mirror of
https://github.com/moodle/moodle.git
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644 lines
24 KiB
PHP
644 lines
24 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Support for external API
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*
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* @package core_webservice
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* @copyright 2009 Petr Skodak
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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class_alias(\core_external\external_api::class, 'external_api');
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class_alias(\core_external\restricted_context_exception::class, 'restricted_context_exception');
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class_alias(\core_external\external_description::class, 'external_description');
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class_alias(\core_external\external_value::class, 'external_value');
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class_alias(\core_external\external_single_structure::class, 'external_single_structure');
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class_alias(\core_external\external_multiple_structure::class, 'external_multiple_structure');
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class_alias(\core_external\external_function_parameters::class, 'external_function_parameters');
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class_alias(\core_external\util::class, 'external_util');
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class_alias(\core_external\external_files::class, 'external_files');
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class_alias(\core_external\external_warnings::class, 'external_warnings');
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/**
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* Generate a token
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*
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* @param string $tokentype EXTERNAL_TOKEN_EMBEDDED|EXTERNAL_TOKEN_PERMANENT
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* @param stdClass|int $serviceorid service linked to the token
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* @param int $userid user linked to the token
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* @param stdClass|int $contextorid
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* @param int $validuntil date when the token expired
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* @param string $iprestriction allowed ip - if 0 or empty then all ips are allowed
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* @return string generated token
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* @author 2010 Jamie Pratt
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* @since Moodle 2.0
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*/
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function external_generate_token($tokentype, $serviceorid, $userid, $contextorid, $validuntil=0, $iprestriction=''){
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global $DB, $USER;
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// make sure the token doesn't exist (even if it should be almost impossible with the random generation)
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$numtries = 0;
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do {
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$numtries ++;
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$generatedtoken = md5(uniqid(rand(),1));
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if ($numtries > 5){
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throw new moodle_exception('tokengenerationfailed');
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}
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} while ($DB->record_exists('external_tokens', array('token'=>$generatedtoken)));
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$newtoken = new stdClass();
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$newtoken->token = $generatedtoken;
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if (!is_object($serviceorid)){
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$service = $DB->get_record('external_services', array('id' => $serviceorid));
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} else {
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$service = $serviceorid;
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}
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if (!is_object($contextorid)){
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$context = context::instance_by_id($contextorid, MUST_EXIST);
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} else {
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$context = $contextorid;
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}
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if (empty($service->requiredcapability) || has_capability($service->requiredcapability, $context, $userid)) {
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$newtoken->externalserviceid = $service->id;
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} else {
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throw new moodle_exception('nocapabilitytousethisservice');
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}
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$newtoken->tokentype = $tokentype;
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$newtoken->userid = $userid;
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if ($tokentype == EXTERNAL_TOKEN_EMBEDDED){
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$newtoken->sid = session_id();
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}
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$newtoken->contextid = $context->id;
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$newtoken->creatorid = $USER->id;
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$newtoken->timecreated = time();
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$newtoken->validuntil = $validuntil;
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if (!empty($iprestriction)) {
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$newtoken->iprestriction = $iprestriction;
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}
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// Generate the private token, it must be transmitted only via https.
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$newtoken->privatetoken = random_string(64);
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$DB->insert_record('external_tokens', $newtoken);
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return $newtoken->token;
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}
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/**
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* Create and return a session linked token. Token to be used for html embedded client apps that want to communicate
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* with the Moodle server through web services. The token is linked to the current session for the current page request.
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* It is expected this will be called in the script generating the html page that is embedding the client app and that the
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* returned token will be somehow passed into the client app being embedded in the page.
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*
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* @param string $servicename name of the web service. Service name as defined in db/services.php
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* @param int $context context within which the web service can operate.
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* @return int returns token id.
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* @since Moodle 2.0
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*/
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function external_create_service_token($servicename, $context){
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global $USER, $DB;
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$service = $DB->get_record('external_services', array('name'=>$servicename), '*', MUST_EXIST);
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return external_generate_token(EXTERNAL_TOKEN_EMBEDDED, $service, $USER->id, $context, 0);
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}
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/**
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* Delete all pre-built services (+ related tokens) and external functions information defined in the specified component.
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*
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* @param string $component name of component (moodle, mod_assignment, etc.)
