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setuplib.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/>.
/**
* These functions are required very early in the Moodle
* setup process, before any of the main libraries are
* loaded.
*
* @package core
* @subpackage lib
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
// Debug levels - always keep the values in ascending order!
/** No warnings and errors at all */
define('DEBUG_NONE', 0);
/** Fatal errors only */
define('DEBUG_MINIMAL', E_ERROR | E_PARSE);
/** Errors, warnings and notices */
define('DEBUG_NORMAL', E_ERROR | E_PARSE | E_WARNING | E_NOTICE);
/** All problems except strict PHP warnings */
define('DEBUG_ALL', E_ALL & ~E_STRICT);
/** DEBUG_ALL with all debug messages and strict warnings */
define('DEBUG_DEVELOPER', E_ALL | E_STRICT);
/** Remove any memory limits */
define('MEMORY_UNLIMITED', -1);
/** Standard memory limit for given platform */
define('MEMORY_STANDARD', -2);
/**
* Large memory limit for given platform - used in cron, upgrade, and other places that need a lot of memory.
* Can be overridden with $CFG->extramemorylimit setting.
*/
define('MEMORY_EXTRA', -3);
/** Extremely large memory limit - not recommended for standard scripts */
define('MEMORY_HUGE', -4);
/**
* Base Moodle Exception class
*
* Although this class is defined here, you cannot throw a moodle_exception until
* after moodlelib.php has been included (which will happen very soon).
*
* @package core
* @subpackage lib
* @copyright 2008 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class moodle_exception extends Exception {
/**
* @var string The name of the string from error.php to print
*/
public $errorcode;
/**
* @var string The name of module
*/
public $module;
/**
* @var mixed Extra words and phrases that might be required in the error string
*/
public $a;
/**
* @var string The url where the user will be prompted to continue. If no url is provided the user will be directed to the site index page.
*/
public $link;
/**
* @var string Optional information to aid the debugging process
*/
public $debuginfo;
/**
* Constructor
* @param string $errorcode The name of the string from error.php to print
* @param string $module name of module
* @param string $link The url where the user will be prompted to continue. If no url is provided the user will be directed to the site index page.
* @param mixed $a Extra words and phrases that might be required in the error string
* @param string $debuginfo optional debugging information
*/
function __construct($errorcode, $module='', $link='', $a=NULL, $debuginfo=null) {
if (empty($module) || $module == 'moodle' || $module == 'core') {
$module = 'error';
}
$this->errorcode = $errorcode;
$this->module = $module;
$this->link = $link;
$this->a = $a;
$this->debuginfo = is_null($debuginfo) ? null : (string)$debuginfo;
if (get_string_manager()->string_exists($errorcode, $module)) {
$message = get_string($errorcode, $module, $a);
$haserrorstring = true;
} else {
$message = $module . '/' . $errorcode;
$haserrorstring = false;
}
if (defined('PHPUNIT_TEST') and PHPUNIT_TEST and $debuginfo) {
$message = "$message ($debuginfo)";
}
if (!$haserrorstring and defined('PHPUNIT_TEST') and PHPUNIT_TEST) {
// Append the contents of $a to $debuginfo so helpful information isn't lost.
// This emulates what {@link get_exception_info()} does. Unfortunately that
// function is not used by phpunit.
$message .= PHP_EOL.'$a contents: '.print_r($a, true);
}
parent::__construct($message, 0);
}
}
/**
* Course/activity access exception.
*
* This exception is thrown from require_login()
*
* @package core_access
* @copyright 2010 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class require_login_exception extends moodle_exception {
/**
* Constructor
* @param string $debuginfo Information to aid the debugging process
*/
function __construct($debuginfo) {
parent::__construct('requireloginerror', 'error', '', NULL, $debuginfo);
}
}
/**
* Session timeout exception.
