1<?php 2/** 3 * CodeIgniter 4 * 5 * An open source application development framework for PHP 6 * 7 * This content is released under the MIT License (MIT) 8 * 9 * Copyright (c) 2014 - 2019, British Columbia Institute of Technology 10 * 11 * Permission is hereby granted, free of charge, to any person obtaining a copy 12 * of this software and associated documentation files (the "Software"), to deal 13 * in the Software without restriction, including without limitation the rights 14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 15 * copies of the Software, and to permit persons to whom the Software is 16 * furnished to do so, subject to the following conditions: 17 * 18 * The above copyright notice and this permission notice shall be included in 19 * all copies or substantial portions of the Software. 20 * 21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 27 * THE SOFTWARE. 28 * 29 * @package CodeIgniter 30 * @author EllisLab Dev Team 31 * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/) 32 * @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/) 33 * @license https://opensource.org/licenses/MIT MIT License 34 * @link https://codeigniter.com 35 * @since Version 1.0.0 36 * @filesource 37 */ 38defined('BASEPATH') OR exit('No direct script access allowed'); 39 40/** 41 * Loader Class 42 * 43 * Loads framework components. 44 * 45 * @package CodeIgniter 46 * @subpackage Libraries 47 * @category Loader 48 * @author EllisLab Dev Team 49 * @link https://codeigniter.com/user_guide/libraries/loader.html 50 */ 51class CI_Loader { 52 53 // All these are set automatically. Don't mess with them. 54 /** 55 * Nesting level of the output buffering mechanism 56 * 57 * @var int 58 */ 59 protected $_ci_ob_level; 60 61 /** 62 * List of paths to load views from 63 * 64 * @var array 65 */ 66 protected $_ci_view_paths = array(VIEWPATH => TRUE); 67 68 /** 69 * List of paths to load libraries from 70 * 71 * @var array 72 */ 73 protected $_ci_library_paths = array(APPPATH, BASEPATH); 74 75 /** 76 * List of paths to load models from 77 * 78 * @var array 79 */ 80 protected $_ci_model_paths = array(APPPATH); 81 82 /** 83 * List of paths to load helpers from 84 * 85 * @var array 86 */ 87 protected $_ci_helper_paths = array(APPPATH, BASEPATH); 88 89 /** 90 * List of cached variables 91 * 92 * @var array 93 */ 94 protected $_ci_cached_vars = array(); 95 96 /** 97 * List of loaded classes 98 * 99 * @var array 100 */ 101 protected $_ci_classes = array(); 102 103 /** 104 * List of loaded models 105 * 106 * @var array 107 */ 108 protected $_ci_models = array(); 109 110 /** 111 * List of loaded helpers 112 * 113 * @var array 114 */ 115 protected $_ci_helpers = array(); 116 117 /** 118 * List of class name mappings 119 * 120 * @var array 121 */ 122 protected $_ci_varmap = array( 123 'unit_test' => 'unit', 124 'user_agent' => 'agent' 125 ); 126 127 // -------------------------------------------------------------------- 128 129 /** 130 * Class constructor 131 * 132 * Sets component load paths, gets the initial output buffering level. 133 * 134 * @return void 135 */ 136 public function __construct() 137 { 138 $this->_ci_ob_level = ob_get_level(); 139 $this->_ci_classes =& is_loaded(); 140 141 log_message('info', 'Loader Class Initialized'); 142 } 143 144 // -------------------------------------------------------------------- 145 146 /** 147 * Initializer 148 * 149 * @todo Figure out a way to move this to the constructor 150 * without breaking *package_path*() methods. 151 * @uses CI_Loader::_ci_autoloader() 152 * @used-by CI_Controller::__construct() 153 * @return void 154 */ 155 public function initialize() 156 { 157 $this->_ci_autoloader(); 158 } 159 160 // -------------------------------------------------------------------- 161 162 /** 163 * Is Loaded 164 * 165 * A utility method to test if a class is in the self::$_ci_classes array. 166 * 167 * @used-by Mainly used by Form Helper function _get_validation_object(). 168 * 169 * @param string $class Class name to check for 170 * @return string|bool Class object name if loaded or FALSE 171 */ 172 public function is_loaded($class) 173 { 174 return array_search(ucfirst($class), $this->_ci_classes, TRUE); 175 } 176 177 // -------------------------------------------------------------------- 178 179 /** 180 * Library Loader 181 * 182 * Loads and instantiates libraries. 183 * Designed to be called from application controllers. 184 * 185 * @param mixed $library Library name 186 * @param array $params Optional parameters to pass to the library class constructor 187 * @param string $object_name An optional object name to assign to 188 * @return object 189 */ 190 public function library($library, $params = NULL, $object_name = NULL) 191 { 192 if (empty($library)) 193 { 194 return $this; 195 } 196 elseif (is_array($library)) 197 { 198 foreach ($library as $key => $value) 199 { 200 if (is_int($key)) 201 { 202 $this->library($value, $params); 203 } 204 else 205 { 206 $this->library($key, $params, $value); 207 } 208 } 209 210 return $this; 211 } 212 213 if ($params !