Add backup functionality

Author: Jokeswar

backup/moodle2/backup_choice_settingslib.php

@@ -0,0 +1,26 @@
+<?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/>.
+
+/**
+ * @package   block_vmchecker
+ * @copyright 2022 Mihai Baruta <baruta.mihai99@gmail.com>
+ * @license   https://www.gnu.org/licenses/gpl-3.0.html GNU GPL v3 or later
+ */
+
+ // This activity has not particular settings but the inherited from the generic
+ // backup_activity_task so here there isn't any class definition, like the ones
+ // existing in /backup/moodle2/backup_settingslib.php (activities section)

backup/moodle2/backup_vmchecker_activity_task.class.php

@@ -0,0 +1,36 @@
+<?php
+
+require_once($CFG->dirroot . '/blocks/vmchecker/backup/moodle2/backup_vmchecker_stepslib.php');
+
+/**
+ * vmchecker backup task that provides all the settings and steps to perform one
+ * complete backup of the activity
+ *
+ * @package   block_vmchecker
+ * @copyright 2022 Mihai Baruta <baruta.mihai99@gmail.com>
+ * @license   https://www.gnu.org/licenses/gpl-3.0.html GNU GPL v3 or later
+ */
+class backup_vmchecker_activity_task extends backup_activity_task {
+
+    /**
+     * Define (add) particular settings this activity can have
+     */
+    protected function define_my_settings() {
+        // No particular settings for this activity
+    }
+
+    /**
+     * Define (add) particular steps this activity can have
+     */
+    protected function define_my_steps() {
+        // No particular steps for this activity
+    }
+
+    /**
+     * Code the transformations to perform in the activity in
+     * order to get transportable (encoded) links
+     */
+    static public function encode_content_links($content) {
+        return $content;
+    }
+}

backup/moodle2/backup_vmchecker_stepslib.php

@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * Define all the backup steps that will be used by the backup_vmchecker_activ
+ *
+ * @package   block_vmchecker
+ * @copyright 2022 Mihai Baruta <baruta.mihai99@gmail.com>
+ * @license   https://www.gnu.org/licenses/gpl-3.0.html GNU GPL v3 or laterity_task
+ */
+class backup_vmchecker_activity_structure_step extends backup_activity_structure_step {
+
+    protected function define_structure() {
+        return null;
+    }
+}

block_vmchecker.php

@@ -161,6 +161,40 @@ private function process_submit_form(block_vmchecker\form\submit_form $form) {
         return true;
     }
 
+
+    /**
+     * Loads the assignment of the current block.
+     * @param int $assignmentid
+     * @param int $courseid
+     * @return \assign|null
+     */
+    private function load_assignment(int $assignmentid, int $courseid): \assign|null {
+        if ($assignmentid == null) {
+            return null;
+        }
+
+        $context = null;
+        try {
+            $course_info = get_fast_modinfo($courseid);
+            foreach ($course_info->instances['assign'] as $instance) {
+                if ($instance->instance != $assignmentid) {
+                    continue;
+                }
+
+                $context = \context_module::instance($instance->id);
+                break;
+            }
+        } catch (dml_missing_record_exception | dml_multiple_records_exception $e) {
+            return null;
+        }
+
+        if (!$context) {
+            return null;
+        }
+
+        return new \assign($context, null, null);
+    }
+
     /**
      * Get the HTML content for the block.
      * @return string
@@ -178,27 +212,12 @@ public function get_content() {
 
         $this->content = new stdClass();
 
-        if ($this->config->assignment == null) {
+        $assign = $this->load_assignment($this->config->assignment, $this->page->course->id);
+        if ($assign == null) {
             $this->content->text = get_string('no_assignment_selected', 'block_vmchecker');
             return $this->content;
         }
 
-        try {
-            $course_info = get_fast_modinfo($this->page->course->id);
-            foreach ($course_info->instances['assign'] as $instance) {
-                if ($instance->instance == $this->config->assignment) {
-                    $cm = $instance;
-                    break;
-                }
-            }
-        } catch (dml_missing_record_exception | dml_multiple_records_exception $e) {
-            $this->content->text = get_string('no_assignment_selected', 'block_vmchecker');
-            return $this->content;
-        }
-        $context = \context_module::instance($cm->id);
-
-        $assign = new \assign($context, null, null);
-
         $this->set_title($assign);
         $backendurl = get_config('block_vmchecker', 'backend');
         $api = new \block_vmchecker\backend\api($backendurl);
@@ -316,6 +335,10 @@ public function instance_create() {
     public function instance_config_save($data, $nolongerused = false) {
         global $DB;
 
+        if (!$DB->record_exists('block_vmchecker_options', array('blockinstanceid' => $this->instance->id))) {
+            $this->instance_create();
+        }
+
         parent::instance_config_save($data, $nolongerused);
         $DB->update_record('block_vmchecker_options', [
             'id' => $DB->get_record('block_vmchecker_options', array('blockinstanceid' => $this->instance->id), 'id')->id,