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*/
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function external_delete_descriptions($component) {
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global $DB;
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$params = array($component);
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$DB->delete_records_select('external_tokens',
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"externalserviceid IN (SELECT id FROM {external_services} WHERE component = ?)", $params);
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$DB->delete_records_select('external_services_users',
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"externalserviceid IN (SELECT id FROM {external_services} WHERE component = ?)", $params);
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$DB->delete_records_select('external_services_functions',
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"functionname IN (SELECT name FROM {external_functions} WHERE component = ?)", $params);
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$DB->delete_records('external_services', array('component'=>$component));
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$DB->delete_records('external_functions', array('component'=>$component));
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}
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/**
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* A pre-filled external_value class for text format.
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*
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* Default is FORMAT_HTML
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* This should be used all the time in external xxx_params()/xxx_returns functions
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* as it is the standard way to implement text format param/return values.
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*
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* @package core_webservice
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* @copyright 2012 Jerome Mouneyrac
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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* @since Moodle 2.3
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*/
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class external_format_value extends external_value {
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/**
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* Constructor
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*
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* @param string $textfieldname Name of the text field
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* @param int $required if VALUE_REQUIRED then set standard default FORMAT_HTML
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* @param int $default Default value.
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* @since Moodle 2.3
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*/
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public function __construct($textfieldname, $required = VALUE_REQUIRED, $default = null) {
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if ($default == null && $required == VALUE_DEFAULT) {
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$default = FORMAT_HTML;
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}
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$desc = $textfieldname . ' format (' . FORMAT_HTML . ' = HTML, '
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. FORMAT_MOODLE . ' = MOODLE, '
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. FORMAT_PLAIN . ' = PLAIN or '
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. FORMAT_MARKDOWN . ' = MARKDOWN)';
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parent::__construct(PARAM_INT, $desc, $required, $default);
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}
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}
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/**
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* Validate text field format against known FORMAT_XXX
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*
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* @param array $format the format to validate
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* @return the validated format
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* @throws coding_exception
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* @since Moodle 2.3
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*/
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function external_validate_format($format) {
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$allowedformats = array(FORMAT_HTML, FORMAT_MOODLE, FORMAT_PLAIN, FORMAT_MARKDOWN);
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if (!in_array($format, $allowedformats)) {
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throw new moodle_exception('formatnotsupported', 'webservice', '' , null,
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'The format with value=' . $format . ' is not supported by this Moodle site');
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}
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return $format;
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}
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/**
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* Format the string to be returned properly as requested by the either the web service server,
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* either by an internally call.
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* The caller can change the format (raw) with the external_settings singleton
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* All web service servers must set this singleton when parsing the $_GET and $_POST.
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*
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* <pre>
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* Options are the same that in {@link format_string()} with some changes:
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* filter : Can be set to false to force filters off, else observes {@link external_settings}.
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* </pre>
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*
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* @param string $str The string to be filtered. Should be plain text, expect
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* possibly for multilang tags.
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* @param boolean $striplinks To strip any link in the result text. Moodle 1.8 default changed from false to true! MDL-8713
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* @param context|int $contextorid The id of the context for the string or the context (affects filters).
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* @param array $options options array/object or courseid
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* @return string text
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* @since Moodle 3.0
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*/
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function external_format_string($str, $contextorid, $striplinks = true, $options = array()) {
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// Get settings (singleton).
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$settings = external_settings::get_instance();
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if (empty($contextorid)) {
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throw new coding_exception('contextid is required');
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}
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if (!$settings->get_raw()) {
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if (is_object($contextorid) && is_a($contextorid, 'context')) {
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$context = $contextorid;
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} else {
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$context = context::instance_by_id($contextorid);
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}
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$options['context'] = $context;
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$options['filter'] = isset($options['filter']) && !$options['filter'] ? false : $settings->get_filter();
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$str = format_string($str, $striplinks, $options);
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}
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return $str;
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}
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/**
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* Format the text to be returned properly as requested by the either the web service server,
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* either by an internally call.
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* The caller can change the format (raw, filter, file, fileurl) with the external_settings singleton
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* All web service servers must set this singleton when parsing the $_GET and $_POST.
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*
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* <pre>
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* Options are the same that in {@link format_text()} with some changes in defaults to provide backwards compatibility:
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* trusted : If true the string won't be cleaned. Default false.
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* noclean : If true the string won't be cleaned only if trusted is also true. Default false.
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* nocache : If true the string will not be cached and will be formatted every call. Default false.
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* filter : Can be set to false to force filters off, else observes {@link external_settings}.
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* para : If true then the returned string will be wrapped in div tags. Default (different from format_text) false.
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* Default changed because div tags are not commonly needed.
