Allow specification of a site-wide maximum quota (Closes: #628736).

Signed-off-by: Andrew Robert Nicols <andrew.nicols@luns.net.uk>

htdocs/admin/users/edit.php

@@ -162,6 +162,15 @@ $siteform = pieform(array(
     'elements'   => $elements,
 ));
 
+function edituser_site_validate(Pieform $form, $values) {
+    global $USER, $SESSION;
+    $maxquotaenabled = get_config_plugin('artefact', 'file', 'maxquotaenabled');
+    $maxquota = get_config_plugin('artefact', 'file', 'maxquota');
+    if ($maxquotaenabled && $values['quota'] > $maxquota) {
+        $form->set_error('quota', get_string('maxquotaexceededform', 'artefact.file', display_size($maxquota)));
+        $SESSION->add_error_msg(get_string('maxquotaexceeded', 'artefact.file', display_size($maxquota)));
+    }
+}
 
 function edituser_site_submit(Pieform $form, $values) {
     if (!$user = get_record('usr', 'id', $values['id'])) {

htdocs/artefact/file/lang/en.utf8/artefact.file.php

@@ -51,6 +51,12 @@ $string['Date'] = 'Date';
 $string['defaultagreement'] = 'Default Agreement';
 $string['defaultquota'] = 'Default Quota';
 $string['defaultquotadescription'] = 'You can set the amount of disk space that new users will have as their quota here. Existing user quotas will not be changed.';
+$string['maxquotaenabled'] = 'Enforce a site-wide maximum quota';
+$string['maxquota'] = 'Maximum Quota';
+$string['maxquotatoolow'] = 'The maximum quota cannot be lower than the default quota.';
+$string['maxquotaexceeded'] = 'You specified a quota above the maximum available setting for this site (%s). Try specifying a lower value or contact the site administrator to have them increase the maximum quota.';
+$string['maxquotaexceededform'] = 'Please specify a file quota of less than %s.';
+$string['maxquotadescription'] = 'You can set the maximum quota that an administrator can give to a user. Existing user quotas will not be affected.';
 $string['deletefile?'] = 'Are you sure you want to delete this file?';
 $string['deletefolder?'] = 'Are you sure you want to delete this folder?';
 $string['Description'] = 'Description';

htdocs/artefact/file/lib.php

@@ -1060,6 +1060,32 @@ class ArtefactTypeFile extends ArtefactTypeFileBase {
             'collapsible' => true
         );
 
+        $maxquota = get_config_plugin('artefact', 'file', 'maxquota');
+        $maxquotaenabled = get_config_plugin('artefact', 'file', 'maxquotaenabled');
+        if (empty($maxquota)) {
+            $maxquota = 1024 * 1024 * 1024;
+        }
+        $elements['maxquota'] = array(
+            'type' => 'fieldset',
+            'legend' => get_string('maxquota', 'artefact.file'),
+            'elements' => array(
+                'maxquotadescription' => array(
+                    'value' => '<tr><td colspan="2">' . get_string('maxquotadescription', 'artefact.file') . '</td></tr>'
+                ),
+                'maxquotaenabled' => array(
+                    'title'        => get_string('maxquotaenabled', 'artefact.file'),
+                    'type'         => 'checkbox',
+                    'defaultvalue' => $maxquotaenabled,
+                ),
+                'maxquota' => array(
+                    'title'        => get_string('maxquota', 'artefact.file'),
+                    'type'         => 'bytes',
+                    'defaultvalue' => $maxquota,
+                ),
+            ),
+            'collapsible' => true
+        );
+
         // Require user agreement before uploading files
         // Rework this when/if we provide translatable agreements
         $uploadagreement = get_config_plugin('artefact', 'file', 'uploadagreement');
@@ -1138,9 +1164,18 @@ class ArtefactTypeFile extends ArtefactTypeFileBase {
         );
     }
 
+    public static function validate_config_options($form, $values) {
+        global $USER;
+        if ($values['maxquota'] < $values['defaultquota']) {
+            $form->set_error('maxquota', get_string('maxquotatoolow', 'artefact.file'));
+        }
+    }
+
     public static function save_config_options($values) {
         global $USER;
         set_config_plugin('artefact', 'file', 'defaultquota', $values['defaultquota']);
+        set_config_plugin('artefact', 'file', 'maxquota', $values['maxquota']);
+        set_config_plugin('artefact', 'file', 'maxquotaenabled', $values['maxquotaenabled']);
         set_config_plugin('artefact', 'file', 'profileiconwidth', $values['profileiconwidth']);
         set_config_plugin('artefact', 'file', 'profileiconheight', $values['profileiconheight']);
         set_config_plugin('artefact', 'file', 'uploadagreement', $values['uploadagreement']);