--- /dev/null
+<?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/>.
+
+
+/**
+ * External question API
+ *
+ * @package core_question
+ * @category external
+ * @copyright 2016 Pau Ferrer <pau@moodle.com>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+require_once("$CFG->libdir/externallib.php");
+require_once($CFG->dirroot . '/question/engine/lib.php');
+
+/**
+ * Question external functions
+ *
+ * @package core_question
+ * @category external
+ * @copyright 2016 Pau Ferrer <pau@moodle.com>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @since Moodle 3.1
+ */
+class core_question_external extends external_api {
+
+ /**
+ * Returns description of method parameters
+ *
+ * @return external_function_parameters
+ * @since Moodle 3.1
+ */
+ public static function update_flag_parameters() {
+ return new external_function_parameters(
+ array(
+ 'qubaid' => new external_value(PARAM_INT, 'the question usage id.'),
+ 'questionid' => new external_value(PARAM_INT, 'the question id'),
+ 'qaid' => new external_value(PARAM_INT, 'the question_attempt id'),
+ 'slot' => new external_value(PARAM_INT, 'the slot number within the usage'),
+ 'checksum' => new external_value(PARAM_ALPHANUM, 'computed checksum with the last three arguments and
+ the users username'),
+ 'newstate' => new external_value(PARAM_BOOL, 'the new state of the flag. true = flagged')
+ )
+ );
+ }
+
+ /**
+ * Update the flag state of a question attempt.
+ *
+ * @param int $qubaid the question usage id.
+ * @param int $questionid the question id.
+ * @param int $qaid the question_attempt id.
+ * @param int $slot the slot number within the usage.
+ * @param string $checksum checksum, as computed by {@link get_toggle_checksum()}
+ * corresponding to the last three arguments and the users username.
+ * @param bool $newstate the new state of the flag. true = flagged.
+ * @return array (success infos and fail infos)
+ * @since Moodle 3.1
+ */
+ public static function update_flag($qubaid, $questionid, $qaid, $slot, $checksum, $newstate) {
+ global $CFG, $DB;
+
+ $params = self::validate_parameters(self::update_flag_parameters(),
+ array(
+ 'qubaid' => $qubaid,
+ 'questionid' => $questionid,
+ 'qaid' => $qaid,
+ 'slot' => $slot,
+ 'checksum' => $checksum,
+ 'newstate' => $newstate
+ )
+ );
+
+ $warnings = array();
+
+ // Check user is logged in.
+ require_login(null, false, null, false, true);
+
+ // The checksum will be checked to provide security flagging other users questions.
+ question_flags::update_flag($params['qubaid'], $params['questionid'], $params['qaid'], $params['slot'], $params['checksum'],
+ $params['newstate']);
+
+ $result = array();
+ $result['status'] = true;
+ $result['warnings'] = $warnings;
+ return $result;
+ }
+
+ /**
+ * Returns description of method result value
+ *
+ * @return external_description
+ * @since Moodle 3.1
+ */
+ public static function update_flag_returns() {
+ return new external_single_structure(
+ array(
+ 'status' => new external_value(PARAM_BOOL, 'status: true if success'),
+ 'warnings' => new external_warnings()
+ )
+ );
+ }
+}
--- /dev/null
+<?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/>.
+
+/**
+ * Question external functions tests.
+ *
+ * @package core_question
+ * @category external
+ * @copyright 2016 Pau Ferrer <pau@moodle.com>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @since Moodle 3.1
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+global $CFG;
+
+require_once($CFG->dirroot . '/webservice/tests/helpers.php');
+require_once($CFG->dirroot . '/mod/wiki/lib.php');
+
+/**
+ * Wiki module external functions tests
+ *
+ * @package core_question
+ * @category external
+ * @copyright 2016 Pau Ferrer <pau@moodle.com>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @since Moodle 3.1
+ */
+class core_question_external_testcase extends externallib_advanced_testcase {
+
+ /**
+ * Set up for every test
+ */
+ public function setUp() {
+ global $DB;
+ $this->resetAfterTest();
+
+ // Setup test data.
+ $this->course = $this->getDataGenerator()->create_course();
+ $this->wiki = $this->getDataGenerator()->create_module('wiki', array('course' => $this->course->id));
+
+ // Create users.
+ $this->student = self::getDataGenerator()->create_user();
+
+ // Users enrolments.
+ $this->studentrole = $DB->get_record('role', array('shortname' => 'student'));
+ $this->getDataGenerator()->enrol_user($this->student->id, $this->course->id, $this->studentrole->id, 'manual');
+
+ // Create first page.
+ $this->firstpage = $this->getDataGenerator()->get_plugin_generator('mod_wiki')->create_first_page($this->wiki);
+ }
+
+ /**
+ * Test update question flag
+ */
+ public function test_core_question_update_flag() {
+
+ $question = test_question_maker::make_question('shortanswer');
+ $quba = question_engine::make_questions_usage_by_activity('test', context_system::instance());
+ $slot = $quba->add_question($question);
+ $quba->start_all_questions();
+ $qa = $quba->get_question_attempt($slot);
+
+ $qubaid = $quba->get_id();
+ $questionid = $question->id;
+ $qaid = $qa->id;
+ $checksum = md5($qubaid . "_" . $this->student->secret . "_" . $questionid . "_" . $qaid . "_" . $slot);
+
+ $flag = core_question_external::update_flag($qubaid, $questionid, $qaid, $slot, $checksum, true);
+ $this->assertTrue($flag['status']);
+ }
+}
