Proyectos de Subversion Moodle

<?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/>.

/**

 * Glossary module external API.

 *

 * @package    mod_glossary

 * @category   external

 * @copyright  2015 Costantino Cito <ccito@cvaconsulting.com>

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 * @since      Moodle 3.1

 */

use core_course\external\helper_for_get_mods_by_courses;

use core_external\external_api;

use core_external\external_files;

use core_external\external_format_value;

use core_external\external_function_parameters;

use core_external\external_multiple_structure;

use core_external\external_single_structure;

use core_external\external_value;

use core_external\external_warnings;

use core_external\util;

defined('MOODLE_INTERNAL') || die();

require_once($CFG->dirroot . '/mod/glossary/lib.php');

/**

 * Glossary module external functions.

 *

 * @package    mod_glossary

 * @category   external

 * @copyright  2015 Costantino Cito <ccito@cvaconsulting.com>

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 * @since      Moodle 3.1

 */

class mod_glossary_external extends external_api {

    /**

     * Get the browse modes from the display format.

     *

     * This returns some of the terms that can be used when reporting a glossary being viewed.

     *

     * @param  string $format The display format of the glossary.

     * @return array Containing some of all of the following: letter, cat, date, author.

     */

    protected static function get_browse_modes_from_display_format($format) {

        global $DB;

        $formats = array();

        $dp = $DB->get_record('glossary_formats', array('name' => $format), '*', IGNORE_MISSING);

        if ($dp) {

            $formats = glossary_get_visible_tabs($dp);

        }

        // Always add 'letter'.

        $modes = array('letter');

        if (in_array('category', $formats)) {

            $modes[] = 'cat';

        }

        if (in_array('date', $formats)) {

            $modes[] = 'date';

        }

        if (in_array('author', $formats)) {

            $modes[] = 'author';

        }

        return $modes;

    }

    /**

     * Get the return value of an entry.

     *

     * @param bool $includecat Whether the definition should include category info.

     * @return external_definition

     */

    protected static function get_entry_return_structure($includecat = false) {

        $params = array(

            'id' => new external_value(PARAM_INT, 'The entry ID'),

            'glossaryid' => new external_value(PARAM_INT, 'The glossary ID'),

            'userid' => new external_value(PARAM_INT, 'Author ID'),

            'userfullname' => new external_value(PARAM_NOTAGS, 'Author full name'),

            'userpictureurl' => new external_value(PARAM_URL, 'Author picture'),

            'concept' => new external_value(PARAM_RAW, 'The concept'),

            'definition' => new external_value(PARAM_RAW, 'The definition'),

            'definitionformat' => new external_format_value('definition'),

            'definitiontrust' => new external_value(PARAM_BOOL, 'The definition trust flag'),

            'definitioninlinefiles' => new external_files('entry definition inline files', VALUE_OPTIONAL),

            'attachment' => new external_value(PARAM_BOOL, 'Whether or not the entry has attachments'),

            'attachments' => new external_files('attachments', VALUE_OPTIONAL),

            'timecreated' => new external_value(PARAM_INT, 'Time created'),

            'timemodified' => new external_value(PARAM_INT, 'Time modified'),

            'teacherentry' => new external_value(PARAM_BOOL, 'The entry was created by a teacher, or equivalent.'),

            'sourceglossaryid' => new external_value(PARAM_INT, 'The source glossary ID'),

            'usedynalink' => new external_value(PARAM_BOOL, 'Whether the concept should be automatically linked'),

            'casesensitive' => new external_value(PARAM_BOOL, 'When true, the matching is case sensitive'),

            'fullmatch' => new external_value(PARAM_BOOL, 'When true, the matching is done on full words only'),

            'approved' => new external_value(PARAM_BOOL, 'Whether the entry was approved'),

            'tags' => new external_multiple_structure(

                \core_tag\external\tag_item_exporter::get_read_structure(), 'Tags', VALUE_OPTIONAL

            ),

        );

        if ($includecat) {

            $params['categoryid'] = new external_value(PARAM_INT, 'The category ID. This may be' .

                ' \''. GLOSSARY_SHOW_NOT_CATEGORISED . '\' when the entry is not categorised', VALUE_DEFAULT,

                GLOSSARY_SHOW_NOT_CATEGORISED);

            $params['categoryname'] = new external_value(PARAM_RAW, 'The category name. May be empty when the entry is' .

                ' not categorised, or the request was limited to one category.', VALUE_DEFAULT, '');

        }

        return new external_single_structure($params);

    }

    /**

     * Fill in an entry object.

