[Summary view]

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

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * External grading API
  19   *
  20   * @package    core_grading
  21   * @since      Moodle 2.5
  22   * @copyright  2013 Paul Charsley
  23   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24   */
  25  
  26  defined('MOODLE_INTERNAL') || die;
  27  
  28  require_once("$CFG->libdir/externallib.php");
  29  require_once("$CFG->dirroot/grade/grading/lib.php");
  30  
  31  /**
  32   * core grading functions
  33   */
  34  class core_grading_external extends external_api {
  35  
  36      /**
  37       * Describes the parameters for get_definitions
  38       * @return external_function_parameters
  39       * @since Moodle 2.5
  40       */
  41      public static function get_definitions_parameters() {
  42          return new external_function_parameters(
  43              array(
  44                  'cmids' => new external_multiple_structure(
  45                          new external_value(PARAM_INT, 'course module id'), '1 or more course module ids'),
  46                  'areaname' => new external_value(PARAM_AREA, 'area name'),
  47                  'activeonly' => new external_value(PARAM_BOOL, 'Only the active method', VALUE_DEFAULT, 0)
  48              )
  49          );
  50      }
  51  
  52      /**
  53       * Returns the definitions for the requested course module ids
  54       * @param array of ints $cmids
  55       * @param string $areaname
  56       * @param boolean $activeonly default is false, if true, only the active method is returned
  57       * @return array of areas with definitions for each requested course module id
  58       * @since Moodle 2.5
  59       */
  60      public static function get_definitions($cmids, $areaname, $activeonly = false) {
  61          global $DB, $CFG;
  62          require_once("$CFG->dirroot/grade/grading/form/lib.php");
  63          $params = self::validate_parameters(self::get_definitions_parameters(),
  64              array('cmids' => $cmids,
  65                  'areaname' => $areaname,
  66                  'activeonly' => $activeonly));
  67          $warnings = array();
  68          $areas = array();
  69          foreach ($params['cmids'] as $cmid) {
  70              $context = context_module::instance($cmid);
  71              try {
  72                  self::validate_context($context);
  73              } catch (Exception $e) {
  74                  $warnings[] = array(
  75                      'item' => 'module',
  76                      'itemid' => $cmid,
  77                      'message' => 'No access rights in module context',
  78                      'warningcode' => '1'
  79                  );
  80                  continue;
  81              }
  82              // Check if the user has managegradingforms capability.
  83              $isgradingmethodmanager = false;
  84              if (has_capability('moodle/grade:managegradingforms', $context)) {
  85                  $isgradingmethodmanager = true;
  86              }
  87              $module = get_coursemodule_from_id('', $cmid, 0, false, MUST_EXIST);
  88              $componentname = "mod_".$module->modname;
  89  
  90              // Get the grading manager.
  91              $gradingmanager = get_grading_manager($context, $componentname, $params['areaname']);
  92              // Get the controller for each grading method.
  93              $methods = array();
  94              if ($params['activeonly'] == true) {
  95                  $methods[] = $gradingmanager->get_active_method();
  96              } else {
  97                  $methods = array_keys($gradingmanager->get_available_methods(false));
  98              }
  99  
 100              $area = array();
 101              $area['cmid'] = $cmid;
 102              $area['contextid'] = $context->id;
 103              $area['component'] = $componentname;
 104              $area['areaname'] = $params['areaname'];
 105              $area['activemethod'] = $gradingmanager->get_active_method();
 106              $area['definitions'] = array();
 107  
 108              foreach ($methods as $method) {
 109                  $controller = $gradingmanager->get_controller($method);
 110                  $def = $controller->get_definition(true);
 111                  if ($def == false) {
 112                      continue;
 113                  }
 114                  if ($isgradingmethodmanager == false) {
 115                      $isviewable = true;
 116                      if ($def->status != gradingform_controller::DEFINITION_STATUS_READY) {
 117                          $warnings[] = array(
 118                              'item' => 'module',
 119                              'itemid' => $cmid,
 120                              'message' => 'Capability moodle/grade:managegradingforms required to view draft definitions',
 121                              'warningcode' => '1'
 122                          );
 123                          $isviewable = false;
 124                      }
 125                      if (!empty($def->options)) {
 126                          $options = json_decode($def->options);
 127                          if (isset($options->alwaysshowdefinition) &&
 128                              $options->alwaysshowdefinition == 0) {
 129                              $warnings[] = array(
 130                                  'item' => 'module',
 131                                  'itemid' => $cmid,
 132                                  'message' => 'Capability moodle/grade:managegradingforms required to preview definition',
 133                                  'warningcode' => '1'
 134                              );
 135                              $isviewable = false;
 136                          }
 137                      }
 138                      if ($isviewable == false) {
 139                          continue;
 140                      }
 141                  }
 142                  $definition = array();
 143                  $definition['id'] = $def->id;
 144                  $definition['method'] = $method;
 145                  $definition['name'] = $def->name;
 146                  $definition['description'] = $def->description;
 147                  $definition['descriptionformat'] = $def->descriptionformat;
 148                  $definition['status'] = $def->status;
 149                  $definition['copiedfromid'] = $def->copiedfromid;
 150                  $definition['timecreated'] = $def->timecreated;
 151                  $definition['usercreated'] = $def->usercreated;
 152                  $definition['timemodified'] = $def->timemodified;
 153                  $definition['usermodified'] = $def->usermodified;
 154                  $definition['timecopied'] = $def->timecopied;
 155                  // Format the description text field.