== NULL && ! is_array($params)) 214 { 215 $params = NULL; 216 } 217 218 $this->_ci_load_library($library, $params, $object_name); 219 return $this; 220 } 221 222 // -------------------------------------------------------------------- 223 224 /** 225 * Model Loader 226 * 227 * Loads and instantiates models. 228 * 229 * @param mixed $model Model name 230 * @param string $name An optional object name to assign to 231 * @param bool $db_conn An optional database connection configuration to initialize 232 * @return object 233 */ 234 public function model($model, $name = '', $db_conn = FALSE) 235 { 236 if (empty($model)) 237 { 238 return $this; 239 } 240 elseif (is_array($model)) 241 { 242 foreach ($model as $key => $value) 243 { 244 is_int($key) ? $this->model($value, '', $db_conn) : $this->model($key, $value, $db_conn); 245 } 246 247 return $this; 248 } 249 250 $path = ''; 251 252 // Is the model in a sub-folder? If so, parse out the filename and path. 253 if (($last_slash = strrpos($model, '/')) !== FALSE) 254 { 255 // The path is in front of the last slash 256 $path = substr($model, 0, ++$last_slash); 257 258 // And the model name behind it 259 $model = substr($model, $last_slash); 260 } 261 262 if (empty($name)) 263 { 264 $name = $model; 265 } 266 267 if (in_array($name, $this->_ci_models, TRUE)) 268 { 269 return $this; 270 } 271 272 $CI =& get_instance(); 273 if (isset($CI->$name)) 274 { 275 throw new RuntimeException('The model name you are loading is the name of a resource that is already being used: '.$name); 276 } 277 278 if ($db_conn !== FALSE && ! class_exists('CI_DB', FALSE)) 279 { 280 if ($db_conn === TRUE) 281 { 282 $db_conn = ''; 283 } 284 285 $this->database($db_conn, FALSE, TRUE); 286 } 287 288 // Note: All of the code under this condition used to be just: 289 // 290 // load_class('Model', 'core'); 291 // 292 // However, load_class() instantiates classes 293 // to cache them for later use and that prevents 294 // MY_Model from being an abstract class and is 295 // sub-optimal otherwise anyway. 296 if ( ! class_exists('CI_Model', FALSE)) 297 { 298 $app_path = APPPATH.'core'.DIRECTORY_SEPARATOR; 299 if (file_exists($app_path.'Model.php')) 300 { 301 require_once($app_path.'Model.php'); 302 if ( ! class_exists('CI_Model', FALSE)) 303 { 304 throw new RuntimeException($app_path."Model.php exists, but doesn't declare class CI_Model"); 305 } 306 307 log_message('info', 'CI_Model class loaded'); 308 } 309 elseif ( ! class_exists('CI_Model', FALSE)) 310 { 311 require_once(BASEPATH.'core'.DIRECTORY_SEPARATOR.'Model.php'); 312 } 313 314 $class = config_item('subclass_prefix').'Model'; 315 if (file_exists($app_path.$class.'.php')) 316 { 317 require_once($app_path.$class.'.php'); 318 if ( ! class_exists($class, FALSE)) 319 { 320 throw new RuntimeException($app_path.$class.".php exists, but doesn't declare class ".$class); 321 } 322 323 log_message('info', config_item('subclass_prefix').'Model class loaded'); 324 } 325 } 326 327 $model = ucfirst($model); 328 if ( ! class_exists($model, FALSE)) 329 { 330 foreach ($this->_ci_model_paths as $mod_path) 331 { 332 if ( ! file_exists($mod_path.'models/'.$path.$model.'.php')) 333 { 334 continue; 335 } 336 337 require_once($mod_path.'models/'.$path.$model.'.php'); 338 if ( ! class_exists($model, FALSE)) 339 { 340 throw new RuntimeException($mod_path."models/".$path.$model.".php exists, but doesn't declare class ".$model); 341 } 342 343 break; 344 } 345 346 if ( ! class_exists($model, FALSE)) 347 { 348 throw new RuntimeException('Unable to locate the model you have specified: '.$model); 349 } 350 } 351 elseif ( ! is_subclass_of($model, 'CI_Model')) 352 { 353 throw new RuntimeException("Class ".$model." already exists and doesn't extend CI_Model"); 354 } 355 356 $this->_ci_models[] = $name; 357 $model = new $model(); 358 $CI->$name = $model; 359 log_message('info', 'Model "'.get_class($model).'" initialized'); 360 return $this; 361 } 362 363 // -------------------------------------------------------------------- 364 365 /** 366 * Database Loader 367 * 368 * @param mixed $params Database configuration options 369 * @param bool $return Whether to return the database object 370 * @param bool $query_builder Whether to enable Query Builder 371 * (overrides the configuration setting) 372 * 373 * @return object|bool Database object if $return is set to TRUE, 374 * FALSE on failure, CI_Loader instance in any other case 375 */ 376 public function database($params = '', $return = FALSE, $query_builder = NULL) 377 { 378 // Grab the super object 379 $CI =& get_instance(); 380 381 // Do we even need to load the database class? 