lib/blocklib.php

   1 <?php //$Id$
   2
   3 //This library includes all the necessary stuff to use blocks in course pages
   4
   5 define('BLOCK_MOVE_LEFT',   0x01);
   6 define('BLOCK_MOVE_RIGHT',  0x02);
   7 define('BLOCK_MOVE_UP',     0x04);
   8 define('BLOCK_MOVE_DOWN',   0x08);
   9 define('BLOCK_CONFIGURE',   0x10);
  10
  11 define('BLOCK_POS_LEFT',  'l');
  12 define('BLOCK_POS_RIGHT', 'r');
  13
  14 define('BLOCKS_PINNED_TRUE',0);
  15 define('BLOCKS_PINNED_FALSE',1);
  16 define('BLOCKS_PINNED_BOTH',2);
  17
  18 require_once($CFG->libdir.'/pagelib.php');
  19 require_once($CFG->dirroot.'/course/lib.php'); // needed to solve all those: Call to undefined function: print_recent_activity() when adding Recent Activity
  20
  21 // Returns false if this block is incompatible with the current version of Moodle.
  22 function block_is_compatible($blockname) {
  23     global $CFG;
  24
  25     $file = @file($CFG->dirroot.'/blocks/'.$blockname.'/block_'.$blockname.'.php'); // ignore errors when file does not exist
  26     if(empty($file)) {
  27         return NULL;
  28     }
  29
  30     foreach($file as $line) {
  31         // If you find MoodleBlock (appearing in the class declaration) it's not compatible
  32         if(strpos($line, 'MoodleBlock')) {
  33             return false;
  34         }
  35         // But if we find a { it means the class declaration is over, so it's compatible
  36         else if(strpos($line, '{')) {
  37             return true;
  38         }
  39     }
  40
  41     return NULL;
  42 }
  43
  44 // Returns the case-sensitive name of the class' constructor function. This includes both
  45 // PHP5- and PHP4-style constructors. If no appropriate constructor can be found, returns NULL.
  46 // If there is no such class, returns boolean false.
  47 function get_class_constructor($classname) {
  48     // Caching
  49     static $constructors = array();
  50
  51     if(!class_exists($classname)) {
  52         return false;
  53     }
  54
  55     // Tests indicate this doesn't hurt even in PHP5.
  56     $classname = strtolower($classname);
  57
  58     // Return cached value, if exists
  59     if(isset($constructors[$classname])) {
  60         return $constructors[$classname];
  61     }
  62
  63     // Get a list of methods. After examining several different ways of
  64     // doing the check, (is_callable, method_exists, function_exists etc)
  65     // it seems that this is the most reliable one.
  66     $methods = get_class_methods($classname);
  67
  68     // PHP5 constructor?
  69     if(phpversion() >= '5') {
  70         if(in_array('__construct', $methods)) {
  71             return $constructors[$classname] = '__construct';
  72         }
  73     }
  74
  75     // If we have PHP5 but no magic constructor, we have to lowercase the methods
  76     $methods = array_map('strtolower', $methods);
  77
  78     if(in_array($classname, $methods)) {
  79         return $constructors[$classname] = $classname;
  80     }
  81
  82     return $constructors[$classname] = NULL;
  83 }
  84
  85 //This function retrieves a method-defined property of a class WITHOUT instantiating an object
  86 function block_method_result($blockname, $method, $param = NULL) {
  87     if(!block_load_class($blockname)) {
  88         return NULL;
  89     }
  90     return call_user_func(array('block_'.$blockname, $method), $param);
  91 }
  92
  93 //This function creates a new object of the specified block class
  94 function block_instance($blockname, $instance = NULL) {
  95     if(!block_load_class($blockname)) {
  96         return false;
  97     }
  98     $classname = 'block_'.$blockname;
  99     $retval = new $classname;
 100     if($instance !== NULL) {
 101         $retval->_load_instance($instance);
 102     }
 103     return $retval;
 104 }
 105
 106 //This function loads the necessary class files for a block
 107 //Whenever you want to load a block, use this first
 108 function block_load_class($blockname) {
 109     global $CFG;
 110
 111     if(empty($blockname)) {
 112         return false;
 113     }
 114
 115     $classname = 'block_'.$blockname;
 116
 117     if(class_exists($classname)) {
 118         return true;
 119     }
 120
 121     require_once($CFG->dirroot.'/blocks/moodleblock.class.php');
 122     @include_once($CFG->dirroot.'/blocks/'.$blockname.'/block_'.$blockname.'.php'); // do not throw errors if block code not present
 123
 124     return class_exists($classname);
 125 }
 126
 127 // This function returns an array with the IDs of any blocks that you can add to your page.
 128 // Parameters are passed by reference for speed; they are not modified at all.
 129 function blocks_get_missing(&$page, &$pageblocks) {
 130
 131     $missingblocks = array();
 132     $allblocks = blocks_get_record();
 133     $pageformat = $page->get_format_name();
 134
 135     if(!empty($allblocks)) {
 136         foreach($allblocks as $block) {
 137             if($block->visible && (!blocks_find_block($block->id, $pageblocks) || $block->multiple)) {
 138                 // And if it's applicable for display in this format...
 139                 if(blocks_name_allowed_in_format($block->name, $pageformat)) {
 140                     // ...add it to the missing blocks
 141                     $missingblocks[] = $block->id;
 142                 }
 143             }
 144         }
 145     }
 146     return $missingblocks;
 147 }
 148
 149 function blocks_remove_inappropriate($page) {
 150     $pageblocks = blocks_get_by_page($page);
 151
 152     if(empty($pageblocks)) {
 153         return;
 154     }
 155
 156     if(($pageformat = $page->get_format_name()) == NULL) {
 157         return;
 158     }
 159
 160     foreach($pageblocks as $position) {
 161         foreach($position as $instance) {
 162             $block = blocks_get_record($instance->blockid);
 163             if(!blocks_name_allowed_in_format($block->name, $pageformat)) {
 164                blocks_delete_instance($instance);
 165             }
 166         }
 167     }
 168 }
 169
 170 function blocks_name_allowed_in_format($name, $pageformat) {
 171
 172     $accept  = NULL;
 173     $depth   = -1;
 174     if ($formats = block_method_result($name, 'applicable_formats')) {
 175         foreach($formats as $format => $allowed) {
 176             $thisformat = '^'.str_replace('*', '[^-]*', $format).'.*$';
 177             if(ereg($thisformat, $pageformat)) {
 178                 if(($scount = substr_count($format, '-')) > $depth) {
 179                     $depth  = $scount;
 180                     $accept = $allowed;
 181                 }
 182             }
 183         }
 184     }
 185     if($accept === NULL) {
 186         $accept = !empty($formats['all']);
 187     }
 188     return $accept;
 189 }
 190
 191 function blocks_delete_instance($instance,$pinned=false) {
 192     global $CFG;
 193
 194     // Get the block object and call instance_delete() if possible
 195     if($record = blocks_get_record($instance->blockid)) {
 196         if($obj = block_instance($record->name, $instance)) {
 197             // Return value ignored
 198             $obj->instance_delete();
 199         }
 200     }
 201
 202     if (!empty($pinned)) {
 203          delete_records('block_pinned', 'id', $instance->id);
 204         // And now, decrement the weight of all blocks after this one
 205         execute_sql('UPDATE '.$CFG->prefix.'block_pinned SET weight = weight - 1 WHERE pagetype = \''.$instance->pagetype.