*
* This exception is thrown from require_login()
*
* @package core_access
* @copyright 2015 Andrew Nicols <[email protected]>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class require_login_session_timeout_exception extends require_login_exception {
/**
* Constructor
*/
public function __construct() {
moodle_exception::__construct('sessionerroruser', 'error');
}
}
/**
* Web service parameter exception class
* @deprecated since Moodle 2.2 - use moodle exception instead
* This exception must be thrown to the web service client when a web service parameter is invalid
* The error string is gotten from webservice.php
*/
class webservice_parameter_exception extends moodle_exception {
/**
* Constructor
* @param string $errorcode The name of the string from webservice.php to print
* @param string $a The name of the parameter
* @param string $debuginfo Optional information to aid debugging
*/
function __construct($errorcode=null, $a = '', $debuginfo = null) {
parent::__construct($errorcode, 'webservice', '', $a, $debuginfo);
}
}
/**
* Exceptions indicating user does not have permissions to do something
* and the execution can not continue.
*
* @package core_access
* @copyright 2009 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class required_capability_exception extends moodle_exception {
/**
* Constructor
* @param context $context The context used for the capability check
* @param string $capability The required capability
* @param string $errormessage The error message to show the user
* @param string $stringfile
*/
function __construct($context, $capability, $errormessage, $stringfile) {
$capabilityname = get_capability_string($capability);
if ($context->contextlevel == CONTEXT_MODULE and preg_match('/:view$/', $capability)) {
// we can not go to mod/xx/view.php because we most probably do not have cap to view it, let's go to course instead
$parentcontext = $context->get_parent_context();
$link = $parentcontext->get_url();
} else {
$link = $context->get_url();
}
parent::__construct($errormessage, $stringfile, $link, $capabilityname);
}
}
/**
* Exception indicating programming error, must be fixed by a programer. For example
* a core API might throw this type of exception if a plugin calls it incorrectly.
*
* @package core
* @subpackage lib
* @copyright 2008 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class coding_exception extends moodle_exception {
/**
* Constructor
* @param string $hint short description of problem
* @param string $debuginfo detailed information how to fix problem
*/
function __construct($hint, $debuginfo=null) {
parent::__construct('codingerror', 'debug', '', $hint, $debuginfo);
}
}
/**
* Exception indicating malformed parameter problem.
* This exception is not supposed to be thrown when processing
* user submitted data in forms. It is more suitable
* for WS and other low level stuff.
*
* @package core
* @subpackage lib
* @copyright 2009 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class invalid_parameter_exception extends moodle_exception {
/**
* Constructor
* @param string $debuginfo some detailed information
*/
function __construct($debuginfo=null) {
parent::__construct('invalidparameter', 'debug', '', null, $debuginfo);
}
}
/**
* Exception indicating malformed response problem.
* This exception is not supposed to be thrown when processing
* user submitted data in forms. It is more suitable
* for WS and other low level stuff.
*/
class invalid_response_exception extends moodle_exception {
/**
* Constructor
* @param string $debuginfo some detailed information
*/
function __construct($debuginfo=null) {
parent::__construct('invalidresponse', 'debug', '', null, $debuginfo);
}
}
/**
* An exception that indicates something really weird happened. For example,
* if you do switch ($context->contextlevel), and have one case for each
* CONTEXT_... constant. You might throw an invalid_state_exception in the
* default case, to just in case something really weird is going on, and
* $context->contextlevel is invalid - rather than ignoring this possibility.
*
* @package core
* @subpackage lib
* @copyright 2009 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class invalid_state_exception extends moodle_exception {
/**
* Constructor
* @param string $hint short description of problem
* @param string $debuginfo optional more detailed information
*/
function __construct($hint, $debuginfo=null) {
parent::__construct('invalidstatedetected', 'debug', '', $hint, $debuginfo);
}
}
/**
* An exception that indicates incorrect permissions in $CFG->dataroot
*
* @package core
* @subpackage lib
* @copyright 2010 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class invalid_dataroot_permissions extends moodle_exception {
/**
* Constructor
* @param string $debuginfo optional more detailed information
*/
function __construct($debuginfo = NULL) {
parent::__construct('invaliddatarootpermissions', 'error', '', NULL, $debuginfo);
}
}
/**
* An exception that indicates that file can not be served
*
* @package core
* @subpackage lib
* @copyright 2010 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class file_serving_exception extends moodle_exception {
/**
* Constructor
* @param string $debuginfo optional more detailed information
*/
function __construct($debuginfo = NULL) {
parent::__construct('cannotservefile', 'error', '', NULL, $debuginfo);
}
}
/**
* Default exception handler.
