/lib/classes/update/validator.php
PHP | 644 lines | 334 code | 96 blank | 214 comment | 57 complexity | cb4f24f2eee8565c09bfc480c49290fc MD5 | raw file
Possible License(s): Apache-2.0, LGPL-2.1, BSD-3-Clause, MIT, GPL-3.0
- <?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/>.
- /**
- * Provides validation class to check the plugin ZIP contents
- *
- * Uses fragments of the local_plugins_archive_validator class copyrighted by
- * Marina Glancy that is part of the local_plugins plugin.
- *
- * @package core_plugin
- * @subpackage validation
- * @copyright 2013, 2015 David Mudrak <david@moodle.com>
- * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
- namespace core\update;
- use core_component;
- use core_plugin_manager;
- use help_icon;
- use coding_exception;
- defined('MOODLE_INTERNAL') || die();
- if (!defined('T_ML_COMMENT')) {
- define('T_ML_COMMENT', T_COMMENT);
- } else {
- define('T_DOC_COMMENT', T_ML_COMMENT);
- }
- /**
- * Validates the contents of extracted plugin ZIP file
- *
- * @copyright 2013, 2015 David Mudrak <david@moodle.com>
- * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
- class validator {
- /** Critical error message level, causes the validation fail. */
- const ERROR = 'error';
- /** Warning message level, validation does not fail but the admin should be always informed. */
- const WARNING = 'warning';
- /** Information message level that the admin should be aware of. */
- const INFO = 'info';
- /** Debugging message level, should be displayed in debugging mode only. */
- const DEBUG = 'debug';
- /** @var string full path to the extracted ZIP contents */
- protected $extractdir = null;
- /** @var array as returned by {@link zip_packer::extract_to_pathname()} */
- protected $extractfiles = null;
- /** @var bool overall result of validation */
- protected $result = null;
- /** @var string the name of the plugin root directory */
- protected $rootdir = null;
- /** @var array explicit list of expected/required characteristics of the ZIP */
- protected $assertions = null;
- /** @var array of validation log messages */
- protected $messages = array();
- /** @var array|null array of relevant data obtained from version.php */
- protected $versionphp = null;
- /** @var string|null the name of found English language file without the .php extension */
- protected $langfilename = null;
- /**
- * Factory method returning instance of the validator
- *
- * @param string $zipcontentpath full path to the extracted ZIP contents
- * @param array $zipcontentfiles (string)filerelpath => (bool|string)true or error
- * @return \core\update\validator
- */
- public static function instance($zipcontentpath, array $zipcontentfiles) {
- return new static($zipcontentpath, $zipcontentfiles);
- }
- /**
- * Set the expected plugin type, fail the validation otherwise
- *
- * @param string $required plugin type
- */
- public function assert_plugin_type($required) {
- $this->assertions['plugintype'] = $required;
- }
- /**
- * Set the expectation that the plugin can be installed into the given Moodle version
- *
- * @param string $required Moodle version we are about to install to
- */
- public function assert_moodle_version($required) {
- $this->assertions['moodleversion'] = $required;
- }
- /**
- * Execute the validation process against all explicit and implicit requirements
- *
- * Returns true if the validation passes (all explicit and implicit requirements
- * pass) and the plugin can be installed. Returns false if the validation fails
- * (some explicit or implicit requirement fails) and the plugin must not be
- * installed.
- *
- * @return bool
- */
- public function execute() {
- $this->result = (
- $this->validate_files_layout()
- and $this->validate_version_php()
- and $this->validate_language_pack()
- and $this->validate_target_location()
- );
- return $this->result;
- }
- /**
- * Returns overall result of the validation.
- *
- * Null is returned if the validation has not been executed yet. Otherwise
- * this method returns true (the installation can continue) or false (it is not
- * safe to continue with the installation).
- *
- * @return bool|null
- */
- public function get_result() {
- return $this->result;
- }
- /**
- * Return the list of validation log messages
- *
- * Each validation message is a plain object with properties level, msgcode
- * and addinfo.
- *
- * @return array of (int)index => (stdClass) validation message
- */
- public function get_messages() {
- return $this->messages;
- }
- /**
- * Returns human readable localised name of the given log level.
- *
- * @param string $level e.g. self::INFO
- * @return string
- */
- public function message_level_name($level) {
- return get_string('validationmsglevel_'.$level, 'core_plugin');
- }
- /**
- * If defined, returns human readable validation code.
- *
- * Otherwise, it simply returns the code itself as a fallback.
- *
- * @param string $msgcode
- * @return string
- */
- public function message_code_name($msgcode) {
- $stringman = get_string_manager();
- if ($stringman->string_exists('validationmsg_'.$msgcode, 'core_plugin')) {
- return get_string('validationmsg_'.$msgcode, 'core_plugin');
- }
- return $msgcode;
- }
- /**
- * Returns help icon for the message code if defined.