 206                     '\' AND position = \''.$instance->position.
 207                     '\' AND weight > '.$instance->weight, false);
 208     } else {
 209         // Now kill the db record;
 210         delete_records('block_instance', 'id', $instance->id);
 211         // And now, decrement the weight of all blocks after this one
 212         execute_sql('UPDATE '.$CFG->prefix.'block_instance SET weight = weight - 1 WHERE pagetype = \''.$instance->pagetype.
 213                     '\' AND pageid = '.$instance->pageid.' AND position = \''.$instance->position.
 214                     '\' AND weight > '.$instance->weight, false);
 215     }
 216     return true;
 217 }
 218
 219 // Accepts an array of block instances and checks to see if any of them have content to display
 220 // (causing them to calculate their content in the process). Returns true or false. Parameter passed
 221 // by reference for speed; the array is actually not modified.
 222 function blocks_have_content(&$pageblocks, $position) {
 223
 224     if (empty($pageblocks) || !is_array($pageblocks) || !array_key_exists($position,$pageblocks)) {
 225         return false;
 226     }
 227     // use a for() loop to get references to the array elements
 228     // foreach() cannot fetch references in PHP v4.x
 229     for ($n=0; $n<count($pageblocks[$position]);$n++) {
 230         $instance = &$pageblocks[$position][$n];
 231         if(!$instance->visible) {
 232             continue;
 233         }
 234         if(!$record = blocks_get_record($instance->blockid)) {
 235             continue;
 236         }
 237         if(!$obj = block_instance($record->name, $instance)) {
 238             continue;
 239         }
 240         if(!$obj->is_empty()) {
 241             // cache rec and obj
 242             // for blocks_print_group()
 243             $instance->rec = $record;
 244             $instance->obj = $obj;
 245             return true;
 246         }
 247     }
 248
 249     return false;
 250 }
 251
 252 // This function prints one group of blocks in a page
 253 // Parameters passed by reference for speed; they are not modified.
 254 function blocks_print_group(&$page, &$pageblocks, $position) {
 255     global $COURSE, $CFG, $USER;
 256
 257     if(empty($pageblocks[$position])) {
 258         $pageblocks[$position] = array();
 259         $maxweight = 0;
 260     }
 261     else {
 262         $maxweight = max(array_keys($pageblocks[$position]));
 263     }
 264
 265     foreach ($pageblocks[$position] as $instance) {
 266         if (!empty($instance->pinned)) {
 267             $maxweight--;
 268         }
 269     }
 270
 271     $isediting = $page->user_is_editing();
 272     foreach($pageblocks[$position] as $instance) {
 273
 274         // $instance may have ->rec and ->obj
 275         // cached from when we walked $pageblocks
 276         // in blocks_have_content()
 277         if (empty($instance->rec)) {
 278             $block = blocks_get_record($instance->blockid);
 279         } else {
 280             $block = $instance->rec;
 281         }
 282
 283         if (empty($block)) {
 284             // Block doesn't exist! We should delete this instance!
 285             continue;
 286         }
 287
 288         if(!$block->visible) {
 289             // Disabled by the admin
 290             continue;
 291         }
 292
 293         if (empty($instance->obj)) {
 294             if (!$obj = block_instance($block->name, $instance)) {
 295                 // Invalid block
 296                 continue;
 297             }
 298         } else {
 299             $obj = $instance->obj;
 300         }
 301
 302         $editalways = $page->edit_always();
 303
 304         if (($isediting  && empty($instance->pinned)) || !empty($editalways)) {
 305             $options = 0;
 306             // The block can be moved up if it's NOT the first one in its position. If it is, we look at the OR clause:
 307             // the first block might still be able to move up if the page says so (i.e., it will change position)
 308             $options |= BLOCK_MOVE_UP    * ($instance->weight != 0          || ($page->blocks_move_position($instance, BLOCK_MOVE_UP)   != $instance->position));
 309             // Same thing for downward movement
 310             $options |= BLOCK_MOVE_DOWN  * ($instance->weight != $maxweight || ($page->blocks_move_position($instance, BLOCK_MOVE_DOWN) != $instance->position));
 311             // For left and right movements, it's up to the page to tell us whether they are allowed
 312             $options |= BLOCK_MOVE_RIGHT * ($page->blocks_move_position($instance, BLOCK_MOVE_RIGHT) != $instance->position);
 313             $options |= BLOCK_MOVE_LEFT  * ($page->blocks_move_position($instance, BLOCK_MOVE_LEFT ) != $instance->position);
 314             // Finally, the block can be configured if the block class either allows multiple instances, or if it specifically
 315             // allows instance configuration (multiple instances override that one). It doesn't have anything to do with what the
 316             // administrator has allowed for this block in the site admin options.
 317             $options |= BLOCK_CONFIGURE * ( $obj->instance_allow_multiple() || $obj->instance_allow_config() );
 318             $obj->_add_edit_controls($options);
 319         }
 320
 321         if (!$instance->visible && empty($COURSE->javascriptportal)) {
 322             if ($isediting) {
 323                 $obj->_print_shadow();
 324             }
 325         } else {
 326             global $COURSE;
 327             if(!empty($COURSE->javascriptportal)) {
 328                  $COURSE->javascriptportal->currentblocksection = $position;
 329             }
 330             $obj->_print_block();
 331         }
 332         if (!empty($COURSE->javascriptportal)
 333                     && (empty($instance->pinned) || !$instance->pinned)) {
 334             $COURSE->javascriptportal->block_add('inst'.$instance->id, !$instance->visible);
 335         }
 336     } // End foreach
 337
 338     //  Check if
 339     //    we are on the default position/side AND
 340     //    we're editing the page AND
 341     //    (
 342     //      we have the capability to manage blocks OR
 343     //      we are in myMoodle page AND have the capibility to manage myMoodle blocks
 344     //    )
 345
 346     // for constant PAGE_MY_MOODLE
 347     include_once($CFG->dirroot.'/my/pagelib.php');
 348
 349     $coursecontext = get_context_instance(CONTEXT_COURSE, $COURSE->id);
 350     $myownblogpage = (isset($page->filtertype) && isset($page->filterselect) && $page->type=='blog-view' && $page->filtertype=='user' && $page->filterselect == $USER->id);
 351
 352     $managecourseblocks = has_capability('moodle/site:manageblocks', $coursecontext);
 353     $editmymoodle = $page->type == PAGE_MY_MOODLE && has_capability('moodle/my:manageblocks', $coursecontext);
 354
 355     if ($page->blocks_default_position() == $position &&
 356         $page->user_is_editing() &&
 357         ($managecourseblocks || $editmymoodle || $myownblogpage)) {
 358
 359         blocks_print_adminblock($page, $pageblocks);
 360     }
 361 }
 362
 363 // This iterates over an array of blocks and calculates the preferred width
 364 // Parameter passed by reference for speed; it's not modified.