382 if ($return === FALSE && $query_builder === NULL && isset($CI->db) && is_object($CI->db) && ! empty($CI->db->conn_id)) 383 { 384 return FALSE; 385 } 386 387 require_once(BASEPATH.'database/DB.php'); 388 389 if ($return === TRUE) 390 { 391 return DB($params, $query_builder); 392 } 393 394 // Initialize the db variable. Needed to prevent 395 // reference errors with some configurations 396 $CI->db = ''; 397 398 // Load the DB class 399 $CI->db =& DB($params, $query_builder); 400 return $this; 401 } 402 403 // -------------------------------------------------------------------- 404 405 /** 406 * Load the Database Utilities Class 407 * 408 * @param object $db Database object 409 * @param bool $return Whether to return the DB Utilities class object or not 410 * @return object 411 */ 412 public function dbutil($db = NULL, $return = FALSE) 413 { 414 $CI =& get_instance(); 415 416 if ( ! is_object($db) OR ! ($db instanceof CI_DB)) 417 { 418 class_exists('CI_DB', FALSE) OR $this->database(); 419 $db =& $CI->db; 420 } 421 422 require_once(BASEPATH.'database/DB_utility.php'); 423 require_once(BASEPATH.'database/drivers/'.$db->dbdriver.'/'.$db->dbdriver.'_utility.php'); 424 $class = 'CI_DB_'.$db->dbdriver.'_utility'; 425 426 if ($return === TRUE) 427 { 428 return new $class($db); 429 } 430 431 $CI->dbutil = new $class($db); 432 return $this; 433 } 434 435 // -------------------------------------------------------------------- 436 437 /** 438 * Load the Database Forge Class 439 * 440 * @param object $db Database object 441 * @param bool $return Whether to return the DB Forge class object or not 442 * @return object 443 */ 444 public function dbforge($db = NULL, $return = FALSE) 445 { 446 $CI =& get_instance(); 447 if ( ! is_object($db) OR ! ($db instanceof CI_DB)) 448 { 449 class_exists('CI_DB', FALSE) OR $this->database(); 450 $db =& $CI->db; 451 } 452 453 require_once(BASEPATH.'database/DB_forge.php'); 454 require_once(BASEPATH.'database/drivers/'.$db->dbdriver.'/'.$db->dbdriver.'_forge.php'); 455 456 if ( ! empty($db->subdriver)) 457 { 458 $driver_path = BASEPATH.'database/drivers/'.$db->dbdriver.'/subdrivers/'.$db->dbdriver.'_'.$db->subdriver.'_forge.php'; 459 if (file_exists($driver_path)) 460 { 461 require_once($driver_path); 462 $class = 'CI_DB_'.$db->dbdriver.'_'.$db->subdriver.'_forge'; 463 } 464 } 465 else 466 { 467 $class = 'CI_DB_'.$db->dbdriver.'_forge'; 468 } 469 470 if ($return === TRUE) 471 { 472 return new $class($db); 473 } 474 475 $CI->dbforge = new $class($db); 476 return $this; 477 } 478 479 // -------------------------------------------------------------------- 480 481 /** 482 * View Loader 483 * 484 * Loads "view" files. 485 * 486 * @param string $view View name 487 * @param array $vars An associative array of data 488 * to be extracted for use in the view 489 * @param bool $return Whether to return the view output 490 * or leave it to the Output class 491 * @return object|string 492 */ 493 public function view($view, $vars = array(), $return = FALSE) 494 { 495 return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_prepare_view_vars($vars), '_ci_return' => $return)); 496 } 497 498 // -------------------------------------------------------------------- 499 500 /** 501 * Generic File Loader 502 * 503 * @param string $path File path 504 * @param bool $return Whether to return the file output 505 * @return object|string 506 */ 507 public function file($path, $return = FALSE) 508 { 509 return $this->_ci_load(array('_ci_path' => $path, '_ci_return' => $return)); 510 } 511 512 // -------------------------------------------------------------------- 513 514 /** 515 * Set Variables 516 * 517 * Once variables are set they become available within 518 * the controller class and its "view" files. 519 * 520 * @param array|object|string $vars 521 * An associative array or object containing values 522 * to be set, or a value's name if string 523 * @param string $val Value to set, only used if $vars is a string 524 * @return object 525 */ 526 public function vars($vars, $val = '') 527 { 528 $vars = is_string($vars) 529 ? array($vars => $val) 530 : $this->_ci_prepare_view_vars($vars); 531 532 foreach ($vars as $key => $val) 533 { 534 $this->_ci_cached_vars[$key] = $val; 535 } 536 537 return $this; 538 } 539 540 // -------------------------------------------------------------------- 541 542 /** 543 * Clear Cached Variables 544 * 545 * Clears the cached variables. 546 * 547 * @return CI_Loader 548 */ 549 public function clear_vars() 550 { 551 $this->_ci_cached_vars = array(); 552 return $this; 553 } 554 555 // -------------------------------------------------------------------- 556 557 /** 558 * Get Variable 559 * 560 * Check if a variable is set and retrieve it. 561 * 562 * @param string $key Variable name 563 * @return mixed The variable or NULL if not found 564 */ 565 public function get_var($key) 566 { 567 return isset($this->_ci_cached_vars[$key]) ? $this->_ci_cached_vars[$key] : NULL; 568 } 569 570 // -------------------------------------------------------------------- 571 572 /** 573 * Get Variables 574 * 575 * Retrieves all loaded variables. 