- *
- * @param string $msgcode
- * @return \help_icon|false
- */
- public function message_help_icon($msgcode) {
- $stringman = get_string_manager();
- if ($stringman->string_exists('validationmsg_'.$msgcode.'_help', 'core_plugin')) {
- return new help_icon('validationmsg_'.$msgcode, 'core_plugin');
- }
- return false;
- }
- /**
- * Localizes the message additional info if it exists.
- *
- * @param string $msgcode
- * @param array|string|null $addinfo value for the $a placeholder in the string
- * @return string
- */
- public function message_code_info($msgcode, $addinfo) {
- $stringman = get_string_manager();
- if ($addinfo !== null and $stringman->string_exists('validationmsg_'.$msgcode.'_info', 'core_plugin')) {
- return get_string('validationmsg_'.$msgcode.'_info', 'core_plugin', $addinfo);
- }
- return '';
- }
- /**
- * Return the information provided by the the plugin's version.php
- *
- * If version.php was not found in the plugin, null is returned. Otherwise
- * the array is returned. It may be empty if no information was parsed
- * (which should not happen).
- *
- * @return null|array
- */
- public function get_versionphp_info() {
- return $this->versionphp;
- }
- /**
- * Returns the name of the English language file without the .php extension
- *
- * This can be used as a suggestion for fixing the plugin root directory in the
- * ZIP file during the upload. If no file was found, or multiple PHP files are
- * located in lang/en/ folder, then null is returned.
- *
- * @return null|string
- */
- public function get_language_file_name() {
- return $this->langfilename;
- }
- /**
- * Returns the rootdir of the extracted package (after eventual renaming)
- *
- * @return string|null
- */
- public function get_rootdir() {
- return $this->rootdir;
- }
- // End of external API.
- /**
- * No public constructor, use {@link self::instance()} instead.
- *
- * @param string $zipcontentpath full path to the extracted ZIP contents
- * @param array $zipcontentfiles (string)filerelpath => (bool|string)true or error
- */
- protected function __construct($zipcontentpath, array $zipcontentfiles) {
- $this->extractdir = $zipcontentpath;
- $this->extractfiles = $zipcontentfiles;
- }
- // Validation methods.
- /**
- * Returns false if files in the ZIP do not have required layout.
- *
- * @return bool
- */
- protected function validate_files_layout() {
- if (!is_array($this->extractfiles) or count($this->extractfiles) < 4) {
- // We need the English language pack with the name of the plugin at least.
- $this->add_message(self::ERROR, 'filesnumber');
- return false;
- }
- foreach ($this->extractfiles as $filerelname => $filestatus) {
- if ($filestatus !== true) {
- $this->add_message(self::ERROR, 'filestatus', array('file' => $filerelname, 'status' => $filestatus));
- return false;
- }
- }
- foreach (array_keys($this->extractfiles) as $filerelname) {
- if (!file_exists($this->extractdir.'/'.$filerelname)) {
- $this->add_message(self::ERROR, 'filenotexists', array('file' => $filerelname));
- return false;
- }
- }
- foreach (array_keys($this->extractfiles) as $filerelname) {
- $matches = array();
- if (!preg_match("#^([^/]+)/#", $filerelname, $matches)
- or (!is_null($this->rootdir) and $this->rootdir !== $matches[1])) {
- $this->add_message(self::ERROR, 'onedir');
- return false;
- }
- $this->rootdir = $matches[1];
- }
- if ($this->rootdir !== clean_param($this->rootdir, PARAM_PLUGIN)) {
- $this->add_message(self::ERROR, 'rootdirinvalid', $this->rootdir);
- return false;
- } else {
- $this->add_message(self::INFO, 'rootdir', $this->rootdir);
- }
- return is_dir($this->extractdir.'/'.$this->rootdir);
- }
- /**
- * Returns false if the version.php file does not declare required information.
- *
- * @return bool
- */
- protected function validate_version_php() {
- if (!isset($this->assertions['plugintype'])) {
- throw new coding_exception('Required plugin type must be set before calling this');
- }
- if (!isset($this->assertions['moodleversion'])) {
- throw new coding_exception('Required Moodle version must be set before calling this');
- }
- $fullpath = $this->extractdir.'/'.$this->rootdir.'/version.php';
- if (!file_exists($fullpath)) {
- // This is tolerated for themes only.
