById(\'content_frame\').style.height = height +"px";\r
 557                                                         \r
 558                                                 };\r
 559                                                 document.getElementById(\'content_frame\').onload = resizeIframe;\r
 560                                                 window.onresize = resizeIframe;\r
 561                                                 </script>';\r
 562                         return $output;\r
 563                 }\r
 564         \r
 565                 /* Commented by Cindy Qi Li on Jan 12, 2010\r
 566                  * AContent does not support glossary\r
 567                 // do the glossary search and replace:\r
 568                 if (is_array($glossary)) {\r
 569                         foreach ($glossary as $k => $v) {\r
 570                                 $k = urldecode($k);\r
 571                                 $v = str_replace("\n", '<br />', $v);\r
 572                                 $v = str_replace("\r", '', $v);\r
 573         \r
 574                                 // escape special characters\r
 575                                 $k = preg_quote($k);\r
 576         \r
 577                                 $k = str_replace('&lt;', '<', $k);\r
 578                                 $k = str_replace('/', '\/', $k);\r
 579         \r
 580                                 $original_term = $k;\r
 581                                 $term = $original_term;\r
 582         \r
 583                                 $term = '(\s*'.$term.'\s*)';\r
 584                                 $term = str_replace(' ','((<br \/>)*\s*)', $term); \r
 585         \r
 586                                 $def = htmlspecialchars($v, ENT_QUOTES, 'UTF-8');               \r
 587                                 if ($simple) {\r
 588                                         $input = preg_replace\r
 589                                                         ("/(\[\?\])$term(\[\/\?\])/i",\r
 590                                                         '<a href="'.$simple.'glossary.html#'.urlencode($original_term).'" target="body" class="at-term">\\2</a>',\r
 591                                                         $input);\r
 592                                 } else {\r
 593                                         $input = preg_replace\r
 594                                                 ("/(\[\?\])$term(\[\/\?\])/i",\r
 595                                                 '\\2<sup><a class="tooltip" href="'.$_base_path.'mods/_core/glossary/index.php?g_cid='.$_SESSION['s_cid'].htmlentities(SEP).'w='.urlencode($original_term).'#term" title="'.addslashes($original_term).': '.$def.'">?</a></sup>',$input);\r
 596                                 }\r
 597                         }\r
 598                 } else if (!$user_glossary) {\r
 599                         $input = str_replace(array('[?]','[/?]'), '', $input);\r
 600                 }\r
 601                 */\r
 602 \r
 603                 \r
 604                 $input = str_replace('CONTENT_DIR', '', $input);\r
 605         \r
 606                 if (isset($_config['latex_server']) && $_config['latex_server']) {\r
 607                         // see: http://www.forkosh.com/mimetex.html\r
 608                         $input = preg_replace('/\[tex\](.*?)\[\/tex\]/sie', "'<img src=\"'.\$_config['latex_server'].rawurlencode('$1').'\" align=\"middle\">'", $input);\r
 609                 }\r
 610         \r
 611                 if ($html) {\r
 612                         $x = ContentUtility::formatFinalOutput($input, false);\r
 613                         return $x;\r
 614                 }\r
 615         \r
 616                 $output = ContentUtility::formatFinalOutput($input);\r
 617         \r
 618                 $output = '<p>'.$input.'</p>';\r
 619         \r
 620                 return $output;\r
 621         }\r
 622         \r
 623         /**\r
 624          * This function returns html string of "table of content"\r
 625          * @access: public\r
 626          * @param: $content: a string\r
 627          * @return: a html string of "table of content"\r
 628          */\r
 629         public static function getContentTable($content)\r
 630         {\r
 631                 preg_match_all("/<(h[\d]+)[^>]*>(.*)<\/(\s*)\\1(\s*)>/i", $content, $found_headers, PREG_SET_ORDER);\r
 632                 \r
 633                 if (count($found_headers) == 0) return array("", $content);\r
 634                 else\r
 635                 {\r
 636                         $num_of_headers = 0;\r
 637         \r
 638                         for ($i = 0; $i < count($found_headers); $i++)\r
 639                         {\r
