application/models/videos_model.php

   1 <?php
   2
   3 /**
   4  * Class Videos_model models videos information from the DB
   5  *
   6  * @category    Model
   7  * @author              Călin-Andrei Burloiu
   8  */
   9 class Videos_model extends CI_Model {
  10         public $db = NULL;
  11
  12         public function __construct()
  13         {
  14                 parent::__construct();
  15
  16                 if ($this->db === NULL)
  17                 {
  18                         $this->load->library('singleton_db');
  19                         $this->db = $this->singleton_db->connect();
  20                 }
  21         }
  22
  23         /**
  24          * Retrieves a set of videos information which can be used for displaying
  25          * that videos as a list with few details.
  26          *
  27          * @param               int $category_id        DB category ID; pass NULL for all
  28          * categories
  29          * @param mixed $user an user_id (as int) or an username
  30          * (as string); pass NULL for all users
  31          * @param int $offset
  32          * @param int $count number of videos to retrieve; if set to TRUE this
  33          * method will retrieve the number of videos that satisfy condition
  34          * @param string $ordering      control videos ording by these
  35          * possibilities:
  36          * <ul>
  37          *   <li><strong>'hottest':</strong> newest most appreciated first. An
  38          *   appreciated video is one which has a bigger
  39          *   score = views + likes - dislikes.</li>
  40          *   <li><strong>'newest':</strong> newest first.</li>
  41          *   <li><strong>'alphabetically':</strong> sort alphabetically.</li>
  42          * </ul>
  43          * @param bool $unactivated whether to retrieve or not ingested unactivated
  44          * videos; typically only administrators should see this kind of assets
  45          * @return array a list of videos, each one being an assoc array with:
  46          * <ul>
  47          *   <li>id, name, title, duration, thumbs_count, default_thumb, views => from DB</li>
  48          *   <li>shorted_title => ellipsized title</li>
  49          *   <li>video_url => P2P-Tube video URl</li>
  50          *   <li>user_id, user_name</li>
  51          *   <li>thumbs => thumbnail images' URLs</li>
  52          * </ul>
  53          */
  54         public function get_videos_summary($category_id, $user, $offset, $count,
  55                 $ordering = 'hottest', $unactivated = FALSE)
  56         {
  57                 $this->load->helper('text');
  58
  59                 $order_statement = "";
  60                 if ($count !== TRUE)
  61                 {
  62                         // Ordering
  63                         switch ($ordering)
  64                         {
  65                         case 'hottest':
  66                                 $order_statement = "ORDER BY date DESC, score DESC, RAND()";
  67                                 break;
  68                         case 'newest':
  69                                 $order_statement = "ORDER BY date DESC";
  70                                 break;
  71                         case 'alphabetically':
  72                                 $order_statement = "ORDER BY title";
  73                                 break;
  74
  75                         default:
  76                                 $order_statement = "";
  77                         }
  78                 }
  79
  80                 // Show unactivated videos.