 365 function blocks_preferred_width(&$instances) {
 366     $width = 0;
 367
 368     if(empty($instances) || !is_array($instances)) {
 369         return 0;
 370     }
 371
 372     $blocks = blocks_get_record();
 373
 374     foreach($instances as $instance) {
 375         if(!$instance->visible) {
 376             continue;
 377         }
 378
 379         if (!array_key_exists($instance->blockid, $blocks)) {
 380             // Block doesn't exist! We should delete this instance!
 381             continue;
 382         }
 383
 384         if(!$blocks[$instance->blockid]->visible) {
 385             continue;
 386         }
 387         $pref = block_method_result($blocks[$instance->blockid]->name, 'preferred_width');
 388         if($pref === NULL) {
 389             continue;
 390         }
 391         if($pref > $width) {
 392             $width = $pref;
 393         }
 394     }
 395     return $width;
 396 }
 397
 398 function blocks_get_record($blockid = NULL, $invalidate = false) {
 399     static $cache = NULL;
 400
 401     if($invalidate || empty($cache)) {
 402         $cache = get_records('block');
 403     }
 404
 405     if($blockid === NULL) {
 406         return $cache;
 407     }
 408
 409     return (isset($cache[$blockid])? $cache[$blockid] : false);
 410 }
 411
 412 function blocks_find_block($blockid, $blocksarray) {
 413     if (empty($blocksarray)) {
 414         return false;
 415     }
 416     foreach($blocksarray as $blockgroup) {
 417         if (empty($blockgroup)) {
 418             continue;
 419         }
 420         foreach($blockgroup as $instance) {
 421             if($instance->blockid == $blockid) {
 422                 return $instance;
 423             }
 424         }
 425     }
 426     return false;
 427 }
 428
 429 function blocks_find_instance($instanceid, $blocksarray) {
 430     foreach($blocksarray as $subarray) {
 431         foreach($subarray as $instance) {
 432             if($instance->id == $instanceid) {
 433                 return $instance;
 434             }
 435         }
 436     }
 437     return false;
 438 }
 439
 440 // Simple entry point for anyone that wants to use blocks
 441 function blocks_setup(&$PAGE,$pinned=BLOCKS_PINNED_FALSE) {
 442     switch ($pinned) {
 443     case BLOCKS_PINNED_TRUE:
 444         $pageblocks = blocks_get_pinned($PAGE);
 445         break;
 446     case BLOCKS_PINNED_BOTH:
 447         $pageblocks = blocks_get_by_page_pinned($PAGE);
 448         break;
 449     case BLOCKS_PINNED_FALSE:
 450     default:
 451         $pageblocks = blocks_get_by_page($PAGE);
 452         break;
 453     }
 454     blocks_execute_url_action($PAGE, $pageblocks,($pinned==BLOCKS_PINNED_TRUE));
 455     return $pageblocks;
 456 }
 457
 458 function blocks_execute_action($page, &$pageblocks, $blockaction, $instanceorid, $pinned=false, $redirect=true) {
 459     global $CFG;
 460
 461     if (is_int($instanceorid)) {
 462         $blockid = $instanceorid;
 463     } else if (is_object($instanceorid)) {
 464         $instance = $instanceorid;
 465     }
 466
 467     switch($blockaction) {
 468         case 'config':
 469             global $USER;
 470             $block = blocks_get_record($instance->blockid);
 471             // Hacky hacky tricky stuff to get the original human readable block title,
 472             // even if the block has configured its title to be something else.
 473             // Create the object WITHOUT instance data.
 474             $blockobject = block_instance($block->name);
 475             if ($blockobject === false) {
 476                 break;
 477             }
 478
 479             // First of all check to see if the block wants to be edited
 480             if(!$blockobject->user_can_edit()) {
 481                 break;
 482             }
 483
 484             // Now get the title and AFTER that load up the instance
 485             $blocktitle = $blockobject->get_title();
 486             $blockobject->_load_instance($instance);
 487
 488             optional_param('submitted', 0, PARAM_INT);
 489
 490             // Define the data we're going to silently include in the instance config form here,
 491             // so we can strip them from the submitted data BEFORE serializing it.
 492             $hiddendata = array(
 493                 'sesskey' => $USER->sesskey,
 494                 'instanceid' => $instance->id,
 495                 'blockaction' => 'config'
 496             );
 497
 498             // To this data, add anything the page itself needs to display
 499             $hiddendata = array_merge($hiddendata, $page->url_get_parameters());
 500
 501             if($data = data_submitted()) {
 502                 $remove = array_keys($hiddendata);
 503                 foreach($remove as $item) {
 504                     unset($data->$item);
 505                 }
 506                 if(!$blockobject->instance_config_save($data,$pinned)) {
 507                     error('Error saving block configuration');
 508                 }
 509                 // And nothing more, continue with displaying the page
 510             }
 511             else {
 512                 // We need to show the config screen, so we highjack the display logic and then die
 513                 $strheading = get_string('blockconfiga', 'moodle', $blocktitle);
 514                 $page->print_header(get_string('pageheaderconfigablock', 'moodle'), array($strheading => ''));
 515
 516                 echo '<div class="block-config" id="'.$block->name.'">';   /// Make CSS easier
 517
 518                 print_heading($strheading);
 519                 echo '<form method="post" action="'. $page->url_get_path() .'">';
 520                 echo '<p>';
 521                 foreach($hiddendata as $name => $val) {
 522                     echo '<input type="hidden" name="'. $name .'" value="'. $val .'" />';
 523                 }
 524                 echo '</p>';
 525                 $blockobject->instance_config_print();
 526                 echo '</form>';
 527
 528                 echo '</div>';
 529                 $CFG->pagepath = 'blocks/' . $block->name;
 530                 print_footer();
 531                 die(); // Do not go on with the other page-related stuff
 532             }
 533         break;
 534         case 'toggle':
 535             if(empty($instance))  {
 536                 error('Invalid block instance for '.$blockaction);
 537             }
 538             $instance->visible = ($instance->visible) ? 0 : 1;
 539             if (!empty($pinned)) {
 540                 update_record('block_pinned', $instance);
 541             } else {
 542                 update_record('block_instance', $instance);
 543             }
 544         break;
 545         case 'delete':
 546             if(empty($instance))  {
 547                 error('Invalid block instance for '. $blockaction);
 548             }
 549             blocks_delete_instance($instance, $pinned);
 550         break;
 551         case 'moveup':
 552             if(empty($instance))  {
 553                 error('Invalid block instance for '. $blockaction);
 554             }
 555
 556             if($instance->weight == 0) {
 557                 // The block is the first one, so a move "up" probably means it changes position
 558                 // Where is the instance going to be moved?