     *

     * This adds additional required fields for the external function to return.

     *

     * @param  stdClass $entry   The entry.

     * @param  context  $context The context the entry belongs to.

     * @return void

     */

    protected static function fill_entry_details($entry, $context) {

        global $PAGE;

        $canviewfullnames = has_capability('moodle/site:viewfullnames', $context);

        // Format concept and definition.

        $entry->concept = \core_external\util::format_string($entry->concept, $context);

        [$entry->definition, $entry->definitionformat] = \core_external\util::format_text(

            $entry->definition,

            $entry->definitionformat,

            $context,

            'mod_glossary',

            'entry',

            $entry->id

        );

        // Author details.

        $user = mod_glossary_entry_query_builder::get_user_from_record($entry);

        $userpicture = new user_picture($user);

        $userpicture->size = 1;

        $entry->userfullname = fullname($user, $canviewfullnames);

        $entry->userpictureurl = $userpicture->get_url($PAGE)->out(false);

        // Fetch attachments.

        $entry->attachment = !empty($entry->attachment) ? 1 : 0;

        $entry->attachments = array();

        if ($entry->attachment) {

            $entry->attachments = util::get_area_files($context->id, 'mod_glossary', 'attachment', $entry->id);

        }

        $definitioninlinefiles = util::get_area_files($context->id, 'mod_glossary', 'entry', $entry->id);

        if (!empty($definitioninlinefiles)) {

            $entry->definitioninlinefiles = $definitioninlinefiles;

        }

        $entry->tags = \core_tag\external\util::get_item_tags('mod_glossary', 'glossary_entries', $entry->id);

    }

    /**

     * Validate a glossary via ID.

     *

     * @param  int $id The glossary ID.

     * @return array Contains glossary, context, course and cm.

     */

    public static function validate_glossary($id) {

        global $DB;

        $glossary = $DB->get_record('glossary', array('id' => $id), '*', MUST_EXIST);

        list($course, $cm) = get_course_and_cm_from_instance($glossary, 'glossary');

        $context = context_module::instance($cm->id);

        self::validate_context($context);

        return array($glossary, $context, $course, $cm);

    }

    /**

     * Describes the parameters for get_glossaries_by_courses.

     *

     * @return external_function_parameters

     * @since Moodle 3.1

     */

    public static function get_glossaries_by_courses_parameters() {

        return new external_function_parameters (

            array(

                'courseids' => new external_multiple_structure(

                    new external_value(PARAM_INT, 'course id'),

                    'Array of course IDs', VALUE_DEFAULT, array()

                ),

            )

        );

    }

    /**

     * Returns a list of glossaries in a provided list of courses.

     *

     * If no list is provided all glossaries that the user can view will be returned.

     *

     * @param array $courseids the course IDs.

     * @return array of glossaries

     * @since Moodle 3.1

     */

    public static function get_glossaries_by_courses($courseids = array()) {

        global $CFG;

        $params = self::validate_parameters(self::get_glossaries_by_courses_parameters(), array('courseids' => $courseids));

        $warnings = array();

        $courses = array();

        $courseids = $params['courseids'];

        if (empty($courseids)) {

            $courses = enrol_get_my_courses();

            $courseids = array_keys($courses);

        }

        // Array to store the glossaries to return.

        $glossaries = array();

        $modes = array();

        // Ensure there are courseids to loop through.

        if (!empty($courseids)) {

            list($courses, $warnings) = util::validate_courses($courseids, $courses);

            // Get the glossaries in these courses, this function checks users visibility permissions.

            $glossaries = get_all_instances_in_courses('glossary', $courses);

            foreach ($glossaries as $glossary) {

                $context = context_module::instance($glossary->coursemodule);

                helper_for_get_mods_by_courses::format_name_and_intro($glossary, 'mod_glossary');

                // Make sure we have a number of entries per page.

                if (!$glossary->entbypage) {

                    $glossary->entbypage = $CFG->glossary_entbypage;

                }

                // Add the list of browsing modes.

                if (!isset($modes[$glossary->displayformat])) {

                    $modes[$glossary->displayformat] = self::get_browse_modes_from_display_format($glossary->displayformat);

                }

                $glossary->browsemodes = $modes[$glossary->displayformat];

                $glossary->canaddentry = has_capability('mod/glossary:write', $context) ? 1 : 0;

            }

        }

        $result = array();

        $result['glossaries'] = $glossaries;

        $result['warnings'] = $warnings;

        return $result;

    }

    /**

     * Describes the get_glossaries_by_courses return value.