*
* @param Exception $ex
* @return void -does not return. Terminates execution!
*/
function default_exception_handler($ex) {
global $CFG, $DB, $OUTPUT, $USER, $FULLME, $SESSION, $PAGE;
// detect active db transactions, rollback and log as error
abort_all_db_transactions();
if (($ex instanceof required_capability_exception) && !CLI_SCRIPT && !AJAX_SCRIPT && !empty($CFG->autologinguests) && !empty($USER->autologinguest)) {
$SESSION->wantsurl = qualified_me();
redirect(get_login_url());
}
$info = get_exception_info($ex);
if (debugging('', DEBUG_MINIMAL)) {
$logerrmsg = "Default exception handler: ".$info->message.' Debug: '.$info->debuginfo."\n".format_backtrace($info->backtrace, true);
error_log($logerrmsg);
}
if (is_early_init($info->backtrace)) {
echo bootstrap_renderer::early_error($info->message, $info->moreinfourl, $info->link, $info->backtrace, $info->debuginfo, $info->errorcode);
} else {
try {
if ($DB) {
// If you enable db debugging and exception is thrown, the print footer prints a lot of rubbish
$DB->set_debug(0);
}
if (AJAX_SCRIPT) {
// If we are in an AJAX script we don't want to use PREFERRED_RENDERER_TARGET.
// Because we know we will want to use ajax format.
$renderer = new core_renderer_ajax($PAGE, 'ajax');
} else {
$renderer = $OUTPUT;
}
echo $renderer->fatal_error($info->message, $info->moreinfourl, $info->link, $info->backtrace, $info->debuginfo,
$info->errorcode);
} catch (Exception $e) {
$out_ex = $e;
} catch (Throwable $e) {
// Engine errors in PHP7 throw exceptions of type Throwable (this "catch" will be ignored in PHP5).
$out_ex = $e;
}
if (isset($out_ex)) {
// default exception handler MUST not throw any exceptions!!
// the problem here is we do not know if page already started or not, we only know that somebody messed up in outputlib or theme
// so we just print at least something instead of "Exception thrown without a stack frame in Unknown on line 0":-(
if (CLI_SCRIPT or AJAX_SCRIPT) {
// just ignore the error and send something back using the safest method
echo bootstrap_renderer::early_error($info->message, $info->moreinfourl, $info->link, $info->backtrace, $info->debuginfo, $info->errorcode);
} else {
echo bootstrap_renderer::early_error_content($info->message, $info->moreinfourl, $info->link, $info->backtrace, $info->debuginfo);
$outinfo = get_exception_info($out_ex);
echo bootstrap_renderer::early_error_content($outinfo->message, $outinfo->moreinfourl, $outinfo->link, $outinfo->backtrace, $outinfo->debuginfo);
}
}
}
exit(1); // General error code
}
/**
* Default error handler, prevents some white screens.
* @param int $errno
* @param string $errstr
* @param string $errfile
* @param int $errline
* @param array $errcontext
* @return bool false means use default error handler
*/
function default_error_handler($errno, $errstr, $errfile, $errline, $errcontext) {
if ($errno == 4096) {
//fatal catchable error
throw new coding_exception('PHP catchable fatal error', $errstr);
}
return false;
}
/**
* Unconditionally abort all database transactions, this function
* should be called from exception handlers only.
* @return void
*/
function abort_all_db_transactions() {
global $CFG, $DB, $SCRIPT;
// default exception handler MUST not throw any exceptions!!
if ($DB && $DB->is_transaction_started()) {
error_log('Database transaction aborted automatically in ' . $CFG->dirroot . $SCRIPT);
// note: transaction blocks should never change current $_SESSION
$DB->force_transaction_rollback();
}
}
/**
* This function encapsulates the tests for whether an exception was thrown in
* early init -- either during setup.php or during init of $OUTPUT.