  81                 $cond_unactivated = ($unactivated
  82                                 ? '(a.activation_code IS NULL OR a.activation_code IS NOT NULL
  83                                         AND a.content_ingested = 1)'
  84                                 : 'a.activation_code IS NULL');
  85
  86                 // Category filtering
  87                 if ($category_id === NULL)
  88                         $cond_category = "1";
  89                 else
  90                 {
  91                         $category_id = intval($category_id);
  92                         $cond_category = "category_id = $category_id";
  93                 }
  94
  95                 // User filtering
  96                 if ($user === NULL)
  97                         $cond_user = "1";
  98                 else
  99                 {
 100                         if (is_int($user))
 101                                 $cond_user = "v.user_id = $user";
 102                         else if (is_string($user))
 103                                 $cond_user = "u.username = '$user'";
 104                 }
 105
 106                 if ($count === TRUE)
 107                         $fields = "COUNT(*) count";
 108                 else
 109                         $fields = "v.id, name, title, duration, user_id, u.username, views,
 110                                 thumbs_count, default_thumb,
 111                                 (views + likes - dislikes) AS score,
 112                                 a.activation_code, a.content_ingested";
 113
 114                 $query = $this->db->query(
 115                         "SELECT $fields
 116                         FROM `videos` v
 117                                 LEFT JOIN `videos_unactivated` a ON (id = a.video_id),
 118                                 `users` u
 119                         WHERE v.user_id = u.id AND $cond_category AND $cond_user
 120                                 AND $cond_unactivated
 121                         $order_statement
 122                         LIMIT $offset, $count");
 123
 124                 if ($query->num_rows() > 0)
 125                 {
 126                         if ($count === TRUE)
 127                                 return $query->row()->count;
 128
 129                         $videos = $query->result_array();
 130                 }
 131                 else
 132                         return array();
 133
 134                 foreach ($videos as & $video)
 135                 {
 136                         // P2P-Tube Video URL
 137                         $video['video_url'] = site_url(sprintf("watch/%d/%s",
 138                                 $video['id'], $video['name']));
 139
 140                         // Thumbnails
 141                         $video['thumbs'] = $this->get_thumbs($video['name'],
 142                                 $video['thumbs_count']);
 143
 144                         // Ellipsized title
 145                         //$video['shorted_title'] = ellipsize($video['title'], 45, 0.75);
 146                         $video['shorted_title'] = character_limiter($video['title'], 50);
 147                 }
 148
 149                 return $videos;
 150         }
 151
 152         /**
 153          * Returns the number of videos from database from a specific category or
 154          * user.
 155          * NULL parameters count videos from all categories and / or all users.
 156          *
 157          * @param int $category_id
 158          * @param mixed $user an user_id (as int) or an username (as string)
 159          * @return int number of videos or FALSE if an error occured
 160          */
 161         public function get_videos_count($category_id = NULL, $user = NULL,
 162                         $unactivated = FALSE)
 163         {
 164                 return $this->get_videos_summary($category_id, $user, 0, TRUE, NULL,
 165                                 $unactivated);
 166         }
 167
 168         /**
 169          * Retrieves information about a video.
 170          *
 171          * If $name does not match with the video's `name` from the DB an error is
 172          * marked in the key 'err'. If it's NULL it is ignored.
 173          *
 174          * @access public
 175          * @param string $id    video's `id` column from `videos` DB table
 176          * @param string $name  video's `name` column from `videos` DB
 177          * table. NULL means there is no name provided.
 178          * @return array        an associative list with information about a video
 179          * with the following keys:
 180          * <ul>
 181          *   <li>all columns form DB with some exceptions that are overwritten or new</li>
 182          *   <li>content is moved in assets</li>
 183          *   <li>assets => list of associative lists where each one represents a</li>
 184          * video asset having keys: "src", "res", "par" and "ext". Value of key
 185          * "src" is the video torrent formated as
 186          * {name}_{format}.{video_ext}.{default_torrent_ext}</li>
 187          *   <li>username => user name from `users` table</li>
 188          *   <li>category_title => a human-friendly category name</li>
 189          *   <li>tags => associative list of "tag => score"</li>
 190          *   <li>date => date and time when the video was created</li>
 191          *   <li>thumbs => thumbnail images' URLs</li>
 192          * </ul>
 193          */
 194         public function get_video($id, $name = NULL)
 195         {
 196                 $this->load->helper('video');
 197                 $this->load->helper('text');
 198
 199                 $query = $this->db->query("SELECT v.*, u.username,
 200                                         a.activation_code, a.content_ingested
 201                                 FROM `videos` v
 202                                         LEFT JOIN `videos_unactivated` a ON (v.id = a.video_id),
 203                                         `users` u
 204                                 WHERE v.user_id = u.id AND v.id = $id");
 205                 $video = array();
 206
 207                 if ($query->num_rows() > 0)
 208                 {
 209                         $video = $query->row_array();
 210                         if ($name !== NULL && $video['name'] != $name)
 211                                 $video['err'] = 'INVALID_NAME';
 212                 }
 213                 else
 214                 {
 215                         return FALSE;
 216                 }
 217
 218                 // Convert JSON encoded string to arrays.
