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 contains the class definition for the exporter object. 19 * 20 * @package core_portfolio 21 * @copyright 2008 Penny Leach <penny@catalyst.net.nz> 22 * Martin Dougiamas <http://dougiamas.com> 23 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 24 */ 25 26defined('MOODLE_INTERNAL') || die(); 27 28/** 29 * The class that handles the various stages of the actual export 30 * and the communication between the caller and the portfolio plugin. 31 * 32 * This is stored in the database between page requests in serialized base64 encoded form 33 * also contains helper methods for the plugin and caller to use (at the end of the file) 34 * @see get_base_filearea - where to write files to 35 * @see write_new_file - write some content to a file in the export filearea 36 * @see copy_existing_file - copy an existing file into the export filearea 37 * @see get_tempfiles - return list of all files in the export filearea 38 * 39 * @package core_portfolio 40 * @category portfolio 41 * @copyright 2008 Penny Leach <penny@catalyst.net.nz> 42 * Martin Dougiamas <http://dougiamas.com> 43 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 44 */ 45class portfolio_exporter { 46 47 /** @var portfolio_caller_base the caller object used during the export */ 48 private $caller; 49 50 /** @var portfolio_plugin_base the portfolio plugin instanced used during the export */ 51 private $instance; 52 53 /** @var bool if there has been no config form displayed to the user */ 54 private $noexportconfig; 55 56 /** 57 * @var stdClass the user currently exporting content always $USER, 58 * but more conveniently placed here 59 */ 60 private $user; 61 62 /** 63 * @var string the file to include that contains the class defintion of 64 * the portfolio instance plugin used to re-waken the object after sleep 65 */ 66 public $instancefile; 67 68 /** 69 * @var string the component that contains the class definition of 70 * the caller object used to re-waken the object after sleep 71 */ 72 public $callercomponent; 73 74 /** @var int the current stage of the export */ 75 private $stage; 76 77 /** @var bool whether something (usually the portfolio plugin) has forced queuing */ 78 private $forcequeue; 79 80 /** 81 * @var int id of this export matches record in portfolio_tempdata table 82 * and used for itemid for file storage. 83 */ 84 private $id; 85 86 /** @var array of stages that have had the portfolio plugin already steal control from them */ 87 private $alreadystolen; 88 89 /** 90 * @var stored_file files that the exporter has written to this temp area keep track of 91 * this in case of duplicates within one export see MDL-16390 92 */ 93 private $newfilehashes; 94 95 /** 96 * @var string selected exportformat this is also set in 97 * export_config in the portfolio and caller classes 98 */ 99 private $format; 100 101 /** @var bool queued - this is set after the event is triggered */ 102 private $queued = false; 103 104 /** @var int expiry time - set the first time the object is saved out */ 105 private $expirytime; 106 107 /** 108 * @var bool deleted - this is set during the cleanup routine so 109 * that subsequent save() calls can detect it 110 */ 111 private $deleted = false; 112 113 /** 114 * Construct a new exporter for use 115 * 116 * @param portfolio_plugin_base $instance portfolio instance (passed by reference) 117 * @param portfolio_caller_base $caller portfolio caller (passed by reference) 118 * @param string $callercomponent the name of the callercomponent 119 */ 120 public function __construct($instance, portfolio_caller_base $caller, $callercomponent) { 121 $this->instance = $instance; 122 $this->caller = $caller; 123 if ($instance) { 124 $this->instancefile = 'portfolio/' . $instance->get('plugin') . '/lib.php'; 125 $this->instance->set('exporter', $this); 126 } 127 $this->callercomponent = $callercomponent; 128 $this->stage = PORTFOLIO_STAGE_CONFIG; 129 $this->caller->set('exporter', $this); 130 $this->alreadystolen = array(); 131 $this->newfilehashes = array(); 132 } 133 134 /** 135 * Generic getter for properties belonging to this instance 136 * <b>outside</b> the subclasses like name, visible etc. 137 * 138 * @param string $field property's name 139 * @return portfolio_format|mixed 140 */ 141 public function get($field) { 142 if ($field == 'format') { 143 return portfolio_format_object($this->format); 144 } else if ($field == 'formatclass') { 145 return $this->format; 146 } 147 if (property_exists($this, $field)) { 148 return $this->{$field}; 149 } 150 $a = (object)array('property' => $field, 'class' => get_class($this)); 151 throw new portfolio_export_exception($this, 'invalidproperty', 'portfolio', null, $a); 152 } 153 154 /** 155 * Generic setter for properties belonging to this instance 156 * <b>outside</b> the subclass like name, visible, etc. 157 * 158 * @param string $field property's name 159 * @param mixed $value property's value 160 * @return bool 161 * @throws portfolio_export_exception 162 */ 163 public function set($field, &$value) { 164 if (property_exists($this, $field)) { 165 $this->{$field} =& $value; 166 if ($field == 'instance') { 167 $this->instancefile = 'portfolio/' . $this->instance->get('plugin') . '/lib.php'; 168 $this->instance->set('exporter', $this); 169 } 170 $this->dirty = true; 171 return true; 172 } 173 $a = (object)array('property' => $field, 'class' => get_class($this)); 174 throw new portfolio_export_exception($this, 'invalidproperty', 'portfolio', null, $a); 175 176 } 177 178 /** 179 * Sets this export to force queued. 180 * Sometimes plugins need to set this randomly 181 * if an external system changes its mind 182 * about what's supported 183 */ 184 public function set_forcequeue() { 185 $this->forcequeue = true; 186 } 187 188 /** 189 * Process the given stage calling whatever functions are necessary 190 * 191 * @param int $stage (see PORTFOLIO_STAGE_* constants) 192 * @param bool $alreadystolen used to avoid letting plugins steal control twice. 193 * @return bool whether or not to process the next stage. this is important as the function is called recursively. 194 */ 195 public function process_stage($stage, $alreadystolen=false) { 196 $this->set('stage', $stage); 197 if ($alreadystolen) { 198 $this->alreadystolen[$stage] = true; 199 } else { 200 if (!array_key_exists($stage, $this->alreadystolen)) { 201 $this->alreadystolen[$stage] = false; 202 } 203 } 204 if (!$this->alreadystolen[$stage] && $url = $this->instance->steal_control($stage)) { 205 $this->save(); 206 redirect($url); // does not return 207 } else { 208 $this->save(); 209 } 210 211 $waiting = $this->instance->get_export_config('wait'); 212 if ($stage > PORTFOLIO_STAGE_QUEUEORWAIT && empty($waiting)) { 213 $stage = PORTFOLIO_STAGE_FINISHED; 214 } 215 $functionmap = array( 216 PORTFOLIO_STAGE_CONFIG => 'config', 217 PORTFOLIO_STAGE_CONFIRM => 'confirm', 218 PORTFOLIO_STAGE_QUEUEORWAIT => 'queueorwait', 219 PORTFOLIO_STAGE_PACKAGE => 'package', 220 PORTFOLIO_STAGE_CLEANUP => 'cleanup', 221 PORTFOLIO_STAGE_SEND => 'send', 222 PORTFOLIO_STAGE_FINISHED => 'finished' 223 ); 224 225 $function = 'process_stage_' . $functionmap[$stage]; 226 try { 227 if ($this->$function()) { 228 // if we get through here it means control was returned 229 // as opposed to wanting to stop processing 230 // eg to wait for user input. 231 $this->save(); 232 $stage++; 233 return $this->process_stage($stage); 234 } else { 235 $this->save(); 236 return false; 237 } 238 } catch (portfolio_caller_exception $e) { 239 portfolio_export_rethrow_exception($this, $e); 240 } catch (portfolio_plugin_exception $e) { 241 portfolio_export_rethrow_exception($this, $e); 242 } catch (portfolio_export_exception $e) { 243 throw $e; 244 } catch (Exception $e) { 245 debugging(get_string('thirdpartyexception', 'portfolio', get_class($e))); 246 debugging($e); 247 portfolio_export_rethrow_exception($this, $e); 248 } 249 } 250 251 /** 252 * Helper function to return the portfolio instance 253 * 254 * @return portfolio_plugin_base subclass 255 */ 256 public function instance() { 257 return $this->instance; 258 } 259 260 /** 261 * Helper function to return the caller object 262 * 263 * @return portfolio_caller_base subclass 264 */ 265 public function caller() { 266 return $this->caller; 267 } 268 269 /** 270 * Processes the 'config' stage of the export 271 * 272 * @return bool whether or not to process the next stage. this is important as the control function is called recursively. 