milionkostek /system/core/Kohana.php

Language PHP Lines 1481
MD5 Hash 01dd54559b1a7980622b6132f58205fc Estimated Cost $21,935 (why?)
Repository https://github.com/MHordecki/milionkostek.git View Raw File View Project SPDX
   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
<?php defined('SYSPATH') or die('No direct script access.');
/**
 * Provides Kohana-specific helper functions. This is where the magic happens!
 *
 * $Id: Kohana.php 2833 2008-06-12 08:18:12Z dlib $
 *
 * @package    Core
 * @author     Kohana Team
 * @copyright  (c) 2007-2008 Kohana Team
 * @license    http://kohanaphp.com/license.html
 */
class Kohana {

	// The singleton instance of the controller
	public static $instance;

	// Output buffering level
	private static $buffer_level = 0;

	// Will be set to TRUE when an exception is caught
	public static $has_error = FALSE;

	// The final output that will displayed by Kohana
	public static $output = '';

	// The current user agent
	public static $user_agent = '';

	// File path cache
	private static $paths;
	private static $paths_changed = FALSE;

	/**
	 * Sets up the PHP environment. Adds error/exception handling, output
	 * buffering, and adds an auto-loading method for loading classes.
	 *
	 * This method is run immediately when this file is loaded, and is
	 * benchmarked as environment_setup.
	 *
	 * For security, this function also destroys the $_REQUEST global variable.
	 * Using the proper global (GET, POST, COOKIE, etc) is inherently more secure.
	 * The recommended way to fetch a global variable is using the Input library.
	 * @see http://www.php.net/globals
	 *
	 * @return  void
	 */
	final public static function setup()
	{
		static $run;

		// This function can only be run once
		if ($run === TRUE)
			return;

		// Start the environment setup benchmark
		Benchmark::start(SYSTEM_BENCHMARK.'_environment_setup');

		// Define Kohana error constant
		defined('E_KOHANA') or define('E_KOHANA', 42);

		// Define 404 error constant
		defined('E_PAGE_NOT_FOUND') or define('E_PAGE_NOT_FOUND', 43);

		// Define database error constant
		defined('E_DATABASE_ERROR') or define('E_DATABASE_ERROR', 44);

		// Disable error reporting
		$ER = error_reporting(0);

		// Set the user agent
		self::$user_agent = trim($_SERVER['HTTP_USER_AGENT']);

		if (function_exists('date_default_timezone_set'))
		{
			$timezone = Config::item('locale.timezone');

			// Set default timezone, due to increased validation of date settings
			// which cause massive amounts of E_NOTICEs to be generated in PHP 5.2+
			date_default_timezone_set(empty($timezone) ? date_default_timezone_get() : $timezone);
		}

		// Restore error reporting
		error_reporting($ER);

		// Start output buffering
		ob_start(array('Kohana', 'output_buffer'));

		// Save buffering level
		self::$buffer_level = ob_get_level();

		// Load path cache
		self::$paths = Kohana::load_cache('file_paths');

		// Set autoloader
		spl_autoload_register(array('Kohana', 'auto_load'));

		// Set error handler
		set_error_handler(array('Kohana', 'exception_handler'));

		// Set exception handler
		set_exception_handler(array('Kohana', 'exception_handler'));

		// Disable magic_quotes_runtime. The Input library takes care of
		// magic_quotes_gpc later.
		set_magic_quotes_runtime(0);

		// Send default text/html UTF-8 header
		header('Content-type: text/html; charset=UTF-8');

		// Set locale information
		setlocale(LC_ALL, Config::item('locale.language').'.UTF-8');

		if (Config::item('log.threshold') > 0)
		{
			// Get the configured log directory
			$log_dir = Config::item('log.directory');

			if ( ! is_dir($log_dir))
			{
				// Application log directory
				$log_dir = APPPATH.$log_dir;
			}

			// Set the log directory
			Log::directory($log_dir);

			// Enable log writing if the log threshold is above 0
			register_shutdown_function(array('Log', 'write'));
		}

		// Enable Kohana routing
		Event::add('system.routing', array('Router', 'find_uri'));
		Event::add('system.routing', array('Router', 'setup'));

		// Enable Kohana controller initialization
		Event::add('system.execute', array('Kohana', 'instance'));

		// Enable Kohana 404 pages
		Event::add('system.404', array('Kohana', 'show_404'));