 219                 $video['assets'] = json_decode($video['formats'], TRUE);
 220                 unset($video['formats']);
 221                 $video['tags'] = json_decode($video['tags'], TRUE);
 222                 asort($video['tags']);
 223                 $video['tags'] = array_reverse($video['tags'], TRUE);
 224
 225                 // Sort assets by their megapixels number.
 226                 function access_function($a) { return $a['res']; }
 227                 function assets_cmp($a, $b)
 228                         { return megapixels_cmp($a, $b, "access_function"); }
 229                 usort($video['assets'], "assets_cmp");
 230
 231                 // Torrents
 232                 $video['url'] = array();
 233                 foreach ($video['assets'] as & $asset)
 234                 {
 235                         $def = substr($asset['res'], strpos($asset['res'], 'x') + 1) . 'p';
 236                         $asset['def'] = $def;
 237                         $asset['src'] = site_url('data/torrents/'. $video['name'] . '_'
 238                                 . $def . '.'. $asset['ext']
 239                                 . '.'. $this->config->item('default_torrent_ext'));
 240                 }
 241
 242                 // Category title
 243                 $categories = $this->config->item('categories');
 244                 $category_name = $categories[ intval($video['category_id']) ];
 245                 $video['category_title'] = $category_name ?
 246                         $this->lang->line("ui_categ_$category_name") : $category_name;
 247
 248                 // Thumbnails
 249                 $video['thumbs'] = $this->get_thumbs($video['name'], $video['thumbs_count']);
 250
 251                 // Shorted description
 252                 $video['shorted_description'] = character_limiter(
 253                                 $video['description'], 128);
 254
 255                 return $video;
 256         }
 257
 258         /**
 259          * Adds a new uploaded video to the DB.
 260          *
 261          * @param string $name
 262          * @param string $title
 263          * @param string $description
 264          * @param string $tags comma separated tags
 265          * @param string $duration video duration formatted [HH:]mm:ss
 266          * @param array $formats a dictionary corresponding to `formats` JSON
 267          * column from `videos` table
 268          * @param int $category_id
 269          * @param int $user_id
 270          * @param string $uploaded_file the raw video file uploaded by the user
 271          * @return mixed returns an activation code on success or FALSE otherwise
 272          */
 273         public function add_video($name, $title, $description, $tags, $duration,
 274                         $formats, $category_id, $user_id, $uploaded_file)
 275         {
 276                 // Tags.
 277                 $json_tags = array();
 278                 $tok = strtok($tags, ',');
 279                 while ($tok != FALSE)
 280                 {
 281                         $json_tags[trim($tok)] = 0;
 282
 283                         $tok = strtok(',');
 284                 }
 285                 $json_tags = json_encode($json_tags);
 286
 287                 // TODO formats
 288                 $json_formats = json_encode($formats);
 289
 290                 $query = $this->db->query("INSERT INTO `videos`
 291                                 (name, title, description, duration, formats, category_id,
 292                                                 user_id, tags, date)
 293                                 VALUES ('$name', '$title', '$description', '$duration',
 294                                                 '$json_formats', $category_id,
 295                                                 $user_id, '$json_tags', utc_timestamp())");
 296                 if ($query === FALSE)
 297                         return FALSE;
 298
 299                 // Find out the id of the new video added.
 300                 $query = $this->db->query("SELECT id from `videos`
 301                                 WHERE name = '$name'");
 302                 if ($query->num_rows() === 0)
 303                         return FALSE;
 304                 $video_id = $query->row()->id;
 305
 306                 // Activation code.
