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                         $video['json_thumbs'] = json_encode($video['thumbs']);
 144
 145                         // Ellipsized title
 146                         //$video['shorted_title'] = ellipsize($video['title'], 45, 0.75);
 147                         $video['shorted_title'] = character_limiter($video['title'], 50);
 148                 }
 149
 150                 return $videos;
 151         }
 152
 153         /**
 154          * Returns the number of videos from database from a specific category or
 155          * user.
 156          * NULL parameters count videos from all categories and / or all users.
 157          *
 158          * @param int $category_id
 159          * @param mixed $user an user_id (as int) or an username (as string)
 160          * @return int number of videos or FALSE if an error occured
 161          */
 162         public function get_videos_count($category_id = NULL, $user = NULL,
 163                         $unactivated = FALSE)
 164         {
 165                 return $this->get_videos_summary($category_id, $user, 0, TRUE, NULL,
 166                                 $unactivated);
 167         }
 168
 169         /**
 170          * Retrieves information about a video.
 171          *
 172          * If $name does not match with the video's `name` from the DB an error is
 173          * marked in the key 'err'. If it's NULL it is ignored.
 174          *
 175          * @access public
 176          * @param string $id    video's `id` column from `videos` DB table
 177          * @param string $name  video's `name` column from `videos` DB
 178          * table. NULL means there is no name provided.
 179          * @return array        an associative list with information about a video
 180          * with the following keys:
 181          * <ul>
 182          *   <li>all columns form DB with some exceptions that are overwritten or new</li>
 183          *   <li>content is moved in assets</li>
 184          *   <li>assets => list of associative lists where each one represents a</li>
 185          * video asset having keys: "src", "res", "par" and "ext". Value of key
 186          * "src" is the video torrent formated as
 187          * {name}_{format}.{video_ext}.{default_torrent_ext}</li>
 188          *   <li>username => user name from `users` table</li>
 189          *   <li>category_title => a human-friendly category name</li>
 190          *   <li>tags => associative list of "tag => score"</li>
 191          *   <li>date => date and time when the video was created</li>
 192          *   <li>thumbs => thumbnail images' URLs</li>
 193          * </ul>
 194          */
 195         public function get_video($id, $name = NULL)
 196         {
 197                 $this->load->helper('video');
 198                 $this->load->helper('text');
 199
 200                 $query = $this->db->query("SELECT v.*, u.username,
 201                                         a.activation_code, a.content_ingested
 202                                 FROM `videos` v
 203                                         LEFT JOIN `videos_unactivated` a ON (v.id = a.video_id),
 204                                         `users` u
 205                                 WHERE v.user_id = u.id AND v.id = $id");
 206                 $video = array();
 207
 208                 if ($query->num_rows() > 0)
 209                 {
 210                         $video = $query->row_array();
 211                         if ($name !== NULL && $video['name'] != $name)
 212                                 $video['err'] = 'INVALID_NAME';
 213                 }
 214                 else
 215                 {
 216                         return FALSE;
 217                 }
 218
 219                 // Convert JSON encoded string to arrays.
 220                 $video['assets'] = json_decode($video['formats'], TRUE);
 221                 unset($video['formats']);
 222                 $video['tags'] = json_decode($video['tags'], TRUE);
 223                 asort($video['tags']);
 224                 $video['tags'] = array_reverse($video['tags'], TRUE);
 225
 226                 // Sort assets by their megapixels number.
 227                 function access_function($a) { return $a['res']; }
 228                 function assets_cmp($a, $b)
 229                         { return megapixels_cmp($a, $b, "access_function"); }
 230                 usort($video['assets'], "assets_cmp");
 231
 232                 // Torrents
 233                 $video['url'] = array();
 234                 foreach ($video['assets'] as & $asset)
 235                 {
 236                         $def = substr($asset['res'], strpos($asset['res'], 'x') + 1) . 'p';
 237                         $asset['def'] = $def;
 238                         $asset['src'] = site_url('data/torrents/'. $video['name'] . '_'
 239                                 . $def . '.'. $asset['ext']
 240                                 . '.'. $this->config->item('default_torrent_ext'));
 241                 }
 242
 243                 // Category title
 244                 $categories = $this->config->item('categories');
 245                 $category_name = $categories[ intval($video['category_id']) ];
 246                 $video['category_title'] = $category_name ?
 247                         $this->lang->line("ui_categ_$category_name") : $category_name;
 248
 249                 // Thumbnails
 250                 $video['thumbs'] = $this->get_thumbs($video['name'], $video['thumbs_count']);
 251
 252                 // Shorted description
 253                 $video['shorted_description'] = character_limiter(
 254                                 $video['description'], 128);
 255
 256                 return $video;
 257         }
 258
 259         /**
 260          * Adds a new uploaded video to the DB.
