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Developer Documentation
- Bug fixes for general core bugs in 3.10.x will end 8 November 2021 (12 months).
- Bug fixes for security issues in 3.10.x will end 9 May 2022 (18 months).
- PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
/lib/ -> weblib.php (source)
Differences Between: [Versions 310 and 311] [Versions 310 and 400] [Versions 310 and 401] [Versions 310 and 402] [Versions 310 and 403] [Versions 39 and 310]
1 <?php 2 // This file is part of Moodle - http://moodle.org/ 3 // 4 // Moodle is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // Moodle is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU General Public License for more details. 13 // 14 // You should have received a copy of the GNU General Public License 15 // along with Moodle. If not, see <http://www.gnu.org/licenses/>. 16 17 /** 18 * Library of functions for web output 19 * 20 * Library of all general-purpose Moodle PHP functions and constants 21 * that produce HTML output 22 * 23 * Other main libraries: 24 * - datalib.php - functions that access the database. 25 * - moodlelib.php - general-purpose Moodle functions. 26 * 27 * @package core 28 * @subpackage lib 29 * @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com} 30 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 31 */ 32 33 defined('MOODLE_INTERNAL') || die(); 34 35 // Constants. 36 37 // Define text formatting types ... eventually we can add Wiki, BBcode etc. 38 39 /** 40 * Does all sorts of transformations and filtering. 41 */ 42 define('FORMAT_MOODLE', '0'); 43 44 /** 45 * Plain HTML (with some tags stripped). 46 */ 47 define('FORMAT_HTML', '1'); 48 49 /** 50 * Plain text (even tags are printed in full). 51 */ 52 define('FORMAT_PLAIN', '2'); 53 54 /** 55 * Wiki-formatted text. 56 * Deprecated: left here just to note that '3' is not used (at the moment) 57 * and to catch any latent wiki-like text (which generates an error) 58 * @deprecated since 2005! 59 */ 60 define('FORMAT_WIKI', '3'); 61 62 /** 63 * Markdown-formatted text http://daringfireball.net/projects/markdown/ 64 */ 65 define('FORMAT_MARKDOWN', '4'); 66 67 /** 68 * A moodle_url comparison using this flag will return true if the base URLs match, params are ignored. 69 */ 70 define('URL_MATCH_BASE', 0); 71 72 /** 73 * A moodle_url comparison using this flag will return true if the base URLs match and the params of url1 are part of url2. 74 */ 75 define('URL_MATCH_PARAMS', 1); 76 77 /** 78 * A moodle_url comparison using this flag will return true if the two URLs are identical, except for the order of the params. 79 */ 80 define('URL_MATCH_EXACT', 2); 81 82 // Functions. 83 84 /** 85 * Add quotes to HTML characters. 86 * 87 * Returns $var with HTML characters (like "<", ">", etc.) properly quoted. 88 * Related function {@link p()} simply prints the output of this function. 89 * 90 * @param string $var the string potentially containing HTML characters 91 * @return string 92 */ 93 function s($var) { 94 95 if ($var === false) { 96 return '0'; 97 } 98 99 return preg_replace('/&#(\d+|x[0-9a-f]+);/i', '&#$1;', 100 htmlspecialchars($var, ENT_QUOTES | ENT_HTML401 | ENT_SUBSTITUTE)); 101 } 102 103 /** 104 * Add quotes to HTML characters. 105 * 106 * Prints $var with HTML characters (like "<", ">", etc.) properly quoted. 107 * This function simply calls & displays {@link s()}. 108 * @see s() 109 * 110 * @param string $var the string potentially containing HTML characters 111 * @return string 112 */ 113 function p($var) { 114 echo s($var); 115 } 116 117 /** 118 * Does proper javascript quoting. 119 * 120 * Do not use addslashes anymore, because it does not work when magic_quotes_sybase is enabled. 121 * 122 * @param mixed $var String, Array, or Object to add slashes to 123 * @return mixed quoted result 124 */ 125 function addslashes_js($var) { 126 if (is_string($var)) { 127 $var = str_replace('\\', '\\\\', $var); 128 $var = str_replace(array('\'', '"', "\n", "\r", "\0"), array('\\\'', '\\"', '\\n', '\\r', '\\0'), $var); 129 $var = str_replace('</', '<\/', $var); // XHTML compliance. 130 } else if (is_array($var)) { 131 $var = array_map('addslashes_js', $var); 132 } else if (is_object($var)) { 133 $a = get_object_vars($var); 134 foreach ($a as $key => $value) { 135 $a[$key] = addslashes_js($value); 136 } 137 $var = (object)$a; 138 } 139 return $var; 140 } 141 142 /** 143 * Remove query string from url. 144 * 145 * Takes in a URL and returns it without the querystring portion. 146 * 147 * @param string $url the url which may have a query string attached. 148 * @return string The remaining URL. 149 */ 150 function strip_querystring($url) { 151 152 if ($commapos = strpos($url, '?')) { 153 return substr($url, 0, $commapos); 154 } else { 155 return $url; 156 } 157 } 158 159 /** 160 * Returns the name of the current script, WITH the querystring portion. 161 * 162 * This function is necessary because PHP_SELF and REQUEST_URI and SCRIPT_NAME 163 * return different things depending on a lot of things like your OS, Web 164 * server, and the way PHP is compiled (ie. as a CGI, module, ISAPI, etc.) 165 * <b>NOTE:</b> This function returns false if the global variables needed are not set. 166 * 167 * @return mixed String or false if the global variables needed are not set. 168 */ 169 function me() { 170 global $ME; 171 return $ME; 172 } 173 174 /** 175 * Guesses the full URL of the current script. 176 * 177 * This function is using $PAGE->url, but may fall back to $FULLME which 178 * is constructed from PHP_SELF and REQUEST_URI or SCRIPT_NAME 179 * 180 * @return mixed full page URL string or false if unknown 181 */ 182 function qualified_me() { 183 global $FULLME, $PAGE, $CFG; 184 185 if (isset($PAGE) and $PAGE->has_set_url()) { 186 // This is the only recommended way to find out current page. 187 return $PAGE->url->out(false); 188 189 } else { 190 if ($FULLME === null) { 191 // CLI script most probably. 192 return false; 193 } 194 if (!empty($CFG->sslproxy)) { 195 // Return only https links when using SSL proxy. 196 return preg_replace('/^http:/', 'https:', $FULLME, 1); 197 } else { 198 return $FULLME; 199 } 200 } 201 } 202 203 /** 204 * Determines whether or not the Moodle site is being served over HTTPS. 205 * 206 * This is done simply by checking the value of $CFG->wwwroot, which seems 207 * to be the only reliable method. 208 * 209 * @return boolean True if site is served over HTTPS, false otherwise. 210 */ 211 function is_https() { 212 global $CFG; 213 214 return (strpos($CFG->wwwroot, 'https://') === 0); 215 } 216 217 /** 218 * Returns the cleaned local URL of the HTTP_REFERER less the URL query string parameters if required. 219 * 220 * @param bool $stripquery if true, also removes the query part of the url. 221 * @return string The resulting referer or empty string. 222 */ 223 function get_local_referer($stripquery = true) { 224 if (isset($_SERVER['HTTP_REFERER'])) { 225 $referer = clean_param($_SERVER['HTTP_REFERER'], PARAM_LOCALURL); 226 if ($stripquery) { 227 return strip_querystring($referer); 228 } else { 229 return $referer; 230 } 231 } else { 232 return ''; 233 } 234 } 235 236 /** 237 * Class for creating and manipulating urls. 238 * 239 * It can be used in moodle pages where config.php has been included without any further includes. 240 * 241 * It is useful for manipulating urls with long lists of params. 242 * One situation where it will be useful is a page which links to itself to perform various actions 243 * and / or to process form data. A moodle_url object : 244 * can be created for a page to refer to itself with all the proper get params being passed from page call to 245 * page call and methods can be used to output a url including all the params, optionally adding and overriding 246 * params and can also be used to 247 * - output the url without any get params 248 * - and output the params as hidden fields to be output within a form 249 * 250 * @copyright 2007 jamiesensei 251 * @link http://docs.moodle.org/dev/lib/weblib.php_moodle_url See short write up here 252 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 253 * @package core 254 */ 255 class moodle_url { 256 257 /** 258 * Scheme, ex.: http, https 259 * @var string 260 */ 261 protected $scheme = ''; 262 263 /** 264 * Hostname. 265 * @var string 266 */ 267 protected $host = ''; 268 269 /** 270 * Port number, empty means default 80 or 443 in case of http. 271 * @var int 272 */ 273 protected $port = ''; 274 275 /** 276 * Username for http auth. 277 * @var string 278 */ 279 protected $user = ''; 280 281 /** 282 * Password for http auth. 283 * @var string 284 */ 285 protected $pass = ''; 286 287 /** 288 * Script path. 289 * @var string 290 */ 291 protected $path = ''; 292 293 /** 294 * Optional slash argument value. 295 * @var string 296 */ 297 protected $slashargument = ''; 298 299 /** 300 * Anchor, may be also empty, null means none. 301 * @var string 302 */ 303 protected $anchor = null; 304 305 /** 306 * Url parameters as associative array. 307 * @var array 308 */ 309 protected $params = array(); 310 311 /** 312 * Create new instance of moodle_url. 313 * 314 * @param moodle_url|string $url - moodle_url means make a copy of another 315 * moodle_url and change parameters, string means full url or shortened 316 * form (ex.: '/course/view.php'). It is strongly encouraged to not include 317 * query string because it may result in double encoded values. Use the 318 * $params instead. For admin URLs, just use /admin/script.php, this 319 * class takes care of the $CFG->admin issue. 320 * @param array $params these params override current params or add new 321 * @param string $anchor The anchor to use as part of the URL if there is one. 322 * @throws moodle_exception 323 */ 324 public function __construct($url, array $params = null, $anchor = null) { 325 global $CFG; 326 327 if ($url instanceof moodle_url) { 328 $this->scheme = $url->scheme; 329 $this->host = $url->host; 330 $this->port = $url->port; 331 $this->user = $url->user; 332 $this->pass = $url->pass; 333 $this->path = $url->path; 334 $this->slashargument = $url->slashargument; 335 $this->params = $url->params; 336 $this->anchor = $url->anchor; 337 338 } else { 339 // Detect if anchor used. 340 $apos = strpos($url, '#'); 341 if ($apos !== false) { 342 $anchor = substr($url, $apos); 343 $anchor = ltrim($anchor, '#'); 344 $this->set_anchor($anchor); 345 $url = substr($url, 0, $apos); 346 } 347 348 // Normalise shortened form of our url ex.: '/course/view.php'. 349 if (strpos($url, '/') === 0) { 350 $url = $CFG->wwwroot.$url; 351 } 352 353 if ($CFG->admin !== 'admin') { 354 if (strpos($url, "$CFG->wwwroot/admin/") === 0) { 355 $url = str_replace("$CFG->wwwroot/admin/", "$CFG->wwwroot/$CFG->admin/", $url); 356 } 357 } 358 359 // Parse the $url. 360 $parts = parse_url($url); 361 if ($parts === false) { 362 throw new moodle_exception('invalidurl'); 363 } 364 if (isset($parts['query'])) { 365 // Note: the values may not be correctly decoded, url parameters should be always passed as array. 366 parse_str(str_replace('&', '&', $parts['query']), $this->params); 367 } 368 unset($parts['query']); 369 foreach ($parts as $key => $value) { 370 $this->$key = $value; 371 } 372 373 // Detect slashargument value from path - we do not support directory names ending with .php. 374 $pos = strpos($this->path, '.php/'); 375 if ($pos !== false) { 376 $this->slashargument = substr($this->path, $pos + 4); 377 $this->path = substr($this->path, 0, $pos + 4); 378 } 379 } 380 381 $this->params($params); 382 if ($anchor !== null) { 383 $this->anchor = (string)$anchor; 384 } 385 } 386 387 /** 388 * Add an array of params to the params for this url. 389 * 390 * The added params override existing ones if they have the same name. 391 * 392 * @param array $params Defaults to null. If null then returns all params. 393 * @return array Array of Params for url. 394 * @throws coding_exception 395 */ 396 public function params(array $params = null) { 397 $params = (array)$params; 398 399 foreach ($params as $key => $value) { 400 if (is_int($key)) { 401 throw new coding_exception('Url parameters can not have numeric keys!'); 402 } 403 if (!is_string($value)) { 404 if (is_array($value)) { 405 throw new coding_exception('Url parameters values can not be arrays!'); 406 } 407 if (is_object($value) and !method_exists($value, '__toString')) { 408 throw new coding_exception('Url parameters values can not be objects, unless __toString() is defined!'); 409 } 410 } 411 $this->params[$key] = (string)$value; 412 } 413 return $this->params; 414 } 415 416 /** 417 * Remove all params if no arguments passed. 418 * Remove selected params if arguments are passed. 419 * 420 * Can be called as either remove_params('param1', 'param2') 421 * or remove_params(array('param1', 'param2')). 422 * 423 * @param string[]|string $params,... either an array of param names, or 1..n string params to remove as args. 424 * @return array url parameters 425 */ 426 public function remove_params($params = null) { 427 if (!is_array($params)) { 428 $params = func_get_args(); 429 } 430 foreach ($params as $param) { 431 unset($this->params[$param]); 432 } 433 return $this->params; 434 } 435 436 /** 437 * Remove all url parameters. 438 * 439 * @todo remove the unused param. 440 * @param array $params Unused param 441 * @return void 442 */ 443 public function remove_all_params($params = null) { 444 $this->params = array(); 445 $this->slashargument = ''; 446 } 447 448 /** 449 * Add a param to the params for this url. 450 * 451 * The added param overrides existing one if they have the same name. 452 * 453 * @param string $paramname name 454 * @param string $newvalue Param value. If new value specified current value is overriden or parameter is added 455 * @return mixed string parameter value, null if parameter does not exist 456 */ 457 public function param($paramname, $newvalue = '') { 458 if (func_num_args() > 1) { 459 // Set new value. 460 $this->params(array($paramname => $newvalue)); 461 } 462 if (isset($this->params[$paramname])) { 463 return $this->params[$paramname]; 464 } else { 465 return null; 466 } 467 } 468 469 /** 470 * Merges parameters and validates them 471 * 472 * @param array $overrideparams 473 * @return array merged parameters 474 * @throws coding_exception 475 */ 476 protected function merge_overrideparams(array $overrideparams = null) { 477 $overrideparams = (array)$overrideparams; 478 $params = $this->params; 479 foreach ($overrideparams as $key => $value) { 480 if (is_int($key)) { 481 throw new coding_exception('Overridden parameters can not have numeric keys!'); 482 } 483 if (is_array($value)) { 484 throw new coding_exception('Overridden parameters values can not be arrays!'); 485 } 486 if (is_object($value) and !method_exists($value, '__toString')) { 487 throw new coding_exception('Overridden parameters values can not be objects, unless __toString() is defined!'); 488 } 489 $params[$key] = (string)$value; 490 } 491 return $params; 492 } 493 494 /** 495 * Get the params as as a query string. 496 * 497 * This method should not be used outside of this method. 498 * 499 * @param bool $escaped Use & as params separator instead of plain & 500 * @param array $overrideparams params to add to the output params, these 501 * override existing ones with the same name. 502 * @return string query string that can be added to a url. 503 */ 504 public function get_query_string($escaped = true, array $overrideparams = null) { 505 $arr = array(); 506 if ($overrideparams !== null) { 507 $params = $this->merge_overrideparams($overrideparams); 508 } else { 509 $params = $this->params; 510 } 511 foreach ($params as $key => $val) { 512 if (is_array($val)) { 513 foreach ($val as $index => $value) { 514 $arr[] = rawurlencode($key.'['.$index.']')."=".rawurlencode($value); 515 } 516 } else { 517 if (isset($val) && $val !