mirrored from git://git.moodle.org/moodle.git
/
document_services.php
812 lines (689 loc) · 33.1 KB
/
document_services.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* This file contains the ingest manager for the assignfeedback_editpdf plugin
*
* @package assignfeedback_editpdf
* @copyright 2012 Davo Smith
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace assignfeedback_editpdf;
use DOMDocument;
/**
* Functions for generating the annotated pdf.
*
* This class controls the ingest of student submission files to a normalised
* PDF 1.4 document with all submission files concatinated together. It also
* provides the functions to generate a downloadable pdf with all comments and
* annotations embedded.
* @copyright 2012 Davo Smith
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class document_services {
/** File area for generated pdf */
const FINAL_PDF_FILEAREA = 'download';
/** File area for combined pdf */
const COMBINED_PDF_FILEAREA = 'combined';
/** File area for partial combined pdf */
const PARTIAL_PDF_FILEAREA = 'partial';
/** File area for importing html */
const IMPORT_HTML_FILEAREA = 'importhtml';
/** File area for page images */
const PAGE_IMAGE_FILEAREA = 'pages';
/** File area for readonly page images */
const PAGE_IMAGE_READONLY_FILEAREA = 'readonlypages';
/** File area for the stamps */
const STAMPS_FILEAREA = 'stamps';
/** Filename for combined pdf */
const COMBINED_PDF_FILENAME = 'combined.pdf';
/** Hash of blank pdf */
const BLANK_PDF_HASH = '4c803c92c71f21b423d13de570c8a09e0a31c718';
/** Base64 encoded blank pdf. This is the most reliable/fastest way to generate a blank pdf. */
const BLANK_PDF_BASE64 = <<<EOD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EOD;
/**
* This function will take an int or an assignment instance and
* return an assignment instance. It is just for convenience.
* @param int|\assign $assignment
* @return assign
*/
private static function get_assignment_from_param($assignment) {
global $CFG;
require_once($CFG->dirroot . '/mod/assign/locallib.php');
if (!is_object($assignment)) {
$cm = get_coursemodule_from_instance('assign', $assignment, 0, false, MUST_EXIST);
$context = \context_module::instance($cm->id);
$assignment = new \assign($context, null, null);
}
return $assignment;
}
/**
* Get a hash that will be unique and can be used in a path name.
* @param int|\assign $assignment
* @param int $userid
* @param int $attemptnumber (-1 means latest attempt)
*/
private static function hash($assignment, $userid, $attemptnumber) {
if (is_object($assignment)) {
$assignmentid = $assignment->get_instance()->id;
} else {
$assignmentid = $assignment;
}
return sha1($assignmentid . '_' . $userid . '_' . $attemptnumber);
}
/**
* Use a DOM parser to accurately replace images with their alt text.
* @param string $html
* @return string New html with no image tags.
*/
protected static function strip_images($html) {
// Load HTML and suppress any parsing errors (DOMDocument->loadHTML() does not current support HTML5 tags).
$dom = new DOMDocument();
libxml_use_internal_errors(true);
$dom->loadHTML('<?xml version="1.0" encoding="UTF-8" ?>' . $html);
libxml_clear_errors();
// Find all img tags.
if ($imgnodes = $dom->getElementsByTagName('img')) {
// Replace img nodes with the img alt text without overriding DOM elements.
for ($i = ($imgnodes->length - 1); $i >= 0; $i--) {
$imgnode = $imgnodes->item($i);
$alt = ($imgnode->hasAttribute('alt')) ? ' [ ' . $imgnode->getAttribute('alt') . ' ] ' : ' ';
$textnode = $dom->createTextNode($alt);
$imgnode->parentNode->replaceChild($textnode, $imgnode);
}
}
$count = 1;
return str_replace("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>", "", $dom->saveHTML(), $count);
}
/**
* This function will search for all files that can be converted
* and concatinated into a PDF (1.4) - for any submission plugin
* for this students attempt.