     *

     * @return external_single_structure

     * @since Moodle 3.1

     */

    public static function get_glossaries_by_courses_returns() {

        return new external_single_structure(array(

            'glossaries' => new external_multiple_structure(

                new external_single_structure(array_merge(

                    helper_for_get_mods_by_courses::standard_coursemodule_elements_returns(),

                    [

                    'allowduplicatedentries' => new external_value(PARAM_INT, 'If enabled, multiple entries can have the' .

                        ' same concept name'),

                    'displayformat' => new external_value(PARAM_TEXT, 'Display format type'),

                    'mainglossary' => new external_value(PARAM_INT, 'If enabled this glossary is a main glossary.'),

                    'showspecial' => new external_value(PARAM_INT, 'If enabled, participants can browse the glossary by' .

                        ' special characters, such as @ and #'),

                    'showalphabet' => new external_value(PARAM_INT, 'If enabled, participants can browse the glossary by' .

                        ' letters of the alphabet'),

                    'showall' => new external_value(PARAM_INT, 'If enabled, participants can browse all entries at once'),

                    'allowcomments' => new external_value(PARAM_INT, 'If enabled, all participants with permission to' .

                        ' create comments will be able to add comments to glossary entries'),

                    'allowprintview' => new external_value(PARAM_INT, 'If enabled, students are provided with a link to a' .

                        ' printer-friendly version of the glossary. The link is always available to teachers'),

                    'usedynalink' => new external_value(PARAM_INT, 'If site-wide glossary auto-linking has been enabled' .

                        ' by an administrator and this checkbox is ticked, the entry will be automatically linked' .

                        ' wherever the concept words and phrases appear throughout the rest of the course.'),

                    'defaultapproval' => new external_value(PARAM_INT, 'If set to no, entries require approving by a' .

                        ' teacher before they are viewable by everyone.'),

                    'approvaldisplayformat' => new external_value(PARAM_TEXT, 'When approving glossary items you may wish' .

                        ' to use a different display format'),

                    'globalglossary' => new external_value(PARAM_INT, ''),

                    'entbypage' => new external_value(PARAM_INT, 'Entries shown per page'),

                    'editalways' => new external_value(PARAM_INT, 'Always allow editing'),

                    'rsstype' => new external_value(PARAM_INT, 'To enable the RSS feed for this activity, select either' .

                        ' concepts with author or concepts without author to be included in the feed'),

                    'rssarticles' => new external_value(PARAM_INT, 'This setting specifies the number of glossary entry' .

                        ' concepts to include in the RSS feed. Between 5 and 20 generally acceptable'),

                    'assessed' => new external_value(PARAM_INT, 'Aggregate type'),

                    'assesstimestart' => new external_value(PARAM_INT, 'Restrict rating to items created after this'),

                    'assesstimefinish' => new external_value(PARAM_INT, 'Restrict rating to items created before this'),

                    'scale' => new external_value(PARAM_INT, 'Scale ID'),

                    'timecreated' => new external_value(PARAM_INT, 'Time created'),

                    'timemodified' => new external_value(PARAM_INT, 'Time modified'),

                    'completionentries' => new external_value(PARAM_INT, 'Number of entries to complete'),

                    'browsemodes' => new external_multiple_structure(

                        new external_value(PARAM_ALPHA, 'Modes of browsing allowed')

                    ),

                    'canaddentry' => new external_value(PARAM_INT, 'Whether the user can add a new entry', VALUE_OPTIONAL),

                    ]

                ), 'Glossaries')

            ),

            'warnings' => new external_warnings())

        );

    }

    /**

     * Returns the description of the external function parameters.

     *

     * @return external_function_parameters

     * @since Moodle 3.1

     */

    public static function view_glossary_parameters() {

        return new external_function_parameters(array(

            'id' => new external_value(PARAM_INT, 'Glossary instance ID'),

            'mode' => new external_value(PARAM_ALPHA, 'The mode in which the glossary is viewed'),

        ));

    }

    /**

     * Notify that the course module was viewed.

     *

     * @param int $id The glossary instance ID.

     * @param string $mode The view mode.

     * @return array of warnings and status result

     * @since Moodle 3.1

     * @throws moodle_exception

     */

    public static function view_glossary($id, $mode) {

        $params = self::validate_parameters(self::view_glossary_parameters(), array(

            'id' => $id,

            'mode' => $mode

        ));

        $id = $params['id'];

        $mode = $params['mode'];

        $warnings = array();

        // Get and validate the glossary.

        list($glossary, $context, $course, $cm) = self::validate_glossary($id);

        // Trigger module viewed event.

        glossary_view($glossary, $course, $cm, $context, $mode);

        return array(

            'status' => true,

            'warnings' => $warnings

        );

    }

    /**

     * Returns the description of the external function return value.

