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Differences Between: [Versions 310 and 401] [Versions 401 and 402] [Versions 401 and 403]

   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   * This file is responsible for serving of yui Javascript and CSS
  19   *
  20   * @package   core
  21   * @copyright 2009 Petr Skoda (skodak)  {@link http://skodak.org}
  22   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  
  26  // disable moodle specific debug messages and any errors in output,
  27  // comment out when debugging or better look into error log!
  28  define('NO_DEBUG_DISPLAY', true);
  29  
  30  // we need just the values from config.php and minlib.php
  31  define('ABORT_AFTER_CONFIG', true);
  32  require('../config.php'); // this stops immediately at the beginning of lib/setup.php
  33  
  34  // get special url parameters
  35  
  36  list($parts, $slasharguments) = combo_params();
  37  if (!$parts) {
  38      combo_not_found();
  39  }
  40  
  41  $parts = trim($parts, '&');
  42  
  43  // Remove any duplicate parts, since each file only needs to be loaded once (which also helps reduce total file size).
  44  $parts = implode('&', array_unique(explode('&', $parts)));
  45  
  46  // Limit length of parts to match the YUI loader limit of 1024, to prevent loading an arbitrary number of files.
  47  if (strlen($parts) > 1024) {
  48      $parts = substr($parts, 0, 1024);
  49  
  50      // If the shortened $parts has been cut off mid-way through a filename, trim back to the end of the previous filename.
  51      if (substr($parts, -3) !== '.js' && substr($parts, -4) !== '.css') {
  52          $parts = substr($parts, 0, strrpos($parts, '&'));
  53      }
  54  }
  55  
  56  // find out what we are serving - only one type per request
  57  $content = '';
  58  if (substr($parts, -3) === '.js') {
  59      $mimetype = 'application/javascript';
  60  } else if (substr($parts, -4) === '.css') {
  61      $mimetype = 'text/css';
  62  } else {
  63      combo_not_found();
  64  }
  65  
  66  $etag = sha1($parts);
  67  
  68  // if they are requesting a revision that's not -1, and they have supplied an
  69  // If-Modified-Since header, we can send back a 304 Not Modified since the
  70  // content never changes (the rev number is increased any time the content changes)
  71  if (strpos($parts, '/-1/') === false and (!empty($_SERVER['HTTP_IF_NONE_MATCH']) || !empty($_SERVER['HTTP_IF_MODIFIED_SINCE']))) {
  72      $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
  73      header('HTTP/1.1 304 Not Modified');
  74      header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
  75      header('Cache-Control: public, max-age='.$lifetime);
  76      header('Content-Type: '.$mimetype);
  77      header('Etag: "'.$etag.'"');
  78      die;
  79  }
  80  
  81  $parts = explode('&', $parts);
  82  $cache = true;
  83  $lastmodified = 0;
  84  
  85  while (count($parts)) {
  86      $part = array_shift($parts);
  87      if (empty($part)) {
  88          continue;
  89      }
  90      $filecontent = '';
  91      $part = min_clean_param($part, 'SAFEPATH');
  92      $bits = explode('/', $part);
  93      if (count($bits) < 2) {
  94          $content .= "\n// Wrong combo resource $part!\n";
  95          continue;
  96      }
  97  
  98      $version = array_shift($bits);
  99      if ($version === 'rollup') {
 100          $yuipatchedversion = explode('_', array_shift($bits));
 101          $revision = $yuipatchedversion[0];
 102          $rollupname = array_shift($bits);
 103  
 104          if (strpos($rollupname, 'yui-moodlesimple') !== false) {
 105              if (substr($rollupname, -3) === '.js') {
 106                  // Determine which version of this rollup should be used.
 107                  $filesuffix = '.js';
 108                  preg_match('/(-(debug|min))?\.js/', $rollupname, $matches);
 109                  if (isset($matches[1])) {
 110                      $filesuffix = $matches[0];
 111                  }
 112  
 113                  $type = 'js';
 114              } else if (substr($rollupname, -4) === '.css') {
 115                  $type = 'css';
 116              } else {
 117                  continue;
 118              }
 119  
 120              // Allow support for revisions on YUI between official releases.
 121              // We can just discard the subrevision since it is only used to invalidate the browser cache.