*
* @param int|\assign $assignment
* @param int $userid
* @param int $attemptnumber (-1 means latest attempt)
* @return combined_document
*/
protected static function list_compatible_submission_files_for_attempt($assignment, $userid, $attemptnumber) {
global $USER, $DB;
$assignment = self::get_assignment_from_param($assignment);
// Capability checks.
if (!$assignment->can_view_submission($userid)) {
print_error('nopermission');
}
$files = array();
if ($assignment->get_instance()->teamsubmission) {
$submission = $assignment->get_group_submission($userid, 0, false, $attemptnumber);
} else {
$submission = $assignment->get_user_submission($userid, false, $attemptnumber);
}
$user = $DB->get_record('user', array('id' => $userid));
// User has not submitted anything yet.
if (!$submission) {
return new combined_document();
}
$fs = get_file_storage();
$converter = new \core_files\converter();
// Ask each plugin for it's list of files.
foreach ($assignment->get_submission_plugins() as $plugin) {
if ($plugin->is_enabled() && $plugin->is_visible()) {
$pluginfiles = $plugin->get_files($submission, $user);
foreach ($pluginfiles as $filename => $file) {
if ($file instanceof \stored_file) {
if ($file->get_mimetype() === 'application/pdf') {
$files[$filename] = $file;
} else if ($convertedfile = $converter->start_conversion($file, 'pdf')) {
$files[$filename] = $convertedfile;
}
} else if ($converter->can_convert_format_to('html', 'pdf')) {
// Create a tmp stored_file from this html string.
$file = reset($file);
// Strip image tags, because they will not be resolvable.
$file = self::strip_images($file);
$record = new \stdClass();
$record->contextid = $assignment->get_context()->id;
$record->component = 'assignfeedback_editpdf';
$record->filearea = self::IMPORT_HTML_FILEAREA;
$record->itemid = $submission->id;
$record->filepath = '/';
$record->filename = $plugin->get_type() . '-' . $filename;
$htmlfile = $fs->get_file($record->contextid,
$record->component,
$record->filearea,
$record->itemid,
$record->filepath,
$record->filename);
$newhash = sha1($file);
// If the file exists, and the content hash doesn't match, remove it.
if ($htmlfile && $newhash !== $htmlfile->get_contenthash()) {
$htmlfile->delete();
$htmlfile = false;
}
// If the file doesn't exist, or if it was removed above, create a new one.
if (!$htmlfile) {
$htmlfile = $fs->create_file_from_string($record, $file);
}
$convertedfile = $converter->start_conversion($htmlfile, 'pdf');
if ($convertedfile) {
$files[$filename] = $convertedfile;
}
}
}
}
}
$combineddocument = new combined_document();
$combineddocument->set_source_files($files);
return $combineddocument;
}
/**
* Fetch the current combined document ready for state checking.
*
* @param int|\assign $assignment
* @param int $userid
* @param int $attemptnumber (-1 means latest attempt)
* @return combined_document
*/
public static function get_combined_document_for_attempt($assignment, $userid, $attemptnumber) {
global $USER, $DB;
$assignment = self::get_assignment_from_param($assignment);
// Capability checks.
if (!$assignment->can_view_submission($userid)) {
print_error('nopermission');
}
$grade = $assignment->get_user_grade($userid, true, $attemptnumber);
if ($assignment->get_instance()->teamsubmission) {
$submission = $assignment->get_group_submission($userid, 0, false, $attemptnumber);
} else {
$submission = $assignment->get_user_submission($userid, false, $attemptnumber);
}
$contextid = $assignment->get_context()->id;
$component = 'assignfeedback_editpdf';
$filearea = self::COMBINED_PDF_FILEAREA;
$partialfilearea = self::PARTIAL_PDF_FILEAREA;
$itemid = $grade->id;
$filepath = '/';
$filename = self::COMBINED_PDF_FILENAME;
$fs = get_file_storage();
$partialpdf = $fs->get_file($contextid, $component, $partialfilearea, $itemid, $filepath, $filename);
if (!empty($partialpdf)) {
$combinedpdf = $partialpdf;
} else {
$combinedpdf = $fs->get_file($contextid, $component, $filearea, $itemid, $filepath, $filename);
}
if ($combinedpdf && $submission) {
if ($combinedpdf->get_timemodified() < $submission->timemodified) {
// The submission has been updated since the PDF was generated.
$combinedpdf = false;
} else if ($combinedpdf->get_contenthash() == self::BLANK_PDF_HASH) {
// The PDF is for a blank page.
$combinedpdf = false;
}
}
if (empty($combinedpdf)) {
// The combined PDF does not exist yet. Return the list of files to be combined.
return self::list_compatible_submission_files_for_attempt($assignment, $userid, $attemptnumber);
} else {
// The combined PDF aleady exists. Return it in a new combined_document object.