== '') { 518 $arr[] = rawurlencode($key)."=".rawurlencode($val); 519 } else { 520 $arr[] = rawurlencode($key); 521 } 522 } 523 } 524 if ($escaped) { 525 return implode('&', $arr); 526 } else { 527 return implode('&', $arr); 528 } 529 } 530 531 /** 532 * Shortcut for printing of encoded URL. 533 * 534 * @return string 535 */ 536 public function __toString() { 537 return $this->out(true); 538 } 539 540 /** 541 * Output url. 542 * 543 * If you use the returned URL in HTML code, you want the escaped ampersands. If you use 544 * the returned URL in HTTP headers, you want $escaped=false. 545 * 546 * @param bool $escaped Use & as params separator instead of plain & 547 * @param array $overrideparams params to add to the output url, these override existing ones with the same name. 548 * @return string Resulting URL 549 */ 550 public function out($escaped = true, array $overrideparams = null) { 551 552 global $CFG; 553 554 if (!is_bool($escaped)) { 555 debugging('Escape parameter must be of type boolean, '.gettype($escaped).' given instead.'); 556 } 557 558 $url = $this; 559 560 // Allow url's to be rewritten by a plugin. 561 if (isset($CFG->urlrewriteclass) && !isset($CFG->upgraderunning)) { 562 $class = $CFG->urlrewriteclass; 563 $pluginurl = $class::url_rewrite($url); 564 if ($pluginurl instanceof moodle_url) { 565 $url = $pluginurl; 566 } 567 } 568 569 return $url->raw_out($escaped, $overrideparams); 570 571 } 572 573 /** 574 * Output url without any rewrites 575 * 576 * This is identical in signature and use to out() but doesn't call the rewrite handler. 577 * 578 * @param bool $escaped Use & as params separator instead of plain & 579 * @param array $overrideparams params to add to the output url, these override existing ones with the same name. 580 * @return string Resulting URL 581 */ 582 public function raw_out($escaped = true, array $overrideparams = null) { 583 if (!is_bool($escaped)) { 584 debugging('Escape parameter must be of type boolean, '.gettype($escaped).' given instead.'); 585 } 586 587 $uri = $this->out_omit_querystring().$this->slashargument; 588 589 $querystring = $this->get_query_string($escaped, $overrideparams); 590 if ($querystring !== '') { 591 $uri .= '?' . $querystring; 592 } 593 if (!is_null($this->anchor)) { 594 $uri .= '#'.$this->anchor; 595 } 596 597 return $uri; 598 } 599 600 /** 601 * Returns url without parameters, everything before '?'. 602 * 603 * @param bool $includeanchor if {@link self::anchor} is defined, should it be returned? 604 * @return string 605 */ 606 public function out_omit_querystring($includeanchor = false) { 607 608 $uri = $this->scheme ? $this->scheme.':'.((strtolower($this->scheme) == 'mailto') ? '':'//'): ''; 609 $uri .= $this->user ? $this->user.($this->pass? ':'.$this->pass:'').'@':''; 610 $uri .= $this->host ? $this->host : ''; 611 $uri .= $this->port ? ':'.$this->port : ''; 612 $uri .= $this->path ? $this->path : ''; 613 if ($includeanchor and !is_null($this->anchor)) { 614 $uri .= '#' . $this->anchor; 615 } 616 617 return $uri; 618 } 619 620 /** 621 * Compares this moodle_url with another. 622 * 623 * See documentation of constants for an explanation of the comparison flags. 624 * 625 * @param moodle_url $url The moodle_url object to compare 626 * @param int $matchtype The type of comparison (URL_MATCH_BASE, URL_MATCH_PARAMS, URL_MATCH_EXACT) 627 * @return bool 628 */ 629 public function compare(moodle_url $url, $matchtype = URL_MATCH_EXACT) { 630 631 $baseself = $this->out_omit_querystring(); 632 $baseother = $url->out_omit_querystring(); 633 634 // Append index.php if there is no specific file. 635 if (substr($baseself, -1) == '/') { 636 $baseself .= 'index.php'; 637 } 638 if (substr($baseother, -1) == '/') { 639 $baseother .= 'index.php'; 640 } 641 642 // Compare the two base URLs. 643 if ($baseself != $baseother) { 644 return false; 645 } 646 647 if ($matchtype == URL_MATCH_BASE) { 648 return true; 649 } 650 651 $urlparams = $url->params(); 652 foreach ($this->params() as $param => $value) { 653 if ($param == 'sesskey') { 654 continue; 655 } 656 if (!array_key_exists($param, $urlparams) || $urlparams[$param] != $value) { 657 return false; 658 } 659 } 660 661 if ($matchtype == URL_MATCH_PARAMS) { 662 return true; 663 } 664 665 foreach ($urlparams as $param => $value) { 666 if ($param == 'sesskey') { 667 continue; 668 } 669 if (!array_key_exists($param, $this->params()) || $this->param($param) != $value) { 670 return false; 671 } 672 } 673 674 if ($url->anchor !== $this->anchor) { 675 return false; 676 } 677 678 return true; 679 } 680 681 /** 682 * Sets the anchor for the URI (the bit after the hash) 683 * 684 * @param string $anchor null means remove previous 685 */ 686 public function set_anchor($anchor) { 687 if (is_null($anchor)) { 688 // Remove. 689 $this->anchor = null; 690 } else if ($anchor === '') { 691 // Special case, used as empty link. 692 $this->anchor = ''; 693 } else if (preg_match('|[a-zA-Z\_\:][a-zA-Z0-9\_\-\.\:]*|', $anchor)) { 694 // Match the anchor against the NMTOKEN spec. 695 $this->anchor = $anchor; 696 } else { 697 // Bad luck, no valid anchor found. 698 $this->anchor = null; 699 } 700 } 701 702 /** 703 * Sets the scheme for the URI (the bit before ://) 704 * 705 * @param string $scheme 706 */ 707 public function set_scheme($scheme) { 708 // See http://www.ietf.org/rfc/rfc3986.txt part 3.1. 709 if (preg_match('/^[a-zA-Z][a-zA-Z0-9+.-]*$/', $scheme)) { 710 $this->scheme = $scheme; 711 } else { 712 throw new coding_exception('Bad URL scheme.'); 713 } 714 } 715 716 /** 717 * Sets the url slashargument value. 718 * 719 * @param string $path usually file path 720 * @param string $parameter name of page parameter if slasharguments not supported 721 * @param bool $supported usually null, then it depends on $CFG->slasharguments, use true or false for other servers 722 * @return void 723 */ 724 public function set_slashargument($path, $parameter = 'file', $supported = null) { 725 global $CFG; 726 if (is_null($supported)) { 727 $supported = !empty($CFG->slasharguments); 728 } 729 730 if ($supported) { 731 $parts = explode('/', $path); 732 $parts = array_map('rawurlencode', $parts); 733 $path = implode('/', $parts); 734 $this->slashargument = $path; 735 unset($this->params[$parameter]); 736 737 } else { 738 $this->slashargument = ''; 739 $this->params[$parameter] = $path; 740 } 741 } 742 743 // Static factory methods. 744 745 /** 746 * General moodle file url. 747 * 748 * @param string $urlbase the script serving the file 749 * @param string $path 750 * @param bool $forcedownload 751 * @return moodle_url 752 */ 753 public static function make_file_url($urlbase, $path, $forcedownload = false) { 754 $params = array(); 755 if ($forcedownload) { 756 $params['forcedownload'] = 1; 757 } 758 $url = new moodle_url($urlbase, $params); 759 $url->set_slashargument($path); 760 return $url; 761 } 762 763 /** 764 * Factory method for creation of url pointing to plugin file. 765 * 766 * Please note this method can be used only from the plugins to 767 * create urls of own files, it must not be used outside of plugins! 768 * 769 * @param int $contextid 770 * @param string $component 771 * @param string $area 772 * @param int $itemid 773 * @param string $pathname 774 * @param string $filename 775 * @param bool $forcedownload 776 * @param mixed $includetoken Whether to use a user token when displaying this group image. 777 * True indicates to generate a token for current user, and integer value indicates to generate a token for the 778 * user whose id is the value indicated. 779 * If the group picture is included in an e-mail or some other location where the audience is a specific 780 * user who will not be logged in when viewing, then we use a token to authenticate the user. 781 * @return moodle_url 782 */ 783 public static function make_pluginfile_url($contextid, $component, $area, $itemid, $pathname, $filename, 784 $forcedownload = false, $includetoken = false) { 785 global $CFG, $USER; 786 787 $path = []; 788 789 if ($includetoken) { 790 $urlbase = "$CFG->wwwroot/tokenpluginfile.php"; 791 $userid = $includetoken === true ? $USER->id : $includetoken; 792 $token = get_user_key('core_files', $userid); 793 if ($CFG->slasharguments) { 794 $path[] = $token; 795 } 796 } else { 797 $urlbase = "$CFG->wwwroot/pluginfile.php"; 798 } 799 $path[] = $contextid; 800 $path[] = $component; 801 $path[] = $area; 802 803 if ($itemid !== null) { 804 $path[] = $itemid; 805 } 806 807 $path = "/" . implode('/', $path) . "{$pathname}{$filename}"; 808 809 $url = self::make_file_url($urlbase, $path, $forcedownload, $includetoken); 810 if ($includetoken && empty($CFG->slasharguments)) { 811 $url->param('token', $token); 812 } 813 return $url; 814 } 815 816 /** 817 * Factory method for creation of url pointing to plugin file. 818 * This method is the same that make_pluginfile_url but pointing to the webservice pluginfile.php script. 819 * It should be used only in external functions. 820 * 821 * @since 2.8 822 * @param int $contextid 823 * @param string $component 824 * @param string $area 825 * @param int $itemid 826 * @param string $pathname 827 * @param string $filename 828 * @param bool $forcedownload 829 * @return moodle_url 830 */ 831 public static function make_webservice_pluginfile_url($contextid, $component, $area, $itemid, $pathname, $filename, 832 $forcedownload = false) { 833 global $CFG; 834 $urlbase = "$CFG->wwwroot/webservice/pluginfile.php"; 835 if ($itemid === null) { 836 return self::make_file_url($urlbase, "/$contextid/$component/$area".$pathname.$filename, $forcedownload); 837 } else { 838 return self::make_file_url($urlbase, "/$contextid/$component/$area/$itemid".$pathname.$filename, $forcedownload); 839 } 840 } 841 842 /** 843 * Factory method for creation of url pointing to draft file of current user. 844 * 845 * @param int $draftid draft item id 846 * @param string $pathname 847 * @param string $filename 848 * @param bool $forcedownload 849 * @return moodle_url 850 */ 851 public static function make_draftfile_url($draftid, $pathname, $filename, $forcedownload = false) { 852 global $CFG, $USER; 853 $urlbase = "$CFG->wwwroot/draftfile.php"; 854 $context = context_user::instance($USER->id); 855 856 return self::make_file_url($urlbase, "/$context->id/user/draft/$draftid".$pathname.$filename, $forcedownload); 857 } 858 859 /** 860 * Factory method for creating of links to legacy course files. 861 * 862 * @param int $courseid 863 * @param string $filepath 864 * @param bool $forcedownload 865 * @return moodle_url 866 */ 867 public static function make_legacyfile_url($courseid, $filepath, $forcedownload = false) { 868 global $CFG; 869 870 $urlbase = "$CFG->wwwroot/file.php"; 871 return self::make_file_url($urlbase, '/'.$courseid.'/'.$filepath, $forcedownload); 872 } 873 874 /** 875 * Returns URL a relative path from $CFG->wwwroot 876 * 877 * Can be used for passing around urls with the wwwroot stripped 878 * 879 * @param boolean $escaped Use & as params separator instead of plain & 880 * @param array $overrideparams params to add to the output url, these override existing ones with the same name. 881 * @return string Resulting URL 882 * @throws coding_exception if called on a non-local url 883 */ 884 public function out_as_local_url($escaped = true, array $overrideparams = null) { 885 global $CFG; 886 887 $url = $this->out($escaped, $overrideparams); 888 889 // Url should be equal to wwwroot. If not then throw exception. 890 if (($url === $CFG->wwwroot) || (strpos($url, $CFG->wwwroot.'/') === 0)) { 891 $localurl = substr($url, strlen($CFG->wwwroot)); 892 return !empty($localurl) ? $localurl : ''; 893 } else { 894 throw new coding_exception('out_as_local_url called on a non-local URL'); 895 } 896 } 897 898 /** 899 * Returns the 'path' portion of a URL. For example, if the URL is 900 * http://www.example.org:447/my/file/is/here.txt?really=1 then this will 901 * return '/my/file/is/here.txt'. 902 * 903 * By default the path includes slash-arguments (for example, 904 * '/myfile.php/extra/arguments') so it is what you would expect from a 905 * URL path. If you don't want this behaviour, you can opt to exclude the 906 * slash arguments. (Be careful: if the $CFG variable slasharguments is 907 * disabled, these URLs will have a different format and you may need to 908 * look at the 'file' parameter too.) 909 * 910 * @param bool $includeslashargument If true, includes slash arguments 911 * @return string Path of URL 912 */ 913 public function get_path($includeslashargument = true) { 914 return $this->path . ($includeslashargument ? $this->slashargument : ''); 915 } 916 917 /** 918 * Returns a given parameter value from the URL. 919 * 920 * @param string $name Name of parameter 921 * @return string Value of parameter or null if not set 922 */ 923 public function get_param($name) { 924 if (array_key_exists($name, $this->params)) { 925 return $this->params[$name]; 926 } else { 927 return null; 928 } 929 } 930 931 /** 932 * Returns the 'scheme' portion of a URL. For example, if the URL is 933 * http://www.example.org:447/my/file/is/here.txt?really=1 then this will 934 * return 'http' (without the colon). 935 * 936 * @return string Scheme of the URL. 937 */ 938 public function get_scheme() { 939 return $this->scheme; 940 } 941 942 /** 943 * Returns the 'host' portion of a URL. For example, if the URL is 944 * http://www.example.org:447/my/file/is/here.txt?really=1 then this will 945 * return 'www.example.org'. 946 * 947 * @return string Host of the URL. 948 */ 949 public function get_host() { 950 return $this->host; 951 } 952 953 /** 954 * Returns the 'port' portion of a URL. For example, if the URL is 955 * http://www.example.org:447/my/file/is/here.txt?really=1 then this will 956 * return '447'. 957 * 958 * @return string Port of the URL. 959 */ 960 public function get_port() { 961 return $this->port; 962 } 963 } 964 965 /** 966 * Determine if there is data waiting to be processed from a form 967 * 968 * Used on most forms in Moodle to check for data 969 * Returns the data as an object, if it's found. 970 * This object can be used in foreach loops without 971 * casting because it's cast to (array) automatically 972 * 973 * Checks that submitted POST data exists and returns it as object. 974 * 975 * @return mixed false or object 976 */ 977 function data_submitted() { 978 979 if (empty($_POST)) { 980 return false; 981 } else { 982 return (object)fix_utf8($_POST); 983 } 984 } 985 986 /** 987 * Given some normal text this function will break up any 988 * long words to a given size by inserting the given character 989 * 990 * It's multibyte savvy and doesn't change anything inside html tags. 991 * 992 * @param string $string the string to be modified 993 * @param int $maxsize maximum length of the string to be returned 994 * @param string $cutchar the string used to represent word breaks 995 * @return string 996 */ 997 function break_up_long_words($string, $maxsize=20, $cutchar=' ') { 998 999 // First of all, save all the tags inside the text to skip them. 1000 $tags = array(); 1001 filter_save_tags($string, $tags); 1002 1003 // Process the string adding the cut when necessary. 1004 $output = ''; 1005 $length = core_text::strlen($string); 1006 $wordlength = 0; 1007 1008 for ($i=0; $i<$length; $i++) { 1009 $char = core_text::substr($string, $i, 1); 1010 if ($char == ' ' or $char == "\t" or $char == "\n" or $char == "\r" or $char == "<" or $char == ">") { 1011 $wordlength = 0; 1012 } else { 1013 $wordlength++; 1014 if ($wordlength > $maxsize) { 1015 $output .= $cutchar; 1016 $wordlength = 0; 1017 } 1018 } 1019 $output .= $char; 1020 } 1021 1022 // Finally load the tags back again. 1023 if (!empty($tags)) { 1024 $output = str_replace(array_keys($tags), $tags, $output); 1025 } 1026 1027 return $output; 1028 } 1029 1030 /** 1031 * Try and close the current window using JavaScript, either immediately, or after a delay. 