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Current File : /var/www/html/formation/lib/external/externallib.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/>.

use core_external\external_api;
use core_external\external_function_parameters;
use core_external\external_multiple_structure;
use core_external\external_single_structure;
use core_external\external_value;

/**
 * Web service related functions
 *
 * @package    core
 * @category   external
 * @copyright  2012 Jerome Mouneyrac <jerome@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @since Moodle 2.4
 */
class core_external extends external_api {


    /**
     * Format the received string parameters to be sent to the core get_string() function.
     *
     * @param array $stringparams
     * @return object|string
     * @since Moodle 2.4
     */
    public static function format_string_parameters($stringparams) {
        // Check if there are some string params.
        $strparams = new stdClass();
        if (!empty($stringparams)) {
            // There is only one string parameter.
            if (count($stringparams) == 1) {
                $stringparam = array_pop($stringparams);
                if (isset($stringparam['name'])) {
                    $strparams->{$stringparam['name']} = $stringparam['value'];
                } else {
                    // It is a not named string parameter.
                    $strparams = $stringparam['value'];
                }
            } else {
                // There are more than one parameter.
                foreach ($stringparams as $stringparam) {

                    // If a parameter is unnamed throw an exception
                    // unnamed param is only possible if one only param is sent.
                    if (empty($stringparam['name'])) {
                        throw new moodle_exception('unnamedstringparam', 'webservice');
                    }

                    $strparams->{$stringparam['name']} = $stringparam['value'];
                }
            }
        }
        return $strparams;
    }

    /**
     * Returns description of get_string parameters
     *
     * @return external_function_parameters
     * @since Moodle 2.4
     */
    public static function get_string_parameters() {
        return new external_function_parameters(
            array('stringid' => new external_value(PARAM_STRINGID, 'string identifier'),
                  'component' => new external_value(PARAM_COMPONENT,'component', VALUE_DEFAULT, 'moodle'),
                  'lang' => new external_value(PARAM_LANG, 'lang', VALUE_DEFAULT, null),
                  'stringparams' => new external_multiple_structure (
                      new external_single_structure(array(
                          'name' => new external_value(PARAM_ALPHANUMEXT, 'param name
                            - if the string expect only one $a parameter then don\'t send this field, just send the value.', VALUE_OPTIONAL),
                          'value' => new external_value(PARAM_RAW,'param value'))),
                          'the definition of a string param (i.e. {$a->name})', VALUE_DEFAULT, array()
                   )
            )
        );
    }

    /**
     * Return a core get_string() call
     *
     * @param string $identifier string identifier
     * @param string $component string component
     * @param array $stringparams the string params
     * @return string
     * @since Moodle 2.4
     */
    public static function get_string($stringid, $component = 'moodle', $lang = null, $stringparams = array()) {
        $params = self::validate_parameters(self::get_string_parameters(),
                      array('stringid'=>$stringid, 'component' => $component, 'lang' => $lang, 'stringparams' => $stringparams));

        $stringmanager = get_string_manager();
        return $stringmanager->get_string($params['stringid'], $params['component'],
            core_external::format_string_parameters($params['stringparams']), $params['lang']);
    }

    /**
     * Returns description of get_string() result value
     *
     * @return \core_external\external_description
     * @since Moodle 2.4
     */
    public static function get_string_returns() {
        return new external_value(PARAM_RAW, 'translated string');
    }

    /**
     * Returns description of get_string parameters
     *
     * @return external_function_parameters
     * @since Moodle 2.4
     */
    public static function get_strings_parameters() {
        return new external_function_parameters(
            array('strings' => new external_multiple_structure (
                    new external_single_structure (array(
                        'stringid' => new external_value(PARAM_STRINGID, 'string identifier'),
                        'component' => new external_value(PARAM_COMPONENT, 'component', VALUE_DEFAULT, 'moodle'),
                        'lang' => new external_value(PARAM_LANG, 'lang', VALUE_DEFAULT, null),
                        'stringparams' => new external_multiple_structure (
                            new external_single_structure(array(
                                'name' => new external_value(PARAM_ALPHANUMEXT, 'param name
                                    - if the string expect only one $a parameter then don\'t send this field, just send the value.', VALUE_OPTIONAL),
                                'value' => new external_value(PARAM_RAW, 'param value'))),
                                'the definition of a string param (i.e. {$a->name})', VALUE_DEFAULT, array()
                        ))
                    )
                )
            )
        );
    }

    /**
     * Return multiple call to core get_string()
     *
     * @param array $strings strings to translate
     * @return array
     *
     * @since Moodle 2.4
     */
    public static function get_strings($strings) {
        $params = self::validate_parameters(self::get_strings_parameters(),
                      array('strings'=>$strings));
        $stringmanager = get_string_manager();