		// Enable Kohana output handling
		Event::add('system.shutdown', array('Kohana', 'shutdown'));

		if ($config = Config::item('hooks.enable'))
		{
			$hooks = array();

			if ( ! is_array($config))
			{
				// All of the hooks are enabled, so we use list_files
				$hooks = Kohana::list_files('hooks', TRUE);
			}
			else
			{
				// Individual hooks need to be found
				foreach ($config as $name)
				{
					if ($hook = Kohana::find_file('hooks', $name, FALSE))
					{
						// Hook was found, add it to loaded hooks
						$hooks[] = $hook;
					}
					else
					{
						// This should never happen
						Log::add('error', 'Hook not found: '.$name);
					}
				}
			}

			// Length of extension, for offset
			$ext = -(strlen(EXT));

			foreach ($hooks as $hook)
			{
				// Validate the filename extension
				if (substr($hook, $ext) === EXT)
				{
					// Hook was found, include it
					include $hook;
				}
				else
				{
					// This should never happen
					Log::add('error', 'Hook not found: '.$hook);
				}
			}
		}

		// Setup is complete, prevent it from being run again
		$run = TRUE;

		// Stop the environment setup routine
		Benchmark::stop(SYSTEM_BENCHMARK.'_environment_setup');
	}

	/**
	 * Loads the controller and initializes it. Runs the pre_controller,
	 * post_controller_constructor, and post_controller events. Triggers
	 * a system.404 event when the route cannot be mapped to a controller.
	 *
	 * This method is benchmarked as controller_setup and controller_execution.
	 *
	 * @return  object  instance of controller
	 */
	final public static function & instance()
	{
		if (self::$instance === NULL)
		{
			Benchmark::start(SYSTEM_BENCHMARK.'_controller_setup');

			// Include the Controller file
			require Router::$directory.Router::$controller.EXT;

			// Set controller class name
			$controller = ucfirst(Router::$controller).'_Controller';

			// Make sure the controller class exists
			class_exists($controller, FALSE) or Event::run('system.404');

			// Production enviroment protection, based on the IN_PRODUCTION flag
			(IN_PRODUCTION AND constant($controller.'::ALLOW_PRODUCTION') === FALSE) and Event::run('system.404');

			// Run system.pre_controller
			Event::run('system.pre_controller');

			// Get the controller methods
			$methods = array_flip(get_class_methods($controller));

			if (isset($methods['_remap']))
			{
				// Make the arguments routed
				$arguments = array(Router::$method, Router::$arguments);

				// The method becomes part of the arguments
				array_unshift(Router::$arguments, Router::$method);

				// Set the method to _remap
				Router::$method = '_remap';
			}
			elseif (isset($methods[Router::$method]) AND Router::$method[0] !== '_')
			{
				// Use the arguments normally
				$arguments = Router::$arguments;
			}
			elseif (isset($methods['_default']))
			{
				// Make the arguments routed
				$arguments = array(Router::$method, Router::$arguments);

				// The method becomes part of the arguments
				array_unshift(Router::$arguments, Router::$method);

				// Set the method to _default
				Router::$method = '_default';
			}
			else
			{
				// Method was not found, run the system.404 event
				Event::run('system.404');
			}

			// Initialize the controller
			$controller = new $controller;

			// Run system.post_controller_constructor
			Event::run('system.post_controller_constructor');
			
			// Controller method name, used for calling
			$method = Router::$method;

			// Stop the controller setup benchmark
			Benchmark::stop(SYSTEM_BENCHMARK.'_controller_setup');

			// Start the controller execution benchmark
			Benchmark::start(SYSTEM_BENCHMARK.'_controller_execution');

			if (empty($arguments))
			{
				// Call the controller method with no arguments
				$controller->$method();
			}
			else
			{
				// Manually call the controller for up to 4 arguments, to increase performance
				switch (count($arguments))
				{
					case 1:
						$controller->$method($arguments[0]);
					break;
					case 2:
						$controller->$method($arguments[0], $arguments[1]);
					break;
					case 3:
						$controller->$method($arguments[0], $arguments[1], $arguments[2]);
					break;
					case 4:
						$controller->$method($arguments[0], $arguments[1], $arguments[2], $arguments[3]);
					break;
					default:
						// Resort to using call_user_func_array for many segments
						call_user_func_array(array($controller, $method), $arguments);
					break;
				}
			}

			// Run system.post_controller
			Event::run('system.post_controller');

			// Stop the controller execution benchmark
			Benchmark::stop(SYSTEM_BENCHMARK.'_controller_execution');
		}

		return self::$instance;
	}

	/**
	 * Kohana output handler.
	 *
	 * @param   string  current output buffer
	 * @return  string
	 */
	final public static function output_buffer($output)
	{
		// Run the send_headers event, specifically for cookies being set
		Event::has_run('system.send_headers') or Event::run('system.send_headers');