1032 * 1033 * Echo's out the resulting XHTML & javascript 1034 * 1035 * @param integer $delay a delay in seconds before closing the window. Default 0. 1036 * @param boolean $reloadopener if true, we will see if this window was a pop-up, and try 1037 * to reload the parent window before this one closes. 1038 */ 1039 function close_window($delay = 0, $reloadopener = false) { 1040 global $PAGE, $OUTPUT; 1041 1042 if (!$PAGE->headerprinted) { 1043 $PAGE->set_title(get_string('closewindow')); 1044 echo $OUTPUT->header(); 1045 } else { 1046 $OUTPUT->container_end_all(false); 1047 } 1048 1049 if ($reloadopener) { 1050 // Trigger the reload immediately, even if the reload is after a delay. 1051 $PAGE->requires->js_function_call('window.opener.location.reload', array(true)); 1052 } 1053 $OUTPUT->notification(get_string('windowclosing'), 'notifysuccess'); 1054 1055 $PAGE->requires->js_function_call('close_window', array(new stdClass()), false, $delay); 1056 1057 echo $OUTPUT->footer(); 1058 exit; 1059 } 1060 1061 /** 1062 * Returns a string containing a link to the user documentation for the current page. 1063 * 1064 * Also contains an icon by default. Shown to teachers and admin only. 1065 * 1066 * @param string $text The text to be displayed for the link 1067 * @return string The link to user documentation for this current page 1068 */ 1069 function page_doc_link($text='') { 1070 global $OUTPUT, $PAGE; 1071 $path = page_get_doc_link_path($PAGE); 1072 if (!$path) { 1073 return ''; 1074 } 1075 return $OUTPUT->doc_link($path, $text); 1076 } 1077 1078 /** 1079 * Returns the path to use when constructing a link to the docs. 1080 * 1081 * @since Moodle 2.5.1 2.6 1082 * @param moodle_page $page 1083 * @return string 1084 */ 1085 function page_get_doc_link_path(moodle_page $page) { 1086 global $CFG; 1087 1088 if (empty($CFG->docroot) || during_initial_install()) { 1089 return ''; 1090 } 1091 if (!has_capability('moodle/site:doclinks', $page->context)) { 1092 return ''; 1093 } 1094 1095 $path = $page->docspath; 1096 if (!$path) { 1097 return ''; 1098 } 1099 return $path; 1100 } 1101 1102 1103 /** 1104 * Validates an email to make sure it makes sense. 1105 * 1106 * @param string $address The email address to validate. 1107 * @return boolean 1108 */ 1109 function validate_email($address) { 1110 global $CFG; 1111 require_once($CFG->libdir.'/phpmailer/moodle_phpmailer.php'); 1112 1113 return moodle_phpmailer::validateAddress($address) && !preg_match('/[<>]/', $address); 1114 } 1115 1116 /** 1117 * Extracts file argument either from file parameter or PATH_INFO 1118 * 1119 * Note: $scriptname parameter is not needed anymore 1120 * 1121 * @return string file path (only safe characters) 1122 */ 1123 function get_file_argument() { 1124 global $SCRIPT; 1125 1126 $relativepath = false; 1127 $hasforcedslashargs = false; 1128 1129 if (isset($_SERVER['REQUEST_URI']) && !empty($_SERVER['REQUEST_URI'])) { 1130 // Checks whether $_SERVER['REQUEST_URI'] contains '/pluginfile.php/' 1131 // instead of '/pluginfile.php?', when serving a file from e.g. mod_imscp or mod_scorm. 1132 if ((strpos($_SERVER['REQUEST_URI'], '/pluginfile.php/') !== false) 1133 && isset($_SERVER['PATH_INFO']) && !empty($_SERVER['PATH_INFO'])) { 1134 // Exclude edge cases like '/pluginfile.php/?file='. 1135 $args = explode('/', ltrim($_SERVER['PATH_INFO'], '/')); 1136 $hasforcedslashargs = (count($args) > 2); // Always at least: context, component and filearea. 1137 } 1138 } 1139 if (!$hasforcedslashargs) { 1140 $relativepath = optional_param('file', false, PARAM_PATH); 1141 } 1142 1143 if ($relativepath !== false and $relativepath !== '') { 1144 return $relativepath; 1145 } 1146 $relativepath = false; 1147 1148 // Then try extract file from the slasharguments. 1149 if (stripos($_SERVER['SERVER_SOFTWARE'], 'iis') !== false) { 1150 // NOTE: IIS tends to convert all file paths to single byte DOS encoding, 1151 // we can not use other methods because they break unicode chars, 1152 // the only ways are to use URL rewriting 1153 // OR 1154 // to properly set the 'FastCGIUtf8ServerVariables' registry key. 1155 if (isset($_SERVER['PATH_INFO']) and $_SERVER['PATH_INFO'] !== '') { 1156 // Check that PATH_INFO works == must not contain the script name. 1157 if (strpos($_SERVER['PATH_INFO'], $SCRIPT) === false) { 1158 $relativepath = clean_param(urldecode($_SERVER['PATH_INFO']), PARAM_PATH); 1159 } 1160 } 1161 } else { 1162 // All other apache-like servers depend on PATH_INFO. 1163 if (isset($_SERVER['PATH_INFO'])) { 1164 if (isset($_SERVER['SCRIPT_NAME']) and strpos($_SERVER['PATH_INFO'], $_SERVER['SCRIPT_NAME']) === 0) { 1165 $relativepath = substr($_SERVER['PATH_INFO'], strlen($_SERVER['SCRIPT_NAME'])); 1166 } else { 1167 $relativepath = $_SERVER['PATH_INFO']; 1168 } 1169 $relativepath = clean_param($relativepath, PARAM_PATH); 1170 } 1171 } 1172 1173 return $relativepath; 1174 } 1175 1176 /** 1177 * Just returns an array of text formats suitable for a popup menu 1178 * 1179 * @return array 1180 */ 1181 function format_text_menu() { 1182 return array (FORMAT_MOODLE => get_string('formattext'), 1183 FORMAT_HTML => get_string('formathtml'), 1184 FORMAT_PLAIN => get_string('formatplain'), 1185 FORMAT_MARKDOWN => get_string('formatmarkdown')); 1186 } 1187 1188 /** 1189 * Given text in a variety of format codings, this function returns the text as safe HTML. 1190 * 1191 * This function should mainly be used for long strings like posts, 1192 * answers, glossary items etc. For short strings {@link format_string()}. 1193 * 1194 * <pre> 1195 * Options: 1196 * trusted : If true the string won't be cleaned. Default false required noclean=true. 1197 * noclean : If true the string won't be cleaned, unless $CFG->forceclean is set. Default false required trusted=true. 1198 * nocache : If true the strign will not be cached and will be formatted every call. Default false. 1199 * filter : If true the string will be run through applicable filters as well. Default true. 1200 * para : If true then the returned string will be wrapped in div tags. Default true. 1201 * newlines : If true then lines newline breaks will be converted to HTML newline breaks. Default true. 1202 * context : The context that will be used for filtering. 1203 * overflowdiv : If set to true the formatted text will be encased in a div 1204 * with the class no-overflow before being returned. Default false. 1205 * allowid : If true then id attributes will not be removed, even when 1206 * using htmlpurifier. Default false. 1207 * blanktarget : If true all <a> tags will have target="_blank" added unless target is explicitly specified. 1208 * </pre> 1209 * 1210 * @staticvar array $croncache 1211 * @param string $text The text to be formatted. This is raw text originally from user input. 1212 * @param int $format Identifier of the text format to be used 1213 * [FORMAT_MOODLE, FORMAT_HTML, FORMAT_PLAIN, FORMAT_MARKDOWN] 1214 * @param object/array $options text formatting options 1215 * @param int $courseiddonotuse deprecated course id, use context option instead 1216 * @return string 1217 */ 1218 function format_text($text, $format = FORMAT_MOODLE, $options = null, $courseiddonotuse = null) { 1219 global $CFG, $DB, $PAGE; 1220 1221 if ($text === '' || is_null($text)) { 1222 // No need to do any filters and cleaning. 1223 return ''; 1224 } 1225 1226 // Detach object, we can not modify it. 1227 $options = (array)$options; 1228 1229 if (!isset($options['trusted'])) { 1230 $options['trusted'] = false; 1231 } 1232 if (!isset($options['noclean'])) { 1233 if ($options['trusted'] and trusttext_active()) { 1234 // No cleaning if text trusted and noclean not specified. 1235 $options['noclean'] = true; 1236 } else { 1237 $options['noclean'] = false; 1238 } 1239 } 1240 if (!empty($CFG->forceclean)) { 1241 // Whatever the caller claims, the admin wants all content cleaned anyway. 1242 $options['noclean'] = false; 1243 } 1244 if (!isset($options['nocache'])) { 1245 $options['nocache'] = false; 1246 } 1247 if (!isset($options['filter'])) { 1248 $options['filter'] = true; 1249 } 1250 if (!isset($options['para'])) { 1251 $options['para'] = true; 1252 } 1253 if (!isset($options['newlines'])) { 1254 $options['newlines'] = true; 1255 } 1256 if (!isset($options['overflowdiv'])) { 1257 $options['overflowdiv'] = false; 1258 } 1259 $options['blanktarget'] = !empty($options['blanktarget']); 1260 1261 // Calculate best context. 1262 if (empty($CFG->version) or $CFG->version < 2013051400 or during_initial_install()) { 1263 // Do not filter anything during installation or before upgrade completes. 1264 $context = null; 1265 1266 } else if (isset($options['context'])) { // First by explicit passed context option. 1267 if (is_object($options['context'])) { 1268 $context = $options['context']; 1269 } else { 1270 $context = context::instance_by_id($options['context']); 1271 } 1272 } else if ($courseiddonotuse) { 1273 // Legacy courseid. 1274 $context = context_course::instance($courseiddonotuse); 1275 } else { 1276 // Fallback to $PAGE->context this may be problematic in CLI and other non-standard pages :-(. 1277 $context = $PAGE->context; 1278 } 1279 1280 if (!$context) { 1281 // Either install/upgrade or something has gone really wrong because context does not exist (yet?). 1282 $options['nocache'] = true; 1283 $options['filter'] = false; 1284 } 1285 1286 if ($options['filter']) { 1287 $filtermanager = filter_manager::instance(); 1288 $filtermanager->setup_page_for_filters($PAGE, $context); // Setup global stuff filters may have. 1289 $filteroptions = array( 1290 'originalformat' => $format, 1291 'noclean' => $options['noclean'], 1292 ); 1293 } else { 1294 $filtermanager = new null_filter_manager(); 1295 $filteroptions = array(); 1296 } 1297 1298 switch ($format) { 1299 case FORMAT_HTML: 1300 if (!$options['noclean']) { 1301 $text = clean_text($text, FORMAT_HTML, $options); 1302 } 1303 $text = $filtermanager->filter_text($text, $context, $filteroptions); 1304 break; 1305 1306 case FORMAT_PLAIN: 1307 $text = s($text); // Cleans dangerous JS. 1308 $text = rebuildnolinktag($text); 1309 $text = str_replace(' ', ' ', $text); 1310 $text = nl2br($text); 1311 break; 1312 1313 case FORMAT_WIKI: 1314 // This format is deprecated. 1315 $text = '<p>NOTICE: Wiki-like formatting has been removed from Moodle. You should not be seeing 1316 this message as all texts should have been converted to Markdown format instead. 1317 Please post a bug report to http://moodle.org/bugs with information about where you 1318 saw this message.</p>'.s($text); 1319 break; 1320 1321 case FORMAT_MARKDOWN: 1322 $text = markdown_to_html($text); 1323 if (!$options['noclean']) { 1324 $text = clean_text($text, FORMAT_HTML, $options); 1325 } 1326 $text = $filtermanager->filter_text($text, $context, $filteroptions); 1327 break; 1328 1329 default: // FORMAT_MOODLE or anything else. 1330 $text = text_to_html($text, null, $options['para'], $options['newlines']); 1331 if (!$options['noclean']) { 1332 $text = clean_text($text, FORMAT_HTML, $options); 1333 } 1334 $text = $filtermanager->filter_text($text, $context, $filteroptions); 1335 break; 1336 } 1337 if ($options['filter']) { 1338 // At this point there should not be any draftfile links any more, 1339 // this happens when developers forget to post process the text. 1340 // The only potential problem is that somebody might try to format 1341 // the text before storing into database which would be itself big bug.. 1342 $text = str_replace("\"$CFG->wwwroot/draftfile.php", "\"$CFG->wwwroot/brokenfile.php#", $text); 1343 1344 if ($CFG->debugdeveloper) { 1345 if (strpos($text, '@@PLUGINFILE@@/') !== false) { 1346 debugging('Before calling format_text(), the content must be processed with file_rewrite_pluginfile_urls()', 1347 DEBUG_DEVELOPER); 1348 } 1349 } 1350 } 1351 1352 if (!empty($options['overflowdiv'])) { 1353 $text = html_writer::tag('div', $text, array('class' => 'no-overflow')); 1354 } 1355 1356 if ($options['blanktarget']) { 1357 $domdoc = new DOMDocument(); 1358 libxml_use_internal_errors(true); 1359 $domdoc->loadHTML('<?xml version="1.0" encoding="UTF-8" ?>' . $text); 1360 libxml_clear_errors(); 1361 foreach ($domdoc->getElementsByTagName('a') as $link) { 1362 if ($link->hasAttribute('target') && strpos($link->getAttribute('target'), '_blank') === false) { 1363 continue; 1364 } 1365 $link->setAttribute('target', '_blank'); 1366 if (strpos($link->getAttribute('rel'), 'noreferrer') === false) { 1367 $link->setAttribute('rel', trim($link->getAttribute('rel') . ' noreferrer')); 1368 } 1369 } 1370 1371 // This regex is nasty and I don't like it. The correct way to solve this is by loading the HTML like so: 1372 // $domdoc->loadHTML($text, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD); however it seems like the libxml 1373 // version that travis uses doesn't work properly and ends up leaving <html><body>, so I'm forced to use 1374 // this regex to remove those tags. 1375 $text = trim(preg_replace('~<(?:!DOCTYPE|/?(?:html|body))[^>]*>\s*~i', '', $domdoc->saveHTML($domdoc->documentElement))); 1376 } 1377 1378 return $text; 1379 } 1380 1381 /** 1382 * Resets some data related to filters, called during upgrade or when general filter settings change. 1383 * 1384 * @param bool $phpunitreset true means called from our PHPUnit integration test reset 1385 * @return void 1386 */ 1387 function reset_text_filters_cache($phpunitreset = false) { 1388 global $CFG, $DB; 1389 1390 if ($phpunitreset) { 1391 // HTMLPurifier does not change, DB is already reset to defaults, 1392 // nothing to do here, the dataroot was cleared too. 1393 return; 1394 } 1395 1396 // The purge_all_caches() deals with cachedir and localcachedir purging, 1397 // the individual filter caches are invalidated as necessary elsewhere. 1398 1399 // Update $CFG->filterall cache flag. 1400 if (empty($CFG->stringfilters)) { 1401 set_config('filterall', 0); 1402 return; 1403 } 1404 $installedfilters = core_component::get_plugin_list('filter'); 1405 $filters = explode(',', $CFG->stringfilters); 1406 foreach ($filters as $filter) { 1407 if (isset($installedfilters[$filter])) { 1408 set_config('filterall', 1); 1409 return; 1410 } 1411 } 1412 set_config('filterall', 0); 1413 } 1414 1415 /** 1416 * Given a simple string, this function returns the string 1417 * processed by enabled string filters if $CFG->filterall is enabled 1418 * 1419 * This function should be used to print short strings (non html) that 1420 * need filter processing e.g. activity titles, post subjects, 1421 * glossary concepts. 1422 * 1423 * @staticvar bool $strcache 1424 * @param string $string The string to be filtered. Should be plain text, expect 1425 * possibly for multilang tags. 1426 * @param boolean $striplinks To strip any link in the result text. Moodle 1.8 default changed from false to true! MDL-8713 1427 * @param array $options options array/object or courseid 1428 * @return string 1429 */ 1430 function format_string($string, $striplinks = true, $options = null) { 1431 global $CFG, $PAGE; 1432 1433 // We'll use a in-memory cache here to speed up repeated strings. 1434 static $strcache = false; 1435 1436 if (empty($CFG->version) or $CFG->version < 2013051400 or during_initial_install()) { 1437 // Do not filter anything during installation or before upgrade completes. 1438 return $string = strip_tags($string); 1439 } 1440 1441 if ($strcache === false or count($strcache) > 2000) { 1442 // This number might need some tuning to limit memory usage in cron. 1443 $strcache = array(); 1444 } 1445 1446 if (is_numeric($options)) { 1447 // Legacy courseid usage. 1448 $options = array('context' => context_course::instance($options)); 1449 } else { 1450 // Detach object, we can not modify it. 1451 $options = (array)$options; 1452 } 1453 1454 if (empty($options['context'])) { 1455 // Fallback to $PAGE->context this may be problematic in CLI and other non-standard pages :-(. 