576 * 577 * @return array 578 */ 579 public function get_vars() 580 { 581 return $this->_ci_cached_vars; 582 } 583 584 // -------------------------------------------------------------------- 585 586 /** 587 * Helper Loader 588 * 589 * @param string|string[] $helpers Helper name(s) 590 * @return object 591 */ 592 public function helper($helpers = array()) 593 { 594 is_array($helpers) OR $helpers = array($helpers); 595 foreach ($helpers as &$helper) 596 { 597 $filename = basename($helper); 598 $filepath = ($filename === $helper) ? '' : substr($helper, 0, strlen($helper) - strlen($filename)); 599 $filename = strtolower(preg_replace('#(_helper)?(\.php)?$#i', '', $filename)).'_helper'; 600 $helper = $filepath.$filename; 601 602 if (isset($this->_ci_helpers[$helper])) 603 { 604 continue; 605 } 606 607 // Is this a helper extension request? 608 $ext_helper = config_item('subclass_prefix').$filename; 609 $ext_loaded = FALSE; 610 foreach ($this->_ci_helper_paths as $path) 611 { 612 if (file_exists($path.'helpers/'.$ext_helper.'.php')) 613 { 614 include_once($path.'helpers/'.$ext_helper.'.php'); 615 $ext_loaded = TRUE; 616 } 617 } 618 619 // If we have loaded extensions - check if the base one is here 620 if ($ext_loaded === TRUE) 621 { 622 $base_helper = BASEPATH.'helpers/'.$helper.'.php'; 623 if ( ! file_exists($base_helper)) 624 { 625 show_error('Unable to load the requested file: helpers/'.$helper.'.php'); 626 } 627 628 include_once($base_helper); 629 $this->_ci_helpers[$helper] = TRUE; 630 log_message('info', 'Helper loaded: '.$helper); 631 continue; 632 } 633 634 // No extensions found ... try loading regular helpers and/or overrides 635 foreach ($this->_ci_helper_paths as $path) 636 { 637 if (file_exists($path.'helpers/'.$helper.'.php')) 638 { 639 include_once($path.'helpers/'.$helper.'.php'); 640 641 $this->_ci_helpers[$helper] = TRUE; 642 log_message('info', 'Helper loaded: '.$helper); 643 break; 644 } 645 } 646 647 // unable to load the helper 648 if ( ! isset($this->_ci_helpers[$helper])) 649 { 650 show_error('Unable to load the requested file: helpers/'.$helper.'.php'); 651 } 652 } 653 654 return $this; 655 } 656 657 // -------------------------------------------------------------------- 658 659 /** 660 * Load Helpers 661 * 662 * An alias for the helper() method in case the developer has 663 * written the plural form of it. 664 * 665 * @uses CI_Loader::helper() 666 * @param string|string[] $helpers Helper name(s) 667 * @return object 668 */ 669 public function helpers($helpers = array()) 670 { 671 return $this->helper($helpers); 672 } 673 674 // -------------------------------------------------------------------- 675 676 /** 677 * Language Loader 678 * 679 * Loads language files. 680 * 681 * @param string|string[] $files List of language file names to load 682 * @param string Language name 683 * @return object 684 */ 685 public function language($files, $lang = '') 686 { 687 get_instance()->lang->load($files, $lang); 688 return $this; 689 } 690 691 // -------------------------------------------------------------------- 692 693 /** 694 * Config Loader 695 * 696 * Loads a config file (an alias for CI_Config::load()). 697 * 698 * @uses CI_Config::load() 699 * @param string $file Configuration file name 700 * @param bool $use_sections Whether configuration values should be loaded into their own section 701 * @param bool $fail_gracefully Whether to just return FALSE or display an error message 702 * @return bool TRUE if the file was loaded correctly or FALSE on failure 703 */ 704 public function config($file, $use_sections = FALSE, $fail_gracefully = FALSE) 705 { 706 return get_instance()->config->load($file, $use_sections, $fail_gracefully); 707 } 708 709 // -------------------------------------------------------------------- 710 711 /** 712 * Driver Loader 713 * 714 * Loads a driver library. 715 * 716 * @param string|string[] $library Driver name(s) 717 * @param array $params Optional parameters to pass to the driver 718 * @param string $object_name An optional object name to assign to 719 * 720 * @return object|bool Object or FALSE on failure if $library is a string 721 * and $object_name is set. CI_Loader instance otherwise. 722 */ 723 public function driver($library, $params = NULL, $object_name = NULL) 724 { 725 if (is_array($library)) 726 { 727 foreach ($library as $key => $value) 728 { 729 if (is_int($key)) 730 { 731 $this->driver($value, $params); 732 } 733 else 734 { 735 $this->driver($key, $params, $value); 736 } 737 } 738 739 return $this; 740 } 741 elseif (empty($library)) 742 { 743 return FALSE; 744 } 745 746 if ( ! class_exists('CI_Driver_Library', FALSE)) 747 { 748 // We aren't instantiating an object here, just making the base class available 749 require BASEPATH.'libraries/Driver.php'; 750 } 751 752 // We can save the loader some time since Drivers will *always* be in a subfolder, 753 // and typically identically named to the library 754 if ( ! strpos($library, '/')) 755 { 756 $library = ucfirst($library).'