C:/xampp/htdocs/moodle/message/externallib.php

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<?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/>.

require_once("$CFG->libdir/externallib.php");

class core_message_external extends external_api {

    public static function send_instant_messages_parameters() {
        return new external_function_parameters(
            array(
                'messages' => new external_multiple_structure(
                    new external_single_structure(
                        array(
                            'touserid' => new external_value(PARAM_INT, 'id of the user to send the private message'),
                            'text' => new external_value(PARAM_RAW, 'the text of the message - not that you can send anything it will be automatically cleaned to PARAM_TEXT and used againt MOODLE_FORMAT'),
                            'clientmsgid' => new external_value(PARAM_ALPHANUMEXT, 'your own client id for the message. If this id is provided, the fail message id will be returned to you', VALUE_OPTIONAL),
                        )
                    )
                )
            )
        );
    }

    public static function send_instant_messages($messages = array()) {
        global $CFG, $USER, $DB;
        require_once($CFG->dirroot . "/message/lib.php");

        //check if messaging is enabled
        if (!$CFG->messaging) {
            throw new moodle_exception('disabled', 'message');
        }

        // Ensure the current user is allowed to run this function
        $context = get_context_instance(CONTEXT_SYSTEM);
        self::validate_context($context);
        require_capability('moodle/site:sendmessage', $context);

        $params = self::validate_parameters(self::send_instant_messages_parameters(), array('messages' => $messages));

        //retrieve all tousers of the messages
        $receivers = array();
        foreach($params['messages'] as $message) {
            $receivers[] = $message['touserid'];
        }
        list($sqluserids, $sqlparams) = $DB->get_in_or_equal($receivers, SQL_PARAMS_NAMED, 'userid_');
        $tousers = $DB->get_records_select("user", "id " . $sqluserids . " AND deleted = 0", $sqlparams);
        $blocklist   = array();
        $contactlist = array();
        $sqlparams['contactid'] = $USER->id;
        $rs = $DB->get_recordset_sql("SELECT *
                                        FROM {message_contacts}
                                       WHERE userid $sqluserids
                                             AND contactid = :contactid", $sqlparams);
        foreach ($rs as $record) {
            if ($record->blocked) {
                // $record->userid is blocking current user
                $blocklist[$record->userid] = true;
            } else {
                // $record->userid have current user as contact
                $contactlist[$record->userid] = true;
            }
        }
        $rs->close();

        $canreadallmessages = has_capability('moodle/site:readallmessages', $context);

        $resultmessages = array();
        foreach ($params['messages'] as $message) {
            $text = clean_param($message['text'], PARAM_TEXT);
            $resultmsg = array(); //the infos about the success of the operation

            //we are going to do some checking
            //code should match /messages/index.php checks
            $success = true;

            //check the user exists
            if (empty($tousers[$message['touserid']])) {
                $success = false;
                $errormessage = get_string('touserdoesntexist', 'message', $message['touserid']);
            }

            //check that the touser is not blocking the current user
            if ($success and !empty($blocklist[$message['touserid']]) and !$canreadallmessages) {
                $success = false;
                $errormessage = get_string('userisblockingyou', 'message');
            }

            // Check if the user is a contact
            //TODO: performance improvement - edit the function so we can pass an array instead userid
            $blocknoncontacts = get_user_preferences('message_blocknoncontacts', NULL, $message['touserid']);
            // message_blocknoncontacts option is on and current user is not in contact list
            if ($success && empty($contactlist[$message['touserid']]) && !empty($blocknoncontacts)) {
                // The user isn't a contact and they have selected to block non contacts so this message won't be sent.
                $success = false;
                $errormessage = get_string('userisblockingyounoncontact', 'message');
            }

            //now we can send the message (at least try)
            if ($success) {
                //TODO: performance improvement - edit the function so we can pass an array instead one touser object
                $success = message_post_message($USER, $tousers[$message['touserid']], $text, FORMAT_MOODLE);
            }

            //build the resultmsg
            if (isset($message['clientmsgid'])) {
                $resultmsg['clientmsgid'] = $message['clientmsgid'];
            }
            if ($success) {
                $resultmsg['msgid'] = $success;
            } else {
                $resultmsg['msgid'] = -1;
                $resultmsg['errormessage'] = $errormessage;
            }

            $resultmessages[] = $resultmsg;
        }

        return $resultmessages;
    }

    public static function send_instant_messages_returns() {
        return new external_multiple_structure(
            new external_single_structure(
                array(
                    'msgid' => new external_value(PARAM_INT, 'test this to know if it succeeds:  id of the created message if it succeeded, -1 when failed'),
                    'clientmsgid' => new external_value(PARAM_ALPHANUMEXT, 'your own id for the message', VALUE_OPTIONAL),
                    'errormessage' => new external_value(PARAM_TEXT, 'error message - if it failed', VALUE_OPTIONAL)
                )
            )
        );
    }

}

class moodle_message_external extends external_api {

    public static function send_instantmessages_parameters() {
        return core_message_external::send_instant_messages_parameters();
    }

    public static function send_instantmessages($messages = array()) {
        return core_message_external::send_instant_messages($messages);
    }

    public static function send_instantmessages_returns() {
        return core_message_external::send_instant_messages_returns();
    }

}