 261          *
 262          * @param string $name
 263          * @param string $title
 264          * @param string $description
 265          * @param string $tags comma separated tags
 266          * @param string $duration video duration formatted [HH:]mm:ss
 267          * @param array $formats a dictionary corresponding to `formats` JSON
 268          * column from `videos` table
 269          * @param int $category_id
 270          * @param int $user_id
 271          * @param string $uploaded_file the raw video file uploaded by the user
 272          * @return mixed returns an activation code on success or FALSE otherwise
 273          */
 274         public function add_video($name, $title, $description, $tags, $duration,
 275                         $formats, $category_id, $user_id, $uploaded_file)
 276         {
 277                 $this->load->config('content_ingestion');
 278
 279                 // Tags.
 280                 $json_tags = array();
 281                 $tok = strtok($tags, ',');
 282                 while ($tok != FALSE)
 283                 {
 284                         $json_tags[trim($tok)] = 0;
 285
 286                         $tok = strtok(',');
 287                 }
 288                 $json_tags = json_encode($json_tags);
 289
 290                 $json_formats = json_encode($formats);
 291
 292                 // Thumbnail images
 293                 $thumbs_count = $this->config->item('thumbs_count');
 294                 $default_thumb = rand(0, $thumbs_count - 1);
 295
 296                 $query = $this->db->query("INSERT INTO `videos`
 297                                 (name, title, description, duration, formats, category_id,
 298                                                 user_id, tags, date, thumbs_count, default_thumb)
 299                                 VALUES ('$name', '$title', '$description', '$duration',
 300                                                 '$json_formats', $category_id,
 301                                                 $user_id, '$json_tags', utc_timestamp(),
 302                                                 $thumbs_count, $default_thumb)");
 303                 if ($query === FALSE)
 304                         return FALSE;
 305
 306                 // Find out the id of the new video added.
 307                 $query = $this->db->query("SELECT id from `videos`
 308                                 WHERE name = '$name'");
 309                 if ($query->num_rows() === 0)
 310                         return FALSE;
 311                 $video_id = $query->row()->id;
 312
 313                 // Activation code.
 314                 $activation_code = Videos_model::gen_activation_code();
 315
 316                 $query = $this->db->query("INSERT INTO `videos_unactivated`
 317                                 (video_id, activation_code, uploaded_file)
 318                                 VALUES ($video_id, '$activation_code', '$uploaded_file')");
 319
 320                 return $activation_code;
 321         }
 322
 323         public function set_content_ingested($activation_code)
 324         {
 325                 return $this->db->query("UPDATE `videos_unactivated`
 326                         SET content_ingested = 1
 327                         WHERE activation_code = '$activation_code'");
 328         }
 329
 330         /**
 331          * Activates a video by deleting its entry from `videos_unactivated`.
 332          *
 333          * @param mixed $code_or_id use type string for activation_code or type
 334          * int for video_id
 335          * @return boolean TRUE on success, FALSE otherwise
 336          */
 337         public function activate_video($code_or_id)
 338         {
 339                 if (is_string($code_or_id))
 340                         $query = $this->db->query("SELECT uploaded_file from `videos_unactivated`
 341                                 WHERE activation_code = '$code_or_id'");
 342                 else if (is_int($code_or_id))
 343                         $query = $this->db->query("SELECT uploaded_file from `videos_unactivated`
 344                                 WHERE video_id = '$code_or_id'");
 345                 else
 346                         return FALSE;
 347
 348                 if ($query->num_rows() > 0)
 349                         $uploaded_file = $query->row()->uploaded_file;
 350                 else
 351                         return FALSE;
 352
 353                 if (is_string($code_or_id))
 354                         $query = $this->db->query("DELETE FROM `videos_unactivated`
 355                                 WHERE activation_code = '$code_or_id'");
 356                 else if (is_int($code_or_id))
 357                         $query = $this->db->query("DELETE FROM `videos_unactivated`
 358                                 WHERE video_id = '$code_or_id'");
 359                 else
 360                         return FALSE;
 361
 362                 if (!$query)
 363                         return $query;
 364
 365                 return unlink("data/upload/$uploaded_file");
 366         }
 367
 368         public function get_unactivated_videos()
 369         {
 370                 $query = $this->db->query("SELECT a.video_id, v.name, a.content_ingested
 371                         FROM `videos_unactivated` a, `videos` v
 372                         WHERE a.video_id = v.id AND a.content_ingested = 1");
 373
 374                 if ($query->num_rows() > 0)
 375                         return $query->result_array();
 376                 else
 377                         return FALSE;
 378         }
 379
 380         /**
 381          * Retrieves comments for a video.