273 */ 274 public function process_stage_config() { 275 global $OUTPUT, $CFG; 276 $pluginobj = $callerobj = null; 277 if ($this->instance->has_export_config()) { 278 $pluginobj = $this->instance; 279 } 280 if ($this->caller->has_export_config()) { 281 $callerobj = $this->caller; 282 } 283 $formats = portfolio_supported_formats_intersect($this->caller->supported_formats(), $this->instance->supported_formats()); 284 $expectedtime = $this->instance->expected_time($this->caller->expected_time()); 285 if (count($formats) == 0) { 286 // something went wrong, we should not have gotten this far. 287 throw new portfolio_export_exception($this, 'nocommonformats', 'portfolio', null, array('location' => get_class($this->caller), 'formats' => implode(',', $formats))); 288 } 289 // even if neither plugin or caller wants any config, we have to let the user choose their format, and decide to wait. 290 if ($pluginobj || $callerobj || count($formats) > 1 || ($expectedtime != PORTFOLIO_TIME_LOW && $expectedtime != PORTFOLIO_TIME_FORCEQUEUE)) { 291 $customdata = array( 292 'instance' => $this->instance, 293 'id' => $this->id, 294 'plugin' => $pluginobj, 295 'caller' => $callerobj, 296 'userid' => $this->user->id, 297 'formats' => $formats, 298 'expectedtime' => $expectedtime, 299 ); 300 require_once($CFG->libdir . '/portfolio/forms.php'); 301 $mform = new portfolio_export_form('', $customdata); 302 if ($mform->is_cancelled()){ 303 $this->cancel_request(); 304 } else if ($fromform = $mform->get_data()){ 305 if (!confirm_sesskey()) { 306 throw new portfolio_export_exception($this, 'confirmsesskeybad'); 307 } 308 $pluginbits = array(); 309 $callerbits = array(); 310 foreach ($fromform as $key => $value) { 311 if (strpos($key, 'plugin_') === 0) { 312 $pluginbits[substr($key, 7)] = $value; 313 } else if (strpos($key, 'caller_') === 0) { 314 $callerbits[substr($key, 7)] = $value; 315 } 316 } 317 $callerbits['format'] = $pluginbits['format'] = $fromform->format; 318 $pluginbits['wait'] = $fromform->wait; 319 if ($expectedtime == PORTFOLIO_TIME_LOW) { 320 $pluginbits['wait'] = 1; 321 $pluginbits['hidewait'] = 1; 322 } else if ($expectedtime == PORTFOLIO_TIME_FORCEQUEUE) { 323 $pluginbits['wait'] = 0; 324 $pluginbits['hidewait'] = 1; 325 $this->forcequeue = true; 326 } 327 $callerbits['hideformat'] = $pluginbits['hideformat'] = (count($formats) == 1); 328 $this->caller->set_export_config($callerbits); 329 $this->instance->set_export_config($pluginbits); 330 $this->set('format', $fromform->format); 331 return true; 332 } else { 333 $this->print_header(get_string('configexport', 'portfolio')); 334 echo $OUTPUT->box_start(); 335 $mform->display(); 336 echo $OUTPUT->box_end(); 337 echo $OUTPUT->footer(); 338 return false; 339 } 340 } else { 341 $this->noexportconfig = true; 342 $format = array_shift($formats); 343 $config = array( 344 'hidewait' => 1, 345 'wait' => (($expectedtime == PORTFOLIO_TIME_LOW) ? 1 : 0), 346 'format' => $format, 347 'hideformat' => 1 348 ); 349 $this->set('format', $format); 350 $this->instance->set_export_config($config); 351 $this->caller->set_export_config(array('format' => $format, 'hideformat' => 1)); 352 if ($expectedtime == PORTFOLIO_TIME_FORCEQUEUE) { 353 $this->forcequeue = true; 354 } 355 return true; 356 // do not break - fall through to confirm 357 } 358 } 359 360 /** 361 * Processes the 'confirm' stage of the export 362 * 363 * @return bool whether or not to process the next stage. this is important as the control function is called recursively. 