1456 $options['context'] = $PAGE->context; 1457 } else if (is_numeric($options['context'])) { 1458 $options['context'] = context::instance_by_id($options['context']); 1459 } 1460 if (!isset($options['filter'])) { 1461 $options['filter'] = true; 1462 } 1463 1464 $options['escape'] = !isset($options['escape']) || $options['escape']; 1465 1466 if (!$options['context']) { 1467 // We did not find any context? weird. 1468 return $string = strip_tags($string); 1469 } 1470 1471 // Calculate md5. 1472 $cachekeys = array($string, $striplinks, $options['context']->id, 1473 $options['escape'], current_language(), $options['filter']); 1474 $md5 = md5(implode('<+>', $cachekeys)); 1475 1476 // Fetch from cache if possible. 1477 if (isset($strcache[$md5])) { 1478 return $strcache[$md5]; 1479 } 1480 1481 // First replace all ampersands not followed by html entity code 1482 // Regular expression moved to its own method for easier unit testing. 1483 $string = $options['escape'] ? replace_ampersands_not_followed_by_entity($string) : $string; 1484 1485 if (!empty($CFG->filterall) && $options['filter']) { 1486 $filtermanager = filter_manager::instance(); 1487 $filtermanager->setup_page_for_filters($PAGE, $options['context']); // Setup global stuff filters may have. 1488 $string = $filtermanager->filter_string($string, $options['context']); 1489 } 1490 1491 // If the site requires it, strip ALL tags from this string. 1492 if (!empty($CFG->formatstringstriptags)) { 1493 if ($options['escape']) { 1494 $string = str_replace(array('<', '>'), array('<', '>'), strip_tags($string)); 1495 } else { 1496 $string = strip_tags($string); 1497 } 1498 } else { 1499 // Otherwise strip just links if that is required (default). 1500 if ($striplinks) { 1501 // Strip links in string. 1502 $string = strip_links($string); 1503 } 1504 $string = clean_text($string); 1505 } 1506 1507 // Store to cache. 1508 $strcache[$md5] = $string; 1509 1510 return $string; 1511 } 1512 1513 /** 1514 * Given a string, performs a negative lookahead looking for any ampersand character 1515 * that is not followed by a proper HTML entity. If any is found, it is replaced 1516 * by &. The string is then returned. 1517 * 1518 * @param string $string 1519 * @return string 1520 */ 1521 function replace_ampersands_not_followed_by_entity($string) { 1522 return preg_replace("/\&(?![a-zA-Z0-9#]{1,8};)/", "&", $string); 1523 } 1524 1525 /** 1526 * Given a string, replaces all <a>.*</a> by .* and returns the string. 1527 * 1528 * @param string $string 1529 * @return string 1530 */ 1531 function strip_links($string) { 1532 return preg_replace('/(<a\s[^>]+?>)(.+?)(<\/a>)/is', '$2', $string); 1533 } 1534 1535 /** 1536 * This expression turns links into something nice in a text format. (Russell Jungwirth) 1537 * 1538 * @param string $string 1539 * @return string 1540 */ 1541 function wikify_links($string) { 1542 return preg_replace('~(<a [^<]*href=["|\']?([^ "\']*)["|\']?[^>]*>([^<]*)</a>)~i', '$3 [ $2 ]', $string); 1543 } 1544 1545 /** 1546 * Given text in a variety of format codings, this function returns the text as plain text suitable for plain email. 1547 * 1548 * @param string $text The text to be formatted. This is raw text originally from user input. 1549 * @param int $format Identifier of the text format to be used 1550 * [FORMAT_MOODLE, FORMAT_HTML, FORMAT_PLAIN, FORMAT_WIKI, FORMAT_MARKDOWN] 1551 * @return string 1552 */ 1553 function format_text_email($text, $format) { 1554 1555 switch ($format) { 1556 1557 case FORMAT_PLAIN: 1558 return $text; 1559 break; 1560 1561 case FORMAT_WIKI: 1562 // There should not be any of these any more! 1563 $text = wikify_links($text); 1564 return core_text::entities_to_utf8(strip_tags($text), true); 1565 break; 1566 1567 case FORMAT_HTML: 1568 return html_to_text($text); 1569 break; 1570 1571 case FORMAT_MOODLE: 1572 case FORMAT_MARKDOWN: 1573 default: 1574 $text = wikify_links($text); 1575 return core_text::entities_to_utf8(strip_tags($text), true); 1576 break; 1577 } 1578 } 1579 1580 /** 1581 * Formats activity intro text 1582 * 1583 * @param string $module name of module 1584 * @param object $activity instance of activity 1585 * @param int $cmid course module id 1586 * @param bool $filter filter resulting html text 1587 * @return string 1588 */ 1589 function format_module_intro($module, $activity, $cmid, $filter=true) { 1590 global $CFG; 1591 require_once("$CFG->libdir/filelib.php"); 1592 $context = context_module::instance($cmid); 1593 $options = array('noclean' => true, 'para' => false, 'filter' => $filter, 'context' => $context, 'overflowdiv' => true); 1594 $intro = file_rewrite_pluginfile_urls($activity->intro, 'pluginfile.php', $context->id, 'mod_'.$module, 'intro', null); 1595 return trim(format_text($intro, $activity->introformat, $options, null)); 1596 } 1597 1598 /** 1599 * Removes the usage of Moodle files from a text. 1600 * 1601 * In some rare cases we need to re-use a text that already has embedded links 1602 * to some files hosted within Moodle. But the new area in which we will push 1603 * this content does not support files... therefore we need to remove those files. 1604 * 1605 * @param string $source The text 1606 * @return string The stripped text 1607 */ 1608 function strip_pluginfile_content($source) { 1609 $baseurl = '@@PLUGINFILE@@'; 1610 // Looking for something like < .* "@@pluginfile@@.*" .* > 1611 $pattern = '$<[^<>]+["\']' . $baseurl . '[^"\']*["\'][^<>]*>$'; 1612 $stripped = preg_replace($pattern, '', $source); 1613 // Use purify html to rebalence potentially mismatched tags and generally cleanup. 1614 return purify_html($stripped); 1615 } 1616 1617 /** 1618 * Legacy function, used for cleaning of old forum and glossary text only. 1619 * 1620 * @param string $text text that may contain legacy TRUSTTEXT marker 1621 * @return string text without legacy TRUSTTEXT marker 1622 */ 1623 function trusttext_strip($text) { 1624 if (!is_string($text)) { 1625 // This avoids the potential for an endless loop below. 1626 throw new coding_exception('trusttext_strip parameter must be a string'); 1627 } 1628 while (true) { // Removing nested TRUSTTEXT. 1629 $orig = $text; 1630 $text = str_replace('#####TRUSTTEXT#####', '', $text); 1631 if (strcmp($orig, $text) === 0) { 1632 return $text; 1633 } 1634 } 1635 } 1636 1637 /** 1638 * Must be called before editing of all texts with trust flag. Removes all XSS nasties from texts stored in database if needed. 1639 * 1640 * @param stdClass $object data object with xxx, xxxformat and xxxtrust fields 1641 * @param string $field name of text field 1642 * @param context $context active context 1643 * @return stdClass updated $object 1644 */ 1645 function trusttext_pre_edit($object, $field, $context) { 1646 $trustfield = $field.'trust'; 1647 $formatfield = $field.'format'; 1648 1649 if (!$object->$trustfield or !trusttext_trusted($context)) { 1650 $object->$field = clean_text($object->$field, $object->$formatfield); 1651 } 1652 1653 return $object; 1654 } 1655 1656 /** 1657 * Is current user trusted to enter no dangerous XSS in this context? 1658 * 1659 * Please note the user must be in fact trusted everywhere on this server!! 1660 * 1661 * @param context $context 1662 * @return bool true if user trusted 1663 */ 1664 function trusttext_trusted($context) { 1665 return (trusttext_active() and has_capability('moodle/site:trustcontent', $context)); 1666 } 1667 1668 /** 1669 * Is trusttext feature active? 1670 * 1671 * @return bool 1672 */ 1673 function trusttext_active() { 1674 global $CFG; 1675 1676 return !empty($CFG->enabletrusttext); 1677 } 1678 1679 /** 1680 * Cleans raw text removing nasties. 1681 * 1682 * Given raw text (eg typed in by a user) this function cleans it up and removes any nasty tags that could mess up 1683 * Moodle pages through XSS attacks. 1684 * 1685 * The result must be used as a HTML text fragment, this function can not cleanup random 1686 * parts of html tags such as url or src attributes. 1687 * 1688 * NOTE: the format parameter was deprecated because we can safely clean only HTML. 1689 * 1690 * @param string $text The text to be cleaned 1691 * @param int|string $format deprecated parameter, should always contain FORMAT_HTML or FORMAT_MOODLE 1692 * @param array $options Array of options; currently only option supported is 'allowid' (if true, 1693 * does not remove id attributes when cleaning) 1694 * @return string The cleaned up text 1695 */ 1696 function clean_text($text, $format = FORMAT_HTML, $options = array()) { 1697 $text = (string)$text; 1698 1699 if ($format != FORMAT_HTML and $format != FORMAT_HTML) { 1700 // TODO: we need to standardise cleanup of text when loading it into editor first. 1701 // debugging('clean_text() is designed to work only with html');. 1702 } 1703 1704 if ($format == FORMAT_PLAIN) { 1705 return $text; 1706 } 1707 1708 if (is_purify_html_necessary($text)) { 1709 $text = purify_html($text, $options); 1710 } 1711 1712 // Originally we tried to neutralise some script events here, it was a wrong approach because 1713 // it was trivial to work around that (for example using style based XSS exploits). 1714 // We must not give false sense of security here - all developers MUST understand how to use 1715 // rawurlencode(), htmlentities(), htmlspecialchars(), p(), s(), moodle_url, html_writer and friends!!! 1716 1717 return $text; 1718 } 1719 1720 /** 1721 * Is it necessary to use HTMLPurifier? 1722 * 1723 * @private 1724 * @param string $text 1725 * @return bool false means html is safe and valid, true means use HTMLPurifier 1726 */ 1727 function is_purify_html_necessary($text) { 1728 if ($text === '') { 1729 return false; 1730 } 1731 1732 if ($text === (string)((int)$text)) { 1733 return false; 1734 } 1735 1736 if (strpos($text, '&') !== false or preg_match('|<[^pesb/]|', $text)) { 1737 // We need to normalise entities or other tags except p, em, strong and br present. 1738 return true; 1739 } 1740 1741 $altered = htmlspecialchars($text, ENT_NOQUOTES, 'UTF-8', true); 1742 if ($altered === $text) { 1743 // No < > or other special chars means this must be safe. 1744 return false; 1745 } 1746 1747 // Let's try to convert back some safe html tags. 1748 $altered = preg_replace('|<p>(.*?)</p>|m', '<p>$1</p>', $altered); 1749 if ($altered === $text) { 1750 return false; 1751 } 1752 $altered = preg_replace('|<em>([^<>]+?)</em>|m', '<em>$1</em>', $altered); 1753 if ($altered === $text) { 1754 return false; 1755 } 1756 $altered = preg_replace('|<strong>([^<>]+?)</strong>|m', '<strong>$1</strong>', $altered); 1757 if ($altered === $text) { 1758 return false; 1759 } 1760 $altered = str_replace('<br />', '<br />', $altered); 1761 if ($altered === $text) { 1762 return false; 1763 } 1764 1765 return true; 1766 } 1767 1768 /** 1769 * KSES replacement cleaning function - uses HTML Purifier. 1770 * 1771 * @param string $text The (X)HTML string to purify 1772 * @param array $options Array of options; currently only option supported is 'allowid' (if set, 1773 * does not remove id attributes when cleaning) 1774 * @return string 1775 */ 1776 function purify_html($text, $options = array()) { 1777 global $CFG; 1778 1779 $text = (string)$text; 1780 1781 static $purifiers = array(); 1782 static $caches = array(); 1783 1784 // Purifier code can change only during major version upgrade. 1785 $version = empty($CFG->version) ? 0 : $CFG->version; 1786 $cachedir = "$CFG->localcachedir/htmlpurifier/$version"; 1787 if (!file_exists($cachedir)) { 1788 // Purging of caches may remove the cache dir at any time, 1789 // luckily file_exists() results should be cached for all existing directories. 1790 $purifiers = array(); 1791 $caches = array(); 1792 gc_collect_cycles(); 1793 1794 make_localcache_directory('htmlpurifier', false); 1795 check_dir_exists($cachedir); 1796 } 1797 1798 $allowid = empty($options['allowid']) ? 0 : 1; 1799 $allowobjectembed = empty($CFG->allowobjectembed) ? 0 : 1; 1800 1801 $type = 'type_'.$allowid.'_'.$allowobjectembed; 1802 1803 if (!array_key_exists($type, $caches)) { 1804 $caches[$type] = cache::make('core', 'htmlpurifier', array('type' => $type)); 1805 } 1806 $cache = $caches[$type]; 1807 1808 // Add revision number and all options to the text key so that it is compatible with local cluster node caches. 1809 $key = "|$version|$allowobjectembed|$allowid|$text"; 1810 $filteredtext = $cache->get($key); 1811 1812 if ($filteredtext === true) { 1813 // The filtering did not change the text last time, no need to filter anything again. 1814 return $text; 1815 } else if ($filteredtext !== false) { 1816 return $filteredtext; 1817 } 1818 1819 if (empty($purifiers[$type])) { 1820 require_once $CFG->libdir.'/htmlpurifier/HTMLPurifier.safe-includes.php'; 1821 require_once $CFG->libdir.'/htmlpurifier/locallib.php'; 1822 $config = HTMLPurifier_Config::createDefault(); 1823 1824 $config->set('HTML.DefinitionID', 'moodlehtml'); 1825 $config->set('HTML.DefinitionRev', 6); 1826 $config->set('Cache.SerializerPath', $cachedir); 1827 $config->set('Cache.SerializerPermissions', $CFG->directorypermissions); 1828 $config->set('Core.NormalizeNewlines', false); 1829 $config->set('Core.ConvertDocumentToFragment', true); 1830 $config->set('Core.Encoding', 'UTF-8'); 1831 $config->set('HTML.Doctype', 'XHTML 1.0 Transitional'); 1832 $config->set('URI.AllowedSchemes', array( 1833 'http' => true, 1834 'https' => true, 1835 'ftp' => true, 1836 'irc' => true, 1837 'nntp' => true, 1838 'news' => true, 1839 'rtsp' => true, 1840 'rtmp' => true, 1841 'teamspeak' => true, 1842 'gopher' => true, 1843 'mms' => true, 1844 'mailto' => true 1845 )); 1846 $config->set('Attr.AllowedFrameTargets', array('_blank')); 1847 1848 if ($allowobjectembed) { 1849 $config->set('HTML.SafeObject', true); 1850 $config->set('Output.FlashCompat', true); 1851 $config->set('HTML.SafeEmbed', true); 1852 } 1853 1854 if ($allowid) { 1855 $config->set('Attr.EnableID', true); 1856 } 1857 1858 if ($def = $config->maybeGetRawHTMLDefinition()) { 1859 $def->addElement('nolink', 'Inline', 'Flow', array()); // Skip our filters inside. 1860 $def->addElement('tex', 'Inline', 'Inline', array()); // Tex syntax, equivalent to $$xx$$. 1861 $def->addElement('algebra', 'Inline', 'Inline', array()); // Algebra syntax, equivalent to @@xx@@. 1862 $def->addElement('lang', 'Block', 'Flow', array(), array('lang'=>'CDATA')); // Original multilang style - only our hacked lang attribute. 1863 $def->addAttribute('span', 'xxxlang', 'CDATA'); // Current very problematic multilang. 1864 1865 // Media elements. 1866 // https://html.spec.whatwg.org/#the-video-element 1867 $def->addElement('video', 'Block', 'Optional: #PCDATA | Flow | source | track', 'Common', [ 1868 'src' => 'URI', 1869 'crossorigin' => 'Enum#anonymous,use-credentials', 1870 'poster' => 'URI', 1871 'preload' => 'Enum#auto,metadata,none', 1872 'autoplay' => 'Bool', 1873 'playsinline' => 'Bool', 1874 'loop' => 'Bool', 1875 'muted' => 'Bool', 1876 'controls' => 'Bool', 1877 'width' => 'Length', 1878 'height' => 'Length', 1879 ]); 1880 // https://html.spec.whatwg.org/#the-audio-element 1881 $def->addElement('audio', 'Block', 'Optional: #PCDATA | Flow | source | track', 'Common', [ 1882 'src' => 'URI', 1883 'crossorigin' => 'Enum#anonymous,use-credentials', 1884 'preload' => 'Enum#auto,metadata,none', 1885 'autoplay' => 'Bool', 1886 'loop' => 'Bool', 1887 'muted' => 'Bool', 1888 'controls' => 'Bool' 1889 ]); 1890 // https://html.spec.whatwg.org/#the-source-element 1891 $def->addElement('source', false, 'Empty', null, [ 1892 'src' => 'URI', 1893 'type' => 'Text' 1894 ]); 1895 // https://html.spec.whatwg.org/#the-track-element 1896 $def->addElement('track', false, 'Empty', null, [ 1897 'src' => 'URI', 1898 'kind' => 'Enum#subtitles,captions,descriptions,chapters,metadata', 1899 'srclang' => 'Text', 1900 'label' => 'Text', 1901 'default' => 'Bool', 1902 ]); 1903 1904 // Use the built-in Ruby module to add annotation support. 