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MDL-36985 core_files: added option to remove draft files on save

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text areas can now specify $options['removeorphaneddrafts'] when saving
their data using file_postupdate_standard_editor(). If set to true,
this option clears all user drafts which are not referenced in the text
This commit is contained in:
Jake Dallimore 2017-07-27 16:47:09 +08:00
parent 27466d7548
commit f3c2afd0e8
3 changed files with 91 additions and 6 deletions
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39
lib/filelib.php
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@ -237,6 +237,9 @@ function file_postupdate_standard_editor($data, $field, array $options, $context
if (!isset($options['maxbytes'])) {
$options['maxbytes'] = 0; // unlimited
}
if (!isset($options['removeorphaneddrafts'])) {
$options['removeorphaneddrafts'] = false; // Don't remove orphaned draft files by default.
}
if ($options['trusttext']) {
$data->{$field.'trust'} = trusttext_trusted($context);
@ -249,6 +252,10 @@ function file_postupdate_standard_editor($data, $field, array $options, $context
if ($options['maxfiles'] == 0 or is_null($filearea) or is_null($itemid) or empty($editor['itemid'])) {
$data->{$field} = $editor['text'];
} else {
// Clean the user drafts area of any files not referenced in the editor text.
if ($options['removeorphaneddrafts']) {
file_remove_editor_orphaned_files($editor);
}
$data->{$field} = file_save_draft_area_files($editor['itemid'], $context->id, $component, $filearea, $itemid, $options, $editor['text'], $options['forcehttps']);
}
$data->{$field.'format'} = $editor['format'];
@ -792,6 +799,38 @@ function file_restore_source_field_from_draft_file($storedfile) {
}
return $storedfile;
}
/**
* Removes those files from the user drafts filearea which are not referenced in the editor text.
*
* @param stdClass $editor The online text editor element from the submitted form data.
*/
function file_remove_editor_orphaned_files($editor) {
global $CFG, $USER;
// Find those draft files included in the text, and generate their hashes.
$context = context_user::instance($USER->id);
$baseurl = $CFG->wwwroot . '/draftfile.php/' . $context->id . '/user/draft/' . $editor['itemid'] . '/';
$pattern = "/" . preg_quote($baseurl, '/') . "(.+?)[\?\"']/";
preg_match_all($pattern, $editor['text'], $matches);
$usedfilehashes = [];
foreach ($matches[1] as $matchedfilename) {
$matchedfilename = urldecode($matchedfilename);
$usedfilehashes[] = \file_storage::get_pathname_hash($context->id, 'user', 'draft', $editor['itemid'], '/',
$matchedfilename);
}
// Now, compare the hashes of all draft files, and remove those which don't match used files.
$fs = get_file_storage();
$files = $fs->get_area_files($context->id, 'user', 'draft', $editor['itemid'], 'id', false);
foreach ($files as $file) {
$tmphash = $file->get_pathnamehash();
if (!in_array($tmphash, $usedfilehashes)) {
$file->delete();
}
}
}
/**
* Saves files from a draft file area to a real one (merging the list of files).
* Can rewrite URLs in some content at the same time if desired.