364 */ 365 public function process_stage_confirm() { 366 global $CFG, $DB, $OUTPUT; 367 368 $previous = $DB->get_records( 369 'portfolio_log', 370 array( 371 'userid' => $this->user->id, 372 'portfolio' => $this->instance->get('id'), 373 'caller_sha1' => $this->caller->get_sha1(), 374 ) 375 ); 376 if (isset($this->noexportconfig) && empty($previous)) { 377 return true; 378 } 379 $strconfirm = get_string('confirmexport', 'portfolio'); 380 $baseurl = $CFG->wwwroot . '/portfolio/add.php?sesskey=' . sesskey() . '&id=' . $this->get('id'); 381 $yesurl = $baseurl . '&stage=' . PORTFOLIO_STAGE_QUEUEORWAIT; 382 $nourl = $baseurl . '&cancel=1'; 383 $this->print_header(get_string('confirmexport', 'portfolio')); 384 echo $OUTPUT->box_start(); 385 echo $OUTPUT->heading(get_string('confirmsummary', 'portfolio'), 3); 386 $mainsummary = array(); 387 if (!$this->instance->get_export_config('hideformat')) { 388 $mainsummary[get_string('selectedformat', 'portfolio')] = get_string('format_' . $this->instance->get_export_config('format'), 'portfolio'); 389 } 390 if (!$this->instance->get_export_config('hidewait')) { 391 $mainsummary[get_string('selectedwait', 'portfolio')] = get_string(($this->instance->get_export_config('wait') ? 'yes' : 'no')); 392 } 393 if ($previous) { 394 $previousstr = ''; 395 foreach ($previous as $row) { 396 $previousstr .= userdate($row->time); 397 if ($row->caller_class != get_class($this->caller)) { 398 if (!empty($row->caller_file)) { 399 portfolio_include_callback_file($row->caller_file); 400 } else if (!empty($row->caller_component)) { 401 portfolio_include_callback_file($row->caller_component); 402 } else { // Ok, that's weird - this should never happen. Is the apocalypse coming? 403 continue; 404 } 405 $previousstr .= ' (' . call_user_func(array($row->caller_class, 'display_name')) . ')'; 406 } 407 $previousstr .= '<br />'; 408 } 409 $mainsummary[get_string('exportedpreviously', 'portfolio')] = $previousstr; 410 } 411 if (!$csummary = $this->caller->get_export_summary()) { 412 $csummary = array(); 413 } 414 if (!$isummary = $this->instance->get_export_summary()) { 415 $isummary = array(); 416 } 417 $mainsummary = array_merge($mainsummary, $csummary, $isummary); 418 $table = new html_table(); 419 $table->attributes['class'] = 'generaltable exportsummary'; 420 $table->data = array(); 421 foreach ($mainsummary as $string => $value) { 422 $table->data[] = array($string, $value); 423 } 424 echo html_writer::table($table); 425 echo $OUTPUT->confirm($strconfirm, $yesurl, $nourl); 426 echo $OUTPUT->box_end(); 427 echo $OUTPUT->footer(); 428 return false; 429 } 430 431 /** 432 * Processes the 'queueornext' stage of the export 433 * 434 * @return bool whether or not to process the next stage. this is important as the control function is called recursively. 435 */ 436 public function process_stage_queueorwait() { 437 global $DB; 438 439 $wait = $this->instance->get_export_config('wait'); 440 if (empty($wait)) { 441 $DB->set_field('portfolio_tempdata', 'queued', 1, array('id' => $this->id)); 442 $this->queued = true; 443 return $this->process_stage_finished(true); 444 } 445 return true; 446 } 447 448 /** 449 * Processes the 'package' stage of the export 450 * 451 * @return bool whether or not to process the next stage. this is important as the control function is called recursively. 452 * @throws portfolio_export_exception 453 */ 454 public function process_stage_package() { 455 // now we've agreed on a format, 456 // the caller is given control to package it up however it wants 457 // and then the portfolio plugin is given control to do whatever it wants. 