 640                                 $div_id = "_header_" . $num_of_headers++;\r
 641                                 \r
 642                                 if ($i == 0)\r
 643                                 {\r
 644                                         $content_table = "<div id=\"toc\">\n<fieldset id=\"toc\"><legend>". _AT("table_of_contents")."</legend>\n";\r
 645                                 }\r
 646         \r
 647                                 $content = str_replace($found_headers[$i][0], '<div id="'.$div_id.'">'.$found_headers[$i][0].'</div>', $content);\r
 648                                 $content_table .= '<a href="'.$_SERVER["REQUEST_URI"].'#'.$div_id.'" class="'.$found_headers[$i][1].'">'. $found_headers[$i][2]."</a>\n";\r
 649         \r
 650                                 if ($i == count($found_headers) - 1)\r
 651                                 {\r
 652                                         $content_table .= "</fieldset></div><br />";\r
 653                                 }\r
 654                         }\r
 655                         return array($content_table, $content);\r
 656                 }\r
 657         }\r
 658         \r
 659         /**\r
 660          * This function returns an array of content tools' shortcuts\r
 661          * @access: public\r
 662          * @param: $content_row: an array of the current content information\r
 663          * @return: an array of all the tool short cuts that apply to the current content or content folder\r
 664          */\r
 665         public static function getToolShortcuts($content_row)\r
 666         {\r
 667                 global $_current_user, $_base_href, $contentManager, $_course_id;\r
 668                 \r
 669                 if (((!$content_row['content_parent_id'] && ($_SESSION['packaging'] == 'top'))\r
 670                       || ($_SESSION['packaging'] == 'all'))\r
 671                           || (isset($_current_user) && $_current_user->isAuthor($_course_id))) {\r
 672                 \r
 673                         $tool_shortcuts[] = array(\r
 674                                   'title' => _AT('export_content_in_cp'), \r
 675                                   'url' => $_base_href . 'home/ims/ims_export.php?_cid='.$content_row['content_id'],\r
 676                                   'icon' => $_base_href . 'themes/'.$_SESSION['prefs']['PREF_THEME'].'/images/export.png');\r
 677                         $tool_shortcuts[] = array(\r
 678                                   'title' => _AT('export_content_in_cc'), \r
 679                                   'url' => $_base_href . 'home/imscc/ims_export.php?_cid='.$content_row['content_id'].SEP.'to_a4a=1',\r
 680                                   'icon' => $_base_href . 'themes/'.$_SESSION['prefs']['PREF_THEME'].'/images/export_cc.png');\r
 681                 }\r
 682                 \r
 683                 if (isset($_current_user) && $_current_user->isAuthor($_course_id)) {\r
 684                         if ($content_row['content_type'] == CONTENT_TYPE_CONTENT || $content_row['content_type'] == CONTENT_TYPE_WEBLINK) {\r
 685                                 $tool_shortcuts[] = array(\r
 686                                           'title' => _AT('edit_this_page'),   \r
 687                                            'url' => $_base_href . 'home/editor/edit_content.php?_cid='.$content_row['content_id'],\r
 688                                           'icon' => $_base_href . 'images/medit.gif');\r
 689                         }\r
 690                 \r
 691                         $tool_shortcuts[] = array(\r
 692                           'title' => _AT('add_sibling_folder'), \r
 693                           'url' => $_base_href .\r
 694                                 'home/editor/edit_content_folder.php?pid='.$contentManager->_menu_info[$content_row['content_id']]['content_parent_id'].SEP.'_course_id='.$_course_id,\r
 695                            'icon' => $_base_href . 'images/add_sibling_folder.gif');\r
 696 \r
 697                         if ($content_row['content_type'] == CONTENT_TYPE_FOLDER || $content_row['content_type'] == CONTENT_TYPE_WEBLINK) {\r
 698                                 $tool_shortcuts[] = array(\r
 699                                   'title' => _AT('add_sub_folder'), \r
 700                                   'url' => $_base_href .\r
 701                                         'home/editor/edit_content_folder.php?_course_id='.$_course_id.SEP.'pid='.$content_row['content_id'],\r
 702                                    'icon' => $_base_href . 'images/add_sub_folder.gif');\r
 703                         }\r
 704                         \r
 705                         $tool_shortcuts[] = array(\r