     *

     * @return \core_external\external_description

     * @since Moodle 3.1

     */

    public static function view_glossary_returns() {

        return new external_single_structure(array(

            'status' => new external_value(PARAM_BOOL, 'True on success'),

            'warnings' => new external_warnings()

        ));

    }

    /**

     * Returns the description of the external function parameters.

     *

     * @return external_function_parameters

     * @since Moodle 3.1

     */

    public static function view_entry_parameters() {

        return new external_function_parameters(array(

            'id' => new external_value(PARAM_INT, 'Glossary entry ID'),

        ));

    }

    /**

     * Notify that the entry was viewed.

     *

     * @param int $id The entry ID.

     * @return array of warnings and status result

     * @since Moodle 3.1

     * @throws moodle_exception

     * @throws invalid_parameter_exception

     */

    public static function view_entry($id) {

        global $DB, $USER;

        $params = self::validate_parameters(self::view_entry_parameters(), array('id' => $id));

        $id = $params['id'];

        $warnings = array();

        // Get and validate the glossary.

        $entry = $DB->get_record('glossary_entries', array('id' => $id), '*', MUST_EXIST);

        list($glossary, $context, $course, $cm) = self::validate_glossary($entry->glossaryid);

        if (!glossary_can_view_entry($entry, $cm)) {

            throw new invalid_parameter_exception('invalidentry');

        }

        // Trigger view.

        glossary_entry_view($entry, $context);

        return array(

            'status' => true,

            'warnings' => $warnings

        );

    }

    /**

     * Returns the description of the external function return value.

     *

     * @return \core_external\external_description

     * @since Moodle 3.1

     */

    public static function view_entry_returns() {

        return new external_single_structure(array(

            'status' => new external_value(PARAM_BOOL, 'True on success'),

            'warnings' => new external_warnings()

        ));

    }

    /**

     * Returns the description of the external function parameters.

     *

     * @return external_function_parameters

     * @since Moodle 3.1

     */

    public static function get_entries_by_letter_parameters() {

        return new external_function_parameters(array(

            'id' => new external_value(PARAM_INT, 'Glossary entry ID'),

            'letter' => new external_value(PARAM_ALPHA, 'A letter, or either keywords: \'ALL\' or \'SPECIAL\'.'),

            'from' => new external_value(PARAM_INT, 'Start returning records from here', VALUE_DEFAULT, 0),

            'limit' => new external_value(PARAM_INT, 'Number of records to return', VALUE_DEFAULT, 20),

            'options' => new external_single_structure(array(

                'includenotapproved' => new external_value(PARAM_BOOL, 'When false, includes the non-approved entries created by' .

                    ' the user. When true, also includes the ones that the user has the permission to approve.', VALUE_DEFAULT, 0)

            ), 'An array of options', VALUE_DEFAULT, array())

        ));

    }

    /**

     * Browse a glossary entries by letter.

     *

     * @param int $id The glossary ID.

     * @param string $letter A letter, or a special keyword.

     * @param int $from Start returning records from here.

     * @param int $limit Number of records to return.

     * @param array $options Array of options.

     * @return array Containing count, entries and warnings.

     * @since Moodle 3.1

     * @throws moodle_exception

     * @throws invalid_parameter_exception

     */

    public static function get_entries_by_letter($id, $letter, $from, $limit, $options) {

        $params = self::validate_parameters(self::get_entries_by_letter_parameters(), array(

            'id' => $id,

            'letter' => $letter,

            'from' => $from,

            'limit' => $limit,

            'options' => $options,

        ));

        $id = $params['id'];

        $letter = $params['letter'];

        $from = $params['from'];

        $limit = $params['limit'];

        $options = $params['options'];

        $warnings = array();

        // Get and validate the glossary.

        list($glossary, $context) = self::validate_glossary($id);

        // Validate the mode.

        $modes = self::get_browse_modes_from_display_format($glossary->displayformat);

        if (!in_array('letter', $modes)) {

            throw new invalid_parameter_exception('invalidbrowsemode');

        }

        $entries = array();

        list($records, $count) = glossary_get_entries_by_letter($glossary, $context, $letter, $from, $limit, $options);

        foreach ($records as $key => $record) {

            self::fill_entry_details($record, $context);

            $entries[] = $record;

        }

        return array(

            'count' => $count,

            'entries' => $entries,

            'ratinginfo' => \core_rating\external\util::get_rating_info($glossary, $context, 'mod_glossary', 'entry', $entries),

            'warnings' => $warnings

        );

    }

    /**

     * Returns the description of the external function return value.