1905 $def->manager->addModule(new HTMLPurifier_HTMLModule_Ruby()); 1906 } 1907 1908 $purifier = new HTMLPurifier($config); 1909 $purifiers[$type] = $purifier; 1910 } else { 1911 $purifier = $purifiers[$type]; 1912 } 1913 1914 $multilang = (strpos($text, 'class="multilang"') !== false); 1915 1916 $filteredtext = $text; 1917 if ($multilang) { 1918 $filteredtextregex = '/<span(\s+lang="([a-zA-Z0-9_-]+)"|\s+class="multilang"){2}\s*>/'; 1919 $filteredtext = preg_replace($filteredtextregex, '<span xxxlang="$2}">', $filteredtext); 1920 } 1921 $filteredtext = (string)$purifier->purify($filteredtext); 1922 if ($multilang) { 1923 $filteredtext = preg_replace('/<span xxxlang="([a-zA-Z0-9_-]+)">/', '<span lang="$1}" class="multilang">', $filteredtext); 1924 } 1925 1926 if ($text === $filteredtext) { 1927 // No need to store the filtered text, next time we will just return unfiltered text 1928 // because it was not changed by purifying. 1929 $cache->set($key, true); 1930 } else { 1931 $cache->set($key, $filteredtext); 1932 } 1933 1934 return $filteredtext; 1935 } 1936 1937 /** 1938 * Given plain text, makes it into HTML as nicely as possible. 1939 * 1940 * May contain HTML tags already. 1941 * 1942 * Do not abuse this function. It is intended as lower level formatting feature used 1943 * by {@link format_text()} to convert FORMAT_MOODLE to HTML. You are supposed 1944 * to call format_text() in most of cases. 1945 * 1946 * @param string $text The string to convert. 1947 * @param boolean $smileyignored Was used to determine if smiley characters should convert to smiley images, ignored now 1948 * @param boolean $para If true then the returned string will be wrapped in div tags 1949 * @param boolean $newlines If true then lines newline breaks will be converted to HTML newline breaks. 1950 * @return string 1951 */ 1952 function text_to_html($text, $smileyignored = null, $para = true, $newlines = true) { 1953 // Remove any whitespace that may be between HTML tags. 1954 $text = preg_replace("~>([[:space:]]+)<~i", "><", $text); 1955 1956 // Remove any returns that precede or follow HTML tags. 1957 $text = preg_replace("~([\n\r])<~i", " <", $text); 1958 $text = preg_replace("~>([\n\r])~i", "> ", $text); 1959 1960 // Make returns into HTML newlines. 1961 if ($newlines) { 1962 $text = nl2br($text); 1963 } 1964 1965 // Wrap the whole thing in a div if required. 1966 if ($para) { 1967 // In 1.9 this was changed from a p => div. 1968 return '<div class="text_to_html">'.$text.'</div>'; 1969 } else { 1970 return $text; 1971 } 1972 } 1973 1974 /** 1975 * Given Markdown formatted text, make it into XHTML using external function 1976 * 1977 * @param string $text The markdown formatted text to be converted. 1978 * @return string Converted text 1979 */ 1980 function markdown_to_html($text) { 1981 global $CFG; 1982 1983 if ($text === '' or $text === null) { 1984 return $text; 1985 } 1986 1987 require_once($CFG->libdir .'/markdown/MarkdownInterface.php'); 1988 require_once($CFG->libdir .'/markdown/Markdown.php'); 1989 require_once($CFG->libdir .'/markdown/MarkdownExtra.php'); 1990 1991 return \Michelf\MarkdownExtra::defaultTransform($text); 1992 } 1993 1994 /** 1995 * Given HTML text, make it into plain text using external function 1996 * 1997 * @param string $html The text to be converted. 1998 * @param integer $width Width to wrap the text at. (optional, default 75 which 1999 * is a good value for email. 0 means do not limit line length.) 2000 * @param boolean $dolinks By default, any links in the HTML are collected, and 2001 * printed as a list at the end of the HTML. If you don't want that, set this 2002 * argument to false. 2003 * @return string plain text equivalent of the HTML. 2004 */ 2005 function html_to_text($html, $width = 75, $dolinks = true) { 2006 global $CFG; 2007 2008 require_once($CFG->libdir .'/html2text/lib.php'); 2009 2010 $options = array( 2011 'width' => $width, 2012 'do_links' => 'table', 2013 ); 2014 2015 if (empty($dolinks)) { 2016 $options['do_links'] = 'none'; 2017 } 2018 $h2t = new core_html2text($html, $options); 2019 $result = $h2t->getText(); 2020 2021 return $result; 2022 } 2023 2024 /** 2025 * Converts texts or strings to plain text. 2026 * 2027 * - When used to convert user input introduced in an editor the text format needs to be passed in $contentformat like we usually 2028 * do in format_text. 2029 * - When this function is used for strings that are usually passed through format_string before displaying them 2030 * we need to set $contentformat to false. This will execute html_to_text as these strings can contain multilang tags if 2031 * multilang filter is applied to headings. 2032 * 2033 * @param string $content The text as entered by the user 2034 * @param int|false $contentformat False for strings or the text format: FORMAT_MOODLE/FORMAT_HTML/FORMAT_PLAIN/FORMAT_MARKDOWN 2035 * @return string Plain text. 2036 */ 2037 function content_to_text($content, $contentformat) { 2038 2039 switch ($contentformat) { 2040 case FORMAT_PLAIN: 2041 // Nothing here. 2042 break; 2043 case FORMAT_MARKDOWN: 2044 $content = markdown_to_html($content); 2045 $content = html_to_text($content, 75, false); 2046 break; 2047 default: 2048 // FORMAT_HTML, FORMAT_MOODLE and $contentformat = false, the later one are strings usually formatted through 2049 // format_string, we need to convert them from html because they can contain HTML (multilang filter). 2050 $content = html_to_text($content, 75, false); 2051 } 2052 2053 return trim($content, "\r\n "); 2054 } 2055 2056 /** 2057 * Factory method for extracting draft file links from arbitrary text using regular expressions. Only text 2058 * is required; other file fields may be passed to filter. 2059 * 2060 * @param string $text Some html content. 2061 * @param bool $forcehttps force https urls. 2062 * @param int $contextid This parameter and the next three identify the file area to save to. 2063 * @param string $component The component name. 2064 * @param string $filearea The filearea. 2065 * @param int $itemid The item id for the filearea. 2066 * @param string $filename The specific filename of the file. 2067 * @return array 2068 */ 2069 function extract_draft_file_urls_from_text($text, $forcehttps = false, $contextid = null, $component = null, 2070 $filearea = null, $itemid = null, $filename = null) { 2071 global $CFG; 2072 2073 $wwwroot = $CFG->wwwroot; 2074 if ($forcehttps) { 2075 $wwwroot = str_replace('http://', 'https://', $wwwroot); 2076 } 2077 $urlstring = '/' . preg_quote($wwwroot, '/'); 2078 2079 $urlbase = preg_quote('draftfile.php'); 2080 $urlstring .= "\/(?<urlbase>{$urlbase})"; 2081 2082 if (is_null($contextid)) { 2083 $contextid = '[0-9]+'; 2084 } 2085 $urlstring .= "\/(?<contextid>{$contextid})"; 2086 2087 if (is_null($component)) { 2088 $component = '[a-z_]+'; 2089 } 2090 $urlstring .= "\/(?<component>{$component})"; 2091 2092 if (is_null($filearea)) { 2093 $filearea = '[a-z_]+'; 2094 } 2095 $urlstring .= "\/(?<filearea>{$filearea})"; 2096 2097 if (is_null($itemid)) { 2098 $itemid = '[0-9]+'; 2099 } 2100 $urlstring .= "\/(?<itemid>{$itemid})"; 2101 2102 // Filename matching magic based on file_rewrite_urls_to_pluginfile(). 2103 if (is_null($filename)) { 2104 $filename = '[^\'\",&<>|`\s:\\\\]+'; 2105 } 2106 $urlstring .= "\/(?<filename>{$filename})/"; 2107 2108 // Regular expression which matches URLs and returns their components. 2109 preg_match_all($urlstring, $text, $urls, PREG_SET_ORDER); 2110 return $urls; 2111 } 2112 2113 /** 2114 * This function will highlight search words in a given string 2115 * 2116 * It cares about HTML and will not ruin links. It's best to use 2117 * this function after performing any conversions to HTML. 2118 * 2119 * @param string $needle The search string. Syntax like "word1 +word2 -word3" is dealt with correctly. 2120 * @param string $haystack The string (HTML) within which to highlight the search terms. 2121 * @param boolean $matchcase whether to do case-sensitive. Default case-insensitive. 2122 * @param string $prefix the string to put before each search term found. 2123 * @param string $suffix the string to put after each search term found. 2124 * @return string The highlighted HTML. 2125 */ 2126 function highlight($needle, $haystack, $matchcase = false, 2127 $prefix = '<span class="highlight">', $suffix = '</span>') { 2128 2129 // Quick bail-out in trivial cases. 2130 if (empty($needle) or empty($haystack)) { 2131 return $haystack; 2132 } 2133 2134 // Break up the search term into words, discard any -words and build a regexp. 2135 $words = preg_split('/ +/', trim($needle)); 2136 foreach ($words as $index => $word) { 2137 if (strpos($word, '-') === 0) { 2138 unset($words[$index]); 2139 } else if (strpos($word, '+') === 0) { 2140 $words[$index] = '\b' . preg_quote(ltrim($word, '+'), '/') . '\b'; // Match only as a complete word. 2141 } else { 2142 $words[$index] = preg_quote($word, '/'); 2143 } 2144 } 2145 $regexp = '/(' . implode('|', $words) . ')/u'; // Char u is to do UTF-8 matching. 2146 if (!$matchcase) { 2147 $regexp .= 'i'; 2148 } 2149 2150 // Another chance to bail-out if $search was only -words. 2151 if (empty($words)) { 2152 return $haystack; 2153 } 2154 2155 // Split the string into HTML tags and real content. 2156 $chunks = preg_split('/((?:<[^>]*>)+)/', $haystack, -1, PREG_SPLIT_DELIM_CAPTURE); 2157 2158 // We have an array of alternating blocks of text, then HTML tags, then text, ... 2159 // Loop through replacing search terms in the text, and leaving the HTML unchanged. 2160 $ishtmlchunk = false; 2161 $result = ''; 2162 foreach ($chunks as $chunk) { 2163 if ($ishtmlchunk) { 2164 $result .= $chunk; 2165 } else { 2166 $result .= preg_replace($regexp, $prefix . '$1' . $suffix, $chunk); 2167 } 2168 $ishtmlchunk = !$ishtmlchunk; 2169 } 2170 2171 return $result; 2172 } 2173 2174 /** 2175 * This function will highlight instances of $needle in $haystack 2176 * 2177 * It's faster that the above function {@link highlight()} and doesn't care about 2178 * HTML or anything. 2179 * 2180 * @param string $needle The string to search for 2181 * @param string $haystack The string to search for $needle in 2182 * @return string The highlighted HTML 2183 */ 2184 function highlightfast($needle, $haystack) { 2185 2186 if (empty($needle) or empty($haystack)) { 2187 return $haystack; 2188 } 2189 2190 $parts = explode(core_text::strtolower($needle), core_text::strtolower($haystack)); 2191 2192 if (count($parts) === 1) { 2193 return $haystack; 2194 } 2195 2196 $pos = 0; 2197 2198 foreach ($parts as $key => $part) { 2199 $parts[$key] = substr($haystack, $pos, strlen($part)); 2200 $pos += strlen($part); 2201 2202 $parts[$key] .= '<span class="highlight">'.substr($haystack, $pos, strlen($needle)).'</span>'; 2203 $pos += strlen($needle); 2204 } 2205 2206 return str_replace('<span class="highlight"></span>', '', join('', $parts)); 2207 } 2208 2209 /** 2210 * Return a string containing 'lang', xml:lang and optionally 'dir' HTML attributes. 2211 * 2212 * Internationalisation, for print_header and backup/restorelib. 2213 * 2214 * @param bool $dir Default false 2215 * @return string Attributes 2216 */ 2217 function get_html_lang($dir = false) { 2218 $direction = ''; 2219 if ($dir) { 2220 if (right_to_left()) { 2221 $direction = ' dir="rtl"'; 2222 } else { 2223 $direction = ' dir="ltr"'; 2224 } 2225 } 2226 // Accessibility: added the 'lang' attribute to $direction, used in theme <html> tag. 2227 $language = str_replace('_', '-', current_language()); 2228 @header('Content-Language: '.$language); 2229 return ($direction.' lang="'.$language.'" xml:lang="'.$language.'"'); 2230 } 2231 2232 2233 // STANDARD WEB PAGE PARTS. 2234 2235 /** 2236 * Send the HTTP headers that Moodle requires. 2237 * 2238 * There is a backwards compatibility hack for legacy code 2239 * that needs to add custom IE compatibility directive. 2240 * 2241 * Example: 2242 * <code> 2243 * if (!isset($CFG->additionalhtmlhead)) { 2244 * $CFG->additionalhtmlhead = ''; 2245 * } 2246 * $CFG->additionalhtmlhead .= '<meta http-equiv="X-UA-Compatible" content="IE=8" />'; 2247 * header('X-UA-Compatible: IE=8'); 2248 * echo $OUTPUT->header(); 2249 * </code> 2250 * 2251 * Please note the $CFG->additionalhtmlhead alone might not work, 2252 * you should send the IE compatibility header() too. 2253 * 2254 * @param string $contenttype 2255 * @param bool $cacheable Can this page be cached on back? 2256 * @return void, sends HTTP headers 2257 */ 2258 function send_headers($contenttype, $cacheable = true) { 2259 global $CFG; 2260 2261 @header('Content-Type: ' . $contenttype); 2262 @header('Content-Script-Type: text/javascript'); 2263 @header('Content-Style-Type: text/css'); 2264 2265 if (empty($CFG->additionalhtmlhead) or stripos($CFG->additionalhtmlhead, 'X-UA-Compatible') === false) { 2266 @header('X-UA-Compatible: IE=edge'); 2267 } 2268 2269 if ($cacheable) { 2270 // Allow caching on "back" (but not on normal clicks). 2271 @header('Cache-Control: private, pre-check=0, post-check=0, max-age=0, no-transform'); 2272 @header('Pragma: no-cache'); 2273 @header('Expires: '); 2274 } else { 2275 // Do everything we can to always prevent clients and proxies caching. 2276 @header('Cache-Control: no-store, no-cache, must-revalidate'); 2277 @header('Cache-Control: post-check=0, pre-check=0, no-transform', false); 2278 @header('Pragma: no-cache'); 2279 @header('Expires: Mon, 20 Aug 1969 09:23:00 GMT'); 2280 @header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT'); 2281 } 2282 @header('Accept-Ranges: none'); 2283 2284 // The Moodle app must be allowed to embed content always. 2285 if (empty($CFG->allowframembedding) && !core_useragent::is_moodle_app()) { 2286 @header('X-Frame-Options: sameorigin'); 2287 } 2288 2289 // If referrer policy is set, add a referrer header. 2290 if (!empty($CFG->referrerpolicy) && ($CFG->referrerpolicy !== 'default')) { 2291 @header('Referrer-Policy: ' . $CFG->referrerpolicy); 2292 } 2293 } 2294 2295 /** 2296 * Return the right arrow with text ('next'), and optionally embedded in a link. 2297 * 2298 * @param string $text HTML/plain text label (set to blank only for breadcrumb separator cases). 2299 * @param string $url An optional link to use in a surrounding HTML anchor. 2300 * @param bool $accesshide True if text should be hidden (for screen readers only). 2301 * @param string $addclass Additional class names for the link, or the arrow character. 2302 * @return string HTML string. 2303 */ 2304 function link_arrow_right($text, $url='', $accesshide=false, $addclass='', $addparams = []) { 2305 global $OUTPUT; // TODO: move to output renderer. 2306 $arrowclass = 'arrow '; 2307 if (!$url) { 2308 $arrowclass .= $addclass; 2309 } 2310 $arrow = '<span class="'.$arrowclass.'">'.$OUTPUT->rarrow().'</span>'; 2311 $htmltext = ''; 2312 if ($text) { 2313 $htmltext = '<span class="arrow_text">'.$text.'</span> '; 2314 if ($accesshide) { 2315 $htmltext = get_accesshide($htmltext); 2316 } 2317 } 2318 if ($url) { 2319 $class = 'arrow_link'; 2320 if ($addclass) { 2321 $class .= ' '.$addclass; 2322 } 2323 2324 $linkparams = [ 2325 'class' => $class, 2326 'href' => $url, 2327 'title' => preg_replace('/<.*?>/', '', $text), 2328 ]; 2329 2330 $linkparams += $addparams; 2331 2332 return html_writer::link($url, $htmltext . $arrow, $linkparams); 2333 } 2334 return $htmltext.$arrow; 2335 } 2336 2337 /** 2338 * Return the left arrow with text ('previous'), and optionally embedded in a link. 2339 * 2340 * @param string $text HTML/plain text label (set to blank only for breadcrumb separator cases). 2341 * @param string $url An optional link to use in a surrounding HTML anchor. 2342 * @param bool $accesshide True if text should be hidden (for screen readers only). 2343 * @param string $addclass Additional class names for the link, or the arrow character. 