458 try { 459 $this->caller->prepare_package(); 460 } catch (portfolio_exception $e) { 461 throw new portfolio_export_exception($this, 'callercouldnotpackage', 'portfolio', null, $e->getMessage()); 462 } 463 catch (file_exception $e) { 464 throw new portfolio_export_exception($this, 'callercouldnotpackage', 'portfolio', null, $e->getMessage()); 465 } 466 try { 467 $this->instance->prepare_package(); 468 } 469 catch (portfolio_exception $e) { 470 throw new portfolio_export_exception($this, 'plugincouldnotpackage', 'portfolio', null, $e->getMessage()); 471 } 472 catch (file_exception $e) { 473 throw new portfolio_export_exception($this, 'plugincouldnotpackage', 'portfolio', null, $e->getMessage()); 474 } 475 return true; 476 } 477 478 /** 479 * Processes the 'cleanup' stage of the export 480 * 481 * @param bool $pullok normally cleanup is deferred for pull plugins until after the file is requested from portfolio/file.php 482 * if you want to clean up earlier, pass true here (defaults to false) 483 * @return bool whether or not to process the next stage. this is important as the control function is called recursively. 484 */ 485 public function process_stage_cleanup($pullok=false) { 486 global $CFG, $DB; 487 488 if (!$pullok && $this->get('instance') && !$this->get('instance')->is_push()) { 489 return true; 490 } 491 if ($this->get('instance')) { 492 // might not be set - before export really starts 493 $this->get('instance')->cleanup(); 494 } 495 $DB->delete_records('portfolio_tempdata', array('id' => $this->id)); 496 $fs = get_file_storage(); 497 $fs->delete_area_files(SYSCONTEXTID, 'portfolio', 'exporter', $this->id); 498 $this->deleted = true; 499 return true; 500 } 501 502 /** 503 * Processes the 'send' stage of the export 504 * 505 * @return bool whether or not to process the next stage. this is important as the control function is called recursively. 506 */ 507 public function process_stage_send() { 508 // send the file 509 try { 510 $this->instance->send_package(); 511 } 512 catch (portfolio_plugin_exception $e) { 513 // not catching anything more general here. plugins with dependencies on other libraries that throw exceptions should catch and rethrow. 514 // eg curl exception 515 throw new portfolio_export_exception($this, 'failedtosendpackage', 'portfolio', null, $e->getMessage()); 516 } 517 // only log push types, pull happens in send_file 518 if ($this->get('instance')->is_push()) { 519 $this->log_transfer(); 520 } 521 return true; 522 } 523 524 /** 525 * Log the transfer 526 * 527 * this should only be called after the file has been sent 528 * either via push, or sent from a pull request. 529 */ 530 public function log_transfer() { 531 global $DB; 532 $l = array( 533 'userid' => $this->user->id, 534 'portfolio' => $this->instance->get('id'), 535 'caller_file'=> '', 536 'caller_component' => $this->callercomponent, 537 'caller_sha1' => $this->caller->get_sha1(), 538 'caller_class' => get_class($this->caller), 539 'continueurl' => $this->instance->get_static_continue_url(), 540 'returnurl' => $this->caller->get_return_url(), 541 'tempdataid' => $this->id, 542 'time' => time(), 543 ); 544 $DB->insert_record('portfolio_log', $l); 545 } 546 547 /** 548 * In some cases (mahara) we need to update this after the log has been done 549 * because of MDL-20872 550 * 551 * @param string $url link to be recorded to portfolio log 552 */ 553 public function update_log_url($url) { 554 global $DB; 555 $DB->set_field('portfolio_log', 'continueurl', $url, array('tempdataid' => $this->id)); 556 } 557 558 /** 559 * Processes the 'finish' stage of the export 560 * 561 * @param bool $queued let the process to be queued 562 * @return bool whether or not to process the next stage. this is important as the control function is called recursively. 563 */ 564 public function process_stage_finished($queued=false) { 565 global $OUTPUT; 566 $returnurl = $this->caller->get_return_url(); 567 $continueurl = $this->instance->get_interactive_continue_url(); 568 $extras = $this->instance->get_extra_finish_options(); 569 570 $key = 'exportcomplete'; 571 if ($queued || $this->forcequeue) { 572 $key = 'exportqueued'; 573 if ($this->forcequeue) { 574 $key = 'exportqueuedforced'; 575 } 576 } 577 $this->print_header(get_string($key, 'portfolio'), false); 578 self::print_finish_info($returnurl, $continueurl, $extras); 579 echo $OUTPUT->footer(); 580 return false; 581 } 582 583 584 /** 585 * Local print header function to be reused across the export 586 * 587 * @param string $headingstr full language string 588 * @param bool $summary (optional) to print summary, default is set to true 589 * @return void 590 */ 591 public function print_header($headingstr, $summary=true) { 592 global $OUTPUT, $PAGE; 593 $titlestr = get_string('exporting', 'portfolio'); 594 $headerstr = get_string('exporting', 'portfolio'); 595 596 $PAGE->set_title($titlestr); 597 $PAGE->set_heading($headerstr); 598 echo $OUTPUT->header(); 599 echo $OUTPUT->heading($headingstr); 600 601 if (!