*
* If another exception is thrown then, and if we do not take special measures,
* we would just get a very cryptic message "Exception thrown without a stack
* frame in Unknown on line 0". That makes debugging very hard, so we do take
* special measures in default_exception_handler, with the help of this function.
*
* @param array $backtrace the stack trace to analyse.
* @return boolean whether the stack trace is somewhere in output initialisation.
*/
function is_early_init($backtrace) {
$dangerouscode = array(
array('function' => 'header', 'type' => '->'),
array('class' => 'bootstrap_renderer'),
array('file' => __DIR__.'/setup.php'),
);
foreach ($backtrace as $stackframe) {
foreach ($dangerouscode as $pattern) {
$matches = true;
foreach ($pattern as $property => $value) {
if (!isset($stackframe[$property]) || $stackframe[$property] != $value) {
$matches = false;
}
}
if ($matches) {
return true;
}
}
}
return false;
}
/**
* Abort execution by throwing of a general exception,
* default exception handler displays the error message in most cases.
*
* @param string $errorcode The name of the language string containing the error message.
* Normally this should be in the error.php lang file.
* @param string $module The language file to get the error message from.
* @param string $link The url where the user will be prompted to continue.
* If no url is provided the user will be directed to the site index page.
* @param object $a Extra words and phrases that might be required in the error string
* @param string $debuginfo optional debugging information
* @return void, always throws exception!
*/
function print_error($errorcode, $module = 'error', $link = '', $a = null, $debuginfo = null) {
throw new moodle_exception($errorcode, $module, $link, $a, $debuginfo);
}
/**
* Returns detailed information about specified exception.
* @param exception $ex
* @return object
*/
function get_exception_info($ex) {
global $CFG, $DB, $SESSION;
if ($ex instanceof moodle_exception) {
$errorcode = $ex->errorcode;
$module = $ex->module;
$a = $ex->a;
$link = $ex->link;
$debuginfo = $ex->debuginfo;
} else {
$errorcode = 'generalexceptionmessage';
$module = 'error';
$a = $ex->getMessage();
$link = '';
$debuginfo = '';
}
// Append the error code to the debug info to make grepping and googling easier
$debuginfo .= PHP_EOL."Error code: $errorcode";
$backtrace = $ex->getTrace();
$place = array('file'=>$ex->getFile(), 'line'=>$ex->getLine(), 'exception'=>get_class($ex));
array_unshift($backtrace, $place);
// Be careful, no guarantee moodlelib.php is loaded.
if (empty($module) || $module == 'moodle' || $module == 'core') {
$module = 'error';
}
// Search for the $errorcode's associated string
// If not found, append the contents of $a to $debuginfo so helpful information isn't lost
if (function_exists('get_string_manager')) {
if (get_string_manager()->string_exists($errorcode, $module)) {
$message = get_string($errorcode, $module, $a);
} elseif ($module == 'error' && get_string_manager()->string_exists($errorcode, 'moodle')) {
// Search in moodle file if error specified - needed for backwards compatibility
$message = get_string($errorcode, 'moodle', $a);
} else {
$message = $module . '/' . $errorcode;
$debuginfo .= PHP_EOL.'$a contents: '.print_r($a, true);
}
} else {
$message = $module . '/' . $errorcode;
$debuginfo .= PHP_EOL.'$a contents: '.print_r($a, true);
}
// Remove some absolute paths from message and debugging info.
$searches = array();
$replaces = array();
$cfgnames = array('tempdir', 'cachedir', 'localcachedir', 'themedir', 'dataroot', 'dirroot');
foreach ($cfgnames as $cfgname) {
if (property_exists($CFG, $cfgname)) {
$searches[] = $CFG->$cfgname;
$replaces[] = "[$cfgname]";
}
}
if (!empty($searches)) {
$message = str_replace($searches, $replaces, $message);
$debuginfo = str_replace($searches, $replaces, $debuginfo);
}
// Be careful, no guarantee weblib.php is loaded.
if (function_exists('clean_text')) {
$message = clean_text($message);
} else {
$message = htmlspecialchars($message);
}
if (!empty($CFG->errordocroot)) {
$errordoclink = $CFG->errordocroot . '/en/';
} else {
$errordoclink = get_docs_url();
}
if ($module === 'error') {
$modulelink = 'moodle';
} else {
$modulelink = $module;
}
$moreinfourl = $errordoclink . 'error/' . $modulelink . '/' . $errorcode;
if (empty($link)) {
if (!empty($SESSION->fromurl)) {
$link = $SESSION->fromurl;
unset($SESSION->fromurl);
} else {
$link = $CFG->wwwroot .'/';
}
}
// When printing an error the continue button should never link offsite.
