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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/>.
/**
* 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();
}
}