$summary) { 602 return; 603 } 604 605 echo $OUTPUT->box_start(); 606 echo $OUTPUT->box_start(); 607 echo $this->caller->heading_summary(); 608 echo $OUTPUT->box_end(); 609 if ($this->instance) { 610 echo $OUTPUT->box_start(); 611 echo $this->instance->heading_summary(); 612 echo $OUTPUT->box_end(); 613 } 614 echo $OUTPUT->box_end(); 615 } 616 617 /** 618 * Cancels a potfolio request and cleans up the tempdata 619 * and redirects the user back to where they started 620 * 621 * @param bool $logreturn options to return to porfolio log or caller return page 622 * @return void 623 * @uses exit 624 */ 625 public function cancel_request($logreturn=false) { 626 global $CFG; 627 if (!isset($this)) { 628 return; 629 } 630 $this->process_stage_cleanup(true); 631 if ($logreturn) { 632 redirect($CFG->wwwroot . '/user/portfoliologs.php'); 633 } 634 redirect($this->caller->get_return_url()); 635 exit; 636 } 637 638 /** 639 * Writes out the contents of this object and all its data to the portfolio_tempdata table and sets the 'id' field. 640 * 641 * @return void 642 */ 643 public function save() { 644 global $DB; 645 if (empty($this->id)) { 646 $r = (object)array( 647 'data' => base64_encode(serialize($this)), 648 'expirytime' => time() + (60*60*24), 649 'userid' => $this->user->id, 650 'instance' => (empty($this->instance)) ? null : $this->instance->get('id'), 651 ); 652 $this->id = $DB->insert_record('portfolio_tempdata', $r); 653 $this->expirytime = $r->expirytime; 654 $this->save(); // call again so that id gets added to the save data. 655 } else { 656 if (!$r = $DB->get_record('portfolio_tempdata', array('id' => $this->id))) { 657 if (!$this->deleted) { 658 //debugging("tried to save current object, but failed - see MDL-20872"); 659 } 660 return; 661 } 662 $r->data = base64_encode(serialize($this)); 663 $r->instance = (empty($this->instance)) ? null : $this->instance->get('id'); 664 $DB->update_record('portfolio_tempdata', $r); 665 } 666 } 667 668 /** 669 * Rewakens the data from the database given the id. 670 * Makes sure to load the required files with the class definitions 671 * 672 * @param int $id id of data 673 * @return portfolio_exporter 674 */ 675 public static function rewaken_object($id) { 676 global $DB, $CFG; 677 require_once($CFG->libdir . '/filelib.php'); 678 require_once($CFG->libdir . '/portfolio/exporter.php'); 679 require_once($CFG->libdir . '/portfolio/caller.php'); 680 require_once($CFG->libdir . '/portfolio/plugin.php'); 681 if (!$data = $DB->get_record('portfolio_tempdata', array('id' => $id))) { 682 // maybe it's been finished already by a pull plugin 683 // so look in the logs 684 if ($log = $DB->get_record('portfolio_log', array('tempdataid' => $id))) { 685 self::print_cleaned_export($log); 686 } 687 throw new portfolio_exception('invalidtempid', 'portfolio'); 688 } 689 $exporter = unserialize(base64_decode($data->data)); 690 if ($exporter->instancefile) { 691 require_once($CFG->dirroot . '/' . $exporter->instancefile); 692 } 693 if (!empty($exporter->callerfile)) { 694 portfolio_include_callback_file($exporter->callerfile); 695 } else if (!empty($exporter->callercomponent)) { 696 portfolio_include_callback_file($exporter->callercomponent); 697 } else { 698 return; // Should never get here! 699 } 700 701 $exporter = unserialize(serialize($exporter)); 702 if (!