 382          *
 383          * @param int $video_id
 384          * @param int $offset
 385          * @param int $count
 386          * @param string $ordering      control comments ording by these possibilities:
 387          * <ul>
 388          *   <li><strong>'hottest':</strong> newest most appreciated first. An
 389          *   appreciated comment is one which has a bigger
 390          *   score = likes - dislikes.</li>
 391          *   <li><strong>'newest':</strong> newest first.</li>
 392          * </ul>
 393          * @return array        an array with comments
 394          */
 395         public function get_video_comments($video_id, $offset, $count,
 396                         $ordering = 'newest')
 397         {
 398                 $this->load->helper('date');
 399                 $cond_hottest = '';
 400
 401                 // Ordering
 402                 switch ($ordering)
 403                 {
 404                 case 'newest':
 405                         $order_statement = "ORDER BY time DESC";
 406                         break;
 407                 case 'hottest':
 408                         $order_statement = "ORDER BY score DESC, time DESC";
 409                         $cond_hottest = "AND c.likes + c.dislikes > 0";
 410                         break;
 411
 412                 default:
 413                         $order_statement = "";
 414                 }
 415
 416                 $query = $this->db->query(
 417                         "SELECT c.*, u.username, u.time_zone, (c.likes + c.dislikes) AS score
 418                                 FROM `videos_comments` c, `users` u
 419                                 WHERE c.user_id = u.id AND video_id = $video_id $cond_hottest
 420                                 $order_statement
 421                                 LIMIT $offset, $count");
 422
 423                 if ($query->num_rows() == 0)
 424                         return array();
 425
 426                 $comments = $query->result_array();
 427
 428                 foreach ($comments as & $comment)
 429                 {
 430                         $comment['local_time'] = human_gmt_to_human_local($comment['time'],
 431                                 $comment['time_zone']);
 432                 }
 433
 434                 return $comments;
 435         }
 436
 437         public function get_video_comments_count($video_id)
 438         {
 439                 $query = $this->db->query(
 440                                         "SELECT COUNT(*) count
 441                                                 FROM `videos_comments`
 442                                                 WHERE video_id = $video_id");
 443
 444                 if ($query->num_rows() == 0)
 445                         return FALSE;
 446
 447                 return $query->row()->count;
 448         }
 449
 450         /**
 451          * Insert in DB a comment for a video.
 452          *
 453          * @param int $video_id
 454          * @param int $user_id
 455          * @param string $content
 456          */
 457         public function comment_video($video_id, $user_id, $content)
 458         {
 459                 // Prepping content.
 460                 $content = substr($content, 0, 512);
 461                 $content = htmlspecialchars($content);
 462                 $content = nl2br($content);
 463
 464                 return $query = $this->db->query(
 465                         "INSERT INTO `videos_comments` (video_id, user_id, content, time)
 466                         VALUES ($video_id, $user_id, '$content', UTC_TIMESTAMP())");
 467         }
 468
 469         /**
 470          * Increments views count for a video.
 471          *
 472          * @param int $id       DB video id
 473          * @return void
 474          */
 475         public function inc_views($id)
 476         {
 477                 return $this->db->query('UPDATE `videos` '
 478                                                 . 'SET `views`=`views`+1 '
 479                                                 . 'WHERE id='. $id);
 480         }
 481
 482         public function vote($video_id, $user_id, $like = TRUE)
 483         {
 484                 if ($like)
 485                 {
 486                         $col = 'likes';
 487                         $action = 'like';
 488                 }
 489                 else
 490                 {
 491                         $col = 'dislikes';
 492                         $action = 'dislike';
 493                 }
 494
 495                 $query = $this->db->query("SELECT * FROM `users_actions`
 496                         WHERE user_id = $user_id
 497                                 AND target_id = $video_id
 498                                 AND target_type = 'video'
 499                                 AND action = '$action'
 500                                 AND date = CURDATE()");
 501                 // User already voted today
 502                 if ($query->num_rows() > 0)
 503                         return -1;
 504
 505                 $this->db->query("UPDATE `videos`
 506                         SET $col = $col + 1
 507                         WHERE id = $video_id");
 508
 509                 // Mark this action so that the user cannot repeat it today.