		// Set final output
		self::$output = $output;

		// Set and return the final output
		return $output;
	}

	/**
	 * Triggers the shutdown of Kohana by closing the output buffer, runs the system.display event.
	 *
	 * @return  void
	 */
	public static function shutdown()
	{
		while (ob_get_level() > self::$buffer_level)
		{
			// Flush all open output buffers above the internal buffer
			ob_end_flush();
		}

		// This will flush the Kohana buffer, which sets self::$output
		(ob_get_level() === self::$buffer_level) and ob_end_clean();

		// Run the output event
		Event::run('system.display', self::$output);

		// Render the final output
		self::render(self::$output);
	}

	/**
	 * Inserts global Kohana variables into the generated output and prints it.
	 *
	 * @param   string  final output that will displayed
	 * @return  void
	 */
	public static function render($output)
	{
		// Fetch memory usage in MB
		$memory = function_exists('memory_get_usage') ? (memory_get_usage() / 1024 / 1024) : 0;

		// Fetch benchmark for page execution time
		$benchmark = Benchmark::get(SYSTEM_BENCHMARK.'_total_execution');

		if (Config::item('core.render_stats') === TRUE)
		{
			// Replace the global template variables
			$output = str_replace(
				array
				(
					'{kohana_version}',
					'{kohana_codename}',
					'{execution_time}',
					'{memory_usage}',
					'{included_files}',
				),
				array
				(
					KOHANA_VERSION,
					KOHANA_CODENAME,
					$benchmark['time'],
					number_format($memory, 2).'MB',
					count(get_included_files()),
				),
				$output
			);
		}

		if ($level = Config::item('core.output_compression') AND ini_get('output_handler') !== 'ob_gzhandler' AND (int) ini_get('zlib.output_compression') === 0)
		{
			if ($level < 1 OR $level > 9)
			{
				// Normalize the level to be an integer between 1 and 9. This
				// step must be done to prevent gzencode from triggering an error
				$level = max(1, min($level, 9));
			}

			if (stripos(@$_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE)
			{
				$compress = 'gzip';
			}
			elseif (stripos(@$_SERVER['HTTP_ACCEPT_ENCODING'], 'deflate') !== FALSE)
			{
				$compress = 'deflate';
			}
		}

		if (isset($compress) AND $level > 0)
		{
			switch ($compress)
			{
				case 'gzip':
					// Compress output using gzip
					$output = gzencode($output, $level);
				break;
				case 'deflate':
					// Compress output using zlib (HTTP deflate)
					$output = gzdeflate($output, $level);
				break;
			}

			// This header must be sent with compressed content to prevent
			// browser caches from breaking
			header('Vary: Accept-Encoding');

			// Send the content encoding header
			header('Content-Encoding: '.$compress);

			// Sending Content-Length in CGI can result in unexpected behavior
			if (stripos(PHP_SAPI, 'cgi') === FALSE)
			{
				header('Content-Length: '.strlen($output));
			}
		}

		echo $output;
	}

	/**
	 * Dual-purpose PHP error and exception handler. Uses the kohana_error_page
	 * view to display the message.
	 *
	 * @param   integer|object  exception object or error code
	 * @param   string          error message
	 * @param   string          filename
	 * @param   integer         line number
	 * @return  void
	 */
	public static function exception_handler($exception, $message = NULL, $file = NULL, $line = NULL)
	{
		// PHP errors have 5 args, always
		$PHP_ERROR = (func_num_args() === 5);

		// Test to see if errors should be displayed
		if ($PHP_ERROR AND (error_reporting() & $exception) === 0)
			return;

		// This is useful for hooks to determine if a page has an error
		self::$has_error = TRUE;

		// Error handling will use exactly 5 args, every time
		if ($PHP_ERROR)
		{
			$code     = $exception;
			$type     = 'PHP Error';
			$template = 'kohana_error_page';
		}
		else
		{
			$code     = $exception->getCode();
			$type     = get_class($exception);
			$message  = $exception->getMessage();
			$file     = $exception->getFile();
			$line     = $exception->getLine();
			$template = ($exception instanceof Kohana_Exception) ? $exception->getTemplate() : 'kohana_error_page';
		}

		if (is_numeric($code))
		{
			$codes = Kohana::lang('errors');

			if ( ! empty($codes[$code]))
			{
				list($level, $error, $description) = $codes[$code];
			}
			else
			{
				$level = 1;
				$error = $PHP_ERROR ? 'Unknown Error' : get_class($exception);
				$description = '';
			}
		}
		else
		{
			// Custom error message, this will never be logged
			$level = 5;
			$error = $code;
			$description = '';
		}