 559                 $newpos = $page->blocks_move_position($instance, BLOCK_MOVE_UP);
 560                 $newweight = (empty($pageblocks[$newpos]) ? 0 : max(array_keys($pageblocks[$newpos])) + 1);
 561
 562                 blocks_execute_repositioning($instance, $newpos, $newweight, $pinned);
 563             }
 564             else {
 565                 // The block is just moving upwards in the same position.
 566                 // This configuration will make sure that even if somehow the weights
 567                 // become not continuous, block move operations will eventually bring
 568                 // the situation back to normal without printing any warnings.
 569                 if(!empty($pageblocks[$instance->position][$instance->weight - 1])) {
 570                     $other = $pageblocks[$instance->position][$instance->weight - 1];
 571                 }
 572                 if(!empty($other)) {
 573                     ++$other->weight;
 574                     if (!empty($pinned)) {
 575                         update_record('block_pinned', $other);
 576                     } else {
 577                         update_record('block_instance', $other);
 578                     }
 579                 }
 580                 --$instance->weight;
 581                 if (!empty($pinned)) {
 582                     update_record('block_pinned', $instance);
 583                 } else {
 584                     update_record('block_instance', $instance);
 585                 }
 586             }
 587         break;
 588         case 'movedown':
 589             if(empty($instance))  {
 590                 error('Invalid block instance for '. $blockaction);
 591             }
 592
 593             if($instance->weight == max(array_keys($pageblocks[$instance->position]))) {
 594                 // The block is the last one, so a move "down" probably means it changes position
 595                 // Where is the instance going to be moved?
 596                 $newpos = $page->blocks_move_position($instance, BLOCK_MOVE_DOWN);
 597                 $newweight = (empty($pageblocks[$newpos]) ? 0 : max(array_keys($pageblocks[$newpos])) + 1);
 598
 599                 blocks_execute_repositioning($instance, $newpos, $newweight, $pinned);
 600             }
 601             else {
 602                 // The block is just moving downwards in the same position.
 603                 // This configuration will make sure that even if somehow the weights
 604                 // become not continuous, block move operations will eventually bring
 605                 // the situation back to normal without printing any warnings.
 606                 if(!empty($pageblocks[$instance->position][$instance->weight + 1])) {
 607                     $other = $pageblocks[$instance->position][$instance->weight + 1];
 608                 }
 609                 if(!empty($other)) {
 610                     --$other->weight;
 611                     if (!empty($pinned)) {
 612                         update_record('block_pinned', $other);
 613                     } else {
 614                         update_record('block_instance', $other);
 615                     }
 616                 }
 617                 ++$instance->weight;
 618                 if (!empty($pinned)) {
 619                     update_record('block_pinned', $instance);
 620                 } else {
 621                     update_record('block_instance', $instance);
 622                 }
 623             }
 624         break;
 625         case 'moveleft':
 626             if(empty($instance))  {
 627                 error('Invalid block instance for '. $blockaction);
 628             }
 629
 630             // Where is the instance going to be moved?
 631             $newpos = $page->blocks_move_position($instance, BLOCK_MOVE_LEFT);
 632             $newweight = (empty($pageblocks[$newpos]) ? 0 : max(array_keys($pageblocks[$newpos])) + 1);
 633
 634             blocks_execute_repositioning($instance, $newpos, $newweight, $pinned);
 635         break;
 636         case 'moveright':
 637             if(empty($instance))  {
 638                 error('Invalid block instance for '. $blockaction);
 639             }
 640
 641             // Where is the instance going to be moved?
 642             $newpos    = $page->blocks_move_position($instance, BLOCK_MOVE_RIGHT);
 643             $newweight = (empty($pageblocks[$newpos]) ? 0 : max(array_keys($pageblocks[$newpos])) + 1);
 644
 645             blocks_execute_repositioning($instance, $newpos, $newweight, $pinned);
 646         break;
 647         case 'add':
 648             // Add a new instance of this block, if allowed
 649             $block = blocks_get_record($blockid);
 650
 651             if(empty($block) || !$block->visible) {
 652                 // Only allow adding if the block exists and is enabled
 653                 break;
 654             }
 655
 656             if(!$block->multiple && blocks_find_block($blockid, $pageblocks) !== false) {
 657                 // If no multiples are allowed and we already have one, return now
 658                 break;
 659             }
 660
 661             if(!block_method_result($block->name, 'user_can_addto', $page)) {
 662                 // If the block doesn't want to be added...
 663                 break;
 664             }
 665
 666             $newpos = $page->blocks_default_position();
 667             if (!empty($pinned)) {
 668                 $sql = 'SELECT 1, max(weight) + 1 AS nextfree FROM '. $CFG->prefix .'block_pinned WHERE '
 669                     .' pagetype = \''. $page->get_type() .'\' AND position = \''. $newpos .'\'';
 670             } else {
 671                 $sql = 'SELECT 1, max(weight) + 1 AS nextfree FROM '. $CFG->prefix .'block_instance WHERE pageid = '. $page->get_id()
 672                     .' AND pagetype = \''. $page->get_type() .'\' AND position = \''. $newpos .'\'';
 673             }
 674             $weight = get_record_sql($sql);
 675
 676             $newinstance = new stdClass;
 677             $newinstance->blockid    = $blockid;
 678             if (empty($pinned)) {
 679                 $newinstance->pageid = $page->get_id();
 680             }
 681             $newinstance->pagetype   = $page->get_type();
 682             $newinstance->position   = $newpos;
 683             $newinstance->weight     = empty($weight->nextfree) ? 0 : $weight->nextfree;
 684             $newinstance->visible    = 1;
 685             $newinstance->configdata = '';
 686             if (!empty($pinned)) {
 687                 $newinstance->id = insert_record('block_pinned', $newinstance);
 688             } else {
 689                 $newinstance->id = insert_record('block_instance', $newinstance);
 690             }
 691
 692             // If the new instance was created, allow it to do additional setup
 693             if($newinstance && ($obj = block_instance($block->name, $newinstance))) {
 694                 // Return value ignored
 695                 $obj->instance_create();
 696             }
 697
 698         break;
 699     }
 700
 701     if ($redirect) {
 702         // In order to prevent accidental duplicate actions, redirect to a page with a clean url
 703         redirect($page->url_get_full());
 704     }
 705 }
 706
 707 // You can use this to get the blocks to respond to URL actions without much hassle
 708 function blocks_execute_url_action(&$PAGE, &$pageblocks,$pinned=false) {
 709     $blockaction = optional_param('blockaction', '', PARAM_ALPHA);
 710
 711     if (empty($blockaction) || !$PAGE->user_allowed_editing() || !confirm_sesskey()) {
 712         return;
 713     }
 714
 715     $instanceid  = optional_param('instanceid', 0, PARAM_INT);
 716     $blockid     = optional_param('blockid',    0, PARAM_INT);
 717
 718     if (!empty($blockid)) {
 719         blocks_execute_action($PAGE, $pageblocks, strtolower($blockaction), $blockid, $pinned);
 720
 721     }
 722     else if (!empty($instanceid)) {
 723         $instance = blocks_find_instance($instanceid, $pageblocks);
 724         blocks_execute_action($PAGE, $pageblocks, strtolower($blockaction), $instance, $pinned);
 725     }
 726 }
 727
 728 // This shouldn't be used externally at all, it's here for use by blocks_execute_action()
 729 // in order to reduce code repetition.