// We cannot use clean_param() here as it is not guaranteed that it has been loaded yet.
if (stripos($link, $CFG->wwwroot) === 0) {
// Internal HTTP, all good.
} else {
// External link spotted!
$link = $CFG->wwwroot . '/';
}
$info = new stdClass();
$info->message = $message;
$info->errorcode = $errorcode;
$info->backtrace = $backtrace;
$info->link = $link;
$info->moreinfourl = $moreinfourl;
$info->a = $a;
$info->debuginfo = $debuginfo;
return $info;
}
/**
* Generate a uuid.
*
* Unique is hard. Very hard. Attempt to use the PECL UUID functions if available, and if not then revert to
* constructing the uuid using mt_rand.
*
* It is important that this token is not solely based on time as this could lead
* to duplicates in a clustered environment (especially on VMs due to poor time precision).
*
* @return string The uuid.
*/
function generate_uuid() {
$uuid = '';
if (function_exists("uuid_create")) {
$context = null;
uuid_create($context);
uuid_make($context, UUID_MAKE_V4);
uuid_export($context, UUID_FMT_STR, $uuid);
} else {
// Fallback uuid generation based on:
// "http://www.php.net/manual/en/function.uniqid.php#94959".
$uuid = sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
// 32 bits for "time_low".
mt_rand(0, 0xffff), mt_rand(0, 0xffff),
// 16 bits for "time_mid".
mt_rand(0, 0xffff),
// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 4.
mt_rand(0, 0x0fff) | 0x4000,
// 16 bits, 8 bits for "clk_seq_hi_res",
// 8 bits for "clk_seq_low",
// two most significant bits holds zero and one for variant DCE1.1.
mt_rand(0, 0x3fff) | 0x8000,
// 48 bits for "node".
mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff));
}
return trim($uuid);
}
/**
* Returns the Moodle Docs URL in the users language for a given 'More help' link.
*
* There are three cases:
*
* 1. In the normal case, $path will be a short relative path 'component/thing',
* like 'mod/folder/view' 'group/import'. This gets turned into an link to
* MoodleDocs in the user's language, and for the appropriate Moodle version.
* E.g. 'group/import' may become 'http://docs.moodle.org/2x/en/group/import'.
* The 'http://docs.moodle.org' bit comes from $CFG->docroot.
*
* This is the only option that should be used in standard Moodle code. The other
* two options have been implemented because they are useful for third-party plugins.
*
* 2. $path may be an absolute URL, starting http:// or https://. In this case,
* the link is used as is.
*
* 3. $path may start %%WWWROOT%%, in which case that is replaced by
* $CFG->wwwroot to make the link.
*
* @param string $path the place to link to. See above for details.
* @return string The MoodleDocs URL in the user's language. for example @link http://docs.moodle.org/2x/en/$path}
*/
function get_docs_url($path = null) {
global $CFG;
// Absolute URLs are used unmodified.
if (substr($path, 0, 7) === 'http://' || substr($path, 0, 8) === 'https://') {
return $path;
}
// Paths starting %%WWWROOT%% have that replaced by $CFG->wwwroot.
if (substr($path, 0, 11) === '%%WWWROOT%%') {
return $CFG->wwwroot . substr($path, 11);
}
// Otherwise we do the normal case, and construct a MoodleDocs URL relative to $CFG->docroot.
// Check that $CFG->branch has been set up, during installation it won't be.
if (empty($CFG->branch)) {
// It's not there yet so look at version.php.
include($CFG->dirroot.'/version.php');
} else {
// We can use $CFG->branch and avoid having to include version.php.