 307                 $activation_code = Videos_model::gen_activation_code();
 308
 309                 $query = $this->db->query("INSERT INTO `videos_unactivated`
 310                                 (video_id, activation_code, uploaded_file)
 311                                 VALUES ($video_id, '$activation_code', '$uploaded_file')");
 312
 313                 return $activation_code;
 314         }
 315
 316         public function set_content_ingested($activation_code)
 317         {
 318                 return $this->db->query("UPDATE `videos_unactivated`
 319                         SET content_ingested = 1
 320                         WHERE activation_code = '$activation_code'");
 321         }
 322
 323         /**
 324          * Activates a video by deleting its entry from `videos_unactivated`.
 325          *
 326          * @param mixed $code_or_id use type string for activation_code or type
 327          * int for video_id
 328          * @return boolean TRUE on success, FALSE otherwise
 329          */
 330         public function activate_video($code_or_id)
 331         {
 332                 if (is_string($code_or_id))
 333                         $query = $this->db->query("SELECT uploaded_file from `videos_unactivated`
 334                                 WHERE activation_code = '$code_or_id'");
 335                 else if (is_int($code_or_id))
 336                         $query = $this->db->query("SELECT uploaded_file from `videos_unactivated`
 337                                 WHERE video_id = '$code_or_id'");
 338                 else
 339                         return FALSE;
 340
 341                 if ($query->num_rows() > 0)
 342                         $uploaded_file = $query->row()->uploaded_file;
 343                 else
 344                         return FALSE;
 345
 346                 if (is_string($code_or_id))
 347                         $query = $this->db->query("DELETE FROM `videos_unactivated`
 348                                 WHERE activation_code = '$code_or_id'");
 349                 else if (is_int($code_or_id))
 350                         $query = $this->db->query("DELETE FROM `videos_unactivated`
 351                                 WHERE video_id = '$code_or_id'");
 352                 else
 353                         return FALSE;
 354
 355                 if (!$query)
 356                         return $query;
 357
 358                 return unlink("data/upload/$uploaded_file");
 359         }
 360
 361         public function get_unactivated_videos()
 362         {
 363                 $query = $this->db->query("SELECT a.video_id, v.name, a.content_ingested
 364                         FROM `videos_unactivated` a, `videos` v
 365                         WHERE a.video_id = v.id AND a.content_ingested = 1");
 366
 367                 if ($query->num_rows() > 0)
 368                         return $query->result_array();
 369                 else
 370                         return FALSE;
 371         }
 372
 373         /**
 374          * Retrieves comments for a video.
 375          *
 376          * @param int $video_id
 377          * @param int $offset
 378          * @param int $count
 379          * @param string $ordering      control comments ording by these possibilities:
 380          * <ul>
 381          *   <li><strong>'hottest':</strong> newest most appreciated first. An
 382          *   appreciated comment is one which has a bigger
 383          *   score = likes - dislikes.</li>
 384          *   <li><strong>'newest':</strong> newest first.</li>
 385          * </ul>
 386          * @return array        an array with comments
 387          */
 388         public function get_video_comments($video_id, $offset, $count,
 389                         $ordering = 'newest')
 390         {
 391                 $this->load->helper('date');
 392                 $cond_hottest = '';
 393
 394                 // Ordering
 395                 switch ($ordering)
 396                 {
 397                 case 'newest':
 398                         $order_statement = "ORDER BY time DESC";
 399                         break;
 400                 case 'hottest':
 401                         $order_statement = "ORDER BY score DESC, time DESC";
 402                         $cond_hottest = "AND c.likes + c.dislikes > 0";
 403                         break;
 404
 405                 default:
 406                         $order_statement = "";
 407                 }
 408
 409                 $query = $this->db->query(
 410                         "SELECT c.*, u.username, u.time_zone, (c.likes + c.dislikes) AS score
 411                                 FROM `videos_comments` c, `users` u
 412                                 WHERE c.user_id = u.id AND video_id = $video_id $cond_hottest
 413                                 $order_statement
 414                                 LIMIT $offset, $count");
 415
 416                 if ($query->num_rows() == 0)
 417                         return array();
 418
 419                 $comments = $query->result_array();
 420
 421                 foreach ($comments as & $comment)
 422                 {
 423                         $comment['local_time'] = human_gmt_to_human_local($comment['time'],
 424                                 $comment['time_zone']);
 425                 }
 426
 427                 return $comments;
 428         }
 429
 430         public function get_video_comments_count($video_id)
 431         {
 432                 $query = $this->db->query(
 433                                         "SELECT COUNT(*) count
 434                                                 FROM `videos_comments`
 435                                                 WHERE video_id = $video_id");
 436
 437                 if ($query->num_rows() == 0)
 438                         return FALSE;
 439
 440                 return $query->row()->count;
 441         }
 442
 443         /**
 444          * Insert in DB a comment for a video.