     *

     * @return \core_external\external_description

     * @since Moodle 3.1

     */

    public static function get_entries_by_letter_returns() {

        return new external_single_structure(array(

            'count' => new external_value(PARAM_INT, 'The total number of records matching the request.'),

            'entries' => new external_multiple_structure(

                self::get_entry_return_structure()

            ),

            'ratinginfo' => \core_rating\external\util::external_ratings_structure(),

            'warnings' => new external_warnings()

        ));

    }

    /**

     * Returns the description of the external function parameters.

     *

     * @return external_function_parameters

     * @since Moodle 3.1

     */

    public static function get_entries_by_date_parameters() {

        return new external_function_parameters(array(

            'id' => new external_value(PARAM_INT, 'Glossary entry ID'),

            'order' => new external_value(PARAM_ALPHA, 'Order the records by: \'CREATION\' or \'UPDATE\'.',

                VALUE_DEFAULT, 'UPDATE'),

            'sort' => new external_value(PARAM_ALPHA, 'The direction of the order: \'ASC\' or \'DESC\'', VALUE_DEFAULT, 'DESC'),

            'from' => new external_value(PARAM_INT, 'Start returning records from here', VALUE_DEFAULT, 0),

            'limit' => new external_value(PARAM_INT, 'Number of records to return', VALUE_DEFAULT, 20),

            'options' => new external_single_structure(array(

                'includenotapproved' => new external_value(PARAM_BOOL, 'When false, includes the non-approved entries created by' .

                    ' the user. When true, also includes the ones that the user has the permission to approve.', VALUE_DEFAULT, 0)

            ), 'An array of options', VALUE_DEFAULT, array())

        ));

    }

    /**

     * Browse a glossary entries by date.

     *

     * @param int $id The glossary ID.

     * @param string $order The way to order the records.

     * @param string $sort The direction of the order.

     * @param int $from Start returning records from here.

     * @param int $limit Number of records to return.

     * @param array $options Array of options.

     * @return array Containing count, entries and warnings.

     * @since Moodle 3.1

     * @throws moodle_exception

     * @throws invalid_parameter_exception

     */

    public static function get_entries_by_date($id, $order, $sort, $from, $limit, $options) {

        $params = self::validate_parameters(self::get_entries_by_date_parameters(), array(

            'id' => $id,

            'order' => core_text::strtoupper($order),

            'sort' => core_text::strtoupper($sort),

            'from' => $from,

            'limit' => $limit,

            'options' => $options,

        ));

        $id = $params['id'];

        $order = $params['order'];

        $sort = $params['sort'];

        $from = $params['from'];

        $limit = $params['limit'];

        $options = $params['options'];

        $warnings = array();

        if (!in_array($order, array('CREATION', 'UPDATE'))) {

            throw new invalid_parameter_exception('invalidorder');

        } else if (!in_array($sort, array('ASC', 'DESC'))) {

            throw new invalid_parameter_exception('invalidsort');

        }

        // Get and validate the glossary.

        list($glossary, $context) = self::validate_glossary($id);

        // Validate the mode.

        $modes = self::get_browse_modes_from_display_format($glossary->displayformat);

        if (!in_array('date', $modes)) {

            throw new invalid_parameter_exception('invalidbrowsemode');

        }

        $entries = array();

        list($records, $count) = glossary_get_entries_by_date($glossary, $context, $order, $sort, $from, $limit, $options);

        foreach ($records as $key => $record) {

            self::fill_entry_details($record, $context);

            $entries[] = $record;

        }

        return array(

            'count' => $count,

            'entries' => $entries,

            'ratinginfo' => \core_rating\external\util::get_rating_info($glossary, $context, 'mod_glossary', 'entry', $entries),

            'warnings' => $warnings

        );

    }

    /**

     * Returns the description of the external function return value.

     *

     * @return \core_external\external_description

     * @since Moodle 3.1

     */

    public static function get_entries_by_date_returns() {

        return new external_single_structure(array(

            'count' => new external_value(PARAM_INT, 'The total number of records matching the request.'),

            'entries' => new external_multiple_structure(

                self::get_entry_return_structure()

            ),

            'ratinginfo' => \core_rating\external\util::external_ratings_structure(),

            'warnings' => new external_warnings()

        ));

    }

    /**

     * Returns the description of the external function parameters.