$branch = $CFG->branch;
}
// ensure branch is valid.
if (!$branch) {
// We should never get here but in case we do lets set $branch to .
// the smart one's will know that this is the current directory
// and the smarter ones will know that there is some smart matching
// that will ensure people end up at the latest version of the docs.
$branch = '.';
}
if (empty($CFG->doclang)) {
$lang = current_language();
} else {
$lang = $CFG->doclang;
}
$end = '/' . $branch . '/' . $lang . '/' . $path;
if (empty($CFG->docroot)) {
return 'http://docs.moodle.org'. $end;
} else {
return $CFG->docroot . $end ;
}
}
/**
* Formats a backtrace ready for output.
*
* This function does not include function arguments because they could contain sensitive information
* not suitable to be exposed in a response.
*
* @param array $callers backtrace array, as returned by debug_backtrace().
* @param boolean $plaintext if false, generates HTML, if true generates plain text.
* @return string formatted backtrace, ready for output.
*/
function format_backtrace($callers, $plaintext = false) {
// do not use $CFG->dirroot because it might not be available in destructors
$dirroot = dirname(__DIR__);
if (empty($callers)) {
return '';
}
$from = $plaintext ? '' : '<ul style="text-align: left" data-rel="backtrace">';
foreach ($callers as $caller) {
if (!isset($caller['line'])) {
$caller['line'] = '?'; // probably call_user_func()
}
if (!isset($caller['file'])) {
$caller['file'] = 'unknownfile'; // probably call_user_func()
}
$from .= $plaintext ? '* ' : '<li>';
$from .= 'line ' . $caller['line'] . ' of ' . str_replace($dirroot, '', $caller['file']);
if (isset($caller['function'])) {
$from .= ': call to ';
if (isset($caller['class'])) {
$from .= $caller['class'] . $caller['type'];
}
$from .= $caller['function'] . '()';
} else if (isset($caller['exception'])) {
$from .= ': '.$caller['exception'].' thrown';
}
$from .= $plaintext ? "\n" : '</li>';
}
$from .= $plaintext ? '' : '</ul>';
return $from;
}
/**
* This function makes the return value of ini_get consistent if you are
* setting server directives through the .htaccess file in apache.
*
* Current behavior for value set from php.ini On = 1, Off = [blank]
* Current behavior for value set from .htaccess On = On, Off = Off
* Contributed by jdell @ unr.edu
*
* @param string $ini_get_arg The argument to get
* @return bool True for on false for not
*/
function ini_get_bool($ini_get_arg) {
$temp = ini_get($ini_get_arg);
if ($temp == '1' or strtolower($temp) == 'on') {
return true;
}
return false;
}
/**
* This function verifies the sanity of PHP configuration
* and stops execution if anything critical found.
*/
function setup_validate_php_configuration() {
// this must be very fast - no slow checks here!!!
if (ini_get_bool('session.auto_start')) {
print_error('sessionautostartwarning', 'admin');
}
}
/**
* Initialise global $CFG variable.
* @private to be used only from lib/setup.php
*/
function initialise_cfg() {
global $CFG, $DB;
if (!$DB) {
// This should not happen.
return;
}
try {
$localcfg = get_config('core');
} catch (dml_exception $e) {
// Most probably empty db, going to install soon.
return;
}
foreach ($localcfg as $name => $value) {
// Note that get_config() keeps forced settings
// and normalises values to string if possible.
$CFG->{$name} = $value;
}
}
/**
* Initialises $FULLME and friends. Private function. Should only be called from
* setup.php.
*/
function initialise_fullme() {
global $CFG, $FULLME, $ME, $SCRIPT, $FULLSCRIPT;
// Detect common config error.
if (substr($CFG->wwwroot, -1) == '/') {
print_error('wwwrootslash', 'error');
}
if (CLI_SCRIPT) {
initialise_fullme_cli();
return;
}
if (!empty($CFG->overridetossl)) {
if (strpos($CFG->wwwroot, 'http://') === 0) {
$CFG->wwwroot = str_replace('http:', 'https:', $CFG->wwwroot);
} else {
unset_config('overridetossl');
}
}
$rurl = setup_get_remote_url();
$wwwroot = parse_url($CFG->wwwroot.'/');
if (empty($rurl['host'])) {
// missing host in request header, probably not a real browser, let's ignore them
} else if (!empty($CFG->reverseproxy)) {
// $CFG->reverseproxy specifies if reverse proxy server used
// Used in load balancing scenarios.