 445          *
 446          * @param int $video_id
 447          * @param int $user_id
 448          * @param string $content
 449          */
 450         public function comment_video($video_id, $user_id, $content)
 451         {
 452                 // Prepping content.
 453                 $content = substr($content, 0, 512);
 454                 $content = htmlspecialchars($content);
 455                 $content = nl2br($content);
 456
 457                 return $query = $this->db->query(
 458                         "INSERT INTO `videos_comments` (video_id, user_id, content, time)
 459                         VALUES ($video_id, $user_id, '$content', UTC_TIMESTAMP())");
 460         }
 461
 462         /**
 463          * Increments views count for a video.
 464          *
 465          * @param int $id       DB video id
 466          * @return void
 467          */
 468         public function inc_views($id)
 469         {
 470                 return $this->db->query('UPDATE `videos` '
 471                                                 . 'SET `views`=`views`+1 '
 472                                                 . 'WHERE id='. $id);
 473         }
 474
 475         public function vote($video_id, $user_id, $like = TRUE)
 476         {
 477                 if ($like)
 478                 {
 479                         $col = 'likes';
 480                         $action = 'like';
 481                 }
 482                 else
 483                 {
 484                         $col = 'dislikes';
 485                         $action = 'dislike';
 486                 }
 487
 488                 $query = $this->db->query("SELECT * FROM `users_actions`
 489                         WHERE user_id = $user_id
 490                                 AND target_id = $video_id
 491                                 AND target_type = 'video'
 492                                 AND action = '$action'
 493                                 AND date = CURDATE()");
 494                 // User already voted today
 495                 if ($query->num_rows() > 0)
 496                         return -1;
 497
 498                 $this->db->query("UPDATE `videos`
 499                         SET $col = $col + 1
 500                         WHERE id = $video_id");
 501
 502                 // Mark this action so that the user cannot repeat it today.
 503                 $this->db->query("INSERT INTO `users_actions`
 504                                 (user_id, action, target_type, target_id, date)
 505                         VALUES ( $user_id, '$action', 'video', $video_id, CURDATE() )");
 506
 507                 $query = $this->db->query("SELECT $col FROM `videos`
 508                         WHERE id = $video_id");
 509
 510                 if ($query->num_rows() === 1)
 511                 {
 512                         $row = $query->row_array();
 513                         return $row[ $col ];
 514                 }
 515
 516                 // Error
 517                 return FALSE;
 518         }
 519
 520         public function vote_comment($comment_id, $user_id, $like = TRUE)
 521         {
 522                 if ($like)
 523                 {
 524                         $col = 'likes';
 525                         $action = 'like';
 526                 }
 527                 else
 528                 {
 529                         $col = 'dislikes';
 530                         $action = 'dislike';
 531                 }
 532
 533                 $query = $this->db->query("SELECT * FROM `users_actions`
 534                                 WHERE user_id = $user_id
 535                                         AND target_id = $comment_id
 536                                         AND target_type = 'vcomment'
 537                                         AND action = '$action'
 538                                         AND date = CURDATE()");
 539                 // User already voted today
 540                 if ($query->num_rows() > 0)
 541                         return -1;
 542
 543                 $this->db->query("UPDATE `videos_comments`
 544                                 SET $col = $col + 1
 545                                 WHERE id = $comment_id");
 546
 547                 // Mark this action so that the user cannot repeat it today.