- if ($this->assertions['plugintype'] === 'theme') {
- $this->add_message(self::DEBUG, 'missingversionphp');
- return true;
- } else {
- $this->add_message(self::ERROR, 'missingversionphp');
- return false;
- }
- }
- $this->versionphp = array();
- $info = $this->parse_version_php($fullpath);
- if (isset($info['module->version'])) {
- $this->add_message(self::ERROR, 'versionphpsyntax', '$module');
- return false;
- }
- if (isset($info['plugin->version'])) {
- $this->versionphp['version'] = $info['plugin->version'];
- $this->add_message(self::INFO, 'pluginversion', $this->versionphp['version']);
- } else {
- $this->add_message(self::ERROR, 'missingversion');
- return false;
- }
- if (isset($info['plugin->requires'])) {
- $this->versionphp['requires'] = $info['plugin->requires'];
- if ($this->versionphp['requires'] > $this->assertions['moodleversion']) {
- $this->add_message(self::ERROR, 'requiresmoodle', $this->versionphp['requires']);
- return false;
- }
- $this->add_message(self::INFO, 'requiresmoodle', $this->versionphp['requires']);
- }
- if (!isset($info['plugin->component'])) {
- $this->add_message(self::ERROR, 'missingcomponent');
- return false;
- }
- $this->versionphp['component'] = $info['plugin->component'];
- list($reqtype, $reqname) = core_component::normalize_component($this->versionphp['component']);
- if ($reqtype !== $this->assertions['plugintype']) {
- $this->add_message(self::ERROR, 'componentmismatchtype', array(
- 'expected' => $this->assertions['plugintype'],
- 'found' => $reqtype));
- return false;
- }
- if ($reqname !== $this->rootdir) {
- $this->add_message(self::ERROR, 'componentmismatchname', $reqname);
- return false;
- }
- $this->add_message(self::INFO, 'componentmatch', $this->versionphp['component']);
- // Ensure the version we are uploading is higher than the version currently installed.
- $plugininfo = $this->get_plugin_manager()->get_plugin_info($this->versionphp['component']);
- if (!is_null($plugininfo) && $this->versionphp['version'] < $plugininfo->versiondb) {
- $this->add_message(self::ERROR, 'pluginversiontoolow', $plugininfo->versiondb);
- return false;
- }
- if (isset($info['plugin->maturity'])) {
- $this->versionphp['maturity'] = $info['plugin->maturity'];
- if ($this->versionphp['maturity'] === 'MATURITY_STABLE') {
- $this->add_message(self::INFO, 'maturity', $this->versionphp['maturity']);
- } else {
- $this->add_message(self::WARNING, 'maturity', $this->versionphp['maturity']);
- }
- }
- if (isset($info['plugin->release'])) {
- $this->versionphp['release'] = $info['plugin->release'];
- $this->add_message(self::INFO, 'release', $this->versionphp['release']);
- }
- return true;
- }
- /**
- * Returns false if the English language pack is not provided correctly.
- *
- * @return bool
- */
- protected function validate_language_pack() {
- if (!isset($this->assertions['plugintype'])) {
- throw new coding_exception('Required plugin type must be set before calling this');
- }
- if (!isset($this->extractfiles[$this->rootdir.'/lang/en/'])
- or $this->extractfiles[$this->rootdir.'/lang/en/'] !== true
- or !is_dir($this->extractdir.'/'.$this->rootdir.'/lang/en')) {
- $this->add_message(self::ERROR, 'missinglangenfolder');
- return false;
- }
- $langfiles = array();
- foreach (array_keys($this->extractfiles) as $extractfile) {
- $matches = array();
- if (preg_match('#^'.preg_quote($this->rootdir).'/lang/en/([^/]+).php?$#i', $extractfile, $matches)) {
- $langfiles[] = $matches[1];
- }
- }
- if (empty($langfiles)) {
- $this->add_message(self::ERROR, 'missinglangenfile');
- return false;
- } else if (count($langfiles) > 1) {
- $this->add_message(self::WARNING, 'multiplelangenfiles');
- } else {
- $this->langfilename = $langfiles[0];
- $this->add_message(self::DEBUG, 'foundlangfile', $this->langfilename);
- }
- if ($this->assertions['plugintype'] === 'mod') {
- $expected = $this->rootdir.'.php';
- } else {
- $expected = $this->assertions['plugintype'].'_'.$this->rootdir.'.php';
- }
- if (!isset($this->extractfiles[$this->rootdir.'/lang/en/'.$expected])
- or $this->extractfiles[$this->rootdir.'/lang/en/'.$expected] !== true
- or !is_file($this->extractdir.'/'.$this->rootdir.'/lang/en/'.$expected)) {
- $this->add_message(self::ERROR, 'missingexpectedlangenfile', $expected);
- return false;
- }
- return true;
- }
- /**
- * Returns false of the given add-on can't be installed into its location.
