From 37d7820816fa96edd4f5738064b3f3bb930bda99 Mon Sep 17 00:00:00 2001
From: Ilya Tregubov <ilyatregubov@catalyst-au.net>
Date: Tue, 24 Mar 2020 09:36:57 +1100
Subject: [PATCH] MDL-68203 restore: Decode quiz links when restore into
 existing course

                   or duplicating.
---
 backup/moodle2/restore_qtype_plugin.class.php | 14 +++
 .../tests/quiz_restore_decode_links_test.php  | 97 +++++++++++++++++++
 2 files changed, 111 insertions(+)
 create mode 100644 backup/tests/quiz_restore_decode_links_test.php

diff --git a/backup/moodle2/restore_qtype_plugin.class.php b/backup/moodle2/restore_qtype_plugin.class.php
index 7520aa31910..49bd8a18e30 100644
--- a/backup/moodle2/restore_qtype_plugin.class.php
+++ b/backup/moodle2/restore_qtype_plugin.class.php
@@ -175,6 +175,20 @@ abstract class restore_qtype_plugin extends restore_plugin {
                 }
             }
 
+            $rules = restore_course_task::define_decode_rules();
+            $rulesactivity = restore_quiz_activity_task::define_decode_rules();
+            $rules = array_merge($rules, $rulesactivity);
+
+            $decoder = $this->task->get_decoder();
+            foreach ($rules as $rule) {
+                $decoder->add_rule($rule);
+            }
+
+            $contentdecoded = $decoder->decode_content($data->answertext);
+            if ($contentdecoded) {
+                $data->answertext = $contentdecoded;
+            }
+
             if (!isset($this->questionanswercache[$data->answertext])) {
                 // If we haven't found the matching answer, something has gone really wrong, the question in the DB
                 // is missing answers, throw an exception.
diff --git a/backup/tests/quiz_restore_decode_links_test.php b/backup/tests/quiz_restore_decode_links_test.php
new file mode 100644
index 00000000000..19a142d4077
--- /dev/null
+++ b/backup/tests/quiz_restore_decode_links_test.php
@@ -0,0 +1,97 @@
+<?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/>.
+
+/**
+ * Decode links quiz restore tests.
+ *
+ * @package    core_backup
+ * @copyright  2020 Ilya Tregubov <mattp@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+// Include all the needed stuff.
+global $CFG;
+require_once($CFG->dirroot . '/course/lib.php');
+require_once($CFG->dirroot . '/backup/util/includes/restore_includes.php');
+require_once($CFG->dirroot . '/question/engine/tests/helpers.php');
+
+/**
+ * restore_decode tests (both rule and content)
+ */
+class restore_quiz_decode_testcase extends \core_privacy\tests\provider_testcase {
+
+    /**
+     * Test restore_decode_rule class
+     */
+    public function test_restore_quiz_decode_links() {
+        global $DB, $CFG, $USER;
+
+        $this->resetAfterTest(true);
+        $this->setAdminUser();
+
+        $generator = $this->getDataGenerator();
+        $course = $generator->create_course(
+            array('format' => 'topics', 'numsections' => 3,
+                'enablecompletion' => COMPLETION_ENABLED),
+            array('createsections' => true));
+        $quiz = $generator->create_module('quiz', array(
+            'course' => $course->id));
+
+        // Create questions.
+
+        $questiongenerator = $this->getDataGenerator()->get_plugin_generator('core_question');
+        $context = context_course::instance($course->id);
+        $cat = $questiongenerator->create_question_category(array('contextid' => $context->id));
+        $question = $questiongenerator->create_question('multichoice', null, array('category' => $cat->id));
+
+        // Add to the quiz.
+        quiz_add_quiz_question($question->id, $quiz);
+
+        $questiondata = question_bank::load_question_data($question->id);
+
+        $firstanswer = array_shift($questiondata->options->answers);
+        $DB->set_field('question_answers', 'answer', $CFG->wwwroot . '/course/view.php?id=' . $course->id,
+            ['id' => $firstanswer->id]);
+
+        $secondanswer = array_shift($questiondata->options->answers);
+        $DB->set_field('question_answers', 'answer', $CFG->wwwroot . '/mod/quiz/view.php?id=' . $quiz->cmid,
+            ['id' => $secondanswer->id]);
+
+        $thirdanswer = array_shift($questiondata->options->answers);
+        $DB->set_field('question_answers', 'answer', $CFG->wwwroot . '/grade/report/index.php?id=' . $quiz->cmid,
+            ['id' => $thirdanswer->id]);
+
+        $fourthanswer = array_shift($questiondata->options->answers);
+        $DB->set_field('question_answers', 'answer', $CFG->wwwroot . '/mod/quiz/index.php?id=' . $quiz->cmid,
+            ['id' => $fourthanswer->id]);
+
+        $newcm = duplicate_module($course, get_fast_modinfo($course)->get_cm($quiz->cmid));
+
+        $sql = "SELECT qa.answer
+                  FROM {quiz} q
+             LEFT JOIN {quiz_slots} qs ON qs.quizid = q.id
+             LEFT JOIN {question_answers} qa ON qa.question = qs.questionid
+                 WHERE q.id = :quizid";
+        $params = array('quizid' => $newcm->instance);
+        $answers = $DB->get_fieldset_sql($sql, $params);
+        $this->assertEquals($CFG->wwwroot . '/course/view.php?id=' . $course->id, $answers[0]);
+        $this->assertEquals($CFG->wwwroot . '/mod/quiz/view.php?id=' . $quiz->cmid, $answers[1]);
+        $this->assertEquals($CFG->wwwroot . '/grade/report/index.php?id=' . $quiz->cmid, $answers[2]);
+        $this->assertEquals($CFG->wwwroot . '/mod/quiz/index.php?id=' . $quiz->cmid, $answers[3]);
+    }
+}