$combineddocument = new combined_document();
return $combineddocument->set_combined_file($combinedpdf);
}
}
/**
* This function return the combined pdf for all valid submission files.
*
* @param int|\assign $assignment
* @param int $userid
* @param int $attemptnumber (-1 means latest attempt)
* @return combined_document
*/
public static function get_combined_pdf_for_attempt($assignment, $userid, $attemptnumber) {
$document = self::get_combined_document_for_attempt($assignment, $userid, $attemptnumber);
if ($document->get_status() === combined_document::STATUS_COMPLETE) {
// The combined document is already ready.
return $document;
} else {
// Attempt to combined the files in the document.
$grade = $assignment->get_user_grade($userid, true, $attemptnumber);
$document->combine_files($assignment->get_context()->id, $grade->id);
return $document;
}
}
/**
* This function will return the number of pages of a pdf.
*
* @param int|\assign $assignment
* @param int $userid
* @param int $attemptnumber (-1 means latest attempt)
* @param bool $readonly When true we get the number of pages for the readonly version.
* @return int number of pages
*/
public static function page_number_for_attempt($assignment, $userid, $attemptnumber, $readonly = false) {
global $CFG;
require_once($CFG->libdir . '/pdflib.php');
$assignment = self::get_assignment_from_param($assignment);
if (!$assignment->can_view_submission($userid)) {
print_error('nopermission');
}
// When in readonly we can return the number of images in the DB because they should already exist,
// if for some reason they do not, then we proceed as for the normal version.
if ($readonly) {
$grade = $assignment->get_user_grade($userid, true, $attemptnumber);
$fs = get_file_storage();
$files = $fs->get_directory_files($assignment->get_context()->id, 'assignfeedback_editpdf',
self::PAGE_IMAGE_READONLY_FILEAREA, $grade->id, '/');
$pagecount = count($files);
if ($pagecount > 0) {
return $pagecount;
}
}
// Get a combined pdf file from all submitted pdf files.
$document = self::get_combined_pdf_for_attempt($assignment, $userid, $attemptnumber);
return $document->get_page_count();
}
/**
* This function will generate and return a list of the page images from a pdf.
* @param int|\assign $assignment
* @param int $userid
* @param int $attemptnumber (-1 means latest attempt)
* @return array(stored_file)
*/
protected static function generate_page_images_for_attempt($assignment, $userid, $attemptnumber) {
global $CFG;
require_once($CFG->libdir . '/pdflib.php');
$assignment = self::get_assignment_from_param($assignment);
if (!$assignment->can_view_submission($userid)) {
print_error('nopermission');
}
// Need to generate the page images - first get a combined pdf.
$document = self::get_combined_pdf_for_attempt($assignment, $userid, $attemptnumber);
$status = $document->get_status();
if ($status === combined_document::STATUS_FAILED) {
print_error('Could not generate combined pdf.');
} else if ($status === combined_document::STATUS_PENDING_INPUT) {
// The conversion is still in progress.
return [];
}
$tmpdir = \make_temp_directory('assignfeedback_editpdf/pageimages/' . self::hash($assignment, $userid, $attemptnumber));
$combined = $tmpdir . '/' . self::COMBINED_PDF_FILENAME;
$document->get_combined_file()->copy_content_to($combined); // Copy the file.
$pdf = new pdf();
$pdf->set_image_folder($tmpdir);
$pagecount = $pdf->set_pdf($combined);
$grade = $assignment->get_user_grade($userid, true, $attemptnumber);
$record = new \stdClass();
$record->contextid = $assignment->get_context()->id;
$record->component = 'assignfeedback_editpdf';
$record->filearea = self::PAGE_IMAGE_FILEAREA;
$record->itemid = $grade->id;
$record->filepath = '/';
$fs = get_file_storage();
// Remove the existing content of the filearea.
$fs->delete_area_files($record->contextid, $record->component, $record->filearea, $record->itemid);
$files = array();
for ($i = 0; $i < $pagecount; $i++) {
try {
$image = $pdf->get_image($i);
} catch (\moodle_exception $e) {
// We catch only moodle_exception here as other exceptions indicate issue with setup not the pdf.