/'.$library; 757 } 758 759 return $this->library($library, $params, $object_name); 760 } 761 762 // -------------------------------------------------------------------- 763 764 /** 765 * Add Package Path 766 * 767 * Prepends a parent path to the library, model, helper and config 768 * path arrays. 769 * 770 * @see CI_Loader::$_ci_library_paths 771 * @see CI_Loader::$_ci_model_paths 772 * @see CI_Loader::$_ci_helper_paths 773 * @see CI_Config::$_config_paths 774 * 775 * @param string $path Path to add 776 * @param bool $view_cascade (default: TRUE) 777 * @return object 778 */ 779 public function add_package_path($path, $view_cascade = TRUE) 780 { 781 $path = rtrim($path, '/').'/'; 782 783 array_unshift($this->_ci_library_paths, $path); 784 array_unshift($this->_ci_model_paths, $path); 785 array_unshift($this->_ci_helper_paths, $path); 786 787 $this->_ci_view_paths = array($path.'views/' => $view_cascade) + $this->_ci_view_paths; 788 789 // Add config file path 790 $config =& $this->_ci_get_component('config'); 791 $config->_config_paths[] = $path; 792 793 return $this; 794 } 795 796 // -------------------------------------------------------------------- 797 798 /** 799 * Get Package Paths 800 * 801 * Return a list of all package paths. 802 * 803 * @param bool $include_base Whether to include BASEPATH (default: FALSE) 804 * @return array 805 */ 806 public function get_package_paths($include_base = FALSE) 807 { 808 return ($include_base === TRUE) ? $this->_ci_library_paths : $this->_ci_model_paths; 809 } 810 811 // -------------------------------------------------------------------- 812 813 /** 814 * Remove Package Path 815 * 816 * Remove a path from the library, model, helper and/or config 817 * path arrays if it exists. If no path is provided, the most recently 818 * added path will be removed removed. 819 * 820 * @param string $path Path to remove 821 * @return object 822 */ 823 public function remove_package_path($path = '') 824 { 825 $config =& $this->_ci_get_component('config'); 826 827 if ($path === '') 828 { 829 array_shift($this->_ci_library_paths); 830 array_shift($this->_ci_model_paths); 831 array_shift($this->_ci_helper_paths); 832 array_shift($this->_ci_view_paths); 833 array_pop($config->_config_paths); 834 } 835 else 836 { 837 $path = rtrim($path, '/').'/'; 838 foreach (array('_ci_library_paths', '_ci_model_paths', '_ci_helper_paths') as $var) 839 { 840 if (($key = array_search($path, $this->{$var})) !== FALSE) 841 { 842 unset($this->{$var}[$key]); 843 } 844 } 845 846 if (isset($this->_ci_view_paths[$path.'views/'])) 847 { 848 unset($this->_ci_view_paths[$path.'views/']); 849 } 850 851 if (($key = array_search($path, $config->_config_paths)) !== FALSE) 852 { 853 unset($config->_config_paths[$key]); 854 } 855 } 856 857 // make sure the application default paths are still in the array 858 $this->_ci_library_paths = array_unique(array_merge($this->_ci_library_paths, array(APPPATH, BASEPATH))); 859 $this->_ci_helper_paths = array_unique(array_merge($this->_ci_helper_paths, array(APPPATH, BASEPATH))); 860 $this->_ci_model_paths = array_unique(array_merge($this->_ci_model_paths, array(APPPATH))); 861 $this->_ci_view_paths = array_merge($this->_ci_view_paths, array(APPPATH.'views/' => TRUE)); 862 $config->_config_paths = array_unique(array_merge($config->_config_paths, array(APPPATH))); 863 864 return $this; 865 } 866 867 // -------------------------------------------------------------------- 868 869 /** 870 * Internal CI Data Loader 871 * 872 * Used to load views and files. 873 * 874 * Variables are prefixed with _ci_ to avoid symbol collision with 875 * variables made available to view files. 876 * 877 * @used-by CI_Loader::view() 878 * @used-by CI_Loader::file() 879 * @param array $_ci_data Data to load 880 * @return object 881 */ 882 protected function _ci_load($_ci_data) 883 { 884 // Set the default data variables 885 foreach (array('_ci_view', '_ci_vars', '_ci_path', '_ci_return') as $_ci_val) 886 { 887 $$_ci_val = isset($_ci_data[$_ci_val]) ? $_ci_data[$_ci_val] : FALSE; 888 } 889 890 $file_exists = FALSE; 891 892 // Set the path to the requested file 893 if (is_string($_ci_path) && $_ci_path !== '') 894 { 895 $_ci_x = explode('/', $_ci_path); 896 $_ci_file = end($_ci_x); 897 } 898 else 899 { 900 $_ci_ext = pathinfo($_ci_view, PATHINFO_EXTENSION); 901 $_ci_file = ($_ci_ext === '') ? $_ci_view.'.php' : $_ci_view; 902 903 foreach ($this->_ci_view_paths as $_ci_view_file => $cascade) 904 { 905 if (file_exists($_ci_view_file.$_ci_file)) 906 { 907 $_ci_path = $_ci_view_file.$_ci_file; 908 $file_exists = TRUE; 909 break; 910 } 911 912 if ( ! $cascade) 913 { 914 break; 915 } 916 } 917 } 918 919 if ( ! $file_exists && ! file_exists($_ci_path)) 920 { 921 show_error('Unable to load the requested file: '.