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MDL-56122 assignfeedback_editpdf: Regenerate PDF & page images if blank

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This commit is contained in:
Tony Butler 2017-01-18 23:21:30 +00:00
parent 7a3b115d37
commit fecfb4c6fb
1 changed files with 24 additions and 4 deletions
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28
mod/assign/feedback/editpdf/classes/document_services.php
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@ -52,6 +52,8 @@ class document_services {
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
@ -243,9 +245,11 @@ EOD;
$filename = self::COMBINED_PDF_FILENAME;
$fs = \get_file_storage();
$combinedpdf = $fs->get_file($contextid, $component, $filearea, $itemid, $filepath, $filename);
if (!$combinedpdf ||
($submission && ($combinedpdf->get_timemodified() < $submission->timemodified))) {
if (!$combinedpdf = $fs->get_file($contextid, $component, $filearea, $itemid, $filepath, $filename)) {
return self::generate_combined_pdf_for_attempt($assignment, $userid, $attemptnumber);
}
if ($submission && ($combinedpdf->get_timemodified() < $submission->timemodified ||
$combinedpdf->get_contenthash() == self::BLANK_PDF_HASH)) {
return self::generate_combined_pdf_for_attempt($assignment, $userid, $attemptnumber);
}
return $combinedpdf;
@ -478,6 +482,7 @@ EOD;
* @return array(stored_file)
*/
public static function get_page_images_for_attempt($assignment, $userid, $attemptnumber, $readonly = false) {
global $DB;
$assignment = self::get_assignment_from_param($assignment);
@ -516,7 +521,22 @@ EOD;
$pages = array();
if (!empty($files)) {
$first = reset($files);
if (!$readonly && $first->get_timemodified() < $submission->timemodified) {
$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);