     *

     * @return external_function_parameters

     * @since Moodle 3.1

     */

    public static function get_categories_parameters() {

        return new external_function_parameters(array(

            'id' => new external_value(PARAM_INT, 'The glossary ID'),

            'from' => new external_value(PARAM_INT, 'Start returning records from here', VALUE_DEFAULT, 0),

            'limit' => new external_value(PARAM_INT, 'Number of records to return', VALUE_DEFAULT, 20)

        ));

    }

    /**

     * Get the categories of a glossary.

     *

     * @param int $id The glossary ID.

     * @param int $from Start returning records from here.

     * @param int $limit Number of records to return.

     * @return array Containing count, categories and warnings.

     * @since Moodle 3.1

     * @throws moodle_exception

     */

    public static function get_categories($id, $from, $limit) {

        $params = self::validate_parameters(self::get_categories_parameters(), array(

            'id' => $id,

            'from' => $from,

            'limit' => $limit

        ));

        $id = $params['id'];

        $from = $params['from'];

        $limit = $params['limit'];

        $warnings = array();

        // Get and validate the glossary.

        list($glossary, $context) = self::validate_glossary($id);

        // Fetch the categories.

        $categories = array();

        list($records, $count) = glossary_get_categories($glossary, $from, $limit);

        foreach ($records as $category) {

            $category->name = \core_external\util::format_string($category->name, $context);

            $categories[] = $category;

        }

        return array(

            'count' => $count,

            'categories' => $categories,

            'warnings' => array(),

        );

    }

    /**

     * Returns the description of the external function return value.

     *

     * @return \core_external\external_description

     * @since Moodle 3.1

     */

    public static function get_categories_returns() {

        return new external_single_structure(array(

            'count' => new external_value(PARAM_INT, 'The total number of records.'),

            'categories' => new external_multiple_structure(

                new external_single_structure(array(

                    'id' => new external_value(PARAM_INT, 'The category ID'),

                    'glossaryid' => new external_value(PARAM_INT, 'The glossary ID'),

                    'name' => new external_value(PARAM_RAW, 'The name of the category'),

                    'usedynalink' => new external_value(PARAM_BOOL, 'Whether the category is automatically linked'),

                ))

            ),

            'warnings' => new external_warnings()

        ));

    }

    /**

     * Returns the description of the external function parameters.

     *

     * @return external_function_parameters

     * @since Moodle 3.1

     */

    public static function get_entries_by_category_parameters() {

        return new external_function_parameters(array(

            'id' => new external_value(PARAM_INT, 'The glossary ID.'),

            'categoryid' => new external_value(PARAM_INT, 'The category ID. Use \'' . GLOSSARY_SHOW_ALL_CATEGORIES . '\' for all' .

                ' categories, or \'' . GLOSSARY_SHOW_NOT_CATEGORISED . '\' for uncategorised entries.'),

            'from' => new external_value(PARAM_INT, 'Start returning records from here', VALUE_DEFAULT, 0),

            'limit' => new external_value(PARAM_INT, 'Number of records to return', VALUE_DEFAULT, 20),

            'options' => new external_single_structure(array(

                'includenotapproved' => new external_value(PARAM_BOOL, 'When false, includes the non-approved entries created by' .

                    ' the user. When true, also includes the ones that the user has the permission to approve.', VALUE_DEFAULT, 0)

            ), 'An array of options', VALUE_DEFAULT, array())

        ));

    }

    /**

     * Browse a glossary entries by category.

     *

     * @param int $id The glossary ID.

     * @param int $categoryid The category ID.

     * @param int $from Start returning records from here.

     * @param int $limit Number of records to return.

     * @param array $options Array of options.

     * @return array Containing count, entries and warnings.

     * @since Moodle 3.1

     * @throws moodle_exception

     * @throws invalid_parameter_exception

     */

    public static function get_entries_by_category($id, $categoryid, $from, $limit, $options) {

        global $DB;

        $params = self::validate_parameters(self::get_entries_by_category_parameters(), array(

            'id' => $id,

            'categoryid' => $categoryid,

            'from' => $from,

            'limit' => $limit,

            'options' => $options,

        ));

        $id = $params['id'];

        $categoryid = $params['categoryid'];

        $from = $params['from'];

        $limit = $params['limit'];

        $options = $params['options'];

        $warnings = array();

        // Get and validate the glossary.

        list($glossary, $context) = self::validate_glossary($id);

        // Validate the mode.