 706                           'title' => _AT('add_sibling_page'), \r
 707                           'url' => $_base_href .\r
 708                                 'home/editor/edit_content.php?pid='.$contentManager->_menu_info[$content_row['content_id']]['content_parent_id'].SEP.'_course_id='.$_course_id,\r
 709                           'icon' => $_base_href . 'images/add_sibling_page.gif');\r
 710                         \r
 711                         if ($content_row['content_type'] == CONTENT_TYPE_CONTENT || $content_row['content_type'] == CONTENT_TYPE_WEBLINK) {\r
 712                                 $tool_shortcuts[] = array(\r
 713                                   'title' => _AT('delete_this_page'),   \r
 714                                   'url' => $_base_href . 'home/editor/delete_content.php?_cid='.$content_row['content_id'],\r
 715                                   'icon' => $_base_href . 'images/page_delete.gif');\r
 716                         }\r
 717                         else if ($content_row['content_type'] == CONTENT_TYPE_FOLDER) {\r
 718                                 $tool_shortcuts[] = array(\r
 719                                   'title' => _AT('add_sub_page'),       \r
 720                                   'url' => $_base_href . 'home/editor/edit_content.php?_course_id='.$_course_id.SEP.'pid='.$content_row['content_id'],\r
 721                                   'icon' => $_base_href . 'images/add_sub_page.gif');\r
 722                                 \r
 723                                 $tool_shortcuts[] = array(\r
 724                                   'title' => _AT('delete_this_folder'),         \r
 725                                   'url' => $_base_href . 'home/editor/delete_content.php?_cid='.$content_row['content_id'],\r
 726                                   'icon' => $_base_href . 'images/page_delete.gif');\r
 727                         }\r
 728                 }\r
 729                 return $tool_shortcuts;\r
 730 \r
 731 //      if (isset($_current_user) && $_current_user->isAuthor($_course_id)) {\r
 732 //              $shortcuts[] = array('title' => _AT('add_sub_folder'),   'url' => $_base_href . 'home/editor/edit_content_folder.php?_course_id='.$_course_id.'pid='.$cid);\r
 733 //              \r
 734 ////            $shortcuts[] = array('title' => _AT('add_top_page'),     'url' => $_base_href . 'home/editor/edit_content.php?_course_id='.$_course_id, 'icon' => $_base_href . 'images/page_add.gif');\r
 735 //              if ($contentManager->_menu_info[$cid]['content_parent_id']) {\r
 736 //                      $shortcuts[] = array('title' => _AT('add_sibling_page'), 'url' => $_base_href .\r
 737 //                              'home/editor/edit_content.php?_course_id='.$_course_id.SEP.'pid='.$contentManager->_menu_info[$cid]['content_parent_id'], 'icon' => $_base_href . 'images/page_add_sibling.gif');\r
 738 //              }\r
 739 //      \r
 740 //              $shortcuts[] = array('title' => _AT('add_sub_page'),     'url' => $_base_href . 'home/editor/edit_content.php?_course_id='.$_course_id.SEP.'pid='.$cid);\r
 741 //              $shortcuts[] = array('title' => _AT('delete_this_folder'), 'url' => $_base_href . 'home/editor/delete_content.php?_cid='.$cid, 'icon' => $_base_href . 'images/page_delete.gif');\r
 742 //      }\r
 743         }\r
 744         \r
 745         /**\r
 746         * replace source object with alternatives according to user's preferences\r
 747         * @access       public\r
 748         * @param        $cid:                           content id.\r
 749         * @param        $content:                       the original content page ($content_row['text'], from content.php).\r
 750         * @param    $info_only:         when "true", return the array of info (has_text_alternative, has_audio_alternative, has_visual_alternative, has_sign_lang_alternative)\r
 751         * @param    $only_on_secondary_type: \r
 752         * @return       string                          $content: the content page with the appropriated resources.\r
 753         * @see          $db                             from include/vitals.inc.php\r
 754         * @author       Cindy Qi Li\r
 755         */\r
 756         public static function applyAlternatives($cid, $content, $info_only = false, $only_on_secondary_type = 0){\r
 757                 global $db, $_course_id;\r
 758                 \r
 759                 include_once(TR_INCLUDE_PATH.'classes/DAO/DAO.class.php');\r
 760                 $dao = new DAO();\r
 761                 \r
 762         $video_exts = array("mpg", "avi", "wmv", "mov", "swf", "mp4", "flv");\r
 763         \r
 764         $audio_exts = array("mp3", "wav", "ogg", "mid");\r