 122              $yuipatchedversion = explode('_', $revision);
 123              $yuiversion = $yuipatchedversion[0];
 124  
 125              $yuimodules = array(
 126                  'yui',
 127                  'oop',
 128                  'event-custom-base',
 129                  'dom-core',
 130                  'dom-base',
 131                  'color-base',
 132                  'dom-style',
 133                  'selector-native',
 134                  'selector',
 135                  'node-core',
 136                  'node-base',
 137                  'event-base',
 138                  'event-base-ie',
 139                  'pluginhost-base',
 140                  'pluginhost-config',
 141                  'event-delegate',
 142                  'node-event-delegate',
 143                  'node-pluginhost',
 144                  'dom-screen',
 145                  'node-screen',
 146                  'node-style',
 147                  'querystring-stringify-simple',
 148                  'io-base',
 149                  'json-parse',
 150                  'transition',
 151                  'selector-css2',
 152                  'selector-css3',
 153                  'dom-style-ie',
 154  
 155                  // Some extras we use everywhere.
 156                  'escape',
 157  
 158                  'attribute-core',
 159                  'event-custom-complex',
 160                  'base-core',
 161                  'attribute-base',
 162                  'attribute-extras',
 163                  'attribute-observable',
 164                  'base-observable',
 165                  'base-base',
 166                  'base-pluginhost',
 167                  'base-build',
 168                  'event-synthetic',
 169  
 170                  'attribute-complex',
 171                  'event-mouseenter',
 172                  'event-key',
 173                  'event-outside',
 174                  'event-focus',
 175                  'classnamemanager',
 176                  'widget-base',
 177                  'widget-htmlparser',
 178                  'widget-skin',
 179                  'widget-uievents',
 180                  'widget-stdmod',
 181                  'widget-position',
 182                  'widget-position-align',
 183                  'widget-stack',
 184                  'widget-position-constrain',
 185                  'overlay',
 186  
 187                  'widget-autohide',
 188                  'button-core',
 189                  'button-plugin',
 190                  'widget-buttons',
 191                  'widget-modality',
 192                  'panel',
 193                  'yui-throttle',
 194                  'dd-ddm-base',
 195                  'dd-drag',
 196                  'dd-plugin',
 197  
 198                  // Cache is used by moodle-core-tooltip which we include everywhere.
 199                  'cache-base',
 200              );
 201  
 202              // We need to add these new parts to the beginning of the $parts list, not the end.
 203              if ($type === 'js') {
 204                  $newparts = array();
 205                  foreach ($yuimodules as $module) {
 206                      $newparts[] = $yuiversion . '/' . $module . '/' . $module . $filesuffix;
 207                  }
 208                  $newparts[] = 'yuiuseall/yuiuseall';
 209                  $parts = array_merge($newparts, $parts);
 210              } else {
 211                  $newparts = array();
 212                  foreach ($yuimodules as $module) {
 213                      $candidate =  $yuiversion . '/' . $module . '/assets/skins/sam/' . $module . '.css';
 214                      if (!file_exists("$CFG->libdir/yuilib/$candidate")) {
 215                          continue;
 216                      }
 217                      $newparts[] = $candidate;
 218                  }
 219                  if ($newparts) {
 220                      $parts = array_merge($newparts, $parts);
 221                  }
 222              }
 223          }
 224  
 225          continue;
 226      }
 227      if ($version === 'm') {
 228          $version = 'moodle';
 229      }
 230      if ($version === 'moodle') {
 231          if (count($bits) <= 3) {
 232              // This is an invalid module load attempt.
 233              $content .= "\n// Incorrect moodle module inclusion. Not enough component information in {$part}.\n";
 234              continue;
 235          }
 236          $revision = (int)array_shift($bits);
 237          if (!min_is_revision_valid_and_current($revision)) {
 238              // A non-current revision means please don't cache the JS
 239              $revision = -1;
 240              $cache = false;
 241          }
 242          $frankenstyle = array_shift($bits);
 243          $filename = array_pop($bits);
 244          $modulename = $bits[0];
 245          $dir = core_component::get_component_directory($frankenstyle);
 246  
 247          // For shifted YUI modules, we need the YUI module name in frankenstyle format.
 248          $frankenstylemodulename = join('-', array($version, $frankenstyle, $modulename));
 249          $frankenstylefilename = preg_replace('/' . $modulename . '/', $frankenstylemodulename, $filename);
 250  
 251          // Submodules are stored in a directory with the full submodule name.
 252          // We need to remove the -debug.js, -min.js, and .js from the file name to calculate that directory name.
 253          $frankenstyledirectoryname = str_replace(array('-min.js', '-debug.js', '.js', '.css'), '', $frankenstylefilename);
 254  
 255          // By default, try and use the /yui/build directory.
 256          $contentfile = $dir . '/yui/build/' . $frankenstyledirectoryname;
 257          if ($mimetype == 'text/css') {
 258              // CSS assets are in a slightly different place to the JS.