 548                 $this->db->query("INSERT INTO `users_actions`
 549                                         (user_id, action, target_type, target_id, date)
 550                                 VALUES ( $user_id, '$action', 'vcomment', $comment_id, CURDATE() )");
 551
 552                 $query = $this->db->query("SELECT $col FROM `videos_comments`
 553                                 WHERE id = $comment_id");
 554
 555                 if ($query->num_rows() === 1)
 556                 {
 557                         $row = $query->row_array();
 558                         return $row[ $col ];
 559                 }
 560
 561                 // Error
 562                 return FALSE;
 563         }
 564
 565         public function get_thumbs($name, $count)
 566         {
 567                 $thumbs = array();
 568
 569                 for ($i=0; $i < $count; $i++)
 570                         $thumbs[] = site_url(sprintf("data/thumbs/%s_t%02d.jpg", $name, $i));
 571
 572                 return $thumbs;
 573         }
 574
 575         /**
 576          * Searches videos in DB based on a search query string and returns an
 577          * associative array of results.
 578          * If count is zero the function only return the number of results.
 579          * @param string $search_query
 580          * @param int $offset
 581          * @param int $count
 582          * @param int $category_id      if NULL, all categories are searched
 583          * @return array        an associative array with the same keys as that from
 584          * get_videos_summary's result, but with two additional keys:
 585          * description and date.
 586          */
 587         public function search_videos($search_query, $offset = 0, $count = 0,
 588                                                                         $category_id = NULL)
 589         {
 590                 $search_query = trim($search_query);
 591                 $search_query = str_replace("'", " ", $search_query);
 592
 593                 // Search word fragments.
 594                 // sfc = search fragment condition
 595                 $sfc = "( ";
 596                 // sfr = search fragment relevance
 597                 $sfr = "( ";
 598                 $sep = ' +-*<>()~"';
 599                 $fragm = strtok($search_query, $sep);
 600                 while ($fragm !== FALSE)
 601                 {
 602                         $sfc .= "(title LIKE '%$fragm%'
 603                                         OR description LIKE '%$fragm%'
 604                                         OR tags LIKE '%$fragm%') OR ";
 605
 606                         // Frament relevances are half of boolean relevances such
 607                         // that they will appear at the end of the results.
 608                         $sfr .= "0.25 * (title LIKE '%$fragm%')
 609                                         + 0.1 * (description LIKE '%$fragm%')
 610                                         + 0.15 * (tags LIKE '%$fragm%') + ";
 611
 612                         $fragm = strtok($sep);
 613                 }
 614                 $sfc = substr($sfc, 0, -4) . " )";
 615                 $sfr = substr($sfr, 0, -3) . " )";
 616
 617                 if (! $this->is_advanced_search_query($search_query))
 618                 {
 619                         $search_cond = "MATCH (title, description, tags)
 620                                         AGAINST ('$search_query') OR $sfc";
 621                         $relevance = "( MATCH (title, description, tags)
 622                                         AGAINST ('$search_query') + $sfr ) AS relevance";
 623                 }
 624                 // boolean mode
 625                 else
 626                 {
 627                         $against = "AGAINST ('$search_query' IN BOOLEAN MODE)";
 628                         $search_cond = "( MATCH (title, description, tags)
 629                                         $against) OR $sfc";
 630                         $relevance = "( 0.5 * (MATCH(title) $against)
 631                                         + 0.3 * (MATCH(tags) $against)
 632                                         + 0.2 * (MATCH(description) $against)
 633                                         + $sfr) AS relevance";
 634                 }
 635
 636                 if ($count === 0)
 637                 {
 638                         $selected_columns = "COUNT(*) count";
 639                         $order = "";
 640                         $limit = "";
 641                 }
 642                 else
 643                 {
 644                         // TODO select data, description if details are needed
 645                         $selected_columns = "v.id, name, title, duration, user_id, views,
 646                                         thumbs_count, default_thumb, u.username,