 765         $audio_width = 425;\r
 766         $audio_height = 27;\r
 767 \r
 768                 $txt_exts = array("txt", "html", "htm");\r
 769                 $image_exts = array("gif", "bmp", "png", "jpg", "jpeg", "png", "tif");\r
 770                 $only_on_secondary_type = intval($only_on_secondary_type);\r
 771                                 \r
 772                 // intialize the 4 returned values when $info_only is on\r
 773                 if ($info_only)\r
 774                 {\r
 775                         $has_text_alternative = false;\r
 776                         $has_audio_alternative = false;\r
 777                         $has_visual_alternative = false;\r
 778                         $has_sign_lang_alternative = false;\r
 779                 }\r
 780 \r
 781                 if (!$info_only && !$only_on_secondary_type && \r
 782                     ($_SESSION['prefs']['PREF_USE_ALTERNATIVE_TO_TEXT']==0) && \r
 783                     ($_SESSION['prefs']['PREF_USE_ALTERNATIVE_TO_AUDIO']==0) && \r
 784                     ($_SESSION['prefs']['PREF_USE_ALTERNATIVE_TO_VISUAL']==0)) \r
 785                 {\r
 786                         //No user's preferences related to content format are declared\r
 787                         if (!$info_only) {\r
 788                                 return $content;\r
 789                         } else {\r
 790                                 return array($has_text_alternative, $has_audio_alternative, $has_visual_alternative, $has_sign_lang_alternative);\r
 791                         }\r
 792                 }\r
 793         \r
 794                 // get all relations between primary resources and their alternatives\r
 795         $sql = "SELECT DISTINCT c.content_path, pr.resource, ";\r
 796         \r
 797         // ignore primary resource type if the request is on particular secondary type.\r
 798         // otherwise, if the primary resource is defined with multiple primary types, \r
 799         // the primary resource would be replaced/appended multiple times.\r
 800         if ($only_on_secondary_type == 0) {\r
 801             $sql .= "prt.type_id primary_type, ";\r
 802         }\r
 803         $sql .= "sr.secondary_resource, srt.type_id secondary_type\r
 804                           FROM ".TABLE_PREFIX."primary_resources pr, ".\r
 805                                  TABLE_PREFIX."primary_resources_types prt,".\r
 806                                  TABLE_PREFIX."secondary_resources sr,".\r
 807                                  TABLE_PREFIX."secondary_resources_types srt,".\r
 808                                  TABLE_PREFIX."content c\r
 809                          WHERE pr.content_id=".$cid."\r
 810                                AND pr.primary_resource_id = prt.primary_resource_id\r
 811                                AND pr.primary_resource_id = sr.primary_resource_id\r
 812                                AND sr.language_code='".$_SESSION['lang']."'\r
 813                                AND sr.secondary_resource_id = srt.secondary_resource_id\r
 814                            AND pr.content_id = c.content_id";\r
 815                 if ($only_on_secondary_type > 0) {\r
 816                         $sql .= " AND srt.type_id=".$only_on_secondary_type;\r
 817                 }\r
 818                 $sql .= " ORDER BY pr.primary_resource_id, prt.type_id";\r
 819                         \r
 820                 $rows = $dao->execute($sql);\r
 821         \r
 822                 if (!is_array($rows)) {\r
 823                         if (!$info_only) {\r
 824                                 return $content;\r
 825                         } else {\r
 826                                 return array($has_text_alternative, $has_audio_alternative, $has_visual_alternative, $has_sign_lang_alternative);\r
 827                         }\r
 828                 }\r
 829                 \r
 830                 foreach ($rows as $row) {\r
 831             $alternative_rows[] = $row;\r
 832             \r
 833             $youtube_playURL = ContentUtility::convertYoutubeWatchURLToPlayURL($row['resource']);\r
 834             \r
 835             if ($row['resource'] <> $youtube_playURL) {\r
 836                 $row['resource'] = $youtube_playURL;\r
 837                 $alternative_rows[] = $row;\r
 838             }\r
 839         }\r
 840 \r
 841         foreach ($alternative_rows as $row) \r
 842                 {\r
 843                         if ($info_only || $only_on_secondary_type ||\r
 844                             ($_SESSION['prefs']['PREF_USE_ALTERNATIVE_TO_TEXT']==1 && $row['primary_type']==3 &&\r
 845                             ($_SESSION['prefs']['PREF_ALT_TO_TEXT']=="audio" && $row['secondary_type']==1 || \r
