3 // This file is part of Moodle - http://moodle.org/
5 // Moodle is free software: you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation, either version 3 of the License, or
8 // (at your option) any later version.
10 // Moodle is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU General Public License for more details.
15 // You should have received a copy of the GNU General Public License
16 // along with Moodle. If not, see <http://www.gnu.org/licenses/>.
18 require_once($CFG->dirroot.'/lib/gradelib.php');
19 require_once($CFG->dirroot.'/grade/lib.php');
20 require_once($CFG->dirroot.'/grade/export/grade_export_form.php');
25 abstract class grade_export {
27 public $plugin; // plgin name - must be filled in subclasses!
29 public $grade_items; // list of all course grade items
30 public $groupid; // groupid, 0 means all groups
31 public $course; // course object
32 public $columns; // array of grade_items selected for export
34 public $export_letters; // export letters
35 public $export_feedback; // export feedback
36 public $userkey; // export using private user key
38 public $updatedgradesonly; // only export updated grades
41 * Grade display type (real, percentages or letter).
43 * This attribute is an integer for XML file export. Otherwise is an array for all other formats (ODS, XLS and TXT).
45 * @var $displaytype Grade display type constant (1, 2 or 3) or an array of display types where the key is the name
46 * and the value is the grade display type constant or 0 for unchecked display types.
50 public $decimalpoints; // number of decimal points for exports
51 public $onlyactive; // only include users with an active enrolment
52 public $usercustomfields; // include users custom fields
55 * @deprecated since Moodle 2.8
56 * @var $previewrows Number of rows in preview.
61 * Constructor should set up all the private variables ready to be pulled.
63 * This constructor used to accept the individual parameters as separate arguments, in
64 * 2.8 this was simplified to just accept the data from the moodle form.
67 * @param object $course
69 * @param stdClass|null $formdata
70 * @note Exporting as letters will lead to data loss if that exported set it re-imported.
72 public function __construct($course, $groupid, $formdata) {
73 if (func_num_args() != 3 || ($formdata != null && get_class($formdata) != "stdClass")) {
74 $args = func_get_args();
75 return call_user_func_array(array($this, "deprecated_constructor"), $args);
77 $this->course = $course;
78 $this->groupid = $groupid;
80 $this->grade_items = grade_item::fetch_all(array('courseid'=>$this->course->id));
82 $this->process_form($formdata);
86 * Old deprecated constructor.
88 * This deprecated constructor accepts the individual parameters as separate arguments, in
89 * 2.8 this was simplified to just accept the data from the moodle form.
91 * @deprecated since 2.8 MDL-46548. Instead call the shortened constructor which accepts the data
92 * directly from the grade_export_form.
94 protected function deprecated_constructor($course,
97 $export_feedback=false,
98 $updatedgradesonly = false,
99 $displaytype = GRADE_DISPLAY_TYPE_REAL,
102 $usercustomfields = false) {
104 debugging('Many argument constructor for class "grade_export" is deprecated. Call the 3 argument version instead.', DEBUG_DEVELOPER);
106 $this->course = $course;
107 $this->groupid = $groupid;
109 $this->grade_items = grade_item::fetch_all(array('courseid'=>$this->course->id));
110 //Populating the columns here is required by /grade/export/(whatever)/export.php
111 //however index.php, when the form is submitted, will construct the collection here
112 //with an empty $itemlist then reconstruct it in process_form() using $formdata
113 $this->columns = array();
114 if (!empty($itemlist)) {
115 if ($itemlist=='-1') {
116 //user deselected all items
118 $itemids = explode(',', $itemlist);
119 // remove items that are not requested
120 foreach ($itemids as $itemid) {
121 if (array_key_exists($itemid, $this->grade_items)) {
122 $this->columns[$itemid] =& $this->grade_items[$itemid];
127 foreach ($this->grade_items as $itemid=>$unused) {
128 $this->columns[$itemid] =& $this->grade_items[$itemid];
132 $this->export_feedback = $export_feedback;
134 $this->previewrows = false;
135 $this->updatedgradesonly = $updatedgradesonly;
137 $this->displaytype = $displaytype;
138 $this->decimalpoints = $decimalpoints;
139 $this->onlyactive = $onlyactive;
140 $this->usercustomfields = $usercustomfields;
144 * Init object based using data from form
145 * @param object $formdata
147 function process_form($formdata) {
150 $this->columns = array();
151 if (!empty($formdata->itemids)) {
152 if ($formdata->itemids=='-1') {
153 //user deselected all items
155 foreach ($formdata->itemids as $itemid=>$selected) {
156 if ($selected and array_key_exists($itemid, $this->grade_items)) {
157 $this->columns[$itemid] =& $this->grade_items[$itemid];
162 foreach ($this->grade_items as $itemid=>$unused) {
163 $this->columns[$itemid] =& $this->grade_items[$itemid];
167 if (isset($formdata->key)) {
168 if ($formdata->key == 1 && isset($formdata->iprestriction) && isset($formdata->validuntil)) {
170 $formdata->key = create_user_key('grade/export', $USER->id, $this->course->id, $formdata->iprestriction, $formdata->validuntil);
172 $this->userkey = $formdata->key;
175 if (isset($formdata->decimals)) {
176 $this->decimalpoints = $formdata->decimals;
179 if (isset($formdata->export_letters)) {
180 $this->export_letters = $formdata->export_letters;
183 if (isset($formdata->export_feedback)) {
184 $this->export_feedback = $formdata->export_feedback;
187 if (isset($formdata->export_onlyactive)) {
188 $this->onlyactive = $formdata->export_onlyactive;
191 if (isset($formdata->previewrows)) {
192 $this->previewrows = $formdata->previewrows;
195 if (isset($formdata->display)) {
196 $this->displaytype = $formdata->display;
198 // Used by grade exports which accept multiple display types.