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* newlines : If true then lines newline breaks will be converted to HTML newline breaks. Default true.
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* context : Not used! Using contextid parameter instead.
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* overflowdiv : If set to true the formatted text will be encased in a div with the class no-overflow before being
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* returned. Default false.
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* allowid : If true then id attributes will not be removed, even when using htmlpurifier. Default (different from
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* format_text) true. Default changed id attributes are commonly needed.
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* blanktarget : If true all <a> tags will have target="_blank" added unless target is explicitly specified.
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* </pre>
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*
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* @param string $text The content that may contain ULRs in need of rewriting.
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* @param int $textformat The text format.
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* @param context|int $contextorid This parameter and the next two identify the file area to use.
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* @param string $component
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* @param string $filearea helps identify the file area.
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* @param int $itemid helps identify the file area.
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* @param object/array $options text formatting options
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* @return array text + textformat
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* @since Moodle 2.3
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* @since Moodle 3.2 component, filearea and itemid are optional parameters
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*/
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function external_format_text($text, $textformat, $contextorid, $component = null, $filearea = null, $itemid = null,
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$options = null) {
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global $CFG;
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// Get settings (singleton).
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$settings = external_settings::get_instance();
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if (is_object($contextorid) && is_a($contextorid, 'context')) {
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$context = $contextorid;
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$contextid = $context->id;
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} else {
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$context = null;
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$contextid = $contextorid;
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}
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if ($component and $filearea and $settings->get_fileurl()) {
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require_once($CFG->libdir . "/filelib.php");
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$text = file_rewrite_pluginfile_urls($text, $settings->get_file(), $contextid, $component, $filearea, $itemid);
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}
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// Note that $CFG->forceclean does not apply here if the client requests for the raw database content.
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// This is consistent with web clients that are still able to load non-cleaned text into editors, too.
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if (!$settings->get_raw()) {
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$options = (array)$options;
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// If context is passed in options, check that is the same to show a debug message.
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if (isset($options['context'])) {
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if ((is_object($options['context']) && $options['context']->id != $contextid)
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|| (!is_object($options['context']) && $options['context'] != $contextid)) {
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debugging('Different contexts found in external_format_text parameters. $options[\'context\'] not allowed.
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Using $contextid parameter...', DEBUG_DEVELOPER);
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}
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}
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$options['filter'] = isset($options['filter']) && !$options['filter'] ? false : $settings->get_filter();
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$options['para'] = isset($options['para']) ? $options['para'] : false;
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$options['context'] = !is_null($context) ? $context : context::instance_by_id($contextid);
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$options['allowid'] = isset($options['allowid']) ? $options['allowid'] : true;
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$text = format_text($text, $textformat, $options);
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$textformat = FORMAT_HTML; // Once converted to html (from markdown, plain... lets inform consumer this is already HTML).
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}
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return array($text, $textformat);
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}
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/**
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* Generate or return an existing token for the current authenticated user.
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* This function is used for creating a valid token for users authenticathing via login/token.php or admin/tool/mobile/launch.php.
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*
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* @param stdClass $service external service object
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* @return stdClass token object
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* @since Moodle 3.2
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* @throws moodle_exception
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*/
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function external_generate_token_for_current_user($service) {
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global $DB, $USER, $CFG;
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core_user::require_active_user($USER, true, true);
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// Check if there is any required system capability.
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if ($service->requiredcapability and !has_capability($service->requiredcapability, context_system::instance())) {
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throw new moodle_exception('missingrequiredcapability', 'webservice', '', $service->requiredcapability);
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}
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// Specific checks related to user restricted service.
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if ($service->restrictedusers) {
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$authoriseduser = $DB->get_record('external_services_users',
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array('externalserviceid' => $service->id, 'userid' => $USER->id));
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if (empty($authoriseduser)) {
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throw new moodle_exception('usernotallowed', 'webservice', '', $service->shortname);
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}
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if (!empty($authoriseduser->validuntil) and $authoriseduser->validuntil < time()) {
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throw new moodle_exception('invalidtimedtoken', 'webservice');
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}
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if (!empty($authoriseduser->iprestriction) and !address_in_subnet(getremoteaddr(), $authoriseduser->iprestriction)) {
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throw new moodle_exception('invalidiptoken', 'webservice');
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}
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}
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// Check if a token has already been created for this user and this service.
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$conditions = array(
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'userid' => $USER->id,
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'externalserviceid' => $service->id,
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'tokentype' => EXTERNAL_TOKEN_PERMANENT
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);
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$tokens = $DB->get_records('external_tokens', $conditions, 'timecreated ASC');
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// A bit of sanity checks.