 846                              $_SESSION['prefs']['PREF_ALT_TO_TEXT']=="visual" && $row['secondary_type']==4 || \r
 847                              $_SESSION['prefs']['PREF_ALT_TO_TEXT']=="sign_lang" && $row['secondary_type']==2)) ||\r
 848                              \r
 849                              ($_SESSION['prefs']['PREF_USE_ALTERNATIVE_TO_AUDIO']==1 && $row['primary_type']==1 &&\r
 850                              ($_SESSION['prefs']['PREF_ALT_TO_AUDIO']=="visual" && $row['secondary_type']==4 || \r
 851                               $_SESSION['prefs']['PREF_ALT_TO_AUDIO']=="text" && $row['secondary_type']==3 || \r
 852                               $_SESSION['prefs']['PREF_ALT_TO_AUDIO']=="sign_lang" && $row['secondary_type']==2)) ||\r
 853                               \r
 854                              ($_SESSION['prefs']['PREF_USE_ALTERNATIVE_TO_VISUAL']==1 && $row['primary_type']==4 &&\r
 855                              ($_SESSION['prefs']['PREF_ALT_TO_VISUAL']=="audio" && $row['secondary_type']==1 || \r
 856                               $_SESSION['prefs']['PREF_ALT_TO_VISUAL']=="text" && $row['secondary_type']==3 || \r
 857                               $_SESSION['prefs']['PREF_ALT_TO_VISUAL']=="sign_lang" && $row['secondary_type']==2))\r
 858                             )\r
 859                         {\r
 860                                 $ext = substr($row['secondary_resource'], strrpos($row['secondary_resource'], '.')+1);\r
 861                                 \r
 862                                 // alternative is video\r
 863                                 if (in_array($ext, $video_exts)|| in_array($ext, $audio_exts) || \r
 864                     preg_match("/http:\/\/.*youtube.com\/watch.*/", $row['secondary_resource'])) {\r
 865                     if (in_array($ext, $audio_exts)) {\r
 866                         // display audio medias in a smaller width/height (425 * 27)\r
 867                         // A hack for now to handle audio media player size\r
 868                         $target = '[media|'.$audio_width.'|'.$audio_height.']'.$row['secondary_resource'].'[/media]';\r
 869                     } else {\r
 870                         // use default media size for video medias\r
 871                         $target = '[media]'.$row['secondary_resource'].'[/media]';\r
 872                     }\r
 873                 }\r
 874                                 // a text primary to be replaced by a visual alternative \r
 875                                 else if (in_array($ext, $txt_exts))\r
 876                                 {\r
 877                                         if ($row['content_path'] <> '') \r
 878                                                 $file_location = $row['content_path'].'/'.$row['secondary_resource'];\r
 879                                         else \r
 880                                                 $file_location = $row['secondary_resource'];\r
 881                                         \r
 882                                         $file = TR_CONTENT_DIR.$_SESSION['course_id'] . '/'.$file_location;\r
 883                                         $target = '<br />'.file_get_contents($file);\r
 884                                         \r
 885                                         // check whether html file\r
 886                                         if (preg_match('/.*\<html.*\<\/html\>.*/s', $target))\r
 887                                         { // is a html file, use iframe to display\r
 888                                                 // get real path to the text file\r
 889                                                 if (defined('TR_FORCE_GET_FILE') && TR_FORCE_GET_FILE) {\r
 890                                                         $course_base_href = 'get.php/';\r
 891                                                 } else {\r
 892                                                         $course_base_href = 'content/' . $_SESSION['course_id'] . '/';\r
 893                                                 }\r
 894                 \r
 895                                                 $file = TR_BASE_HREF . $course_base_href.$file_location;\r
 896                                                         \r
 897                                                 $target = '<iframe width="100%" frameborder="0" class="autoHeight" scrolling="auto" src="'.$file.'"></iframe>';\r
 898                                         }\r
 899                                         else\r
 900                                         { // is a text file, insert/replace into content\r
 901                                                 $target = nl2br($target);\r