199 // If the checkbox value is 0 (unchecked) then remove it.
200 if (is_array($formdata->display)) {
201 $this->displaytype = array_filter($formdata->display);
205 if (isset($formdata->updatedgradesonly)) {
206 $this->updatedgradesonly = $formdata->updatedgradesonly;
211 * Update exported field in grade_grades table
214 public function track_exports() {
217 /// Whether this plugin is entitled to update export time
218 if ($expplugins = explode(",", $CFG->gradeexport)) {
219 if (in_array($this->plugin, $expplugins)) {
230 * Returns string representation of final grade
231 * @param object $grade instance of grade_grade class
232 * @param integer $gradedisplayconst grade display type constant.
235 public function format_grade($grade, $gradedisplayconst = null) {
236 $displaytype = $this->displaytype;
237 if (is_array($this->displaytype) && !is_null($gradedisplayconst)) {
238 $displaytype = $gradedisplayconst;
240 return grade_format_gradevalue($grade->finalgrade, $this->grade_items[$grade->itemid], false, $displaytype, $this->decimalpoints);
244 * Returns the name of column in export
245 * @param object $grade_item
246 * @param boolean $feedback feedback colum
247 * @param string $gradedisplayname grade display name.
250 public function format_column_name($grade_item, $feedback=false, $gradedisplayname = null) {
251 $column = new stdClass();
253 if ($grade_item->itemtype == 'mod') {
254 $column->name = get_string('modulename', $grade_item->itemmodule).get_string('labelsep', 'langconfig').$grade_item->get_name();
256 $column->name = $grade_item->get_name();
259 // We can't have feedback and display type at the same time.
260 $column->extra = ($feedback) ? get_string('feedback') : get_string($gradedisplayname, 'grades');
262 return html_to_text(get_string('gradeexportcolumntype', 'grades', $column), 0, false);
266 * Returns formatted grade feedback
267 * @param object $feedback object with properties feedback and feedbackformat
270 public function format_feedback($feedback) {
271 return strip_tags(format_text($feedback->feedback, $feedback->feedbackformat));
275 * Implemented by child class
277 public abstract function print_grades();
280 * Prints preview of exported grades on screen as a feedback mechanism
281 * @param bool $require_user_idnumber true means skip users without idnumber
282 * @deprecated since 2.8 MDL-46548. Previews are not useful on export.
284 public function display_preview($require_user_idnumber=false) {
287 debugging('function grade_export::display_preview is deprecated.', DEBUG_DEVELOPER);
289 $userprofilefields = grade_helper::get_user_profile_fields($this->course->id, $this->usercustomfields);
290 $formatoptions = new stdClass();
291 $formatoptions->para = false;
293 echo $OUTPUT->heading(get_string('previewrows', 'grades'));
297 foreach ($userprofilefields as $field) {
298 echo '<th>' . $field->fullname . '</th>';
300 if (!$this->onlyactive) {
301 echo '<th>'.get_string("suspended")."</th>";
303 foreach ($this->columns as $grade_item) {
304 echo '<th>'.$this->format_column_name($grade_item).'</th>';
306 /// add a column_feedback column
307 if ($this->export_feedback) {
308 echo '<th>'.$this->format_column_name($grade_item, true).'</th>';
312 /// Print all the lines of data.