2344 * @return string HTML string. 2345 */ 2346 function link_arrow_left($text, $url='', $accesshide=false, $addclass='', $addparams = []) { 2347 global $OUTPUT; // TODO: move to utput renderer. 2348 $arrowclass = 'arrow '; 2349 if (! $url) { 2350 $arrowclass .= $addclass; 2351 } 2352 $arrow = '<span class="'.$arrowclass.'">'.$OUTPUT->larrow().'</span>'; 2353 $htmltext = ''; 2354 if ($text) { 2355 $htmltext = ' <span class="arrow_text">'.$text.'</span>'; 2356 if ($accesshide) { 2357 $htmltext = get_accesshide($htmltext); 2358 } 2359 } 2360 if ($url) { 2361 $class = 'arrow_link'; 2362 if ($addclass) { 2363 $class .= ' '.$addclass; 2364 } 2365 2366 $linkparams = [ 2367 'class' => $class, 2368 'href' => $url, 2369 'title' => preg_replace('/<.*?>/', '', $text), 2370 ]; 2371 2372 $linkparams += $addparams; 2373 2374 return html_writer::link($url, $arrow . $htmltext, $linkparams); 2375 } 2376 return $arrow.$htmltext; 2377 } 2378 2379 /** 2380 * Return a HTML element with the class "accesshide", for accessibility. 2381 * 2382 * Please use cautiously - where possible, text should be visible! 2383 * 2384 * @param string $text Plain text. 2385 * @param string $elem Lowercase element name, default "span". 2386 * @param string $class Additional classes for the element. 2387 * @param string $attrs Additional attributes string in the form, "name='value' name2='value2'" 2388 * @return string HTML string. 2389 */ 2390 function get_accesshide($text, $elem='span', $class='', $attrs='') { 2391 return "<$elem class=\"accesshide $class\" $attrs>$text</$elem>"; 2392 } 2393 2394 /** 2395 * Return the breadcrumb trail navigation separator. 2396 * 2397 * @return string HTML string. 2398 */ 2399 function get_separator() { 2400 // Accessibility: the 'hidden' slash is preferred for screen readers. 2401 return ' '.link_arrow_right($text='/', $url='', $accesshide=true, 'sep').' '; 2402 } 2403 2404 /** 2405 * Print (or return) a collapsible region, that has a caption that can be clicked to expand or collapse the region. 2406 * 2407 * If JavaScript is off, then the region will always be expanded. 2408 * 2409 * @param string $contents the contents of the box. 2410 * @param string $classes class names added to the div that is output. 2411 * @param string $id id added to the div that is output. Must not be blank. 2412 * @param string $caption text displayed at the top. Clicking on this will cause the region to expand or contract. 2413 * @param string $userpref the name of the user preference that stores the user's preferred default state. 2414 * (May be blank if you do not wish the state to be persisted. 2415 * @param boolean $default Initial collapsed state to use if the user_preference it not set. 2416 * @param boolean $return if true, return the HTML as a string, rather than printing it. 2417 * @return string|void If $return is false, returns nothing, otherwise returns a string of HTML. 2418 */ 2419 function print_collapsible_region($contents, $classes, $id, $caption, $userpref = '', $default = false, $return = false) { 2420 $output = print_collapsible_region_start($classes, $id, $caption, $userpref, $default, true); 2421 $output .= $contents; 2422 $output .= print_collapsible_region_end(true); 2423 2424 if ($return) { 2425 return $output; 2426 } else { 2427 echo $output; 2428 } 2429 } 2430 2431 /** 2432 * Print (or return) the start of a collapsible region 2433 * 2434 * The collapsibleregion has a caption that can be clicked to expand or collapse the region. If JavaScript is off, then the region 2435 * will always be expanded. 2436 * 2437 * @param string $classes class names added to the div that is output. 2438 * @param string $id id added to the div that is output. Must not be blank. 2439 * @param string $caption text displayed at the top. Clicking on this will cause the region to expand or contract. 2440 * @param string $userpref the name of the user preference that stores the user's preferred default state. 2441 * (May be blank if you do not wish the state to be persisted. 2442 * @param boolean $default Initial collapsed state to use if the user_preference it not set. 2443 * @param boolean $return if true, return the HTML as a string, rather than printing it. 2444 * @param string $extracontent the extra content will show next to caption, eg.Help icon. 2445 * @return string|void if $return is false, returns nothing, otherwise returns a string of HTML. 2446 */ 2447 function print_collapsible_region_start($classes, $id, $caption, $userpref = '', $default = false, $return = false, 2448 $extracontent = null) { 2449 global $PAGE; 2450 2451 // Work out the initial state. 2452 if (!empty($userpref) and is_string($userpref)) { 2453 user_preference_allow_ajax_update($userpref, PARAM_BOOL); 2454 $collapsed = get_user_preferences($userpref, $default); 2455 } else { 2456 $collapsed = $default; 2457 $userpref = false; 2458 } 2459 2460 if ($collapsed) { 2461 $classes .= ' collapsed'; 2462 } 2463 2464 $output = ''; 2465 $output .= '<div id="' . $id . '" class="collapsibleregion ' . $classes . '">'; 2466 $output .= '<div id="' . $id . '_sizer">'; 2467 $output .= '<div id="' . $id . '_caption" class="collapsibleregioncaption">'; 2468 $output .= $caption . ' </div>'; 2469 if ($extracontent) { 2470 $output .= html_writer::div($extracontent, 'collapsibleregionextracontent'); 2471 } 2472 $output .= '<div id="' . $id . '_inner" class="collapsibleregioninner">'; 2473 $PAGE->requires->js_init_call('M.util.init_collapsible_region', array($id, $userpref, get_string('clicktohideshow'))); 2474 2475 if ($return) { 2476 return $output; 2477 } else { 2478 echo $output; 2479 } 2480 } 2481 2482 /** 2483 * Close a region started with print_collapsible_region_start. 2484 * 2485 * @param boolean $return if true, return the HTML as a string, rather than printing it. 2486 * @return string|void if $return is false, returns nothing, otherwise returns a string of HTML. 2487 */ 2488 function print_collapsible_region_end($return = false) { 2489 $output = '</div></div></div>'; 2490 2491 if ($return) { 2492 return $output; 2493 } else { 2494 echo $output; 2495 } 2496 } 2497 2498 /** 2499 * Print a specified group's avatar. 2500 * 2501 * @param array|stdClass $group A single {@link group} object OR array of groups. 2502 * @param int $courseid The course ID. 2503 * @param boolean $large Default small picture, or large. 2504 * @param boolean $return If false print picture, otherwise return the output as string 2505 * @param boolean $link Enclose image in a link to view specified course? 2506 * @param boolean $includetoken Whether to use a user token when displaying this group image. 2507 * True indicates to generate a token for current user, and integer value indicates to generate a token for the 2508 * user whose id is the value indicated. 2509 * If the group picture is included in an e-mail or some other location where the audience is a specific 2510 * user who will not be logged in when viewing, then we use a token to authenticate the user. 2511 * @return string|void Depending on the setting of $return 2512 */ 2513 function print_group_picture($group, $courseid, $large = false, $return = false, $link = true, $includetoken = false) { 2514 global $CFG; 2515 2516 if (is_array($group)) { 2517 $output = ''; 2518 foreach ($group as $g) { 2519 $output .= print_group_picture($g, $courseid, $large, true, $link, $includetoken); 2520 } 2521 if ($return) { 2522 return $output; 2523 } else { 2524 echo $output; 2525 return; 2526 } 2527 } 2528 2529 $pictureurl = get_group_picture_url($group, $courseid, $large, $includetoken); 2530 2531 // If there is no picture, do nothing. 2532 if (!isset($pictureurl)) { 2533 return; 2534 } 2535 2536 $context = context_course::instance($courseid); 2537 2538 $groupname = s($group->name); 2539 $pictureimage = html_writer::img($pictureurl, $groupname, ['title' => $groupname]); 2540 2541 $output = ''; 2542 if ($link or has_capability('moodle/site:accessallgroups', $context)) { 2543 $linkurl = new moodle_url('/user/index.php', ['id' => $courseid, 'group' => $group->id]); 2544 $output .= html_writer::link($linkurl, $pictureimage); 2545 } else { 2546 $output .= $pictureimage; 2547 } 2548 2549 if ($return) { 2550 return $output; 2551 } else { 2552 echo $output; 2553 } 2554 } 2555 2556 /** 2557 * Return the url to the group picture. 2558 * 2559 * @param stdClass $group A group object. 2560 * @param int $courseid The course ID for the group. 2561 * @param bool $large A large or small group picture? Default is small. 2562 * @param boolean $includetoken Whether to use a user token when displaying this group image. 2563 * True indicates to generate a token for current user, and integer value indicates to generate a token for the 2564 * user whose id is the value indicated. 2565 * If the group picture is included in an e-mail or some other location where the audience is a specific 2566 * user who will not be logged in when viewing, then we use a token to authenticate the user. 2567 * @return moodle_url Returns the url for the group picture. 2568 */ 2569 function get_group_picture_url($group, $courseid, $large = false, $includetoken = false) { 2570 global $CFG; 2571 2572 $context = context_course::instance($courseid); 2573 2574 // If there is no picture, do nothing. 2575 if (!$group->picture) { 2576 return; 2577 } 2578 2579 // If picture is hidden, only show to those with course:managegroups. 2580 if ($group->hidepicture and !has_capability('moodle/course:managegroups', $context)) { 2581 return; 2582 } 2583 2584 if ($large) { 2585 $file = 'f1'; 2586 } else { 2587 $file = 'f2'; 2588 } 2589 2590 $grouppictureurl = moodle_url::make_pluginfile_url( 2591 $context->id, 'group', 'icon', $group->id, '/', $file, false, $includetoken); 2592 $grouppictureurl->param('rev', $group->picture); 2593 return $grouppictureurl; 2594 } 2595 2596 2597 /** 2598 * Display a recent activity note 2599 * 2600 * @staticvar string $strftimerecent 2601 * @param int $time A timestamp int. 2602 * @param stdClass $user A user object from the database. 2603 * @param string $text Text for display for the note 2604 * @param string $link The link to wrap around the text 2605 * @param bool $return If set to true the HTML is returned rather than echo'd 2606 * @param string $viewfullnames 2607 * @return string If $retrun was true returns HTML for a recent activity notice. 2608 */ 2609 function print_recent_activity_note($time, $user, $text, $link, $return=false, $viewfullnames=null) { 2610 static $strftimerecent = null; 2611 $output = ''; 2612 2613 if (is_null($viewfullnames)) { 2614 $context = context_system::instance(); 2615 $viewfullnames = has_capability('moodle/site:viewfullnames', $context); 2616 } 2617 2618 if (is_null($strftimerecent)) { 2619 $strftimerecent = get_string('strftimerecent'); 2620 } 2621 2622 $output .= '<div class="head">'; 2623 $output .= '<div class="date">'.userdate($time, $strftimerecent).'</div>'; 2624 $output .= '<div class="name">'.fullname($user, $viewfullnames).'</div>'; 2625 $output .= '</div>'; 2626 $output .= '<div class="info"><a href="'.$link.'">'.format_string($text, true).'</a></div>'; 2627 2628 if ($return) { 2629 return $output; 2630 } else { 2631 echo $output; 2632 } 2633 } 2634 2635 /** 2636 * Returns a popup menu with course activity modules 2637 * 2638 * Given a course this function returns a small popup menu with all the course activity modules in it, as a navigation menu 2639 * outputs a simple list structure in XHTML. 2640 * The data is taken from the serialised array stored in the course record. 2641 * 2642 * @param course $course A {@link $COURSE} object. 2643 * @param array $sections 2644 * @param course_modinfo $modinfo 2645 * @param string $strsection 2646 * @param string $strjumpto 2647 * @param int $width 2648 * @param string $cmid 2649 * @return string The HTML block 2650 */ 2651 function navmenulist($course, $sections, $modinfo, $strsection, $strjumpto, $width=50, $cmid=0) { 2652 2653 global $CFG, $OUTPUT; 2654 2655 $section = -1; 2656 $menu = array(); 2657 $doneheading = false; 2658 2659 $courseformatoptions = course_get_format($course)->get_format_options(); 2660 $coursecontext = context_course::instance($course->id); 2661 2662 $menu[] = '<ul class="navmenulist"><li class="jumpto section"><span>'.$strjumpto.'</span><ul>'; 2663 foreach ($modinfo->cms as $mod) { 2664 if (!$mod->has_view()) { 2665 // Don't show modules which you can't link to! 2666 continue; 2667 } 2668 2669 // For course formats using 'numsections' do not show extra sections. 2670 if (isset($courseformatoptions['numsections']) && $mod->sectionnum > $courseformatoptions['numsections']) { 2671 break; 2672 } 2673 2674 if (!$mod->uservisible) { // Do not icnlude empty sections at all. 2675 continue; 2676 } 2677 2678 if ($mod->sectionnum >= 0 and $section != $mod->sectionnum) { 2679 $thissection = $sections[$mod->sectionnum]; 2680 2681 if ($thissection->visible or 2682 (isset($courseformatoptions['hiddensections']) and !$courseformatoptions['hiddensections']) or 2683 has_capability('moodle/course:viewhiddensections', $coursecontext)) { 2684 $thissection->summary = strip_tags(format_string($thissection->summary, true)); 2685 if (!$doneheading) { 2686 $menu[] = '</ul></li>'; 2687 } 2688 if ($course->format == 'weeks' or empty($thissection->summary)) { 2689 $item = $strsection ." ". $mod->sectionnum; 2690 } else { 2691 if (core_text::strlen($thissection->summary) < ($width-3)) { 2692 $item = $thissection->summary; 2693 } else { 2694 $item = core_text::substr($thissection->summary, 0, $width).'...'; 2695 } 2696 } 2697 $menu[] = '<li class="section"><span>'.$item.'</span>'; 2698 $menu[] = '<ul>'; 2699 $doneheading = true; 2700 2701 $section = $mod->sectionnum; 2702 } else { 2703 // No activities from this hidden section shown. 2704 continue; 2705 } 2706 } 2707 2708 $url = $mod->modname .'/view.php?id='. $mod->id; 2709 $mod->name = strip_tags(format_string($mod->name ,true)); 2710 if (core_text::strlen($mod->name) > ($width+5)) { 2711 $mod->name = core_text::substr($mod->name, 0, $width).'...'; 2712 } 2713 if (!$mod->visible) { 2714 $mod->name = '('.$mod->name.')'; 2715 } 2716 $class = 'activity '.$mod->modname; 2717 $class .= ($cmid == $mod->id) ? ' selected' : ''; 2718 $menu[] = '<li class="'.$class.'">'. 2719 $OUTPUT->image_icon('icon', '', $mod->modname). 2720 '<a href="'.$CFG->wwwroot.'/mod/'.$url.'">'.$mod->name.'</a></li>'; 2721 } 2722 2723 if ($doneheading) { 2724 $menu[] = '</ul></li>'; 2725 } 2726 $menu[] = '</ul></li></ul>'; 2727 2728 return implode("\n", $menu); 2729 } 2730 2731 /** 2732 * Prints a grade menu (as part of an existing form) with help showing all possible numerical grades and scales. 2733 * 2734 * @todo Finish documenting this function 2735 * @todo Deprecate: this is only used in a few contrib modules 2736 * 2737 * @param int $courseid The course ID 2738 * @param string $name 2739 * @param string $current 2740 * @param boolean $includenograde Include those with no grades 2741 * @param boolean $return If set to true returns rather than echo's 2742 * @return string|bool Depending on value of $return 2743 */ 2744 function print_grade_menu($courseid, $name, $current, $includenograde=true, $return=false) { 2745 global $OUTPUT; 2746 2747 $output = ''; 2748 $strscale = get_string('scale'); 2749 $strscales = get_string('scales'); 2750 2751 $scales = get_scales_menu($courseid); 2752 foreach ($scales as $i => $scalename) { 2753 $grades[-$i] = $strscale .': '. $scalename; 2754 } 2755 if ($includenograde) { 2756 $grades[0] = get_string('nograde'); 2757 } 2758 for ($i=100; $i>=1; $i--) { 2759 $grades[$i] = $i; 2760 } 2761 $output .= html_writer::select($grades, $name, $current, false); 2762 2763 $linkobject = '<span class="helplink">' . $OUTPUT->pix_icon('help', $strscales) . '</span>'; 2764 $link = new moodle_url('/course/scales.php', array('id' => $courseid, 'list' => 1)); 2765 $action = new popup_action('click', $link, 'ratingscales', array('height' => 400, 'width' => 500)); 2766 $output .