        $modes = self::get_browse_modes_from_display_format($glossary->displayformat);

        if (!in_array('cat', $modes)) {

            throw new invalid_parameter_exception('invalidbrowsemode');

        }

        // Validate the category.

        if (in_array($categoryid, array(GLOSSARY_SHOW_ALL_CATEGORIES, GLOSSARY_SHOW_NOT_CATEGORISED))) {

            // All good.

        } else if (!$DB->record_exists('glossary_categories', array('id' => $categoryid, 'glossaryid' => $id))) {

            throw new invalid_parameter_exception('invalidcategory');

        }

        // Fetching the entries.

        $entries = array();

        list($records, $count) = glossary_get_entries_by_category($glossary, $context, $categoryid, $from, $limit, $options);

        foreach ($records as $key => $record) {

            self::fill_entry_details($record, $context);

            if ($record->categoryid === null) {

                $record->categoryid = GLOSSARY_SHOW_NOT_CATEGORISED;

            }

            if (isset($record->categoryname)) {

                $record->categoryname = \core_external\util::format_string($record->categoryname, $context);

            }

            $entries[] = $record;

        }

        return array(

            'count' => $count,

            'entries' => $entries,

            'ratinginfo' => \core_rating\external\util::get_rating_info($glossary, $context, 'mod_glossary', 'entry', $entries),

            'warnings' => $warnings

        );

    }

    /**

     * Returns the description of the external function return value.

     *

     * @return \core_external\external_description

     * @since Moodle 3.1

     */

    public static function get_entries_by_category_returns() {

        return new external_single_structure(array(

            'count' => new external_value(PARAM_INT, 'The total number of records matching the request.'),

            'entries' => new external_multiple_structure(

                self::get_entry_return_structure(true)

            ),

            'ratinginfo' => \core_rating\external\util::external_ratings_structure(),

            'warnings' => new external_warnings()

        ));

    }

    /**

     * Returns the description of the external function parameters.

     *

     * @return external_function_parameters

     * @since Moodle 3.1

     */

    public static function get_authors_parameters() {

        return new external_function_parameters(array(

            'id' => new external_value(PARAM_INT, 'Glossary entry ID'),

            'from' => new external_value(PARAM_INT, 'Start returning records from here', VALUE_DEFAULT, 0),

            'limit' => new external_value(PARAM_INT, 'Number of records to return', VALUE_DEFAULT, 20),

            'options' => new external_single_structure(array(

                'includenotapproved' => new external_value(PARAM_BOOL, 'When false, includes self even if all of their entries' .

                    ' require approval. When true, also includes authors only having entries pending approval.', VALUE_DEFAULT, 0)

            ), 'An array of options', VALUE_DEFAULT, array())

        ));

    }

    /**

     * Get the authors of a glossary.

     *

     * @param int $id The glossary ID.

     * @param int $from Start returning records from here.

     * @param int $limit Number of records to return.

     * @param array $options Array of options.

     * @return array Containing count, authors and warnings.

     * @since Moodle 3.1

     * @throws moodle_exception

     */

    public static function get_authors($id, $from, $limit, $options) {

        global $PAGE;

        $params = self::validate_parameters(self::get_authors_parameters(), array(

            'id' => $id,

            'from' => $from,

            'limit' => $limit,

            'options' => $options,

        ));

        $id = $params['id'];

        $from = $params['from'];

        $limit = $params['limit'];

        $options = $params['options'];

        $warnings = array();

        // Get and validate the glossary.

        list($glossary, $context) = self::validate_glossary($id);

        // Fetching the entries.

        list($users, $count) = glossary_get_authors($glossary, $context, $limit, $from, $options);

        $canviewfullnames = has_capability('moodle/site:viewfullnames', $context);

        foreach ($users as $user) {

            $userpicture = new user_picture($user);

            $userpicture->size = 1;

            $author = new stdClass();

            $author->id = $user->id;

            $author->fullname = fullname($user, $canviewfullnames);

            $author->pictureurl = $userpicture->get_url($PAGE)->out(false);

            $authors[] = $author;

        }

        $users->close();

        return array(

            'count' => $count,

            'authors' => $authors,

            'warnings' => array(),

        );

    }

    /**

     * Returns the description of the external function return value.