		// Remove the DOCROOT from the path, as a security precaution
		$file = str_replace('\\', '/', realpath($file));
		$file = preg_replace('|^'.preg_quote(DOCROOT).'|', '', $file);

		if (Config::item('log.threshold') >= $level)
		{
			// Log the error
			Log::add('error', Kohana::lang('core.uncaught_exception', $type, $message, $file, $line));
		}

		if ($PHP_ERROR)
		{
			$description = Kohana::lang('errors.'.E_RECOVERABLE_ERROR);
			$description = is_array($description) ? $description[2] : '';
		}
		else
		{
			if (method_exists($exception, 'sendHeaders'))
			{
				// Send the headers if they have not already been sent
				headers_sent() or $exception->sendHeaders();
			}
		}

		while (ob_get_level() > self::$buffer_level)
		{
			// Clean all active output buffers
			ob_end_clean();
		}

		// Clear the current buffer
		(ob_get_level() === self::$buffer_level) and ob_clean();

		// Test if display_errors is on
		if (Config::item('core.display_errors'))
		{
			if ( ! IN_PRODUCTION AND $line != FALSE)
			{
				// Remove the first entry of debug_backtrace(), it is the exception_handler call
				$trace = $PHP_ERROR ? array_slice(debug_backtrace(), 1) : $exception->getTrace();

				// Beautify backtrace
				$trace = self::backtrace($trace);
			}

			// Load the error
			include self::find_file('views', empty($template) ? 'kohana_error_page' : $template);
		}
		else
		{
			// Get the i18n messages
			$error = Kohana::lang('core.generic_error');
			$message = sprintf(Kohana::lang('core.errors_disabled'), url::site(), url::site(Router::$current_uri));

			// Load the errors_disabled view
			include self::find_file('views', 'kohana_error_disabled');
		}

		// Run the system.shutdown event
		Event::has_run('system.shutdown') or Event::run('system.shutdown');

		// Turn off error reporting
		error_reporting(0);
		exit;
	}

	/**
	 * Displays a 404 page.
	 *
	 * @throws  Kohana_404_Exception
	 * @param   string  URI of page
	 * @param   string  custom template
	 * @return  void
	 */
	public static function show_404($page = FALSE, $template = FALSE)
	{
		throw new Kohana_404_Exception($page, $template);
	}

	/**
	 * Show a custom error message.
	 *
	 * @throws  Kohana_User_Exception
	 * @param   string  error title
	 * @param   string  error message
	 * @param   string  custom template
	 * @return  void
	 */
	public static function show_error($title, $message, $template = FALSE)
	{
		throw new Kohana_User_Exception($title, $message, $template);
	}

	/**
	 * Save data to a simple cache file. This should only be used internally, and
	 * is NOT a replacement for the Cache library.
	 *
	 * @param   string  cache name
	 * @param   mixed   data to cache
	 * @return  boolean
	 */
	public static function save_cache($name, $data = NULL)
	{
		static $cache_time;

		if ($cache_time === NULL)
		{
			// Load cache time from config
			$cache_time = Config::item('core.internal_cache');
		}

		if ($cache_time > 0)
		{
			$path = APPPATH.'cache/kohana_'.$name;

			if ($data === NULL)
			{
				// Delete cache
				return unlink($path);
			}
			else
			{
				// Write data to cache file
				return (bool) file_put_contents($path, serialize($data));
			}
		}
		else
		{
			// No caching enabled
			return FALSE;
		}
	}

	/**
	 * Load data from a simple cache file. This should only be used internally,
	 * and is NOT a replacement for the Cache library.
	 *
	 * @param   string  cache name
	 * @return  mixed
	 */
	public static function load_cache($name)
	{
		static $cache_time;

		if ($cache_time === NULL)
		{
			// Load cache time from config
			$cache_time = Config::item('core.internal_cache');
		}

		if ($cache_time > 0)
		{
			$path = APPPATH.'cache/kohana_'.$name;

			if (file_exists($path))
			{
				// Check the file modification time
				if ((time() - filemtime($path)) < $cache_time)
				{
					// Cache is valid
					return unserialize(file_get_contents($path));
				}
				else
				{
					// Cache is invalid, delete it
					unlink($path);
				}
			}
		}

		// No cache found
		return NULL;
	}

	/**
	 * Provides class auto-loading.
	 *
	 * @throws  Kohana_Exception
	 * @param   string  name of class
	 * @return  bool
	 */
	public static function auto_load($class)
	{
		static $prefix;