$_ci_file); 922 } 923 924 // This allows anything loaded using $this->load (views, files, etc.) 925 // to become accessible from within the Controller and Model functions. 926 $_ci_CI =& get_instance(); 927 foreach (get_object_vars($_ci_CI) as $_ci_key => $_ci_var) 928 { 929 if ( ! isset($this->$_ci_key)) 930 { 931 $this->$_ci_key =& $_ci_CI->$_ci_key; 932 } 933 } 934 935 /* 936 * Extract and cache variables 937 * 938 * You can either set variables using the dedicated $this->load->vars() 939 * function or via the second parameter of this function. We'll merge 940 * the two types and cache them so that views that are embedded within 941 * other views can have access to these variables. 942 */ 943 empty($_ci_vars) OR $this->_ci_cached_vars = array_merge($this->_ci_cached_vars, $_ci_vars); 944 extract($this->_ci_cached_vars); 945 946 /* 947 * Buffer the output 948 * 949 * We buffer the output for two reasons: 950 * 1. Speed. You get a significant speed boost. 951 * 2. So that the final rendered template can be post-processed by 952 * the output class. Why do we need post processing? For one thing, 953 * in order to show the elapsed page load time. Unless we can 954 * intercept the content right before it's sent to the browser and 955 * then stop the timer it won't be accurate. 956 */ 957 ob_start(); 958 959 // If the PHP installation does not support short tags we'll 960 // do a little string replacement, changing the short tags 961 // to standard PHP echo statements. 962 if ( ! is_php('5.4') && ! ini_get('short_open_tag') && config_item('rewrite_short_tags') === TRUE) 963 { 964 echo eval('?>'.preg_replace('/;*\s*\?>/', '; ?>', str_replace('<?=', '<?php echo ', file_get_contents($_ci_path)))); 965 } 966 else 967 { 968 include($_ci_path); // include() vs include_once() allows for multiple views with the same name 969 } 970 971 log_message('info', 'File loaded: '.$_ci_path); 972 973 // Return the file data if requested 974 if ($_ci_return === TRUE) 975 { 976 $buffer = ob_get_contents(); 977 @ob_end_clean(); 978 return $buffer; 979 } 980 981 /* 982 * Flush the buffer... or buff the flusher? 983 * 984 * In order to permit views to be nested within 985 * other views, we need to flush the content back out whenever 986 * we are beyond the first level of output buffering so that 987 * it can be seen and included properly by the first included 988 * template and any subsequent ones. Oy! 989 */ 990 if (ob_get_level() > $this->_ci_ob_level + 1) 991 { 992 ob_end_flush(); 993 } 994 else 995 { 996 $_ci_CI->output->append_output(ob_get_contents()); 997 @ob_end_clean(); 998 } 999 1000 return $this; 1001 } 1002 1003 // -------------------------------------------------------------------- 1004 1005 /** 1006 * Internal CI Library Loader 1007 * 1008 * @used-by CI_Loader::library() 1009 * @uses CI_Loader::_ci_init_library() 1010 * 1011 * @param string $class Class name to load 1012 * @param mixed $params Optional parameters to pass to the class constructor 1013 * @param string $object_name Optional object name to assign to 1014 * @return void 1015 */ 1016 protected function _ci_load_library($class, $params = NULL, $object_name = NULL) 1017 { 1018 // Get the class name, and while we're at it trim any slashes. 1019 // The directory path can be included as part of the class name, 1020 // but we don't want a leading slash 1021 $class = str_replace('.php', '', trim($class, '/')); 1022 1023 // Was the path included with the class name? 1024 // We look for a slash to determine this 1025 if (($last_slash = strrpos($class, '/')) !== FALSE) 1026 { 1027 // Extract the path 1028 $subdir = substr($class, 0, ++$last_slash); 1029 1030 // Get the filename from the path 1031 $class = substr($class, $last_slash); 1032 } 1033 else 1034 { 1035 $subdir = ''; 1036 } 1037 1038 $class = ucfirst($class); 1039 1040 // Is this a stock library? There are a few special conditions if so ... 1041 if (file_exists(BASEPATH.'libraries/'.$subdir.$class.'.php')) 1042 { 1043 return $this->_ci_load_stock_library($class, $subdir, $params, $object_name); 1044 } 1045 1046 // Safety: Was the class already loaded by a previous call? 1047 if (class_exists($class, FALSE)) 1048 { 1049 $property = $object_name; 1050 if (empty($property)) 1051 { 1052 $property = strtolower($class); 1053 isset($this->_ci_varmap[$property]) && $property = $this->_ci_varmap[$property]; 1054 } 1055 1056 $CI =& get_instance(); 1057 if (isset($CI->$property)) 1058 { 1059 log_message('debug', $class.' class already loaded. Second attempt ignored.'); 1060 return; 1061 } 1062 1063 return $this->_ci_init_library($class, '', $params, $object_name); 1064 } 1065 1066 // Let's search for the requested library file and load it. 1067 foreach ($this->_ci_library_paths as $path) 1068 { 1069 // BASEPATH has already been checked for 1070 if ($path === BASEPATH) 1071 { 1072 continue; 1073 } 1074 1075 $filepath = $path.'libraries/'.