     *

     * @return \core_external\external_description

     * @since Moodle 3.1

     */

    public static function get_authors_returns() {

        return new external_single_structure(array(

            'count' => new external_value(PARAM_INT, 'The total number of records.'),

            'authors' => new external_multiple_structure(

                new external_single_structure(array(

                    'id' => new external_value(PARAM_INT, 'The user ID'),

                    'fullname' => new external_value(PARAM_NOTAGS, 'The fullname'),

                    'pictureurl' => new external_value(PARAM_URL, 'The picture URL'),

                ))

            ),

            'warnings' => new external_warnings()

        ));

    }

    /**

     * Returns the description of the external function parameters.

     *

     * @return external_function_parameters

     * @since Moodle 3.1

     */

    public static function get_entries_by_author_parameters() {

        return new external_function_parameters(array(

            'id' => new external_value(PARAM_INT, 'Glossary entry ID'),

            'letter' => new external_value(PARAM_ALPHA, 'First letter of firstname or lastname, or either keywords:'

                . ' \'ALL\' or \'SPECIAL\'.'),

            'field' => new external_value(PARAM_ALPHA, 'Search and order using: \'FIRSTNAME\' or \'LASTNAME\'', VALUE_DEFAULT,

                'LASTNAME'),

            'sort' => new external_value(PARAM_ALPHA, 'The direction of the order: \'ASC\' or \'DESC\'', VALUE_DEFAULT, 'ASC'),

            'from' => new external_value(PARAM_INT, 'Start returning records from here', VALUE_DEFAULT, 0),

            'limit' => new external_value(PARAM_INT, 'Number of records to return', VALUE_DEFAULT, 20),

            'options' => new external_single_structure(array(

                'includenotapproved' => new external_value(PARAM_BOOL, 'When false, includes the non-approved entries created by' .

                    ' the user. When true, also includes the ones that the user has the permission to approve.', VALUE_DEFAULT, 0)

            ), 'An array of options', VALUE_DEFAULT, array())

        ));

    }

    /**

     * Browse a glossary entries by author.

     *

     * @param int $id The glossary ID.

     * @param string $letter A letter, or a special keyword.

     * @param string $field The field to search from.

     * @param string $sort The direction of the order.

     * @param int $from Start returning records from here.

     * @param int $limit Number of records to return.

     * @param array $options Array of options.

     * @return array Containing count, entries and warnings.

     * @since Moodle 3.1

     * @throws moodle_exception

     * @throws invalid_parameter_exception

     */

    public static function get_entries_by_author($id, $letter, $field, $sort, $from, $limit, $options) {

        $params = self::validate_parameters(self::get_entries_by_author_parameters(), array(

            'id' => $id,

            'letter' => $letter,

            'field' => core_text::strtoupper($field),

            'sort' => core_text::strtoupper($sort),

            'from' => $from,

            'limit' => $limit,

            'options' => $options,

        ));

        $id = $params['id'];

        $letter = $params['letter'];

        $field = $params['field'];

        $sort = $params['sort'];

        $from = $params['from'];

        $limit = $params['limit'];

        $options = $params['options'];

        $warnings = array();

        if (!in_array($field, array('FIRSTNAME', 'LASTNAME'))) {

            throw new invalid_parameter_exception('invalidfield');

        } else if (!in_array($sort, array('ASC', 'DESC'))) {

            throw new invalid_parameter_exception('invalidsort');

        }

        // Get and validate the glossary.

        list($glossary, $context) = self::validate_glossary($id);

        // Validate the mode.

        $modes = self::get_browse_modes_from_display_format($glossary->displayformat);

        if (!in_array('author', $modes)) {

            throw new invalid_parameter_exception('invalidbrowsemode');

        }

        // Fetching the entries.

        $entries = array();

        list($records, $count) = glossary_get_entries_by_author($glossary, $context, $letter, $field, $sort, $from, $limit,

            $options);

        foreach ($records as $key => $record) {

            self::fill_entry_details($record, $context);

            $entries[] = $record;

        }

        return array(

            'count' => $count,

            'entries' => $entries,

            'ratinginfo' => \core_rating\external\util::get_rating_info($glossary, $context, 'mod_glossary', 'entry', $entries),

            'warnings' => $warnings

        );

    }

    /**

     * Returns the description of the external function return value.

     *

     * @return \core_external\external_description

     * @since Moodle 3.1

     */

    public static function get_entries_by_author_returns() {

        return new external_single_structure(array(

            'count' => new external_value(PARAM_INT, 'The total number of records matching the request.'),

            'entries' => new external_multiple_structure(

                self::get_entry_return_structure()

            ),

            'ratinginfo' => \core_rating\external\util::external_ratings_structure(),

            'warnings' => new external_warnings()

        ));

    }

    /**

     * Returns the description of the external function parameters.

     *

     * @return external_function_parameters