 156                  $formattedtext = external_format_text($definition['description'],
 157                      $definition['descriptionformat'],
 158                      $context->id,
 159                      $componentname,
 160                      'description',
 161                      $def->id);
 162                  $definition['description'] = $formattedtext[0];
 163                  $definition['descriptionformat'] = $formattedtext[1];
 164  
 165                  $details = $controller->get_external_definition_details();
 166                  $items = array();
 167                  foreach ($details as $key => $value) {
 168                      $items[$key] = self::format_text($def->{$key}, $context->id, $componentname, $def->id);
 169                  }
 170                  $definition[$method] = $items;
 171                  $area['definitions'][] = $definition;
 172              }
 173              $areas[] = $area;
 174          }
 175          $result = array(
 176              'areas' => $areas,
 177              'warnings' => $warnings
 178          );
 179          return $result;
 180      }
 181  
 182      /**
 183       * Recursively processes all elements in an array and runs external_format_text()on
 184       * all elements which have a text field and associated format field with a key name
 185       * that ends with the text 'format'. The modified array is returned.
 186       * @param array $items the array to be processed
 187       * @param int $contextid
 188       * @param string $componentname
 189       * @param int $itemid
 190       * @see external_format_text in lib/externallib.php
 191       * @return array the input array with all fields formatted
 192       */
 193      private static function format_text($items, $contextid, $componentname, $itemid) {
 194          $formatkeys = array();
 195          foreach ($items as $key => $value) {
 196              if (!is_array($value) && substr_compare($key, 'format', -6, 6) === 0) {
 197                  $formatkeys[] = $key;
 198              }
 199          }
 200          foreach ($formatkeys as $formatkey) {
 201              $descriptionkey = substr($formatkey, 0, -6);
 202              $formattedtext = external_format_text($items[$descriptionkey],
 203                  $items[$formatkey],
 204                  $contextid,
 205                  $componentname,
 206                  'description',
 207                  $itemid);
 208              $items[$descriptionkey] = $formattedtext[0];
 209              $items[$formatkey] = $formattedtext[1];
 210          }
 211          foreach ($items as $key => $value) {
 212              if (is_array($value)) {
 213                  $items[$key] = self::format_text($value, $contextid, $componentname, $itemid);
 214              }
 215          }
 216          return $items;
 217      }
 218  
 219      /**
 220       * Creates a grading area
 221       * @return external_single_structure
 222       * @since  Moodle 2.5
 223       */
 224      private static function grading_area() {
 225          return new external_single_structure(
 226              array (
 227                  'cmid'    => new external_value(PARAM_INT, 'course module id'),
 228                  'contextid'  => new external_value(PARAM_INT, 'context id'),
 229                  'component' => new external_value(PARAM_TEXT, 'component name'),
 230                  'areaname' => new external_value(PARAM_TEXT, 'area name'),
 231                  'activemethod' => new external_value(PARAM_TEXT, 'active method', VALUE_OPTIONAL),
 232                  'definitions'  => new external_multiple_structure(self::definition(), 'definitions')
 233              )
 234          );
 235      }
 236  
 237      /**
 238       * creates a grading form definition
 239       * @return external_single_structure
 240       * @since  Moodle 2.5
 241       */
 242      private static function definition() {
 243          global $CFG;
 244          $definition = array();
 245          $definition['id']                = new external_value(PARAM_INT, 'definition id', VALUE_OPTIONAL);
 246          $definition['method']            = new external_value(PARAM_TEXT, 'method');
 247          $definition['name']              = new external_value(PARAM_TEXT, 'name');
 248          $definition['description']       = new external_value(PARAM_RAW, 'description', VALUE_OPTIONAL);
 249          $definition['descriptionformat'] = new external_format_value('description', VALUE_OPTIONAL);
 250          $definition['status']            = new external_value(PARAM_INT, 'status');
 251          $definition['copiedfromid']      = new external_value(PARAM_INT, 'copied from id', VALUE_OPTIONAL);
 252          $definition['timecreated']       = new external_value(PARAM_INT, 'creation time');
 253          $definition['usercreated']       = new external_value(PARAM_INT, 'user who created definition');
 254          $definition['timemodified']      = new external_value(PARAM_INT, 'last modified time');
 255          $definition['usermodified']      = new external_value(PARAM_INT, 'user who modified definition');
 256          $definition['timecopied']        = new external_value(PARAM_INT, 'time copied', VALUE_OPTIONAL);
 257          foreach (self::get_grading_methods() as $method) {
 258              require_once($CFG->dirroot.'/grade/grading/form/'.$method.'/lib.php');