 730 function blocks_execute_repositioning(&$instance, $newpos, $newweight, $pinned=false) {
 731     global $CFG;
 732
 733     // If it's staying where it is, don't do anything, unless overridden
 734     if ($newpos == $instance->position) {
 735         return;
 736     }
 737
 738     // Close the weight gap we 'll leave behind
 739     if (!empty($pinned)) {
 740         $sql = 'UPDATE '. $CFG->prefix .'block_instance SET weight = weight - 1 '.
 741                         'WHERE pagetype = \''. $instance->pagetype.
 742                         '\' AND position = \'' .$instance->position.
 743                         '\' AND weight > '. $instance->weight;
 744     } else {
 745         $sql = 'UPDATE '. $CFG->prefix .'block_instance SET weight = weight - 1 '.
 746                         'WHERE pagetype = \''. $instance->pagetype.
 747                         '\' AND pageid = '. $instance->pageid .
 748                         ' AND position = \'' .$instance->position.
 749                         '\' AND weight > '. $instance->weight;
 750     }
 751     execute_sql($sql,false);
 752
 753     $instance->position = $newpos;
 754     $instance->weight   = $newweight;
 755
 756     if (!empty($pinned)) {
 757         update_record('block_pinned', $instance);
 758     } else {
 759         update_record('block_instance', $instance);
 760     }
 761 }
 762
 763
 764 /**
 765  * Moves a block to the new position (column) and weight (sort order).
 766  * @param $instance - The block instance to be moved.
 767  * @param $destpos - BLOCK_POS_LEFT or BLOCK_POS_RIGHT. The destination column.
 768  * @param $destweight - The destination sort order. If NULL, we add to the end
 769  *                      of the destination column.
 770  * @param $pinned - Are we moving pinned blocks? We can only move pinned blocks
 771  *                  to a new position withing the pinned list. Likewise, we
 772  *                  can only moved non-pinned blocks to a new position within
 773  *                  the non-pinned list.
 774  * @return boolean (success or failure).
 775  */
 776 function blocks_move_block($page, &$instance, $destpos, $destweight=NULL, $pinned=false) {
 777     global $CFG;
 778
 779     if ($pinned) {
 780         $blocklist = blocks_get_pinned($page);
 781     } else {
 782         $blocklist = blocks_get_by_page($page);
 783     }
 784
 785     if ($blocklist[$instance->position][$instance->weight]->id != $instance->id) {
 786         // The source block instance is not where we think it is.
 787         return false;
 788     }
 789
 790     // First we close the gap that will be left behind when we take out the
 791     // block from it's current column.
 792     if ($pinned) {
 793         $closegapsql = "UPDATE {$CFG->prefix}block_instance
 794                            SET weight = weight - 1
 795                          WHERE weight > '$instance->weight'
 796                            AND position = '$instance->position'
 797                            AND pagetype = '$instance->pagetype'";
 798     } else {
 799         $closegapsql = "UPDATE {$CFG->prefix}block_instance
 800                            SET weight = weight - 1
 801                          WHERE weight > '$instance->weight'
 802                            AND position = '$instance->position'
 803                            AND pagetype = '$instance->pagetype'
 804                            AND pageid = '$instance->pageid'";
 805     }
 806     if (!execute_sql($closegapsql, false)) {
 807         return false;
 808     }
 809
 810     // Now let's make space for the block being moved.
 811     if ($pinned) {
 812         $opengapsql = "UPDATE {$CFG->prefix}block_instance
 813                            SET weight = weight + 1
 814                          WHERE weight >= '$destweight'
 815                            AND position = '$destpos'
 816                            AND pagetype = '$instance->pagetype'";
 817     } else {
 818         $opengapsql = "UPDATE {$CFG->prefix}block_instance
 819                            SET weight = weight + 1
 820                          WHERE weight >= '$destweight'
 821                            AND position = '$destpos'
 822                            AND pagetype = '$instance->pagetype'
 823                            AND pageid = '$instance->pageid'";
 824     }
 825     if (!execute_sql($opengapsql, false)) {
 826         return false;
 827     }
 828
 829     // Move the block.
 830     $instance->position = $destpos;
 831     $instance->weight   = $destweight;
 832
 833     if ($pinned) {
 834         $table = 'block_pinned';
 835     } else {
 836         $table = 'block_instance';
 837     }
 838     return update_record($table, $instance);
 839 }
 840
 841
 842 /**
 843  * Returns an array consisting of 2 arrays:
 844  * 1) Array of pinned blocks for position BLOCK_POS_LEFT
 845  * 2) Array of pinned blocks for position BLOCK_POS_RIGHT
 846  */
 847 function blocks_get_pinned($page) {
 848
 849     $visible = true;
 850
 851     if (method_exists($page,'edit_always')) {
 852         if ($page->edit_always()) {
 853             $visible = false;
 854         }
 855     }
 856
 857     $blocks = get_records_select('block_pinned', 'pagetype = \''. $page->get_type() .
 858                     '\''.(($visible) ? 'AND visible = 1' : ''), 'position, weight');
 859
 860     $positions = $page->blocks_get_positions();
 861     $arr = array();
 862
 863     foreach($positions as $key => $position) {
 864         $arr[$position] = array();
 865     }
 866
 867     if(empty($blocks)) {
 868         return $arr;
 869     }
 870
 871     foreach($blocks as $block) {
 872         $block->pinned = true; // so we know we can't move it.
 873         // make up an instanceid if we can..
 874         $block->pageid = $page->get_id();
 875         $arr[$block->position][$block->weight] = $block;
 876     }
 877
 878     return $arr;
 879 }
 880
 881
 882 /**
 883  * Similar to blocks_get_by_page(), except that, the array returned includes
 884  * pinned blocks as well. Pinned blocks are always appended before normal
 885  * block instances.
 886  */
 887 function blocks_get_by_page_pinned($page) {
 888     $pinned = blocks_get_pinned($page);
 889     $user = blocks_get_by_page($page);
 890
 891     $weights = array();
 892
 893     foreach ($pinned as $pos => $arr) {
 894         $weights[$pos] = count($arr);
 895     }
 896
 897     foreach ($user as $pos => $blocks) {
 898         if (!array_key_exists($pos,$pinned)) {
 899              $pinned[$pos] = array();
 900         }
 901         if (!array_key_exists($pos,$weights)) {
 902             $weights[$pos] = 0;
 903         }
 904         foreach ($blocks as $block) {
 905             $pinned[$pos][$weights[$pos]] = $block;
 906             $weights[$pos]++;
 907         }
 908     }
 909     return $pinned;
 910 }
 911
 912
 913 /**
 914  * Returns an array of blocks for the page. Pinned blocks are excluded.