= $OUTPUT->action_link($link, $linkobject, $action, array('title' => $strscales)); 2767 2768 if ($return) { 2769 return $output; 2770 } else { 2771 echo $output; 2772 } 2773 } 2774 2775 /** 2776 * Print an error to STDOUT and exit with a non-zero code. For commandline scripts. 2777 * 2778 * Default errorcode is 1. 2779 * 2780 * Very useful for perl-like error-handling: 2781 * do_somethting() or mdie("Something went wrong"); 2782 * 2783 * @param string $msg Error message 2784 * @param integer $errorcode Error code to emit 2785 */ 2786 function mdie($msg='', $errorcode=1) { 2787 trigger_error($msg); 2788 exit($errorcode); 2789 } 2790 2791 /** 2792 * Print a message and exit. 2793 * 2794 * @param string $message The message to print in the notice 2795 * @param moodle_url|string $link The link to use for the continue button 2796 * @param object $course A course object. Unused. 2797 * @return void This function simply exits 2798 */ 2799 function notice ($message, $link='', $course=null) { 2800 global $PAGE, $OUTPUT; 2801 2802 $message = clean_text($message); // In case nasties are in here. 2803 2804 if (CLI_SCRIPT) { 2805 echo("!!$message!!\n"); 2806 exit(1); // No success. 2807 } 2808 2809 if (!$PAGE->headerprinted) { 2810 // Header not yet printed. 2811 $PAGE->set_title(get_string('notice')); 2812 echo $OUTPUT->header(); 2813 } else { 2814 echo $OUTPUT->container_end_all(false); 2815 } 2816 2817 echo $OUTPUT->box($message, 'generalbox', 'notice'); 2818 echo $OUTPUT->continue_button($link); 2819 2820 echo $OUTPUT->footer(); 2821 exit(1); // General error code. 2822 } 2823 2824 /** 2825 * Redirects the user to another page, after printing a notice. 2826 * 2827 * This function calls the OUTPUT redirect method, echo's the output and then dies to ensure nothing else happens. 2828 * 2829 * <strong>Good practice:</strong> You should call this method before starting page 2830 * output by using any of the OUTPUT methods. 2831 * 2832 * @param moodle_url|string $url A moodle_url to redirect to. Strings are not to be trusted! 2833 * @param string $message The message to display to the user 2834 * @param int $delay The delay before redirecting 2835 * @param string $messagetype The type of notification to show the message in. See constants on \core\output\notification. 2836 * @throws moodle_exception 2837 */ 2838 function redirect($url, $message='', $delay=null, $messagetype = \core\output\notification::NOTIFY_INFO) { 2839 global $OUTPUT, $PAGE, $CFG; 2840 2841 if (CLI_SCRIPT or AJAX_SCRIPT) { 2842 // This is wrong - developers should not use redirect in these scripts but it should not be very likely. 2843 throw new moodle_exception('redirecterrordetected', 'error'); 2844 } 2845 2846 if ($delay === null) { 2847 $delay = -1; 2848 } 2849 2850 // Prevent debug errors - make sure context is properly initialised. 2851 if ($PAGE) { 2852 $PAGE->set_context(null); 2853 $PAGE->set_pagelayout('redirect'); // No header and footer needed. 2854 $PAGE->set_title(get_string('pageshouldredirect', 'moodle')); 2855 } 2856 2857 if ($url instanceof moodle_url) { 2858 $url = $url->out(false); 2859 } 2860 2861 $debugdisableredirect = false; 2862 do { 2863 if (defined('DEBUGGING_PRINTED')) { 2864 // Some debugging already printed, no need to look more. 2865 $debugdisableredirect = true; 2866 break; 2867 } 2868 2869 if (core_useragent::is_msword()) { 2870 // Clicking a URL from MS Word sends a request to the server without cookies. If that 2871 // causes a redirect Word will open a browser pointing the new URL. If not, the URL that 2872 // was clicked is opened. Because the request from Word is without cookies, it almost 2873 // always results in a redirect to the login page, even if the user is logged in in their 2874 // browser. This is not what we want, so prevent the redirect for requests from Word. 2875 $debugdisableredirect = true; 2876 break; 2877 } 2878 2879 if (empty($CFG->debugdisplay) or empty($CFG->debug)) { 2880 // No errors should be displayed. 2881 break; 2882 } 2883 2884 if (!function_exists('error_get_last') or !$lasterror = error_get_last()) { 2885 break; 2886 } 2887 2888 if (!($lasterror['type'] & $CFG->debug)) { 2889 // Last error not interesting. 2890 break; 2891 } 2892 2893 // Watch out here, @hidden() errors are returned from error_get_last() too. 2894 if (headers_sent()) { 2895 // We already started printing something - that means errors likely printed. 2896 $debugdisableredirect = true; 2897 break; 2898 } 2899 2900 if (ob_get_level() and ob_get_contents()) { 2901 // There is something waiting to be printed, hopefully it is the errors, 2902 // but it might be some error hidden by @ too - such as the timezone mess from setup.php. 2903 $debugdisableredirect = true; 2904 break; 2905 } 2906 } while (false); 2907 2908 // Technically, HTTP/1.1 requires Location: header to contain the absolute path. 2909 // (In practice browsers accept relative paths - but still, might as well do it properly.) 2910 // This code turns relative into absolute. 2911 if (!preg_match('|^[a-z]+:|i', $url)) { 2912 // Get host name http://www.wherever.com. 2913 $hostpart = preg_replace('|^(.*?[^:/])/.*$|', '$1', $CFG->wwwroot); 2914 if (preg_match('|^/|', $url)) { 2915 // URLs beginning with / are relative to web server root so we just add them in. 2916 $url = $hostpart.$url; 2917 } else { 2918 // URLs not beginning with / are relative to path of current script, so add that on. 2919 $url = $hostpart.preg_replace('|\?.*$|', '', me()).'/../'.$url; 2920 } 2921 // Replace all ..s. 2922 while (true) { 2923 $newurl = preg_replace('|/(?!\.\.)[^/]*/\.\./|', '/', $url); 2924 if ($newurl == $url) { 2925 break; 2926 } 2927 $url = $newurl; 2928 } 2929 } 2930 2931 // Sanitise url - we can not rely on moodle_url or our URL cleaning 2932 // because they do not support all valid external URLs. 2933 $url = preg_replace('/[\x00-\x1F\x7F]/', '', $url); 2934 $url = str_replace('"', '%22', $url); 2935 $encodedurl = preg_replace("/\&(?![a-zA-Z0-9#]{1,8};)/", "&", $url); 2936 $encodedurl = preg_replace('/^.*href="([^"]*)".*$/', "\\1", clean_text('<a href="'.$encodedurl.'" />', FORMAT_HTML)); 2937 $url = str_replace('&', '&', $encodedurl); 2938 2939 if (!empty($message)) { 2940 if (!$debugdisableredirect && !headers_sent()) { 2941 // A message has been provided, and the headers have not yet been sent. 2942 // Display the message as a notification on the subsequent page. 2943 \core\notification::add($message, $messagetype); 2944 $message = null; 2945 $delay = 0; 2946 } else { 2947 if ($delay === -1 || !is_numeric($delay)) { 2948 $delay = 3; 2949 } 2950 $message = clean_text($message); 2951 } 2952 } else { 2953 $message = get_string('pageshouldredirect'); 2954 $delay = 0; 2955 } 2956 2957 // Make sure the session is closed properly, this prevents problems in IIS 2958 // and also some potential PHP shutdown issues. 2959 \core\session\manager::write_close(); 2960 2961 if ($delay == 0 && !$debugdisableredirect && !headers_sent()) { 2962 2963 // This helps when debugging redirect issues like loops and it is not clear 2964 // which layer in the stack sent the redirect header. If debugging is on 2965 // then the file and line is also shown. 2966 $redirectby = 'Moodle'; 2967 if (debugging('', DEBUG_DEVELOPER)) { 2968 $origin = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 1)[0]; 2969 $redirectby .= ' /' . str_replace($CFG->dirroot . '/', '', $origin['file']) . ':' . $origin['line']; 2970 } 2971 @header("X-Redirect-By: $redirectby"); 2972 2973 // 302 might not work for POST requests, 303 is ignored by obsolete clients. 2974 @header($_SERVER['SERVER_PROTOCOL'] . ' 303 See Other'); 2975 @header('Location: '.$url); 2976 echo bootstrap_renderer::plain_redirect_message($encodedurl); 2977 exit; 2978 } 2979 2980 // Include a redirect message, even with a HTTP redirect, because that is recommended practice. 2981 if ($PAGE) { 2982 $CFG->docroot = false; // To prevent the link to moodle docs from being displayed on redirect page. 2983 echo $OUTPUT->redirect_message($encodedurl, $message, $delay, $debugdisableredirect, $messagetype); 2984 exit; 2985 } else { 2986 echo bootstrap_renderer::early_redirect_message($encodedurl, $message, $delay); 2987 exit; 2988 } 2989 } 2990 2991 /** 2992 * Given an email address, this function will return an obfuscated version of it. 2993 * 2994 * @param string $email The email address to obfuscate 2995 * @return string The obfuscated email address 2996 */ 2997 function obfuscate_email($email) { 2998 $i = 0; 2999 $length = strlen($email); 3000 $obfuscated = ''; 3001 while ($i < $length) { 3002 if (rand(0, 2) && $email[$i]!='@') { // MDL-20619 some browsers have problems unobfuscating @. 3003 $obfuscated.='%'.dechex(ord($email[$i])); 3004 } else { 3005 $obfuscated.=$email[$i]; 3006 } 3007 $i++; 3008 } 3009 return $obfuscated; 3010 } 3011 3012 /** 3013 * This function takes some text and replaces about half of the characters 3014 * with HTML entity equivalents. Return string is obviously longer. 3015 * 3016 * @param string $plaintext The text to be obfuscated 3017 * @return string The obfuscated text 3018 */ 3019 function obfuscate_text($plaintext) { 3020 $i=0; 3021 $length = core_text::strlen($plaintext); 3022 $obfuscated=''; 3023 $prevobfuscated = false; 3024 while ($i < $length) { 3025 $char = core_text::substr($plaintext, $i, 1); 3026 $ord = core_text::utf8ord($char); 3027 $numerical = ($ord >= ord('0')) && ($ord <= ord('9')); 3028 if ($prevobfuscated and $numerical ) { 3029 $obfuscated.='&#'.$ord.';'; 3030 } else if (rand(0, 2)) { 3031 $obfuscated.='&#'.$ord.';'; 3032 $prevobfuscated = true; 3033 } else { 3034 $obfuscated.=$char; 3035 $prevobfuscated = false; 3036 } 3037 $i++; 3038 } 3039 return $obfuscated; 3040 } 3041 3042 /** 3043 * This function uses the {@link obfuscate_email()} and {@link obfuscate_text()} 3044 * to generate a fully obfuscated email link, ready to use. 3045 * 3046 * @param string $email The email address to display 3047 * @param string $label The text to displayed as hyperlink to $email 3048 * @param boolean $dimmed If true then use css class 'dimmed' for hyperlink 3049 * @param string $subject The subject of the email in the mailto link 3050 * @param string $body The content of the email in the mailto link 3051 * @return string The obfuscated mailto link 3052 */ 3053 function obfuscate_mailto($email, $label='', $dimmed=false, $subject = '', $body = '') { 3054 3055 if (empty($label)) { 3056 $label = $email; 3057 } 3058 3059 $label = obfuscate_text($label); 3060 $email = obfuscate_email($email); 3061 $mailto = obfuscate_text('mailto'); 3062 $url = new moodle_url("mailto:$email"); 3063 $attrs = array(); 3064 3065 if (!empty($subject)) { 3066 $url->param('subject', format_string($subject)); 3067 } 3068 if (!empty($body)) { 3069 $url->param('body', format_string($body)); 3070 } 3071 3072 // Use the obfuscated mailto. 3073 $url = preg_replace('/^mailto/', $mailto, $url->out()); 3074 3075 if ($dimmed) { 3076 $attrs['title'] = get_string('emaildisable'); 3077 $attrs['class'] = 'dimmed'; 3078 } 3079 3080 return html_writer::link($url, $label, $attrs); 3081 } 3082 3083 /** 3084 * This function is used to rebuild the <nolink> tag because some formats (PLAIN and WIKI) 3085 * will transform it to html entities 3086 * 3087 * @param string $text Text to search for nolink tag in 3088 * @return string 3089 */ 3090 function rebuildnolinktag($text) { 3091 3092 $text = preg_replace('/<(\/*nolink)>/i', '<$1>', $text); 3093 3094 return $text; 3095 } 3096 3097 /** 3098 * Prints a maintenance message from $CFG->maintenance_message or default if empty. 3099 */ 3100 function print_maintenance_message() { 3101 global $CFG, $SITE, $PAGE, $OUTPUT; 3102 3103 header($_SERVER['SERVER_PROTOCOL'] . ' 503 Moodle under maintenance'); 3104 header('Status: 503 Moodle under maintenance'); 3105 header('Retry-After: 300'); 3106 3107 $PAGE->set_pagetype('maintenance-message'); 3108 $PAGE->set_pagelayout('maintenance'); 3109 $PAGE->set_title(strip_tags($SITE->fullname)); 3110 $PAGE->set_heading($SITE->fullname); 3111 echo $OUTPUT->header(); 3112 echo $OUTPUT->heading(get_string('sitemaintenance', 'admin')); 3113 if (isset($CFG->maintenance_message) and !html_is_blank($CFG->maintenance_message)) { 3114 echo $OUTPUT->box_start('maintenance_message generalbox boxwidthwide boxaligncenter'); 3115 echo $CFG->maintenance_message; 3116 echo $OUTPUT->box_end(); 3117 } 3118 echo $OUTPUT->footer(); 3119 die; 3120 } 3121 3122 /** 3123 * Returns a string containing a nested list, suitable for formatting into tabs with CSS. 3124 * 3125 * It is not recommended to use this function in Moodle 2.5 but it is left for backward 3126 * compartibility. 3127 * 3128 * Example how to print a single line tabs: 3129 * $rows = array( 3130 * new tabobject(...), 3131 * new tabobject(...) 3132 * ); 3133 * echo $OUTPUT->tabtree($rows, $selectedid); 3134 * 3135 * Multiple row tabs may not look good on some devices but if you want to use them 3136 * you can specify ->subtree for the active tabobject. 3137 * 3138 * @param array $tabrows An array of rows where each row is an array of tab objects 3139 * @param string $selected The id of the selected tab (whatever row it's on) 3140 * @param array $inactive An array of ids of inactive tabs that are not selectable. 3141 * @param array $activated An array of ids of other tabs that are currently activated 3142 * @param bool $return If true output is returned rather then echo'd 3143 * @return string HTML output if $return was set to true. 3144 */ 3145 function print_tabs($tabrows, $selected = null, $inactive = null, $activated = null, $return = false) { 3146 global $OUTPUT; 3147 3148 $tabrows = array_reverse($tabrows); 3149 $subtree = array(); 3150 foreach ($tabrows as $row) { 3151 $tree = array(); 3152 3153 foreach ($row as $tab) { 3154 $tab->inactive = is_array($inactive) && in_array((string)$tab->id, $inactive); 3155 $tab->activated = is_array($activated) && in_array((string)$tab->id, $activated); 3156 $tab->selected = (string)$tab->id == $selected; 3157 3158 if ($tab->activated || $tab->selected) { 3159 $tab->subtree = $subtree; 3160 } 3161 $tree[] = $tab; 3162 } 3163 $subtree = $tree; 3164 } 3165 $output = $OUTPUT->tabtree($subtree); 3166 if ($return) { 3167 return $output; 3168 } else { 3169 print $output; 3170 return !empty($output); 3171 } 3172 } 3173 3174 /** 3175 * Alter debugging level for the current request, 3176 * the change is not saved in database. 3177 * 3178 * @param int $level one of the DEBUG_* constants 3179 * @param bool $debugdisplay 3180 */ 3181 function set_debugging($level, $debugdisplay = null) { 3182 global $CFG; 3183 3184 $CFG->debug = (int)$level; 3185 $CFG->debugdeveloper = (($CFG->debug & DEBUG_DEVELOPER) === DEBUG_DEVELOPER); 3186 3187 if ($debugdisplay !== null) { 3188 $CFG->debugdisplay = (bool)$debugdisplay; 3189 } 3190 } 3191 3192 /** 3193 * Standard Debugging Function 3194 * 3195 * Returns true if the current site debugging settings are equal or above specified level. 3196 * If passed a parameter it will emit a debugging notice similar to trigger_error(). The 3197 * routing of notices is controlled by $CFG->debugdisplay 3198 * eg use like this: 3199 * 3200 * 1) debugging('a normal debug notice'); 3201 * 2) debugging('something really picky', DEBUG_ALL); 3202 * 3) debugging('annoying debug message only for developers', DEBUG_DEVELOPER); 3203 * 4) if (debugging()) { perform extra debugging operations (do not use print or echo) } 3204 * 3205 * In code blocks controlled by debugging() (such as example 4) 3206 * any output should be routed via debugging() itself, or the lower-level 3207 * trigger_error() or error_log(). Using echo or print will break XHTML 3208 * JS and HTTP headers. 