        $translatedstrings = array();
        foreach($params['strings'] as $string) {

            if (!empty($string['lang'])) {
                $lang = $string['lang'];
            } else {
                $lang = current_language();
            }

            $translatedstrings[] = array(
                'stringid' => $string['stringid'],
                'component' => $string['component'],
                'lang' => $lang,
                'string' => $stringmanager->get_string($string['stringid'], $string['component'],
                    core_external::format_string_parameters($string['stringparams']), $lang));
        }

        return $translatedstrings;
    }

    /**
     * Returns description of get_string() result value
     *
     * @return \core_external\external_description
     * @since Moodle 2.4
     */
    public static function get_strings_returns() {
        return new external_multiple_structure(
            new external_single_structure(array(
                'stringid' => new external_value(PARAM_STRINGID, 'string id'),
                'component' => new external_value(PARAM_COMPONENT, 'string component'),
                'lang' => new external_value(PARAM_LANG, 'lang'),
                'string' => new external_value(PARAM_RAW, 'translated string'))
            ));
    }

    /**
     * Returns description of get_user_dates parameters
     *
     * @return external_function_parameters
     */
    public static function get_user_dates_parameters() {
        return new external_function_parameters(
            [
                'contextid' => new external_value(
                    PARAM_INT,
                    'Context ID. Either use this value, or level and instanceid.',
                    VALUE_DEFAULT,
                    0
                ),
                'contextlevel' => new external_value(
                    PARAM_ALPHA,
                    'Context level. To be used with instanceid.',
                    VALUE_DEFAULT,
                    ''
                ),
                'instanceid' => new external_value(
                    PARAM_INT,
                    'Context instance ID. To be used with level',
                    VALUE_DEFAULT,
                    0
                ),
                'timestamps' => new external_multiple_structure (
                    new external_single_structure (
                        [
                            'timestamp' => new external_value(PARAM_INT, 'unix timestamp'),
                            'format' => new external_value(PARAM_TEXT, 'format string'),
                            'type' => new external_value(PARAM_PLUGIN, 'The calendar type', VALUE_DEFAULT),
                            'fixday' => new external_value(PARAM_INT, 'Remove leading zero for day', VALUE_DEFAULT, 1),
                            'fixhour' => new external_value(PARAM_INT, 'Remove leading zero for hour', VALUE_DEFAULT, 1),
                        ]
                    )
                )
            ]
        );
    }

    /**
     * Format an array of timestamps.
     *
     * @param int|null $contextid The contenxt id
     * @param string|null $contextlevel The context level
     * @param int|null $instanceid The instnace id for the context level
     * @param array $timestamps Timestamps to format
     * @return array
     */
    public static function get_user_dates($contextid, $contextlevel, $instanceid, $timestamps) {
        $params = self::validate_parameters(
            self::get_user_dates_parameters(),
            [
                'contextid' => $contextid,
                'contextlevel' => $contextlevel,
                'instanceid' => $instanceid,
                'timestamps' => $timestamps,
            ]
        );

        $context = self::get_context_from_params($params);
        self::validate_context($context);

        $formatteddates = array_map(function($timestamp) {

            $calendartype = $timestamp['type'];
            $fixday = !empty($timestamp['fixday']);
            $fixhour = !empty($timestamp['fixhour']);
            $calendar  = \core_calendar\type_factory::get_calendar_instance($calendartype);
            return $calendar->timestamp_to_date_string($timestamp['timestamp'], $timestamp['format'], 99, $fixday, $fixhour);
        }, $params['timestamps']);

        return ['dates' => $formatteddates];
    }

    /**
     * Returns description of get_user_dates() result value
     *
     * @return \core_external\external_description
     */
    public static function get_user_dates_returns() {
        return new external_single_structure(
            [
                'dates' => new external_multiple_structure (
                    new external_value(PARAM_TEXT, 'formatted dates strings')
                )
            ]
        );
    }

     /**
     * Returns description of get_component_strings parameters
     *
     * @return external_function_parameters
     * @since Moodle 2.4
     */
    public static function get_component_strings_parameters() {
        return new external_function_parameters(
            array('component' => new external_value(PARAM_COMPONENT, 'component'),
                  'lang' => new external_value(PARAM_LANG, 'lang', VALUE_DEFAULT, null),
            )
        );
    }

    /**
     * Return all lang strings of a component - call to core get_component_strings().
     *
     * @param string $component component name
     * @return array
     *
     * @since Moodle 2.4
     */
    public static function get_component_strings($component, $lang = null) {

        if (empty($lang)) {
            $lang = current_language();
        }

        $params = self::validate_parameters(self::get_component_strings_parameters(),
                      array('component'=>$component, 'lang' => $lang));