 902                                         }\r
 903                                 } \r
 904                                 else if (in_array($ext, $image_exts))\r
 905                                         $target = '<img border="0" alt="'._AT('alternate_text').'" src="'.$row['secondary_resource'].'"/>';\r
 906                                 // otherwise\r
 907                                 else\r
 908                                         $target = '<p><a href="'.$row['secondary_resource'].'">'.$row['secondary_resource'].'</a></p>';\r
 909         \r
 910                                 // replace or append the target alternative to the source\r
 911                                 if (($row['primary_type']==3 && $_SESSION['prefs']['PREF_ALT_TO_TEXT_APPEND_OR_REPLACE'] == 'replace') ||\r
 912                                         ($row['primary_type']==1 && $_SESSION['prefs']['PREF_ALT_TO_AUDIO_APPEND_OR_REPLACE']=='replace') ||\r
 913                                         ($row['primary_type']==4 && $_SESSION['prefs']['PREF_ALT_TO_VISUAL_APPEND_OR_REPLACE']=='replace'))\r
 914                                         $pattern_replace_to = '${1}'."\n".$target."\n".'${3}';\r
 915                 else\r
 916                     $pattern_replace_to = '${1}${2}'."<br /><br />\n".$target."\n".'${3}';\r
 917 \r
 918                 // *** Alternative replace/append starts from here ***\r
 919                 $processed = false;    // one primary resource is only processed once \r
 920                 \r
 921                 // append/replace target alternative to [media]source[/media]\r
 922                 if (!$processed && preg_match("/".preg_quote("[media").".*".preg_quote("]".$row['resource']."[/media]", "/")."/sU", $content))\r
 923                 {\r
 924                     $processed = true;\r
 925                                         if (!$info_only) {\r
 926                                                 $content = preg_replace("/(.*)(".preg_quote("[media").".*".preg_quote("]".$row['resource']."[/media]", "/").")(.*)/sU", \r
 927                                              $pattern_replace_to, $content);\r
 928                                         } else {\r
 929                                                 if ($row['secondary_type'] == 1) $has_audio_alternative = true;\r
 930                                                 if ($row['secondary_type'] == 2) $has_sign_lang_alternative = true;\r
 931                                                 if ($row['secondary_type'] == 3) $has_text_alternative = true;\r
 932                                                 if ($row['secondary_type'] == 4) $has_visual_alternative = true;\r
 933                                         }\r
 934                                 }\r
 935                                 \r
 936                                 // append/replace target alternative to <img ... src="source" ...></a>\r
 937                                 if (!$processed && preg_match("/\<img.*src=\"".preg_quote($row['resource'], "/")."\".*\/\>/sU", $content))\r
 938                 {\r
 939                     $processed = true;\r
 940                                         if (!$info_only) {\r
 941                                                 $content = preg_replace("/(.*)(\<img.*src=\"".preg_quote($row['resource'], "/")."\".*\/\>)(.*)/sU", \r
 942                                                         $pattern_replace_to, $content);\r
 943                                         } else {\r
 944                                                 if ($row['secondary_type'] == 1) $has_audio_alternative = true;\r
 945                                                 if ($row['secondary_type'] == 2) $has_sign_lang_alternative = true;\r
 946                                                 if ($row['secondary_type'] == 3) $has_text_alternative = true;\r
 947                                                 if ($row['secondary_type'] == 4) $has_visual_alternative = true;\r
 948                                         }\r
 949                                 }\r
 950                                 \r
 951                                 // append/replace target alternative to <object ... source ...></object>\r
 952                 if (!$processed && preg_match("/\<object.*".preg_quote($row['resource'], "/").".*\<\/object\>/sU", $content))\r
 953                 {\r
 954                     $processed = true;\r
 955                     if (!$info_only) {\r
 956                         $content = preg_replace("/(.*)(\<object.*".preg_quote($row['resource'], "/").".*\<\/object\>)(.*)/sU", \r
 957                                                         $pattern_replace_to, $content);\r