- *
- * @return bool
- */
- public function validate_target_location() {
- if (!isset($this->assertions['plugintype'])) {
- throw new coding_exception('Required plugin type must be set before calling this');
- }
- $plugintypepath = $this->get_plugintype_location($this->assertions['plugintype']);
- if (is_null($plugintypepath)) {
- $this->add_message(self::ERROR, 'unknowntype', $this->assertions['plugintype']);
- return false;
- }
- if (!is_dir($plugintypepath)) {
- throw new coding_exception('Plugin type location does not exist!');
- }
- // Always check that the plugintype root is writable.
- if (!is_writable($plugintypepath)) {
- $this->add_message(self::ERROR, 'pathwritable', $plugintypepath);
- return false;
- } else {
- $this->add_message(self::INFO, 'pathwritable', $plugintypepath);
- }
- // The target location itself may or may not exist. Even if installing an
- // available update, the code could have been removed by accident (and
- // be reported as missing) etc. So we just make sure that the code
- // can be replaced if it already exists.
- $target = $plugintypepath.'/'.$this->rootdir;
- if (file_exists($target)) {
- if (!is_dir($target)) {
- $this->add_message(self::ERROR, 'targetnotdir', $target);
- return false;
- }
- $this->add_message(self::WARNING, 'targetexists', $target);
- if ($this->get_plugin_manager()->is_directory_removable($target)) {
- $this->add_message(self::INFO, 'pathwritable', $target);
- } else {
- $this->add_message(self::ERROR, 'pathwritable', $target);
- return false;
- }
- }
- return true;
- }
- // Helper methods.
- /**
- * Get as much information from existing version.php as possible
- *
- * @param string $fullpath full path to the version.php file
- * @return array of found meta-info declarations
- */
- protected function parse_version_php($fullpath) {
- $content = $this->get_stripped_file_contents($fullpath);
- preg_match_all('#\$((plugin|module)\->(version|maturity|release|requires))=()(\d+(\.\d+)?);#m', $content, $matches1);
- preg_match_all('#\$((plugin|module)\->(maturity))=()(MATURITY_\w+);#m', $content, $matches2);
- preg_match_all('#\$((plugin|module)\->(release))=([\'"])(.*?)\4;#m', $content, $matches3);
- preg_match_all('#\$((plugin|module)\->(component))=([\'"])(.+?_.+?)\4;#m', $content, $matches4);
- if (count($matches1[1]) + count($matches2[1]) + count($matches3[1]) + count($matches4[1])) {
- $info = array_combine(
- array_merge($matches1[1], $matches2[1], $matches3[1], $matches4[1]),
- array_merge($matches1[5], $matches2[5], $matches3[5], $matches4[5])
- );
- } else {
- $info = array();
- }
- return $info;
- }
- /**
- * Append the given message to the messages log
- *
- * @param string $level e.g. self::ERROR
- * @param string $msgcode may form a string
- * @param string|array|object $a optional additional info suitable for {@link get_string()}
- */
- protected function add_message($level, $msgcode, $a = null) {
- $msg = (object)array(
- 'level' => $level,
- 'msgcode' => $msgcode,
- 'addinfo' => $a,
- );
- $this->messages[] = $msg;
- }
- /**
- * Returns bare PHP code from the given file
- *
- * Returns contents without PHP opening and closing tags, text outside php code,
- * comments and extra whitespaces.
- *
- * @param string $fullpath full path to the file
- * @return string
- */
- protected function get_stripped_file_contents($fullpath) {
- $source = file_get_contents($fullpath);
- $tokens = token_get_all($source);
- $output = '';
- $doprocess = false;
- foreach ($tokens as $token) {
- if (is_string($token)) {
- // Simple one character token.
- $id = -1;
- $text = $token;
- } else {
- // Token array.
- list($id, $text) = $token;
- }
- switch ($id) {
- case T_WHITESPACE:
- case T_COMMENT:
- case T_ML_COMMENT:
- case T_DOC_COMMENT:
- // Ignore whitespaces, inline comments, multiline comments and docblocks.
- break;
- case T_OPEN_TAG:
- // Start processing.
- $doprocess = true;
- break;
- case T_CLOSE_TAG:
- // Stop processing.
- $doprocess = false;
- break;
- default:
- // Anything else is within PHP tags, return it as is.
- if ($doprocess) {
- $output .= $text;
- if ($text === 'function') {
- // Explicitly keep the whitespace that would be ignored.
- $output .= ' ';
- }
- }
- break;
- }
- }
- return $output;
- }
- /**
- * Returns the full path to the root directory of the given plugin type.
- *
- * @param string $plugintype
- * @return string|null
- */
- public function get_plugintype_location($plugintype) {
- return $this->get_plugin_manager()->get_plugintype_root($plugintype);
- }
- /**
- * Returns plugin manager to use.
- *
- * @return core_plugin_manager
- */
- protected function get_plugin_manager() {
- return core_plugin_manager::instance();
- }
- }