		// Set the extension prefix
		empty($prefix) and $prefix = Config::item('core.extension_prefix');

		if (class_exists($class, FALSE))
			return TRUE;

		if (($type = strrpos($class, '_')) !== FALSE)
		{
			// Find the class suffix
			$type = substr($class, $type + 1);
		}

		switch ($type)
		{
			case 'Core':
				$type = 'libraries';
				$file = substr($class, 0, -5);
			break;
			case 'Controller':
				$type = 'controllers';
				// Lowercase filename
				$file = strtolower(substr($class, 0, -11));
			break;
			case 'Model':
				$type = 'models';
				// Lowercase filename
				$file = strtolower(substr($class, 0, -6));
			break;
			case 'Driver':
				$type = 'libraries/drivers';
				$file = str_replace('_', '/', substr($class, 0, -7));
			break;
			default:
				// This can mean either a library or a helper, but libraries must
				// always be capitalized, so we check if the first character is
				// lowercase. If it is, we are loading a helper, not a library.
				$type = (ord($class[0]) > 96) ? 'helpers' : 'libraries';
				$file = $class;
			break;
		}


		// If the file doesn't exist, just return
		if (($filepath = self::find_file($type, $file)) === FALSE)
		{
			return FALSE;
		}


		// Load the requested file
		require_once $filepath;

		if ($type === 'libraries' OR $type === 'helpers')
		{
			if ($extension = self::find_file($type, $prefix.$class))
			{
				// Load the class extension
				require_once $extension;
			}
			elseif (substr($class, -5) !== '_Core' AND class_exists($class.'_Core', FALSE))
			{
				// Transparent class extensions are handled using eval. This is
				// a disgusting hack, but it works very well.
				eval('class '.$class.' extends '.$class.'_Core { }');
			}
		}

		return class_exists($class, FALSE);
	}

	/**
	 * Find a resource file in a given directory.
	 *
	 * @throws  Kohana_Exception  if file is required and not found
	 * @param   string   directory to search in
	 * @param   string   filename to look for (including extension only if 4th parameter is TRUE)
	 * @param   boolean  file required
	 * @param   boolean  file extension
	 * @return  array    if the type is config, i18n or l10n
	 * @return  string   if the file is found
	 * @return  FALSE    if the file is not found
	 */
	public static function find_file($directory, $filename, $required = FALSE, $ext = FALSE)
	{
		// Users can define their own extensions, css, xml, html, etc
		$ext = ($ext === FALSE) ? EXT : '.'.ltrim($ext, '.');

		// Search path
		$search = $directory.'/'.$filename.$ext;

		if (isset(self::$paths[$search]))
		{
			// Return the cached path
			return self::$paths[$search];
		}

		// Nothing found, yet
		$found = NULL;

		if ($directory === 'config' OR $directory === 'i18n' OR $directory === 'l10n')
		{
			// Search from SYSPATH up
			foreach (array_reverse(Config::include_paths()) as $path)
			{
				if (is_file($path.$search))
				{
					// A file has been found
					$found[] = $path.$search;
				}
			}
		}
		else
		{
			// Find the file and return its filename
			foreach (Config::include_paths() as $path)
			{
				if (is_file($path.$search))
				{
					// A file has been found
					$found = $path.$search;
					break;
				}
			}
		}

		if ($found === NULL)
		{
			if ($required === TRUE)
			{
				// If the file is required, throw an exception
				throw new Kohana_Exception('core.resource_not_found', Kohana::lang('core.'.inflector::singular($directory)), $filename);
			}
			else
			{
				// Nothing was found
				$found = FALSE;
			}
		}

		// Add paths to cache
		self::$paths[$search] = $found;

		if (self::$paths_changed === FALSE)
		{
			// Cache has changed
			self::$paths_changed = TRUE;

			// Save cache at shutdown
			Event::add('system.shutdown', array(__CLASS__, 'write_path_cache'));
		}

		return $found;
	}

	/**
	 * Writes the file path cache.
	 *
	 * @return  boolean
	 */
	public static function write_path_cache()
	{
		// Save updated cache
		return Kohana::save_cache('file_paths', self::$paths);
	}

	/**
	 * Lists all files and directories in a resource path.
	 *
	 * @param   string   directory to search
	 * @param   boolean  list all files to the maximum depth?
	 * @param   string   full path to search (used for recursion, *never* set this manually)
	 * @return  array    filenames and directories
	 */
	public static function list_files($directory, $recursive = FALSE, $path = FALSE)
	{
		$files = array();

		if ($path === FALSE)
		{
			foreach (Config::include_paths() as $path)
			{
				// Recursively get and merge all files
				$files = array_merge($files, self::list_files($directory, $recursive, $path.$directory));
			}
		}
		else
		{
			$path = rtrim($path, '/').'/';

			if (is_readable($path))
			{
				foreach (glob($path.'*') as $index => $item)
				{
					$files[] = $item = str_replace('\\', '/', $item);