        $stringmanager = get_string_manager();

        $wsstrings = array();
        $componentstrings = $stringmanager->load_component_strings($params['component'], $params['lang']);
        foreach($componentstrings as $stringid => $string) {
            $wsstring = array();
            $wsstring['stringid'] = $stringid;
            $wsstring['string'] = $string;
            $wsstrings[] = $wsstring;
        }

        return $wsstrings;
    }

    /**
     * Returns description of get_component_strings() result value
     *
     * @return \core_external\external_description
     * @since Moodle 2.4
     */
    public static function get_component_strings_returns() {
        return new external_multiple_structure(
            new external_single_structure(array(
                'stringid' => new external_value(PARAM_STRINGID, 'string id'),
                'string' => new external_value(PARAM_RAW, 'translated string'))
            ));
    }

    /**
     * Returns description of get_fragment parameters
     *
     * @return external_function_parameters
     * @since Moodle 3.1
     */
    public static function get_fragment_parameters() {
        return new external_function_parameters(
            array(
                'component' => new external_value(PARAM_COMPONENT, 'Component for the callback e.g. mod_assign'),
                'callback' => new external_value(PARAM_ALPHANUMEXT, 'Name of the callback to execute'),
                'contextid' => new external_value(PARAM_INT, 'Context ID that the fragment is from'),
                'args' => new external_multiple_structure(
                    new external_single_structure(
                        array(
                            'name' => new external_value(PARAM_ALPHANUMEXT, 'param name'),
                            'value' => new external_value(PARAM_RAW, 'param value')
                        )
                    ), 'args for the callback are optional', VALUE_OPTIONAL
                )
            )
        );
    }

    /**
     * Get a HTML fragment for inserting into something. Initial use is for inserting mforms into
     * a page using AJAX.
     * This web service is designed to be called only via AJAX and not directly.
     * Callbacks that are called by this web service are responsible for doing the appropriate security checks
     * to access the information returned. This only does minimal validation on the context.
     *
     * @param string $component Name of the component.
     * @param string $callback Function callback name.
     * @param int $contextid Context ID this fragment is in.
     * @param array $args optional arguments for the callback.
     * @return array HTML and JavaScript fragments for insertion into stuff.
     * @since Moodle 3.1
     */
    public static function get_fragment($component, $callback, $contextid, $args = null) {
        global $OUTPUT, $PAGE;

        $params = self::validate_parameters(self::get_fragment_parameters(),
                array(
                    'component' => $component,
                    'callback' => $callback,
                    'contextid' => $contextid,
                    'args' => $args
                )
        );

        // Reformat arguments into something less unwieldy.
        $arguments = array();
        foreach ($params['args'] as $paramargument) {
            $arguments[$paramargument['name']] = $paramargument['value'];
        }

        $context = context::instance_by_id($contextid);
        self::validate_context($context);
        $arguments['context'] = $context;

        // Hack alert: Set a default URL to stop the annoying debug.
        $PAGE->set_url('/');
        // Hack alert: Forcing bootstrap_renderer to initiate moodle page.
        $OUTPUT->header();

        // Overwriting page_requirements_manager with the fragment one so only JS included from
        // this point is returned to the user.
        $PAGE->start_collecting_javascript_requirements();
        $data = component_callback($params['component'], 'output_fragment_' . $params['callback'], array($arguments));
        $jsfooter = $PAGE->requires->get_end_code();
        $output = array('html' => $data, 'javascript' => $jsfooter);
        return $output;
    }

    /**
     * Returns description of get_fragment() result value
     *
     * @return \core_external\external_description
     * @since Moodle 3.1
     */
    public static function get_fragment_returns() {
        return new external_single_structure(
            array(
                'html' => new external_value(PARAM_RAW, 'HTML fragment.'),
                'javascript' => new external_value(PARAM_RAW, 'JavaScript fragment')
            )
        );
    }

    /**
     * Parameters for function update_inplace_editable()
     *
     * @since Moodle 3.1
     * @return external_function_parameters
     */
    public static function update_inplace_editable_parameters() {
        return new external_function_parameters(
            array(
                'component' => new external_value(PARAM_COMPONENT, 'component responsible for the update', VALUE_REQUIRED),
                'itemtype' => new external_value(PARAM_NOTAGS, 'type of the updated item inside the component', VALUE_REQUIRED),
                'itemid' => new external_value(PARAM_RAW, 'identifier of the updated item', VALUE_REQUIRED),
                'value' => new external_value(PARAM_RAW, 'new value', VALUE_REQUIRED),
            ));
    }