 510                 $this->db->query("INSERT INTO `users_actions`
 511                                 (user_id, action, target_type, target_id, date)
 512                         VALUES ( $user_id, '$action', 'video', $video_id, CURDATE() )");
 513
 514                 $query = $this->db->query("SELECT $col FROM `videos`
 515                         WHERE id = $video_id");
 516
 517                 if ($query->num_rows() === 1)
 518                 {
 519                         $row = $query->row_array();
 520                         return $row[ $col ];
 521                 }
 522
 523                 // Error
 524                 return FALSE;
 525         }
 526
 527         public function vote_comment($comment_id, $user_id, $like = TRUE)
 528         {
 529                 if ($like)
 530                 {
 531                         $col = 'likes';
 532                         $action = 'like';
 533                 }
 534                 else
 535                 {
 536                         $col = 'dislikes';
 537                         $action = 'dislike';
 538                 }
 539
 540                 $query = $this->db->query("SELECT * FROM `users_actions`
 541                                 WHERE user_id = $user_id
 542                                         AND target_id = $comment_id
 543                                         AND target_type = 'vcomment'
 544                                         AND action = '$action'
 545                                         AND date = CURDATE()");
 546                 // User already voted today
 547                 if ($query->num_rows() > 0)
 548                         return -1;
 549
 550                 $this->db->query("UPDATE `videos_comments`
 551                                 SET $col = $col + 1
 552                                 WHERE id = $comment_id");
 553
 554                 // Mark this action so that the user cannot repeat it today.
 555                 $this->db->query("INSERT INTO `users_actions`
 556                                         (user_id, action, target_type, target_id, date)
 557                                 VALUES ( $user_id, '$action', 'vcomment', $comment_id, CURDATE() )");
 558
 559                 $query = $this->db->query("SELECT $col FROM `videos_comments`
 560                                 WHERE id = $comment_id");
 561
 562                 if ($query->num_rows() === 1)
 563                 {
 564                         $row = $query->row_array();
 565                         return $row[ $col ];
 566                 }
 567
 568                 // Error
 569                 return FALSE;
 570         }
 571
 572         public function get_thumbs($name, $count)
 573         {
 574                 $thumbs = array();
 575
 576                 for ($i=0; $i < $count; $i++)
 577                         $thumbs[] = site_url(sprintf("data/thumbs/%s_t%02d.jpg", $name, $i));
 578
 579                 return $thumbs;
 580         }
 581
 582         /**
 583          * Searches videos in DB based on a search query string and returns an
 584          * associative array of results.
 585          * If count is zero the function only return the number of results.
 586          * @param string $search_query
 587          * @param int $offset
 588          * @param int $count
 589          * @param int $category_id      if NULL, all categories are searched
 590          * @return array        an associative array with the same keys as that from
 591          * get_videos_summary's result, but with two additional keys:
 592          * description and date.
 593          */
 594         public function search_videos($search_query, $offset = 0, $count = 0,
 595                                                                         $category_id = NULL)
 596         {
 597                 $search_query = trim($search_query);
 598                 $search_query = str_replace("'", " ", $search_query);
 599
 600                 // Search word fragments.
 601                 // sfc = search fragment condition
 602                 $sfc = "( ";
 603                 // sfr = search fragment relevance
 604                 $sfr = "( ";
 605                 $sep = ' +-*<>()~"';
 606                 $fragm = strtok($search_query, $sep);
 607                 while ($fragm !== FALSE)
 608                 {
 609                         $sfc .= "(title LIKE '%$fragm%'
 610                                         OR description LIKE '%$fragm%'
 611                                         OR tags LIKE '%$fragm%') OR ";
 612
 613                         // Frament relevances are half of boolean relevances such
 614                         // that they will appear at the end of the results.