					// Handle recursion
					if (is_dir($item) AND $recursive == TRUE)
					{
						// Filename should only be the basename
						$item = pathinfo($item, PATHINFO_BASENAME);

						// Append sub-directory search
						$files = array_merge($files, self::list_files($directory, TRUE, $path.$item));
					}
				}
			}
		}

		return $files;
	}

	/**
	 * Fetch an i18n language item.
	 *
	 * @param   string  language key to fetch
	 * @param   array   additional information to insert into the line
	 * @return  string  i18n language string, or the requested key if the i18n item is not found
	 */
	public static function lang($key, $args = array())
	{
		static $language = array();

		// Extract the main group from the key
		$group = explode('.', $key, 2);
		$group = $group[0];

		if (empty($language[$group]))
		{
			// Messages from this file
			$messages = array();

			// The name of the file to search for
			$filename = Config::item('locale.language').'/'.$group;

			// Loop through the files and include each one, so SYSPATH files
			// can be overloaded by more localized files
			foreach (self::find_file('i18n', $filename) as $file)
			{
				include $file;

				// Merge in configuration
				if ( ! empty($lang) AND is_array($lang))
				{
					foreach ($lang as $k => $v)
					{
						$messages[$k] = $v;
					}
				}
			}

			// Cache the type
			$language[$group] = $messages;
		}

		// Get the line from the language
		$line = self::key_string($language, $key);

		// Return the key string as fallback
		if ($line === NULL)
		{
			Log::add('error', 'Missing i18n entry '.$key.' for language '.Config::item('locale.language'));
			return $key;
		}

		if (is_string($line) AND func_num_args() > 1)
		{
			$args = array_slice(func_get_args(), 1);

			// Add the arguments into the line
			$line = vsprintf($line, is_array($args[0]) ? $args[0] : $args);
		}

		return $line;
	}

	/**
	 * Fetch an i10n locale item.
	 *
	 * @param   string  locale key to fetch
	 * @return  mixed   NULL if the key is not found
	 */
	public static function locale($key)
	{
		static $locale = array();

		if (empty($locale))
		{
			// Messages from this file
			$messages = array();

			// The name of the file to search for
			$filename = Config::item('locale.country');

			// Loop through the files and include each one, so SYSPATH files
			// can be overloaded by more localized files
			foreach (self::find_file('l10n', Config::item('locale.language').'/'.$filename) as $file)
			{
				include $file;

				// Merge in configuration
				if ( ! empty($locale) AND is_array($locale))
				{
					foreach ($locale as $k => $v)
					{
						$locale[$k] = $v;
					}
				}
			}
		}

		// Get the line from the language
		$line = self::key_string($locale, $key);

		// Return the key string as fallback
		if ($line === NULL)
		{
			Log::add('error', 'Missing i10n entry '.$key.' for locale '.$filename);
			return NULL;
		}

		return $line;
	}

	/**
	 * Returns the value of a key, defined by a 'dot-noted' string, from an array.
	 *
	 * @param   string  dot-noted string: foo.bar.baz
	 * @param   array   array to search
	 * @return  string  if the key is found
	 * @return  void    if the key is not found
	 */
	public static function key_string($array, $keys)
	{
		// No array to search
		if ((empty($keys) AND is_string($keys)) OR (empty($array) AND is_array($array)))
			return NULL;

		if (substr($keys, -2) === '.*')
		{
			// Remove the wildcard from the keys
			$keys = substr($keys, 0, -2);
		}

		// Prepare for loop
		$keys = explode('.', $keys);

		// Loop down and find the key
		do
		{
			// Get the current key
			$key = array_shift($keys);

			// Value is set, dig deeper or return
			if (isset($array[$key]))
			{
				// If the key is an array, and we haven't hit bottom, prepare
				// for the next loop by re-referencing to the next child
				if (is_array($array[$key]) AND ! empty($keys))
				{
					$array =& $array[$key];
				}
				else
				{
					// Requested key was found
					return $array[$key];
				}
			}
			else
			{
				// Requested key is not set
				break;
			}
		}
		while ( ! empty($keys));