$subdir.$class.'.php'; 1076 // Does the file exist? No? Bummer... 1077 if ( ! file_exists($filepath)) 1078 { 1079 continue; 1080 } 1081 1082 include_once($filepath); 1083 return $this->_ci_init_library($class, '', $params, $object_name); 1084 } 1085 1086 // One last attempt. Maybe the library is in a subdirectory, but it wasn't specified? 1087 if ($subdir === '') 1088 { 1089 return $this->_ci_load_library($class.'/'.$class, $params, $object_name); 1090 } 1091 1092 // If we got this far we were unable to find the requested class. 1093 log_message('error', 'Unable to load the requested class: '.$class); 1094 show_error('Unable to load the requested class: '.$class); 1095 } 1096 1097 // -------------------------------------------------------------------- 1098 1099 /** 1100 * Internal CI Stock Library Loader 1101 * 1102 * @used-by CI_Loader::_ci_load_library() 1103 * @uses CI_Loader::_ci_init_library() 1104 * 1105 * @param string $library_name Library name to load 1106 * @param string $file_path Path to the library filename, relative to libraries/ 1107 * @param mixed $params Optional parameters to pass to the class constructor 1108 * @param string $object_name Optional object name to assign to 1109 * @return void 1110 */ 1111 protected function _ci_load_stock_library($library_name, $file_path, $params, $object_name) 1112 { 1113 $prefix = 'CI_'; 1114 1115 if (class_exists($prefix.$library_name, FALSE)) 1116 { 1117 if (class_exists(config_item('subclass_prefix').$library_name, FALSE)) 1118 { 1119 $prefix = config_item('subclass_prefix'); 1120 } 1121 1122 $property = $object_name; 1123 if (empty($property)) 1124 { 1125 $property = strtolower($library_name); 1126 isset($this->_ci_varmap[$property]) && $property = $this->_ci_varmap[$property]; 1127 } 1128 1129 $CI =& get_instance(); 1130 if ( ! isset($CI->$property)) 1131 { 1132 return $this->_ci_init_library($library_name, $prefix, $params, $object_name); 1133 } 1134 1135 log_message('debug', $library_name.' class already loaded. Second attempt ignored.'); 1136 return; 1137 } 1138 1139 $paths = $this->_ci_library_paths; 1140 array_pop($paths); // BASEPATH 1141 array_pop($paths); // APPPATH (needs to be the first path checked) 1142 array_unshift($paths, APPPATH); 1143 1144 foreach ($paths as $path) 1145 { 1146 if (file_exists($path = $path.'libraries/'.$file_path.$library_name.'.php')) 1147 { 1148 // Override 1149 include_once($path); 1150 if (class_exists($prefix.$library_name, FALSE)) 1151 { 1152 return $this->_ci_init_library($library_name, $prefix, $params, $object_name); 1153 } 1154 1155 log_message('debug', $path.' exists, but does not declare '.$prefix.$library_name); 1156 } 1157 } 1158 1159 include_once(BASEPATH.'libraries/'.$file_path.$library_name.'.php'); 1160 1161 // Check for extensions 1162 $subclass = config_item('subclass_prefix').$library_name; 1163 foreach ($paths as $path) 1164 { 1165 if (file_exists($path = $path.'libraries/'.$file_path.$subclass.'.php')) 1166 { 1167 include_once($path); 1168 if (class_exists($subclass, FALSE)) 1169 { 1170 $prefix = config_item('subclass_prefix'); 1171 break; 1172 } 1173 1174 log_message('debug', $path.' exists, but does not declare '.$subclass); 1175 } 1176 } 1177 1178 return $this->_ci_init_library($library_name, $prefix, $params, $object_name); 1179 } 1180 1181 // -------------------------------------------------------------------- 1182 1183 /** 1184 * Internal CI Library Instantiator 1185 * 1186 * @used-by CI_Loader::_ci_load_stock_library() 1187 * @used-by CI_Loader::_ci_load_library() 1188 * 1189 * @param string $class Class name 1190 * @param string $prefix Class name prefix 1191 * @param array|null|bool $config Optional configuration to pass to the class constructor: 1192 * FALSE to skip; 1193 * NULL to search in config paths; 1194 * array containing configuration data 1195 * @param string $object_name Optional object name to assign to 1196 * @return void 1197 */ 1198 protected function _ci_init_library($class, $prefix, $config = FALSE, $object_name = NULL) 1199 { 1200 // Is there an associated config file for this class? Note: these should always be lowercase 1201 if ($config === NULL) 1202 { 1203 // Fetch the config paths containing any package paths 1204 $config_component = $this->_ci_get_component('config'); 1205 1206 if (is_array($config_component->_config_paths)) 1207 { 1208 $found = FALSE; 1209 foreach ($config_component->_config_paths as $path) 1210 { 1211 // We test for both uppercase and lowercase, for servers that 1212 // are case-sensitive with regard to file names. Load global first, 1213 // override with environment next 1214 if (file_exists($path.'config/'.strtolower($class).'.php')) 1215 { 1216 include($path.'config/'.strtolower($class).'.php'); 1217 $found = TRUE; 1218 } 1219 elseif (file_exists($path.'config/'.ucfirst(strtolower($class)).'.php')) 1220 { 1221 include($path.'config/'.ucfirst(strtolower($class)).'