Add functionality to download course backups

classes/table/course_backups_table.php

@@ -41,13 +41,14 @@ class course_backups_table extends \table_sql {
     }
 
     public function init() {
-        $this->define_columns(['courseid', 'courseshortname', 'coursefullname', 'backupcreated', 'tools']);
+        $this->define_columns(['courseid', 'courseshortname', 'coursefullname', 'backupcreated', 'download', 'restore']);
         $this->define_headers([
             get_string('course'),
             get_string('shortnamecourse'),
             get_string('fullnamecourse'),
             get_string('backupcreated', 'tool_lifecycle'),
-            get_string('tools', 'tool_lifecycle')]);
+            get_string('download', 'tool_lifecycle'),
+            get_string('restore', 'tool_lifecycle')]);
         $this->setup();
     }
 
@@ -100,11 +101,23 @@ class course_backups_table extends \table_sql {
     }
 
     /**
-     * Render tools column.
+     * Render download column.
+     * @param $row
+     * @return string action buttons for downloading a backup.
+     */
+    public function col_download($row) {
+        return \html_writer::link(
+                new \moodle_url('/admin/tool/lifecycle/downloadbackup.php', array('backupid' => $row->id)),
+                get_string('download', 'tool_lifecycle')
+        );
+    }
+
+    /**
+     * Render restore column.
      * @param $row
      * @return string action buttons for restoring a course.
      */
-    public function col_tools($row) {
+    public function col_restore($row) {
         return \html_writer::link(
             new \moodle_url('/admin/tool/lifecycle/restore.php', array('backupid' => $row->id)),
                 get_string('restore', 'tool_lifecycle')

downloadbackup.php

+<?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/>.
+
+/**
+ * Provides download for backup
+ *
+ * @package tool_lifecycle
+ * @copyright  2019 Justus Dieckmann WWU
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+require_once(__DIR__ . '/../../../config.php');
+require_once($CFG->libdir . '/adminlib.php');
+
+require_login(null, false);
+require_capability('moodle/site:config', context_system::instance());
+
+$backupid = required_param('backupid', PARAM_INT);
+
+$backuprecord = $DB->get_record('tool_lifecycle_backups', array('id' => $backupid), '*', MUST_EXIST);
+$source = $CFG->dataroot . '/lifecycle_backups/' . $backuprecord->backupfile;
+
+if (!file_exists($source)) {
+    throw new \moodle_exception('errorbackupfiledoesnotexist', 'tool_lifecycle', $source);
+}
+
+header("Content-Type: application/zip");
+header("Content-Disposition: attachment; filename=\"backup-$backuprecord->backupfile\"");
+readfile($source);
\ No newline at end of file

lang/en/tool_lifecycle.php

@@ -132,7 +132,8 @@ $string['nocoursestodisplay'] = 'There are currently no courses which require yo
 
 $string['course_backups_list_header'] = 'Course Backups';
 $string['backupcreated'] = 'Created at';
-$string['restore'] = 'restore';
+$string['restore'] = 'Restore';
+$string['download'] = 'Download';
 
 $string['workflownotfound'] = 'Workflow with id {$a} could not be found';