$image = pdf::get_error_image($tmpdir, $i);
}
$record->filename = basename($image);
$files[$i] = $fs->create_file_from_pathname($record, $tmpdir . '/' . $image);
@unlink($tmpdir . '/' . $image);
}
$pdf->Close(); // PDF loaded and never saved/outputted needs to be closed.
@unlink($combined);
@rmdir($tmpdir);
return $files;
}
/**
* This function returns a list of the page images from a pdf.
*
* The readonly version is different than the normal one. The readonly version contains a copy
* of the pages in the state they were when the PDF was annotated, by doing so we prevent the
* the pages that are displayed to change as soon as the submission changes.
*
* Though there is an edge case, if the PDF was annotated before MDL-45580, then it is possible
* that we do not find any readonly version of the pages. In that case, we will get the normal
* pages and copy them to the readonly area. This ensures that the pages will remain in that
* state until the submission is updated. When the normal files do not exist, we throw an exception
* because the readonly pages should only ever be displayed after a teacher has annotated the PDF,
* they would not exist until they do.
*
* @param int|\assign $assignment
* @param int $userid
* @param int $attemptnumber (-1 means latest attempt)
* @param bool $readonly If true, then we are requesting the readonly version.
* @return array(stored_file)
*/
public static function get_page_images_for_attempt($assignment, $userid, $attemptnumber, $readonly = false) {
global $DB;
$assignment = self::get_assignment_from_param($assignment);
if (!$assignment->can_view_submission($userid)) {
print_error('nopermission');
}
if ($assignment->get_instance()->teamsubmission) {
$submission = $assignment->get_group_submission($userid, 0, false, $attemptnumber);
} else {
$submission = $assignment->get_user_submission($userid, false, $attemptnumber);
}
$grade = $assignment->get_user_grade($userid, true, $attemptnumber);
$contextid = $assignment->get_context()->id;
$component = 'assignfeedback_editpdf';
$itemid = $grade->id;
$filepath = '/';
$filearea = self::PAGE_IMAGE_FILEAREA;
$fs = get_file_storage();
// If we are after the readonly pages...
if ($readonly) {
$filearea = self::PAGE_IMAGE_READONLY_FILEAREA;
if ($fs->is_area_empty($contextid, $component, $filearea, $itemid)) {
// We have a problem here, we were supposed to find the files.
// Attempt to re-generate the pages from the combined images.
self::generate_page_images_for_attempt($assignment, $userid, $attemptnumber);
self::copy_pages_to_readonly_area($assignment, $grade);
}
}
$files = $fs->get_directory_files($contextid, $component, $filearea, $itemid, $filepath);
$pages = array();
if (!empty($files)) {
$first = reset($files);
$pagemodified = $first->get_timemodified();
// Check that we don't just have a single blank page. The hash of a blank page image can vary with
// the version of ghostscript used, so we need to examine the combined pdf it was generated from.
$blankpage = false;
if (!$readonly && count($files) == 1) {
$pdfarea = self::COMBINED_PDF_FILEAREA;
$pdfname = self::COMBINED_PDF_FILENAME;
if ($pdf = $fs->get_file($contextid, $component, $pdfarea, $itemid, $filepath, $pdfname)) {
// The combined pdf may have a different hash if it has been regenerated since the page
// image was created. However if this is the case the page image will be stale anyway.
if ($pdf->get_contenthash() == self::BLANK_PDF_HASH || $pagemodified < $pdf->get_timemodified()) {
$blankpage = true;
}
}
}
if (!$readonly && ($pagemodified < $submission->timemodified || $blankpage)) {
// Image files are stale, we need to regenerate them, except in readonly mode.
// We also need to remove the draft annotations and comments associated with this attempt.
$fs->delete_area_files($contextid, $component, $filearea, $itemid);
page_editor::delete_draft_content($itemid);
$files = array();
} else {
// Need to reorder the files following their name.
// because get_directory_files() return a different order than generate_page_images_for_attempt().
foreach($files as $file) {
// Extract the page number from the file name image_pageXXXX.png.
preg_match('/page([\d]+)\./', $file->get_filename(), $matches);
if (empty($matches) or !is_numeric($matches[1])) {
throw new \coding_exception("'" . $file->get_filename()
. "' file hasn't the expected format filename: image_pageXXXX.png.");
}
$pagenumber = (int)$matches[1];
// Save the page in the ordered array.