314 $gui = new graded_users_iterator($this->course, $this->columns, $this->groupid);
315 $gui->require_active_enrolment($this->onlyactive);
316 $gui->allow_user_custom_fields($this->usercustomfields);
318 while ($userdata = $gui->next_user()) {
319 // number of preview rows
320 if ($this->previewrows and $this->previewrows <= $i) {
323 $user = $userdata->user;
324 if ($require_user_idnumber and empty($user->idnumber)) {
325 // some exports require user idnumber so we can match up students when importing the data
329 $gradeupdated = false; // if no grade is update at all for this user, do not display this row
331 foreach ($this->columns as $itemid=>$unused) {
332 $gradetxt = $this->format_grade($userdata->grades[$itemid]);
334 // get the status of this grade, and put it through track to get the status
335 $g = new grade_export_update_buffer();
336 $grade_grade = new grade_grade(array('itemid'=>$itemid, 'userid'=>$user->id));
337 $status = $g->track($grade_grade);
339 if ($this->updatedgradesonly && ($status == 'nochange' || $status == 'unknown')) {
340 $rowstr .= '<td>'.get_string('unchangedgrade', 'grades').'</td>';
342 $rowstr .= "<td>$gradetxt</td>";
343 $gradeupdated = true;
346 if ($this->export_feedback) {
347 $rowstr .= '<td>'.$this->format_feedback($userdata->feedbacks[$itemid]).'</td>';
351 // if we are requesting updated grades only, we are not interested in this user at all
352 if (!$gradeupdated && $this->updatedgradesonly) {
357 foreach ($userprofilefields as $field) {
358 $fieldvalue = grade_helper::get_user_field_value($user, $field);
359 // @see profile_field_base::display_data().
360 echo '<td>' . format_text($fieldvalue, FORMAT_MOODLE, $formatoptions) . '</td>';
362 if (!$this->onlyactive) {
363 $issuspended = ($user->suspendedenrolment) ? get_string('yes') : '';
364 echo "<td>$issuspended</td>";
369 $i++; // increment the counter
376 * Returns array of parameters used by dump.php and export.php.
379 public function get_export_params() {
380 $itemids = array_keys($this->columns);
381 $itemidsparam = implode(',', $itemids);
382 if (empty($itemidsparam)) {
383 $itemidsparam = '-1';
386 $params = array('id' =>$this->course->id,
387 'groupid' =>$this->groupid,
388 'itemids' =>$itemidsparam,
389 'export_letters' =>$this->export_letters,
390 'export_feedback' =>$this->export_feedback,
391 'updatedgradesonly' =>$this->updatedgradesonly,
392 'displaytype' =>$this->displaytype,
393 'decimalpoints' =>$this->decimalpoints,
394 'export_onlyactive' =>$this->onlyactive,
395 'usercustomfields' =>$this->usercustomfields);
401 * Either prints a "Export" box, which will redirect the user to the download page,
402 * or prints the URL for the published data.
404 * @deprecated since 2.8 MDL-46548. Call get_export_url and set the
405 * action of the grade_export_form instead.
408 public function print_continue() {
409 global $CFG, $OUTPUT;
411 debugging('function grade_export::print_continue is deprecated.', DEBUG_DEVELOPER);
412 $params = $this->get_export_params();
414 echo $OUTPUT->heading(get_string('export', 'grades'));
416 echo $OUTPUT->container_start('gradeexportlink');
418 if (!$this->userkey) {
419 // This button should trigger a download prompt.
420 $url = new moodle_url('/grade/export/'.$this->plugin.'/export.php', $params);
421 echo $OUTPUT->single_button($url, get_string('download', 'admin'));
426 foreach($params as $name=>$value) {
427 $paramstr .= $sep.$name.'='.$value;
431 $link = $CFG->wwwroot.'/grade/export/'.$this->plugin.'/dump.php'.$paramstr.'&key='.$this->userkey;
433 echo get_string('download', 'admin').': ' . html_writer::link($link, $link);
435 echo $OUTPUT->container_end();
442 * This class is used to update the exported field in grade_grades.
443 * It does internal buffering to speedup the db operations.
445 class grade_export_update_buffer {
450 * Constructor - creates the buffer and initialises the time stamp
452 public function grade_export_update_buffer() {
453 $this->update_list = array();
454 $this->export_time = time();
457 public function flush($buffersize) {
460 if (count($this->update_list) > $buffersize) {
461 list($usql, $params) = $DB->get_in_or_equal($this->update_list);
462 $params = array_merge(array($this->export_time), $params);
464 $sql = "UPDATE {grade_grades} SET exported = ? WHERE id $usql";
465 $DB->execute($sql, $params);
466 $this->update_list = array();
471 * Track grade export status
472 * @param object $grade_grade
473 * @return string $status (unknow, new, regrade, nochange)
475 public function track($grade_grade) {
477 if (empty($grade_grade->exported) or empty($grade_grade->timemodified)) {
478 if (is_null($grade_grade->finalgrade)) {
479 // grade does not exist yet
483 $this->update_list[] = $grade_grade->id;
486 } else if ($grade_grade->exported < $grade_grade->timemodified) {
488 $this->update_list[] = $grade_grade->id;
490 } else if ($grade_grade->exported >= $grade_grade->timemodified) {
491 $status = 'nochange';
494 // something is wrong?
504 * Flush and close the buffer.
506 public function close() {
512 * Verify that there is a valid set of grades to export.
513 * @param $courseid int The course being exported
515 function export_verify_grades($courseid) {
516 $regraderesult = grade_regrade_final_grades($courseid);
517 if (is_array($regraderesult)) {
518 throw new moodle_exception('gradecantregrade', 'error', '', implode(', ', array_unique($regraderesult)));