C:/xampp/htdocs/moodle/webservice/rest/locallib.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->dirroot/webservice/lib.php");

class webservice_rest_server extends webservice_base_server {

    protected $restformat;

    public function __construct($authmethod, $restformat = 'xml') {
        parent::__construct($authmethod);
        $this->wsname = 'rest';
        $this->restformat = ($restformat != 'xml' && $restformat != 'json')?'xml':$restformat; //sanity check, we accept only xml or json
    }

    protected function parse_request() {

        //Get GET and POST paramters
        $methodvariables = array_merge($_GET,$_POST);

        if ($this->authmethod == WEBSERVICE_AUTHMETHOD_USERNAME) {
            $this->username = isset($methodvariables['wsusername']) ? $methodvariables['wsusername'] : null;
            unset($methodvariables['wsusername']);

            $this->password = isset($methodvariables['wspassword']) ? $methodvariables['wspassword'] : null;
            unset($methodvariables['wspassword']);

            $this->functionname = isset($methodvariables['wsfunction']) ? $methodvariables['wsfunction'] : null;
            unset($methodvariables['wsfunction']);

            $this->parameters = $methodvariables;

        } else {
            $this->token = isset($methodvariables['wstoken']) ? $methodvariables['wstoken'] : null;
            unset($methodvariables['wstoken']);

            $this->functionname = isset($methodvariables['wsfunction']) ? $methodvariables['wsfunction'] : null;
            unset($methodvariables['wsfunction']);

            $this->parameters = $methodvariables;
        }
    }

    protected function send_response() {

        //Check that the returned values are valid
        try {
            if ($this->function->returns_desc != null) {
                $validatedvalues = external_api::clean_returnvalue($this->function->returns_desc, $this->returns);
            } else {
                $validatedvalues = null;
            }
        } catch (Exception $ex) {
            $exception = $ex;
        }

        if (!empty($exception)) {
            $response =  $this->generate_error($exception);
        } else {
            //We can now convert the response to the requested REST format
            if ($this->restformat == 'json') {
                $response = json_encode($validatedvalues);
            } else {
                $response = '<?xml version="1.0" encoding="UTF-8" ?>'."\n";
                $response .= '<RESPONSE>'."\n";
                $response .= self::xmlize_result($this->returns, $this->function->returns_desc);
                $response .= '</RESPONSE>'."\n";
            }
        }

        $this->send_headers();
        echo $response;
    }

    protected function send_error($ex=null) {
        $this->send_headers();
        echo $this->generate_error($ex);
    }

    protected function generate_error($ex) {
        if ($this->restformat == 'json') {
            $errorobject = new stdClass;
            $errorobject->exception = get_class($ex);
            $errorobject->message = $ex->getMessage();
            if (debugging() and isset($ex->debuginfo)) {
                $errorobject->debuginfo = $ex->debuginfo;
            }
            $error = json_encode($errorobject);
        } else {
            $error = '<?xml version="1.0" encoding="UTF-8" ?>'."\n";
            $error .= '<EXCEPTION class="'.get_class($ex).'">'."\n";
            $error .= '<MESSAGE>'.htmlspecialchars($ex->getMessage(), ENT_COMPAT, 'UTF-8').'</MESSAGE>'."\n";
            if (debugging() and isset($ex->debuginfo)) {
                $error .= '<DEBUGINFO>'.htmlspecialchars($ex->debuginfo, ENT_COMPAT, 'UTF-8').'</DEBUGINFO>'."\n";
            }
            $error .= '</EXCEPTION>'."\n";
        }
        return $error;
    }

    protected function send_headers() {
        if ($this->restformat == 'json') {
            header('Content-type: application/json');
        } else {
            header('Content-Type: application/xml; charset=utf-8');
            header('Content-Disposition: inline; filename="response.xml"');
        }
        header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
        header('Expires: '. gmdate('D, d M Y H:i:s', 0) .' GMT');
        header('Pragma: no-cache');
        header('Accept-Ranges: none');
    }

    protected static function xmlize_result($returns, $desc) {
        if ($desc === null) {
            return '';

        } else if ($desc instanceof external_value) {
            if (is_bool($returns)) {
                // we want 1/0 instead of true/false here
                $returns = (int)$returns;
            }
            if (is_null($returns)) {
                return '<VALUE null="null"/>'."\n";
            } else {
                return '<VALUE>'.htmlspecialchars($returns, ENT_COMPAT, 'UTF-8').'</VALUE>'."\n";
            }

        } else if ($desc instanceof external_multiple_structure) {
            $mult = '<MULTIPLE>'."\n";
            if (!empty($returns)) {
                foreach ($returns as $val) {
                    $mult .= self::xmlize_result($val, $desc->content);
                }
            }
            $mult .= '</MULTIPLE>'."\n";
            return $mult;

        } else if ($desc instanceof external_single_structure) {
            $single = '<SINGLE>'."\n";
            foreach ($desc->keys as $key=>$subdesc) {
                $single .= '<KEY name="'.$key.'">'.self::xmlize_result($returns[$key], $subdesc).'</KEY>'."\n";
            }
            $single .= '</SINGLE>'."\n";
            return $single;
        }
    }
}


class webservice_rest_test_client implements webservice_test_client_interface {
    public function simpletest($serverurl, $function, $params) {
        return download_file_content($serverurl.'&wsfunction='.$function, null, $params);
    }
}