 647                                         (views + likes - dislikes) AS score,
 648                                         $relevance";
 649                         $order = "ORDER BY relevance DESC, score DESC";
 650                         $limit = "LIMIT $offset, $count";
 651                 }
 652
 653                 if ($category_id !== NULL)
 654                         $category_cond = "category_id = '$category_id' AND ";
 655                 else
 656                         $category_cond = "";
 657
 658                 $str_query = "SELECT $selected_columns
 659                         FROM `videos` v, `users` u
 660                         WHERE  v.user_id = u.id AND $category_cond ( $search_cond )
 661                         $order
 662                         $limit";
 663 //              echo "<p>$str_query</p>";
 664                 $query = $this->db->query($str_query);
 665
 666                 if ($query->num_rows() > 0)
 667                 {
 668                         if ($count === 0)
 669                                 return $query->row()->count;
 670                         else
 671                                 $videos = $query->result_array();
 672                 }
 673                 else
 674                         return NULL;
 675
 676                 $this->load->helper('text');
 677
 678                 foreach ($videos as & $video)
 679                 {
 680                         // P2P-Tube Video URL
 681                         $video['video_url'] = site_url(sprintf("watch/%d/%s",
 682                                 $video['id'], $video['name']));
 683
 684                         // Thumbnails
 685                         $video['thumbs'] = $this->get_thumbs($video['name'],
 686                                 $video['thumbs_count']);
 687
 688                         // Ellipsized title
 689                         //$video['shorted_title'] = ellipsize($video['title'], 45, 0.75);
 690                         $video['shorted_title'] = character_limiter($video['title'], 50);
 691
 692                         // TODO: user information
 693                         $video['user_name'] = 'TODO';
 694                 }
 695
 696                 return $videos;
 697         }
 698
 699         public function decode_search_query($search_query)
 700         {
 701                 $search_query = urldecode($search_query);
 702
 703                 $search_query = str_replace('_AST_', '*', $search_query);
 704                 $search_query = str_replace('_AND_', '+', $search_query);
 705                 $search_query = str_replace('_GT_', '>', $search_query);
 706                 $search_query = str_replace('_LT_', '<', $search_query);
 707                 $search_query = str_replace('_PO_', '(', $search_query);
 708                 $search_query = str_replace('_PC_', ')', $search_query);
 709                 $search_query = str_replace('_LOW_', '~', $search_query);
 710                 $search_query = str_replace('_QUO_', '"', $search_query);
 711
 712                 return $search_query;
 713         }
 714
 715         public function encode_search_query($search_query)
 716         {
 717                 $search_query = str_replace('*', '_AST_', $search_query);
 718                 $search_query = str_replace('+', '_AND_', $search_query);
 719                 $search_query = str_replace('>', '_GT_', $search_query);
 720                 $search_query = str_replace('<', '_LT_', $search_query);
 721                 $search_query = str_replace('(', '_PO_', $search_query);
 722                 $search_query = str_replace(')', '_PC_', $search_query);
 723                 $search_query = str_replace('~', '_LOW_', $search_query);
 724                 $search_query = str_replace('"', '_QUO_', $search_query);
 725
 726                 $search_query = urlencode($search_query);
 727
 728                 return $search_query;
 729         }
 730
 731         /**
 732          * Return TRUE if it contains any special caracter from an advanced search
 733          * query.
 734          * @param string $search_query
 735          * @return boolean
 736          */
 737         public function is_advanced_search_query($search_query)
 738         {
 739                 return (preg_match('/\*|\+|\-|>|\<|\(|\)|~|"/', $search_query) == 0
 740                         ? FALSE : TRUE);
 741         }
 742
 743         public static function gen_activation_code()
 744         {
 745                 $ci =& get_instance();
 746
 747                 $activation_code = substr(
 748                         sha1($ci->config->item('encryption_key')
 749                                 . mt_rand()),
 750                         0,
 751                         16);
 752
 753                 return $activation_code;
 754         }
 755 }
 756
 757 /* End of file videos_model.php */
 758 /* Location: ./application/models/videos_model.php */