 915  */
 916 function blocks_get_by_page($page) {
 917     $blocks = get_records_select('block_instance', "pageid = '". $page->get_id() .
 918                 "' AND pagetype = '". $page->get_type() ."'", 'position, weight');
 919
 920     $positions = $page->blocks_get_positions();
 921     $arr = array();
 922     foreach($positions as $key => $position) {
 923         $arr[$position] = array();
 924     }
 925
 926     if(empty($blocks)) {
 927         return $arr;
 928     }
 929
 930     foreach($blocks as $block) {
 931         $arr[$block->position][$block->weight] = $block;
 932     }
 933     return $arr;
 934 }
 935
 936
 937 //This function prints the block to admin blocks as necessary
 938 function blocks_print_adminblock(&$page, &$pageblocks) {
 939     global $USER;
 940
 941     $missingblocks = blocks_get_missing($page, $pageblocks);
 942
 943     if (!empty($missingblocks)) {
 944         $strblocks = get_string('blocks');
 945         $stradd    = get_string('add');
 946         foreach ($missingblocks as $blockid) {
 947             $block = blocks_get_record($blockid);
 948             $blockobject = block_instance($block->name);
 949             if ($blockobject === false) {
 950                 continue;
 951             }
 952             if(!$blockobject->user_can_addto($page)) {
 953                 continue;
 954             }
 955             $menu[$block->id] = $blockobject->get_title();
 956         }
 957         asort($menu);
 958
 959         $target = $page->url_get_full(array('sesskey' => $USER->sesskey, 'blockaction' => 'add'));
 960         $content = popup_form($target.'&amp;blockid=', $menu, 'add_block', '', $stradd .'...', '', '', true);
 961         print_side_block($strblocks, $content, NULL, NULL, NULL, array('class' => 'block_adminblock'));
 962     }
 963 }
 964
 965 function blocks_repopulate_page($page) {
 966     global $CFG;
 967
 968     $allblocks = blocks_get_record();
 969
 970     if(empty($allblocks)) {
 971         error('Could not retrieve blocks from the database');
 972     }
 973
 974     // Assemble the information to correlate block names to ids
 975     $idforname = array();
 976     foreach($allblocks as $block) {
 977         $idforname[$block->name] = $block->id;
 978     }
 979
 980     /// If the site override has been defined, it is the only valid one.
 981     if (!empty($CFG->defaultblocks_override)) {
 982         $blocknames = $CFG->defaultblocks_override;
 983     }
 984     else {
 985         $blocknames = $page->blocks_get_default();
 986     }
 987
 988     $positions = $page->blocks_get_positions();
 989     $posblocks = explode(':', $blocknames);
 990
 991     // Now one array holds the names of the positions, and the other one holds the blocks
 992     // that are going to go in each position. Luckily for us, both arrays are numerically
 993     // indexed and the indexes match, so we can work straight away... but CAREFULLY!
 994
 995     // Ready to start creating block instances, but first drop any existing ones
 996     delete_records('block_instance', 'pageid', $page->get_id(), 'pagetype', $page->get_type());
 997
 998     // Here we slyly count $posblocks and NOT $positions. This can actually make a difference
 999     // if the textual representation has undefined slots in the end. So we only work with as many
1000     // positions were retrieved, not with all the page says it has available.
1001     $numpositions = count($posblocks);
1002     for($i = 0; $i < $numpositions; ++$i) {
1003         $position = $positions[$i];
1004         $blocknames = explode(',', $posblocks[$i]);
1005         $weight = 0;
1006         foreach($blocknames as $blockname) {
1007             $newinstance = new stdClass;
1008             $newinstance->blockid    = $idforname[$blockname];
1009             $newinstance->pageid     = $page->get_id();
1010             $newinstance->pagetype   = $page->get_type();
1011             $newinstance->position   = $position;
1012             $newinstance->weight     = $weight;
1013             $newinstance->visible    = 1;
1014             $newinstance->configdata = '';
1015
1016             if(!empty($newinstance->blockid)) {
1017                 // Only add block if it was recognized
1018                 insert_record('block_instance', $newinstance);
1019                 ++$weight;
1020             }
1021         }
1022     }
1023
1024     return true;
1025 }
1026
1027 function upgrade_blocks_db($continueto) {
1028 /// This function upgrades the blocks tables, if necessary
1029 /// It's called from admin/index.php
1030
1031     global $CFG, $db;
1032
1033     require_once ($CFG->dirroot .'/blocks/version.php');  // Get code versions
1034
1035     if (empty($CFG->blocks_version)) {                  // Blocks have never been installed.
1036         $strdatabaseupgrades = get_string('databaseupgrades');
1037         print_header($strdatabaseupgrades, $strdatabaseupgrades, $strdatabaseupgrades, '',
1038                 upgrade_get_javascript(), false, '&nbsp;', '&nbsp;');
1039
1040         upgrade_log_start();
1041         print_heading('blocks');
1042         $db->debug=true;
1043
1044     /// Both old .sql files and new install.xml are supported
1045     /// but we priorize install.xml (XMLDB) if present
1046         $status = false;
1047         if (file_exists($CFG->dirroot . '/blocks/db/install.xml')) {
1048             $status = install_from_xmldb_file($CFG->dirroot . '/blocks/db/install.xml'); //New method
1049         } else if (file_exists($CFG->dirroot . '/blocks/db/' . $CFG->dbtype . '.sql')) {
1050             $status = modify_database($CFG->dirroot . '/blocks/db/' . $CFG->dbtype . '.sql'); //Old method
1051         }
1052
1053         $db->debug = false;
1054         if ($status) {
1055             if (set_config('blocks_version', $blocks_version)) {
1056                 notify(get_string('databasesuccess'), 'notifysuccess');
1057                 notify(get_string('databaseupgradeblocks', '', $blocks_version), 'notifysuccess');
1058                 print_continue($continueto);
1059                 print_footer('none');
1060                 exit;
1061             } else {
1062                 error('Upgrade of blocks system failed! (Could not update version in config table)');
1063             }
1064         } else {
1065             error('Blocks tables could NOT be set up successfully!');
1066         }
1067     }
1068
1069 /// Upgrading code starts here
1070     $oldupgrade = false;
1071     $newupgrade = false;
1072     if (is_readable($CFG->dirroot . '/blocks/db/' . $CFG->dbtype . '.php')) {
1073         include_once($CFG->dirroot . '/blocks/db/' . $CFG->dbtype . '.php');  // defines old upgrading function
1074         $oldupgrade = true;
1075     }
1076     if (is_readable($CFG->dirroot . '/blocks/db/upgrade.php')) {
1077         include_once($CFG->dirroot . '/blocks/db/upgrade.php');  // defines new upgrading function
1078         $newupgrade = true;
1079     }
1080
1081     if ($blocks_version > $CFG->blocks_version) {       // Upgrade tables
1082         $strdatabaseupgrades = get_string('databaseupgrades');
1083         print_header($strdatabaseupgrades, $strdatabaseupgrades, $strdatabaseupgrades, '', upgrade_get_javascript());
1084
1085         upgrade_log_start();
1086         print_heading('blocks');
1087
1088     /// Run de old and new upgrade functions for the module
1089         $oldupgrade_function = 'blocks_upgrade';
1090         $newupgrade_function = 'xmldb_blocks_upgrade';
1091
1092     /// First, the old function if exists
1093         $oldupgrade_status = true;
1094         if ($oldupgrade && function_exists($oldupgrade_function)) {
1095             $db->debug = true;
1096             $oldupgrade_status = $oldupgrade_function($CFG->blocks_version);
1097         } else if ($oldupgrade) {
1098             notify ('Upgrade function ' . $oldupgrade_function . ' was not available in ' .