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foreach ($tokens as $key => $token) {
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// Checks related to a specific token. (script execution continue).
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$unsettoken = false;
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// If sid is set then there must be a valid associated session no matter the token type.
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if (!empty($token->sid)) {
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if (!\core\session\manager::session_exists($token->sid)) {
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// This token will never be valid anymore, delete it.
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$DB->delete_records('external_tokens', array('sid' => $token->sid));
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$unsettoken = true;
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}
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}
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// Remove token is not valid anymore.
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if (!empty($token->validuntil) and $token->validuntil < time()) {
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$DB->delete_records('external_tokens', array('token' => $token->token, 'tokentype' => EXTERNAL_TOKEN_PERMANENT));
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$unsettoken = true;
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}
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// Remove token if its IP is restricted.
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if (isset($token->iprestriction) and !address_in_subnet(getremoteaddr(), $token->iprestriction)) {
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$unsettoken = true;
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}
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if ($unsettoken) {
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unset($tokens[$key]);
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}
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}
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// If some valid tokens exist then use the most recent.
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if (count($tokens) > 0) {
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$token = array_pop($tokens);
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} else {
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$context = context_system::instance();
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$isofficialservice = $service->shortname == MOODLE_OFFICIAL_MOBILE_SERVICE;
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if (($isofficialservice and has_capability('moodle/webservice:createmobiletoken', $context)) or
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(!is_siteadmin($USER) && has_capability('moodle/webservice:createtoken', $context))) {
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// Create a new token.
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$token = new stdClass;
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$token->token = md5(uniqid(rand(), 1));
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$token->userid = $USER->id;
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$token->tokentype = EXTERNAL_TOKEN_PERMANENT;
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$token->contextid = context_system::instance()->id;
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$token->creatorid = $USER->id;
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$token->timecreated = time();
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$token->externalserviceid = $service->id;
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// By default tokens are valid for 12 weeks.
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$token->validuntil = $token->timecreated + $CFG->tokenduration;
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$token->iprestriction = null;
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$token->sid = null;
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$token->lastaccess = null;
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// Generate the private token, it must be transmitted only via https.
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$token->privatetoken = random_string(64);
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$token->id = $DB->insert_record('external_tokens', $token);
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$eventtoken = clone $token;
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$eventtoken->privatetoken = null;
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$params = array(
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'objectid' => $eventtoken->id,
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'relateduserid' => $USER->id,
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'other' => array(
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'auto' => true
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)
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);
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$event = \core\event\webservice_token_created::create($params);
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$event->add_record_snapshot('external_tokens', $eventtoken);
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$event->trigger();
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} else {
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throw new moodle_exception('cannotcreatetoken', 'webservice', '', $service->shortname);
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}
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}
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return $token;
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}
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/**
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* Set the last time a token was sent and trigger the \core\event\webservice_token_sent event.
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*
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* This function is used when a token is generated by the user via login/token.php or admin/tool/mobile/launch.php.
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* In order to protect the privatetoken, we remove it from the event params.
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*
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* @param stdClass $token token object
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* @since Moodle 3.2
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*/
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function external_log_token_request($token) {
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global $DB, $USER;
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$token->privatetoken = null;
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|
|
|
// Log token access.
|
|
$DB->set_field('external_tokens', 'lastaccess', time(), array('id' => $token->id));
|
|
|
|
$params = array(
|
|
'objectid' => $token->id,
|
|
);
|
|
$event = \core\event\webservice_token_sent::create($params);
|
|
$event->add_record_snapshot('external_tokens', $token);
|
|
$event->trigger();
|
|
|
|
// Check if we need to notify the user about the new login via token.
|
|
$loginip = getremoteaddr();
|
|
if ($USER->lastip != $loginip &&
|
|
((!WS_SERVER && !CLI_SCRIPT && NO_MOODLE_COOKIES) || PHPUNIT_TEST)) {
|
|
|
|
$logintime = time();
|
|
$useragent = \core_useragent::get_user_agent_string();
|
|
$ismoodleapp = \core_useragent::is_moodle_app();
|
|
|
|
// Schedule adhoc task to sent a login notification to the user.
|
|
$task = new \core\task\send_login_notifications();
|
|
$task->set_userid($USER->id);
|
|
$task->set_custom_data(compact('ismoodleapp', 'useragent', 'loginip', 'logintime'));
|
|
$task->set_component('core');
|
|
// We need sometime so the mobile app will send to Moodle the device information after login.