3209 * 3210 * It is also possible to define NO_DEBUG_DISPLAY which redirects the message to error_log. 3211 * 3212 * @param string $message a message to print 3213 * @param int $level the level at which this debugging statement should show 3214 * @param array $backtrace use different backtrace 3215 * @return bool 3216 */ 3217 function debugging($message = '', $level = DEBUG_NORMAL, $backtrace = null) { 3218 global $CFG, $USER; 3219 3220 $forcedebug = false; 3221 if (!empty($CFG->debugusers) && $USER) { 3222 $debugusers = explode(',', $CFG->debugusers); 3223 $forcedebug = in_array($USER->id, $debugusers); 3224 } 3225 3226 if (!$forcedebug and (empty($CFG->debug) || ($CFG->debug != -1 and $CFG->debug < $level))) { 3227 return false; 3228 } 3229 3230 if (!isset($CFG->debugdisplay)) { 3231 $CFG->debugdisplay = ini_get_bool('display_errors'); 3232 } 3233 3234 if ($message) { 3235 if (!$backtrace) { 3236 $backtrace = debug_backtrace(); 3237 } 3238 $from = format_backtrace($backtrace, CLI_SCRIPT || NO_DEBUG_DISPLAY); 3239 if (PHPUNIT_TEST) { 3240 if (phpunit_util::debugging_triggered($message, $level, $from)) { 3241 // We are inside test, the debug message was logged. 3242 return true; 3243 } 3244 } 3245 3246 if (NO_DEBUG_DISPLAY) { 3247 // Script does not want any errors or debugging in output, 3248 // we send the info to error log instead. 3249 error_log('Debugging: ' . $message . ' in '. PHP_EOL . $from); 3250 3251 } else if ($forcedebug or $CFG->debugdisplay) { 3252 if (!defined('DEBUGGING_PRINTED')) { 3253 define('DEBUGGING_PRINTED', 1); // Indicates we have printed something. 3254 } 3255 if (CLI_SCRIPT) { 3256 echo "++ $message ++\n$from"; 3257 } else { 3258 echo '<div class="notifytiny debuggingmessage" data-rel="debugging">' , $message , $from , '</div>'; 3259 } 3260 3261 } else { 3262 trigger_error($message . $from, E_USER_NOTICE); 3263 } 3264 } 3265 return true; 3266 } 3267 3268 /** 3269 * Outputs a HTML comment to the browser. 3270 * 3271 * This is used for those hard-to-debug pages that use bits from many different files in very confusing ways (e.g. blocks). 3272 * 3273 * <code>print_location_comment(__FILE__, __LINE__);</code> 3274 * 3275 * @param string $file 3276 * @param integer $line 3277 * @param boolean $return Whether to return or print the comment 3278 * @return string|void Void unless true given as third parameter 3279 */ 3280 function print_location_comment($file, $line, $return = false) { 3281 if ($return) { 3282 return "<!-- $file at line $line -->\n"; 3283 } else { 3284 echo "<!-- $file at line $line -->\n"; 3285 } 3286 } 3287 3288 3289 /** 3290 * Returns true if the user is using a right-to-left language. 3291 * 3292 * @return boolean true if the current language is right-to-left (Hebrew, Arabic etc) 3293 */ 3294 function right_to_left() { 3295 return (get_string('thisdirection', 'langconfig') === 'rtl'); 3296 } 3297 3298 3299 /** 3300 * Returns swapped left<=> right if in RTL environment. 3301 * 3302 * Part of RTL Moodles support. 3303 * 3304 * @param string $align align to check 3305 * @return string 3306 */ 3307 function fix_align_rtl($align) { 3308 if (!right_to_left()) { 3309 return $align; 3310 } 3311 if ($align == 'left') { 3312 return 'right'; 3313 } 3314 if ($align == 'right') { 3315 return 'left'; 3316 } 3317 return $align; 3318 } 3319 3320 3321 /** 3322 * Returns true if the page is displayed in a popup window. 3323 * 3324 * Gets the information from the URL parameter inpopup. 3325 * 3326 * @todo Use a central function to create the popup calls all over Moodle and 3327 * In the moment only works with resources and probably questions. 3328 * 3329 * @return boolean 3330 */ 3331 function is_in_popup() { 3332 $inpopup = optional_param('inpopup', '', PARAM_BOOL); 3333 3334 return ($inpopup); 3335 } 3336 3337 /** 3338 * Progress trace class. 3339 * 3340 * Use this class from long operations where you want to output occasional information about 3341 * what is going on, but don't know if, or in what format, the output should be. 3342 * 3343 * @copyright 2009 Tim Hunt 3344 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 3345 * @package core 3346 */ 3347 abstract class progress_trace { 3348 /** 3349 * Output an progress message in whatever format. 3350 * 3351 * @param string $message the message to output. 3352 * @param integer $depth indent depth for this message. 3353 */ 3354 abstract public function output($message, $depth = 0); 3355 3356 /** 3357 * Called when the processing is finished. 3358 */ 3359 public function finished() { 3360 } 3361 } 3362 3363 /** 3364 * This subclass of progress_trace does not ouput anything. 3365 * 3366 * @copyright 2009 Tim Hunt 3367 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 3368 * @package core 3369 */ 3370 class null_progress_trace extends progress_trace { 3371 /** 3372 * Does Nothing 3373 * 3374 * @param string $message 3375 * @param int $depth 3376 * @return void Does Nothing 3377 */ 3378 public function output($message, $depth = 0) { 3379 } 3380 } 3381 3382 /** 3383 * This subclass of progress_trace outputs to plain text. 3384 * 3385 * @copyright 2009 Tim Hunt 3386 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 3387 * @package core 3388 */ 3389 class text_progress_trace extends progress_trace { 3390 /** 3391 * Output the trace message. 3392 * 3393 * @param string $message 3394 * @param int $depth 3395 * @return void Output is echo'd 3396 */ 3397 public function output($message, $depth = 0) { 3398 mtrace(str_repeat(' ', $depth) . $message); 3399 } 3400 } 3401 3402 /** 3403 * This subclass of progress_trace outputs as HTML. 3404 * 3405 * @copyright 2009 Tim Hunt 3406 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 3407 * @package core 3408 */ 3409 class html_progress_trace extends progress_trace { 3410 /** 3411 * Output the trace message. 3412 * 3413 * @param string $message 3414 * @param int $depth 3415 * @return void Output is echo'd 3416 */ 3417 public function output($message, $depth = 0) { 3418 echo '<p>', str_repeat('  ', $depth), htmlspecialchars($message), "</p>\n"; 3419 flush(); 3420 } 3421 } 3422 3423 /** 3424 * HTML List Progress Tree 3425 * 3426 * @copyright 2009 Tim Hunt 3427 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 3428 * @package core 3429 */ 3430 class html_list_progress_trace extends progress_trace { 3431 /** @var int */ 3432 protected $currentdepth = -1; 3433 3434 /** 3435 * Echo out the list 3436 * 3437 * @param string $message The message to display 3438 * @param int $depth 3439 * @return void Output is echoed 3440 */ 3441 public function output($message, $depth = 0) { 3442 $samedepth = true; 3443 while ($this->currentdepth > $depth) { 3444 echo "</li>\n</ul>\n"; 3445 $this->currentdepth -= 1; 3446 if ($this->currentdepth == $depth) { 3447 echo '<li>'; 3448 } 3449 $samedepth = false; 3450 } 3451 while ($this->currentdepth < $depth) { 3452 echo "<ul>\n<li>"; 3453 $this->currentdepth += 1; 3454 $samedepth = false; 3455 } 3456 if ($samedepth) { 3457 echo "</li>\n<li>"; 3458 } 3459 echo htmlspecialchars($message); 3460 flush(); 3461 } 3462 3463 /** 3464 * Called when the processing is finished. 3465 */ 3466 public function finished() { 3467 while ($this->currentdepth >= 0) { 3468 echo "</li>\n</ul>\n"; 3469 $this->currentdepth -= 1; 3470 } 3471 } 3472 } 3473 3474 /** 3475 * This subclass of progress_trace outputs to error log. 3476 * 3477 * @copyright Petr Skoda {@link http://skodak.org} 3478 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 3479 * @package core 3480 */ 3481 class error_log_progress_trace extends progress_trace { 3482 /** @var string log prefix */ 3483 protected $prefix; 3484 3485 /** 3486 * Constructor. 3487 * @param string $prefix optional log prefix 3488 */ 3489 public function __construct($prefix = '') { 3490 $this->prefix = $prefix; 3491 } 3492 3493 /** 3494 * Output the trace message. 3495 * 3496 * @param string $message 3497 * @param int $depth 3498 * @return void Output is sent to error log. 3499 */ 3500 public function output($message, $depth = 0) { 3501 error_log($this->prefix . str_repeat(' ', $depth) . $message); 3502 } 3503 } 3504 3505 /** 3506 * Special type of trace that can be used for catching of output of other traces. 3507 * 3508 * @copyright Petr Skoda {@link http://skodak.org} 3509 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 3510 * @package core 3511 */ 3512 class progress_trace_buffer extends progress_trace { 3513 /** @var progres_trace */ 3514 protected $trace; 3515 /** @var bool do we pass output out */ 3516 protected $passthrough; 3517 /** @var string output buffer */ 3518 protected $buffer; 3519 3520 /** 3521 * Constructor. 3522 * 3523 * @param progress_trace $trace 3524 * @param bool $passthrough true means output and buffer, false means just buffer and no output 3525 */ 3526 public function __construct(progress_trace $trace, $passthrough = true) { 3527 $this->trace = $trace; 3528 $this->passthrough = $passthrough; 3529 $this->buffer = ''; 3530 } 3531 3532 /** 3533 * Output the trace message. 3534 * 3535 * @param string $message the message to output. 3536 * @param int $depth indent depth for this message. 3537 * @return void output stored in buffer 3538 */ 3539 public function output($message, $depth = 0) { 3540 ob_start(); 3541 $this->trace->output($message, $depth); 3542 $this->buffer .= ob_get_contents(); 3543 if ($this->passthrough) { 3544 ob_end_flush(); 3545 } else { 3546 ob_end_clean(); 3547 } 3548 } 3549 3550 /** 3551 * Called when the processing is finished. 3552 */ 3553 public function finished() { 3554 ob_start(); 3555 $this->trace->finished(); 3556 $this->buffer .= ob_get_contents(); 3557 if ($this->passthrough) { 3558 ob_end_flush(); 3559 } else { 3560 ob_end_clean(); 3561 } 3562 } 3563 3564 /** 3565 * Reset internal text buffer. 3566 */ 3567 public function reset_buffer() { 3568 $this->buffer = ''; 3569 } 3570 3571 /** 3572 * Return internal text buffer. 3573 * @return string buffered plain text 3574 */ 3575 public function get_buffer() { 3576 return $this->buffer; 3577 } 3578 } 3579 3580 /** 3581 * Special type of trace that can be used for redirecting to multiple other traces. 3582 * 3583 * @copyright Petr Skoda {@link http://skodak.org} 3584 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 3585 * @package core 3586 */ 3587 class combined_progress_trace extends progress_trace { 3588 3589 /** 3590 * An array of traces. 3591 * @var array 3592 */ 3593 protected $traces; 3594 3595 /** 3596 * Constructs a new instance. 3597 * 3598 * @param array $traces multiple traces 3599 */ 3600 public function __construct(array $traces) { 3601 $this->traces = $traces; 3602 } 3603 3604 /** 3605 * Output an progress message in whatever format. 3606 * 3607 * @param string $message the message to output. 3608 * @param integer $depth indent depth for this message. 3609 */ 3610 public function output($message, $depth = 0) { 3611 foreach ($this->traces as $trace) { 3612 $trace->output($message, $depth); 3613 } 3614 } 3615 3616 /** 3617 * Called when the processing is finished. 3618 */ 3619 public function finished() { 3620 foreach ($this->traces as $trace) { 3621 $trace->finished(); 3622 } 3623 } 3624 } 3625 3626 /** 3627 * Returns a localized sentence in the current language summarizing the current password policy 3628 * 3629 * @todo this should be handled by a function/method in the language pack library once we have a support for it 3630 * @uses $CFG 3631 * @return string 3632 */ 3633 function print_password_policy() { 3634 global $CFG; 3635 3636 $message = ''; 3637 if (!empty($CFG->passwordpolicy)) { 3638 $messages = array(); 3639 if (!empty($CFG->minpasswordlength)) { 3640 $messages[] = get_string('informminpasswordlength', 'auth', $CFG->minpasswordlength); 3641 } 3642 if (!empty($CFG->minpassworddigits)) { 3643 $messages[] = get_string('informminpassworddigits', 'auth', $CFG->minpassworddigits); 3644 } 3645 if (!empty($CFG->minpasswordlower)) { 3646 $messages[] = get_string('informminpasswordlower', 'auth', $CFG->minpasswordlower); 3647 } 3648 if (!empty($CFG->minpasswordupper)) { 3649 $messages[] = get_string('informminpasswordupper', 'auth', $CFG->minpasswordupper); 3650 } 3651 if (!empty($CFG->minpasswordnonalphanum)) { 3652 $messages[] = get_string('informminpasswordnonalphanum', 'auth', $CFG->minpasswordnonalphanum); 3653 } 3654 3655 // Fire any additional password policy functions from plugins. 3656 // Callbacks must return an array of message strings. 3657 $pluginsfunction = get_plugins_with_function('print_password_policy'); 3658 foreach ($pluginsfunction as $plugintype => $plugins) { 3659 foreach ($plugins as $pluginfunction) { 3660 $messages = array_merge($messages, $pluginfunction()); 3661 } 3662 } 3663 3664 $messages = join(', ', $messages); // This is ugly but we do not have anything better yet... 3665 // Check if messages is empty before outputting any text. 3666 if ($messages != '') { 3667 $message = get_string('informpasswordpolicy', 'auth', $messages); 3668 } 3669 } 3670 return $message; 3671 } 3672 3673 /** 3674 * Get the value of a help string fully prepared for display in the current language. 3675 * 3676 * @param string $identifier The identifier of the string to search for. 3677 * @param string $component The module the string is associated with. 3678 * @param boolean $ajax Whether this help is called from an AJAX script. 3679 * This is used to influence text formatting and determines 3680 * which format to output the doclink in. 3681 * @param string|object|array $a An object, string or number that can be used 3682 * within translation strings 3683 * @return Object An object containing: 3684 * - heading: Any heading that there may be for this help string. 3685 * - text: The wiki-formatted help string. 3686 * - doclink: An object containing a link, the linktext, and any additional 3687 * CSS classes to apply to that link. Only present if $ajax = false. 3688 * - completedoclink: A text representation of the doclink. Only present if $ajax = true. 3689 */ 3690 function get_formatted_help_string($identifier, $component, $ajax = false, $a = null) { 3691 global $CFG, $OUTPUT; 3692 $sm = get_string_manager(); 3693 3694 // Do not rebuild caches here! 3695 // Devs need to learn to purge all caches after any change or disable $CFG->langstringcache. 3696 3697 $data = new stdClass(); 3698 3699 if ($sm->string_exists($identifier, $component)) { 3700 $data->heading = format_string(get_string($identifier, $component)); 3701 } else { 3702 // Gracefully fall back to an empty string. 3703 $data->heading = ''; 3704 } 3705 3706 if ($sm->string_exists($identifier . '_help', $component)) { 3707 $options = new stdClass(); 3708 $options->trusted = false; 3709 $options->noclean = false; 3710 $options->smiley = false; 3711 $options->filter = false; 3712 $options->para = true; 3713 $options->newlines = false; 3714 $options->overflowdiv = !$ajax; 3715 3716 // Should be simple wiki only MDL-21695. 3717 $data->text = format_text(get_string($identifier.'_help', $component, $a), FORMAT_MARKDOWN, $options); 3718 3719 $helplink = $identifier . '_link'; 3720 if ($sm->string_exists($helplink, $component)) { // Link to further info in Moodle docs. 3721 $link = get_string($helplink, $component); 3722 $linktext = get_string('morehelp'); 3723 3724 $data->doclink = new stdClass(); 3725 $url = new moodle_url(get_docs_url($link)); 3726 if ($ajax) { 3727 $data->doclink->link = $url->out(); 3728 $data->doclink->linktext = $linktext; 3729 $data->doclink->class = ($CFG->doctonewwindow) ? 'helplinkpopup' : ''; 3730 } else { 3731 $data->completedoclink = html_writer::tag('div', $OUTPUT->doc_link($link, $linktext), 3732 array('class' => 'helpdoclink')); 3733 } 3734 } 3735 } else { 3736 $data->text = html_writer::tag('p', 3737 html_writer::tag('strong', 'TODO') . ": missing help string [{$identifier}_help, {$component}]"); 3738 } 3739 return $data; 3740 }
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