		// We return NULL, because it's less common than FALSE
		return NULL;
	}

	/**
	 * Sets values in an array by using a 'dot-noted' string.
	 *
	 * @param   array   array to set keys in (reference)
	 * @param   string  dot-noted string: foo.bar.baz
	 * @return  mixed   fill value for the key
	 * @return  void
	 */
	public static function key_string_set( & $array, $keys, $fill = NULL)
	{
		if (is_object($array) AND ($array instanceof ArrayObject))
		{
			// Copy the array
			$array_copy = $array->getArrayCopy();

			// Is an object
			$array_object = TRUE;
		}
		else
		{
			if ( ! is_array($array))
			{
				// Must always be an array
				$array = (array) $array;
			}

			// Copy is a reference to the array
			$array_copy =& $array;
		}

		if (empty($keys))
			return $array;

		// Create keys
		$keys = explode('.', $keys);

		// Create reference to the array
		$row =& $array_copy;

		for ($i = 0, $end = count($keys) - 1; $i <= $end; $i++)
		{
			// Get the current key
			$key = $keys[$i];

			if ( ! isset($row[$key]))
			{
				if (isset($keys[$i + 1]))
				{
					// Make the value an array
					$row[$key] = array();
				}
				else
				{
					// Add the fill key
					$row[$key] = $fill;
				}
			}
			elseif (isset($keys[$i + 1]))
			{
				// Make the value an array
				$row[$key] = (array) $row[$key];
			}

			// Go down a level, creating a new row reference
			$row =& $row[$key];
		}

		if (isset($array_object))
		{
			// Swap the array back in
			$array->exchangeArray($array_copy);
		}
	}

	/**
	 * Retrieves current user agent information:
	 * keys:  browser, version, platform, mobile, robot, referrer, languages, charsets
	 * tests: is_browser, is_mobile, is_robot, accept_lang, accept_charset
	 *
	 * @param   string   key or test name
	 * @param   string   used with "accept" tests: user_agent(accept_lang, en)
	 * @return  array    languages and charsets
	 * @return  string   all other keys
	 * @return  boolean  all tests
	 */
	public static function user_agent($key = 'agent', $compare = NULL)
	{
		static $info;

		// Return the raw string
		if ($key === 'agent')
			return Kohana::$user_agent;

		if ($info === NULL)
		{
			// Parse the user agent and extract basic information
			foreach (Config::item('user_agents') as $type => $data)
			{
				foreach ($data as $agent => $name)
				{
					if (stripos(Kohana::$user_agent, $agent) !== FALSE)
					{
						if ($type === 'browser' AND preg_match('|'.preg_quote($agent).'[^0-9.]*+([0-9.]+)|i', Kohana::$user_agent, $match))
						{
							// Set the browser version
							$info['version'] = $match[1];
						}

						// Set the agent name
						$info[$type] = $name;
						break;
					}
				}
			}
		}

		if (empty($info[$key]))
		{
			switch ($key)
			{
				case 'is_robot':
				case 'is_browser':
				case 'is_mobile':
					// A boolean result
					$return = ! empty($info[substr($key, 3)]);
				break;
				case 'languages':
					$return = array();
					if ( ! empty($_SERVER['HTTP_ACCEPT_LANGUAGE']))
					{
						if (preg_match_all('/[-a-z]{2,}/', strtolower(trim($_SERVER['HTTP_ACCEPT_LANGUAGE'])), $matches))
						{
							// Found a result
							$return = $matches[0];
						}
					}
				break;
				case 'charsets':
					$return = array();
					if ( ! empty($_SERVER['HTTP_ACCEPT_CHARSET']))
					{
						if (preg_match_all('/[-a-z0-9]{2,}/', strtolower(trim($_SERVER['HTTP_ACCEPT_CHARSET'])), $matches))
						{
							// Found a result
							$return = $matches[0];
						}
					}
				break;
				case 'referrer':
					if ( ! empty($_SERVER['HTTP_REFERER']))
					{
						// Found a result
						$return = trim($_SERVER['HTTP_REFERER']);
					}
				break;
			}

			// Cache the return value
			isset($return) and $info[$key] = $return;
		}

		if ( ! empty($compare))
		{
			// The comparison must always be lowercase
			$compare = strtolower($compare);

			switch ($key)
			{
				case 'accept_lang':
					// Check if the lange is accepted
					return in_array($compare, Kohana::user_agent('languages'));
				break;
				case 'accept_charset':
					// Check if the charset is accepted
					return in_array($compare, Kohana::user_agent('charsets'));
				break;
				default:
					// Invalid comparison
					return FALSE;
				break;
			}
		}

		// Return the key, if set
		return isset($info[$key]) ? $info[$key] : NULL;
	}

	/**
	 * Quick debugging of any variable. Any number of parameters can be set.
	 *
	 * @return  string
	 */
	public static function debug()
	{
		if (func_num_args() === 0)
			return;