$exporter->get('id')) { 703 // workaround for weird case 704 // where the id doesn't get saved between a new insert 705 // and the subsequent call that sets this field in the serialised data 706 $exporter->set('id', $id); 707 $exporter->save(); 708 } 709 return $exporter; 710 } 711 712 /** 713 * Helper function to create the beginnings of a file_record object 714 * to create a new file in the portfolio_temporary working directory. 715 * Use write_new_file or copy_existing_file externally 716 * @see write_new_file 717 * @see copy_existing_file 718 * 719 * @param string $name filename of new record 720 * @return object 721 */ 722 private function new_file_record_base($name) { 723 return (object)array_merge($this->get_base_filearea(), array( 724 'filepath' => '/', 725 'filename' => $name, 726 )); 727 } 728 729 /** 730 * Verifies a rewoken object. 731 * Checks to make sure it belongs to the same user and session as is currently in use. 732 * 733 * @param bool $readonly if we're reawakening this for a user to just display in the log view, don't verify the sessionkey 734 * @throws portfolio_exception 735 */ 736 public function verify_rewaken($readonly=false) { 737 global $USER, $CFG; 738 if ($this->get('user')->id != $USER->id) { // make sure it belongs to the right user 739 throw new portfolio_exception('notyours', 'portfolio'); 740 } 741 if (!$readonly && $this->get('instance') && !$this->get('instance')->allows_multiple_exports()) { 742 $already = portfolio_existing_exports($this->get('user')->id, $this->get('instance')->get('plugin')); 743 $already = array_keys($already); 744 745 if (array_shift($already) != $this->get('id')) { 746 747 $a = (object)array( 748 'plugin' => $this->get('instance')->get('plugin'), 749 'link' => $CFG->wwwroot . '/user/portfoliologs.php', 750 ); 751 throw new portfolio_exception('nomultipleexports', 'portfolio', '', $a); 752 } 753 } 754 if (!$this->caller->check_permissions()) { // recall the caller permission check 755 throw new portfolio_caller_exception('nopermissions', 'portfolio', $this->caller->get_return_url()); 756 } 757 } 758 /** 759 * Copies a file from somewhere else in moodle 760 * to the portfolio temporary working directory 761 * associated with this export 762 * 763 * @param stored_file $oldfile existing stored file object 764 * @return stored_file|bool new file object 765 */ 766 public function copy_existing_file($oldfile) { 767 if (array_key_exists($oldfile->get_contenthash(), $this->newfilehashes)) { 768 return $this->newfilehashes[$oldfile->get_contenthash()]; 769 } 770 $fs = get_file_storage(); 771 $file_record = $this->new_file_record_base($oldfile->get_filename()); 772 if ($dir = $this->get('format')->get_file_directory()) { 773 $file_record->filepath = '/'. $dir . '/'; 774 } 775 try { 776 $newfile = $fs->create_file_from_storedfile($file_record, $oldfile->get_id()); 777 $this->newfilehashes[$newfile->get_contenthash()] = $newfile; 778 return $newfile; 779 } catch (file_exception $e) { 780 return false; 781 } 782 } 783 784 /** 785 * Writes out some content to a file 786 * in the portfolio temporary working directory 787 * associated with this export. 788 * 789 * @param string $content content to write 790 * @param string $name filename to use 791 * @param bool $manifest whether this is the main file or an secondary file (eg attachment) 792 * @return stored_file 793 */ 794 public function write_new_file($content, $name, $manifest=true) { 795 $fs = get_file_storage(); 796 $file_record = $this->new_file_record_base($name); 797 if (empty($manifest) && ($dir = $this->get('format')->get_file_directory())) { 798 $file_record->filepath = '/' . $dir . '/'; 799 } 800 return $fs->create_file_from_string($file_record, $content); 801 } 802 803 /** 804 * Zips all files in the temporary directory 805 * 806 * @param string $filename name of resulting zipfile (optional, defaults to portfolio-export.zip) 807 * @param string $filepath subpath in the filearea (optional, defaults to final) 808 * @return stored_file|bool resulting stored_file object, or false 809 */ 810 public function zip_tempfiles($filename='portfolio-export.zip', $filepath='/final/') { 811 $zipper = new zip_packer(); 812 813 list ($contextid, $component, $filearea, $itemid) = array_values($this->get_base_filearea()); 814 if ($newfile = $zipper->archive_to_storage($this->get_tempfiles(), $contextid, $component, $filearea, $itemid, $filepath, $filename, $this->user->id)) { 815 return $newfile; 816 } 817 return false; 818 819 } 820 821 /** 822 * Returns an arary of files in the temporary working directory 823 * for this export. 