// Do not abuse this to try to solve lan/wan access problems!!!!!
} else {
if (($rurl['host'] !== $wwwroot['host']) or
(!empty($wwwroot['port']) and $rurl['port'] != $wwwroot['port']) or
(strpos($rurl['path'], $wwwroot['path']) !== 0)) {
// Explain the problem and redirect them to the right URL
if (!defined('NO_MOODLE_COOKIES')) {
define('NO_MOODLE_COOKIES', true);
}
// The login/token.php script should call the correct url/port.
if (defined('REQUIRE_CORRECT_ACCESS') && REQUIRE_CORRECT_ACCESS) {
$wwwrootport = empty($wwwroot['port'])?'':$wwwroot['port'];
$calledurl = $rurl['host'];
if (!empty($rurl['port'])) {
$calledurl .= ':'. $rurl['port'];
}
$correcturl = $wwwroot['host'];
if (!empty($wwwrootport)) {
$correcturl .= ':'. $wwwrootport;
}
throw new moodle_exception('requirecorrectaccess', 'error', '', null,
'You called ' . $calledurl .', you should have called ' . $correcturl);
}
redirect($CFG->wwwroot, get_string('wwwrootmismatch', 'error', $CFG->wwwroot), 3);
}
}
// Check that URL is under $CFG->wwwroot.
if (strpos($rurl['path'], $wwwroot['path']) === 0) {
$SCRIPT = substr($rurl['path'], strlen($wwwroot['path'])-1);
} else {
// Probably some weird external script
$SCRIPT = $FULLSCRIPT = $FULLME = $ME = null;
return;
}
// $CFG->sslproxy specifies if external SSL appliance is used
// (That is, the Moodle server uses http, with an external box translating everything to https).
if (empty($CFG->sslproxy)) {
if ($rurl['scheme'] === 'http' and $wwwroot['scheme'] === 'https') {
if (defined('REQUIRE_CORRECT_ACCESS') && REQUIRE_CORRECT_ACCESS) {
print_error('sslonlyaccess', 'error');
} else {
redirect($CFG->wwwroot, get_string('wwwrootmismatch', 'error', $CFG->wwwroot), 3);
}
}
} else {
if ($wwwroot['scheme'] !== 'https') {
throw new coding_exception('Must use https address in wwwroot when ssl proxy enabled!');
}
$rurl['scheme'] = 'https'; // make moodle believe it runs on https, squid or something else it doing it
$_SERVER['HTTPS'] = 'on'; // Override $_SERVER to help external libraries with their HTTPS detection.
$_SERVER['SERVER_PORT'] = 443; // Assume default ssl port for the proxy.
}
// hopefully this will stop all those "clever" admins trying to set up moodle
// with two different addresses in intranet and Internet
if (!empty($CFG->reverseproxy) && $rurl['host'] === $wwwroot['host']) {
print_error('reverseproxyabused', 'error');
}
$hostandport = $rurl['scheme'] . '://' . $wwwroot['host'];
if (!empty($wwwroot['port'])) {
$hostandport .= ':'.$wwwroot['port'];
}
$FULLSCRIPT = $hostandport . $rurl['path'];
$FULLME = $hostandport . $rurl['fullpath'];
$ME = $rurl['fullpath'];
}
/**
* Initialises $FULLME and friends for command line scripts.
* This is a private method for use by initialise_fullme.