 615                         $sfr .= "0.25 * (title LIKE '%$fragm%')
 616                                         + 0.1 * (description LIKE '%$fragm%')
 617                                         + 0.15 * (tags LIKE '%$fragm%') + ";
 618
 619                         $fragm = strtok($sep);
 620                 }
 621                 $sfc = substr($sfc, 0, -4) . " )";
 622                 $sfr = substr($sfr, 0, -3) . " )";
 623
 624                 if (! $this->is_advanced_search_query($search_query))
 625                 {
 626                         $search_cond = "MATCH (title, description, tags)
 627                                         AGAINST ('$search_query') OR $sfc";
 628                         $relevance = "( MATCH (title, description, tags)
 629                                         AGAINST ('$search_query') + $sfr ) AS relevance";
 630                 }
 631                 // boolean mode
 632                 else
 633                 {
 634                         $against = "AGAINST ('$search_query' IN BOOLEAN MODE)";
 635                         $search_cond = "( MATCH (title, description, tags)
 636                                         $against) OR $sfc";
 637                         $relevance = "( 0.5 * (MATCH(title) $against)
 638                                         + 0.3 * (MATCH(tags) $against)
 639                                         + 0.2 * (MATCH(description) $against)
 640                                         + $sfr) AS relevance";
 641                 }
 642
 643                 if ($count === 0)
 644                 {
 645                         $selected_columns = "COUNT(*) count";
 646                         $order = "";
 647                         $limit = "";
 648                 }
 649                 else
 650                 {
 651                         // TODO select data, description if details are needed
 652                         $selected_columns = "v.id, name, title, duration, user_id, views,
 653                                         thumbs_count, default_thumb, u.username,
 654                                         (views + likes - dislikes) AS score,
 655                                         $relevance";
 656                         $order = "ORDER BY relevance DESC, score DESC";
 657                         $limit = "LIMIT $offset, $count";
 658                 }
 659
 660                 if ($category_id !== NULL)
 661                         $category_cond = "category_id = '$category_id' AND ";
 662                 else
 663                         $category_cond = "";
 664
 665                 $str_query = "SELECT $selected_columns
 666                         FROM `videos` v, `users` u
 667                         WHERE  v.user_id = u.id AND $category_cond ( $search_cond )
 668                         $order
 669                         $limit";
 670 //              echo "<p>$str_query</p>";
 671                 $query = $this->db->query($str_query);
 672
 673                 if ($query->num_rows() > 0)
 674                 {
 675                         if ($count === 0)
 676                                 return $query->row()->count;
 677                         else
 678                                 $videos = $query->result_array();
 679                 }
 680                 else
 681                         return NULL;
 682
 683                 $this->load->helper('text');
 684
 685                 foreach ($videos as & $video)
 686                 {
 687                         // P2P-Tube Video URL
 688                         $video['video_url'] = site_url(sprintf("watch/%d/%s",
 689                                 $video['id'], $video['name']));
 690
 691                         // Thumbnails
 692                         $video['thumbs'] = $this->get_thumbs($video['name'],
 693                                 $video['thumbs_count']);
 694                         $video['json_thumbs'] = json_encode($video['thumbs']);
 695
 696                         // Ellipsized title
 697                         //$video['shorted_title'] = ellipsize($video['title'], 45, 0.75);
 698                         $video['shorted_title'] = character_limiter($video['title'], 50);
 699
 700                         // TODO: user information
 701                         $video['user_name'] = 'TODO';
 702                 }
 703
 704                 return $videos;
 705         }
 706
 707         public function decode_search_query($search_query)
 708         {
 709                 $search_query = urldecode($search_query);
 710
 711                 $search_query = str_replace('_AST_', '*', $search_query);
 712                 $search_query = str_replace('_AND_', '+', $search_query);
 713                 $search_query = str_replace('_GT_', '>', $search_query);
 714                 $search_query = str_replace('_LT_', '<', $search_query);
 715                 $search_query = str_replace('_PO_', '(', $search_query);
 716                 $search_query = str_replace('_PC_', ')', $search_query);
 717                 $search_query = str_replace('_LOW_', '~', $search_query);
 718                 $search_query = str_replace('_QUO_', '"', $search_query);
 719
 720                 return $search_query;
 721         }
 722
 723         public function encode_search_query($search_query)
 724         {
 725                 $search_query = str_replace('*', '_AST_', $search_query);
 726                 $search_query = str_replace('+', '_AND_', $search_query);
 727                 $search_query = str_replace('>', '_GT_', $search_query);
 728                 $search_query = str_replace('<', '_LT_', $search_query);
 729                 $search_query = str_replace('(', '_PO_', $search_query);
 730                 $search_query = str_replace(')', '_PC_', $search_query);
 731                 $search_query = str_replace('~', '_LOW_', $search_query);
 732                 $search_query = str_replace('"', '_QUO_', $search_query);
 733
 734                 $search_query = urlencode($search_query);
 735
 736                 return $search_query;
 737         }
 738
 739         /**
 740          * Return TRUE if it contains any special caracter from an advanced search
 741          * query.
 742          * @param string $search_query
 743          * @return boolean
 744          */
 745         public function is_advanced_search_query($search_query)
 746         {
 747                 return (preg_match('/\*|\+|\-|>|\<|\(|\)|~|"/', $search_query) == 0
 748                         ? FALSE : TRUE);
 749         }
 750
 751         public static function gen_activation_code()
 752         {
 753                 $ci =& get_instance();
 754
 755                 $activation_code = substr(
 756                         sha1($ci->config->item('encryption_key')
 757                                 . mt_rand()),
 758                         0,
 759                         16);
 760
 761                 return $activation_code;
 762         }
 763 }
 764
 765 /* End of file videos_model.php */
 766 /* Location: ./application/models/videos_model.php */