 259              $contentfile = $contentfile . '/assets/skins/sam/' . $frankenstylefilename;
 260  
 261              // Add the path to the bits to handle fallback for non-shifted assets.
 262              $bits[] = 'assets';
 263              $bits[] = 'skins';
 264              $bits[] = 'sam';
 265          } else {
 266              $contentfile = $contentfile . '/' . $frankenstylefilename;
 267          }
 268  
 269          // If the shifted versions don't exist, fall back to the non-shifted file.
 270          if (!file_exists($contentfile) or !is_file($contentfile)) {
 271              // We have to revert to the non-minified and non-debug versions.
 272              $filename = preg_replace('/-(min|debug)\./', '.', $filename);
 273              $contentfile = $dir . '/yui/' . join('/', $bits) . '/' . $filename;
 274          }
 275      } else if ($version === '2in3') {
 276          $contentfile = "$CFG->libdir/yuilib/$part";
 277  
 278      } else if ($version == 'gallery') {
 279          if (count($bits) <= 2) {
 280              // This is an invalid module load attempt.
 281              $content .= "\n// Incorrect moodle module inclusion. Not enough component information in {$part}.\n";
 282              continue;
 283          }
 284          $revision = (int)array_shift($bits);
 285          if (!min_is_revision_valid_and_current($revision)) {
 286              // A non-current revision means please don't cache the JS
 287              $revision = -1;
 288              $cache = false;
 289          }
 290          $contentfile = "$CFG->libdir/yuilib/gallery/" . join('/', $bits);
 291  
 292      } else if ($version == 'yuiuseall') {
 293          // Create global Y that is available in global scope,
 294          // this is the trick behind original SimpleYUI.
 295          $filecontent = "var Y = YUI().use('*');";
 296  
 297      } else {
 298          // Allow support for revisions on YUI between official releases.
 299          // We can just discard the subrevision since it is only used to invalidate the browser cache.
 300          $yuipatchedversion = explode('_', $version);
 301          $yuiversion = $yuipatchedversion[0];
 302          if ($yuiversion != $CFG->yui3version) {
 303              $content .= "\n// Wrong yui version $part!\n";
 304              continue;
 305          }
 306          $newpart = explode('/', $part);
 307          $newpart[0] = $yuiversion;
 308          $part = implode('/', $newpart);
 309          $contentfile = "$CFG->libdir/yuilib/$part";
 310      }
 311      if (!file_exists($contentfile) or !is_file($contentfile)) {
 312          $location = '$CFG->dirroot'.preg_replace('/^'.preg_quote($CFG->dirroot, '/').'/', '', $contentfile);
 313          $content .= "\n// Combo resource $part ($location) not found!\n";
 314          continue;
 315      }
 316  
 317      if (empty($filecontent)) {
 318          $filecontent = file_get_contents($contentfile);
 319      }
 320      $fmodified = filemtime($contentfile);
 321      if ($fmodified > $lastmodified) {
 322          $lastmodified = $fmodified;
 323      }
 324  
 325      $relroot = preg_replace('|^http.?://[^/]+|', '', $CFG->wwwroot);
 326      $sep = ($slasharguments ? '/' : '?file=');
 327  
 328      if ($mimetype === 'text/css') {
 329          if ($version == 'moodle') {
 330              // Search for all images in the file and replace with an appropriate link to the yui_image.php script
 331              $imagebits = array(
 332                  $sep . $version,
 333                  $frankenstyle,
 334                  $modulename,
 335                  array_shift($bits),
 336                  '$1.$2'
 337              );
 338  
 339              $filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot . '/theme/yui_image.php' . implode('/', $imagebits), $filecontent);
 340          } else if ($version == '2in3') {
 341              // First we need to remove relative paths to images. These are used by YUI modules to make use of global assets.
 342              // I've added this as a separate regex so it can be easily removed once
 343              // YUI standardise there CSS methods
 344              $filecontent = preg_replace('#(\.\./\.\./\.\./\.\./assets/skins/sam/)?([a-z0-9_-]+)\.(png|gif)#', '$2.$3', $filecontent);
 345  
 346              // search for all images in yui2 CSS and serve them through the yui_image.php script
 347              $filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot.'/theme/yui_image.php'.$sep.$CFG->yui2version.'/$1.$2', $filecontent);
 348  
 349          } else if ($version == 'gallery') {
 350              // Replace any references to the CDN with a relative link.