824 * Always use this instead of the files api directly 825 * 826 * @param string $skipfile name of the file to be skipped 827 * @return array of stored_file objects keyed by name 828 */ 829 public function get_tempfiles($skipfile='portfolio-export.zip') { 830 $fs = get_file_storage(); 831 $files = $fs->get_area_files(SYSCONTEXTID, 'portfolio', 'exporter', $this->id, 'sortorder, itemid, filepath, filename', false); 832 if (empty($files)) { 833 return array(); 834 } 835 $returnfiles = array(); 836 foreach ($files as $f) { 837 if ($f->get_filename() == $skipfile) { 838 continue; 839 } 840 $returnfiles[$f->get_filepath() . $f->get_filename()] = $f; 841 } 842 return $returnfiles; 843 } 844 845 /** 846 * Returns the context, filearea, and itemid. 847 * Parts of a filearea (not filepath) to be used by 848 * plugins if they want to do things like zip up the contents of 849 * the temp area to here, or something that can't be done just using 850 * write_new_file, copy_existing_file or get_tempfiles 851 * 852 * @return array contextid, filearea, itemid are the keys. 853 */ 854 public function get_base_filearea() { 855 return array( 856 'contextid' => SYSCONTEXTID, 857 'component' => 'portfolio', 858 'filearea' => 'exporter', 859 'itemid' => $this->id, 860 ); 861 } 862 863 /** 864 * Wrapper function to print a friendly error to users 865 * This is generally caused by them hitting an expired transfer 866 * through the usage of the backbutton 867 * 868 * @uses exit 869 */ 870 public static function print_expired_export() { 871 global $CFG, $OUTPUT, $PAGE; 872 $title = get_string('exportexpired', 'portfolio'); 873 $PAGE->navbar->add(get_string('exportexpired', 'portfolio')); 874 $PAGE->set_title($title); 875 $PAGE->set_heading($title); 876 echo $OUTPUT->header(); 877 echo $OUTPUT->notification(get_string('exportexpireddesc', 'portfolio')); 878 echo $OUTPUT->continue_button($CFG->wwwroot); 879 echo $OUTPUT->footer(); 880 exit; 881 } 882 883 /** 884 * Wrapper function to print a friendly error to users 885 * 886 * @param stdClass $log portfolio_log object 887 * @param portfolio_plugin_base $instance portfolio instance 888 * @uses exit 889 */ 890 public static function print_cleaned_export($log, $instance=null) { 891 global $CFG, $OUTPUT, $PAGE; 892 if (empty($instance) || !$instance instanceof portfolio_plugin_base) { 893 $instance = portfolio_instance($log->portfolio); 894 } 895 $title = get_string('exportalreadyfinished', 'portfolio'); 896 $PAGE->navbar->add($title); 897 $PAGE->set_title($title); 898 $PAGE->set_heading($title); 899 echo $OUTPUT->header(); 900 echo $OUTPUT->notification(get_string('exportalreadyfinished', 'portfolio')); 901 self::print_finish_info($log->returnurl, $instance->resolve_static_continue_url($log->continueurl)); 902 echo $OUTPUT->continue_button($CFG->wwwroot); 903 echo $OUTPUT->footer(); 904 exit; 905 } 906 907 /** 908 * Wrapper function to print continue and/or return link 909 * 910 * @param string $returnurl link to previos page 911 * @param string $continueurl continue to next page 912 * @param array $extras (optional) other links to be display. 913 */ 914 public static function print_finish_info($returnurl, $continueurl, $extras=null) { 915 if ($returnurl) { 916 echo '<a href="' . $returnurl . '">' . get_string('returntowhereyouwere', 'portfolio') . '</a><br />'; 917 } 918 if ($continueurl) { 919 echo '<a href="' . $continueurl . '">' . get_string('continuetoportfolio', 'portfolio') . '</a><br />'; 920 } 921 if (is_array($extras)) { 922 foreach ($extras as $link => $string) { 923 echo '<a href="' . $link . '">' . $string . '</a><br />'; 924 } 925 } 926 } 927} 928