    /**
     * Update any component's editable value assuming that component implements necessary callback
     *
     * @since Moodle 3.1
     * @param string $component
     * @param string $itemtype
     * @param string $itemid
     * @param string $value
     */
    public static function update_inplace_editable($component, $itemtype, $itemid, $value) {
        global $PAGE;
        // Validate and normalize parameters.
        $params = self::validate_parameters(self::update_inplace_editable_parameters(),
                      array('component' => $component, 'itemtype' => $itemtype, 'itemid' => $itemid, 'value' => $value));
        if (!$functionname = component_callback_exists($component, 'inplace_editable')) {
            throw new \moodle_exception('inplaceeditableerror');
        }
        $tmpl = component_callback($params['component'], 'inplace_editable',
            array($params['itemtype'], $params['itemid'], $params['value']));
        if (!$tmpl || !($tmpl instanceof \core\output\inplace_editable)) {
            throw new \moodle_exception('inplaceeditableerror');
        }
        return $tmpl->export_for_template($PAGE->get_renderer('core'));
    }

    /**
     * Return structure for update_inplace_editable()
     *
     * @since Moodle 3.1
     * @return \core_external\external_description
     */
    public static function update_inplace_editable_returns() {
        return new external_single_structure(
            array(
                'displayvalue' => new external_value(PARAM_RAW, 'display value (may contain link or other html tags)'),
                'component' => new external_value(PARAM_NOTAGS, 'component responsible for the update', VALUE_OPTIONAL),
                'itemtype' => new external_value(PARAM_NOTAGS, 'itemtype', VALUE_OPTIONAL),
                'value' => new external_value(PARAM_RAW, 'value of the item as it is stored', VALUE_OPTIONAL),
                'itemid' => new external_value(PARAM_RAW, 'identifier of the updated item', VALUE_OPTIONAL),
                'edithint' => new external_value(PARAM_NOTAGS, 'hint for editing element', VALUE_OPTIONAL),
                'editlabel' => new external_value(PARAM_RAW, 'label for editing element', VALUE_OPTIONAL),
                'editicon' => new external_single_structure([
                    'key' => new external_value(PARAM_RAW, 'Edit icon key', VALUE_OPTIONAL),
                    'component' => new external_value(PARAM_COMPONENT, 'Edit icon component', VALUE_OPTIONAL),
                    'title' => new external_value(PARAM_NOTAGS, 'Edit icon title', VALUE_OPTIONAL),
                ], 'Edit icon', VALUE_OPTIONAL),
                'type' => new external_value(PARAM_ALPHA, 'type of the element (text, toggle, select)', VALUE_OPTIONAL),
                'options' => new external_value(PARAM_RAW, 'options of the element, format depends on type', VALUE_OPTIONAL),
                'linkeverything' => new external_value(PARAM_INT, 'Should everything be wrapped in the edit link or link displayed separately', VALUE_OPTIONAL),
            )
        );
    }

    /**
     * Returns description of fetch_notifications() parameters.
     *
     * @return external_function_parameters
     * @since Moodle 3.1
     */
    public static function fetch_notifications_parameters() {
        return new external_function_parameters(
            array(
                'contextid' => new external_value(PARAM_INT, 'Context ID', VALUE_REQUIRED),
            ));
    }

    /**
     * Returns description of fetch_notifications() result value.
     *
     * @return \core_external\external_description
     * @since Moodle 3.1
     */
    public static function fetch_notifications_returns() {
        return new external_multiple_structure(
            new external_single_structure(
                array(
                    'template'      => new external_value(PARAM_RAW, 'Name of the template'),
                    'variables'     => new external_single_structure(array(
                        'message'       => new external_value(PARAM_RAW, 'HTML content of the Notification'),
                        'extraclasses'  => new external_value(PARAM_RAW, 'Extra classes to provide to the tmeplate'),
                        'announce'      => new external_value(PARAM_RAW, 'Whether to announce'),
                        'closebutton'   => new external_value(PARAM_RAW, 'Whether to close'),
                    )),
                )
            )
        );
    }

    /**
     * Returns the list of notifications against the current session.
     *
     * @return array
     * @since Moodle 3.1
     */
    public static function fetch_notifications($contextid) {
        global $PAGE;

        self::validate_parameters(self::fetch_notifications_parameters(), [
                'contextid' => $contextid,
            ]);

        $context = \context::instance_by_id($contextid);
        self::validate_context($context);

        return \core\notification::fetch_as_array($PAGE->get_renderer('core'));
    }
}

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