.php'); 1222 $found = TRUE; 1223 } 1224 1225 if (file_exists($path.'config/'.ENVIRONMENT.'/'.strtolower($class).'.php')) 1226 { 1227 include($path.'config/'.ENVIRONMENT.'/'.strtolower($class).'.php'); 1228 $found = TRUE; 1229 } 1230 elseif (file_exists($path.'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php')) 1231 { 1232 include($path.'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php'); 1233 $found = TRUE; 1234 } 1235 1236 // Break on the first found configuration, thus package 1237 // files are not overridden by default paths 1238 if ($found === TRUE) 1239 { 1240 break; 1241 } 1242 } 1243 } 1244 } 1245 1246 $class_name = $prefix.$class; 1247 1248 // Is the class name valid? 1249 if ( ! class_exists($class_name, FALSE)) 1250 { 1251 log_message('error', 'Non-existent class: '.$class_name); 1252 show_error('Non-existent class: '.$class_name); 1253 } 1254 1255 // Set the variable name we will assign the class to 1256 // Was a custom class name supplied? If so we'll use it 1257 if (empty($object_name)) 1258 { 1259 $object_name = strtolower($class); 1260 if (isset($this->_ci_varmap[$object_name])) 1261 { 1262 $object_name = $this->_ci_varmap[$object_name]; 1263 } 1264 } 1265 1266 // Don't overwrite existing properties 1267 $CI =& get_instance(); 1268 if (isset($CI->$object_name)) 1269 { 1270 if ($CI->$object_name instanceof $class_name) 1271 { 1272 log_message('debug', $class_name." has already been instantiated as '".$object_name."'. Second attempt aborted."); 1273 return; 1274 } 1275 1276 show_error("Resource '".$object_name."' already exists and is not a ".$class_name." instance."); 1277 } 1278 1279 // Save the class name and object name 1280 $this->_ci_classes[$object_name] = $class; 1281 1282 // Instantiate the class 1283 $CI->$object_name = isset($config) 1284 ? new $class_name($config) 1285 : new $class_name(); 1286 } 1287 1288 // -------------------------------------------------------------------- 1289 1290 /** 1291 * CI Autoloader 1292 * 1293 * Loads component listed in the config/autoload.php file. 1294 * 1295 * @used-by CI_Loader::initialize() 1296 * @return void 1297 */ 1298 protected function _ci_autoloader() 1299 { 1300 if (file_exists(APPPATH.'config/autoload.php')) 1301 { 1302 include(APPPATH.'config/autoload.php'); 1303 } 1304 1305 if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/autoload.php')) 1306 { 1307 include(APPPATH.'config/'.ENVIRONMENT.'/autoload.php'); 1308 } 1309 1310 if ( ! isset($autoload)) 1311 { 1312 return; 1313 } 1314 1315 // Autoload packages 1316 if (isset($autoload['packages'])) 1317 { 1318 foreach ($autoload['packages'] as $package_path) 1319 { 1320 $this->add_package_path($package_path); 1321 } 1322 } 1323 1324 // Load any custom config file 1325 if (count($autoload['config']) > 0) 1326 { 1327 foreach ($autoload['config'] as $val) 1328 { 1329 $this->config($val); 1330 } 1331 } 1332 1333 // Autoload helpers and languages 1334 foreach (array('helper', 'language') as $type) 1335 { 1336 if (isset($autoload[$type]) && count($autoload[$type]) > 0) 1337 { 1338 $this->$type($autoload[$type]); 1339 } 1340 } 1341 1342 // Autoload drivers 1343 if (isset($autoload['drivers'])) 1344 { 1345 $this->driver($autoload['drivers']); 1346 } 1347 1348 // Load libraries 1349 if (isset($autoload['libraries']) && count($autoload['libraries']) > 0) 1350 { 1351 // Load the database driver. 1352 if (in_array('database', $autoload['libraries'])) 1353 { 1354 $this->database(); 1355 $autoload['libraries'] = array_diff($autoload['libraries'], array('database')); 1356 } 1357 1358 // Load all other libraries 1359 $this->library($autoload['libraries']); 1360 } 1361 1362 // Autoload models 1363 if (isset($autoload['model'])) 1364 { 1365 $this->model($autoload['model']); 1366 } 1367 } 1368 1369 // -------------------------------------------------------------------- 1370 1371 /** 1372 * Prepare variables for _ci_vars, to be later extract()-ed inside views 1373 * 1374 * Converts objects to associative arrays and filters-out internal 1375 * variable names (i.e. keys prefixed with '_ci_'). 1376 * 1377 * @param mixed $vars 1378 * @return array 1379 */ 1380 protected function _ci_prepare_view_vars($vars) 1381 { 1382 if ( ! is_array($vars)) 1383 { 1384 $vars = is_object($vars) 1385 ? get_object_vars($vars) 1386 : array(); 1387 } 1388 1389 foreach (array_keys($vars) as $key) 1390 { 1391 if (strncmp($key, '_ci_', 4) === 0) 1392 { 1393 unset($vars[$key]); 1394 } 1395 } 1396 1397 return $vars; 1398 } 1399 1400 // -------------------------------------------------------------------- 1401 1402 /** 1403 * CI Component getter 1404 * 1405 * Get a reference to a specific library or model. 1406 * 1407 * @param string $component Component name 1408 * @return bool 1409 */ 1410 protected function &_ci_get_component($component) 1411 { 1412 $CI =& get_instance(); 1413 return $CI->$component; 1414 } 1415} 1416