1099                      '/blocks/db/' . $CFG->dbtype . '.php');
1100         }
1101
1102     /// Then, the new function if exists and the old one was ok
1103         $newupgrade_status = true;
1104         if ($newupgrade && function_exists($newupgrade_function) && $oldupgrade_status) {
1105             $db->debug = true;
1106             $newupgrade_status = $newupgrade_function($CFG->blocks_version);
1107         } else if ($newupgrade) {
1108             notify ('Upgrade function ' . $newupgrade_function . ' was not available in ' .
1109                      '/blocks/db/upgrade.php');
1110         }
1111
1112         $db->debug=false;
1113     /// Now analyze upgrade results
1114         if ($oldupgrade_status && $newupgrade_status) {    // No upgrading failed
1115             if (set_config('blocks_version', $blocks_version)) {
1116                 notify(get_string('databasesuccess'), 'notifysuccess');
1117                 notify(get_string('databaseupgradeblocks', '', $blocks_version), 'notifysuccess');
1118                 print_continue($continueto);
1119                 print_footer('none');
1120                 exit;
1121             } else {
1122                 error('Upgrade of blocks system failed! (Could not update version in config table)');
1123             }
1124         } else {
1125             error('Upgrade failed!  See blocks/version.php');
1126         }
1127
1128     } else if ($blocks_version < $CFG->blocks_version) {
1129         upgrade_log_start();
1130         notify('WARNING!!!  The Blocks version you are using is OLDER than the version that made these databases!');
1131     }
1132     upgrade_log_finish();
1133 }
1134
1135 //This function finds all available blocks and install them
1136 //into blocks table or do all the upgrade process if newer
1137 function upgrade_blocks_plugins($continueto) {
1138
1139     global $CFG, $db;
1140
1141     $blocktitles = array();
1142     $invalidblocks = array();
1143     $validblocks = array();
1144     $notices = array();
1145
1146     //Count the number of blocks in db
1147     $blockcount = count_records('block');
1148     //If there isn't records. This is the first install, so I remember it
1149     if ($blockcount == 0) {
1150         $first_install = true;
1151     } else {
1152         $first_install = false;
1153     }
1154
1155     $site = get_site();
1156
1157     if (!$blocks = get_list_of_plugins('blocks', 'db') ) {
1158         error('No blocks installed!');
1159     }
1160
1161     include_once($CFG->dirroot .'/blocks/moodleblock.class.php');
1162     if(!class_exists('block_base')) {
1163         error('Class block_base is not defined or file not found for /blocks/moodleblock.class.php');
1164     }
1165
1166     foreach ($blocks as $blockname) {
1167
1168         if ($blockname == 'NEWBLOCK') {   // Someone has unzipped the template, ignore it
1169             continue;
1170         }
1171
1172         if(!block_is_compatible($blockname)) {
1173             // This is an old-style block
1174             //$notices[] = 'Block '. $blockname .' is not compatible with the current version of Mooodle and needs to be updated by a programmer.';
1175             $invalidblocks[] = $blockname;
1176             continue;
1177         }
1178
1179         $fullblock = $CFG->dirroot .'/blocks/'. $blockname;
1180
1181         if ( is_readable($fullblock.'/block_'.$blockname.'.php')) {
1182             include_once($fullblock.'/block_'.$blockname.'.php');
1183         } else {
1184             $notices[] = 'Block '. $blockname .': '. $fullblock .'/block_'. $blockname .'.php was not readable';
1185             continue;
1186         }
1187
1188         $oldupgrade = false;
1189         $newupgrade = false;
1190         if ( @is_dir($fullblock .'/db/')) {
1191             if ( @is_readable($fullblock .'/db/'. $CFG->dbtype .'.php')) {
1192                 include_once($fullblock .'/db/'. $CFG->dbtype .'.php');  // defines old upgrading function
1193                 $oldupgrade = true;
1194             }
1195             if ( @is_readable($fullblock .'/db/upgrade.php')) {
1196                 include_once($fullblock .'/db/upgrade.php');  // defines new upgrading function
1197                 $newupgrade = true;
1198             }
1199         }
1200
1201         $classname = 'block_'.$blockname;
1202         if(!class_exists($classname)) {
1203             $notices[] = 'Block '. $blockname .': '. $classname .' not implemented';
1204             continue;
1205         }
1206
1207         // Here is the place to see if the block implements a constructor (old style),
1208         // an init() function (new style) or nothing at all (error time).
1209
1210         $constructor = get_class_constructor($classname);
1211         if(empty($constructor)) {
1212             // No constructor
1213             $notices[] = 'Block '. $blockname .': class does not have a constructor';
1214             $invalidblocks[] = $blockname;
1215             continue;
1216         }
1217
1218         $block    = new stdClass;     // This may be used to update the db below
1219         $blockobj = new $classname;   // This is what we 'll be testing
1220
1221         // Inherits from block_base?
1222         if(!is_subclass_of($blockobj, 'block_base')) {
1223             $notices[] = 'Block '. $blockname .': class does not inherit from block_base';
1224             continue;
1225         }
1226
1227         // OK, it's as we all hoped. For further tests, the object will do them itself.