$pages[$pagenumber] = $file;
}
ksort($pages);
}
}
if (empty($pages)) {
if ($readonly) {
// This should never happen, there should be a version of the pages available
// whenever we are requesting the readonly version.
throw new \moodle_exception('Could not find readonly pages for grade ' . $grade->id);
}
$pages = self::generate_page_images_for_attempt($assignment, $userid, $attemptnumber);
}
return $pages;
}
/**
* This function returns sensible filename for a feedback file.
* @param int|\assign $assignment
* @param int $userid
* @param int $attemptnumber (-1 means latest attempt)
* @return string
*/
protected static function get_downloadable_feedback_filename($assignment, $userid, $attemptnumber) {
global $DB;
$assignment = self::get_assignment_from_param($assignment);
$groupmode = groups_get_activity_groupmode($assignment->get_course_module());
$groupname = '';
if ($groupmode) {
$groupid = groups_get_activity_group($assignment->get_course_module(), true);
$groupname = groups_get_group_name($groupid).'-';
}
if ($groupname == '-') {
$groupname = '';
}
$grade = $assignment->get_user_grade($userid, true, $attemptnumber);
$user = $DB->get_record('user', array('id'=>$userid), '*', MUST_EXIST);
if ($assignment->is_blind_marking()) {
$prefix = $groupname . get_string('participant', 'assign');
$prefix = str_replace('_', ' ', $prefix);
$prefix = clean_filename($prefix . '_' . $assignment->get_uniqueid_for_user($userid) . '_');
} else {
$prefix = $groupname . fullname($user);
$prefix = str_replace('_', ' ', $prefix);
$prefix = clean_filename($prefix . '_' . $assignment->get_uniqueid_for_user($userid) . '_');
}
$prefix .= $grade->attemptnumber;
return $prefix . '.pdf';
}
/**
* This function takes the combined pdf and embeds all the comments and annotations.
*
* This also moves the annotations and comments from drafts to not drafts. And it will
* copy all the images stored to the readonly area, so that they can be viewed online, and
* not be overwritten when a new submission is sent.
*
* @param int|\assign $assignment
* @param int $userid
* @param int $attemptnumber (-1 means latest attempt)
* @return stored_file
*/
public static function generate_feedback_document($assignment, $userid, $attemptnumber) {
$assignment = self::get_assignment_from_param($assignment);
if (!$assignment->can_view_submission($userid)) {
print_error('nopermission');
}
if (!$assignment->can_grade()) {
print_error('nopermission');
}
// Need to generate the page images - first get a combined pdf.
$document = self::get_combined_pdf_for_attempt($assignment, $userid, $attemptnumber);
$status = $document->get_status();
if ($status === combined_document::STATUS_FAILED) {
print_error('Could not generate combined pdf.');
} else if ($status === combined_document::STATUS_PENDING_INPUT) {
// The conversion is still in progress.
return false;
}
$file = $document->get_combined_file();
$tmpdir = make_temp_directory('assignfeedback_editpdf/final/' . self::hash($assignment, $userid, $attemptnumber));
$combined = $tmpdir . '/' . self::COMBINED_PDF_FILENAME;
$file->copy_content_to($combined); // Copy the file.
$pdf = new pdf();
$fs = get_file_storage();
$stamptmpdir = make_temp_directory('assignfeedback_editpdf/stamps/' . self::hash($assignment, $userid, $attemptnumber));
$grade = $assignment->get_user_grade($userid, true, $attemptnumber);
// Copy any new stamps to this instance.
if ($files = $fs->get_area_files($assignment->get_context()->id,
'assignfeedback_editpdf',
'stamps',
$grade->id,
"filename",
false)) {
foreach ($files as $file) {
$filename = $stamptmpdir . '/' . $file->get_filename();
$file->copy_content_to($filename); // Copy the file.
}
}
$pagecount = $pdf->set_pdf($combined);
$grade = $assignment->get_user_grade($userid, true, $attemptnumber);
page_editor::release_drafts($grade->id);
$allcomments = array();
for ($i = 0; $i < $pagecount; $i++) {
$pdf->copy_page();
$comments = page_editor::get_comments($grade->id, $i, false);
$annotations = page_editor::get_annotations($grade->id, $i, false);
if (!empty($comments)) {
$allcomments[$i] = $comments;
}
foreach ($annotations as $annotation) {
$pdf->add_annotation($annotation->x,
$annotation->y,
$annotation->endx,
$annotation->endy,
$annotation->colour,
$annotation->type,
$annotation->path,
$stamptmpdir);
}
}
if (!empty($allcomments)) {
// Append all comments to the end of the document.