 351              $filecontent = preg_replace('#(' . preg_quote('http://yui.yahooapis.com/') . '(gallery-[^/]*/))#', '../../../../', $filecontent);
 352  
 353              // Replace all relative image links with the a link to yui_image.php.
 354              $filecontent = preg_replace('#(' . preg_quote('../../../../') . ')(gallery-[^/]*/assets/skins/sam/[a-z0-9_-]+)\.(png|gif)#',
 355                      $relroot . '/theme/yui_image.php' . $sep . '/gallery/' . $revision . '/$2.$3', $filecontent);
 356  
 357          } else {
 358              // First we need to remove relative paths to images. These are used by YUI modules to make use of global assets.
 359              // I've added this as a separate regex so it can be easily removed once
 360              // YUI standardise there CSS methods
 361              $filecontent = preg_replace('#(\.\./\.\./\.\./\.\./assets/skins/sam/)?([a-z0-9_-]+)\.(png|gif)#', '$2.$3', $filecontent);
 362  
 363              // search for all images in yui2 CSS and serve them through the yui_image.php script
 364              $filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot.'/theme/yui_image.php'.$sep.$version.'/$1.$2', $filecontent);
 365          }
 366      }
 367  
 368      $content .= $filecontent;
 369  }
 370  
 371  if ($lastmodified == 0) {
 372      $lastmodified = time();
 373  }
 374  
 375  if ($cache) {
 376      combo_send_cached($content, $mimetype, $etag, $lastmodified);
 377  } else {
 378      combo_send_uncached($content, $mimetype);
 379  }
 380  
 381  
 382  /**
 383   * Send the JavaScript cached
 384   * @param string $content
 385   * @param string $mimetype
 386   * @param string $etag
 387   * @param int $lastmodified
 388   */
 389  function combo_send_cached($content, $mimetype, $etag, $lastmodified) {
 390      $lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
 391  
 392      header('Content-Disposition: inline; filename="combo"');
 393      header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');
 394      header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
 395      header('Pragma: ');
 396      header('Cache-Control: public, max-age='.$lifetime.', immutable');
 397      header('Accept-Ranges: none');
 398      header('Content-Type: '.$mimetype);
 399      header('Etag: "'.$etag.'"');
 400      if (!min_enable_zlib_compression()) {
 401          header('Content-Length: '.strlen($content));
 402      }
 403  
 404      echo $content;
 405      die;
 406  }
 407  
 408  /**
 409   * Send the JavaScript uncached
 410   * @param string $content
 411   * @param string $mimetype
 412   */
 413  function combo_send_uncached($content, $mimetype) {
 414      header('Content-Disposition: inline; filename="combo"');
 415      header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
 416      header('Expires: '. gmdate('D, d M Y H:i:s', time() + 2) .' GMT');
 417      header('Pragma: ');
 418      header('Accept-Ranges: none');
 419      header('Content-Type: '.$mimetype);
 420      if (!min_enable_zlib_compression()) {
 421          header('Content-Length: '.strlen($content));
 422      }
 423  
 424      echo $content;
 425      die;
 426  }
 427  
 428  function combo_not_found($message = '') {
 429      header('HTTP/1.0 404 not found');
 430      if ($message) {
 431          echo $message;
 432      } else {
 433          echo 'Combo resource not found, sorry.';
 434      }
 435      die;
 436  }
 437  
 438  function combo_params() {
 439      if (isset($_SERVER['QUERY_STRING']) and strpos($_SERVER['QUERY_STRING'], 'file=/') === 0) {
 440          // url rewriting
 441          $slashargument = substr($_SERVER['QUERY_STRING'], 6);
 442          return array($slashargument, true);
 443  
 444      } else if (isset($_SERVER['REQUEST_URI']) and strpos($_SERVER['REQUEST_URI'], '?') !== false) {
 445          $parts = explode('?', $_SERVER['REQUEST_URI'], 2);
 446          return array($parts[1], false);
 447  
 448      } else if (isset($_SERVER['QUERY_STRING']) and strpos($_SERVER['QUERY_STRING'], '?') !== false) {
 449          // note: buggy or misconfigured IIS does return the query string in REQUEST_URI
 450          return array($_SERVER['QUERY_STRING'], false);
 451  
 452      } else if ($slashargument = min_get_slash_argument(false)) {
 453          $slashargument = ltrim($slashargument, '/');
 454          return array($slashargument, true);
 455  
 456      } else {
 457          // unsupported server, sorry!
 458          combo_not_found('Unsupported server - query string can not be determined, try disabling YUI combo loading in admin settings.');
 459      }
 460  }