*/
function initialise_fullme_cli() {
global $CFG, $FULLME, $ME, $SCRIPT, $FULLSCRIPT;
// Urls do not make much sense in CLI scripts
$backtrace = debug_backtrace();
$topfile = array_pop($backtrace);
$topfile = realpath($topfile['file']);
$dirroot = realpath($CFG->dirroot);
if (strpos($topfile, $dirroot) !== 0) {
// Probably some weird external script
$SCRIPT = $FULLSCRIPT = $FULLME = $ME = null;
} else {
$relativefile = substr($topfile, strlen($dirroot));
$relativefile = str_replace('\\', '/', $relativefile); // Win fix
$SCRIPT = $FULLSCRIPT = $relativefile;
$FULLME = $ME = null;
}
}
/**
* Get the URL that PHP/the web server thinks it is serving. Private function
* used by initialise_fullme. In your code, use $PAGE->url, $SCRIPT, etc.
* @return array in the same format that parse_url returns, with the addition of
* a 'fullpath' element, which includes any slasharguments path.
*/
function setup_get_remote_url() {
$rurl = array();
if (isset($_SERVER['HTTP_HOST'])) {
list($rurl['host']) = explode(':', $_SERVER['HTTP_HOST']);
} else {
$rurl['host'] = null;
}
$rurl['port'] = $_SERVER['SERVER_PORT'];
$rurl['path'] = $_SERVER['SCRIPT_NAME']; // Script path without slash arguments
$rurl['scheme'] = (empty($_SERVER['HTTPS']) or $_SERVER['HTTPS'] === 'off' or $_SERVER['HTTPS'] === 'Off' or $_SERVER['HTTPS'] === 'OFF') ? 'http' : 'https';
if (stripos($_SERVER['SERVER_SOFTWARE'], 'apache') !== false) {
//Apache server
$rurl['fullpath'] = $_SERVER['REQUEST_URI'];
// Fixing a known issue with:
// - Apache versions lesser than 2.4.11
// - PHP deployed in Apache as PHP-FPM via mod_proxy_fcgi
// - PHP versions lesser than 5.6.3 and 5.5.18.
if (isset($_SERVER['PATH_INFO']) && (php_sapi_name() === 'fpm-fcgi') && isset($_SERVER['SCRIPT_NAME'])) {
$pathinfodec = rawurldecode($_SERVER['PATH_INFO']);
$lenneedle = strlen($pathinfodec);
// Checks whether SCRIPT_NAME ends with PATH_INFO, URL-decoded.
if (substr($_SERVER['SCRIPT_NAME'], -$lenneedle) === $pathinfodec) {
// This is the "Apache 2.4.10- running PHP-FPM via mod_proxy_fcgi" fingerprint,
// at least on CentOS 7 (Apache/2.4.6 PHP/5.4.16) and Ubuntu 14.04 (Apache/2.4.7 PHP/5.5.9)
// => SCRIPT_NAME contains 'slash arguments' data too, which is wrongly exposed via PATH_INFO as URL-encoded.
// Fix both $_SERVER['PATH_INFO'] and $_SERVER['SCRIPT_NAME'].
$lenhaystack = strlen($_SERVER['SCRIPT_NAME']);
$pos = $lenhaystack - $lenneedle;
// Here $pos is greater than 0 but let's double check it.
if ($pos > 0) {
$_SERVER['PATH_INFO'] = $pathinfodec;
$_SERVER['SCRIPT_NAME'] = substr($_SERVER['SCRIPT_NAME'], 0, $pos);
}
}
}
} else if (stripos($_SERVER['SERVER_SOFTWARE'], 'iis') !== false) {
//IIS - needs a lot of tweaking to make it work
$rurl['fullpath'] = $_SERVER['SCRIPT_NAME'];
// NOTE: we should ignore PATH_INFO because it is incorrectly encoded using 8bit filesystem legacy encoding in IIS.
// Since 2.0, we rely on IIS rewrite extensions like Helicon ISAPI_rewrite
// example rule: RewriteRule ^([^\?]+?\.php)(\/.+)$ $1\?file=$2 [QSA]
// OR
// we rely on a proper IIS 6.0+ configuration: the 'FastCGIUtf8ServerVariables' registry key.
if (isset($_SERVER['PATH_INFO']) and $_SERVER['PATH_INFO'] !== '') {
// Check that PATH_INFO works == must not contain the script name.
if (strpos($_SERVER['PATH_INFO'], $_SERVER['SCRIPT_NAME']) === false) {