		// Get params
		$params = func_get_args();
		$output = array();

		foreach ($params as $var)
		{
			$output[] = '<pre>('.gettype($var).') '.html::specialchars(print_r($var, TRUE)).'</pre>';
		}

		return implode("\n", $output);
	}

	/**
	 * Displays nice backtrace information.
	 * @see http://php.net/debug_backtrace
	 *
	 * @param   array   backtrace generated by an exception or debug_backtrace
	 * @return  string
	 */
	public static function backtrace($trace)
	{
		if ( ! is_array($trace))
			return;

		// Final output
		$output = array();

		foreach ($trace as $entry)
		{
			$temp = '<li>';

			if (isset($entry['file']))
			{
				$temp .= Kohana::lang('core.error_file_line', preg_replace('!^'.preg_quote(DOCROOT).'!', '', $entry['file']), $entry['line']);
			}

			$temp .= '<pre>';

			if (isset($entry['class']))
			{
				// Add class and call type
				$temp .= $entry['class'].$entry['type'];
			}

			// Add function
			$temp .= $entry['function'].'( ';

			// Add function args
			if (isset($entry['args']) AND is_array($entry['args']))
			{
				// Separator starts as nothing
				$sep = '';

				while ($arg = array_shift($entry['args']))
				{
					if (is_string($arg) AND is_file($arg))
					{
						// Remove docroot from filename
						$arg = preg_replace('!^'.preg_quote(DOCROOT).'!', '', $arg);
					}

					$temp .= $sep.html::specialchars(print_r($arg, TRUE));

					// Change separator to a comma
					$sep = ', ';
				}
			}

			$temp .= ' )</pre></li>';

			$output[] = $temp;
		}

		return '<ul class="backtrace">'.implode("\n", $output).'</ul>';
	}

} // End Kohana

/**
 * Creates a generic i18n exception.
 */
class Kohana_Exception extends Exception {

	// Template file
	protected $template = 'kohana_error_page';

	// Header
	protected $header = FALSE;

	// Error code
	protected $code = E_KOHANA;

	/**
	 * Set exception message.
	 *
	 * @param  string  i18n language key for the message
	 * @param  array   addition line parameters
	 */
	public function __construct($error)
	{
		$args = array_slice(func_get_args(), 1);

		// Fetch the error message
		$message = Kohana::lang($error, $args);

		if ($message === $error OR empty($message))
		{
			// Unable to locate the message for the error
			$message = 'Unknown Exception: '.$error;
		}

		// Sets $this->message the proper way
		parent::__construct($message);
	}

	/**
	 * Magic method for converting an object to a string.
	 *
	 * @return  string  i18n message
	 */
	public function __toString()
	{
		return (string) $this->message;
	}

	/**
	 * Fetch the template name.
	 *
	 * @return  string
	 */
	public function getTemplate()
	{
		return $this->template;
	}

	/**
	 * Sends an Internal Server Error header.
	 *
	 * @return  void
	 */
	public function sendHeaders()
	{
		// Send the 500 header
		header('HTTP/1.1 500 Internal Server Error');
	}

} // End Kohana Exception

/**
 * Creates a custom exception.
 */
class Kohana_User_Exception extends Kohana_Exception {

	/**
	 * Set exception title and message.
	 *
	 * @param   string  exception title string
	 * @param   string  exception message string
	 * @param   string  custom error template
	 */
	public function __construct($title, $message, $template = FALSE)
	{
		Exception::__construct($message);

		$this->code = $title;

		if ($template !== FALSE)
		{
			$this->template = $template;
		}
	}

} // End Kohana PHP Exception

/**
 * Creates a Page Not Found exception.
 */
class Kohana_404_Exception extends Kohana_Exception {

	protected $code = E_PAGE_NOT_FOUND;

	/**
	 * Set internal properties.
	 *
	 * @param  string  URL of page
	 * @param  string  custom error template
	 */
	public function __construct($page = FALSE, $template = FALSE)
	{
		if ($page === FALSE)
		{
			// Construct the page URI using Router properties
			$page = Router::$current_uri.Router::$url_suffix.Router::$query_string;
		}

		Exception::__construct(Kohana::lang('core.page_not_found', $page));

		$this->template = $template;
	}

	/**
	 * Sends "File Not Found" headers, to emulate server behavior.
	 *
	 * @return void
	 */
	public function sendHeaders()
	{
		// Send the 404 header
		header('HTTP/1.1 404 File Not Found');
	}

} // End Kohana 404 Exception
Back to Top