|
|
$task->set_next_run_time($logintime + (2 * MINSECS));
|
|
\core\task\manager::reschedule_or_queue_adhoc_task($task);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Singleton to handle the external settings.
|
|
*
|
|
* We use singleton to encapsulate the "logic"
|
|
*
|
|
* @package core_webservice
|
|
* @copyright 2012 Jerome Mouneyrac
|
|
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
|
|
* @since Moodle 2.3
|
|
*/
|
|
class external_settings {
|
|
|
|
/** @var object the singleton instance */
|
|
public static $instance = null;
|
|
|
|
/** @var boolean Should the external function return raw text or formatted */
|
|
private $raw = false;
|
|
|
|
/** @var boolean Should the external function filter the text */
|
|
private $filter = false;
|
|
|
|
/** @var boolean Should the external function rewrite plugin file url */
|
|
private $fileurl = true;
|
|
|
|
/** @var string In which file should the urls be rewritten */
|
|
private $file = 'webservice/pluginfile.php';
|
|
|
|
/** @var string The session lang */
|
|
private $lang = '';
|
|
|
|
/** @var string The timezone to use during this WS request */
|
|
private $timezone = '';
|
|
|
|
/**
|
|
* Constructor - protected - can not be instanciated
|
|
*/
|
|
protected function __construct() {
|
|
if ((AJAX_SCRIPT == false) && (CLI_SCRIPT == false) && (WS_SERVER == false)) {
|
|
// For normal pages, the default should match the default for format_text.
|
|
$this->filter = true;
|
|
// Use pluginfile.php for web requests.
|
|
$this->file = 'pluginfile.php';
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Return only one instance
|
|
*
|
|
* @return \external_settings
|
|
*/
|
|
public static function get_instance() {
|
|
if (self::$instance === null) {
|
|
self::$instance = new external_settings;
|
|
}
|
|
|
|
return self::$instance;
|
|
}
|
|
|
|
/**
|
|
* Set raw
|
|
*
|
|
* @param boolean $raw
|
|
*/
|
|
public function set_raw($raw) {
|
|
$this->raw = $raw;
|
|
}
|
|
|
|
/**
|
|
* Get raw
|
|
*
|
|
* @return boolean
|
|
*/
|
|
public function get_raw() {
|
|
return $this->raw;
|
|
}
|
|
|
|
/**
|
|
* Set filter
|
|
*
|
|
* @param boolean $filter
|
|
*/
|
|
public function set_filter($filter) {
|
|
$this->filter = $filter;
|
|
}
|
|
|
|
/**
|
|
* Get filter
|
|
*
|
|
* @return boolean
|
|
*/
|
|
public function get_filter() {
|
|
return $this->filter;
|
|
}
|
|
|
|
/**
|
|
* Set fileurl
|
|
*
|
|
* @param boolean $fileurl
|
|
*/
|
|
public function set_fileurl($fileurl) {
|
|
$this->fileurl = $fileurl;
|
|
}
|
|
|
|
/**
|
|
* Get fileurl
|
|
*
|
|
* @return boolean
|
|
*/
|
|
public function get_fileurl() {
|
|
return $this->fileurl;
|
|
}
|
|
|
|
/**
|
|
* Set file
|
|
*
|
|
* @param string $file
|
|
*/
|
|
public function set_file($file) {
|
|
$this->file = $file;
|
|
}
|
|
|
|
/**
|
|
* Get file
|
|
*
|
|
* @return string
|
|
*/
|
|
public function get_file() {
|
|
return $this->file;
|
|
}
|
|
|
|
/**
|
|
* Set lang
|
|
*
|
|
* @param string $lang
|
|
*/
|
|
public function set_lang($lang) {
|
|
$this->lang = $lang;
|
|
}
|
|
|
|
/**
|
|
* Get lang
|
|
*
|
|
* @return string
|
|
*/
|
|
public function get_lang() {
|
|
return $this->lang;
|
|
}
|
|
|
|
/**
|
|
* Set timezone
|
|
*
|
|
* @param string $timezone
|
|
*/
|
|
public function set_timezone($timezone) {
|
|
$this->timezone = $timezone;
|
|
}
|
|
|
|
/**
|
|
* Get timezone
|
|
*
|
|
* @return string
|
|
*/
|
|
public function get_timezone() {
|
|
return $this->timezone;
|
|
}
|
|
}
|