$links = $pdf->append_comments($allcomments);
// Add the comment markers with links.
foreach ($allcomments as $pageno => $comments) {
foreach ($comments as $index => $comment) {
$pdf->add_comment_marker($comment->pageno, $index, $comment->x, $comment->y, $links[$pageno][$index],
$comment->colour);
}
}
}
fulldelete($stamptmpdir);
$filename = self::get_downloadable_feedback_filename($assignment, $userid, $attemptnumber);
$filename = clean_param($filename, PARAM_FILE);
$generatedpdf = $tmpdir . '/' . $filename;
$pdf->save_pdf($generatedpdf);
$record = new \stdClass();
$record->contextid = $assignment->get_context()->id;
$record->component = 'assignfeedback_editpdf';
$record->filearea = self::FINAL_PDF_FILEAREA;
$record->itemid = $grade->id;
$record->filepath = '/';
$record->filename = $filename;
// Only keep one current version of the generated pdf.
$fs->delete_area_files($record->contextid, $record->component, $record->filearea, $record->itemid);
$file = $fs->create_file_from_pathname($record, $generatedpdf);
// Cleanup.
@unlink($generatedpdf);
@unlink($combined);
@rmdir($tmpdir);
self::copy_pages_to_readonly_area($assignment, $grade);
return $file;
}
/**
* Copy the pages image to the readonly area.
*
* @param int|\assign $assignment The assignment.
* @param \stdClass $grade The grade record.
* @return void
*/
public static function copy_pages_to_readonly_area($assignment, $grade) {
$fs = get_file_storage();
$assignment = self::get_assignment_from_param($assignment);
$contextid = $assignment->get_context()->id;
$component = 'assignfeedback_editpdf';
$itemid = $grade->id;
// Get all the pages.
$originalfiles = $fs->get_area_files($contextid, $component, self::PAGE_IMAGE_FILEAREA, $itemid);
if (empty($originalfiles)) {
// Nothing to do here...
return;
}
// Delete the old readonly files.
$fs->delete_area_files($contextid, $component, self::PAGE_IMAGE_READONLY_FILEAREA, $itemid);
// Do the copying.
foreach ($originalfiles as $originalfile) {
$fs->create_file_from_storedfile(array('filearea' => self::PAGE_IMAGE_READONLY_FILEAREA), $originalfile);
}
}
/**
* This function returns the generated pdf (if it exists).
* @param int|\assign $assignment
* @param int $userid
* @param int $attemptnumber (-1 means latest attempt)
* @return stored_file
*/
public static function get_feedback_document($assignment, $userid, $attemptnumber) {
$assignment = self::get_assignment_from_param($assignment);
if (!$assignment->can_view_submission($userid)) {
print_error('nopermission');
}
$grade = $assignment->get_user_grade($userid, true, $attemptnumber);
$contextid = $assignment->get_context()->id;
$component = 'assignfeedback_editpdf';
$filearea = self::FINAL_PDF_FILEAREA;
$itemid = $grade->id;
$filepath = '/';
$fs = get_file_storage();
$files = $fs->get_area_files($contextid,
$component,
$filearea,
$itemid,
"itemid, filepath, filename",
false);
if ($files) {
return reset($files);
}
return false;
}
/**
* This function deletes the generated pdf for a student.
* @param int|\assign $assignment
* @param int $userid
* @param int $attemptnumber (-1 means latest attempt)
* @return bool
*/
public static function delete_feedback_document($assignment, $userid, $attemptnumber) {
$assignment = self::get_assignment_from_param($assignment);
if (!$assignment->can_view_submission($userid)) {
print_error('nopermission');
}
if (!$assignment->can_grade()) {
print_error('nopermission');
}
$grade = $assignment->get_user_grade($userid, true, $attemptnumber);
$contextid = $assignment->get_context()->id;
$component = 'assignfeedback_editpdf';
$filearea = self::FINAL_PDF_FILEAREA;
$itemid = $grade->id;
$fs = get_file_storage();
return $fs->delete_area_files($contextid, $component, $filearea, $itemid);
}
}