 259              $details  = call_user_func('gradingform_'.$method.'_controller::get_external_definition_details');
 260              if ($details != null) {
 261                  $items = array();
 262                  foreach ($details as $key => $value) {
 263                      $details[$key]->required = VALUE_OPTIONAL;
 264                      $items[$key] = $value;
 265                  }
 266                  $definition[$method] = new external_single_structure($items, 'items', VALUE_OPTIONAL);
 267              }
 268          }
 269          return new external_single_structure($definition);
 270      }
 271  
 272      /**
 273       * Describes the get_definitions return value
 274       * @return external_single_structure
 275       * @since Moodle 2.5
 276       */
 277      public static function get_definitions_returns() {
 278          return new external_single_structure(
 279              array(
 280                  'areas' => new external_multiple_structure(self::grading_area(), 'list of grading areas'),
 281                  'warnings' => new external_warnings()
 282              )
 283          );
 284      }
 285  
 286      /**
 287       * @return array of available grading methods
 288       * @since Moodle 2.5
 289       */
 290      private static function get_grading_methods() {
 291          $methods = array_keys(grading_manager::available_methods(false));
 292          return $methods;
 293      }
 294  
 295      /**
 296       * Describes the parameters for get_gradingform_instances
 297       *
 298       * @return external_function_parameters
 299       * @since Moodle 2.6
 300       */
 301      public static function get_gradingform_instances_parameters() {
 302          return new external_function_parameters(
 303              array(
 304                  'definitionid' => new external_value(PARAM_INT, 'definition id'),
 305                  'since' => new external_value(PARAM_INT, 'submitted since', VALUE_DEFAULT, 0)
 306              )
 307          );
 308      }
 309  
 310      /**
 311       * Returns the instances and fillings for the requested definition id
 312       *
 313       * @param int $definitionid
 314       * @param int $since only return instances with timemodified >= since
 315       * @return array of grading instances with fillings for the definition id
 316       * @since Moodle 2.6
 317       */
 318      public static function get_gradingform_instances($definitionid, $since = 0) {
 319          global $DB, $CFG;
 320          require_once("$CFG->dirroot/grade/grading/form/lib.php");
 321          $params = self::validate_parameters(self::get_gradingform_instances_parameters(),
 322              array('definitionid' => $definitionid,
 323                  'since' => $since));
 324          $instances = array();
 325          $warnings = array();
 326  
 327          $definition = $DB->get_record('grading_definitions',
 328              array('id' => $params['definitionid']),
 329              'areaid,method', MUST_EXIST);
 330          $area = $DB->get_record('grading_areas',
 331              array('id' => $definition->areaid),
 332              'contextid,component', MUST_EXIST);
 333  
 334          $context = context::instance_by_id($area->contextid);
 335          require_capability('moodle/grade:managegradingforms', $context);
 336  
 337          $gradingmanager = get_grading_manager($definition->areaid);
 338          $controller = $gradingmanager->get_controller($definition->method);
 339          $activeinstances = $controller->get_all_active_instances ($params['since']);
 340          $details = $controller->get_external_instance_filling_details();
 341          if ($details == null) {
 342              $warnings[] = array(
 343                  'item' => 'definition',
 344                  'itemid' => $params['definitionid'],
 345                  'message' => 'Fillings unavailable because get_external_instance_filling_details is not defined',
 346                  'warningcode' => '1'
 347              );
 348          }
 349          $getfilling = null;
 350          if (method_exists('gradingform_'.$definition->method.'_instance', 'get_'.$definition->method.'_filling')) {
 351              $getfilling = 'get_'.$definition->method.'_filling';
 352          } else {
 353              $warnings[] = array(
 354                  'item' => 'definition',
 355                  'itemid' => $params['definitionid'],
 356                  'message' => 'Fillings unavailable because get_'.$definition->method.'_filling is not defined',
 357                  'warningcode' => '1'
 358              );
 359          }
 360          foreach ($activeinstances as $activeinstance) {
 361              $instance = array();
 362              $instance['id'] = $activeinstance->get_id();
 363              $instance['raterid'] = $activeinstance->get_data('raterid');
 364              $instance['itemid'] = $activeinstance->get_data('itemid');
 365              $instance['rawgrade'] = $activeinstance->get_data('rawgrade');
 366              $instance['status'] = $activeinstance->get_data('status');
 367              $instance['feedback'] = $activeinstance->get_data('feedback');
 368              $instance['feedbackformat'] = $activeinstance->get_data('feedbackformat');
 369              // Format the feedback text field.