1228         if(!$blockobj->_self_test()) {
1229             $notices[] = 'Block '. $blockname .': self test failed';
1230             continue;
1231         }
1232         $block->version = $blockobj->get_version();
1233
1234         if (!isset($block->version)) {
1235             $notices[] = 'Block '. $blockname .': has no version support. It must be updated by a programmer.';
1236             continue;
1237         }
1238
1239         $block->name = $blockname;   // The name MUST match the directory
1240         $blocktitle = $blockobj->get_title();
1241
1242         if ($currblock = get_record('block', 'name', $block->name)) {
1243             if ($currblock->version == $block->version) {
1244                 // do nothing
1245             } else if ($currblock->version < $block->version) {
1246                 if (empty($updated_blocks)) {
1247                     $strblocksetup    = get_string('blocksetup');
1248                     print_header($strblocksetup, $strblocksetup, $strblocksetup, '',
1249                             upgrade_get_javascript(), false, '&nbsp;', '&nbsp;');
1250                 }
1251                 $updated_blocks = true;
1252                 upgrade_log_start();
1253                 print_heading('New version of '.$blocktitle.' ('.$block->name.') exists');
1254                 @set_time_limit(0);  // To allow slow databases to complete the long SQL
1255
1256             /// Run de old and new upgrade functions for the module
1257                 $oldupgrade_function = $block->name .'_upgrade';
1258                 $newupgrade_function = 'xmldb_block_' . $block->name .'_upgrade';
1259
1260             /// First, the old function if exists
1261                 $oldupgrade_status = true;
1262                 if ($oldupgrade && function_exists($oldupgrade_function)) {
1263                     $db->debug = true;
1264                     $oldupgrade_status = $oldupgrade_function($currblock->version, $block);
1265                 } else if ($oldupgrade) {
1266                     notify ('Upgrade function ' . $oldupgrade_function . ' was not available in ' .
1267                              $fullblock . '/db/' . $CFG->dbtype . '.php');
1268                 }
1269
1270             /// Then, the new function if exists and the old one was ok
1271                 $newupgrade_status = true;
1272                 if ($newupgrade && function_exists($newupgrade_function) && $oldupgrade_status) {
1273                     $db->debug = true;
1274                     $newupgrade_status = $newupgrade_function($currblock->version, $block);
1275                 } else if ($newupgrade) {
1276                     notify ('Upgrade function ' . $newupgrade_function . ' was not available in ' .
1277                              $fullblock . '/db/upgrade.php');
1278                 }
1279
1280                 $db->debug=false;
1281             /// Now analyze upgrade results
1282                 if ($oldupgrade_status && $newupgrade_status) {    // No upgrading failed
1283                     // OK so far, now update the block record
1284                     $block->id = $currblock->id;
1285                     if (! update_record('block', $block)) {
1286                         error('Could not update block '. $block->name .' record in block table!');
1287                     }
1288                     $component = 'block/'.$block->name;
1289                     if (!update_capabilities($component)) {
1290                         error('Could not update '.$block->name.' capabilities!');
1291                     }
1292
1293                     events_update_definition($component);
1294                     notify(get_string('blocksuccess', '', $blocktitle), 'notifysuccess');
1295                 } else {
1296                     notify('Upgrading block '. $block->name .' from '. $currblock->version .' to '. $block->version .' FAILED!');
1297                 }
1298                 echo '<hr />';
1299             } else {
1300                 upgrade_log_start();
1301                 error('Version mismatch: block '. $block->name .' can\'t downgrade '. $currblock->version .' -> '. $block->version .'!');
1302             }
1303
1304         } else {    // block not installed yet, so install it
1305
1306             // If it allows multiples, start with it enabled
1307             $block->multiple = $blockobj->instance_allow_multiple();
1308             if (!empty($blockobj->cron)) {
1309                 $block->cron = $blockobj->cron;
1310             }
1311
1312             // [pj] Normally this would be inline in the if, but we need to
1313             //      check for NULL (necessary for 4.0.5 <= PHP < 4.2.0)
1314             $conflictblock = array_search($blocktitle, $blocktitles);
1315             if($conflictblock !== false && $conflictblock !== NULL) {
1316                 // Duplicate block titles are not allowed, they confuse people
1317                 // AND PHP's associative arrays ;)
1318                 error('<strong>Naming conflict</strong>: block <strong>'.$block->name.'</strong> has the same title with an existing block, <strong>'.$conflictblock.'</strong>!');
1319             }
1320             if (empty($updated_blocks)) {
1321                 $strblocksetup    = get_string('blocksetup');
1322                 print_header($strblocksetup, $strblocksetup, $strblocksetup, '',
1323                         upgrade_get_javascript(), false, '&nbsp;', '&nbsp;');
1324             }
1325             $updated_blocks = true;
1326             upgrade_log_start();
1327             print_heading($block->name);
1328             $db->debug = true;
1329             @set_time_limit(0);  // To allow slow databases to complete the long SQL
1330
1331         /// Both old .sql files and new install.xml are supported
1332         /// but we priorize install.xml (XMLDB) if present
1333             $status = false;
1334             if (file_exists($fullblock . '/db/install.xml')) {
1335                 $status = install_from_xmldb_file($fullblock . '/db/install.xml'); //New method
1336             } else if (file_exists($fullblock .'/db/'. $CFG->dbtype .'.sql')) {
1337                 $status = modify_database($fullblock .'/db/'. $CFG->dbtype .'.sql'); //Old method
1338             } else {
1339                 $status = true;
1340             }
1341
1342             $db->debug = false;
1343             if ($status) {
1344                 if ($block->id = insert_record('block', $block)) {
1345                     $blockobj->after_install();
1346                     $component = 'block/'.$block->name;
1347                     if (!update_capabilities($component)) {
1348                         notify('Could not set up '.$block->name.' capabilities!');
1349                     }
1350
1351                     events_update_definition($component);
1352                     notify(get_string('blocksuccess', '', $blocktitle), 'notifysuccess');
1353                     echo '<hr />';
1354                 } else {
1355                     error($block->name .' block could not be added to the block list!');
1356                 }
1357             } else {
1358                 error('Block '. $block->name .' tables could NOT be set up successfully!');
1359             }
1360         }
1361
1362         $blocktitles[$block->name] = $blocktitle;
1363     }
1364
1365     if(!empty($notices)) {
1366         upgrade_log_start();
1367         foreach($notices as $notice) {
1368             notify($notice);
1369         }
1370     }
1371
1372     // Finally, if we are in the first_install of BLOCKS (this means that we are
1373     // upgrading from Moodle < 1.3), put blocks in all existing courses.
1374     if ($first_install) {
1375         upgrade_log_start();
1376         //Iterate over each course
1377         if ($courses = get_records('course')) {
1378             foreach ($courses as $course) {
1379                 $page = page_create_object(PAGE_COURSE_VIEW, $course->id);
1380                 blocks_repopulate_page($page);
1381             }
1382         }
1383     }
1384
1385     if (!empty($CFG->siteblocksadded)) {     /// This is a once-off hack to make a proper upgrade
1386         upgrade_log_start();
1387         $page = page_create_object(PAGE_COURSE_VIEW, SITEID);
1388         blocks_repopulate_page($page);
1389         delete_records('config', 'name', 'siteblocksadded');
1390     }
1391
1392     upgrade_log_finish();
1393
1394     if (!empty($updated_blocks)) {
1395         print_continue($continueto);
1396         print_footer('none');
1397         die;
1398     }
1399 }
1400
1401 ?>