 958                                         } else {\r
 959                                                 if ($row['secondary_type'] == 1) $has_audio_alternative = true;\r
 960                                                 if ($row['secondary_type'] == 2) $has_sign_lang_alternative = true;\r
 961                                                 if ($row['secondary_type'] == 3) $has_text_alternative = true;\r
 962                                                 if ($row['secondary_type'] == 4) $has_visual_alternative = true;\r
 963                                         }\r
 964                                 }\r
 965         \r
 966                                 // append/replace target alternative to <a>...source...</a> or <a ...source...>...</a>\r
 967                 // skip this "if" when the source object has been processed in aboved <img> tag\r
 968                 if (!$processed && preg_match("/\<a.*".preg_quote($row['resource'], "/").".*\<\/a\>/sU", $content))\r
 969                 {\r
 970                     $processed = true;\r
 971                     if (!$info_only) {\r
 972                         $content = preg_replace("/(.*)(\<a.*".preg_quote($row['resource'], "/").".*\<\/a\>)(.*)/sU",\r
 973                                                         $pattern_replace_to, $content);\r
 974                                         } else {\r
 975                                                 if ($row['secondary_type'] == 1) $has_audio_alternative = true;\r
 976                                                 if ($row['secondary_type'] == 2) $has_sign_lang_alternative = true;\r
 977                                                 if ($row['secondary_type'] == 3) $has_text_alternative = true;\r
 978                                                 if ($row['secondary_type'] == 4) $has_visual_alternative = true;\r
 979                                         }\r
 980                                 }\r
 981         \r
 982                                 // append/replace target alternative to <embed ... source ...>\r
 983                                 if (!$processed && preg_match("/\<embed.*".preg_quote($row['resource'], "/").".*\>/sU", $content))\r
 984                 {\r
 985                     $processed = true;\r
 986                                         if (!$info_only) {\r
 987                                                 $content = preg_replace("/(.*)(\<embed.*".preg_quote($row['resource'], "/").".*\>)(.*)/sU", \r
 988                                                         $pattern_replace_to, $content);\r
 989                                         } else {\r
 990                                                 if ($row['secondary_type'] == 1) $has_audio_alternative = true;\r
 991                                                 if ($row['secondary_type'] == 2) $has_sign_lang_alternative = true;\r
 992                                                 if ($row['secondary_type'] == 3) $has_text_alternative = true;\r
 993                                                 if ($row['secondary_type'] == 4) $has_visual_alternative = true;\r
 994                                         }\r
 995                                 }\r
 996                         }\r
 997                 }\r
 998                 \r
 999                 if (!$info_only) {\r
1000                         return $content;\r
1001                 } else {\r
1002                         return array($has_text_alternative, $has_audio_alternative, $has_visual_alternative, $has_sign_lang_alternative);\r
1003                 }\r
1004         }       \r
1005                 \r
1006         /**\r
1007          * This function save the last content_id accessed by current user on a course into db and set $_SESSION['s_cid']\r
1008          * @access: public\r
1009          * @param: $content_id\r
1010          * @return: save $content_id, the last visited one of the current user, into db and session\r
1011          */\r
1012         public static function saveLastCid($content_id)\r
1013         {\r
1014                 global $_course_id;\r
1015                 \r
1016                 if (!$content_id || !isset($_SESSION['user_id'])) return;\r
1017                 \r
1018                 include_once(TR_INCLUDE_PATH.'classes/DAO/UserCoursesDAO.class.php');\r
1019                 \r
1020                 $userCoursesDAO = new UserCoursesDAO();\r
1021                 if ($userCoursesDAO->isExist($_SESSION['user_id'], $_course_id))\r
1022                 {\r
1023                         $userCoursesDAO->UpdateLastCid($_SESSION['user_id'], $_course_id, $content_id);\r
1024                         $_SESSION['s_cid'] = $content_id;\r
1025                 }\r
1026         }\r
1027 }\r
1028 ?>