 370              $formattedtext = external_format_text($activeinstance->get_data('feedback'),
 371                  $activeinstance->get_data('feedbackformat'),
 372                  $context->id,
 373                  $area->component,
 374                  'feedback',
 375                  $params['definitionid']);
 376              $instance['feedback'] = $formattedtext[0];
 377              $instance['feedbackformat'] = $formattedtext[1];
 378              $instance['timemodified'] = $activeinstance->get_data('timemodified');
 379  
 380              if ($details != null && $getfilling != null) {
 381                  $fillingdata = $activeinstance->$getfilling();
 382                  $filling = array();
 383                  foreach ($details as $key => $value) {
 384                      $filling[$key] = self::format_text($fillingdata[$key],
 385                          $context->id,
 386                          $area->component,
 387                          $params['definitionid']);
 388                  }
 389                  $instance[$definition->method] = $filling;
 390              }
 391              $instances[] = $instance;
 392          }
 393          $result = array(
 394              'instances' => $instances,
 395              'warnings' => $warnings
 396          );
 397          return $result;
 398      }
 399  
 400      /**
 401       * Creates a grading instance
 402       *
 403       * @return external_single_structure
 404       * @since  Moodle 2.6
 405       */
 406      private static function grading_instance() {
 407          global $CFG;
 408          $instance = array();
 409          $instance['id']                = new external_value(PARAM_INT, 'instance id');
 410          $instance['raterid']           = new external_value(PARAM_INT, 'rater id');
 411          $instance['itemid']            = new external_value(PARAM_INT, 'item id');
 412          $instance['rawgrade']          = new external_value(PARAM_TEXT, 'raw grade', VALUE_OPTIONAL);
 413          $instance['status']            = new external_value(PARAM_INT, 'status');
 414          $instance['feedback']          = new external_value(PARAM_RAW, 'feedback', VALUE_OPTIONAL);
 415          $instance['feedbackformat']    = new external_format_value('feedback', VALUE_OPTIONAL);
 416          $instance['timemodified']      = new external_value(PARAM_INT, 'modified time');
 417          foreach (self::get_grading_methods() as $method) {
 418              require_once($CFG->dirroot.'/grade/grading/form/'.$method.'/lib.php');
 419              $details  = call_user_func('gradingform_'.$method.'_controller::get_external_instance_filling_details');
 420              if ($details != null) {
 421                  $items = array();
 422                  foreach ($details as $key => $value) {
 423                      $details[$key]->required = VALUE_OPTIONAL;
 424                      $items[$key] = $value;
 425                  }
 426                  $instance[$method] = new external_single_structure($items, 'items', VALUE_OPTIONAL);
 427              }
 428          }
 429          return new external_single_structure($instance);
 430      }
 431  
 432      /**
 433       * Describes the get_gradingform_instances return value
 434       *
 435       * @return external_single_structure
 436       * @since Moodle 2.6
 437       */
 438      public static function get_gradingform_instances_returns() {
 439          return new external_single_structure(
 440              array(
 441                  'instances' => new external_multiple_structure(self::grading_instance(), 'list of grading instances'),
 442                  'warnings' => new external_warnings()
 443              )
 444          );
 445      }
 446  
 447      /**
 448       * Describes the parameters for save_definitions
 449       *
 450       * @return external_function_parameters
 451       * @since Moodle 2.8
 452       */
 453      public static function save_definitions_parameters() {
 454          return new external_function_parameters(
 455              array(
 456                  'areas' => new external_multiple_structure(self::grading_area(), 'areas with definitions to save')
 457              )
 458          );
 459      }
 460  
 461      /**
 462       * Saves the areas and definitions
 463       * @param array $areas array of areas containing definitions to be saved
 464       * @return null
 465       * @throws invalid_parameter_exception
 466       * @since Moodle 2.8
 467       */
 468      public static function save_definitions($areas) {
 469          $params = self::validate_parameters(self::save_definitions_parameters(),
 470                                              array('areas' => $areas));
 471  
 472          foreach ($params['areas'] as $area) {
 473  
 474              $context = context::instance_by_id($area['contextid']);
 475              require_capability('moodle/grade:managegradingforms', $context);
 476              $gradingmanager = get_grading_manager($context, $area['component'], $area['areaname']);
 477              $gradingmanager->set_active_method($area['activemethod']);
 478              $availablemethods = $gradingmanager->get_available_methods();
 479  
 480              foreach ($area['definitions'] as $definition) {
 481                  if (array_key_exists($definition['method'], $availablemethods)) {
 482                      $controller = $gradingmanager->get_controller($definition['method']);
 483                      $controller->update_definition(self::create_definition_object($definition));
 484                  } else {
 485                      throw new invalid_parameter_exception('Unknown Grading method: '. $definition['method']);
 486                  }
 487              }
 488          }
 489      }
 490  
 491      /**
 492       * Describes the return value for save_definitions
 493       *
 494       * @return external_single_structure
 495       * @since Moodle 2.8
 496       */
 497      public static function save_definitions_returns() {
 498          return null;
 499      }
 500  
 501      /**
 502       * Creates a definition stdClass object using the values from the definition
 503       * array that is passed in as a parameter
 504       *
 505       * @param array $definition
 506       * @return stdClass definition object
 507       * @since Moodle 2.8
 508       */
 509      private static function create_definition_object($definition) {
 510          global $CFG;
 511  
 512          $method = $definition['method'];
 513          $definitionobject = new stdClass();
 514          foreach ($definition as $key => $value) {
 515              if (!is_array($value)) {
 516                  $definitionobject->$key = $value;
 517              }
 518          }
 519          $text = '';
 520          $format = FORMAT_MOODLE;
 521          if (isset($definition['description'])) {
 522              $text = $definition['description'];
 523              if (isset($definition['descriptionformat'])) {
 524                  $format = $definition['descriptionformat'];
 525              }
 526          }
 527          $definitionobject->description_editor = array('text' => $text, 'format' => $format);
 528  
 529          require_once("$CFG->libdir/filelib.php");
 530          require_once($CFG->dirroot.'/grade/grading/form/'.$method.'/lib.php');
 531          $details  = call_user_func('gradingform_'.$method.'_controller::get_external_definition_details');
 532          $methodarray = array();
 533          foreach (array_keys($details) as $definitionkey) {
 534              $items = array();
 535              $idnumber = 1;
 536              foreach ($definition[$method][$definitionkey] as $item) {
 537                  $processeditem = self::set_new_ids($item, $idnumber);
 538                  $items[$processeditem['id']] = $processeditem;
 539                  $idnumber++;
 540              }
 541              $definitionobjectkey = substr($definitionkey, strlen($method.'_'));
 542              $methodarray[$definitionobjectkey] = $items;
 543              $definitionobject->$method = $methodarray;
 544          }
 545  
 546          return $definitionobject;
 547      }
 548  
 549      /**
 550       * Recursively iterates through arrays. Any array without an id key-value combination
 551       * is assumed to be an array of values to be inserted and an id key-value is added with
 552       * the value matching the regex '/^NEWID\d+$/' that is expected by each grading form implementation.
 553       *
 554       * @param array $arraytoset the array to be processed
 555       * @param int $startnumber the starting number for the new id numbers
 556       * @return array with missing id keys added for all arrays
 557       * @since Moodle 2.8
 558       */
 559      private static function set_new_ids($arraytoset, $startnumber) {
 560          $result = array();
 561          $foundid = false;
 562          $number = $startnumber;
 563          foreach ($arraytoset as $key1 => $value1) {
 564              if (is_array($value1)) {
 565                  foreach ($value1 as $key2 => $value2) {
 566                      $processedvalue = self::set_new_ids($value2, $number);
 567                      $result[$key1][$processedvalue['id']] = $processedvalue;
 568                      $number++;
 569                  }
 570              } else {
 571                  $result[$key1] = $value1;
 572              }
 573              if ($key1 === 'id') {
 574                  $foundid = true;
 575              }
 576          }
 577          if (!$foundid) {
 578              $result['id'] = 'NEWID'.$number;
 579          }
 580          return $result;
 581      }
 582  
 583  }